JP2002050406A - Current detection device and battery device equipped with the same - Google Patents
Current detection device and battery device equipped with the sameInfo
- Publication number
- JP2002050406A JP2002050406A JP2000234691A JP2000234691A JP2002050406A JP 2002050406 A JP2002050406 A JP 2002050406A JP 2000234691 A JP2000234691 A JP 2000234691A JP 2000234691 A JP2000234691 A JP 2000234691A JP 2002050406 A JP2002050406 A JP 2002050406A
- Authority
- JP
- Japan
- Prior art keywords
- current
- amplifier
- battery
- current sensor
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 56
- 238000005259 measurement Methods 0.000 claims description 24
- 238000007599 discharging Methods 0.000 description 11
- 230000003321 amplification Effects 0.000 description 6
- 238000003199 nucleic acid amplification method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Secondary Cells (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主として、モータ
ーで自動車を走行させる電気自動車に使用される電流検
出装置と、この電流検出装置を備えるバッテリー装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current detecting device used for an electric vehicle driven by a motor, and a battery device provided with the current detecting device.
【０００２】[0002]
【従来の技術】自動車に搭載されるバッテリーは、残存
容量を監視しながら充放電を制御している。バッテリー
は、残存容量が約５０％の近傍となるように充放電させ
ると、劣化を最も少なくできる性質がある。したがっ
て、この方式は、バッテリーの劣化をできる限り少なく
して、長い年月にわたって使用できる特長が実現され
る。バッテリーの残存容量は、充放電電流を積算して演
算できる。充電電流の積算値は充電容量となり、放電電
流の積算値は放電容量となるので、充電容量から放電容
量を減算して残存容量を演算できる。2. Description of the Related Art A battery mounted on an automobile controls charging and discharging while monitoring the remaining capacity. The battery has the property of being able to minimize deterioration when charged and discharged so that the remaining capacity is close to about 50%. Therefore, this method realizes a feature that can be used for a long period of time while minimizing battery deterioration. The remaining capacity of the battery can be calculated by integrating the charge / discharge current. Since the integrated value of the charging current is the charging capacity and the integrated value of the discharging current is the discharging capacity, the remaining capacity can be calculated by subtracting the discharging capacity from the charging capacity.
【０００３】バッテリーの残存容量を正確に演算するた
めには、充放電電流を正確に検出する必要がある。充放
電電流を測定する誤差が残存容量に影響を与えるからで
ある。とくに、充放電電流を積算して残存容量を演算す
るので、充放電電流の検出誤差は、累積して残存容量の
誤差を大きくする。電流検出測定は、全ての測定範囲に
おいて、正確に電流値を検出するのが極めて難しい。こ
のため、従来の電流検出装置は、各々の装置に個別のオ
フセット値をあらかじめ測定し、検出した測定値をオフ
セット値で補正して正確に電流を検出している。しかし
ながら、電流検出装置のオフセット値は一定の値をいつ
までも保持できるとは限らず、経時的にずれることがあ
る。オフセット値がずれると正確に電流を測定できなく
なる。オフセット値のずれは、経年変化や温度特性の変
化が原因で発生する。In order to accurately calculate the remaining capacity of a battery, it is necessary to accurately detect a charge / discharge current. This is because an error in measuring the charge / discharge current affects the remaining capacity. In particular, since the remaining capacity is calculated by integrating the charging / discharging current, the detection error of the charging / discharging current is accumulated to increase the error of the remaining capacity. In the current detection measurement, it is extremely difficult to accurately detect a current value in the entire measurement range. For this reason, the conventional current detection device measures an individual offset value in advance for each device, corrects the detected measurement value with the offset value, and accurately detects the current. However, the offset value of the current detection device cannot always be maintained at a constant value, and may deviate with time. If the offset value deviates, the current cannot be measured accurately. The offset value shift occurs due to aging and changes in temperature characteristics.
【０００４】[0004]
【発明が解決しようとする課題】とくに、電池の充放電
の電流を検出する装置は、＋−フルスケールの領域で正
確に電流を検出する必要があって、広い範囲において高
い精度で電流を正確に検出するのは極めて難しい。さら
に、自動車用のバッテリーは、充電電流と放電電流値が
極めて大きいために、測定範囲が極めて大きく、全ての
範囲で正確に電流を検出するのがとくに難しい。さらに
また、自動車のバッテリーの充放電電流を検出する装置
においては、大電流の領域のみでなく小電流領域におい
ても正確に電流を測定することが大切である。たとえ
ば、−１５０Ａ〜＋１５０Ａの電流を測定する装置にお
いて、オフセットが２００ｍＡずれたと仮定しても、こ
の電流で数時間も充放電をさせると、残存容量に相当な
誤差が発生する。In particular, a device for detecting a charging / discharging current of a battery needs to accurately detect the current in a range of + -full scale, and accurately detects the current in a wide range. Is extremely difficult to detect. Further, a battery for automobiles has an extremely large charge current and a discharge current value, so that the measurement range is extremely large, and it is particularly difficult to accurately detect the current in the entire range. Furthermore, in a device for detecting the charge / discharge current of a battery of an automobile, it is important to accurately measure the current not only in a large current region but also in a small current region. For example, in a device for measuring a current of −150 A to +150 A, even if it is assumed that the offset is shifted by 200 mA, a considerable error occurs in the remaining capacity when the current is charged and discharged for several hours.
【０００５】以上のように、バッテリーの電流を検出す
る装置は、０点付近の検出誤差が残存容量の演算を大き
く狂わせてしまう弊害がある。０点付近の測定が正確で
ないと、充電と放電が逆に検出されることがあり、さら
に、間違って検出された充電または放電電流が累積して
残存容量を狂わせて誤差を大きくしてしまう。自動車を
走行させるバッテリーに限らず、電池の電流を検出する
装置は、充電電流と放電電流の両方を特に正確に検出す
る必要がある。As described above, in the device for detecting the current of the battery, there is a problem that the detection error near the point 0 greatly disturbs the calculation of the remaining capacity. If the measurement around the zero point is not accurate, charging and discharging may be detected in reverse, and furthermore, charging or discharging currents detected erroneously may accumulate, disturb the remaining capacity and increase the error. Not only the battery for running the automobile, but also a device for detecting the current of the battery needs to detect both the charging current and the discharging current particularly accurately.
【０００６】バッテリーの電流を検出する電流センサー
は、より精度を高くするために、高精度の部品を使用し
て、複雑な回路構成とする必要があり、さらに精密に調
整する必要があって、部品コストと製造コストが極めて
高くなってしまう。さらにまた、製造した直後において
は、正確に充電電流と放電電流の両方を正確に検出でき
るようにオフセット値を調整しても、経年変化や温度特
性の変化によってオフセット値がずれて電流の測定精度
が低下してしまう欠点がある。The current sensor for detecting the current of the battery needs to have a complicated circuit configuration using high-precision parts in order to increase the accuracy, and it is necessary to adjust the circuit more precisely. The parts cost and the manufacturing cost are extremely high. Furthermore, immediately after manufacturing, even if the offset value is adjusted so that both the charging current and the discharging current can be accurately detected, the offset value shifts due to aging and changes in temperature characteristics, and the current measurement accuracy is reduced. However, there is a drawback that is reduced.
【０００７】本発明は、このような弊害を解消すること
を目的に開発されたもので、本発明の重要な目的は、主
電流センサーの測定値を正確に補正して、微小電流領域
は言うにおよばず、全ての測定範囲において電流を正確
に検出でき、しかも、長期間にわたって極めて正確に電
流を測定できる電流検出装置とこの装置を備えるバッテ
リー装置を提供することにある。The present invention has been developed with the object of eliminating such adverse effects. An important object of the present invention is to correct the measured value of the main current sensor accurately and to refer to the minute current region. It is another object of the present invention to provide a current detection device capable of accurately detecting a current in the entire measurement range and measuring the current extremely accurately over a long period of time, and a battery device including the current detection device.
【０００８】[0008]
【課題を解決するための手段】本発明の電流検出装置
は、電池に流れる電流を検出する主電流センサー１と、
この主電流センサー１の測定値を補正する補正回路２と
を備える。補正回路２は、電池と直列に接続している電
流検出抵抗３と、この電流検出抵抗３の両端の電圧を増
幅するアンプ４と、アンプ４の出力電圧で主電流センサ
ー１の測定値を補正する演算回路５とを備える。補正回
路２は、アンプ４の出力電圧が設定電圧となる状態にお
いて、アンプ４の出力電圧から電流検出抵抗３に流れる
電流を演算し、演算した電流値を主電流センサー１の検
出電流値に比較して、主電流センサー１の測定値を補正
している。A current detecting device according to the present invention comprises: a main current sensor 1 for detecting a current flowing through a battery;
A correction circuit 2 for correcting the measurement value of the main current sensor 1; The correction circuit 2 corrects the measured value of the main current sensor 1 with the current detection resistor 3 connected in series with the battery, the amplifier 4 for amplifying the voltage across the current detection resistor 3, and the output voltage of the amplifier 4. And an arithmetic circuit 5 for performing the operation. The correction circuit 2 calculates the current flowing through the current detection resistor 3 from the output voltage of the amplifier 4 when the output voltage of the amplifier 4 becomes the set voltage, and compares the calculated current value with the detected current value of the main current sensor 1. Thus, the measurement value of the main current sensor 1 is corrected.
【０００９】主電流センサー１は、クランプ型の電流セ
ンサーとすることができる。さらに、電流検出抵抗３
は、電池を直列に接続しているパスバー３Ａ、電池と直
列に接続しているヒューズ３Ｂ、あるいは、電池間接続
部の抵抗のいずれかとすることができる。さらに、補正
回路２は、好ましくは、測定値を補正する設定電圧を特
定のピンポイントの電圧値とする。The main current sensor 1 can be a clamp-type current sensor. Further, the current detection resistor 3
May be any of a pass bar 3A connecting the batteries in series, a fuse 3B connecting the batteries in series, or a resistance of a connection portion between the batteries. Further, the correction circuit 2 preferably sets the set voltage for correcting the measured value to a specific pinpoint voltage value.
【００１０】本発明の電流検出装置を備えるバッテリー
装置は、請求項１に記載する構成の電流検出装置に加え
て、主電流センサー１で検出される電流から電池の残存
容量を演算する積算回路７を備える。According to the present invention, there is provided a battery device provided with a current detecting device according to the present invention, further comprising an integrating circuit for calculating a remaining capacity of the battery from a current detected by the main current sensor. Is provided.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施例を図面に基
づいて説明する。ただし、以下に示す実施例は、本発明
の技術思想を具体化するための装置を例示するものであ
って、本発明は電流検出装置とバッテリー装置を以下の
ものに特定しない。Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below exemplify a device for embodying the technical idea of the present invention, and the present invention does not specify the current detecting device and the battery device as follows.
【００１２】さらに、この明細書は、特許請求の範囲を
理解しやすいように、実施例に示される部材に対応する
番号を、「特許請求の範囲の欄」、および「課題を解決
するための手段の欄」に示される部材に付記している。
ただ、特許請求の範囲に示される部材を、実施例の部材
に特定するものでは決してない。Further, in this specification, in order to make it easier to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as "claims" and "claims". In the column of “means”.
However, the members described in the claims are not limited to the members of the embodiments.
【００１３】図１は自動車を走行させるバッテリー装置
の回路図を示している。この図のバッテリー装置は、電
池の充放電電流を検出する電流検出装置と、電流検出装
置の出力信号で電池の残存容量を演算する積算回路７
と、積算回路７で演算された残存容量でもってモーター
や発電機（図示せず）を制御する制御回路８を備えてい
る。FIG. 1 is a circuit diagram of a battery device for driving an automobile. The battery device shown in the figure includes a current detection device for detecting a charge / discharge current of a battery, and an integrating circuit 7 for calculating a remaining capacity of the battery based on an output signal of the current detection device.
And a control circuit 8 for controlling a motor and a generator (not shown) with the remaining capacity calculated by the integrating circuit 7.
【００１４】電流検出装置は、電池に流れる電流を検出
する主電流センサー１と、この主電流センサー１の測定
値を補正する補正回路２とを備える。主電流センサー１
は、電池に流れる充放電電流を全ての範囲で検出できる
もので、たとえば、最大測定電流を１００Ａ〜３００Ａ
とするものである。主電流センサー１は、電線に流れる
電流によって発生する磁束から電流を検出するクランプ
型の電流センサーである。クランプ型の電流センサー
は、電流で発生する磁束をセンサー部で電圧に変換し、
変換した電圧をアンプで増幅して出力し、あるいはアン
プの出力信号をＡ／Ｄコンバータでデジタル値に変換し
て出力する。主電流センサーには、クランプ型以外のタ
イプの電流センサーも使用できる。The current detecting device includes a main current sensor 1 for detecting a current flowing through the battery, and a correction circuit 2 for correcting a measured value of the main current sensor 1. Main current sensor 1
Can detect the charge / discharge current flowing through the battery in all ranges. For example, the maximum measured current is 100 A to 300 A.
It is assumed that. The main current sensor 1 is a clamp-type current sensor that detects a current from a magnetic flux generated by a current flowing through an electric wire. The clamp type current sensor converts the magnetic flux generated by the current into voltage in the sensor part,
The converted voltage is amplified by an amplifier and output, or the output signal of the amplifier is converted into a digital value by an A / D converter and output. Other types of current sensors than the clamp type can be used as the main current sensor.
【００１５】主電流センサー１のオフセット値を補正し
て、検出した電流の測定をするのが補正回路２である。
図の補正回路２は、電池と直列に接続している電流検出
抵抗３と、この電流検出抵抗３の両端の電圧を増幅する
アンプ４と、アンプ４の出力電圧で主電流センサー１の
オフセット値を演算する演算回路５とを備える。The correction circuit 2 corrects the offset value of the main current sensor 1 and measures the detected current.
The correction circuit 2 shown in the figure includes a current detection resistor 3 connected in series with a battery, an amplifier 4 for amplifying the voltage across the current detection resistor 3, and an offset value of the main current sensor 1 based on the output voltage of the amplifier 4. And an operation circuit 5 for calculating
【００１６】電流検出抵抗３は、電池を直列に接続する
ためのパスバー３Ａ、あるいは、図２に示すように、電
池と直列に接続しているヒューズ３Ｂ、あるいはまた、
図示しないが、電池間接続部の抵抗のいずれかである。
自動車のバッテリーは、複数本のモジュール電池６をパ
スバー３Ａで直列に接続している。モジュール電池６
は、複数の二次電池を、皿状接続体等の電池間接続部で
直列に接続したものである。以上のように電流検出抵抗
３を、パスバー３Ａやヒューズ３Ｂあるいは電池接続部
の抵抗のいずれかを併用する回路は、電池と直列に電流
を検出するために余分な抵抗を接続する必要がなく、電
流検出抵抗３によるロスを少なくできる特長がある。The current detecting resistor 3 includes a pass bar 3A for connecting batteries in series, or a fuse 3B connected in series to batteries as shown in FIG.
Although not shown, it is one of the resistances of the connection part between the batteries.
The automobile battery has a plurality of module batteries 6 connected in series by a pass bar 3A. Module battery 6
Is a device in which a plurality of secondary batteries are connected in series at an inter-battery connection portion such as a dish-shaped connection body. As described above, the circuit in which the current detection resistor 3 is used in combination with any of the pass bar 3A, the fuse 3B, and the resistor of the battery connection portion does not need to connect an extra resistor to detect the current in series with the battery. There is a feature that the loss due to the current detection resistor 3 can be reduced.
【００１７】アンプ４は電流検出抵抗３の両端に発生す
る電圧を増幅する。電流検出抵抗３の電気抵抗は極めて
小さいので、両端に発生する電圧は小さい。電流検出抵
抗３の両端に発生する電圧が、電気抵抗と電流の積に比
例するからである。アンプ４は、電流検出抵抗３に発生
する微小電圧を増幅して演算回路５に入力する。たとえ
ば、電流検出抵抗３の電気抵抗を５ｍΩ、主電流センサ
ー１の測定値を補正するためのオフセット値を検出する
電流を１Ａとするとき、たとえば、アンプ４の増幅率を
１０００倍とする。このアンプ４は、１Ａの電流が流れ
る状態で、電流検出抵抗３の両端に発生する電圧を５Ｖ
に増幅して演算回路５に入力する。主電流センサー１の
測定値を、特定のピンポイントで補正する補正回路２
は、アンプ４の直線性を問わず正確にオフセット値を測
定できる。この補正回路２は、図３に示すように、増幅
特性の直線性が悪いアンプを使用して正確にオフセット
値を演算できる。このアンプ４は、オフセット値を測定
する特定のピンポイントでのみ、電流検出抵抗３の電圧
を正確な増幅率で増幅すればよい。たとえば、ピンポイ
ントでのみ増幅率を正確に特定された１０００倍とすれ
ばよく、入力電圧が５ｍＶのときに、正確に１０００倍
に増幅すればよい。この種のアンプ４は極めて安価に製
作できる。入力範囲を広い範囲で増幅する必要がなく、
また、測定できる領域においても、直線性が要求されな
いからである。The amplifier 4 amplifies the voltage generated across the current detection resistor 3. Since the electric resistance of the current detection resistor 3 is extremely small, the voltage generated at both ends is small. This is because the voltage generated at both ends of the current detection resistor 3 is proportional to the product of the electric resistance and the current. The amplifier 4 amplifies a minute voltage generated in the current detection resistor 3 and inputs the amplified voltage to the arithmetic circuit 5. For example, when the electric resistance of the current detection resistor 3 is 5 mΩ and the current for detecting the offset value for correcting the measurement value of the main current sensor 1 is 1 A, for example, the amplification factor of the amplifier 4 is 1000 times. This amplifier 4 applies a voltage of 5 V to both ends of the current detection resistor 3 when a current of 1 A flows.
And input to the arithmetic circuit 5. Correction circuit 2 for correcting the measurement value of main current sensor 1 at a specific pinpoint
Can accurately measure the offset value regardless of the linearity of the amplifier 4. As shown in FIG. 3, the correction circuit 2 can accurately calculate an offset value using an amplifier having poor linearity in amplification characteristics. The amplifier 4 need only amplify the voltage of the current detection resistor 3 at an accurate amplification factor only at a specific pinpoint for measuring the offset value. For example, the amplification factor may be exactly 1000 times, which is exactly specified only at the pinpoint, and may be exactly 1000 times when the input voltage is 5 mV. This type of amplifier 4 can be manufactured at very low cost. There is no need to amplify the input range over a wide range,
Also, linearity is not required even in a region where measurement is possible.
【００１８】ただ、本発明の装置は、ピンポイントのみ
でなく、所定の電流領域で電流検出抵抗３の電圧を検出
して、主電流センサー１のオフセット値を測定し、ある
いは、電流値が異なる複数点で電流検出抵抗３の電圧を
検出してオフセット値を測定することもできるのは言う
までもない。ただ、補正回路２は、主電流センサー１の
０点付近における測定値をより正確に補正することが大
切であるから、補正回路２がオフセット値を測定する電
流は、好ましくは、主電流センサー１のフルスケールの
１／１０以下、より好ましくは１／５０、さらに好まし
くは１／１００とするのがよい。However, the device of the present invention detects not only the pinpoint but also the voltage of the current detecting resistor 3 in a predetermined current region to measure the offset value of the main current sensor 1, or the current value is different. Needless to say, the offset value can be measured by detecting the voltage of the current detection resistor 3 at a plurality of points. However, since it is important that the correction circuit 2 corrects the measurement value near the zero point of the main current sensor 1 more accurately, the current for which the correction circuit 2 measures the offset value is preferably the main current sensor 1. Is preferably 1/10 or less, more preferably 1/50, even more preferably 1/100 of the full scale.
【００１９】電流検出抵抗３の電気抵抗を５ｍΩとし、
アンプ４の増幅率を１０００倍とする補正回路２は、ア
ンプ４の出力電圧が５Ｖのときに電流検出抵抗３に流れ
る電流が正確に１Ａとなる。いいかえると、この補正回
路２は、アンプ４の出力電圧である５Ｖを検出して電流
検出抵抗３に流れる電流を１Ａとする。The electric resistance of the current detecting resistor 3 is 5 mΩ,
In the correction circuit 2 in which the amplification factor of the amplifier 4 is 1000 times, the current flowing through the current detection resistor 3 when the output voltage of the amplifier 4 is 5 V is exactly 1A. In other words, the correction circuit 2 detects the output voltage of the amplifier 4 of 5 V and sets the current flowing through the current detection resistor 3 to 1 A.
【００２０】この補正回路２が主電流センサー１の測定
値を補正する状態を図４に示す。この図の主電流センサ
ー１は、０点がずれて小電流における測定値がずれてい
る。たとえば、補正回路２が電流検出抵抗３の電流を正
確に１Ａと検出するときに、正確な主電流センサー１は
測定値が１Ａとなる。しかしながら、図の実線で示す主
電流センサー１は、補正回路２が１Ａを検出するとき
に、測定値がＡ点にずれている。このため、Ａ点の測定
値を１Ａに補正する値がオフセット値であるから、オフ
セット値は（Ａ−１）となる。すなわち、図の矢印で示
すように、主電流センサー１の測定値をオフセット値に
相当する（Ａ−１）だけ平行にずらせると、主電流セン
サー１の測定値を電流値に補正できる。FIG. 4 shows a state in which the correction circuit 2 corrects the measured value of the main current sensor 1. In the main current sensor 1 in this figure, the measured value at a small current is shifted by a zero point. For example, when the correction circuit 2 accurately detects the current of the current detection resistor 3 as 1A, the accurate main current sensor 1 measures 1A. However, in the main current sensor 1 shown by the solid line in the figure, when the correction circuit 2 detects 1A, the measured value is shifted to the point A. Therefore, the offset value is (A-1) because the value that corrects the measured value at point A to 1A is the offset value. That is, as shown by the arrow in the figure, when the measured value of the main current sensor 1 is shifted in parallel by (A-1) corresponding to the offset value, the measured value of the main current sensor 1 can be corrected to the current value.
【００２１】すなわち、補正回路２は、アンプ４の出力
電圧が設定電圧である５Ｖになる状態において、アンプ
４の出力電圧から電流検出抵抗３に流れる正しい電流を
測定し、正確な電流値を主電流センサー１の測定値に比
較して、主電流センサー１の測定値を補正するオフセッ
ト値を測定し、このオフセット値でもって、主電流セン
サー１の測定値を常に補正して正確な電流を測定する。
オフセット値は特定の電流で測定するが、測定されたオ
フセット値は、主電流センサー１が検出する全ての測定
値を補正する。したがって、補正回路２を特定の電流で
検出して、主電流センサー１が検出する全ての電流値を
正確に補正できる。That is, when the output voltage of the amplifier 4 reaches the set voltage of 5 V, the correction circuit 2 measures a correct current flowing from the output voltage of the amplifier 4 to the current detecting resistor 3 and calculates an accurate current value. An offset value for correcting the measured value of the main current sensor 1 is measured in comparison with the measured value of the current sensor 1, and the measured current value of the main current sensor 1 is constantly corrected with the offset value to measure an accurate current. I do.
The offset value is measured at a specific current, and the measured offset value corrects all the measured values detected by the main current sensor 1. Therefore, the correction circuit 2 can be detected with a specific current, and all the current values detected by the main current sensor 1 can be accurately corrected.
【００２２】[0022]
【発明の効果】本発明の電流検出装置は、主電流センサ
ーの測定値を正確に補正して、微小電流領域は言うにお
よばず、全ての測定範囲において電流を正確に検出でき
る特長がある。それは、本発明の電流検出装置が、電池
と直列に接続している電流検出抵抗と、この電流検出抵
抗の両端の電圧を増幅するアンプと、アンプの出力電圧
で主電流センサーの測定値を補正する演算回路とを備え
る補正回路備え、この補正回路で主電流センサーの測定
値を補正しているからである。この補正回路は、設定電
圧におけるアンプの出力電圧から電流検出抵抗に流れる
正しい電流を演算し、演算した電流値を主電流センサー
の電流値に比較して、主電流センサーの測定値を補正す
るので、極めて簡単な構造として、主電流センサーが検
出する測定値を常に正確に補正できる。さらに、演算さ
れた電流値で主電流センサーが検出する全ての測定値を
正確に補正できるので、微小電流領域だけでなく、全て
の測定範囲における電流を正確に検出できる。The current detecting device according to the present invention has a feature that the measured value of the main current sensor can be accurately corrected, and the current can be accurately detected in the entire measuring range as well as the minute current region. That is, the current detection device of the present invention corrects the measurement value of the main current sensor with the current detection resistor connected in series with the battery, the amplifier that amplifies the voltage across the current detection resistor, and the output voltage of the amplifier. This is because a correction circuit including an arithmetic circuit for performing the correction is provided, and the correction value corrects the measurement value of the main current sensor. This correction circuit calculates the correct current flowing through the current detection resistor from the output voltage of the amplifier at the set voltage, compares the calculated current value with the current value of the main current sensor, and corrects the measurement value of the main current sensor. With a very simple structure, the measurement value detected by the main current sensor can always be accurately corrected. Furthermore, since all the measurement values detected by the main current sensor can be accurately corrected with the calculated current value, the current can be accurately detected not only in the minute current region but also in the entire measurement range.
【００２３】さらに、本発明の電流検出装置は、設定電
圧におけるアンプの出力電圧から電流検出抵抗に流れる
正しい電流値を演算し、この電流値に基づいて常に主電
流センサーの電流値を補正するので、経年変化や温度特
性の変化によってオフセット値がずれることなく、長期
間にわたって極めて正確な測定精度で電流を測定できる
特長もある。Furthermore, the current detection device of the present invention calculates the correct current value flowing through the current detection resistor from the output voltage of the amplifier at the set voltage, and always corrects the current value of the main current sensor based on this current value. Another feature is that the current can be measured with extremely accurate measurement accuracy over a long period of time without the offset value shifting due to aging or changes in temperature characteristics.
【００２４】さらに、本発明の電流検出装置を備えるバ
ッテリー装置は、電流検出装置で常に正確な電流値が測
定できるので、積算回路で積算される残存容量の誤差を
低減して、残存容量をより正確に演算できる特長があ
る。Further, in the battery device provided with the current detecting device of the present invention, an accurate current value can always be measured by the current detecting device. Therefore, the error of the remaining capacity integrated by the integrating circuit can be reduced, and the remaining capacity can be further improved. There is a feature that can be calculated accurately.
【図１】本発明の実施例の電流検出装置を備えるバッテ
リー装置を示す回路図FIG. 1 is a circuit diagram showing a battery device including a current detection device according to an embodiment of the present invention.
【図２】本発明の他の実施例の電流検出装置を備えるバ
ッテリー装置を示す回路図FIG. 2 is a circuit diagram showing a battery device including a current detection device according to another embodiment of the present invention.
【図３】アンプの増幅特性の一例を示すグラフFIG. 3 is a graph showing an example of an amplification characteristic of an amplifier.
【図４】補正回路が主電流センサーの測定値を補正する
状態を示す図FIG. 4 is a diagram showing a state where a correction circuit corrects a measurement value of a main current sensor.
１…主電流センサー ２…補正回路 ３…電流検出抵抗 ３Ａ…パスバー ３
Ｂ…ヒューズ ４…アンプ ５…演算回路 ６…モジュール電池 ７…積算回路 ８…制御回路DESCRIPTION OF SYMBOLS 1 ... Main current sensor 2 ... Correction circuit 3 ... Current detection resistance 3A ... Pass bar 3
B ... Fuse 4 ... Amplifier 5 ... Operation circuit 6 ... Module battery 7 ... Integration circuit 8 ... Control circuit
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） // Ｂ６０Ｌ 11/18 Ｂ６０Ｌ 11/18 Ａ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) // B60L 11/18 B60L 11/18 A
Claims (8)
サー(1)と、この主電流センサー(1)の測定値を補正する
補正回路(2)とを備え、 補正回路(2)が、電池と直列に接続している電流検出抵
抗(3)と、この電流検出抵抗(3)の両端の電圧を増幅する
アンプ(4)と、アンプ(4)の出力電圧で主電流センサー
(1)の測定値を補正する演算回路(5)とを備え、 アンプ(4)の出力電圧が設定電圧となる状態において、
補正回路(2)がアンプ(4)の出力電圧から電流検出抵抗
(3)に流れる電流を演算し、演算した電流値を主電流セ
ンサー(1)の検出電流値に比較して、主電流センサー(1)
の測定値を補正する電流検出装置。1. A main current sensor (1) for detecting a current flowing through a battery, and a correction circuit (2) for correcting a measurement value of the main current sensor (1), wherein the correction circuit (2) A current detection resistor (3) connected in series with the amplifier, an amplifier (4) that amplifies the voltage between both ends of the current detection resistor (3), and a main current sensor using the output voltage of the amplifier (4)
An arithmetic circuit (5) for correcting the measurement value of (1) is provided, and in a state where the output voltage of the amplifier (4) becomes the set voltage,
The correction circuit (2) detects the current detection resistance from the output voltage of the amplifier (4).
Calculate the current flowing through (3), compare the calculated current value with the detected current value of the main current sensor (1), and
A current detection device that corrects the measured value.
センサーである請求項１に記載の電流検出装置。2. The current detecting device according to claim 1, wherein the main current sensor is a clamp-type current sensor.
しているパスバー(3A)、電池と直列に接続しているヒュ
ーズ(3B)、電池間接続部の抵抗のいずれかである請求項
１に記載の電流検出装置。3. The current detection resistor (3) is one of a pass bar (3A) connecting the batteries in series, a fuse (3B) connecting the batteries in series, and a resistor at a connection portion between the batteries. The current detection device according to claim 1.
圧が特定のピンポイントの電圧値である請求項１に記載
の電流検出装置。4. The current detection device according to claim 1, wherein the set voltage at which the correction circuit corrects the measured value is a specific pinpoint voltage value.
サー(1)と、この主電流センサー(1)の測定値を補正する
補正回路(2)と、主電流センサー(1)で検出される電流か
ら電池の残存容量を演算する積算回路(7)とを備え、 補正回路(2)が、電池と直列に接続している電流検出抵
抗(3)と、この電流検出抵抗(3)の両端の電圧を増幅する
アンプ(4)と、アンプ(4)の出力電圧で主電流センサー
(1)の測定値を補正する演算回路(5)とを備え、 アンプ(4)の出力電圧が設定電圧となる状態において、
補正回路(2)がアンプ(4)の出力電圧から電流検出抵抗
(3)に流れる電流を演算し、演算した電流値を主電流セ
ンサー(1)の検出電流値に比較して、主電流センサー(1)
の測定値を補正する電流検出装置を備えるバッテリー装
置。5. A main current sensor (1) for detecting a current flowing through a battery, a correction circuit (2) for correcting a measured value of the main current sensor (1), and a main current sensor (1). A correction circuit (2) for calculating the remaining capacity of the battery from the current, wherein the correction circuit (2) includes a current detection resistor (3) connected in series with the battery, and both ends of the current detection resistor (3). Amplifier (4) that amplifies the voltage of the amplifier and the main current sensor with the output voltage of the amplifier (4)
An arithmetic circuit (5) for correcting the measurement value of (1) is provided, and in a state where the output voltage of the amplifier (4) becomes the set voltage,
The correction circuit (2) detects the current detection resistance from the output voltage of the amplifier (4).
Calculate the current flowing through (3), compare the calculated current value with the detected current value of the main current sensor (1), and
A battery device including a current detection device that corrects a measured value of the battery.
センサーである請求項５に記載の電流検出装置を備える
バッテリー装置。6. The battery device according to claim 5, wherein the main current sensor is a clamp-type current sensor.
しているパスバー(3A)、電池と直列に接続しているヒュ
ーズ(3B)、電池間接続部の抵抗のいずれかである請求項
５に記載の電流検出装置を備えるバッテリー装置。7. The current detection resistor (3) is one of a pass bar (3A) connecting the batteries in series, a fuse (3B) connecting the batteries in series, and a resistor at a connection portion between the batteries. A battery device comprising the current detection device according to claim 5.
圧が特定のピンポイントの電圧値である請求項５に記載
の電流検出装置を備えるバッテリー装置。8. A battery device comprising the current detection device according to claim 5, wherein the set voltage at which the correction circuit corrects the measured value is a specific pinpoint voltage value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000234691A JP3691364B2 (en) | 2000-08-02 | 2000-08-02 | Current detection device and battery device including current detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000234691A JP3691364B2 (en) | 2000-08-02 | 2000-08-02 | Current detection device and battery device including current detection device |
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| Publication Number | Publication Date |
|---|---|
| JP2002050406A true JP2002050406A (en) | 2002-02-15 |
| JP3691364B2 JP3691364B2 (en) | 2005-09-07 |
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| JP2000234691A Expired - Fee Related JP3691364B2 (en) | 2000-08-02 | 2000-08-02 | Current detection device and battery device including current detection device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008076339A (en) * | 2006-09-25 | 2008-04-03 | Sanyo Electric Co Ltd | Power supply of for vehicle |
| JP2010122194A (en) * | 2008-11-21 | 2010-06-03 | Sanyo Electric Co Ltd | Battery system |
| JP2015069964A (en) * | 2013-10-01 | 2015-04-13 | 株式会社Ｇｓユアサ | Abnormality determination device |
| KR20170007131A (en) * | 2015-07-10 | 2017-01-18 | 도요타 지도샤（주） | Control system for battery |
| JP2019191006A (en) * | 2018-04-25 | 2019-10-31 | 三洋電機株式会社 | Current detection system and power storage system |
| CN111044910A (en) * | 2018-10-12 | 2020-04-21 | 大陆汽车有限责任公司 | Method for operating a battery sensor and battery sensor |
| WO2023003242A1 (en) * | 2021-07-19 | 2023-01-26 | 효성중공업 주식회사 | Battery fire prevention and diagnosis system |
| CN117747990A (en) * | 2024-02-15 | 2024-03-22 | 昆明市官渡区职业高级中学 | New energy automobile power battery maintenance detection system and method |
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2000
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008076339A (en) * | 2006-09-25 | 2008-04-03 | Sanyo Electric Co Ltd | Power supply of for vehicle |
| JP2010122194A (en) * | 2008-11-21 | 2010-06-03 | Sanyo Electric Co Ltd | Battery system |
| JP2015069964A (en) * | 2013-10-01 | 2015-04-13 | 株式会社Ｇｓユアサ | Abnormality determination device |
| KR20170007131A (en) * | 2015-07-10 | 2017-01-18 | 도요타 지도샤（주） | Control system for battery |
| KR101888974B1 (en) | 2015-07-10 | 2018-08-16 | 도요타 지도샤（주） | Control system for battery |
| JP7097741B2 (en) | 2018-04-25 | 2022-07-08 | 三洋電機株式会社 | Current detection system, power storage system |
| JP2019191006A (en) * | 2018-04-25 | 2019-10-31 | 三洋電機株式会社 | Current detection system and power storage system |
| CN111044910A (en) * | 2018-10-12 | 2020-04-21 | 大陆汽车有限责任公司 | Method for operating a battery sensor and battery sensor |
| CN111044910B (en) * | 2018-10-12 | 2023-04-18 | 大陆汽车科技有限公司 | Method for operating a battery sensor and battery sensor |
| US11656284B2 (en) | 2018-10-12 | 2023-05-23 | Continental Automotive Gmbh | Method for operating a battery sensor, and battery sensor |
| WO2023003242A1 (en) * | 2021-07-19 | 2023-01-26 | 효성중공업 주식회사 | Battery fire prevention and diagnosis system |
| CN117747990A (en) * | 2024-02-15 | 2024-03-22 | 昆明市官渡区职业高级中学 | New energy automobile power battery maintenance detection system and method |
| CN117747990B (en) * | 2024-02-15 | 2024-04-23 | 昆明市官渡区职业高级中学 | New energy automobile power battery maintenance detection system and method |
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