JP2020078181A

JP2020078181A - Voltage detection device

Info

Publication number: JP2020078181A
Application number: JP2018210227A
Authority: JP
Inventors: 真吾槌矢; Shingo Tsuchiya; 鎌田　誠二; Seiji Kamata; 誠二鎌田
Original assignee: Keihin Corp
Current assignee: Keihin Corp
Priority date: 2018-11-08
Filing date: 2018-11-08
Publication date: 2020-05-21

Abstract

To suppress the voltage drop in a shared line between the high voltage side and the low voltage side when the number of battery cells is different between the high voltage side and the low voltage side.SOLUTION: A voltage detection device includes a plurality of battery modules that are provided with a plurality of battery cells and are connected in series with each other, and a module voltage detection circuit that is provided for each battery module and detects voltages of the plurality of battery cells as cell voltages, and a shared line that spans a high voltage side circuit and a low voltage side circuit formed of a pair of a battery module and a module voltage detection circuit that are adjacent to each other is branched and wired in a connector provided between the module voltage detection circuit for the high voltage side circuit and the module voltage detection circuit for the low voltage side circuit.SELECTED DRAWING: Figure 1

Description

本発明は、電圧検出装置に関する。 The present invention relates to a voltage detection device.

下記特許文献１には、複数のセルグループから構成された組電池について、各電池の電圧をセルグループ毎に設けられたセル監視回路で検出する電池監視装置が開示されている。 Patent Document 1 below discloses a battery monitoring device that detects a voltage of each battery in a battery pack including a plurality of cell groups by a cell monitoring circuit provided for each cell group.

特開２０１１−０９５０７６号公報JP, 2011-095076, A

ところで、上記従来技術では、各セルグループが同一数の電池セルを備えているので、高電圧側回路と低電圧側回路とに跨る共用ラインについて着目すると、高電圧側回路の電流と低電圧側回路の電流との向きが互いに逆向きかつ値が等しいので、特許文献１の図２に示されているように共用ラインには電流が流れない。したがって、共用ラインにおける電圧降下は発生せず、最高電圧側回路と最低電圧側回路との間に位置するセル監視回路は、最高電圧側回路のセル監視回路や最低電圧側回路のセル監視回路のような補正回路を必要としない。 By the way, in the above-mentioned conventional technology, since each cell group is provided with the same number of battery cells, when focusing on the shared line extending over the high voltage side circuit and the low voltage side circuit, the current and the low voltage side of the high voltage side circuit Since the directions of the circuit and the current are opposite to each other and the values are the same, no current flows in the shared line as shown in FIG. 2 of Patent Document 1. Therefore, no voltage drop occurs in the shared line, and the cell monitoring circuit located between the highest voltage side circuit and the lowest voltage side circuit is the same as the cell monitoring circuit of the highest voltage side circuit or the lowest voltage side circuit. No such correction circuit is required.

しかしながら、例えば組電池の出力電圧によっては電池セル数が異なる複数のセルグループを用いて組電池を構成する場合がある。この場合には、共用ラインに流れる高電圧側回路の電流と低電圧側回路の電流との値が異なるので、共用ラインには電流が流れ、補正回路が必要となる。 However, for example, the assembled battery may be configured using a plurality of cell groups having different numbers of battery cells depending on the output voltage of the assembled battery. In this case, since the currents of the high-voltage side circuit and the low-voltage side circuit flowing in the shared line have different values, current flows in the shared line and a correction circuit is required.

本発明は、上述した事情に鑑みてなされたものであり、高電圧側と低電圧側とで電池セル数が異なる場合に高電圧側と低電圧側との共用ラインにおける電圧降下を抑制することを目的とする。 The present invention has been made in view of the above circumstances, and suppresses a voltage drop in a shared line between a high voltage side and a low voltage side when the number of battery cells is different between the high voltage side and the low voltage side. With the goal.

上記目的を達成するために、本発明では、複数の電池セルを備え、互いに直列接続される複数の電池モジュールと、該電池モジュール毎に設けられ、複数の前記電池セルの電圧をセル電圧として検出するモジュール電圧検出回路とを備え、互いに隣り合うと共に前記電池モジュールと前記モジュール電圧検出回路とのペアからなる高電圧側回路と低電圧側回路とに跨る共通ラインは、前記高電圧側回路の前記モジュール電圧検出回路と前記低電圧側回路の前記電池モジュールとが前記電池モジュールとの間に設けられたコネクタにおいて分岐配線されている、という手段を採用する。 In order to achieve the above object, in the present invention, a plurality of battery modules, which are provided with a plurality of battery cells and are connected in series with each other, are provided for each battery module, and the voltage of the plurality of battery cells is detected as a cell voltage. And a module voltage detection circuit, and a common line extending across a high-voltage side circuit and a low-voltage side circuit that are adjacent to each other and that consist of a pair of the battery module and the module voltage detection circuit is the high-voltage side circuit. A means is adopted in which the module voltage detection circuit and the battery module of the low-voltage side circuit are branched and wired in a connector provided between the module module and the battery module.

本発明によれば、高電圧側と低電圧側とで電池セル数が異なる場合に高電圧側と低電圧側との共用ラインにおける電圧降下を抑制することが可能である。 According to the present invention, when the number of battery cells is different between the high voltage side and the low voltage side, it is possible to suppress the voltage drop in the shared line between the high voltage side and the low voltage side.

本発明の一実施形態に係る電圧検出装置の構成を示す回路図である。It is a circuit diagram which shows the structure of the voltage detection apparatus which concerns on one Embodiment of this invention.

以下、図面を参照して、本発明の一実施形態について説明する。
本実施形態に係る電圧検出装置Ａは、セル数が異なる２つ（複数）の電池モジュールＢＭ１，ＢＭ２を被検出対象とするものであり、図１に示すように複数のコネクタＴ１〜Ｔ１８，Ｕ１〜Ｕ１２、複数のフィルタ回路Ｆ１〜Ｆ１８，２つの電圧検出回路Ｌ１，Ｌ２を備えている。 An embodiment of the present invention will be described below with reference to the drawings.
The voltage detection device A according to the present embodiment targets two (plural) battery modules BM1 and BM2 having different numbers of cells as detection targets, and as illustrated in FIG. 1, a plurality of connectors T1 to T18 and U1. To U12, a plurality of filter circuits F1 to F18, and two voltage detection circuits L1 and L2.

２つの電池モジュールＢＭ１，ＢＭ２は、何れも複数の電池セルｂ１〜ｂ１８，ｃ１〜ｃ１２を備える組電池である。このような２つの電池モジュールＢＭ１，ＢＭ２は、互いに直列接続されており、一体として１つのバッテリを構成している。２つの電池モジュールＢＭ１，ＢＭ２のうち、第１の電池モジュールＢＭ１は、合計１８個の電池セルｂ１〜ｂ１８が直列接続されたものであり、第２の電池モジュールＢＭ２は、合計１２個の電池セルｃ１〜ｃ１２が直列接続されたものである。すなわち、第１の電池モジュールＢＭ１と第２の電池モジュールＢＭ２とでは、電池セル数が異なっている。 Each of the two battery modules BM1 and BM2 is an assembled battery including a plurality of battery cells b1 to b18 and c1 to c12. Such two battery modules BM1 and BM2 are connected in series to each other and integrally form one battery. Of the two battery modules BM1 and BM2, the first battery module BM1 has a total of 18 battery cells b1 to b18 connected in series, and the second battery module BM2 has a total of 12 battery cells. c1 to c12 are connected in series. That is, the number of battery cells is different between the first battery module BM1 and the second battery module BM2.

複数のコネクタＴ１〜Ｔ１８，Ｕ１〜Ｕ１２は、雄コネクタと雌コネクタとから構成されており、２つの電池モジュールＢＭ１，ＢＭ２を電圧検出装置Ａに着脱自在に接続する。すなわち、第１の電池モジュールＢＭ１の各電極は専用のワイヤハーネス及び雄コネクタを介してコネクタＴ１〜Ｔ１８の雌コネクタに接続され、第２の電池モジュールＢＭ２は専用のワイヤハーネス及び雄コネクタを介してコネクタＵ１〜Ｕ１２の雌コネクタに接続される。 The plurality of connectors T1 to T18 and U1 to U12 are composed of a male connector and a female connector, and two battery modules BM1 and BM2 are detachably connected to the voltage detection device A. That is, each electrode of the first battery module BM1 is connected to the female connectors of the connectors T1 to T18 via a dedicated wire harness and male connector, and the second battery module BM2 is connected via a dedicated wire harness and male connector. It is connected to the female connectors of the connectors U1 to U12.

複数のフィルタ回路Ｆ１〜Ｆ１８，Ｇ１〜Ｇ１２は、入力端が上記コネクタＴ１〜Ｔ１８，Ｕ１〜Ｕ１２に接続されると共に出力端が電圧検出回路Ｌ１，Ｌ２の各入力端に接続されるローパスフィルタである。これらフィルタ回路Ｆ１〜Ｆ１８，Ｇ１〜Ｇ１２は、コネクタＴ１〜Ｔ１８，Ｕ１〜Ｕ１２から入力される電圧信号に含まれる高周波ノイズを除去して電圧検出回路Ｌ１，Ｌ２の各電圧入力端Ｃ１〜Ｃ１８，Ｃ１〜Ｃ１２に出力する。 The plurality of filter circuits F1 to F18 and G1 to G12 are low-pass filters whose input ends are connected to the connectors T1 to T18 and U1 to U12 and whose output ends are connected to the respective input ends of the voltage detection circuits L1 and L2. is there. These filter circuits F1 to F18 and G1 to G12 remove high frequency noise included in the voltage signals input from the connectors T1 to T18 and U1 to U12 to remove the high frequency noises from the voltage detection circuits L1 and L2. Output to C1 to C12.

２つの電圧検出回路Ｌ１，Ｌ２は、上記各電圧入力端Ｃ１〜Ｃ１８，Ｃ１〜Ｃ１２に入力される各電池セルｂ１〜ｂ１８，ｃ１〜ｃ１２の電極電圧に基づいて各電池セルｂ１〜ｂ１８，ｃ１〜ｃ１２の電極間電圧つまりセル電圧を検出する集積回路である。これた２つの電圧検出回路Ｌ１，Ｌ２は、本発明のモジュール電圧検出回路に相当する。 The two voltage detection circuits L1 and L2 are based on the electrode voltages of the battery cells b1 to b18 and c1 to c12 input to the voltage input terminals C1 to C18 and C1 to C12, respectively. It is an integrated circuit that detects a voltage between electrodes of c12, that is, a cell voltage. These two voltage detection circuits L1 and L2 correspond to the module voltage detection circuit of the present invention.

また、これら２つの電圧検出回路Ｌ１，Ｌ２のうち、第１の電圧検出回路Ｌ１は、図示するように２つのコネクタＴＴ１，１８を介して第１の電池モジュールＢＭ１から電源端子Ｖｃｃ及び接地端子ＧＮＤに供給される第１モジュール電圧を電源として作動する。また、第２の電圧検出回路Ｌ２は、コネクタＵ１，Ｕ１２を介して第２の電池モジュールＢＭ２から電源端子Ｖｃｃ及び接地端子ＧＮＤに供給される第２モジュール電圧を電源として作動する。 Also, of these two voltage detection circuits L1 and L2, the first voltage detection circuit L1 is, as shown in the figure, the power supply terminal Vcc and the ground terminal GND from the first battery module BM1 via the two connectors TT1 and TT18. The first module voltage supplied to the power source operates as a power source. In addition, the second voltage detection circuit L2 operates using the second module voltage supplied from the second battery module BM2 to the power supply terminal Vcc and the ground terminal GND via the connectors U1 and U12 as a power supply.

さらに、これら２つの電圧検出回路Ｌ１，Ｌ２は、上述した電圧入力端Ｃ１〜Ｃ１８，Ｃ１〜Ｃ１２に加えて、複数のコネクタＴ１〜Ｔ１８，Ｕ１〜Ｕ１２にそれぞれ接続される複数の出力端ＳＷ１〜ＳＷ１８，ＳＷ１〜ＳＷ１２を備えている。２つの電圧検出回路Ｌ１，Ｌ２は、これら出力端ＳＷ１〜ＳＷ１８，ＳＷ１〜ＳＷ１２を内部回路を介して接地することにより、各電池セルｂ１〜ｂ１８，ｃ１〜ｃ１２を強制放電させる。 Further, these two voltage detection circuits L1 and L2 include, in addition to the voltage input terminals C1 to C18 and C1 to C12 described above, a plurality of output terminals SW1 to SW1 connected to a plurality of connectors T1 to T18 and U1 to U12, respectively. SW18 and SW1 to SW12 are provided. The two voltage detection circuits L1 and L2 forcibly discharge the battery cells b1 to b18 and c1 to c12 by grounding the output terminals SW1 to SW18 and SW1 to SW12 via an internal circuit.

ここで、図１に示すように、上述した複数のコネクタＴ１〜Ｔ１８，Ｕ１〜Ｕ１２のうち、コネクタＴ１は、雄コネクタが第１の電池モジュールＢＭ１において最も低い電圧に相当する電池セルｂ１のマイナス電極かつ第２の電池モジュールＢＭ２において最も高い電圧に相当する電池セルｃ１２のプラス電極に共通接続されており、雌コネクタが第１の電圧検出回路Ｌ１のＧＮＤ端子かつ第２の電圧検出回路Ｌ２の電源端子に供接続されている。 Here, as shown in FIG. 1, among the plurality of connectors T1 to T18 and U1 to U12 described above, the connector T1 is a negative one of the battery cell b1 whose male connector corresponds to the lowest voltage in the first battery module BM1. The electrode and the positive electrode of the battery cell c12 corresponding to the highest voltage in the second battery module BM2 are commonly connected, and the female connector is the GND terminal of the first voltage detection circuit L1 and the second voltage detection circuit L2. It is connected to the power supply terminal.

このようなコネクタＴ１と、上記電池セルｂ１のマイナス電極、電池セルｃ１２のプラス電極、第１の電圧検出回路Ｌ１のＧＮＤ端子及び第２の電圧検出回路Ｌ２の電源端子とを相互に接続する接続ラインは、本発明における共通ラインに相当する。 A connection for mutually connecting the connector T1 and the minus electrode of the battery cell b1, the plus electrode of the battery cell c12, the GND terminal of the first voltage detection circuit L1 and the power supply terminal of the second voltage detection circuit L2. The line corresponds to the common line in the present invention.

すなわち、この共通ラインは、互いに隣り合うと共に第１の電池モジュールＢＭ１と第１の電圧検出回路Ｌ１とのペアからなる高電圧側回路と、互いに隣り合うと共に第２の電池モジュールＢＭ２と第２の電圧検出回路Ｌ２とのペアからなる低電圧側回路とに跨るものであり、高電圧側回路の第１の電圧検出回路Ｌ１と低電圧側回路の第２の電圧検出回路Ｌ２とが第１の電池モジュールＢＭ１及び第２の電池モジュールＢＭ２との間に設けられたコネクタＴ１において分岐配線されたものである。 That is, the common line is adjacent to each other and the high-voltage side circuit formed of the pair of the first battery module BM1 and the first voltage detection circuit L1 is adjacent to each other and the second battery module BM2 and the second line. The first voltage detection circuit L1 of the high-voltage side circuit and the second voltage detection circuit L2 of the low-voltage side circuit extend over the low-voltage side circuit formed of a pair with the voltage detection circuit L2. The connector T1 provided between the battery module BM1 and the second battery module BM2 is branched and wired.

次に、本実施形態に係る電圧検出装置Ａの動作について詳しく説明する。
この電圧検出装置Ａでは、第１の電池モジュールＢＭ１を構成する電池セルｂ１〜ｂ１８の各セル電圧が第１の電圧検出回路Ｌ１によって検出され、第２の電池モジュールＢＭ２を構成する電池セルｃ１〜ｃ１２の各セル電圧が第２の電圧検出回路Ｌ２によって検出される。 Next, the operation of the voltage detection device A according to this embodiment will be described in detail.
In this voltage detection device A, the cell voltages of the battery cells b1 to b18 that form the first battery module BM1 are detected by the first voltage detection circuit L1, and the battery cells c1 to c1 that form the second battery module BM2. Each cell voltage of c12 is detected by the second voltage detection circuit L2.

また、この電圧検出装置Ａでは、第１の電圧検出回路Ｌ１は、２つのコネクタＴ１，Ｔ１８を介して第１の電池モジュールＢＭ１から電源端子Ｖｃｃ及び接地端子ＧＮＤに供給される第１モジュール電圧を電源とし、また第２の電圧検出回路Ｌ２は、２つのコネクタＵ１，Ｕ１２を介して第２の電池モジュールＢＭ２から電源端子Ｖｃｃ及び接地端子ＧＮＤに供給される第２モジュール電圧を電源として作動する。 Further, in this voltage detection device A, the first voltage detection circuit L1 supplies the first module voltage supplied from the first battery module BM1 to the power supply terminal Vcc and the ground terminal GND via the two connectors T1 and T18. The power supply is used, and the second voltage detection circuit L2 operates using the second module voltage supplied from the second battery module BM2 to the power supply terminal Vcc and the ground terminal GND via the two connectors U1 and U12 as the power supply.

ここで、第１の電池モジュールＢＭ１の電池セルｂ１〜ｂ１８の個数つまり「１８」と第２の電池モジュールＢＭ２の電池セルｃ１〜ｃ１２の個数つまり「１２」とが異なっているので、第１の電圧検出回路Ｌ１の接地端子ＧＮＤからコネクタＴ１を介して２つの電池モジュールＢＭ１，ＢＭ２に向かって流れる電流（第１電流）と、２つの電池モジュールＢＭ１，ＢＭ２からコネクタＴ１を介して第２の電圧検出回路Ｌ２の電源端子Ｖｃｃに向かって流れる電流（第２電流）とは値つまり大きさが異なる。 Here, since the number of battery cells b1 to b18 of the first battery module BM1, that is, “18”, and the number of battery cells c1 to c12 of the second battery module BM2, that is, “12” are different, A current (first current) flowing from the ground terminal GND of the voltage detection circuit L1 toward the two battery modules BM1 and BM2 via the connector T1 and a second voltage from the two battery modules BM1 and BM2 via the connector T1. The value, that is, the magnitude, is different from the current (second current) flowing toward the power supply terminal Vcc of the detection circuit L2.

しかしながら、この電圧検出装置Ａでは、共通ラインがコネクタＴ１から第１の電圧検出回路Ｌ１の接地端子ＧＮＤまでの間とコネクタＴ１から第２の電圧検出回路Ｌ２の電源端子Ｖｃｃまでの間で分岐しており、第１の電圧検出回路Ｌ１の接地端子ＧＮＤと第２の電圧検出回路Ｌ２の電源端子ＶｃｃとがコネクタＴ１の手前つまり２つの電圧検出回路Ｌ１，Ｌ２により近い位置で接続されて単一の接続線でコネクタＴ１に接続されている場合に比較して、第１電流に起因する共通ラインでの電圧降下及び第２電流に起因する共通ラインでの電圧降下を低減できる。また、ワイヤハーネスを削減できる。 However, in this voltage detection device A, the common line is branched between the connector T1 and the ground terminal GND of the first voltage detection circuit L1 and between the connector T1 and the power supply terminal Vcc of the second voltage detection circuit L2. Therefore, the ground terminal GND of the first voltage detection circuit L1 and the power supply terminal Vcc of the second voltage detection circuit L2 are connected in front of the connector T1, that is, at a position closer to the two voltage detection circuits L1 and L2. The voltage drop in the common line due to the first current and the voltage drop in the common line due to the second current can be reduced as compared with the case where the connection line is connected to the connector T1. Also, the wire harness can be reduced.

したがって、本実施形態によれば、高電圧側回路と低電圧側回路とで２つの電池モジュールＢＭ１，ＢＭ２の電池セル数が異なる場合であっても、高電圧側回路と低電圧側回路との共用ラインにおける電圧降下を抑制することが可能である。 Therefore, according to the present embodiment, even when the number of battery cells of the two battery modules BM1 and BM2 is different between the high-voltage side circuit and the low-voltage side circuit, the high-voltage side circuit and the low-voltage side circuit are different from each other. It is possible to suppress the voltage drop in the shared line.

Ａ電圧検出装置
ＢＭ１，ＢＭ２電池モジュール
Ｔ１〜Ｔ１８，Ｕ１〜Ｕ１２コネクタ
Ｆ１〜Ｆ１８，Ｇ１〜Ｇ１２フィルタ回路
Ｌ１，Ｌ２１電圧検出回路
Ｋａ〜Ｋｃ接続ライン
A voltage detection device BM1, BM2 battery module T1 to T18, U1 to U12 connectors F1 to F18, G1 to G12 filter circuit L1, L21 voltage detection circuit Ka to Kc connection line

Claims

A plurality of battery modules including a plurality of battery cells and connected in series with each other;
A module voltage detection circuit which is provided for each battery module and detects the voltage of the plurality of battery cells as a cell voltage,
A common line that is adjacent to each other and that spans a high-voltage side circuit and a low-voltage side circuit formed of a pair of the battery module and the module voltage detection circuit is a module voltage detection circuit of the high-voltage side circuit and the low-voltage side. A voltage detection device, wherein the battery module of the circuit is branched and wired in a connector provided between the battery module and the battery module.