JP2017073371A - Storage battery maintenance device and storage battery maintenance method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage battery maintenance device that is capable of reducing the amount of data used to maintain (manage) a storage battery and is capable of appropriately managing a deterioration state of the storage battery.SOLUTION: A storage battery maintenance device 1 comprises a data server 10 and a power storage system demand monitoring device 24. The power storage system demand monitoring device 24 comprise: a classification unit 241 that classifies a voltage of a cell 42A at the time of completion of charging into any of a plurality of predetermined voltage classifications set previously; a frequency acquisition unit 242 that, for each voltage classification, acquires a frequency of classification into the voltage classification with respect to each cell 42A; and a classification determination unit 243 that, on the basis of the frequency, determines a voltage classification to which each cell 42A belongs. The data server 10 comprises a deterioration determination unit 101 that, for each voltage classification, determines (defines) deterioration in a cell 42A determined to belong to the voltage classification. The deterioration determination unit 101 determines deterioration in a battery module 42 on the basis of a cell 42A that belongs to a voltage classification having the highest voltage value of the voltage classifications and has the largest frequency.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a storage battery maintenance device and a storage battery maintenance method.

  In recent years, as an effective means for achieving load leveling with the spread of renewable energy, a storage battery system as a distributed power source has been spreading. Deterioration of storage batteries used in such storage battery systems progresses as charging and discharging are repeated.

  Here, Patent Document 1 discloses a life prediction apparatus that predicts the life of a storage battery. More specifically, the life prediction apparatus includes a life prediction operation control unit that controls the operation of the power storage device, a data collection unit that collects measurement data of a plurality of operation conditions, calculates evaluation characteristics, and sequentially accumulates them. The data analysis unit creates a regression equation that shows the relationship between the evaluation characteristics and the operation time by curve fitting the accumulated evaluation data with an appropriate approximation function, and based on the regression equation, under any operating condition A life prediction formula creating unit that creates a life prediction formula for calculating a predicted value of the evaluation characteristic. And the deterioration degree of a storage battery can be estimated by referring the created lifetime prediction formula.

International Publication No. 2014/103705

  As described above, in the life prediction apparatus of Patent Document 1, evaluation characteristics are calculated based on measurement data of a plurality of operating conditions, and are sequentially stored in the data. Therefore, there is a possibility that the amount of data for performing life prediction becomes enormous. In particular, for example, many lithium-ion battery systems (assembled batteries) used for large power storage systems, electric vehicles, and the like are composed of a large number of single cells. For example, when trying to acquire (sample), store, and / or transmit measurement data such as voltage, current, temperature, etc. for each of the cells, the amount of data handled becomes enormous, and the storage capacity and communication of the storage There was a risk that the amount (communication charge) would be enormous.

  The present invention has been made to solve the above-mentioned problems, and is a storage battery maintenance device that can reduce the amount of data used for storage battery maintenance (management) and can accurately manage the deterioration state of the storage battery. And it aims at providing a storage battery maintenance method.

  The storage battery maintenance device according to the present invention includes a voltage detection unit that detects the voltage of each of the plurality of single cells constituting the assembled battery, and a predetermined number of voltages that are preset at a predetermined timing detected by the voltage detection unit. Classification means for classifying to which of the voltage classifications, a frequency acquisition means for acquiring the frequency classified into each voltage classification for each voltage classification, and a frequency acquisition means for each cell Classification determining means for determining a voltage classification to which each unit cell belongs based on the acquired frequency, and deterioration determination means for determining deterioration of the unit cell determined to belong to the voltage classification for each voltage classification. It is characterized by that.

  Further, the storage battery maintenance method according to the present invention includes a voltage detection step for detecting the voltage of each of the plurality of single cells constituting the assembled battery, and a plurality of voltages at a predetermined timing detected in the voltage detection step. A classification step for classifying which of the predetermined voltage classifications the unit belongs to, a frequency acquisition step for acquiring the frequency classified into each voltage classification for each voltage classification, and a frequency acquisition for each unit cell A step of determining a voltage classification to which each unit cell belongs, based on the frequency obtained in the step, and a step of determining a deterioration for each voltage category to determine the deterioration of the unit cell determined to belong to the voltage group; It is characterized by providing.

  According to the storage battery maintenance device or the storage battery maintenance method according to the present invention, the voltage at a predetermined timing is classified as belonging to a predetermined voltage classification among a plurality of predetermined voltage classifications, The frequency classified into each voltage category is acquired for each voltage category, and the voltage category to which each single cell belongs is determined based on the acquired frequency. For each voltage category, the deterioration of the cell determined to belong to the voltage category is determined. Therefore, it is not necessary to store all the measurement data, and the deterioration of the single cells belonging to the voltage classification can be comprehensively determined for each voltage classification. As a result, the amount of data used for storage battery maintenance (management) can be reduced, and the deterioration state of the storage battery can be managed appropriately.

  In the storage battery maintenance device according to the present invention, the deterioration determination means may determine the deterioration of the assembled battery based on the single cell having the highest voltage value and the highest frequency value among the voltage categories. preferable.

  In the storage battery maintenance method according to the present invention, in the deterioration determination step, the deterioration of the assembled battery is determined based on the single cell belonging to the highest voltage value among the voltage categories and having the highest frequency. It is preferable.

  By the way, normally, deterioration of a storage battery accelerates, so that it becomes high electric potential. Here, according to the storage battery maintenance device or the storage battery maintenance method according to the present invention, the deterioration of the assembled battery is caused on the basis of the unit cell belonging to the highest voltage value among the voltage categories and having the highest frequency. Determined. That is, the deterioration of the assembled battery can be determined by representing the single cell that is estimated to be most deteriorated. As a result, the amount of data used for maintenance (management) of the storage battery (assembled battery) can be reduced, and the deterioration state of the storage battery can be managed accurately.

  In the storage battery maintenance apparatus according to the present invention, it is preferable that the classifying unit classifies which of a plurality of predetermined voltage categories the voltage at the completion of charging belongs to.

  In this case, it is classified whether the voltage at the completion of charging belongs to a predetermined voltage category set in advance. Therefore, it is possible to comprehensively determine the deterioration of the cells belonging to the voltage classification for each voltage classification when the charging is completed. Further, the deterioration of the assembled battery can be determined by representing the single cell that is estimated to be most deteriorated.

  In the storage battery maintenance device according to the present invention, a plurality of voltage detection means for detecting the voltage of each of the plurality of single cells constituting the assembled battery, and a plurality of integral values of the voltage in a predetermined period detected by the voltage detection means are set in advance. Classification means for categorizing which of the predetermined integral value categories belongs, and deterioration determining means for judging deterioration of the single cell belonging to the integral value category for each integral value category. And

  Further, the storage battery maintenance method according to the present invention includes a voltage detection step for detecting the voltage of each of the plurality of single cells constituting the assembled battery, and a plurality of integral values of the voltage in a predetermined period detected in the voltage detection step in advance. A classification step for classifying which of the predetermined integral value categories that are set belongs, and a deterioration determination step for determining deterioration of the single cell belonging to the integral value category for each integral value category It is characterized by.

  According to the storage battery maintenance device or the storage battery maintenance method according to the present invention, a classification is made as to which of a plurality of predetermined integral value categories a voltage integral value in a predetermined period (section) belongs to. For each integral value section, the deterioration of the cells belonging to the integral value section is determined. Therefore, it is possible to integrally determine the deterioration of the cells belonging to the integral value section for each integral value section. As a result, the amount of data used for storage battery maintenance (management) can be reduced, and the deterioration state of the storage battery can be managed appropriately.

  In the storage battery maintenance device according to the present invention, the deterioration determination means determines the deterioration of the assembled battery based on a single cell belonging to the integral value section having the largest integral value among the integral value sections and having the largest integral value. It is preferable to do.

  Further, in the storage battery maintenance method according to the present invention, in the deterioration determination step, the deterioration of the assembled battery based on the single cell belonging to the integral value section having the largest integral value and having the largest integral value among the integral value sections. Is preferably determined.

  By the way, the deterioration of the storage battery is usually accelerated as the electric potential is kept at a high potential for a long time. Here, according to the storage battery maintenance device or the storage battery maintenance method according to the present invention, an assembled battery based on a single cell belonging to the integral value section having the largest integral value and having the largest integral value among the integral value sections. Degradation of the is determined. That is, the deterioration of the assembled battery can be determined by representing the single cell that is estimated to be most deteriorated. As a result, the amount of data used for maintenance (management) of the storage battery (assembled battery) can be reduced, and the deterioration state of the storage battery can be managed accurately.

  The storage battery maintenance device according to the present invention includes a temperature detection device that detects the temperature of an assembled battery or a single cell, and a predetermined temperature section in which a plurality of temperatures at a predetermined timing detected by the temperature detection means are set in advance. Classification means for classifying to which category, frequency acquisition means for acquiring the frequency classified for each temperature category for each cell, and frequency acquired by the frequency acquisition means And a deterioration determining means for determining the deterioration of the single cell determined to belong to the temperature section for each temperature section. .

  The storage battery maintenance method according to the present invention includes a temperature detection step for detecting the temperature of an assembled battery or a single cell, and a predetermined temperature section in which a plurality of temperatures at a predetermined timing detected by the temperature detection means are preset. Obtained in the frequency acquisition step and the frequency acquisition step for acquiring the frequency classified in each temperature category for each temperature category for each cell. A classification determination step for determining a temperature classification to which each unit cell belongs based on the frequency; and a deterioration determination step for determining degradation of the unit cell determined to belong to the temperature classification for each temperature classification. And

  According to the storage battery maintenance device or the storage battery maintenance method according to the present invention, the temperature at a predetermined timing is classified as to which of a plurality of predetermined temperature categories that are set in advance, and for each single cell, For each temperature category, the frequency classified into each temperature category is acquired, and the temperature category to which each single cell belongs is determined based on the acquired frequency. Then, for each temperature category, the deterioration of the cell determined to belong to the temperature category is determined. Therefore, it is possible to comprehensively determine the deterioration of the cells belonging to the temperature category for each temperature category. As a result, the amount of data used for storage battery maintenance (management) can be reduced, and the deterioration state of the storage battery can be managed appropriately.

  In the storage battery maintenance device according to the present invention, it is preferable that the deterioration determination means determines the deterioration of the assembled battery based on a single cell belonging to the highest temperature section and having the highest frequency among the temperature sections.

  Further, in the storage battery maintenance method according to the present invention, in the deterioration determination step, the deterioration of the assembled battery can be determined based on the single cell belonging to the highest temperature section and having the highest frequency among the temperature sections. preferable.

  By the way, the deterioration of the storage battery usually accelerates as the temperature rises. Here, according to the storage battery maintenance device or the storage battery maintenance method according to the present invention, the deterioration of the assembled battery is determined based on the single cell belonging to the highest temperature category and having the highest frequency among the temperature categories. Is done. That is, the deterioration of the assembled battery can be determined by representing the single cell that is estimated to be most deteriorated. As a result, the amount of data used for maintenance (management) of the storage battery (assembled battery) can be reduced, and the deterioration state of the storage battery can be managed accurately.

  In the storage battery maintenance device according to the present invention, it is preferable that the deterioration determination means determines the deterioration of the assembled battery based on the single cell belonging to the lowest temperature category and having the highest frequency among the temperature categories.

  Further, in the storage battery maintenance method according to the present invention, in the deterioration determination step, the deterioration of the assembled battery can be determined based on the single cell belonging to the lowest temperature section and having the highest frequency among the temperature sections. preferable.

  By the way, normally, when the temperature of the storage battery is lower during low-temperature charging, the abnormal deterioration proceeds (for example, the generation of lithium dendrite is promoted). Here, according to the storage battery maintenance device or the storage battery maintenance method of the present invention, the deterioration of the assembled battery is determined based on the unit cell belonging to the lowest temperature category and having the highest frequency among the temperature categories. Is done. That is, the abnormal deterioration of the assembled battery (for example, generation of lithium dendrite) can be determined by representing one single battery that is estimated to have the most abnormal deterioration. As a result, the amount of data used for maintenance (management) can be reduced, and the deterioration state of the storage battery (assembled battery) can be managed appropriately.

  According to the present invention, the amount of data used for storage battery maintenance (management) can be reduced, and the deterioration state of the storage battery (the assembled battery and the single battery constituting the assembled battery) can be managed accurately.

It is a block diagram which shows the structure of the storage battery maintenance apparatus which concerns on 1st Embodiment, and EMS to which this storage battery maintenance apparatus was applied. It is a block diagram of the electrical storage system which comprises EMS. It is a block diagram of the battery module which comprises an electrical storage system. It is a figure which shows an example when the voltage at the time of completion of charge of a cell is classified for every voltage classification. It is a flowchart which shows the process sequence of the storage battery maintenance process by the storage battery maintenance apparatus which concerns on 1st Embodiment. It is a block diagram which shows the structure of the storage battery maintenance apparatus which concerns on 2nd Embodiment, and EMS to which this storage battery maintenance apparatus was applied. It is a block diagram which shows the structure of the storage battery maintenance apparatus which concerns on 3rd Embodiment, and EMS to which this storage battery maintenance apparatus was applied. It is a block diagram which shows the structure of the storage battery maintenance apparatus which concerns on 4th Embodiment, and EMS to which this storage battery maintenance apparatus was applied.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals are used for the same or corresponding parts. Moreover, in each figure, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted.

(First embodiment)
First, the configuration of the storage battery maintenance device 1 according to the first embodiment will be described with reference to FIGS. FIG. 1 is a block diagram illustrating a configuration of a storage battery maintenance device 1 and an EMS (Energy Management System) 20 to which the storage battery maintenance device 1 is applied. Here, a case where the storage battery maintenance device 1 is applied to an EMS 20 owned by a power consumer of a high-voltage power receiving contract such as an office or a factory will be described as an example.

  The storage battery maintenance device 1 mainly includes a data server 10, a power storage system demand monitoring device 24, and a power storage system 26. The data server 10 is installed in the maintenance center, and manages the power storage system 26 and the demand in the plurality of EMSs 20 and 20. The data server 10 includes a CPU that performs arithmetic processing, an HDD and a ROM that store programs executed by the CPU, a RAM that temporarily stores data, a communication interface that transmits and receives data to and from the EMS 20, and the like. Has been.

  In managing the power storage system 26, the data server 10 (maintenance center) performs data reception, analysis / state analysis, creation of a database, notification of state information, reception of an abnormal alarm, response to the alarm, and the like regarding the power storage system 26. In demand management, data related to demand is received, analyzed and demand is predicted, management parameters are generated, control values are transmitted and received, alarms are received, and alarms are dealt with.

  Further, the data server 10 (maintenance center) creates a database of demand power / environment information, battery information, etc. collected by the EMS 20, and a storage battery (lithium ion battery) or a deterioration state of each device determined based on the information in the database. Predict and monitor abnormal conditions. Further, the information is transmitted to the demand control device 25 in the EMS 20 to display the state to the consumer of the EMS 20, and the remote operation of each device, the transmission of an emergency stop signal, and the determination of the maintenance dispatch are performed as necessary.

  The EMS 20 includes a high-voltage power receiving facility 21, a photovoltaic power generation facility 22, and facility equipment 23. The EMS 20 includes a power storage system demand monitoring device 24, a demand control device 25, and a power storage system 26. In addition, a 6.6 kV system wiring L is connected to the high-voltage power receiving equipment 21.

  The high-voltage power receiving facility 21 is installed on the premises of the consumer who owns the EMS 20, receives electricity supplied from the system wiring L, and steps down the voltage to be supplied to the facility equipment 23. The solar power generation facility 22 includes a solar battery and a power conditioner. In the photovoltaic power generation facility 22, the DC power generated by the solar cell is converted into AC power by a power conditioner, and connected to a three-phase 200 V (or single-phase 200 V) distribution system to supply power to the equipment 23. The equipment 23 is lighting such as air conditioning, ventilation equipment, machine tools, elevators, or OA equipment in a customer's building. These equipment 23 is provided with a state detection sensor for detecting a state such as temperature and power consumption, a control device for operating the equipment, and the like.

  The power storage system demand monitoring device 24 includes a communication interface. For example, the battery state of the power storage system 26 and state monitoring data of the high-voltage power receiving equipment 21 and the equipment 23 are collected and transmitted to the data server 10 of the maintenance center. To do. In addition, information transmitted from the data server 10 is received and transmitted to the demand control device 25.

  The demand control device 25 performs control based on an algorithm incorporated so as to achieve optimum operation of charging / discharging of each equipment device 23 and the power storage system 26. The demand control device 25 includes an interface with a state detection sensor and a control device of the equipment 23 to be controlled. Furthermore, an interface with the power storage system 26 and the power storage system demand monitoring device 24 is provided. The demand control device 25 realizes energy saving, load standardization, and peak cut in the consumer.

  As shown in FIG. 2, the power storage system 26 includes a battery pack 31. A control power source 32, an integrated ECU (Energy Control Unit) 33, and a junction circuit 34 are connected to the battery pack 31. An inverter 35 is connected to the junction circuit 34.

  The battery pack 31 includes a BMU (Battery Management Unit) 41 and a plurality of battery modules 42 (corresponding to the assembled battery described in the claims). A safety plug 43 is interposed between the battery modules 42. The battery pack 31 is provided with a cooling system 44 for cooling the battery pack 31. As the cooling system 44, either an air-cooled type or a water-cooled type can be used.

  As shown in FIG. 3, the battery module 42 includes a plurality of cells (unit cells: lithium ion batteries) 42 </ b> A and 42 </ b> A. In each cell 42A, a voltage sensor 51 (corresponding to the voltage detecting means described in the claims) for detecting the voltage of the cell 42 and a temperature sensor 53 (detecting the temperature of the cell 42) are provided. (Corresponding to the temperature detecting means described in 1). In addition, the battery module 42 includes a current sensor 52 that detects a current value flowing through the system (battery module 42). The voltage sensor 51, the current sensor 52, and the temperature sensor 53 are connected to the BMU 41.

  The BMU 41 reads the voltage value detected by the voltage sensor 51, the current value detected by the current sensor 52, and the temperature detected by the temperature sensor 53 in a predetermined cycle, for example, a cycle of 50 to 100 msec. A signal such as permission / stop is output to the integrated ECU 33. The integrated ECU 33 controls the junction circuit 34 (inverter 35) based on the signal output from the BMU 41.

  Further, the integrated ECU 33 transmits information such as the voltage value, the current value, and the temperature to the power storage system demand monitoring device 24. The power storage system demand monitoring device 24 transmits the transmitted information to the data server 10 after classifying and classifying the information for each voltage classification, for example. Details will be described later. The data server 10 determines whether or not the battery module 42 (cell 42A) included in the power storage system 26 is deteriorated based on the received classification / classification information for each voltage classification. In the present embodiment, whether or not the battery module 42 (cell 42A) is deteriorated is determined by the data server 10 of the maintenance center. For example, the determination is performed by the power storage system demand monitoring device 24 in the EMS 20 or the like. It can also be done.

  In particular, the power storage system demand monitoring device 24 and the data server 10 can reduce the amount of data used for maintenance (management) of the battery module 42 (cell 42A) and accurately manage the deterioration state of the battery module 42 (cell 42A). It has a function to do. Therefore, the power storage system demand monitoring device 24 functionally includes a classification unit 241, a frequency acquisition unit 242, and a classification determination unit 243. Further, the data server 10 functionally includes a deterioration determination unit 101. In the power storage system demand monitoring device 24, for example, each function of the classification unit 241, the frequency acquisition unit 242, and the classification determination unit 243 is realized by a CPU executing a program stored in an HDD or the like. Similarly, in the data server 10, for example, the function of the degradation determination unit 101 is realized by executing a program stored in an HDD or the like by the CPU.

  The classifying unit 241 belongs to any of a predetermined voltage category (management category) (hereinafter, also simply referred to as “category”) in which a plurality of voltages at a predetermined timing detected by the voltage sensor 51 are set in advance. Classify. More specifically, the classifying unit 241 classifies, for example, which of a plurality of predetermined voltage categories the voltage at the completion of charging belongs to (see, for example, FIG. 4). That is, the classification unit 241 functions as a classification unit described in the claims.

  Here, for example, in the battery module 42 (assembled battery) in which the ID (for example, 1 to n) is assigned to each cell 42A (single battery), when the cell voltage defined as full charge is 4.050 (V), When the voltage value is reached, charging of the battery module 42 is completed, and current application is stopped, but the cell 42A that reaches the voltage is one (or several) cells 42A.

  Therefore, as shown in FIG. 4, the charging completion voltage is set to, for example, four voltage sections A to D, that is, a section A of 4.050 (V) or higher, less than 4.050 (V), 4.040 (V ) The above category B, less than 4.040 (V) 4.00 (V) or more category C, less than 4.030 (V) 4.020 (V) or more category D.

  In this embodiment, the classification is managed by classifying into four categories (groups) of A to D every 10 mV. For example, depending on the quality variation of the target cell 42A (single cell), for example, the classification is performed every 20 mV. (Grouping) may be performed. Alternatively, the number (range) of divisions may be increased to be 5 divisions (groups) or more. The results classified by the classification unit 241 are output to the frequency acquisition unit 242.

  For example, when the charging (charging / discharging) is performed a plurality of times, the frequency acquisition unit 242 classifies the cell 42A (single cell) into each voltage classification A to D for each voltage classification A to D. Get the frequency (number of times) done. That is, the frequency acquisition unit 242 functions as a frequency acquisition unit described in the claims. The frequency (number of times) of each of the cells 42A classified into the voltage classifications A to D acquired by the frequency acquisition unit 242 is output to the classification determination unit 243.

  The classification determination unit 243 determines the voltage classification to which each cell 42A (single cell) belongs based on the frequency acquired by the frequency acquisition unit 242. More specifically, the segment determination unit 243 determines, for each cell 42A, the voltage segment having the highest frequency as the segment (voltage segment) to which the cell 42A belongs. That is, the classification determination unit 243 functions as a classification determination unit described in the claims.

  Here, for example, when the charging is performed 1000 times, the voltage when the charging of a certain cell 42A is 4.050V (section A) is 800 times, and is 4.040 or more and less than 4.050 ( If the number of times in section B) is 200, this cell 42A is classified into a section of 4.050V (that is, section A). Information such as the classification to which each cell 42 </ b> A determined by the classification determination unit 243 belongs and its frequency is output to the deterioration determination unit 101.

  The degradation determination unit 101 determines (defines) the degradation of the cell 42A determined to belong to the voltage classifications A to D for each of the voltage classifications A to D. Moreover, the deterioration determination part 101 determines deterioration of the battery module 42 based on the cell 42A which belongs to the voltage section A with the highest voltage value among the voltage sections A to D and has the highest frequency. That is, the deterioration determination unit 101 functions as a deterioration determination unit described in the claims.

  Here, the charge completion voltage is expressed by open terminal voltage + current × internal resistance value in relation to the internal resistance value specific to each cell 42A, and almost all the cells 42A have the same charge completion voltage. From the initial stage, the charge completion voltage of each cell 42A can be classified into the above-mentioned categories A to D, and by defining the lifetime of four categories (groups), the lifetime can be handled without handling all the cell (single cell) data. (That is, the degree of deterioration) can be determined and managed.

  At that time, the life determination and life estimation of the battery module 42 (power storage system) can be defined only by the single cells of the category A, and the categories B, C, and D are the representative cells 42A (single cells). Can be defined as The life determination and life estimation of the category A can be calculated from, for example, the ratio of the drooping characteristic of the capacity (Wh) at the completion of charging acquired from the initial state to the initial state. Sections B, C, and D define the capacity by estimating the time required to reach the charge completion voltage value (4.050 (V)) from the charge state data of the representative cell 42A in the section, Life determination and life estimation can be performed without handling state information data of a huge number of individual cells 42A.

  In addition, since the temperature of each cell 42A (single cell) during charging affects the internal resistance of the cell 42A, it is preferable to set a correction coefficient for each temperature in advance.

  Next, the operation of the storage battery maintenance device 1 will be described with reference to FIG. Here, FIG. 5 is a flowchart showing a processing procedure of the storage battery maintenance process by the storage battery maintenance device 1. This process is mainly repeatedly executed at a predetermined timing in the power storage system demand monitoring device 24 and the data server 10.

  In step S100 (voltage detection step), the voltage of each of the plurality of cells 42A (single cell) constituting the battery module 42 (assembled battery) is detected and read.

  Subsequently, in step S102 (classification step), the voltage at the predetermined timing (for example, when charging is completed) detected in step S100 is assigned to any one of predetermined voltage categories A to D set in advance. Whether it belongs is classified. Since the classification method is the same as described above, detailed description is omitted here.

  In the following step S104 (frequency acquisition step), the frequency classified into each voltage classification A to D is acquired for each voltage classification A to D for each cell 42A (single cell).

  Next, in step S106 (segment determination step), the voltage segment to which each cell 42A belongs is determined based on the frequency acquired in step S104. Since the method of determining the voltage classification is as described above, detailed description thereof is omitted here.

  In step S108 (degradation determination step), for each voltage category A to D, the degradation of the cell 42A determined to belong to the voltage category A to D (particularly category A) is determined (defined). Further, in step S108, the deterioration of the battery module 42 is determined based on the cell 42A belonging to the voltage section A having the highest voltage value among the voltage sections A to D and having the highest frequency. In addition, since the deterioration determination (definition) of the cell 42A and the deterioration determination method of the battery module 42 are as described above, detailed description thereof is omitted here.

  As described above in detail, according to the present embodiment, the cell 42A (single cell) is classified according to which of a plurality of predetermined voltage categories the voltage at the completion of charging belongs to. ) For each voltage category, the frequency classified into each voltage category is acquired, and based on the acquired frequency, the voltage category to which each cell 42A belongs is determined. Then, for each voltage category at the completion of charging, the deterioration of the cell 42A determined to belong to the voltage category is determined. Therefore, it is not necessary to store all the measurement data, and the deterioration of the cells 42A belonging to the voltage section can be determined for each voltage section in an integrated manner. As a result, the amount of data used for maintenance (management) of the battery module 42 and each cell 42A can be reduced, and the deterioration state of the battery module 42 and each cell 42A can be managed appropriately.

  Further, according to the present embodiment, the battery module 42 (assembled battery) is based on the cell 42A (single cell) that belongs to the highest voltage value among the voltage categories and has the largest frequency (number of times). Deterioration is determined. That is, the deterioration of the battery module 42 can be determined by representing one cell 42A that is estimated to be the most advanced. As a result, the amount of data used for maintenance (management) of the battery module 42 can be reduced, and the deterioration state of the battery module 42 can be managed accurately.

(Second Embodiment)
By the way, the deterioration of a storage battery (lithium ion battery) usually accelerates as it is placed in a high potential state for a long time. Therefore, in the first embodiment described above, the cells 42A are classified (grouped) by the voltage value at the time of completion of charging, but the integrated value of the voltage (voltage × time, that is, the time during which the cell is placed in the high potential state) You may make it classify (group) according to it.

  Then, next, the structure of the storage battery maintenance apparatus 1B which concerns on 2nd Embodiment is demonstrated using FIG. Here, description is simplified or abbreviate | omitted about the structure similar to the storage battery maintenance apparatus 1 which concerns on 1st Embodiment mentioned above, or a difference is mainly demonstrated. FIG. 6 is a block diagram showing the configuration of the storage battery maintenance device 1B according to the second embodiment and the EMS 20B to which the storage battery maintenance device 1B is applied. In FIG. 6, the same or equivalent components as those in the first embodiment are denoted by the same reference numerals.

  The storage battery maintenance device 1B is different from the above-described storage battery maintenance device 1 in that it includes an EMS 20B instead of the EMS 20 and a data server 10B instead of the data server 10. The EMS 20B includes a power storage system demand monitoring device 24B instead of the power storage system demand monitoring device 24. The power storage system demand monitoring device 24B includes a classification unit 241B instead of the classification unit 241, and The power storage system demand monitoring device 24 is different from the power storage system demand monitoring device 24 described above in that the frequency acquisition unit 242 and the classification determination unit 243 are not provided. The data server 10B is different from the data server 10 described above in that it includes a deterioration determination unit 101B instead of the deterioration determination unit 101. Other configurations are the same as or similar to those of the storage battery maintenance device 1 described above, and thus detailed description thereof is omitted here.

  The classifying unit 241B classifies to which of a plurality of predetermined integral value sections the voltage integral values in a predetermined period (section) detected by the voltage sensor 51 belong. More specifically, the classifying unit 241 classifies, for example, to which of a plurality of predetermined integrated value categories a voltage integral value of a predetermined period after completion of charging belongs. That is, the classification unit 241B functions as a classification unit described in the claims. Note that the result of classification by the classification unit 241B is output to the deterioration determination unit 101B.

  The degradation determination unit 101B determines (defines) the degradation of the cell 42A (single cell) belonging to the integral value section for each integral value section. Further, the deterioration determination unit 101B determines the deterioration of the battery module 42 (assembled battery) based on the single cell belonging to the integral value section having the largest integral value and having the largest integral value among the integral value sections. That is, the deterioration determination unit 101 functions as a deterioration determination unit described in the claims. In addition, since the deterioration determination (definition) of the cell 42A and the deterioration determination method of the battery module 42 are as described above, detailed description thereof is omitted here.

  According to the present embodiment, which of the predetermined integral value sections set in advance belongs to which of the plurality of predetermined integral values of the voltage in the detected predetermined period (for example, the predetermined period after completion of charging). For each integrated value section, the deterioration of the cell 42A (single cell) belonging to the integrated value section is determined. Therefore, the deterioration of the cells 42A belonging to the integral value section can be determined in an integrated manner for each integral value section. As a result, the amount of data used for maintenance (management) of the battery module 42 and each cell 42A can be reduced, and the deterioration state of the battery module 42 and each cell 42A can be managed appropriately.

  Further, according to the present embodiment, the deterioration of the assembled battery is determined based on the unit cell that belongs to the integral value section having the largest integral value among the integral value sections and has the largest integral value. That is, the deterioration of the battery module 42 (assembled battery) can be determined by representing the single cell 42A (single battery) that is estimated to be most deteriorated. As a result, the amount of data used for maintenance (management) of the battery module 42 can be reduced, and the deterioration state of the battery module 42 can be managed accurately.

(Third embodiment)
By the way, normally, a storage battery (lithium ion battery) progresses as the temperature increases. Thus, in the first embodiment described above, the cells 42A are classified (grouped) by the voltage value at the completion of charging, but may be configured (grouped) according to the temperature (high temperature side).

  Then, next, the structure of the storage battery maintenance apparatus 1C which concerns on 3rd Embodiment is demonstrated using FIG. Here, description is simplified or abbreviate | omitted about the structure similar to the storage battery maintenance apparatus 1 which concerns on 1st Embodiment mentioned above, or a difference is mainly demonstrated. FIG. 7 is a block diagram showing the configuration of the storage battery maintenance device 1C according to the third embodiment and the EMS 20C to which the storage battery maintenance device 1C is applied. In FIG. 7, the same or equivalent components as those in the first embodiment are denoted by the same reference numerals.

  The storage battery maintenance device 1 </ b> C is different from the storage battery maintenance device 1 described above in that it includes an EMS 20 </ b> C instead of the EMS 20 and a data server 10 </ b> C instead of the data server 10. The EMS 20C includes a power storage system demand monitoring device 24C instead of the power storage system demand monitoring device 24. The power storage system demand monitoring device 24C is replaced with a classification unit 241, a frequency acquisition unit 242, and a segment determination unit 243. It differs from the power storage system demand monitoring device 24 described above in that it has a classification unit 241C, a frequency acquisition unit 242C, and a classification determination unit 243C. The data server 10C is different from the data server 10 described above in that it includes a deterioration determination unit 101C instead of the deterioration determination unit 101. Other configurations are the same as or similar to those of the storage battery maintenance device 1 described above, and thus detailed description thereof is omitted here.

  The classification unit 241C classifies which of a plurality of predetermined temperature segments (high-temperature side management categories) the temperatures at a predetermined timing detected by the temperature sensor 53 belong to. More specifically, the classifying unit 241C, for example, has a predetermined temperature classification in which a plurality of temperatures at the time of completion of charging are set in advance (for example, 40 ° C. or more, less than 40 ° C., 38 ° C. or more, less than 38 ° C., 36 ° C. or more , Less than 36 ° C., 34 ° C. or more, etc.). That is, the classification unit 241C functions as classification means described in the claims. The result classified by the classification unit 241C is output to the frequency acquisition unit 242C.

  The frequency acquisition unit 242C acquires the frequency (number of times) classified into each temperature segment for each temperature segment for each cell 42A (single cell). That is, the frequency acquisition unit 242C functions as a frequency acquisition unit described in the claims. The frequency acquired by the frequency acquisition unit 242C is output to the classification determination unit 243C.

  The division determination unit 243C determines the temperature division to which each cell 42A (single cell) belongs based on the frequency acquired by the frequency acquisition unit 242C. More specifically, the division determining unit 243C determines, for each cell 42A, the temperature division having the highest frequency as the division (temperature division) to which the cell 42A belongs. That is, the classification determining unit 243C functions as the classification determining means described in the claims. Since the method for determining the classification is as described above, detailed description thereof is omitted here. Information such as the classification to which each cell 42A determined by the classification determination unit 243C belongs and its frequency is output to the degradation determination unit 101C.

  The degradation determination unit 101C determines (defines) the degradation of the cell 42A determined to belong to the temperature segment for each temperature segment. In addition, the deterioration determination unit 101C determines the deterioration of the battery module 42 (assembled battery) based on the cell 42A that belongs to the highest temperature section among the temperature sections and has the highest frequency. That is, the deterioration determination unit 101C functions as a deterioration determination unit described in the claims. Note that the method for determining the deterioration of the cell 42A and the method for determining the deterioration of the battery module 42 are as described above, and a detailed description thereof will be omitted here.

  According to the present embodiment, the temperature at a predetermined timing (for example, when charging is completed) is classified as to which of a plurality of preset predetermined temperature categories, and each cell 42A (single cell) is classified. For each temperature segment, the frequency (number of times) classified into each temperature segment is acquired, and the temperature segment of each cell 42A is determined based on the acquired frequency. Then, the deterioration of the cell 42A determined to belong to the temperature section is determined for each temperature section. Therefore, it is possible to comprehensively determine the deterioration of the cell 42A belonging to the temperature section for each temperature section. As a result, the amount of data used for maintenance (management) of the battery module 42 and each cell 42A can be reduced, and the deterioration state of the battery module 42 and each cell 42A can be managed appropriately.

  Further, according to the present embodiment, the deterioration of the battery module 42 (assembled battery) is determined based on the single cell that belongs to the highest temperature category and has the highest frequency among the temperature categories. That is, the deterioration of the battery module 42 can be determined by representing one cell 42A that is estimated to be the most advanced. As a result, the amount of data used for maintenance (management) of the battery module 42 can be reduced, and the deterioration state of the battery module 42 can be managed accurately.

(Fourth embodiment)
By the way, normally, a storage battery (lithium ion battery) progresses abnormally as the temperature of the storage battery during charging decreases (for example, the generation of lithium dendrite is promoted). Therefore, in the first embodiment described above, the cells 42A are classified (grouped) according to the voltage value at the completion of charging, but are classified (grouped) according to the temperature (low temperature side (for example, 15 ° C. or lower)). It is good also as a structure.

  Then, next, the structure of storage battery maintenance apparatus 1D which concerns on 4th Embodiment is demonstrated using FIG. Here, description is simplified or abbreviate | omitted about the same and similar structure as the storage battery maintenance apparatus 3 which concerns on 3rd Embodiment mentioned above, and a different point is mainly demonstrated. FIG. 8 is a block diagram showing the configuration of the storage battery maintenance device 1D according to the fourth embodiment and the EMS 20D to which the storage battery maintenance device 1D is applied. In FIG. 8, the same or equivalent components as those in the third embodiment are denoted by the same reference numerals.

  The storage battery maintenance device 1D is different from the storage battery maintenance device 3 described above in that it includes an EMS 20D instead of the EMS 20C and a data server 10D instead of the data server 10C. The EMS 20D includes a power storage system demand monitoring device 24D instead of the power storage system demand monitoring device 24C, and the power storage system demand monitoring device 24D includes the classification unit 241D instead of the classification unit 241C. This is different from the electricity storage system demand monitoring device 24. The data server 10D is different from the data server 10C described above in that it includes a deterioration determination unit 101D instead of the deterioration determination unit 101C. Other configurations are the same as or similar to those of the storage battery maintenance device 3 described above, and thus detailed description thereof is omitted here.

  The classification unit 241D classifies which of a plurality of predetermined temperature segments (low-temperature side management categories) the temperatures at a predetermined timing detected by the temperature sensor 53 belong to. More specifically, the classification unit 241D has, for example, a predetermined temperature category (for example, less than 15 ° C., 15 ° C. or more and less than 17 ° C., 17 ° C. or more and less than 19 ° C.) in which multiple temperatures are set in advance. , 19 ° C. or more and less than 21 ° C.).

  The degradation determination unit 101D determines (defines) the degradation of the cell 42A (single cell) determined to belong to the temperature segment for each temperature segment. In addition, the deterioration determining unit 101D performs abnormal deterioration (lithium ion dendrite) of the battery module 42 (assembled battery) based on the cell 42A that belongs to the lowest temperature category and has the highest frequency (number of times). Is determined).

  According to the present embodiment, the deterioration of the battery module 42 (assembled battery) is determined based on the cell 42A (single cell) belonging to the lowest temperature section and having the highest frequency (number of times) among the temperature sections. Is done. That is, the abnormal deterioration (generation of lithium dendrite) of the battery module 42 can be determined by representatively using one cell 42A that is estimated to have the most abnormal deterioration. As a result, the amount of data used for maintenance (management) can be reduced, and the deterioration state of the battery module 42A can be managed appropriately.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above-described embodiment, the present invention is applied to the battery module 42 used in the EMS 20, but may be applied to, for example, a battery module mounted on an electric vehicle or a hybrid vehicle.

  Further, the function sharing between the data server 10 of the maintenance center and the power storage system demand monitoring device 24 configuring the EMS 20 is not limited to the above embodiment, and may be arbitrarily changed according to required requirements, costs, and the like.

  Moreover, in the said embodiment, although temperature is detected for every cell 42A, you may detect temperature for every battery module 42. FIG.

  In the above embodiment, the division with the highest frequency is determined as the division to which the cell 42A (single cell) belongs. However, for example, the division may be determined according to a product of the voltage value (division) and the frequency.

  In addition, although the storage battery maintenance device / maintenance method according to the first to fourth embodiments described above can be used alone, they may be used in combination with each other.

1, 1B, 1C, 1D Storage battery maintenance device 10, 10B, 10C, 10D Data server 101, 101B, 101C, 101D Degradation determination unit 20, 20B, 20C, 20D EMS
21 High Voltage Power Receiving Equipment 22 Solar Power Generation Equipment 23 Equipment 24, 24B, 24C, 24D Storage System Demand Monitoring Devices 241, 241B, 241C, 241D Classification Unit 242, 242C Frequency Acquisition Unit 243, 243C Classification Determination Unit 25 Demand Control Device 26 Power storage system 31 Battery pack 32 Control power supply 33 Integrated ECU
34 Junction circuit 35 Inverter 41 BMU
42 battery module 42A cell 43 safety plug 44 cooling system 51 voltage sensor 52 current sensor 53 temperature sensor

Claims (15)

Voltage detection means for detecting the voltage of each of the plurality of single cells constituting the assembled battery;
Classification means for classifying which of a plurality of predetermined voltage classifications the voltage at a predetermined timing detected by the voltage detection means belongs;
For each unit cell, for each voltage classification, frequency acquisition means for acquiring the frequency classified into the voltage classification;
Based on the frequency acquired by the frequency acquisition unit, a category determination unit that determines a voltage category to which each unit cell belongs;
A storage battery maintenance apparatus comprising: a deterioration determination unit that determines deterioration of a single cell determined to belong to the voltage classification for each voltage classification.   2. The deterioration determination unit determines deterioration of the assembled battery based on a single battery belonging to a voltage section having the highest voltage value and having the highest frequency among the voltage sections. The storage battery maintenance apparatus as described in.   3. The storage battery maintenance device according to claim 1, wherein the classifying unit classifies which of a plurality of predetermined voltage categories a voltage at completion of charging belongs to. Voltage detection means for detecting the voltage of each of the plurality of single cells constituting the assembled battery;
A classifying unit for classifying which of a plurality of predetermined integral value categories a predetermined integral value of the voltage detected by the voltage detection unit belongs to;
A storage battery maintenance apparatus comprising: a deterioration determination unit that determines deterioration of a single cell belonging to the integral value section for each integral value section.   The deterioration determining means determines deterioration of the assembled battery based on a single cell belonging to an integral value section having the largest integral value and having the largest integral value among the integral value sections. Item 5. The storage battery maintenance device according to Item 4. A temperature detecting device for detecting the temperature of the assembled battery or the unit cell;
Classification means for classifying which of a plurality of predetermined temperature sections the temperatures at a predetermined timing detected by the temperature detection section belong to,
For each of the unit cells, for each temperature category, frequency acquisition means for acquiring the frequency classified into each temperature segment,
Based on the frequency acquired by the frequency acquisition unit, a category determination unit that determines a temperature category to which each unit cell belongs,
A storage battery maintenance apparatus comprising: a deterioration determination unit that determines deterioration of a single cell determined to belong to the temperature section for each temperature section.   7. The deterioration determination unit determines deterioration of the assembled battery based on a single cell that belongs to the highest temperature section and has the highest frequency among the temperature sections. The storage battery maintenance apparatus of description.   7. The deterioration determination unit determines deterioration of the assembled battery based on a single cell belonging to the lowest temperature category and having the highest frequency among the temperature categories. The storage battery maintenance apparatus of description. A voltage detection step of detecting the voltage of each of the plurality of single cells constituting the assembled battery;
A classification step for classifying to which of a plurality of predetermined voltage categories the voltages at a predetermined timing detected in the voltage detection step belong;
For each of the single cells, for each voltage classification, a frequency acquisition step of acquiring the frequency classified into each voltage classification;
Based on the frequency acquired in the frequency acquisition step, a category determination step for determining a voltage category to which each unit cell belongs,
A storage battery maintenance method comprising: a deterioration determination step for determining deterioration of a single cell determined to belong to the voltage section for each voltage section.   10. The deterioration determination step includes determining deterioration of the assembled battery based on a single cell that belongs to a voltage category having the highest voltage value and has the highest frequency among the voltage categories. The storage battery maintenance method as described in. A voltage detection step of detecting the voltage of each of the plurality of single cells constituting the assembled battery;
A classification step for classifying which integrated value of the voltage in a predetermined period detected in the voltage detection step belongs to which of a plurality of predetermined integrated value categories;
A storage battery maintenance method comprising: a deterioration determination step for determining deterioration of a single cell belonging to the integral value section for each integral value section.   In the deterioration determination step, the deterioration of the assembled battery is determined based on a single cell that belongs to the integral value section having the largest integral value among the integral value sections and has the largest integral value. Item 12. A storage battery maintenance method according to Item 11. A temperature detecting step for detecting a temperature of the assembled battery or the unit cell;
A classification step for classifying which of a plurality of predetermined temperature categories the temperatures at a predetermined timing detected by the temperature detection means belong;
For each unit cell, a frequency acquisition step for acquiring the frequency classified into each temperature category for each temperature category;
Based on the frequency acquired in the frequency acquisition step, a category determination step for determining a temperature category to which each unit cell belongs,
A storage battery maintenance method comprising: a deterioration determination step for determining deterioration of a single cell determined to belong to the temperature section for each temperature section.   The deterioration determination step determines deterioration of the assembled battery based on a single cell belonging to the highest temperature section of the temperature sections and having the highest frequency. The storage battery maintenance method of description. The deterioration determination step includes determining deterioration of the assembled battery based on a single cell belonging to the lowest temperature category and having the highest frequency among the temperature categories. The storage battery maintenance method of description.

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