JP2021045017A - Battery control unit and cell system - Google Patents

Battery control unit and cell system Download PDF

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JP2021045017A
JP2021045017A JP2019167284A JP2019167284A JP2021045017A JP 2021045017 A JP2021045017 A JP 2021045017A JP 2019167284 A JP2019167284 A JP 2019167284A JP 2019167284 A JP2019167284 A JP 2019167284A JP 2021045017 A JP2021045017 A JP 2021045017A
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batteries
control unit
battery
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combination
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JP7295750B2 (en
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ちひろ 大野
Chihiro Ono
ちひろ 大野
荘田　隆博
Takahiro Shoda
隆博 荘田
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Yazaki Corp
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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
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Abstract

To provide a battery control unit and a battery system capable of improving the efficiency of charging or discharging.SOLUTION: Switching units 41a to 41c and 42a to 42c are provided for each of a plurality of batteries 21a to 21c and 22a to 22c, and switch the corresponding batteries between a connected state and a disconnected state. A control unit 8 controls the switching units 41a to 41c and 42a to 42c corresponding to the batteries 21a to 21c and 22a to 22c, which are determined to have reached a final voltage during charging or discharging, to be in the disconnected state. The control unit 8 sets a combination of the batteries 21a to 21c and 22a to 22c that have not reached the final voltage, which are controlled to be in the disconnected state, obtains the total voltage of a plurality of assembled batteries 21 and 22 for each set combination, and controls the batteries 21a to 21c and 22a to 22c in a combination in which the total voltages of the plurality of assembled batteries 21 and 22 are equal to be in the disconnected state.SELECTED DRAWING: Figure 1

Description

本発明は、電池制御ユニットおよび電池システム、に関する。 The present invention relates to a battery control unit and a battery system.

複数の電池を直列に接続して構成される電池システムがある。複数の電池は、例えば製造時のバラツキや動作環境のバラツキに起因して、劣化がばらつく。例えば、熱源に近い電池は早く劣化してしまうが、熱源から離れた電池は劣化が遅い。 There is a battery system that consists of connecting multiple batteries in series. The deterioration of a plurality of batteries varies due to, for example, variations in manufacturing and variations in the operating environment. For example, a battery close to a heat source deteriorates quickly, but a battery away from a heat source deteriorates slowly.

このため、充放電時に劣化の進んだ電池が最初に充放電終止電圧に達してしまう。この場合、他の電池に余力が残っていたとしても充放電を停止しなければならず、電池容量を使いきることができない。そこで、充電終了電圧に達した電池をバイパスして充電から切り離し、充電終了電圧に達していない電池の充電を継続させるシステムが提案されている（特許文献１）。また、放電時も同様に、放電終止電圧に達した電池をバイパスして放電から切り離し、放電終止電圧に達してない電池の放電を継続させる電池システムが考えられる。 For this reason, the battery that has deteriorated during charging / discharging first reaches the charging / discharging end voltage. In this case, even if the other batteries have remaining power, charging / discharging must be stopped, and the battery capacity cannot be used up. Therefore, a system has been proposed in which a battery that has reached the end-of-charge voltage is bypassed and disconnected from charging, and charging of a battery that has not reached the end-of-charge voltage is continued (Patent Document 1). Similarly, at the time of discharging, a battery system is conceivable in which the battery that has reached the end-of-discharge voltage is bypassed and separated from the discharge, and the battery that has not reached the end-of-discharge voltage is continuously discharged.

しかしながら、上述した従来の電池システムでは、放電時において、電池のバイパス状態を切り替えるたびに負荷に対する給電が停止する。そこで、本出願人は、複数の電池から構成される組電池を複数、並列接続して、複数の組電池の１つがバイパス切り替え中でも、残りが負荷への給電を維持できるようにすることを考えた。 However, in the conventional battery system described above, when the battery is discharged, the power supply to the load is stopped every time the bypass state of the battery is switched. Therefore, the applicant has considered connecting a plurality of assembled batteries composed of a plurality of batteries in parallel so that even if one of the plurality of assembled batteries is bypass-switched, the rest can maintain power supply to the load. It was.

特開２０１３−３１２４９号公報Japanese Unexamined Patent Publication No. 2013-31249

しかしながら、上述した従来技術は、電池をバイパスして利用するため、組電池を並列接続すると、組電池間の総電圧に大きな差異が発生する。このため、総電圧の最も高い組電池からしか放電を行うことができなかった。また、総電圧の最も低い組電池しか充電を行うことができず、充電、放電の効率がよくない、という問題があった。 However, since the above-mentioned conventional technique is used by bypassing the batteries, when the assembled batteries are connected in parallel, a large difference occurs in the total voltage between the assembled batteries. Therefore, it was possible to discharge only from the assembled battery having the highest total voltage. Further, there is a problem that only the assembled battery having the lowest total voltage can be charged, and the efficiency of charging and discharging is not good.

本発明は、上述した事情に鑑みてなされたものであり、その目的は、充電又は放電の効率を向上した電池制御ユニットおよび電池システムを提供することにある。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a battery control unit and a battery system having improved charging or discharging efficiency.

前述した目的を達成するために、本発明に係る電池制御ユニットおよび電池システムは、下記［１］〜［５］を特徴としている。
［１］
互いに並列接続された複数の組電池各々が有する、互いに直列接続された複数の電池、毎に設けられ、対応する前記電池が他の前記電池と直列接続された接続状態と、対応する前記電池が他の前記電池と直列接続から切り離された非接続状態と、に切り替える切替部と、
充電又は放電時に終止電圧に達したと判定した前記電池に対応する前記切替部を前記非接続状態に制御する第１制御部と、
複数の前記組電池の総電圧が同等になるように、前記終止電圧に達していない前記電池の前記切替部を前記非接続状態に制御する第２制御部と、を備えた、
電池制御ユニットであること。
［２］
［１］に記載の電池制御ユニットにおいて、
前記第２制御部は、前記終止電圧に達していない前記電池のうち、前記非接続状態に制御するものの組み合わせを設定し、設定した組合せ毎に複数の前記組電池の前記総電圧を求め、複数の前記組電池の前記総電圧が同等となる組み合わせに従って前記切替部を制御する、
電池制御ユニットであること。
［３］
［２］に記載の電池制御ユニットにおいて、
前記第２制御部は、充電時において前記同等となる組み合わせ毎に、充電電力を求めて、求めた充電電力が最大となる組み合わせに従って前記切替部を制御する、
電池制御ユニットであること。
［４］
［２］又は［３］に記載の電池制御ユニットにおいて、
前記第２制御部は、放電時において前記同等となる組み合わせのうち前記組電池の放電電力が最大となる組み合わせに従って前記切替部を制御する、
電池制御ユニットであること。
［５］
直列接続された複数の電池を有し、互いに並列接続された複数の組電池と、
［１］〜［４］の何れか１項に記載の電池制御ユニットと、を備えた、
電池システムであること。 In order to achieve the above-mentioned object, the battery control unit and the battery system according to the present invention are characterized by the following [1] to [5].
[1]
A plurality of batteries connected in series to each other, each of a plurality of assembled batteries connected in parallel to each other, a connected state in which the corresponding battery is connected in series with the other batteries, and the corresponding battery A switching unit that switches between the non-connected state disconnected from the series connection with the other batteries, and
A first control unit that controls the switching unit corresponding to the battery, which is determined to have reached the final voltage during charging or discharging, in the non-connected state.
A second control unit that controls the switching unit of the battery that has not reached the end voltage to the non-connected state so that the total voltage of the plurality of assembled batteries becomes equal is provided.
Must be a battery control unit.
[2]
In the battery control unit according to [1],
The second control unit sets a combination of the batteries that have not reached the final voltage and controls the non-connected state, obtains the total voltage of the plurality of assembled batteries for each set combination, and obtains a plurality of such batteries. The switching unit is controlled according to a combination in which the total voltages of the assembled batteries are equal to each other.
Must be a battery control unit.
[3]
In the battery control unit according to [2],
The second control unit obtains charging power for each combination that becomes equivalent at the time of charging, and controls the switching unit according to the combination that maximizes the obtained charging power.
Must be a battery control unit.
[4]
In the battery control unit according to [2] or [3],
The second control unit controls the switching unit according to the combination in which the discharge power of the assembled battery is maximized among the equivalent combinations at the time of discharging.
Must be a battery control unit.
[5]
With multiple assembled batteries having multiple batteries connected in series and connected in parallel with each other,
The battery control unit according to any one of [1] to [4] is provided.
Must be a battery system.

上記［１］および［５］の構成の電池制御ユニットおよび電池システムによれば、第２制御部が、複数の組電池の総電圧が同等になるように、終止電圧に達していない電池の切替部を非接続状態に制御する。これにより、複数の組電池の総電圧が同等となり、同時に充電又は放電を行うことができ、充電又は放電の効率の向上を図ることができる。
上記［２］の構成の電池制御ユニットによれば、第２制御部は、終止電圧に達していない電池のうち、非接続状態に制御するものの組み合わせを設定し、設定した組合せ毎に複数の組電池の総電圧を求め、複数の組電池の総電圧が同等となる組み合わせに従って切替部を制御する。これにより、容易に、複数の組電池の総電圧が同等とすることができる。
上記［３］の構成の電池制御ユニットによれば、第２制御部は、同等となる組み合わせ毎に、充電電力を求めて、求めた充電電力が最大となる組み合わせに従って切替部を制御する。これにより、充電電力を最大とすることができ、より一層、充電の効率の向上を図ることができる。
上記［４］の構成の電池制御ユニットによれば、第２制御部は、同等となる組み合わせのうち組電池の放電電力が最大となる組み合わせに従って切替部を制御する。これにより、放電電力を最大とすることができ、より一層、放電の効率の向上を図ることができる。 According to the battery control unit and the battery system having the above configurations [1] and [5], the second control unit switches the batteries that have not reached the final voltage so that the total voltages of the plurality of assembled batteries are equal. Control the unit to the disconnected state. As a result, the total voltage of the plurality of assembled batteries becomes equal, and charging or discharging can be performed at the same time, and the efficiency of charging or discharging can be improved.
According to the battery control unit having the configuration of [2] above, the second control unit sets a combination of batteries that have not reached the final voltage and controls the non-connected state, and a plurality of sets are set for each set combination. The total voltage of the batteries is obtained, and the switching unit is controlled according to a combination in which the total voltages of a plurality of assembled batteries are equal. As a result, the total voltages of the plurality of assembled batteries can be easily made equal.
According to the battery control unit having the configuration of the above [3], the second control unit obtains the charging power for each equivalent combination and controls the switching unit according to the combination in which the obtained charging power is maximized. As a result, the charging power can be maximized, and the charging efficiency can be further improved.
According to the battery control unit having the configuration of [4] above, the second control unit controls the switching unit according to the combination having the maximum discharge power of the assembled battery among the equivalent combinations. As a result, the discharge power can be maximized, and the discharge efficiency can be further improved.

本発明によれば、充電又は放電の効率の向上を図ることができる電池制御ユニットおよび電池システムを提供することができる。 According to the present invention, it is possible to provide a battery control unit and a battery system capable of improving the efficiency of charging or discharging.

以上、本発明について簡潔に説明した。更に、以下に説明される発明を実施するための形態（以下、「実施形態」という。）を添付の図面を参照して通読することにより、本発明の詳細は更に明確化されるであろう。 The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through the embodiments described below (hereinafter referred to as "embodiments") with reference to the accompanying drawings. ..

図１は、本発明の電池システムを示す回路図である。FIG. 1 is a circuit diagram showing a battery system of the present invention. 図２は、図１に示す制御部の放電処理手順を示すフローチャートである。FIG. 2 is a flowchart showing a discharge processing procedure of the control unit shown in FIG. 図３は、図１に示す制御部の充電処理手順を示すフローチャートである。FIG. 3 is a flowchart showing a charging processing procedure of the control unit shown in FIG.

本発明に関する具体的な実施形態について、各図を参照しながら以下に説明する。 Specific embodiments of the present invention will be described below with reference to the respective figures.

図１に示す電池システム１は、例えば劣化が進んだ電池を再利用して電力を供給する装置である。 The battery system 1 shown in FIG. 1 is, for example, a device that recycles a deteriorated battery to supply electric power.

同図に示すように、電池システム１は、複数の組電池２１、２２と、電池制御ユニット３と、を備えている。複数の組電池２１、２２は、互いに並列接続されて、負荷１０及び充電器４０に接続されている。本実施形態では、説明を簡単にするために２つの組電池２１、２２を並列接続した例について説明するが、これに限ったものではない。組電池２１、２２の数は複数あればよく、３つ以上でもよい。 As shown in the figure, the battery system 1 includes a plurality of assembled batteries 21 and 22, and a battery control unit 3. The plurality of assembled batteries 21 and 22 are connected to each other in parallel and connected to the load 10 and the charger 40. In the present embodiment, an example in which two assembled batteries 21 and 22 are connected in parallel will be described for the sake of simplicity, but the present embodiment is not limited to this. The number of the assembled batteries 21 and 22 may be a plurality, and may be three or more.

組電池２１は、複数の電池２１ａ〜２１ｃを有している。組電池２２は、複数の電池２２ａ〜２２ｃを有している。本実施形態では、説明を簡単にするために、３つの電池２１ａ〜２１ｃ、２２ａ〜２２ｃを直列接続した例について説明するが、これに限ったものではない。電池２１ａ〜２１ｃ、２２ａ〜２２ｃの数は複数あればよく、２つでも、４つ以上でもよい。複数の電池２１ａ〜２１ｃ、２２ａ〜２２ｃは各々、充放電可能な蓄電池であり、１つのセルから構成されていてもよいし、複数のセルから構成されていてもよい。 The assembled battery 21 has a plurality of batteries 21a to 21c. The assembled battery 22 has a plurality of batteries 22a to 22c. In the present embodiment, for the sake of simplicity, an example in which three batteries 21a to 21c and 22a to 22c are connected in series will be described, but the present invention is not limited thereto. The number of batteries 21a to 21c and 22a to 22c may be plural, and may be two or four or more. Each of the plurality of batteries 21a to 21c and 22a to 22c is a rechargeable and dischargeable storage battery, and may be composed of one cell or a plurality of cells.

電池制御ユニット３は、複数の切替部４１ａ〜４１ｃ、４２ａ〜４２ｃと、複数の電圧測定部５１ａ〜５１ｃ、５２ａ〜５２ｃと、複数の充放電制限部６１、６２と、制御部８と、を備えている。 The battery control unit 3 includes a plurality of switching units 41a to 41c, 42a to 42c, a plurality of voltage measuring units 51a to 51c, 52a to 52c, a plurality of charge / discharge limiting units 61, 62, and a control unit 8. I have.

複数の切替部４１ａ〜４１ｃは、複数の電池２１ａ〜２１ｃに各々対応して設けられている。複数の切替部４２ａ〜４２ｃは、複数の電池２２ａ〜２２ｃに各々対応して設けられている。複数の切替部４１ａ〜４１ｃ、４２ａ〜４２ｃは、互いに同じ構成である。 The plurality of switching portions 41a to 41c are provided corresponding to the plurality of batteries 21a to 21c, respectively. The plurality of switching portions 42a to 42c are provided corresponding to the plurality of batteries 22a to 22c, respectively. The plurality of switching portions 41a to 41c and 42a to 42c have the same configuration as each other.

切替部４１ａ〜４１ｃ、４２ａ〜４２ｃは、対応する電池２１ａ〜２１ｃ、２２ａ〜２２ｃが他の電池２１ａ〜２１ｃ、２２ａ〜２２ｃと直列接続された接続状態と、対応する電池２１ａ〜２１ｃ、２２ａ〜２２ｃが他の電池２１ａ〜２１ｃ、２２ａ〜２２ｃとの直列接続から切り離された非接続状態と、の間で切り替え可能に設けられている。詳しく説明すると、切替部４１ａ〜４１ｃ、４２ａ〜４２ｃにより接続状態に切り替えられた電池２１ａ〜２１ｃ、２２ａ〜２２ｃ同士が直列接続されて電源として用いられる。一方、切替部４１ａ〜４１ｃ、４２ａ〜４２ｃにより非接続状態に切り替えられた電池２１ａ〜２１ｃ、２２ａ〜２２ｃが接続状態の電池２１ａ〜２１ｃ、２２ａ〜２２ｃから切り離されて電源として用いられなくなる。 The switching units 41a to 41c and 42a to 42c have a connection state in which the corresponding batteries 21a to 21c and 22a to 22c are connected in series with other batteries 21a to 21c and 22a to 22c, and the corresponding batteries 21a to 21c and 22a to 22a. The 22c is provided so as to be switchable between a non-connected state disconnected from the series connection with the other batteries 21a to 21c and 22a to 22c. More specifically, the batteries 21a to 21c and 22a to 22c switched to the connected state by the switching units 41a to 41c and 42a to 42c are connected in series and used as a power source. On the other hand, the batteries 21a to 21c and 22a to 22c switched to the non-connected state by the switching units 41a to 41c and 42a to 42c are separated from the connected batteries 21a to 21c and 22a to 22c and are not used as a power source.

切替部４１ａは、電池２１ａに直列接続された第１スイッチＳＷ１１ａと、電池２１ａ及び第１スイッチＳＷ１１ａに並列接続された第２スイッチＳＷ１２ａと、から構成されている。第１スイッチＳＷ１１ａは、一端Ｔ１１が電池２１ａの一極（例えば正極）に接続されている。第２スイッチＳＷ１２ａは、一端Ｔ２１が電池２１ａの他極（例えば負極）に接続され、その他端Ｔ２２が第１スイッチＳＷ１１ａの他端Ｔ１２に接続されている。切替部４１ｂ、４１ｃについては、上述した切替部４１ａについての説明中の「ａ」を「ｂ」、「ｃ」にそれぞれ置き換えて説明することができるため、詳細な説明を省略する。 The switching unit 41a includes a first switch SW11a connected in series to the battery 21a, and a second switch SW12a connected in parallel to the battery 21a and the first switch SW11a. In the first switch SW11a, one end T11 is connected to one pole (for example, a positive electrode) of the battery 21a. In the second switch SW12a, one end T21 is connected to the other electrode (for example, the negative electrode) of the battery 21a, and the other end T22 is connected to the other end T12 of the first switch SW11a. Since the switching units 41b and 41c can be described by replacing "a" in the above-described explanation of the switching unit 41a with "b" and "c", respectively, detailed description thereof will be omitted.

切替部４２ａは、電池２２ａに直列接続された第１スイッチＳＷ２１ａと、電池２２ａ及び第１スイッチＳＷ２１ａに並列接続された第２スイッチＳＷ２２ａと、から構成されている。第１スイッチＳＷ２１ａは、一端Ｔ１１が電池２２ａの一極（例えば正極）に接続されている。第２スイッチＳＷ２２ａは、一端Ｔ２１が電池２２ａの他極（例えば負極）に接続され、その他端Ｔ２２が第１スイッチＳＷ２１ａの他端Ｔ１２に接続されている。切替部４２ｂ、４２ｃについては、上述した切替部４２ａについての説明中の「ａ」を「ｂ」、「ｃ」にそれぞれ置き換えて説明することができるため、詳細な説明を省略する。 The switching unit 42a includes a first switch SW21a connected in series to the battery 22a, and a second switch SW22a connected in parallel to the battery 22a and the first switch SW21a. In the first switch SW21a, one end T11 is connected to one pole (for example, a positive electrode) of the battery 22a. In the second switch SW22a, one end T21 is connected to the other electrode (for example, the negative electrode) of the battery 22a, and the other end T22 is connected to the other end T12 of the first switch SW21a. Since the switching units 42b and 42c can be described by replacing "a" in the above-described explanation of the switching unit 42a with "b" and "c", respectively, detailed description thereof will be omitted.

また、第１スイッチＳＷ１１ｂの他端Ｔ１２は、電池２１ａの負極に接続され、第１スイッチＳＷ１１ｃの他端Ｔ１２は、電池２１ｂの負極に接続されている。即ち、互いに隣接する電池２１ａ−電池２１ｂ間、電池２１ｂ−電池２１ｃ間にそれぞれ、第１スイッチＳＷ１１ｂ、ＳＷ１１ｃが接続されている。 Further, the other end T12 of the first switch SW11b is connected to the negative electrode of the battery 21a, and the other end T12 of the first switch SW11c is connected to the negative electrode of the battery 21b. That is, the first switches SW11b and SW11c are connected between the batteries 21a and the batteries 21b and between the batteries 21b and the batteries 21c, which are adjacent to each other, respectively.

また、第１スイッチＳＷ２１ｂの他端Ｔ１２は、電池２２ａの負極に接続され、第１スイッチＳＷ２１ｃの他端Ｔ１２は、電池２２ｂの負極に接続されている。即ち、互いに隣接する電池２２ａ−電池２２ｂ間、電池２２ｂ−電池２２ｃ間にそれぞれ、第１スイッチＳＷ２１ｂ、ＳＷ２１ｃが接続されている。 Further, the other end T12 of the first switch SW21b is connected to the negative electrode of the battery 22a, and the other end T12 of the first switch SW21c is connected to the negative electrode of the battery 22b. That is, the first switches SW21b and SW21c are connected between the batteries 22a and the batteries 22b and between the batteries 22b and the batteries 22c, which are adjacent to each other, respectively.

以上の構成によれば、第２スイッチＳＷ１２ａ〜ＳＷ１２ｃ、ＳＷ２２ａ〜ＳＷ２２ｃをオフし、第１スイッチＳＷ１１ａ〜ＳＷ１１ｃ、ＳＷ２１ａ〜ＳＷ２１ｃをオンすると、対応する電池２１ａ〜２１ｃ、２２ａ〜２２ｃが接続状態となる。また、第１スイッチＳＷ１１ａ〜ＳＷ１１ｃ、ＳＷ２１ａ〜ＳＷ２１ｃをオフすると対応する電池２１ａ〜２１ｃ、２２ａ〜２２ｃが非接続状態となる。このとき、第２スイッチＳＷ１２ａ〜ＳＷ１２ｃ、ＳＷ２２ａ〜ＳＷ２２ｃをオンするとバイパス経路が形成され、接続状態となっている電池２１ａ〜２１ｃ、２２ａ〜２２ｃのみが直列に接続される。 According to the above configuration, when the second switches SW12a to SW12c and SW22a to SW22c are turned off and the first switches SW11a to SW11c and SW21a to SW21c are turned on, the corresponding batteries 21a to 21c and 22a to 22c are connected. .. Further, when the first switches SW11a to SW11c and SW21a to SW21c are turned off, the corresponding batteries 21a to 21c and 22a to 22c are disconnected. At this time, when the second switches SW12a to SW12c and SW22a to SW22c are turned on, a bypass path is formed, and only the connected batteries 21a to 21c and 22a to 22c are connected in series.

複数の電圧測定部５１ａ〜５１ｃ、５２ａ〜５２ｃは、複数の電池２１ａ〜２１ｃ、２２ａ〜２２ｃに各々対応して設けられている。複数の電圧測定部５１ａ〜５１ｃ、５２ａ〜５２ｃは、対応する電池２１ａ〜２１ｃ、２２ａ〜２２ｃの両端電圧を測定して、その測定結果を後述する制御部８に対して出力する。 The plurality of voltage measuring units 51a to 51c and 52a to 52c are provided corresponding to the plurality of batteries 21a to 21c and 22a to 22c, respectively. The plurality of voltage measuring units 51a to 51c and 52a to 52c measure the voltages across the corresponding batteries 21a to 21c and 22a to 22c, and output the measurement results to the control unit 8 described later.

充放電制限部６１、６２は、２つの組電池２１、２２に各々対応して設けられている。充放電制限部６１は、ダイオードＤ１と、スイッチＳＷ１と、を有している。ダイオードＤ１は、電池放電方向が順方向となるように、組電池２１に直列接続される。スイッチＳＷ１は、組電池２１に直列接続されると共に、ダイオードＤ１に並列接続される。 The charge / discharge limiting units 61 and 62 are provided corresponding to the two assembled batteries 21 and 22, respectively. The charge / discharge limiting unit 61 includes a diode D1 and a switch SW1. The diode D1 is connected in series to the assembled battery 21 so that the battery discharge direction is the forward direction. The switch SW1 is connected in series to the assembled battery 21 and also connected in parallel to the diode D1.

上述した構成によれば、スイッチＳＷ１をオフすると、組電池２１にダイオードＤ１が接続され、他の組電池２２から組電池２１に対して流れ込む循環電流を遮断することができる。スイッチＳＷ１をオンすると、ダイオードＤ１がバイパスされる。 According to the above-described configuration, when the switch SW1 is turned off, the diode D1 is connected to the assembled battery 21 and the circulating current flowing from the other assembled battery 22 into the assembled battery 21 can be cut off. When the switch SW1 is turned on, the diode D1 is bypassed.

充放電制限部６２は、ダイオードＤ２と、スイッチＳＷ２と、を有している。ダイオードＤ２は、電池放電方向が順方向となるように、組電池２２に直列接続される。スイッチＳＷ２は、組電池２２に直列接続されると共に、ダイオードＤ２に並列接続される。 The charge / discharge limiting unit 62 includes a diode D2 and a switch SW2. The diode D2 is connected in series to the assembled battery 22 so that the battery discharge direction is the forward direction. The switch SW2 is connected in series to the assembled battery 22 and also connected in parallel to the diode D2.

上述した構成によれば、スイッチＳＷ２をオフすると、組電池２２にダイオードＤ２が接続され、他の組電池２１から組電池２２に対して流れ込む循環電流を遮断することができる。スイッチＳＷ２をオンすると、ダイオードＤ２がバイパスされる。 According to the above-described configuration, when the switch SW2 is turned off, the diode D2 is connected to the assembled battery 22 and the circulating current flowing from the other assembled battery 21 into the assembled battery 22 can be cut off. When the switch SW2 is turned on, the diode D2 is bypassed.

制御部８は、周知のＣＰＵ、ＲＯＭ、ＲＡＭから構成され、電池システム１全体の制御を司る。制御部８は、第１制御部として機能し、各電池２１ａ〜２１ｃ、２２ａ〜２２ｃの両端電圧に基づいて第１スイッチＳＷ１１ａ〜ＳＷ１１ｃ、ＳＷ２１ａ〜ＳＷ２１ｃ及び第２スイッチＳＷ１２ａ〜ＳＷ１２ｃ、ＳＷ２２ａ〜ＳＷ２２ｃをオンオフ制御する。詳しく説明すると、制御部８は、放電時又は充電時に放電終止電圧又は充電終止電圧に達した電池２１ａ〜２１ｃ、２２ａ〜２２ｃを非接続状態としてバイパスさせる。 The control unit 8 is composed of a well-known CPU, ROM, and RAM, and controls the entire battery system 1. The control unit 8 functions as a first control unit, and sets the first switches SW11a to SW11c, SW21a to SW21c, and the second switches SW12a to SW12c, SW22a to SW22c based on the voltages across the batteries 21a to 21c and 22a to 22c. On / off control. More specifically, the control unit 8 bypasses the batteries 21a to 21c and 22a to 22c that have reached the discharge end voltage or the charge end voltage at the time of discharging or charging in a disconnected state.

また、制御部８は、複数の組電池２１、２２の総電圧が同等になるように、放電終止電圧又は充電終止電圧に達していない電池２１ａ〜２１ｃ、２２ａ〜２２ｃの切替部４１ａ〜４１ｃ、４２ａ〜４２ｃを非接続状態に制御する。この制御について簡単に説明する。まず、充電時における制御部８の動作について説明する。 Further, the control unit 8 has switching units 41a to 41c of the batteries 21a to 21c and 22a to 22c that have not reached the discharge end voltage or the charge end voltage so that the total voltages of the plurality of assembled batteries 21 and 22 are equal. Controls 42a to 42c in a disconnected state. This control will be briefly described. First, the operation of the control unit 8 during charging will be described.

まず、制御部８は、電圧測定部５１ａ〜５１ｃ、５２ａ〜５２ｃからの測定結果を取り込んで、組電池２１、２２の全電池２１ａ〜２１ｃ、２２ａ〜２２ｃをバイパスさせずに使用した場合の総電圧を比較する。組電池２１、２２の総電圧とは、組電池２１、２２のうち接続状態となる電池２１ａ〜２１ｃ、２２ａ〜２２ｃの両端電圧の合計である。即ち、制御部８は、全電池２１ａ〜２１ｃの両端電圧の合計値を組電池２１の総電圧として求め、全電池２２ａ〜２２ｃの両端電圧の合計値を組電池２２の総電圧として求める。そして、制御部８は、求めた組電池２１、２２の総電圧を比較する。 First, the control unit 8 takes in the measurement results from the voltage measuring units 51a to 51c and 52a to 52c, and uses all the batteries 21a to 21c and 22a to 22c of the assembled batteries 21 and 22 without bypassing them. Compare the voltages. The total voltage of the assembled batteries 21 and 22 is the total voltage across the batteries 21a to 21c and 22a to 22c in the connected state among the assembled batteries 21 and 22. That is, the control unit 8 obtains the total value of the voltages across the batteries 21a to 21c as the total voltage of the assembled batteries 21, and obtains the total value of the voltages across the batteries 22a to 22c as the total voltage of the assembled batteries 22. Then, the control unit 8 compares the obtained total voltages of the assembled batteries 21 and 22.

このとき、組電池２１、２２の総電圧が同等であれば、両組電池２１、２２に対して充電電流が流れ、循環電流が流れることはない。制御部８は、組電池２１、２２に直列接続されたスイッチＳＷ１、ＳＷ２をオンして、ダイオードＤ１、Ｄ２をバイパスさせる。これにより、組電池２１、２２の充電電流はオンしたスイッチＳＷ１、ＳＷ２に流れるため、ダイオードＤ１、Ｄ２で発生する順方向電圧Ｖｆによる損失が発生しない。 At this time, if the total voltages of the assembled batteries 21 and 22 are the same, the charging current flows through both the assembled batteries 21 and 22, and the circulating current does not flow. The control unit 8 turns on the switches SW1 and SW2 connected in series to the assembled batteries 21 and 22 to bypass the diodes D1 and D2. As a result, the charging current of the assembled batteries 21 and 22 flows through the switches SW1 and SW2 that are turned on, so that the loss due to the forward voltage Vf generated by the diodes D1 and D2 does not occur.

なお、制御部８は、組電池２１、２２の総電圧の差分がΔＶａ（一定値）以内であれば、同等であると判定する。今、電池内部抵抗や各種デバイスの抵抗成分をＲＬとすると、循環電流ＩＬは下記の式（１）で求められる。
ＩＬ＝ΔＶａ／ＲＬ …（１） If the difference between the total voltages of the assembled batteries 21 and 22 is within ΔVa (constant value), the control unit 8 determines that they are equivalent. Now, assuming that the internal resistance of the battery and the resistance component of various devices are RL, the circulating current IL can be calculated by the following equation (1).
IL = ΔVa / RL ... (1)

この循環電流ＩＬが、下記の式（２）に示すように、電池２１ａ〜２１ｃ、２２ａ〜２２ｃの定格電流Ｉを超えないような範囲でΔＶａが決定される。
Ｉ＞ＩＬ …（２） As shown in the following formula (2), ΔVa is determined in a range in which the circulating current IL does not exceed the rated currents I of the batteries 21a to 21c and 22a to 22c.
I> IL ... (2)

一方、組電池２１、２２の総電圧が同等でなければ、制御部８は、充電終止電圧に達していない電池２１ａ〜２１ｃ、電池２２ａ〜２２ｃのうち、非接続状態に制御するものの組み合わせを設定する。本実施形態では、制御部８は、全ての組み合わせを設定する。その後、制御部８は、組み合わせ毎に複数の組電池２１、２２の総電圧を求め、複数の組電池２１、２２の総電圧が同等となる組み合わせに従って切替部４１ａ〜４１ｃ、４２ａ〜４２ｃを制御する。 On the other hand, if the total voltages of the assembled batteries 21 and 22 are not equal, the control unit 8 sets a combination of the batteries 21a to 21c and the batteries 22a to 22c that have not reached the end-of-charge voltage and are controlled to be disconnected. To do. In this embodiment, the control unit 8 sets all combinations. After that, the control unit 8 obtains the total voltage of the plurality of assembled batteries 21 and 22 for each combination, and controls the switching units 41a to 41c and 42a to 42c according to the combination in which the total voltages of the plurality of assembled batteries 21 and 22 are equal. To do.

具体的な例を挙げて説明する。今、電池２１ａが充電終止電圧に達していたとする。この場合、電池２１ｂ、２１ｃ、２２ａ〜２２ｃが充電終止電圧に達していない。制御部８は、この電池２１ｂ、２１ｃ、２２ａ〜２２ｃのうち非接続状態とする組み合わせを設定する。組み合わせとして、例えば、電池２２ａを非接続状態とする組み合わせＡと、電池２２ｂを非接続状態とする組み合わせＢが設定されたとする。制御部８は、組み合わせＡ、Ｂにおいて接続状態となる電池２１ｂ、２１ｃの両端電圧の合計値を組み合わせＡ、Ｂでの組電池２１の総電圧として求める。 A specific example will be described. It is assumed that the battery 21a has reached the end-of-charge voltage. In this case, the batteries 21b, 21c, 22a to 22c have not reached the end-of-charge voltage. The control unit 8 sets a combination of the batteries 21b, 21c, 22a to 22c to be disconnected. As a combination, for example, it is assumed that a combination A in which the battery 22a is in the non-connected state and a combination B in which the battery 22b is in the non-connected state are set. The control unit 8 obtains the total value of the voltages across the batteries 21b and 21c in the connected state in the combinations A and B as the total voltage of the assembled batteries 21 in the combinations A and B.

また、制御部８は、組み合わせＡにおいて接続状態となる電池２２ｂ、２２ｃの両端電圧の合計値を組み合わせＡでの組電池２２の総電圧として求め、組み合わせＢにおいて接続状態となる電池２１ａ、２１ｃの両端電圧の合計値を組み合わせＢでの組電池２２の総電圧として求める。そして、制御部８は、組み合わせＡ、Ｂでの組電池２１、２２の総電圧が同等であるか否かを判定する。制御部８は、組み合わせＡでの組電池２１、２２の総電圧が同等であると判定すると、組み合わせＡに従って充電終止に達していない電池２２ａを非接続状態にし、電池２１ｂ、２１ｃ、２２ｂ、２２ｃを接続状態に制御する。電池２１ａは、充電終止電圧に達しているため非接続状態に制御される。 Further, the control unit 8 obtains the total value of the voltages across the batteries 22b and 22c in the combination A as the total voltage of the assembled batteries 22 in the combination A, and determines the total voltage of the batteries 21a and 21c in the connection state in the combination B. The total value of the voltages across the ends is calculated as the total voltage of the assembled battery 22 in the combination B. Then, the control unit 8 determines whether or not the total voltages of the assembled batteries 21 and 22 in the combinations A and B are equivalent. When the control unit 8 determines that the total voltages of the assembled batteries 21 and 22 in the combination A are the same, the control unit 8 disconnects the batteries 22a that have not reached the end of charging according to the combination A, and the batteries 21b, 21c, 22b, 22c. Is controlled to the connected state. Since the battery 21a has reached the end-of-charge voltage, it is controlled to be in a non-connected state.

一方、制御部８は、例えば、全ての組み合わせのうち組み合わせＡ、Ｂの双方とも組電池２１、２２の総電圧が同等であれば、各組み合わせＡ、Ｂにおける組電池２１、２２の充電電力を求める。制御部８は、組み合わせＡ、Ｂのうち充電電力が最大となる組み合わせに従って、電池２１ａ〜２１ｃ、２２ａ〜２２ｃの非接続状態、接続状態を制御する。なお、組み合わせＡ、Ｂにおける組電池２１、２２の充電電力は、例えば、組み合わせＡにおける組電池２１、２２の「総電圧」と、組み合わせＡ、Ｂにおいて接続状態となる電池２１ａ〜２１ｃ、２２ａ〜２２ｃの現ＳＯＣ状態における「許容最大充電電流」と、の積として求めることができる。 On the other hand, if the total voltage of the assembled batteries 21 and 22 is the same for both the combinations A and B among all the combinations, the control unit 8 can use the charging power of the assembled batteries 21 and 22 in the respective combinations A and B. Ask. The control unit 8 controls the non-connected state and the connected state of the batteries 21a to 21c and 22a to 22c according to the combination of the combinations A and B that maximizes the charging power. The charging power of the assembled batteries 21 and 22 in the combinations A and B is, for example, the "total voltage" of the assembled batteries 21 and 22 in the combination A and the batteries 21a to 21c and 22a to be connected in the combinations A and B. It can be calculated as the product of the "allowable maximum charging current" in the current SOC state of 22c.

このように、組電池２１、２２の総電圧が同等となる組み合わせで、電池２１ａ〜２１ｃ、２２ａ〜２２ｃの非接続状態、接続状態を制御すれば、両組電池２１、２２に充電電流が供給され、循環電流が流れることはない。制御部８は、組電池２１、２２に直列接続されたスイッチＳＷ１、ＳＷ２をオンして、ダイオードＤ１、Ｄ２をバイパスさせる。これにより、組電池２１、２２の充電電流はオンしたスイッチＳＷ１、ＳＷ２に流れるため、ダイオードＤ１、Ｄ２で発生する順方向電圧Ｖｆによる損失が発生しない。 In this way, if the non-connected state and the connected state of the batteries 21a to 21c and 22a to 22c are controlled by the combination in which the total voltages of the assembled batteries 21 and 22 are equal, the charging current is supplied to both the assembled batteries 21 and 22. And no circulating current flows. The control unit 8 turns on the switches SW1 and SW2 connected in series to the assembled batteries 21 and 22 to bypass the diodes D1 and D2. As a result, the charging current of the assembled batteries 21 and 22 flows through the switches SW1 and SW2 that are turned on, so that the loss due to the forward voltage Vf generated by the diodes D1 and D2 does not occur.

また、制御部８は、同等となる組み合わせ毎に、充電電力を求めて、求めた充電電力が最大となる組み合わせの電池を非接続状態に制御する。これにより、充電電力を最大とすることができ、より一層、充電の効率の向上を図ることができる。 Further, the control unit 8 obtains charging power for each equivalent combination, and controls the battery of the combination having the maximum obtained charging power in a non-connected state. As a result, the charging power can be maximized, and the charging efficiency can be further improved.

次に、放電時における制御部８の動作について簡単に説明する。まず、制御部８は、電圧測定部５１ａ〜５１ｃ、５２ａ〜５２ｃからの測定結果を取り込んで、組電池２１、２２の全電池２１ａ〜２１ｃ、２２ａ〜２２ｃをバイパスさせずに使用した場合の総電圧を比較する。総電圧は、組電池２１、２２のうち接続状態となる電池２１ａ〜２１ｃ、２２ａ〜２２ｃの両端電圧の合計である。即ち、制御部８は、全電池２１ａ〜２１ｃの両端電圧の合計値を組電池２１の総電圧として求め、全電池２２ａ〜２２ｃの両端電圧の合計値を組電池２２の総電圧として求める。そして、制御部８は、求めた組電池２１、２２の総電圧を比較する。 Next, the operation of the control unit 8 at the time of discharging will be briefly described. First, the control unit 8 takes in the measurement results from the voltage measuring units 51a to 51c and 52a to 52c, and uses all the batteries 21a to 21c and 22a to 22c of the assembled batteries 21 and 22 without bypassing them. Compare the voltages. The total voltage is the total voltage across the batteries 21a to 21c and 22a to 22c in the connected state among the assembled batteries 21 and 22. That is, the control unit 8 obtains the total value of the voltages across the batteries 21a to 21c as the total voltage of the assembled batteries 21, and obtains the total value of the voltages across the batteries 22a to 22c as the total voltage of the assembled batteries 22. Then, the control unit 8 compares the obtained total voltages of the assembled batteries 21 and 22.

このとき、組電池２１、２２の総電圧が同等であれば、両組電池２１、２２から負荷１０に対して放電電流が流れ、循環電流が流れることはない。制御部８は、組電池２１、２２に直列接続されたスイッチＳＷ１、ＳＷ２をオンして、ダイオードＤ１、Ｄ２をバイパスさせる。これにより、組電池２１、２２の放電電流はオンしたスイッチＳＷ１、ＳＷ２に流れるため、ダイオードＤ１、Ｄ２で発生する順方向電圧Ｖｆによる損失が発生しない。なお、制御部８は、充電時と同様に、組電池２１、２２の総電圧の差分がΔＶａ（一定値）以内であれば、同等であると判定する。 At this time, if the total voltages of the assembled batteries 21 and 22 are the same, a discharge current flows from both assembled batteries 21 and 22 to the load 10, and no circulating current flows. The control unit 8 turns on the switches SW1 and SW2 connected in series to the assembled batteries 21 and 22 to bypass the diodes D1 and D2. As a result, the discharge currents of the assembled batteries 21 and 22 flow to the switches SW1 and SW2 that are turned on, so that the loss due to the forward voltage Vf generated by the diodes D1 and D2 does not occur. The control unit 8 determines that the batteries are equivalent if the difference between the total voltages of the assembled batteries 21 and 22 is within ΔVa (constant value), as in the case of charging.

一方、組電池２１、２２の総電圧が同等でなければ、制御部８は、放電終止電圧に達していない電池２１ａ〜２１ｃ、電池２２ａ〜２２ｃのうち、非接続状態に制御するものの組み合わせを設定する。本実施形態では、制御部８は、全ての組み合わせを設定する。その後、制御部８は、全ての組み合わせ毎に複数の組電池２１、２２の総電圧を求め、複数の組電池２１、２２の総電圧が同等となる組み合わせの電池２１ａ〜２１ｃ、２２ａ〜２２ｃを非接続状態に制御する。 On the other hand, if the total voltages of the assembled batteries 21 and 22 are not equal, the control unit 8 sets a combination of the batteries 21a to 21c and the batteries 22a to 22c that have not reached the discharge end voltage and are controlled to be in the non-connected state. To do. In this embodiment, the control unit 8 sets all combinations. After that, the control unit 8 obtains the total voltage of the plurality of assembled batteries 21 and 22 for each combination, and uses the batteries 21a to 21c and 22a to 22c of the combinations in which the total voltages of the plurality of assembled batteries 21 and 22 are equal. Control to disconnect state.

一方、制御部８は、全ての組み合わせのうち組電池２１、２２の総電圧が同等のものが複数あれば、同等の組み合わせのうち組電池２１、２２の総電圧が最大となる組み合わせに従って、電池２１ａ〜２１ｃ、２２ａ〜２２ｃの非接続状態、接続状態を制御する。 On the other hand, if there are a plurality of all combinations having the same total voltage of the assembled batteries 21 and 22, the control unit 8 is charged according to the combination in which the total voltage of the assembled batteries 21 and 22 is maximized among the equivalent combinations. Controls the non-connected state and the connected state of 21a to 21c and 22a to 22c.

このように、組電池２１、２２の総電圧が同等となる組み合わせで、電池２１ａ〜２１ｃ、２２ａ〜２２ｃの非接続状態、接続状態を制御すれば、両組電池２１、２２から負荷１０に対して放電電流が流れ、循環電流が流れることはない。制御部８は、組電池２１、２２に直列接続されたスイッチＳＷ１、ＳＷ２をオンして、ダイオードＤ１、Ｄ２をバイパスさせる。これにより、組電池２１、２２の放電電流はオンしたスイッチＳＷ１、ＳＷ２に流れるため、ダイオードＤ１、Ｄ２で発生する順方向電圧Ｖｆによる損失が発生しない。 In this way, if the non-connected state and the connected state of the batteries 21a to 21c and 22a to 22c are controlled by a combination in which the total voltages of the assembled batteries 21 and 22 are the same, the combined batteries 21 and 22 can be used with respect to the load 10. The discharge current flows, and the circulating current does not flow. The control unit 8 turns on the switches SW1 and SW2 connected in series to the assembled batteries 21 and 22 to bypass the diodes D1 and D2. As a result, the discharge currents of the assembled batteries 21 and 22 flow to the switches SW1 and SW2 that are turned on, so that the loss due to the forward voltage Vf generated by the diodes D1 and D2 does not occur.

また、制御部８は、同等となる組み合わせのうち組電池２１、２２の総電圧が最大となる組み合わせの電池２１ａ〜２１ｃ、２２ａ〜２２ｃを非接続状態に制御する。総電圧は組電池２１、２２の放電電力にほぼ比例する値である。これにより、放電電力を最大とすることができ、より一層、放電の効率の向上を図ることができる。 Further, the control unit 8 controls the batteries 21a to 21c and 22a to 22c of the combination having the maximum total voltage of the assembled batteries 21 and 22 in the non-connected state among the equivalent combinations. The total voltage is a value substantially proportional to the discharge power of the assembled batteries 21 and 22. As a result, the discharge power can be maximized, and the discharge efficiency can be further improved.

次に、上記概略で説明した電池システム１の充電時の動作について図２を参照して説明する。図２は、図１に示す制御部８の充電処理手順を示すフローチャートである。制御部８は、外部システムなどから充電信号を受信すると充電処理を実行する。まず、制御部８は、全第１スイッチＳＷ１１ａ〜ＳＷ１１ｃ、ＳＷ２１ａ〜ＳＷ２１ｃ、全第２スイッチＳＷ１２ａ〜ＳＷ１２ｃ、ＳＷ２２ａ〜ＳＷ２２ｃ、スイッチＳＷ１、ＳＷ２をオフにする（ステップＳ１）。その後、制御部８は、全第１スイッチＳＷ１１ａ〜ＳＷ１１ｃ、ＳＷ２１ａ〜ＳＷ２１ｃをオンする（ステップＳ２）。 Next, the operation of the battery system 1 described in the above outline during charging will be described with reference to FIG. FIG. 2 is a flowchart showing a charging processing procedure of the control unit 8 shown in FIG. When the control unit 8 receives a charging signal from an external system or the like, the control unit 8 executes the charging process. First, the control unit 8 turns off all the first switches SW11a to SW11c, SW21a to SW21c, all the second switches SW12a to SW12c, SW22a to SW22c, and the switches SW1 and SW2 (step S1). After that, the control unit 8 turns on all the first switches SW11a to SW11c and SW21a to SW21c (step S2).

次に、制御部８は、充電終止電圧に達していない電池２１ａ〜２１ｃ、２２ａ〜２２ｃのうち、非接続状態に制御するものの組み合わせを設定し、設定した組み合わせのうち組電池２１、２２の総電圧が等しく、かつ、充電電力が最も高い組み合わせを１つ選ぶ（ステップＳ３）。なお、充電処理の開始から最初にステップＳ３に進んだ場合、制御部８は、全ての電池２１ａ〜２１ｃ、２２ａ〜２２ｃが充電終止電圧に達していないとして、組み合わせを設定する。そのときの組み合わせの１つとして、非接続状態に制御する電池２１ａ〜２１ｃ、２２ａ〜２２ｃがないもの(全ての電池２１ａ〜２１ｃ、２２ａ〜２２ｃをバイパスしない組み合わせ)も含まれる。 Next, the control unit 8 sets a combination of batteries 21a to 21c and 22a to 22c that have not reached the end-of-charge voltage and controls the non-connected state, and the total of the assembled batteries 21 and 22 among the set combinations. Select one combination having the same voltage and the highest charging power (step S3). When the process first proceeds to step S3 from the start of the charging process, the control unit 8 sets the combination on the assumption that all the batteries 21a to 21c and 22a to 22c have not reached the charging end voltage. As one of the combinations at that time, those without batteries 21a to 21c and 22a to 22c to be controlled in the disconnected state (combinations that do not bypass all the batteries 21a to 21c and 22a to 22c) are also included.

その後、制御部８は、充電終止電圧に達していない電池２１ａ〜２１ｃ、２２ａ〜２２ｃが、ステップＳ３で選択した組み合わせに従ったバイパス状態となるように切替部４１ａ〜４１ｃ、４２ａ〜４２ｃを制御する（ステップＳ４）。次に、制御部８は、スイッチＳＷ１、ＳＷ２をオンしたダイオードＤ１、Ｄ２をバイパスさせ（ステップＳ５）、組電池２１、２２に充電器４０を接続して充電を開始する（ステップＳ６）。 After that, the control unit 8 controls the switching units 41a to 41c and 42a to 42c so that the batteries 21a to 21c and 22a to 22c that have not reached the final charge voltage are in the bypass state according to the combination selected in step S3. (Step S4). Next, the control unit 8 bypasses the diodes D1 and D2 in which the switches SW1 and SW2 are turned on (step S5), connects the charger 40 to the assembled batteries 21 and 22, and starts charging (step S6).

次に、制御部８は、各組電池２１、２２に流れる充電電流を計測し、計測した各充電電流が「許容最大充電電流」以下になるように充電電流を制御する（ステップＳ７）。具体的には、制御部８は、充電電流が「許容最大充電電流」を超えると、充電器４０の出力電圧を低下させる。 Next, the control unit 8 measures the charging current flowing through each of the assembled batteries 21 and 22, and controls the charging current so that each measured charging current is equal to or less than the “allowable maximum charging current” (step S7). Specifically, the control unit 8 lowers the output voltage of the charger 40 when the charging current exceeds the “allowable maximum charging current”.

その後、制御部８は、電圧測定部５１ａ〜５１ｃ、５２ａ〜５２ｃにより測定された電池２１ａ〜２１ｃ、２２ａ〜２２ｃを取り込み、充電終止電圧に達した電池２１ａ〜２１ｃ、２２ａ〜２２ｃがあるか否かを判定する（ステップＳ８）。充電終止電圧に達した電池２１ａ〜２１ｃ、２２ａ〜２２ｃがなければ（ステップＳ８でＮ）、制御部８は、ステップＳ３に戻る。 After that, the control unit 8 takes in the batteries 21a to 21c and 22a to 22c measured by the voltage measuring units 51a to 51c and 52a to 52c, and whether or not there are batteries 21a to 21c and 22a to 22c that have reached the end-of-charge voltage. (Step S8). If there are no batteries 21a to 21c and 22a to 22c that have reached the end-of-charge voltage (N in step S8), the control unit 8 returns to step S3.

一方、充電終止電圧に達した電池２１ａ〜２１ｃ、２２ａ〜２２ｃがあれば（ステップＳ８でＹ）、制御部８は、全電池２１ａ〜２１ｃ、２２ａ〜２２ｃが充電終止電圧に達したか否かを判定する（ステップＳ９）。全電池２１ａ〜２１ｃ、２２ａ〜２２ｃが充電終止電圧に達してなければ（ステップＳ９でＮ）、制御部８は、充電終止電圧に達したと判定された電池２１ａ〜２１ｃ、２２ａ〜２２ｃに対応する第１スイッチＳＷ１１ａ〜ＳＷ１１ｃ、ＳＷ２１ａ〜ＳＷ２１ｃをオフ、第２スイッチＳＷ１２ａ〜ＳＷ１２ｃ、ＳＷ２２ａ〜ＳＷ２２ｃをオンして、充電終止電圧に達した電池２１ａ〜２１ｃ、２２ａ〜２２ｃをバイパスした後（ステップＳ１０）、ステップＳ３に戻る。 On the other hand, if there are batteries 21a to 21c and 22a to 22c that have reached the end-of-charge voltage (Y in step S8), the control unit 8 determines whether or not all the batteries 21a to 21c and 22a to 22c have reached the end-of-charge voltage. Is determined (step S9). If all the batteries 21a to 21c and 22a to 22c have not reached the end-of-charge voltage (N in step S9), the control unit 8 corresponds to the batteries 21a to 21c and 22a to 22c determined to have reached the end-of-charge voltage. After turning off the first switches SW11a to SW11c and SW21a to SW21c and turning on the second switches SW12a to SW12c and SW22a to SW22c to bypass the batteries 21a to 21c and 22a to 22c that have reached the end-of-charge voltage (step S10). ), Return to step S3.

なお、ステップＳ３〜Ｓ６は、毎回、実行されなくてもよい。例えば、制御部８は、組電池２１、２２の総電圧が前回のステップＳ３の実行時に比べて一定値以上変化した場合のみ、ステップＳ３〜Ｓ６を実行するようにしてもよい。これにより、電池２１ａ〜２１ｃ、２２ａ〜２２ｃのバイパス状態の変更が頻繁に行われることを避けることができる。 It should be noted that steps S3 to S6 do not have to be executed each time. For example, the control unit 8 may execute steps S3 to S6 only when the total voltage of the assembled batteries 21 and 22 changes by a certain value or more as compared with the execution of the previous step S3. As a result, it is possible to avoid frequent changes in the bypass state of the batteries 21a to 21c and 22a to 22c.

また、全ての電池２１ａ〜２１ｃ、２２ａ〜２２ｃが充電終止電圧に達していれば（ステップＳ９でＹ）、制御部８は、充電を停止すると共に（ステップＳ１１）、全第１スイッチＳＷ１１ａ〜ＳＷ１１ｃ、ＳＷ２１ａ〜ＳＷ２１ｃ、全第２スイッチＳＷ１２ａ〜ＳＷ１２ｃ、ＳＷ２２ａ〜ＳＷ２２ｃ、スイッチＳＷ１、ＳＷ２をオフする（ステップＳ１２）。その後、制御部８は、全第１スイッチＳＷ１１ａ〜ＳＷ１１ｃ、ＳＷ２１ａ〜ＳＷ２１ｃをオンした後（ステップＳ１３）、充電処理を終了する。 If all the batteries 21a to 21c and 22a to 22c have reached the end-of-charge voltage (Y in step S9), the control unit 8 stops charging (step S11) and all the first switches SW11a to SW11c. , SW21a to SW21c, all second switches SW12a to SW12c, SW22a to SW22c, switches SW1 and SW2 are turned off (step S12). After that, the control unit 8 ends the charging process after turning on all the first switches SW11a to SW11c and SW21a to SW21c (step S13).

次に、上記概略で説明した電池システム１の放電時の動作について図３を参照して説明する。図３は、図１に示す制御部８の放電処理手順を示すフローチャートである。なお、図３において、上述した図２と同等のステップについては、同一符号を付してその詳細な説明を省略する。制御部８は、充電処理と同様にステップＳ１、Ｓ２を実行する。 Next, the operation of the battery system 1 described in the above outline at the time of discharge will be described with reference to FIG. FIG. 3 is a flowchart showing a discharge processing procedure of the control unit 8 shown in FIG. In FIG. 3, the same steps as those in FIG. 2 described above are designated by the same reference numerals, and detailed description thereof will be omitted. The control unit 8 executes steps S1 and S2 in the same manner as in the charging process.

次に、制御部８は、放電終止電圧に達していない電池２１ａ〜２１ｃ、２２ａ〜２２ｃのうち、非接続状態に制御するものの組み合わせを設定し、設定した組み合わせのうち組電池２１、２２の総電圧が等しく、かつ、総電圧が最も高い組み合わせを１つ選ぶ（ステップＳ２１）。なお、放電開始から最初にステップＳ２１に進んだ場合、制御部８は、全ての電池２１ａ〜２１ｃ、２２ａ〜２２ｃが放電終止電圧に達していないとして、組み合わせを設定する。そのときの組み合わせの１つとして、非接続状態に制御する電池２１ａ〜２１ｃ、２２ａ〜２２ｃがないもの(全ての電池２１ａ〜２１ｃ、２２ａ〜２２ｃをバイパスしない組み合わせ)も含まれる。 Next, the control unit 8 sets a combination of the batteries 21a to 21c and 22a to 22c that have not reached the discharge end voltage and controls the non-connection state, and the total of the assembled batteries 21 and 22 among the set combinations. Select one combination having the same voltage and the highest total voltage (step S21). When the process first proceeds to step S21 from the start of discharge, the control unit 8 sets the combination on the assumption that all the batteries 21a to 21c and 22a to 22c have not reached the discharge end voltage. As one of the combinations at that time, those without batteries 21a to 21c and 22a to 22c to be controlled in the disconnected state (combinations that do not bypass all the batteries 21a to 21c and 22a to 22c) are also included.

その後、制御部８は、放電終止電圧に達していない電池２１ａ〜２１ｃ、２２ａ〜２２ｃが、ステップＳ２１で選択した組み合わせに従ったバイパス状態となるように切替部４１ａ〜４１ｃ、４２ａ〜４２ｃを制御する（ステップＳ２２）。次に、制御部８は、スイッチＳＷ１、ＳＷ２をオンしたダイオードＤ１、Ｄ２をバイパスさせ（ステップＳ２３）、放電を開始する（ステップＳ２４）。 After that, the control unit 8 controls the switching units 41a to 41c and 42a to 42c so that the batteries 21a to 21c and 22a to 22c that have not reached the discharge end voltage are in the bypass state according to the combination selected in step S21. (Step S22). Next, the control unit 8 bypasses the diodes D1 and D2 in which the switches SW1 and SW2 are turned on (step S23), and starts discharging (step S24).

その後、制御部８は、電圧測定部５１ａ〜５１ｃ、５２ａ〜５２ｃにより測定された電池２１ａ〜２１ｃ、２２ａ〜２２ｃを取り込み、放電終止電圧に達した電池２１ａ〜２１ｃ、２２ａ〜２２ｃがあるか否かを判定する（ステップＳ２５）。放電終止電圧に達した電池２１ａ〜２１ｃ、２２ａ〜２２ｃがなければ（ステップＳ２６でＮ）、制御部８は、ステップＳ２１に戻る。 After that, the control unit 8 takes in the batteries 21a to 21c and 22a to 22c measured by the voltage measuring units 51a to 51c and 52a to 52c, and whether or not there are batteries 21a to 21c and 22a to 22c that have reached the discharge end voltage. (Step S25). If there are no batteries 21a to 21c and 22a to 22c that have reached the discharge end voltage (N in step S26), the control unit 8 returns to step S21.

一方、放電終止電圧に達した電池２１ａ〜２１ｃ、２２ａ〜２２ｃがあれば（ステップＳ２６でＹ）、制御部８は、全電池２１ａ〜２１ｃ、２２ａ〜２２ｃが放電終止電圧に達したか否かを判定する（ステップＳ２７）。全電池２１ａ〜２１ｃ、２２ａ〜２２ｃが放電終止電圧に達してなければ（ステップＳ２７でＮ）、制御部８は、放電終止電圧に達したと判定された電池２１ａ〜２１ｃ、２２ａ〜２２ｃに対応する第１スイッチＳＷ１１ａ〜ＳＷ１１ｃ、ＳＷ２１ａ〜ＳＷ２１ｃをオフ、第２スイッチＳＷ１２ａ〜ＳＷ１２ｃ、ＳＷ２２ａ〜ＳＷ２２ｃをオンして、放電終止電圧に達した電池２１ａ〜２１ｃ、２２ａ〜２２ｃをバイパスした後（ステップＳ２７）、ステップＳ２１に戻る。 On the other hand, if there are batteries 21a to 21c and 22a to 22c that have reached the discharge end voltage (Y in step S26), the control unit 8 determines whether or not all the batteries 21a to 21c and 22a to 22c have reached the discharge end voltage. Is determined (step S27). If all the batteries 21a to 21c and 22a to 22c have not reached the discharge end voltage (N in step S27), the control unit 8 corresponds to the batteries 21a to 21c and 22a to 22c determined to have reached the discharge end voltage. After turning off the first switches SW11a to SW11c and SW21a to SW21c and turning on the second switches SW12a to SW12c and SW22a to SW22c to bypass the batteries 21a to 21c and 22a to 22c that have reached the discharge end voltage (step S27). ), Return to step S21.

なお、ステップＳ２１〜Ｓ２５は、毎回、実行されなくてもよい。例えば、制御部８は、組電池２１、２２の総電圧が前回のステップＳ３の実行時に比べて一定値以上変化した場合のみ、ステップＳ２１〜Ｓ２５を実行するようにしてもよい。これにより、電池２１ａ〜２１ｃ、２２ａ〜２２ｃのバイパス状態の変更が頻繁に行われることを避けることができる。 It should be noted that steps S21 to S25 do not have to be executed every time. For example, the control unit 8 may execute steps S21 to S25 only when the total voltage of the assembled batteries 21 and 22 changes by a certain value or more as compared with the execution of the previous step S3. As a result, it is possible to avoid frequent changes in the bypass state of the batteries 21a to 21c and 22a to 22c.

また、全ての電池が放電終止電圧に達していれば（ステップＳ２７でＹ）、制御部８は、充電処理と同様にステップＳ１１〜Ｓ１３を実行して、放電処理を終了する。 If all the batteries have reached the discharge end voltage (Y in step S27), the control unit 8 executes steps S11 to S13 in the same manner as the charging process to end the discharging process.

なお、本発明は、上述した実施形態に限定されるものではなく、適宜、変形、改良、等が可能である。その他、上述した実施形態における各構成要素の材質、形状、寸法、数、配置箇所、等は本発明を達成できるものであれば任意であり、限定されない。 The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like. In addition, the material, shape, size, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

上述した実施形態によれば、充電終止電圧又は放電終止電圧に達していない電池２１ａ〜２１ｃ、２２ａ〜２２ｃのうち非接続状態に制御するものの組み合わせを設定する際、全ての組み合わせを設定していたが、これに限ったものではない。組電池２１、２２の総電圧を同等とできるようであれば、どのような組み合わせを設定してもよい。 According to the above-described embodiment, when setting the combination of the batteries 21a to 21c and 22a to 22c that have not reached the charge end voltage or the discharge end voltage and are controlled to be in the non-connected state, all the combinations are set. However, it is not limited to this. Any combination may be set as long as the total voltages of the assembled batteries 21 and 22 can be made equivalent.

また、上述した実施形態によれば、切替部４１ａ〜４１ｃ、４２ａ〜４２ｃとしては、２つの第１スイッチＳＷ１１ａ〜ＳＷ１１ｃ、ＳＷ２１ａ〜ＳＷ２１ｃ、第２スイッチＳＷ１２ａ〜ＳＷ１２ｃ、ＳＷ２２ａ〜ＳＷ２２ｃとから構成されていたが、これに限ったものではない。切替部４１ａ〜４１ｃ、４２ａ〜４２ｃとしては、電池２１ａ〜２１ｃ、２２ａ〜２２ｃと、電池２１ａ〜２１ｃ、２２ａ〜２２ｃに並列接続されたバイパス回路と、の何れかを選択する切替スイッチから構成されていてもよい。 Further, according to the above-described embodiment, the switching units 41a to 41c and 42a to 42c are composed of two first switches SW11a to SW11c, SW21a to SW21c, and second switches SW12a to SW12c and SW22a to SW22c. However, it is not limited to this. The switching units 41a to 41c and 42a to 42c are composed of a changeover switch for selecting one of the batteries 21a to 21c and 22a to 22c and the bypass circuit connected in parallel to the batteries 21a to 21c and 22a to 22c. You may be.

また、上述した実施形態によれば、制御部８は、放電時において、組電池２１、２２の総電圧が同等となる組み合わせのうち組電池２１、２２の総電圧が最大となる組み合わせの電池２１ａ〜２１ｃ、２２ａ〜２２ｃを非接続状態に制御して、放電電力を最大としていたが、これに限ったものではない。制御部８は、放電時において同等となる組み合わせ毎に、放電電力を求めて、求めた放電電力が最大となる組み合わせに従って切替部４１ａ〜４１ｃ、４２ａ〜４２ｃを制御するようにしてもよい。なお、放電電力は、電圧測定部５１ａ〜５１ｃにより測定された組電池２１、２２の電圧とその状態において、上記組電池２１、２２に予め容易された最大出力電流マップに基づき算出してもよいし、他の方法により決定してもよい。 Further, according to the above-described embodiment, the control unit 8 has the battery 21a of the combination in which the total voltage of the assembled batteries 21 and 22 becomes the maximum among the combinations in which the total voltage of the assembled batteries 21 and 22 becomes the same at the time of discharging. ~ 21c and 22a to 22c were controlled in a non-connected state to maximize the discharge power, but the present invention is not limited to this. The control unit 8 may obtain the discharge power for each combination that becomes equivalent at the time of discharge, and control the switching units 41a to 41c and 42a to 42c according to the combination that maximizes the obtained discharge power. The discharge power may be calculated based on the voltage of the assembled batteries 21 and 22 measured by the voltage measuring units 51a to 51c and the maximum output current map easily provided to the assembled batteries 21 and 22 in that state. However, it may be determined by another method.

また、上述した実施形態によれば、充電電力は、組電池２１、２２の総電圧と、許容最大充電電流との積として求めていたが、これに限ったものではない。充電電力は、電圧測定部５１ａ〜５１ｃにより測定された組電池２１、２２の電圧とその状態において、上記組電池２１、２２に予め用意された最大入力電流マップに基づき算出してもよいし、他の方法により決定してもよい。 Further, according to the above-described embodiment, the charging power is determined as the product of the total voltage of the assembled batteries 21 and 22 and the maximum allowable charging current, but the charging power is not limited to this. The charging power may be calculated based on the voltage of the assembled batteries 21 and 22 measured by the voltage measuring units 51a to 51c and the maximum input current map prepared in advance for the assembled batteries 21 and 22 in that state. It may be determined by another method.

ここで、上述した本発明に係る電池制御ユニットおよび電池システムの実施形態の特徴をそれぞれ以下［１］〜［５］に簡潔に纏めて列記する。
［１］
互いに並列接続された複数の組電池（２１、２２）各々が有する、互いに直列接続された複数の電池（２１ａ〜２１ｃ、２２ａ〜２２ｃ）、毎に設けられ、対応する前記電池（２１ａ〜２１ｃ、２２ａ〜２２ｃ）が他の前記電池（２１ａ〜２１ｃ、２２ａ〜２２ｃ）と直列接続された接続状態と、対応する前記電池（２１ａ〜２１ｃ、２２ａ〜２２ｃ）が他の前記電池（２１ａ〜２１ｃ、２２ａ〜２２ｃ）と直列接続から切り離された非接続状態と、に切り替える切替部（４１ａ〜４１ｃ、４２ａ〜４２ｃ）と、
充電又は放電時に終止電圧に達したと判定した前記電池（２１ａ〜２１ｃ、２２ａ〜２２ｃ）に対応する前記切替部（４１ａ〜４１ｃ、４２ａ〜４２ｃ）を前記非接続状態に制御する第１制御部（８）と、
複数の前記組電池（２１、２２）の総電圧が同等になるように、前記終止電圧に達していない前記電池（２１ａ〜２１ｃ、２２ａ〜２２ｃ）の前記切替部（４１ａ〜４１ｃ、４２ａ〜４２ｃ）を前記非接続状態に制御する第２制御部（８）と、を備えた、
電池制御ユニット（３）。
［２］
［１］に記載の電池制御ユニット（３）において、
前記第２制御部（８）は、前記終止電圧に達していない前記電池（２１ａ〜２１ｃ、２２ａ〜２２ｃ）のうち、前記非接続状態に制御するものの組み合わせを設定し、設定した組合せ毎に複数の前記組電池（２１、２２）の前記総電圧を求め、複数の前記組電池（２１、２２）の前記総電圧が同等となる組み合わせに従って前記切替部（４１ａ〜４１ｃ、４２ａ〜４２ｃ）を制御する、
電池制御ユニット（３）。
［３］
［２］に記載の電池制御ユニット（３）において、
前記第２制御部（８）は、充電時において前記同等となる組み合わせ毎に、充電電力を求めて、求めた充電電力が最大となる組み合わせに従って前記切替部（４１ａ〜４１ｃ、４２ａ〜４２ｃ）を制御する、
電池制御ユニット（３）。
［４］
請求項２又は３に記載の電池制御ユニット（３）において、
前記第２制御部（８）は、放電時において前記同等となる組み合わせのうち前記組電池（２１、２２）の放電電力が最大となる組み合わせに従って前記切替部（４１ａ〜４１ｃ、４２ａ〜４２ｃ）を制御する、
電池制御ユニット（３）。
［５］
直列接続された複数の電池（２１ａ〜２１ｃ、２２ａ〜２２ｃ）を有し、互いに並列接続された複数の組電池（２１、２２）と、
［１］〜［４］何れか１項に記載の電池制御ユニット（３）と、を備えた、
電池システム（１）。 Here, the features of the battery control unit and the embodiment of the battery system according to the present invention described above are briefly summarized and listed below in [1] to [5], respectively.
[1]
A plurality of batteries (21a to 21c, 22a to 22c) connected in series to each other, each of the plurality of assembled batteries (21, 22) connected in parallel to each other, and the corresponding batteries (21a to 21c, 22a-22c) is connected in series with the other batteries (21a-21c, 22a-22c), and the corresponding batteries (21a-21c, 22a-22c) are other batteries (21a-21c, 22a-22c). 22a to 22c) and the non-connected state disconnected from the series connection, and the switching unit (41a to 41c, 42a to 42c) that switches to.
A first control unit that controls the switching units (41a to 41c, 42a to 42c) corresponding to the batteries (21a to 21c, 22a to 22c) determined to have reached the final voltage during charging or discharging to the disconnected state. (8) and
The switching portions (41a to 41c, 42a to 42c) of the batteries (21a to 21c, 22a to 22c) that have not reached the final voltage so that the total voltages of the plurality of assembled batteries (21, 22) are equal. ) Is provided with a second control unit (8) for controlling the disconnected state.
Battery control unit (3).
[2]
In the battery control unit (3) according to [1],
The second control unit (8) sets a combination of the batteries (21a to 21c, 22a to 22c) that have not reached the final voltage and controls the non-connected state, and a plurality of combinations are set for each set combination. The total voltage of the assembled batteries (21, 22) is obtained, and the switching units (41a to 41c, 42a to 42c) are controlled according to a combination in which the total voltages of the plurality of assembled batteries (21, 22) are equivalent. To do,
Battery control unit (3).
[3]
In the battery control unit (3) described in [2],
The second control unit (8) obtains charging power for each of the equivalent combinations during charging, and switches the switching units (41a to 41c, 42a to 42c) according to the combination in which the obtained charging power is maximized. Control,
Battery control unit (3).
[4]
In the battery control unit (3) according to claim 2 or 3.
The second control unit (8) switches the switching units (41a to 41c, 42a to 42c) according to the combination in which the discharge power of the assembled batteries (21, 22) is maximized among the equivalent combinations at the time of discharging. Control,
Battery control unit (3).
[5]
A plurality of assembled batteries (21, 22) having a plurality of batteries (21a to 21c, 22a to 22c) connected in series and connected in parallel with each other.
The battery control unit (3) according to any one of [1] to [4] is provided.
Battery system (1).

１ 電池システム
３ 電池制御ユニット
８ 制御部（第１制御部、第２制御部）
２１、２２ 組電池
２１ａ〜２１ｃ 電池
２２ａ〜２２ｃ 電池
４１ａ〜４１ｃ 切替部
４２ａ〜４２ｃ 切替部 1 Battery system 3 Battery control unit 8 Control unit (1st control unit, 2nd control unit)
21 and 22 sets of batteries 21a to 21c Battery 22a to 22c Battery 41a to 41c Switching unit 42a to 42c Switching unit

Claims (5)

互いに並列接続された複数の組電池各々が有する、互いに直列接続された複数の電池、毎に設けられ、対応する前記電池が他の前記電池と直列接続された接続状態と、対応する前記電池が他の前記電池と直列接続から切り離された非接続状態と、に切り替える切替部と、
充電又は放電時に終止電圧に達したと判定した前記電池に対応する前記切替部を前記非接続状態に制御する第１制御部と、
複数の前記組電池の総電圧が同等になるように、前記終止電圧に達していない前記電池の前記切替部を前記非接続状態に制御する第２制御部と、を備えた、
電池制御ユニット。 A plurality of batteries connected in series to each other, each of a plurality of assembled batteries connected in parallel to each other, a connected state in which the corresponding battery is connected in series with the other batteries, and the corresponding battery A switching unit that switches between the non-connected state disconnected from the series connection with the other batteries, and
A first control unit that controls the switching unit corresponding to the battery, which is determined to have reached the final voltage during charging or discharging, in the non-connected state.
A second control unit that controls the switching unit of the battery that has not reached the end voltage to the non-connected state so that the total voltage of the plurality of assembled batteries becomes equal is provided.
Battery control unit. 請求項１に記載の電池制御ユニットにおいて、
前記第２制御部は、前記終止電圧に達していない前記電池のうち、前記非接続状態に制御するものの組み合わせを設定し、設定した組合せ毎に複数の前記組電池の前記総電圧を求め、複数の前記組電池の前記総電圧が同等となる組み合わせに従って前記切替部を制御する、
電池制御ユニット。 In the battery control unit according to claim 1,
The second control unit sets a combination of the batteries that have not reached the final voltage and controls the non-connected state, obtains the total voltage of the plurality of assembled batteries for each set combination, and obtains a plurality of such batteries. The switching unit is controlled according to a combination in which the total voltages of the assembled batteries are equal to each other.
Battery control unit. 請求項２に記載の電池制御ユニットにおいて、
前記第２制御部は、充電時において前記同等となる組み合わせ毎に、充電電力を求めて、求めた充電電力が最大となる組み合わせに従って前記切替部を制御する、
電池制御ユニット。 In the battery control unit according to claim 2,
The second control unit obtains charging power for each combination that becomes equivalent at the time of charging, and controls the switching unit according to the combination that maximizes the obtained charging power.
Battery control unit. 請求項２又は３に記載の電池制御ユニットにおいて、
前記第２制御部は、放電時において前記同等となる組み合わせのうち前記組電池の放電電力が最大となる組み合わせに従って前記切替部を制御する、
電池制御ユニット。 In the battery control unit according to claim 2 or 3.
The second control unit controls the switching unit according to the combination in which the discharge power of the assembled battery is maximized among the equivalent combinations at the time of discharging.
Battery control unit. 直列接続された複数の電池を有し、互いに並列接続された複数の組電池と、
請求項１〜４の何れか１項に記載の電池制御ユニットと、を備えた、
電池システム。 With multiple assembled batteries having multiple batteries connected in series and connected in parallel with each other,
The battery control unit according to any one of claims 1 to 4 is provided.
Battery system.
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