JP2018125930A - Battery pack voltage measuring device and battery control device - Google Patents

Battery pack voltage measuring device and battery control device Download PDF

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JP2018125930A
JP2018125930A JP2017014974A JP2017014974A JP2018125930A JP 2018125930 A JP2018125930 A JP 2018125930A JP 2017014974 A JP2017014974 A JP 2017014974A JP 2017014974 A JP2017014974 A JP 2017014974A JP 2018125930 A JP2018125930 A JP 2018125930A
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assembled battery
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circuit
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JP6602800B2 (en
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雄二 吉岡
Yuji Yoshioka
雄二 吉岡
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Hitachi Astemo Ltd
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Hitachi Automotive Systems Ltd
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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

PROBLEM TO BE SOLVED: To provide a battery control device capable of detecting a failure part and a failure state of a battery pack voltage measuring circuit.SOLUTION: The battery pack voltage measuring device (140) measures voltages of battery packs (112a, 112b) in each of which a plurality of secondary batteries (111) is connected in series. The battery pack voltage measuring device (140) includes: a plurality of series resistors (141, 1400) connected in series to a power supply line (113); and a ground-side voltage dividing resistor (1410) connected to an end of the series resistors. Among the series resistors (141), one resistor is a two-series two-parallel circuits (1401, 1402, 1403, 1404). Ground-side voltage dividing resistors (1411, 1412) are circuits in which resistances are two in parallel.SELECTED DRAWING: Figure 2

Description

本発明は電池制御装置の組電池電圧測定装置及びそれを用いた電池制御装置に関する。   The present invention relates to an assembled battery voltage measuring device for a battery control device and a battery control device using the same.

近年、バッテリシステムはますます安全性向上が求められている。そこでバッテリシステムを監視する為に、リチウムイオン二次電池の総電圧を検出する総電圧検出回路が設けられている。この総電圧検出回路から出力される電圧検出信号は、その後マイクロプロセッサに入力されて、リチウムイオン二次電池の制御に使用される。故障はバッテリシステムにおいて、大きな影響があり、迅速に検出することが求められる。   In recent years, battery systems are increasingly required to improve safety. In order to monitor the battery system, a total voltage detection circuit for detecting the total voltage of the lithium ion secondary battery is provided. The voltage detection signal output from the total voltage detection circuit is then input to the microprocessor and used for controlling the lithium ion secondary battery. Failures have a significant impact on battery systems and require rapid detection.

そのため、総電圧検出回路の故障はバッテリシステムにおいて、大きな影響があり、迅速に検出することが求められる。たとえば特許文献１に記載の電源装置では、組電池電圧を同一抵抗値複数個で構成された直列抵抗と、グランドに接続した抵抗により、組電池制御部の入力電圧範囲に収まるように分圧し、単電池電圧情報との比較で、組電池電圧測定回路の故障を検出している。   Therefore, the failure of the total voltage detection circuit has a great influence on the battery system and is required to be detected quickly. For example, in the power supply device described in Patent Document 1, the assembled battery voltage is divided so as to be within the input voltage range of the assembled battery control unit by a series resistor composed of a plurality of identical resistance values and a resistor connected to the ground. A failure of the assembled battery voltage measurement circuit is detected by comparison with the cell voltage information.

ＷＯ２０１１／０４０１２８WO2011 / 040128

しかし、特許文献１に記載の発明では、総電圧検出回路において故障が発生した場合、故障箇所、故障状態までは判定できない。そのため、本発明の目的は、組電池電圧測定回路の故障箇所、故障状態を検出することを可能にする電池制御装置を提供することを課題とする。   However, in the invention described in Patent Document 1, when a failure occurs in the total voltage detection circuit, it is not possible to determine the failure location and the failure state. Therefore, an object of the present invention is to provide a battery control device that makes it possible to detect a failure location and a failure state of an assembled battery voltage measurement circuit.

本発明に記載の組電池電圧測定装置（１４０）は、複数の二次電池（１１１）を直列に接続した組電池（１１２ａ、１１２ｂ）の電圧を測定し、組電池電圧測定装置（１４０）は、電源ライン（１１３）に直列に接続される複数個の直列抵抗（１４１、１４００）と、前記直列抵抗の末端で接続されるグランド側分圧抵抗（１４１０）と、を有し、前記直列抵抗（１４１）のうち、１か所が抵抗が二直列二並列の回路（１４０１，１４０２，１４０３，１４０４）であり、前記グランド側分圧抵抗（１４１１，１４１２）は、抵抗が二並列となる回路であることを特徴とする   The assembled battery voltage measuring device (140) according to the present invention measures the voltage of an assembled battery (112a, 112b) in which a plurality of secondary batteries (111) are connected in series, and the assembled battery voltage measuring device (140) A plurality of series resistors (141, 1400) connected in series to the power supply line (113), and a ground side voltage dividing resistor (1410) connected at an end of the series resistor, the series resistor In (141), one is a circuit (1401, 1402, 1403, 1404) with two series and two parallel resistors, and the ground side voltage dividing resistors (1411, 1412) are circuits with two parallel resistors. It is characterized by

本発明によれば、複雑な回路、制御を追加せずに、組電池電圧測定回路の故障状態検出が可能な電池制御装置を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the battery control apparatus which can detect the failure state of an assembled battery voltage measurement circuit can be provided, without adding a complicated circuit and control.

上記した以外の課題、構成及び効果は、以下の実施形態の説明により明らかにされる。   Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

本発明を示す電池制御装置とその周辺の構成を示す図。The figure which shows the structure of the battery control apparatus which shows this invention, and its periphery. 図１に示す電池電圧測定回路とその周辺の回路構成を示す図。The figure which shows the battery voltage measuring circuit shown in FIG. 1, and its periphery circuit structure. 従来の電池電圧測定回路とその周辺の回路構成を示す図。The figure which shows the conventional battery voltage measurement circuit and its peripheral circuit structure. 従来の電池電圧測定回路と本発明の電池電圧測定回路の結果の違いを示す図。The figure which shows the difference of the result of the conventional battery voltage measuring circuit and the battery voltage measuring circuit of this invention.

以下、実施例を図面を用いて説明する。   Hereinafter, examples will be described with reference to the drawings.

実施例１では、プラグインハイブリット自動車（ＰＨＥＶ）、電気自動車（ＥＶ）に搭載される電池制御装置に対して本発明を適用した場合を例に挙げて説明する。   In the first embodiment, a case where the present invention is applied to a battery control device mounted on a plug-in hybrid vehicle (PHEV) or an electric vehicle (EV) will be described as an example.

図１は、電池制御装置１００とその周辺の構成を示す図である。電池制御装置１００は、モータジェネレータ４１０をＰＷＭ制御するインバータ４００に、リレー３００、３１０を介して接続される。車両制御部２００は、組電池制御部１５０、インバータ４００と通信する。   FIG. 1 is a diagram illustrating a configuration of the battery control device 100 and its periphery. Battery control device 100 is connected to inverter 400 that performs PWM control of motor generator 410 via relays 300 and 310. The vehicle control unit 200 communicates with the assembled battery control unit 150 and the inverter 400.

図１の二点鎖で示される領域は電池制御装置１００であり、組電池１１０、単電池管理部１２０、組電池制御部１６０、フォトカプラに代表される絶縁素子１３０を備える。   A region indicated by a two-dot chain in FIG. 1 is a battery control device 100, and includes an assembled battery 110, a single battery management unit 120, an assembled battery control unit 160, and an insulating element 130 typified by a photocoupler.

組電池１１０は、複数の単電池群１１２から構成されている。ここでは２つの単電池群から構成されている場合、すなわち単電池群１１２ａ、１１２ｂ（以下、総称して符号１１２とする場合もある）から構成されている場合を示している。各単電池郡１１２は、複数の単電池１１１から構成される。   The assembled battery 110 includes a plurality of single battery groups 112. Here, the case where it is configured from two unit cell groups, that is, the case where it is configured from unit cell groups 112a and 112b (hereinafter may be collectively referred to as reference numeral 112) is shown. Each unit cell group 112 includes a plurality of unit cells 111.

単電池管理部１２０は、単電池群１１２ａと１１２ｂに対応する単電池制御部１２１ａと１２１ｂ（以下、総称して符号１２１とする場合もある）を備えている。単電池制御部１２１は、単電池群１１２を構成する単電池１１１の電池電圧や温度などの測定、異常が生じていないかの監視等を行う。   The unit cell management unit 120 includes unit cell control units 121a and 121b corresponding to the unit cell groups 112a and 112b (hereinafter may be collectively referred to as reference numeral 121). The unit cell control unit 121 measures the battery voltage and temperature of the unit cells 111 constituting the unit cell group 112, monitors whether or not an abnormality has occurred, and the like.

単電池管理部１２０は、単電池制御１２１を管理することで、間接的に単電池１１１を管理する。   The unit cell management unit 120 manages the unit cell 111 indirectly by managing the unit cell control 121.

組電池制御部１６０は、単電池管理部１２０が絶縁素子１３０を介して送信する単電池１１１の電池電圧、温度情報を受信し、車両制御部２００とは組電池制御情報の送受信を行う。また単電池１１１の電池電圧情報とは別に組電池電圧を、プラス側組電池電圧測定回路１４０a、マイナス側組電池電圧測定回路１４０ｂ（以下、総称して符号１４０とする場合もある）を経由して入力する。本発明の総電圧検回１４０路は当該プラス側組電池電圧測定回路１４０aとマイナス側組電池電圧測定回路１４０ｂの二つを指す。   The assembled battery control unit 160 receives the battery voltage and temperature information of the single cell 111 transmitted from the single cell management unit 120 via the insulating element 130, and transmits and receives the assembled battery control information to and from the vehicle control unit 200. In addition to the battery voltage information of the unit cell 111, the assembled battery voltage is passed through a plus-side assembled battery voltage measurement circuit 140a and a minus-side assembled battery voltage measurement circuit 140b (hereinafter sometimes collectively referred to as reference numeral 140). Enter. The total voltage test circuit 140 of the present invention refers to the plus side assembled battery voltage measuring circuit 140a and the minus side assembled battery voltage measuring circuit 140b.

車両制御部２００は、組車両電池制御部１６０から受信した情報を用いて、インバータ４００を制御する。車両走行中、電池制御装置１００はインバータ４００と接続され、組電池１１０が蓄えているエネルギーを用いて、モータジェネレータ４１０を駆動する。   The vehicle control unit 200 controls the inverter 400 using the information received from the assembled vehicle battery control unit 160. During traveling of the vehicle, the battery control device 100 is connected to the inverter 400 and drives the motor generator 410 using the energy stored in the assembled battery 110.

電池制御装置１００を搭載した車両システムが始動して走行する場合には、車両制御部２００の管理のもと、電池制御装置１００はインバータ４００に接続され、組電池１１０が蓄えているエネルギーを用いてモータジェネレータ４１０を駆動し、回生時はモータジェネレータ４１０の発電電力により組電池１１０が充電される。   When the vehicle system equipped with the battery control device 100 starts and runs, the battery control device 100 is connected to the inverter 400 under the management of the vehicle control unit 200 and uses the energy stored in the assembled battery 110. Then, the motor generator 410 is driven, and the battery pack 110 is charged by the power generated by the motor generator 410 during regeneration.

図２は従来の電池制御装置１００の組電池電圧測定回路１４０の回路構成を示す図である（プラス側組電池電圧測定回路１４０a、マイナス側組電池電圧測定回路１４０ｂは同一回路構成であり、以下説明はプラス側組電池電圧測定回路１４０aを例とする。）。組電池１１０の電圧を同一抵抗値複数個で構成された直列抵抗１４１、１４００（ここでは同一抵抗が１０直列で構成された場合で説明している）とグランド側分圧抵抗１４１０でマイコン等に代表される組電池制御部１６０のアナログ入力端子の入力レベルに収まるよう分圧する。なお、抵抗値については直列抵抗の方がグランド側分圧抵抗よりも大きなものが用いられる。この回路構成の場合、直列抵抗１４１、１４００又はグランド側分圧抵抗１４１０に故障があった場合、組電池制御部１６０に入力される電圧と、単電池管理部１２０から送られた電池電圧情報との差が発生し、この差をそれぞれが持つ誤差範囲で比較することで、組電池電圧測定回路１４０に故障が発生したことがわかる。   FIG. 2 is a diagram showing a circuit configuration of an assembled battery voltage measurement circuit 140 of the conventional battery control apparatus 100 (the plus side assembled battery voltage measurement circuit 140a and the minus side assembled battery voltage measurement circuit 140b have the same circuit configuration. The description is given by taking the plus side assembled battery voltage measurement circuit 140a as an example.) The voltage of the assembled battery 110 is connected to a microcomputer or the like by series resistors 141 and 1400 (in the case where the same resistor is configured in 10 series) configured by a plurality of resistors having the same resistance value and a ground side voltage dividing resistor 1410. The voltage is divided so as to be within the input level of the analog input terminal of the assembled battery control unit 160 represented. As for the resistance value, the series resistance is larger than the ground-side voltage dividing resistance. In the case of this circuit configuration, when there is a failure in the series resistors 141, 1400 or the ground side voltage dividing resistor 1410, the voltage input to the assembled battery control unit 160, the battery voltage information sent from the unit cell management unit 120, It is found that a failure has occurred in the assembled battery voltage measurement circuit 140 by comparing the differences within the error ranges of the differences.

たとえば単電池管理部１２０から送られた電池電圧情報が設計仕様で２％の誤差を持ち、組電池電圧測定回路１４０が設計仕様で５％の誤差をもっていた場合、それぞれの電圧測定結果の差が３％を超えると組電池電圧測定回路１４０が故障していることがわかる。ただしこの場合故障箇所によっては電圧測定の結果が同じになるため、故障箇所、故障状態は判定できない。図２の組電池電圧測定回路１４０では、直列抵抗１４１、１４００のどれか1個が開放故障した場合とグランド側分圧抵抗１４１０が短絡故障した場合はどちらも電圧がほぼ０Ｖとなる。   For example, if the battery voltage information sent from the single cell management unit 120 has an error of 2% in the design specification and the assembled battery voltage measurement circuit 140 has an error of 5% in the design specification, the difference between the voltage measurement results is If it exceeds 3%, it turns out that the assembled battery voltage measurement circuit 140 is out of order. However, in this case, the result of voltage measurement is the same depending on the failure location, so the failure location and failure status cannot be determined. In the assembled battery voltage measuring circuit 140 of FIG. 2, the voltage is almost 0 V when any one of the series resistors 141 and 1400 has an open failure and when the ground-side voltage dividing resistor 1410 has a short-circuit failure.

図３は本発明を表す電池制御装置１００の組電池電圧測定回路１４０の回路構成を示す図である（プラス側組電池電圧測定回路１４０a、マイナス側組電池電圧測定回路１４０ｂは同一回路構成であり、以下説明はプラス側組電池電圧測定回路１４０aを例とする。）。組電池電圧測定回路１４０は同一抵抗値で構成された分圧抵抗１４１（ここでは９直列）と、二直二並列分圧抵１４０１、１４０２、１４０３、１４０４、）を直列に接続し、グランド側の二並列分圧抵抗１４１１，１４１２と組み合わせることでで、組電池１１０の電圧を二直二並列分圧抵１４０１、１４０２、１４０３、１４０４、および二並列分圧抵抗１４１１，１４１２の故障箇所、故障状態に応じた電圧値に分圧させ、単電池管理部１２０との電圧比較により組電池電圧測定回路１４０の分圧抵抗故障箇所、故障状態を検出する。たとえば単電池管理部１２０から送られた電池電圧情報が設計仕様で２％の誤差を持ち、組電池電圧測定回路１４０が設計仕様で５％の誤差をもっていた場合、それぞれの電圧測定結果の差が３％を超えると組電池電圧測定回路１４０が故障していることがわかる。さらに本発明では二直二並列分圧抵１４０１、１４０２、１４０３、１４０４のどれかひとつが開放故障した場合は正常値に対し５％低下、二直二並列分圧抵１４０１、１４０２、１４０３、１４０４のどれかひとつが短絡故障した場合は正常値に対し５％上昇、二並列分圧抵抗１４１１，１４１２のどちらかが開放故障した場合は正常値に対し９９％上昇（ほぼ２倍）、二並列分圧抵抗１４１１，１４１２のどちらかが短絡故障した場合は正常値に対し９９％低下（ほぼ０Ｖ）となり、故障箇所、故障状態の検出が可能となる。   FIG. 3 is a diagram showing a circuit configuration of the assembled battery voltage measuring circuit 140 of the battery control device 100 representing the present invention (the plus side assembled battery voltage measuring circuit 140a and the minus side assembled battery voltage measuring circuit 140b have the same circuit configuration). In the following description, the positive side assembled battery voltage measurement circuit 140a is taken as an example.) The assembled battery voltage measurement circuit 140 is configured by connecting a voltage dividing resistor 141 (9 series in this case) having the same resistance value and two series-two parallel voltage dividing resistors 1401, 1402, 1403, 1404) in series, and connecting the ground side In combination with the two parallel voltage dividing resistors 1411 and 1412, the voltage of the assembled battery 110 is changed to the failure part of the two series and two parallel voltage dividing resistors 1401, 1402, 1403 and 1404, and the two parallel voltage dividing resistors 1411 and 1412. The voltage value is divided according to the state, and the voltage dividing resistance failure part and the failure state of the assembled battery voltage measurement circuit 140 are detected by voltage comparison with the unit cell management unit 120. For example, if the battery voltage information sent from the single cell management unit 120 has an error of 2% in the design specification and the assembled battery voltage measurement circuit 140 has an error of 5% in the design specification, the difference between the voltage measurement results is If it exceeds 3%, it turns out that the assembled battery voltage measurement circuit 140 is out of order. Further, in the present invention, when any one of the two-series / two-parallel voltage dividers 1401, 1402, 1403, 1404 is open-circuited, the normal value is reduced by 5%, and the two-series / two-parallel voltage dividers 1401, 1402, 1403, 1404 are reduced. If one of the two fails, it will increase by 5% compared to the normal value. If one of the two parallel voltage dividing resistors 1411 and 1412 fails, it will increase by 99% compared to the normal value (almost twice). When either one of the voltage dividing resistors 1411 and 1412 is short-circuited, the voltage is reduced by 99% (approximately 0 V) with respect to the normal value, and the failure location and the failure state can be detected.

図４に簡単に結果をまとめる。図４は従来回路と本発明の回路で故障時に、正常時に測定される値からどの程度変化するのかをまとめた図である。この図から明らかなように、本発明の総電圧検出回路を用いることによって、直列抵抗の開放故障、直列抵抗の短絡故障、グランド側分圧抵抗の開放故障、グランド側分圧抵抗の短絡故障の４つの故障モードでそれぞれ違う測定結果とすることができる。したがって、複雑な回路、制御を追加せずに、組電池電圧測定回路の故障状態検出が可能な電池制御装置を提供することができる。   The results are summarized in FIG. FIG. 4 is a diagram summarizing how much the measured value changes from the value measured in the normal state when a failure occurs in the conventional circuit and the circuit of the present invention. As is apparent from this figure, by using the total voltage detection circuit of the present invention, series resistance open fault, series resistance short circuit fault, ground side voltage dividing resistor open fault, ground side voltage dividing resistance short circuit fault Different measurement results can be obtained for each of the four failure modes. Therefore, it is possible to provide a battery control device capable of detecting a failure state of the assembled battery voltage measurement circuit without adding complicated circuits and controls.

以上、本発明についてまとめる。本発明に記載の組電池電圧測定装置（１４０）は、複数の二次電池（１１１）を直列に接続した組電池（１１２ａ、１１２ｂ）の電圧を測定し、組電池電圧測定装置（１４０）は、電源ライン（１１３）に直列に接続される複数個の直列抵抗（１４１、１４００）と、前記直列抵抗の末端で接続されるグランド側分圧抵抗（１４１０）と、を有し、前記直列抵抗（１４１）のうち、１か所が抵抗が二直列二並列の回路（１４０１，１４０２，１４０３，１４０４）であり、前記グランド側分圧抵抗（１４１１，１４１２）は、抵抗が二並列となる回路であることを特徴とする。このような構成にすることによって、複雑な回路、制御を追加せずに、組電池電圧測定回路の故障状態検出が可能な電池制御装置を提供することができる。
また、さらなる特徴として、本発明の電池制御装置は、組電池電圧測定装置（１４０）と組電池（１１２ａ、１１２ｂ）とを備える。 The present invention has been summarized above. The assembled battery voltage measuring device (140) according to the present invention measures the voltage of an assembled battery (112a, 112b) in which a plurality of secondary batteries (111) are connected in series, and the assembled battery voltage measuring device (140) A plurality of series resistors (141, 1400) connected in series to the power supply line (113), and a ground side voltage dividing resistor (1410) connected at an end of the series resistor, the series resistor In (141), one is a circuit (1401, 1402, 1403, 1404) with two series and two parallel resistors, and the ground side voltage dividing resistors (1411, 1412) are circuits with two parallel resistors. It is characterized by being. With such a configuration, it is possible to provide a battery control device capable of detecting a failure state of the assembled battery voltage measurement circuit without adding complicated circuits and control.
As a further feature, the battery control device of the present invention includes an assembled battery voltage measuring device (140) and assembled batteries (112a, 112b).

以上、本発明の実施形態について詳述したが、本発明は、前記の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の精神を逸脱しない範囲で、種々の設計変更を行うことができるものである。例えば、前記した実施の形態は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることが可能であり、また、ある実施形態の構成に他の実施形態の構成を加えることも可能である。さらに、各実施形態の構成の一部について、他の構成の追加・削除・置換をすることが可能である。   Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. Furthermore, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

１００・・・電池制御装置
１１０・・・組電池
１１１・・・単電池
１１２・・・単電池群
１１３・・・電源ライン
１２０・・・単電池管理部
１２１・・・単電池制御部
１３０・・・絶縁素子
１４０・・・プラス側組電池電圧測定回路
１４１、１４００・・・プラス側組電池電圧測定回路の直列分圧抵抗
１４１０・・・プラス側組電池電圧測定回路グランド側分圧抵抗
１４０１、１４０２、１４０３、１４０４・・・プラス側組電池電圧測定回路の二直二並列分圧抵抗
１４１１、１４１２・・・プラス側組電池電圧測定回路グランド側の二並列分圧抵抗
１４１ｂ・・・マイナス側組電池電圧測定回路
１５０ａ、１６０・・・組電池制御部
２００・・・車両制御部
３００・・・リレー
３１０・・・リレー
４００・・・インバータ
４１０・・・モータジェネレータ DESCRIPTION OF SYMBOLS 100 ... Battery control apparatus 110 ... Assembly battery 111 ... Single cell 112 ... Single cell group 113 ... Power supply line 120 ... Single cell management part 121 ... Single battery control part 130- .. Insulating element 140... Plus side assembled battery voltage measuring circuit 141, 1400... Series voltage dividing resistor 1410 of plus side assembled battery voltage measuring circuit... Plus side assembled battery voltage measuring circuit Ground side voltage dividing resistor 1401 1402, 1403, 1404... Two series-two parallel voltage dividing resistors 1411, 1412... Plus side assembled battery voltage measuring circuit. Two parallel voltage dividing resistors 141 b on the ground side minus. Side assembled battery voltage measurement circuit 150a, 160 ... assembled battery control unit 200 ... vehicle control unit 300 ... relay 310 ... relay 400 ... inverter 410 ... mode Generator

Claims (2)

複数の二次電池を直列に接続した組電池の電圧を測定する組電池電圧測定装置において、
前記組電池電圧測定装置は、電源ラインに直列に接続される複数個の直列抵抗と、前記直列抵抗の末端で接続されるグランド側分圧抵抗と、を有し、
前記直列抵抗のうち、１か所の抵抗が二直列二並列の回路であり、
前記グランド側分圧抵抗は、抵抗が二並列となる回路であることを特徴とする組電池電圧測定装置。 In an assembled battery voltage measuring device for measuring the voltage of an assembled battery in which a plurality of secondary batteries are connected in series,
The assembled battery voltage measuring device has a plurality of series resistors connected in series to a power supply line, and a ground side voltage dividing resistor connected at an end of the series resistor,
One of the series resistors is a two-series two-parallel circuit,
The assembled battery voltage measuring device, wherein the ground-side voltage dividing resistor is a circuit having two resistors in parallel. 請求項１に記載の組電池電圧測定装置と、組電池とを備える電源装置。   A power supply apparatus comprising the assembled battery voltage measuring device according to claim 1 and an assembled battery.
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