JP2009201232A - Storage device - Google Patents

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JP2009201232A
JP2009201232A JP2008039542A JP2008039542A JP2009201232A JP 2009201232 A JP2009201232 A JP 2009201232A JP 2008039542 A JP2008039542 A JP 2008039542A JP 2008039542 A JP2008039542 A JP 2008039542A JP 2009201232 A JP2009201232 A JP 2009201232A
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secondary batteries
temperature
current
storage device
secondary battery
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Takashi Domoto
貴史 堂元
Ryuichi Morikawa
竜一 森川
Asami Mizutani
麻美 水谷
Yukio Kadota
行生 門田
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Toshiba Corp
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Toshiba 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
    • 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

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage device, capable of equalizing charging and discharging currents passing through respective secondary cells connected in parallel. <P>SOLUTION: The storage device, configured by parallel connection with a plurality of secondary cells 11a to 11n, includes: current detectors 15a to 15n and intended for detecting each current passing through the secondary cells 11a to 11n thereof; temperature detectors 16a to 16n for detecting the temperatures of the secondary cells 11a to 11n; and temperature regulators 19a to 19n for individually adjusting the temperatures of the secondary cells 11a to 11n, based on the current values detected by the current detectors 15a to 15n and the temperature values detected by the temperature detectors 16a to 16n. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、複数の二次電池を並列に接続して構成される蓄電装置に関する。   The present invention relates to a power storage device configured by connecting a plurality of secondary batteries in parallel.

充放電システムを大容量化するには複数の二次電池を並列に接続することが必要になる。通常、同じ種類の二次電池を並列に接続すると、各二次電池に流れる充放電電流は均一になる。直流電力の充放電が可能な複数台の蓄電ユニットで構成された蓄電装置として、比較的簡単な回路構成で、且つ電力消費の少ない電圧均等化機能を有するものがある（例えば、特許文献１参照）。
特開２００７−５３８３８号公報 To increase the capacity of the charge / discharge system, it is necessary to connect a plurality of secondary batteries in parallel. Normally, when secondary batteries of the same type are connected in parallel, the charge / discharge current flowing through each secondary battery becomes uniform. As a power storage device including a plurality of power storage units capable of charging / discharging DC power, there is a power storage device having a relatively simple circuit configuration and a voltage equalizing function with low power consumption (see, for example, Patent Document 1). ).
JP 2007-53838 A

しかし、二次電池を並列に接続する場合、各二次電池の温度が異なると、二次電池の内部抵抗の温度依存性や二次電池内部での化学反応速度のばらつきから、各二次電池に流れる充放電電流が均等にならないことがある。   However, when connecting secondary batteries in parallel, if the temperature of each secondary battery is different, each secondary battery will be affected by the temperature dependence of the internal resistance of the secondary battery and the variation in the chemical reaction rate inside the secondary battery. The charge / discharge current flowing through the battery may not be uniform.

このため、他の二次電池よりも電流が大きく流れた二次電池は発熱が大きくなり、その二次電池が温度許容範囲を超えてしまう恐れがある。それだけではなく、他の二次電池よりも大きい電流が流れると過電流になることも考えられる。   For this reason, a secondary battery in which a current flows larger than other secondary batteries generates a large amount of heat, and the secondary battery may exceed the allowable temperature range. Not only that, it is also possible that an overcurrent occurs when a larger current flows than other secondary batteries.

本発明の目的は、並列に接続された各々の二次電池に流れる充放電電流を均等にできる蓄電装置を提供することである。   The objective of this invention is providing the electrical storage apparatus which can equalize the charging / discharging electric current which flows into each secondary battery connected in parallel.

本発明の蓄電装置は、複数の二次電池を並列接続して構成される蓄電装置において、前記二次電池に流れるそれぞれの電流を検知する電流検出器と、前記二次電池の温度を検知する温度検出器と、前記電流検出器によって検出された電流値及び前記温度検出器の温度値に基づいて前記二次電池の温度を個別に調整する温度調整部とを備えたことを特徴とする。   The power storage device of the present invention is a power storage device configured by connecting a plurality of secondary batteries in parallel, a current detector that detects each current flowing through the secondary battery, and a temperature of the secondary battery. A temperature detector, and a temperature adjustment unit that individually adjusts the temperature of the secondary battery based on the current value detected by the current detector and the temperature value of the temperature detector are provided.

本発明によれば、並列に接続された各々の二次電池に流れる充放電電流を均等にできる。   According to the present invention, charge / discharge currents flowing through the secondary batteries connected in parallel can be made uniform.

図１は本発明の実施の形態に係わる蓄電装置の構成図である。各々の二次電池１１ａ〜１１ｎは開閉器１２ａ〜１２ｎを介して並列に電源１３及び負荷１４に接続されている。各々の二次電池１１ａ〜１１ｎに充電するときは電源１３から各々の二次電池１１ａ〜１１ｎに電力が供給され、各々の二次電池１１ａ〜１１ｎから放電するときは各々の二次電池１１ａ〜１１ｎに負荷１４に電力が供給される。図１では、各々の二次電池１１ａ〜１１ｎは、単一の二次電池である場合を示しているが、複数の二次電池を直列に接続した組二次電池でもあってもよい。   FIG. 1 is a configuration diagram of a power storage device according to an embodiment of the present invention. Each of the secondary batteries 11a to 11n is connected to the power source 13 and the load 14 in parallel via the switches 12a to 12n. When the secondary batteries 11a to 11n are charged, power is supplied from the power supply 13 to the secondary batteries 11a to 11n. When the secondary batteries 11a to 11n are discharged, the secondary batteries 11a to 11n are charged. Power is supplied to the load 14 at 11n. In FIG. 1, each of the secondary batteries 11a to 11n is shown as a single secondary battery, but may be a set secondary battery in which a plurality of secondary batteries are connected in series.

各々の二次電池１１ａ〜１１ｎには電流検出器１５ａ〜１５ｎ及び温度検出部１６ａ〜１６ｎが取り付けられており、電流検出器１５ａ〜１５ｎで検出された電流値は電流バランス演算・判定部１７に入力され、温度検出部１６ａ〜１６ｎで検出された温度は検出温度値演算処理部１８に入力される。また、各々の二次電池１１ａ〜１１ｎには、各々の二次電池１１ａ〜１１ｎの温度を調整する温度調整部１９ａ〜１９ｎが設けられている。   Current detectors 15a to 15n and temperature detectors 16a to 16n are attached to the respective secondary batteries 11a to 11n, and the current values detected by the current detectors 15a to 15n are supplied to the current balance calculation / determination unit 17. The temperatures detected by the temperature detection units 16a to 16n are input to the detected temperature value calculation processing unit 18. Moreover, the temperature adjustment parts 19a-19n which adjust the temperature of each secondary battery 11a-11n are provided in each secondary battery 11a-11n.

電流バランス演算・判定部１７は二次電池１１ａ〜１１ｎに流れる電流値に基づいて二次電池１１ａ〜１１ｎの温度調整が必要か否かを判断する。例えば、二次電池１１ａ〜１１ｎに流れる電流の最大値と最小値との差から温度調整が必要か否かを判断したり、二次電池１１ａ〜１１ｎを流れる電流の平均値と二次電池１１ａ〜１１ｎに流れる電流値との差から二次電池１１ａ〜１１ｎの温度調整が必要か否かを判断したりする。そして、電流バランス演算・判定部１７は、二次電池１１ａ〜１１ｎの温度調整が必要と判断したときは、温度調整部１９ａ〜１９ｎの機能を有効にし、不要と判断されたら、温度調整部１９ａ〜１９ｎの機能を無効にする。   The current balance calculation / determination unit 17 determines whether or not temperature adjustment of the secondary batteries 11a to 11n is necessary based on the value of the current flowing through the secondary batteries 11a to 11n. For example, it is determined whether temperature adjustment is necessary from the difference between the maximum value and the minimum value of the current flowing through the secondary batteries 11a to 11n, or the average value of the current flowing through the secondary batteries 11a to 11n and the secondary battery 11a. It is determined whether or not the temperature adjustment of the secondary batteries 11a to 11n is necessary from the difference from the current value flowing to .about.11n. When the current balance calculation / determination unit 17 determines that the temperature adjustment of the secondary batteries 11a to 11n is necessary, the current balance calculation / determination unit 17 enables the functions of the temperature adjustment units 19a to 19n. Disable the function of ~ 19n.

次に、検出温度値演算処理部１８は二次電池１１ａ〜１１ｎの温度設定値を設定するものである。例えば、二次電池１１ａ〜１１ｎの温度の最大値と最小値との差から温度設定値をその中間値にしたり、二次電池１１ａ〜１１ｎの温度の平均値を温度設定値にしたりする。   Next, the detected temperature value calculation processing part 18 sets the temperature setting value of the secondary batteries 11a-11n. For example, the temperature set value is set to the intermediate value from the difference between the maximum value and the minimum value of the temperatures of the secondary batteries 11a to 11n, or the average value of the temperatures of the secondary batteries 11a to 11n is set to the temperature set value.

温度調整部１９ａ〜１９ｎは検出温度値演算処理部１８で設定された温度設定値を基に二次電池１１ａ〜１１ｎの特性を踏まえて、加熱・冷却して二次電池１１ａ〜１１ｎの温度を調整する。すなわち、温度調整部１９ａ〜１９ｎは、複数の二次電池１１ａ〜１１ｎのうち、一部の二次電池１１よりも温度が高い二次電池１１を冷却して複数の二次電池１１ａ〜１１ｎに流れる電流を均等にする冷却機能と、複数の二次電池１１ａ〜１１ｎのうち一部の二次電池１１よりも温度が低い二次電池１１を加熱して複数の二次電池１１ａ〜１１ｎに流れる電流を均等にする加熱機能とを有している。なお、冷却機能及び加熱機能のうち、いずれか一方のみを有し、複数の二次電池１１ａ〜１１ｎに流れる電流を均等に調整するようにしてもよい。   The temperature adjusters 19a to 19n are heated and cooled based on the characteristics of the secondary batteries 11a to 11n on the basis of the temperature set values set by the detected temperature value calculation processor 18, and the temperatures of the secondary batteries 11a to 11n are set. adjust. That is, the temperature adjustment units 19a to 19n cool the secondary batteries 11 having a higher temperature than some of the secondary batteries 11 among the plurality of secondary batteries 11a to 11n to form the plurality of secondary batteries 11a to 11n. The cooling function that equalizes the flowing current and the secondary batteries 11 having a temperature lower than that of some of the secondary batteries 11a to 11n are heated to flow to the plurality of secondary batteries 11a to 11n. And a heating function for equalizing the current. Note that only one of the cooling function and the heating function may be provided, and the current flowing through the plurality of secondary batteries 11a to 11n may be adjusted equally.

また、二次電池の温度調整はすべてを同一にする必要はなく二次電池１１ａ〜１１ｎの状態（劣化具合など）から、各二次電池１１ａ〜１１ｎの設定温度を決定する。各二次電池１１ａ〜１１ｎの温度調整は、電流バランス演算・判定部１７で温度調整が不要と判断されるまで続け、これにより、各二次電池１１ａ〜１１ｎに流れる電流を均等化する。   Further, the temperature adjustment of the secondary batteries does not need to be all the same, and the set temperature of each of the secondary batteries 11a to 11n is determined from the state of the secondary batteries 11a to 11n (such as deterioration). The temperature adjustment of each of the secondary batteries 11a to 11n is continued until the current balance calculation / determination unit 17 determines that the temperature adjustment is unnecessary, thereby equalizing the current flowing through each of the secondary batteries 11a to 11n.

このように、電流バランス演算・判定部１７は温度調整の必要性の有無を判定し、もし、各々の二次電池１１ａ〜１１ｎの温度を調整する必要があるときは、検出温度値演算処理部１８で二次電池１１ａ〜１１ｎの温度設定値を決定する。そして、温度調整部１９ａ〜１９ｎは、現在の二次電池１１ａ〜１１ｎの温度値と二次電池１１ａ〜１１ｎの温度設定値とを比較し二次電池１１ａ〜１１ｎの温度調整を行う。   As described above, the current balance calculation / determination unit 17 determines whether or not temperature adjustment is necessary, and if it is necessary to adjust the temperature of each of the secondary batteries 11a to 11n, the detected temperature value calculation processing unit. 18 determines the temperature setting values of the secondary batteries 11a to 11n. And the temperature adjustment parts 19a-19n compare the temperature value of the present secondary batteries 11a-11n, and the temperature setting value of the secondary batteries 11a-11n, and adjust the temperature of the secondary batteries 11a-11n.

以上の説明は、並列接続された二次電池１１ａ〜１１ｎが運転中に各々の二次電池１１ａ〜１１ｎの温度調整を行う場合について説明したが、二次電池１１ａ〜１１ｎを並列に接続にする前に、二次電池１１ａ〜１１ｎの温度を等しくするようにしてもよい。このようにすることで、二次電池１１ａ〜１１ｎ内部の特性（内部抵抗や二次電池内の化学反応の速度）の差が小さくなる。このため、二次電池１１ａ〜１１ｎの温度を温度調整部１９ａ〜１９ｎで等しくしてから、二次電池１１ａ〜１１ｎを並列に接続して充放電の運転を行っても、二次電池１１ａ〜１１ｎに流れる電流が等しくなりバランスする。   Although the above description demonstrated the case where the secondary batteries 11a-11n connected in parallel performed temperature adjustment of each secondary battery 11a-11n during a driving | running, the secondary batteries 11a-11n are connected in parallel. Before, you may make it make the temperature of the secondary batteries 11a-11n equal. By doing in this way, the difference of the characteristic (internal resistance and the speed | rate of the chemical reaction in a secondary battery) inside the secondary batteries 11a-11n becomes small. For this reason, even if the temperature of the secondary batteries 11a to 11n is equalized by the temperature adjusting units 19a to 19n and then the secondary batteries 11a to 11n are connected in parallel to perform the charge / discharge operation, the secondary batteries 11a to 11n. The currents flowing through 11n are equal and balanced.

また、二次電池１１ａ〜１１ｎのうち充放電に使用されていない単数または複数の二次電池を、二次電池１１ａ〜１１ｎのうち充放電に使用されている単数または複数の二次電池に追加で並列に接続する場合には、二次電池１１ａ〜１１ｎのうち充放電に使用されていない単数または複数の二次電池の温度を、二次電池１１ａ〜１１ｎのうち充放電に使用されている単数または複数の二次電池の温度に合わせる。あるいは、二次電池１１ａ〜１１ｎのうち充放電に使用されている単数または複数の二次電池の温度を、二次電池１１ａ〜１１ｎのうち充放電に使用されていない単数または複数の二次電池の温度に合わせる。このようにすることで、二次電池１１ａ〜１１ｎの温度が等しくなるため、充電状態が等しければ、二次電池１１ａ〜１１ｎ間の横流電流も流れず二次電池１１ａ〜１１ｎにはほぼ均等に充放電電流が流れる。   Further, one or more secondary batteries that are not used for charging / discharging among the secondary batteries 11a to 11n are added to one or more secondary batteries that are used for charging / discharging among the secondary batteries 11a to 11n. When connecting in parallel, the temperature of one or more secondary batteries not used for charging / discharging among the secondary batteries 11a-11n is used for charging / discharging among the secondary batteries 11a-11n. Match the temperature of one or more secondary batteries. Alternatively, the temperature of one or more secondary batteries used for charging / discharging among the secondary batteries 11a to 11n is changed to the temperature of one or more secondary batteries not used for charging / discharging among the secondary batteries 11a to 11n. Adjust to the temperature of. By doing in this way, since the temperature of secondary battery 11a-11n becomes equal, if a charge state is equal, the cross current between secondary batteries 11a-11n will not flow, but it will be almost equal to secondary battery 11a-11n. Charge / discharge current flows.

本発明の実施の形態によれば、電流検出器１５ａ〜１５ｎによって検出された電流値及び温度検出器１６ａ〜１６ｎの温度値に基づいて二次電池１１ａ〜１１ｎの温度を個別に調整するので、二次電池１１ａ〜１１ｎにほぼ均等に充放電電流を流すことができる。   According to the embodiment of the present invention, since the temperatures of the secondary batteries 11a to 11n are individually adjusted based on the current values detected by the current detectors 15a to 15n and the temperature values of the temperature detectors 16a to 16n, The charge / discharge current can be made to flow almost uniformly through the secondary batteries 11a to 11n.

本発明の実施の形態に係わる蓄電装置の構成図。The block diagram of the electrical storage apparatus concerning embodiment of this invention.

符号の説明Explanation of symbols

１１…二次電池、１２…開閉器、１３…電源、１４…負荷、１５…電流検出器、１６…温度検出器、１７…電流バランス演算・判定部、１８…検出温度値演算処理部、１９…温度調整部 DESCRIPTION OF SYMBOLS 11 ... Secondary battery, 12 ... Switch, 13 ... Power supply, 14 ... Load, 15 ... Current detector, 16 ... Temperature detector, 17 ... Current balance calculation / determination part, 18 ... Detection temperature value calculation processing part, 19 ... Temperature adjuster

Claims (5)

複数の二次電池を並列接続して構成される蓄電装置において、前記二次電池に流れるそれぞれの電流を検知する電流検出器と、前記二次電池の温度を検知する温度検出器と、前記電流検出器によって検出された電流値及び前記温度検出器の温度値に基づいて前記二次電池の温度を個別に調整する温度調整部とを備えたことを特徴とする蓄電装置。 In a power storage device configured by connecting a plurality of secondary batteries in parallel, a current detector that detects each current flowing through the secondary battery, a temperature detector that detects a temperature of the secondary battery, and the current A power storage device comprising: a temperature adjustment unit that individually adjusts the temperature of the secondary battery based on a current value detected by a detector and a temperature value of the temperature detector. 前記温度調整部は、複数の二次電池のうち一部の二次電池よりも温度が低い二次電池を加熱して複数の二次電池に流れる電流を均等に調整する機能を持つことことを特徴とする請求項１に記載の蓄電装置。 The temperature adjusting unit has a function of heating a secondary battery having a temperature lower than that of some of the secondary batteries to uniformly adjust the current flowing through the secondary batteries. The power storage device according to claim 1. 前記温度調整部は、複数の二次電池のうち一部の二次電池よりも温度が高い二次電池を冷却して複数の二次電池に流れる電流を均等に調整する機能を持つことを特徴とする請求項１に記載の蓄電装置。 The temperature adjusting unit has a function of uniformly adjusting currents flowing through the plurality of secondary batteries by cooling secondary batteries having a higher temperature than some of the secondary batteries. The power storage device according to claim 1. 前記温度調整部は、複数の二次電池のうち一部の二次電池よりも温度が高い二次電池を冷却して複数の二次電池に流れる電流を均等にする機能と、複数の二次電池のうち一部の二次電池よりも温度が低い二次電池を加熱して複数の二次電池に流れる電流を均等にする機能とを併せ持つことを特徴とする請求項１記載の蓄電装置。 The temperature adjusting unit has a function of cooling a secondary battery having a temperature higher than that of some of the secondary batteries to equalize a current flowing through the secondary batteries, and a plurality of secondary batteries. 2. The power storage device according to claim 1, further comprising a function of heating a secondary battery having a temperature lower than that of some of the secondary batteries to equalize a current flowing through the plurality of secondary batteries. 前記温度調整部は、複数の二次電池を並列に接続する前に、予めすべての二次電池の温度を均一にすることを特徴とする請求項１に記載の蓄電装置。 The power storage device according to claim 1, wherein the temperature adjustment unit equalizes the temperatures of all the secondary batteries in advance before connecting the plurality of secondary batteries in parallel.
JP2008039542A 2008-02-21 2008-02-21 Storage device Pending JP2009201232A (en)

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