JPH03108679A - Discharge capacity control circuit - Google Patents
Discharge capacity control circuitInfo
- Publication number
- JPH03108679A JPH03108679A JP1247058A JP24705889A JPH03108679A JP H03108679 A JPH03108679 A JP H03108679A JP 1247058 A JP1247058 A JP 1247058A JP 24705889 A JP24705889 A JP 24705889A JP H03108679 A JPH03108679 A JP H03108679A
- Authority
- JP
- Japan
- Prior art keywords
- secondary battery
- voltage
- current
- reference level
- remaining power
- 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.)
- Pending
Links
- 238000007599 discharging Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method 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
Landscapes
- Tests Of Electric Status Of Batteries (AREA)
- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は二次電池の過放電を防止するための放電容量制
御回路に関するもので、特に、二次電池の内部抵抗の影
響を考慮した放電容量制御回路に関する。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a discharge capacity control circuit for preventing overdischarge of a secondary battery, and in particular to a discharge capacity control circuit for preventing overdischarge of a secondary battery. This invention relates to a discharge capacity control circuit that takes into account the influence.
（従来の技術）
二次電池の端子間電圧は、二次電池に蓄えられた電力が
少なくなるに連れて徐々に低下する特性を示す。そこで
、従来より二次電池の端子間の電圧を検出し、二次電池
に蓄えられた電力の残りを判定する装置が知られている
。(Prior Art) The voltage between the terminals of a secondary battery exhibits a characteristic that it gradually decreases as the electric power stored in the secondary battery decreases. Therefore, devices are conventionally known that detect the voltage between the terminals of a secondary battery and determine the remaining power stored in the secondary battery.
このような装置は、例えば特開昭６３−１９０５２６号
公報などに提案されている。Such a device has been proposed, for example, in Japanese Patent Laid-Open No. 190526/1983.
（発明が解決しようとする問題点）
ところが、二次電池はいわゆる内部抵抗を有しているた
め、二次電池から流れ出る電流が大きくなった場合、二
次電池の端子電圧は二次電池に蓄えられた電力の残りと
は無関係に低下してしまう。(Problem to be solved by the invention) However, since secondary batteries have so-called internal resistance, when the current flowing out of the secondary battery becomes large, the terminal voltage of the secondary battery is stored in the secondary battery. This decreases regardless of the amount of power remaining.
このため、従来装置においては、二次電池から流出する
電流が大きくなった際には、二次電池に蓄えられた電力
の残りが少なめに判定されてしまう問題点があった。Therefore, in the conventional device, when the current flowing out from the secondary battery becomes large, there is a problem in that the remaining power stored in the secondary battery is determined to be too small.
本発明は、このような従来装置の問題点を解決するため
になされたもので、二次電池から流出する電流の大小と
は無関係に、二次電池に蓄えられた電力の残りを正しく
判断できるようにすることを技術的課題とする。The present invention was made to solve these problems with conventional devices, and it is possible to correctly determine the remaining power stored in the secondary battery, regardless of the magnitude of the current flowing out from the secondary battery. The technical challenge is to do so.
（課題を解決するための手段）
前述した技術的課題を達成するために講じた技術的手段
は、二次電池の端子間電圧に基づいて二次電池に蓄えら
れた電力の残りを判断する残電力判定手段を備えた放電
容量制御回路において、二次電池に電流センサを接続し
、残電力判定手段が電力の残りが少ないと判断する際の
基準レベルを電流センサが検出した電流の大きさに応じ
て設定するようにしたことである。(Means for solving the problem) The technical means taken to achieve the above-mentioned technical problem is a residual battery that determines the remaining power stored in the secondary battery based on the voltage across the terminals of the secondary battery. In a discharge capacity control circuit equipped with a power determination means, a current sensor is connected to the secondary battery, and the reference level at which the remaining power determination means determines that there is little remaining power is determined by the magnitude of the current detected by the current sensor. This is done so that settings can be made accordingly.
（作用）
前述した技術的手段によれば、電流センサが検出した電
流の大きさにより、残電力判定手段が電力の残りが少な
いと判断する際の基準レベルが変更される。従って、二
次電池から流出する電流の大小とは無関係に、二次電池
に蓄えられた電力の残りを正しく判断することができ、
所期の技術的課題が達成される。(Function) According to the above-mentioned technical means, the reference level at which the remaining power determining means determines that there is little remaining power is changed depending on the magnitude of the current detected by the current sensor. Therefore, regardless of the magnitude of the current flowing out from the secondary battery, it is possible to correctly determine the remaining power stored in the secondary battery.
The desired technical task is achieved.
（実施例）
以下、添付図面を参照して、本発明の好ましい一実施例
について説明する。(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
図は本発明を適用した放電容量制御回路の回路図である
。二次電池１１にはリレー１２を介して負荷１４が接続
されており、リレー１２の接点１２１が閉じている間、
二次電池１１から負荷１４に電力が供給される。The figure is a circuit diagram of a discharge capacity control circuit to which the present invention is applied. A load 14 is connected to the secondary battery 11 via a relay 12, and while the contact 121 of the relay 12 is closed,
Power is supplied from the secondary battery 11 to the load 14 .
また、二次電池１１にはリレー１２を介して定電圧回路
３４が接続されている。定電圧回路３４はボルテージフ
ォロワ１７．２０、差動増幅器２３、比較回路２９に一
定電圧の電力を供給する。Further, a constant voltage circuit 34 is connected to the secondary battery 11 via a relay 12. The constant voltage circuit 34 supplies constant voltage power to the voltage follower 17, 20, the differential amplifier 23, and the comparator circuit 29.
リレー１２から出力された二次電池１１の出力電圧は電
圧調整回路３０に入力される。電圧調整回路３Ｇは二次
電池１１の出力電圧を分圧し、二次電池１１の出力電圧
よりも低い電圧を出力する。The output voltage of the secondary battery 11 output from the relay 12 is input to the voltage adjustment circuit 30. The voltage adjustment circuit 3G divides the output voltage of the secondary battery 11 and outputs a voltage lower than the output voltage of the secondary battery 11.
電圧調整回路３０の出力電圧は二次電池１１の出力電圧
に比例して増減する。The output voltage of the voltage adjustment circuit 30 increases or decreases in proportion to the output voltage of the secondary battery 11.
電圧調整回路３０は最終放電電圧設定用の可変抵抗器３
０１を備えている。可変抵抗器３０１は二次電池１１の
特性に従って、電圧調整回路３０から適当な電圧が出力
されるように調節される。The voltage adjustment circuit 30 includes a variable resistor 3 for setting the final discharge voltage.
01. The variable resistor 301 is adjusted according to the characteristics of the secondary battery 11 so that the voltage adjustment circuit 30 outputs an appropriate voltage.
電圧調整回路３Ｇの出力電圧は、抵抗３１を通して比較
回路２９の非反転入力端子に入力されている。比較回路
２９は、反転入力端子に入力された加減算回路２７の出
力電圧を基準レベルとして動作する。抵抗２８，３１．
３４および比較回路質９は二次電池１１に蓄えられた電
力の残りを判定する残電力判定手段３２を構成する。The output voltage of the voltage adjustment circuit 3G is input to the non-inverting input terminal of the comparator circuit 29 through the resistor 31. The comparison circuit 29 operates using the output voltage of the addition/subtraction circuit 27 inputted to the inverting input terminal as a reference level. Resistors 28, 31.
34 and the comparison circuit 9 constitute a remaining power determining means 32 for determining the remaining power stored in the secondary battery 11.
残電力判定手段３２は、電圧調整回路３０の出力電圧が
加減算回路２７の出力電圧よりも高い時、即ち、二次電
池１１の出力電圧が十分に高く、二次電池１１内に蓄え
られた電力の残りが多いと推定される時には、リレード
ライブ回路３３を動作させ、リレー１２の接点１２１を
閉じる。逆に、残電力判定手段３２は、電圧調整回路３
０の出力電圧が加減算回路２７の出力電圧よりも低い時
、即ち、二次電池１１の出力電圧が低く、二次電池１１
内に蓄えられた電力の残りが少ないと推定される時には
、リレードライブ回路３３を動作させ、リレー１２の接
点１２１を開く。The remaining power determining means 32 detects the power stored in the secondary battery 11 when the output voltage of the voltage adjustment circuit 30 is higher than the output voltage of the addition/subtraction circuit 27, that is, when the output voltage of the secondary battery 11 is sufficiently high. When it is estimated that there is much remaining, the relay drive circuit 33 is operated and the contact 121 of the relay 12 is closed. Conversely, the remaining power determining means 32
When the output voltage of 0 is lower than the output voltage of the addition/subtraction circuit 27, that is, the output voltage of the secondary battery 11 is low,
When it is estimated that there is little remaining power stored in the relay, the relay drive circuit 33 is operated and the contact 121 of the relay 12 is opened.
このように、残電力判定手段３２は、二次電池１１の出
力電圧に基づいて二次電池１１に蓄えられた電力の残り
を推定し、二次電池１１に蓄えられた電力の残りが少な
いと判定される時には、リレー１２の接点１２１を開い
て、二次電池１１の過放電を防止する。In this way, the remaining power determination means 32 estimates the remaining power stored in the secondary battery 11 based on the output voltage of the secondary battery 11, and determines if the remaining power stored in the secondary battery 11 is low. When it is determined, the contact 121 of the relay 12 is opened to prevent over-discharge of the secondary battery 11.
ところで、負荷１４に大電流が流れている間は、二次電
池１１の内部抵抗により大きな電圧降下が発生し、二次
電池１１の出力電圧が低くなる。逆に、負荷１４に流れ
る電流が小さくなると、二次電池１１の内部抵抗による
電圧降下が減少して二次電池１１の出力電圧が高くなる
。従って、二次電池１１の出力電圧だけに基づいて二次
電池１１に蓄えられた電力の残りを推定していると、二
次電池１１に十分な電力が残されているのにリレー１２
の接点１２１が開いてしまったり、逆に二次電池１１に
残された電力が少ないのにリレー１２の接点１２１が閉
じたままになったりする。By the way, while a large current is flowing through the load 14, a large voltage drop occurs due to the internal resistance of the secondary battery 11, and the output voltage of the secondary battery 11 becomes low. Conversely, when the current flowing through the load 14 decreases, the voltage drop due to the internal resistance of the secondary battery 11 decreases, and the output voltage of the secondary battery 11 increases. Therefore, if the remaining power stored in the secondary battery 11 is estimated based only on the output voltage of the secondary battery 11, even though sufficient power remains in the secondary battery 11, the relay 12
The contact 121 of the relay 12 may open, or the contact 121 of the relay 12 may remain closed even though there is little power left in the secondary battery 11.
そこで、本実施例装置では、負荷１４に流れる電流の大
きさに応じて、加減算回路２７の出力電圧（即ち、残電
力判定手段３２０基準レベル）を変化させ、二次電池１
１の内部抵抗の影響を補償している。Therefore, in the device of this embodiment, the output voltage of the addition/subtraction circuit 27 (i.e., the reference level of the remaining power determination means 320) is changed according to the magnitude of the current flowing through the load 14, and the output voltage of the secondary battery 14 is changed.
This compensates for the influence of the internal resistance of 1.
負荷１４に流れる電流は、抵抗１３の両端に電圧降下を
発生させる。この時、抵抗１３の両端に発生する電圧降
下は、負荷１３に流れる電流にほぼ比例する。抵抗１３
の電圧降下により抵抗１３の両端には異なる電圧が発生
する。The current flowing through the load 14 causes a voltage drop across the resistor 13. At this time, the voltage drop generated across the resistor 13 is approximately proportional to the current flowing through the load 13. resistance 13
Different voltages are generated across the resistor 13 due to the voltage drop.
抵抗１３の一端に発生する電圧は、抵抗１５゜１６によ
って分圧され、ボルテージフォロワ１７に入力される。The voltage generated at one end of the resistor 13 is divided by the resistors 15 and 16 and input to the voltage follower 17.
また、抵抗１３の他端に発生する電圧は、抵抗１８．１
９によって分圧され、ボルテージフォロワ２０に入力さ
れる。Further, the voltage generated at the other end of the resistor 13 is the voltage generated at the other end of the resistor 18.1.
9 and input to the voltage follower 20.
ボルテージフォロワ１７．２０から出力された電圧は、
抵抗２１．２２を通って差動増幅器２３に入力される。The voltage output from voltage follower 17.20 is
It is input to the differential amplifier 23 through resistors 21 and 22.
差動増幅器２３の非反転入力端子には抵抗２４を介して
定電圧回路２６が接続されている。A constant voltage circuit 26 is connected to a non-inverting input terminal of the differential amplifier 23 via a resistor 24.
抵抗２１．２２，２４．２５および差動増幅器２３は加
減算回路２７を構成している。従って、差動増幅器２３
から出方される基準レベルＶ。ｕｌは、
Ｖ ｏ ｕ ｔ ＝（Ｘ （Ｖ ｉ ｒ 十Ｖ ｉ ｚ
） ＋ Ｖ ｉ ３で定義される。ただし、αは加減
算回路２７の増幅率、Ｖ ｉ ｌはボルテージフォロワ
１７の出方’ｉＨ］Ｅ、Ｖ ＋ ２はボルテージフォロ
ワ２０の出力電圧、■、３は定電圧回路２６の出力電圧
である。Resistors 21, 22, 24, 25 and differential amplifier 23 constitute an adder/subtractor circuit 27. Therefore, the differential amplifier 23
The reference level V derived from ul is V out = (X (V i r + V i z
) + V i 3. However, α is the amplification factor of the addition/subtraction circuit 27, V i l is the output voltage of the voltage follower 17 'iH]E, V + 2 is the output voltage of the voltage follower 20, and 3 is the output voltage of the constant voltage circuit 26. .
従って、負荷１４に大電流が流れ、抵抗１３の両端に大
きな電圧降下が発生した場合には、電圧Ｖ ｇ Ｉと電
圧Ｖ ｒ ２の差が大きくなり、加減算回路２７から出
力される基準レベルが低下する。逆に、負荷１４に流れ
る電流が減少し、抵抗１３の両端の電圧降下が小さくな
った場合には、電圧ｖ、１と電圧Ｖ、の差が大きくなり
、基準レベルが上昇する。Therefore, when a large current flows through the load 14 and a large voltage drop occurs across the resistor 13, the difference between the voltage V g I and the voltage V r 2 becomes large, and the reference level output from the adder/subtractor circuit 27 becomes descend. Conversely, when the current flowing through the load 14 decreases and the voltage drop across the resistor 13 decreases, the difference between the voltage v,1 and the voltage V increases, and the reference level increases.
この結果、負荷１４に大電流が流れている時には、二次
電池１１の内部抵抗により端子間電圧が低くなるが、そ
の分、基準レー・ルが低下するので、残電力判定手段３
２は二次電池１１から流出する電流の大小とは無関係に
、二次電池１１に蓄えられた電力の残りを正しく判断で
きる。逆に、負荷１４に微小電流しか流れていない時に
は、二次電池１１の端子間電圧が高くなるが、その分基
準レベルも上昇するので、残電力判定手段３２は二次電
池１１に蓄えられた電力の残りを正しく判断できる。As a result, when a large current is flowing through the load 14, the internal resistance of the secondary battery 11 lowers the voltage between the terminals, but the reference rail decreases accordingly, so the remaining power determining means 3
2 can accurately determine the remaining power stored in the secondary battery 11 regardless of the magnitude of the current flowing out from the secondary battery 11. Conversely, when only a small current is flowing through the load 14, the voltage between the terminals of the secondary battery 11 increases, but the reference level also increases accordingly, so the remaining power determining means 32 determines whether the remaining power is stored in the secondary battery 11. You can accurately judge the amount of power remaining.
このように、二次電池１１の内部抵抗による電圧降下は
、残電力判定手段３２の基準レベルの変動により完全に
補償される。言い換えれば、残電力判定手段３２は、二
次電池１１から流出する電流の大小とは無関係に、二次
電池１１に蓄えられた電力の残りを正しく判断できる。In this way, the voltage drop due to the internal resistance of the secondary battery 11 is completely compensated for by fluctuations in the reference level of the remaining power determining means 32. In other words, the remaining power determining means 32 can correctly determine the remaining power stored in the secondary battery 11, regardless of the magnitude of the current flowing out from the secondary battery 11.
ところで、リレー１２の接点１２１が開くと、二次電池
ｌｌの放電が停止されるので、定電圧回路３４の出力電
圧は接地電位（ＩｌｌＩＩち、０ボルト）になる。この
結果、全ての回路の動作が停止し、リレー１２の接点１
２１は開いたままの状態を継続する。By the way, when the contact 121 of the relay 12 is opened, the discharge of the secondary battery ll is stopped, so the output voltage of the constant voltage circuit 34 becomes the ground potential (Illll, 0 volt). As a result, all circuits stop operating, and contact 1 of relay 12
21 continues to remain open.
リレー１２の接点１２１が開いている間に二次電池ｌｌ
を十分に充電し、その後リセットスイッチ３５を一時的
に閉しれば、残電力判定手段３２の動作によりリレー１
２の接点１２１は再び閉じた状態に保持される。While the contact 121 of the relay 12 is open, the secondary battery
If the relay 1 is sufficiently charged and the reset switch 35 is then temporarily closed, the remaining power determining means 32 operates to
The second contact 121 is held closed again.
本発明によれば、二次電池が過放電しなくなるので、二
次電池の寿命が長くなる。According to the present invention, since the secondary battery is not over-discharged, the life of the secondary battery is extended.
また、本発明によれば、二次電池から流出する電流の大
小とは無関係に、二次電池に蓄えられた電力の残りが正
しく判断される。従って二次電池から瞬時的に大電流が
流れ出した時にも放電が停止されることがないので、二
次電池から負荷への電力供給が安定に行える。Further, according to the present invention, the remaining power stored in the secondary battery can be correctly determined regardless of the magnitude of the current flowing out from the secondary battery. Therefore, even when a large current momentarily starts to flow from the secondary battery, discharging is not stopped, so that power can be stably supplied from the secondary battery to the load.
図は本発明を適用した放電容量制御回路の回路図である
。
１１・・・二次電池、１２・・・リレー（放電停止手段
）、１３・・・抵抗（電流センサ）、
１４・・・負荷、１７．２０・・・ボルテージフォロワ
、２３・・・差動増幅器、２６・・・定電圧回路、２７
・・・加減算回路（設定手段）、
２９・・・比較回路、
３０・・・電圧調整回路（電圧センサ）、３２・・・残
電力判定手段。
３３・・・リレードライブ回路、
３０１・・・可変抵抗器。
＼−The figure is a circuit diagram of a discharge capacity control circuit to which the present invention is applied. 11... Secondary battery, 12... Relay (discharge stop means), 13... Resistor (current sensor), 14... Load, 17.20... Voltage follower, 23... Differential Amplifier, 26... Constant voltage circuit, 27
... Addition and subtraction circuit (setting means), 29 ... Comparison circuit, 30 ... Voltage adjustment circuit (voltage sensor), 32 ... Remaining power determination means. 33... Relay drive circuit, 301... Variable resistor. ＼−
Claims (2)
ンサと、 前記二次電池の端子間電圧を検出する電圧センサと、 前記電流センサにより検出された電流の大きさに応じた
基準レベルを設定する設定手段と、前記電圧センサの出
力と前記基準レベルを比較し、前記二次電池に蓄えられ
た残電力の多少を判定する残電力判定手段と、 前記残電力判定手段が残電力が少ないと判断している間
、前記二次電池の放電を停止させる放電停止手段と、 を備えた放電容量制御回路。(1) A secondary battery, a current sensor that detects the magnitude of the current flowing from the secondary battery, a voltage sensor that detects the voltage between terminals of the secondary battery, and the magnitude of the current detected by the current sensor. a setting means for setting a reference level according to the current level; a remaining power determining means for comparing the output of the voltage sensor with the reference level and determining how much remaining power is stored in the secondary battery; A discharge capacity control circuit comprising: discharge stopping means for stopping discharging of the secondary battery while the determining means determines that the remaining power is low.
従って、前記残電力判定手段が前記二次電池の端子電圧
を低いレベルで判定するように前記基準レベルを変更す
る変更手段を備える請求項（１）記載の放電容量制御回
路。(2) The setting means further changes the reference level so that the remaining power determining means determines the terminal voltage of the secondary battery at a lower level as the current detected by the current sensor increases. The discharge capacity control circuit according to claim 1, further comprising changing means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1247058A JPH03108679A (en) | 1989-09-22 | 1989-09-22 | Discharge capacity control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1247058A JPH03108679A (en) | 1989-09-22 | 1989-09-22 | Discharge capacity control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03108679A true JPH03108679A (en) | 1991-05-08 |
Family
ID=17157796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1247058A Pending JPH03108679A (en) | 1989-09-22 | 1989-09-22 | Discharge capacity control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03108679A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07218562A (en) * | 1994-01-31 | 1995-08-18 | Nec Corp | Electric power source apparatus |
| US6034507A (en) * | 1993-12-27 | 2000-03-07 | Hitachi, Ltd. | Electric vehicle with secondary battery power storage system |
| JP2006128052A (en) * | 2004-09-30 | 2006-05-18 | Toshiba Tec Corp | Secondary battery discharge control method and secondary battery discharge control device |
| USRE39908E1 (en) | 1993-12-27 | 2007-11-06 | Hitachi, Ltd. | Secondary battery power storage system |
-
1989
- 1989-09-22 JP JP1247058A patent/JPH03108679A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6034507A (en) * | 1993-12-27 | 2000-03-07 | Hitachi, Ltd. | Electric vehicle with secondary battery power storage system |
| USRE37678E1 (en) | 1993-12-27 | 2002-04-30 | Hitachi, Ltd. | Secondary battery power storage system |
| USRE39749E1 (en) | 1993-12-27 | 2007-07-31 | Hitachi, Ltd. | Electric vehicle with secondary battery power storage system |
| USRE39908E1 (en) | 1993-12-27 | 2007-11-06 | Hitachi, Ltd. | Secondary battery power storage system |
| JPH07218562A (en) * | 1994-01-31 | 1995-08-18 | Nec Corp | Electric power source apparatus |
| JP2006128052A (en) * | 2004-09-30 | 2006-05-18 | Toshiba Tec Corp | Secondary battery discharge control method and secondary battery discharge control device |
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