WO2015151652A1 - 蓄電池システムおよび電池モジュールの配置方法 - Google Patents
蓄電池システムおよび電池モジュールの配置方法 Download PDFInfo
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- WO2015151652A1 WO2015151652A1 PCT/JP2015/055160 JP2015055160W WO2015151652A1 WO 2015151652 A1 WO2015151652 A1 WO 2015151652A1 JP 2015055160 W JP2015055160 W JP 2015055160W WO 2015151652 A1 WO2015151652 A1 WO 2015151652A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0024—Parallel/serial switching of connection of batteries to charge or load circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/10—Batteries in stationary systems, e.g. emergency power source in plant
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- Embodiments of the present invention relate to a storage battery system capable of recovering system performance and capable of maintaining system performance for a long period of time, and a battery module arrangement method.
- a large-scale storage battery system using secondary batteries is expected to be used for applications such as suppression of fluctuations in power generation using natural energy such as sunlight and wind power, suppression of fluctuations in power demand, and peak shift.
- large-scale storage battery systems using lithium ion batteries with remarkable performance improvements have appeared.
- Such a large-scale storage battery system is expected to be operated for a long period of 15 years or 20 years.
- a system is constructed by hierarchically repeating a series configuration and a parallel configuration, such as connecting one or more cells, which are the smallest unit of a storage battery, in series, and connecting them in parallel. It is common to do.
- a replacement unit in the event of failure or deterioration, it is not common for large-scale storage battery systems employing lithium ion batteries to be replaceable for each single cell, and several to tens of so-called modules or units are used.
- a unit consists of a group of cells. In this specification, the minimum unit for such replacement is referred to as a battery module.
- the performance of a battery module that is configured by connecting a series of cells, which are the smallest unit of a storage battery, and some of them together in series and parallel deteriorates over time.
- the deterioration rate of the individual cells and battery modules varies depending on the use conditions, and even if the same use conditions are intended, in addition to the original individual differences, the installation position (for example, spatial arrangement or Depending on the arrangement on the circuit, strict use conditions vary, and as a result, the degradation rate also varies.
- the performance of the cell group or battery module group connected in series is determined by the lowest characteristic among the series components. For this reason, when the characteristic dispersion
- Embodiment of this invention aims at providing the storage battery system which can recover the performance of a system, and can maintain the performance of a system for a long term, and the arrangement
- a storage battery system is provided with a plurality of battery panels formed by connecting a plurality of battery modules serving as replacement units to form a battery panel group. Is connected to a PCS that performs charge / discharge control, and in the storage battery system connected to the battery controller, the battery controller diagnoses the deterioration state by grasping the characteristics of each battery module; and A numbering unit that numbers each battery module in order from the smaller to the larger degree of degradation based on the characteristics grasped by the degradation diagnosis unit, and the number that is numbered by the numbering unit are connected in the same battery panel. And a rearrangement determining unit that determines the rearrangement position of each battery module so as to be a number.
- the battery module arrangement method executed in the embodiment as described above is one embodiment of the present invention.
- 3 is a flowchart illustrating a method for arranging battery modules according to an embodiment of the present invention. It is a three-dimensional bar graph which shows the relationship between the battery panel after rearrangement in a state where there is a characteristic variation between the battery modules and the battery module, and the performance index.
- FIG. 1 (Overall configuration of storage battery system)
- a plurality of battery modules 1 are connected in series to form a battery panel 2, and the plurality of battery panels 2 are connected in parallel with each other by wires (direct current) 4, and the negative electrodes are connected in parallel with each other.
- System: power converter) 3 is connected to the DC terminal.
- the AC terminal of the PCS 3 is connected to a power system (not shown) via a wiring (AC) 6.
- the PCS 3 is connected to the battery controller 7 via a signal line, and performs charge / discharge control to the battery panel 2 group connected in parallel.
- the battery controller 7 and each battery panel 2 are also connected by signal lines for state monitoring.
- the battery module 1 is a combination of a plurality of cells in series or parallel, or in series and parallel, and is a minimum unit for replacement.
- the wiring resistance 5 is arranged between the battery board 2 and the PCS 3 and the battery board 2 in order to express the wiring resistance of the wiring (DC) 4 explicitly.
- FIG. 2 shows an example of physical battery module arrangement in the battery panel 2.
- a plurality of battery modules 1 are stacked in a vertical direction in a metal casing to form a battery panel 2.
- the battery panel 2 is not subjected to forced air cooling by a fan or the like, but has a natural air cooling structure by convection.
- FIG. 3 shows a detailed configuration of the battery controller 7.
- the battery controller 7 includes a deterioration diagnosis unit 11 that performs deterioration diagnosis on all the battery modules 1, a numbering unit 12 that assigns numbers to the battery modules 1 in the system according to the result of the deterioration diagnosis, A rearrangement determining unit 13 that determines a rearrangement position according to the numbering.
- the deterioration progression (characteristic change) in the storage battery system 10 shown in FIG. 1 will be specifically described.
- the same current flows through the plurality of battery modules 1 connected in series.
- Joule heat is generated due to the internal resistance of the battery module 1 and the temperature of the battery module 1 rises.
- the ambient temperature in the battery panel 2 also increases.
- the temperature rises in the warmed battery panel 2 and a vertical temperature distribution is generated in the battery panel 2.
- the ambient temperature of the battery module 1 at a high position in the vertical direction is higher than the ambient temperature of the battery module 1 at a low position.
- the progress of deterioration (internal resistance increase) of the battery module 1 at a high position proceeds faster than the progress of deterioration of the battery module 1 at a low position.
- the generation of Joule heat generated at the time of charging / discharging of the battery module 1 at a high position is larger than that of the battery module 1 at a low position. Therefore, it is considered that the temperature difference between the battery module 1 at the high position and the battery module 1 at the low position increases with time.
- the above deterioration progress phenomenon can be summarized as follows.
- the capacity of one surface of the battery panel 2 cannot exceed the capacity of the battery module 1 having the minimum capacity (for example, the battery having the maximum capacity). If complete discharge to full charge is performed in accordance with the module 1, the other battery modules 1 are overdischarged or overcharged). That is, regarding the capacity, the module performance having the lowest performance in the series configuration defines the performance of the entire series configuration. On the other hand, when considering the battery panel 2 group having a parallel configuration, the capacity of the entire system is at least statically the total capacity of the battery panels 2.
- Tables 1 to 3 below show examples of estimated system performance degradation.
- a total of 100 battery modules 1 in the 10 ⁇ 10 matrix are arranged in the horizontal direction (total 10 planes) for the battery panel 2 and in the vertical direction (total 10) for the battery modules 1 in the battery panel 2. It is represented by The numerical value in the square is a dimensionless relative index representing the performance (for example, capacity) of each battery module 1.
- the capacity of each battery panel 2 is equal to the minimum value among the corresponding indicators of 10 battery modules per minute in the vertical direction, and is shown in the margin below the matrix.
- the overall system performance is the total value of the battery panel 2 index, and is shown in the outer right column of the matrix.
- Table 1 shows the case where there is no variation in the performance index in the battery module group 1 (all are 0.5), and the system performance is 5.000 (see also FIG. 4).
- Table 2 shows a case where the battery module 1 group is automatically generated as a random number having an average of 0.5 and a standard deviation of 0.1 as a performance index, and the system performance is 3.605 (see FIG. 5). See also).
- FIG. 6 the flowchart of the arrangement
- the expression of the system scale is more generalized, and the number of battery panels is Np_max, and the number of modules in one battery panel is Nm_max.
- the degradation diagnosis unit 11 of the battery controller 7 performs degradation diagnosis on all the battery modules 1 by estimating the capacity of each battery module 1 (step S1).
- capacity estimation is first performed for each cell, and the battery module 1 has the minimum cell capacity in the target battery module 1. Capacity.
- the number assigning unit 12 assigns numbers to all the battery modules 1 in the storage battery system 10 in ascending order in descending order of the capacity value estimated in step S1. That is, numbers from 1 to Np_max ⁇ Nm_max are assigned in this order (step S2).
- the number assigning unit 12 assigns numbers from 1 to Np_max in ascending order of the wiring distance from the PCS 3 to all the battery panels 2 in the system (step S3).
- the rearrangement determination unit 13 initializes the battery panel number Np to be rearranged and the battery module number Nm to be rearranged in the battery panel (steps S4 and S5).
- the rearrangement determination unit 13 determines to arrange the battery module 1 having the smallest number among the non-arranged battery module groups in the Nm-th stage from the top of the battery panel 2 with the number Np (step). S6). That is, for the first time, it is determined that the battery module 1 with the number 1 is arranged at the uppermost stage of the battery panel 2 closest to the PCS 3.
- the rearrangement determination unit 13 completes the determination of the rearrangement position of the battery module 1 in the battery panel 2 by repeating the process of step S6 for the same battery panel 2 (steps S7 and S8).
- the rearrangement determination unit 13 completes the determination of the rearrangement positions of the battery modules 1 for all the battery panels 2 in the system by repeating the processes of steps S6 to S8 (steps S9 and S10).
- the battery module 1 is actually rearranged based on the rearrangement position of the battery module 1 determined by the process shown in FIG.
- the rearrangement can be performed by a rearrangement unit (not shown).
- Table 3 shows the relationship between the battery panel 2 and the battery module 1 and the performance index when the rearrangement determination is performed according to the procedure shown in FIG. 6 in a state in which there is a characteristic variation between the battery modules 1 shown in Table 2. It is shown.
- the battery module arrangement method according to the present embodiment can be suitably used particularly for maintaining system performance when a large-scale storage battery system is operated for a long period of time. Further, it can be used for initial arrangement of a storage battery system using a battery module group having various characteristics from the beginning.
- Capacity is an important characteristic parameter in applications where the storage battery is fully utilized from full charge to complete discharge. For example, for fluctuation control applications such as solar power generation and wind power generation, it can be handled at any time rather than capacity. In such cases, it is effective to use internal resistance as a characteristic value instead of capacitance.
- both the arrangement of the battery module 1 in the battery panel 2 and the arrangement between the battery panels 2 are combined, but only the arrangement of the battery module 1 in the battery board 2 can be performed. .
- the characteristic values of the battery modules 1 in the battery panel 2 can be serialized to suppress the variation in characteristics within the battery panel 2.
- the smaller the wiring resistance the larger the current value when the driving current of the PCS 3 changes and the faster the deterioration rate. It is effective to dispose the battery module 1 with a small degree of deterioration in the direction where the wiring resistance is smaller. For this reason, it is effective to arrange a battery panel 2 having a better characteristic value (for example, a total value or an average value of the characteristic values of the built-in battery module 1) in a smaller wiring resistance.
- the battery module arrangement method of the above embodiment is considered to be performed in response to the initial manufacturing variation of each battery module 1 at the start of system operation. There is no denying it. Therefore, it is also effective to restore the system performance by performing relocation periodically such as every several years. In addition, based on the result of the diagnosis of all battery modules 1 that are performed regularly / irregularly rather than based on the elapsed time (this diagnosis can also be performed online while operating), relocation is performed depending on the situation of system performance degradation. There are also operational methods to do.
- the deterioration diagnosis unit 11 in the battery controller 7 performs the deterioration diagnosis of the battery module 1
- the numbering unit 12 assigns a number to the battery module 1
- the rearrangement determination unit 13 performs the relocation determination. Although the arrangement position is determined, it is possible to give these functions to a device outside the battery controller 7.
- the number assigning unit 12 is assigned to each battery module in ascending order from the smaller degree of deterioration based on the characteristics grasped by the deterioration diagnosing unit 11, but is assigned in descending order. You can also. Similarly, the number assigning unit 12 numbers each battery panel 2 in ascending order from the lower resistance value to the higher resistance value along the wiring resistance value between the PCS 3 and each battery panel 2, but in descending order. It can also be numbered.
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Abstract
Description
本実施形態では、蓄電池システムとして、電池モジュールを複数個直列接続したものを複数個並列接続した構成を例として説明する。本実施形態では、運用中の蓄電池システムに対して任意の時点で各電池モジュールの劣化状態の診断を行い、その結果に基づいて各電池モジュールの再配置を行う。具体的には、蓄電池システム内の全電池モジュールを劣化程度に応じて順位付けし、同一直列構成群には連番の電池モジュールを再配置することで、直列構成内の劣化ばらつきを低減することによってシステム全体の性能の回復を実現することを特徴とする。以下、本実施形態に係る蓄電池システムの構成について説明する。
図1に、本発明の一実施形態に係る蓄電池システムの全体構成を示す。
蓄電池システム10は、電池モジュール1が複数個直列に接続されて電池盤2を構成し、複数の電池盤2が配線(直流)4によって正極同士、負極同士それぞれ並列に接続され、PCS(Power Conditioning System:電力変換器)3の直流端子に接続されている。また、PCS3の交流端子からは配線(交流)6を介して図示しない電力系統に連系接続されている。さらに、PCS3は電池コントローラ7と信号線で接続され、並列接続された電池盤2群への充放電制御を行うようにされている。電池コントローラ7と各電池盤2の間も状態監視のための信号線で接続されている。
図3に、電池コントローラ7の詳細な構成を示す。
電池コントローラ7は、全ての電池モジュール1に対して劣化診断を行う劣化診断部11と、劣化診断の結果に応じてシステム内の電池モジュール1に対して付番を行う番号付与部12と、前記付番に従って再配置位置を決定する再配置決定部13と、を備えている。
次に、リチウムイオン電池を用いた場合の劣化現象について説明する。劣化によって変化する代表的なパラメータは、容量と内部抵抗である。容量は経時的に減少し、内部抵抗は経時的に増加する。容量の減少の要因の一つに内部抵抗増加が挙げられるが、内部抵抗に起因しない純粋な容量劣化も存在すると考えられている。また、劣化速度は一般に電池温度が高いほど大きくなる。
の変化とそれに伴う特性変化が関係するために複雑であり、一概には表現できない。
(A)同一電池盤2内では、鉛直方向の高い位置にある電池モジュール1の劣化が速い。
(B)電池盤2の間では、PCS3からの配線距離が短い電池盤2内の電池モジュール1の劣化が速い。
次に、特性がばらついた電池モジュール1を組み合わせて構成される蓄電池システム10全体の性能について説明する。電池盤2の一面の中の直列接続された電池モジュール群についてみると、電池盤2の一面の容量(Ah)は最小容量の電池モジュール1の容量を超えることはできない(例えば、最大容量の電池モジュール1に合わせて完放電から満充電まで行うと、他の電池モジュール1は過放電あるいは過充電となってしまう)。即ち、容量については直列構成内で最も性能の低いモジュール性能が直列構成全体の性能を規定する。これに対して、並列構成である電池盤2群について考えると、システム全体の容量は、少なくとも静的には各電池盤2の容量の合計になる。
以下の表1~表3に、システム性能低下の試算例を示す。これらの表では、電池盤2を横方向(計10面)、電池盤2内の電池モジュール1を縦方向(計10個)の総計100個の電池モジュール1を10×10のマトリクスの各マスで表している。マスの中の数値は各電池モジュール1の性能(例えば、容量)を表す無次元の相対指標である。各電池盤2の容量は対応した縦方向の10個の電池モジュール1分の指標のうちの最小値に等しく、マトリクス下の欄外に示している。システム全体性能は電池盤2指標の合計値であり、マトリクス右下の欄外に示している。
図6に、本実施形態による電池モジュール1の配置方法のフローチャートを示す。ここで、システム規模の表現をより汎用化し、電池盤面数をNp_max、電池盤一面の中のモジュール数をNm_maxとする。
図6の処理によって電池モジュール1の再配置位置の決定を行った効果について表3および図7を用いて説明する。
(1)上記実施形態では特性値として容量を用いたが、内部抵抗を用いてもよい。蓄電池を満充電から完放電までフルに活用するようなアプリケーションにおいては容量が重要な特性パラメータであるが、例えば、太陽光発電や風力発電などの変動抑制用途では、容量よりも任意時点で対応可能な出力が重要であり、こうしたケースでは容量ではなく内部抵抗を特性値として利用することが効果的である。
2…電池盤
3…PCS
4…配線(直流)
5…配線抵抗
6…配線(交流)
7…電池コントローラ
10…蓄電池システム
11…劣化診断部
12…番号付与部
13…再配置決定部
Claims (8)
- 交換単位となる電池モジュールを複数個接続してなる電池盤が複数個設けられて電池盤群をなし、該電池盤群が充放電制御を行うPCSと接続され、該PCSは電池コントローラと接続された蓄電池システムにおいて、
前記電池コントローラは、各電池モジュールの特性を把握することによって劣化状態を診断する劣化診断部と、該劣化診断部により把握した前記特性に基づいて劣化度が小さい方から大きい方にかけて順に各電池モジュールに付番する番号付与部と、該番号付与部によって付番された番号が同一電池盤内で連番となるように前記各電池モジュールの再配置位置を決定する再配置決定部と、を有することを特徴とする蓄電池システム。 - 前記電池盤群は、蓄電池の最小単位であるセルを1個または複数個並列接続した電池モジュールを複数個直列に接続して電池盤とし、この電池盤を更に複数個並列に接続したものであることを特徴とする請求項1記載の蓄電池システム。
- 前記電池モジュールの前記特性として容量を利用したことを特徴とする請求項1又は2記載の蓄電池システム。
- 前記電池モジュールの前記特性として内部抵抗を利用したことを特徴とする請求項1又は2記載の蓄電池システム。
- 前記再配置決定部は、前記電池盤内で雰囲気温度の勾配方向に沿って温度の高い方から低い方にかけて前記付番された電池モジュールの番号が劣化度の小さい順となるように、前記電池モジュールの再配置位置を決定することを特徴とする請求項1乃至4のいずれか1項記載の蓄電池システム。
- 前記番号付与部は、前記PCSと前記各電池盤との間の配線抵抗値に沿って抵抗値の低い方から高い方にかけて順に各電池盤に付番し、前記再配置決定部は、前記付番された番号に沿って前記電池盤の劣化度が小さい方から大きい方の順になるように、前記電池モジュールの再配置位置を決定することを特徴とする請求項1乃至5のいずれか1項記載の蓄電池システム。
- 交換単位となる電池モジュールを複数個接続してなる電池盤が複数個設けられて電池盤群をなし、該電池盤群が充放電制御を行うPCSと接続され、該PCSは電池コントローラと接続された蓄電池システムにおける電池モジュールの配置方法であって、
各電池モジュールの特性を把握することによって劣化状態を診断する劣化診断工程と、該劣化診断工程により把握した前記特性に基づいて劣化度が小さい方から大きい方にかけて順に各電池モジュールに付番する番号付与工程と、該番号付与工程によって付番された番号が同一電池盤内で連番となるように前記各電池モジュールの再配置を行う再配置工程と、を有することを特徴とする電池モジュールの配置方法。 - 定期的に全電池モジュールの特性を把握した結果、又は任意の時点で全電池モジュールの特性を把握した結果に基づいて、前記蓄電池システムの性能の低下が所定の値を超えた場合に、前記各工程を実施することを特徴とする請求項7記載の電池モジュールの配置方法。
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