JPH03180784A - Calculator for residual capacity of battery - Google Patents
Calculator for residual capacity of batteryInfo
- Publication number
- JPH03180784A JPH03180784A JP1320843A JP32084389A JPH03180784A JP H03180784 A JPH03180784 A JP H03180784A JP 1320843 A JP1320843 A JP 1320843A JP 32084389 A JP32084389 A JP 32084389A JP H03180784 A JPH03180784 A JP H03180784A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- temperature
- voltage
- circuit voltage
- open
- 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
- 238000000034 method Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 230000001419 dependent effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 229910005580 NiCd Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、電池残量、即ち電池の充放重度を演算により
推定する電池残量演算装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a battery remaining amount calculation device that estimates the remaining battery amount, that is, the degree of charging and discharging of the battery, by calculation.
［従来の技術］
従来、バッテリを電力源とする機器では、バッテリの電
池残量を検出する方法として、バッテリの放電電圧を監
視する構成、フル充電状態からの放電時間を積算して消
費電力を累積し、電池残量を推定する構成等があり、充
電装置の場合には、充電電圧の変化を監視する構成があ
る。[Prior Art] Conventionally, in devices that use batteries as a power source, methods for detecting the remaining battery power include monitoring the discharge voltage of the battery, and calculating power consumption by integrating the discharge time from a fully charged state. There is a configuration that accumulates and estimates the remaining battery power, and in the case of a charging device, there is a configuration that monitors changes in charging voltage.
［発明が解決しようとする課題］
しかしバッテリの端子電圧を使用する従来の構成では、
個々のバッテリのバラツキにより、残量を時間として定
量的に表示することが極めて困難であり、単に、バッテ
リの容量が無くなることの目安にしかならない。また、
充電する場合でも、どの程度充電されているかを定量的
に把握することができない。[Problem to be solved by the invention] However, in the conventional configuration that uses the terminal voltage of the battery,
Due to variations in individual batteries, it is extremely difficult to quantitatively display the remaining capacity in terms of time, and it can only be used as a guide to when the battery capacity is running out. Also,
Even when charging, it is not possible to quantitatively determine how much the battery has been charged.
また、放電時間及び／又は放電電流を積算する構成では
、フル充電状態から使用開始し、積算を開始しなければ
ならず、半充電のバッテリには適用できない。また、予
想されない使用状態の変化には適応できず、判定値は信
用できない値になる。Further, in the configuration in which the discharge time and/or discharge current are integrated, use must be started from a fully charged state and integration must be started, and this cannot be applied to a half-charged battery. Furthermore, it is not possible to adapt to unexpected changes in usage conditions, and the determination value becomes an unreliable value.
そこで本発明は、このような欠点の無い電池残量演算装
置を提示することを目的とする。Therefore, an object of the present invention is to provide a battery remaining amount calculation device that does not have such drawbacks.
［課題を解決するための手段］
本発明に係る電池残量演算装置は、所定負荷時における
電池出力の温度誤差を補正した測定値から開路電圧を求
め、この開路電圧を当該電池の開路電圧対電池残量特性
と比較して当該電池の電池残量を求めることを特徴とす
る。[Means for Solving the Problems] A battery remaining amount calculation device according to the present invention calculates an open circuit voltage from a measured value corrected for temperature error in battery output at a predetermined load, and compares this open circuit voltage with the open circuit voltage of the battery. The present invention is characterized in that the remaining battery power of the battery is determined by comparing it with the remaining battery power characteristics.
［作用］
上記手段により、正確且つ定量的に電池残量を求めるこ
とができ、更に、開路電圧の温度誤差を相殺でき、従っ
て使用温度にかかわりなく、精確に且つ定量的に電池残
量を推定できる。[Function] With the above means, the remaining battery capacity can be determined accurately and quantitatively, and the temperature error of the open circuit voltage can be offset, so the remaining battery capacity can be estimated accurately and quantitatively regardless of the operating temperature. can.
［実施例］ 以下、図面を参照して本発明の詳細な説明する。[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.
第１図は本発明の一実施例の構成ブロック図を示す。１
０は測定しようとするバッテリであり、開路電圧（内部
起電圧）Ｅｏの理想的な電池部分と抵抗値ｒ０の内部抵
抗の直列回路からなる。１２゜１４は既知の抵抗値を持
つ抵抗であり、スイッチ１６により選択的にバッテリ１
０に接続される。FIG. 1 shows a block diagram of an embodiment of the present invention. 1
0 is the battery to be measured, which is composed of a series circuit of an ideal battery part with an open circuit voltage (internal electromotive voltage) Eo and an internal resistance with a resistance value r0. 12 and 14 are resistors with known resistance values, and the switch 16 selectively connects the battery 1.
Connected to 0.
１８はバッテリ１０に抵抗１２．１４を接続した場合に
抵抗１２．１４に流れる電流り、 １．を測定し、電圧
信号に変換して出力する電流計、２０は負荷抵抗１２又
は同１４によるバッテリ１０の放電電圧Ｖ１． Ｖ、を
ディジタル化し、電流計１８の測定電流値をディジタル
化するＡ／Ｄ変換器、２２はスイッチ１６を制御すると
共に、測定された電圧値及び電流値からバッテリ１０の
開路電圧を計算し、充放電度を判定するマイクロコンピ
ュータからなる演算回路、２４は演算回路２２の判定結
果を表示する表示装置、２６はバッテリの充放電度の判
定に必要なデータを記憶するメモリである。18 is the current that flows through the resistor 12.14 when the resistor 12.14 is connected to the battery 10; 1. An ammeter 20 measures the discharge voltage V1. An A/D converter 22 digitizes the current value measured by the ammeter 18 and controls the switch 16, and calculates the open circuit voltage of the battery 10 from the measured voltage value and current value, 24 is a display device that displays the determination result of the arithmetic circuit 22; and 26 is a memory that stores data necessary for determining the degree of charge and discharge of the battery.
スイッチ１６をａ接点に接続した時の負荷抵抗１２によ
る電流をＩ１、そのときのバッテリ１０の端子間電圧を
■１、スイッチ１６をｂ接点に接続したときの負荷抵抗
１４による電流をＩ２、そのときのバッテリ１０の端子
間電圧をｖ２とし、バッテリ１０の開路電圧をＥｏ、内
部抵抗をｒｏとすると、Ｅ０＝Ｖ、＋■１・ｒ。I1 is the current flowing through the load resistor 12 when the switch 16 is connected to the A contact, ■1 is the voltage between the terminals of the battery 10 at that time, I2 is the current flowing through the load resistor 14 when the switch 16 is connected to the B contact, and When the voltage between the terminals of the battery 10 is v2, the open circuit voltage of the battery 10 is Eo, and the internal resistance is ro, E0=V, +■1·r.
＝ｖ２＋Ｉ２・ｒｏ
＝（＋２ＶＩ ＬＶｚ）／ （Ｉｔ ＩＩ）但し、
ｒｏ＝ （ｖ＋−ｖ２） ／ （Ｉ２−ＩＩ）で
ある。=v2+I2·ro=(+2VI LVz)/(It II) However, ro=(v+-v2)/(I2-II).
この開路電圧は温度が一定であれば、個々のバッテリで
のバラツキが少ないため、開路電圧に基づいて残量を求
めることによって正確な残量検出を実現できる。しかし
ながら、この開路電圧は、第２図に示すような温度特性
を持つ。第２図は、ＮｉＣｄ電池に所定の負荷を接続し
た場合の放電特性を示す。縦軸は開路電圧を示し、横軸
は電池残量を時間で示す。開路電圧は、低温より常温、
常温より高温で高くなる。本実施例では、第２図の常温
の特性曲線をデータ化してメモリ２６に格納し、他方、
電圧電流の測定値を温度補正して開路電圧を求め、この
開路電圧をメモリ２６のデータに当てはめてバッテリ１
０の充放電度を定量的に判定する。第２図の放電特性を
データ化する方法としては、残量時間を開路電圧の近似
関数とする方法、テーブル化しておき、得られた開路電
圧値に近似する開路電圧に対するデータを内挿する方法
などがある。If the temperature is constant, this open-circuit voltage has little variation among individual batteries, so by determining the remaining capacity based on the open-circuit voltage, accurate remaining capacity detection can be realized. However, this open circuit voltage has temperature characteristics as shown in FIG. FIG. 2 shows the discharge characteristics when a predetermined load is connected to the NiCd battery. The vertical axis shows the open circuit voltage, and the horizontal axis shows the remaining battery power in time. The open circuit voltage is higher at room temperature than at low temperature.
It becomes higher at high temperatures than at room temperature. In this embodiment, the characteristic curve at room temperature shown in FIG. 2 is converted into data and stored in the memory 26, and on the other hand,
The open circuit voltage is obtained by temperature-correcting the measured voltage and current values, and this open circuit voltage is applied to the data in the memory 26 to calculate the battery 1.
Quantitatively determine the degree of charge and discharge of 0. Methods for converting the discharge characteristics shown in Figure 2 into data include using the remaining amount of time as an approximate function of the open-circuit voltage, and creating a table and interpolating data for the open-circuit voltage that approximates the obtained open-circuit voltage value. and so on.
第３図は演算回路２２の動作フローチャートを示す。演
算回路２２は、スイッチ１６を先ずａ接点に接続しくＳ
ｌ）、抵抗１２に流れる電流り及びバッテリ１０の端子
間電圧Ｖ、を読み込む（Ｓ２）。次に、スイッチ１６を
ｂ接点に接続して（Ｓ３）、同様に、抵抗１４による電
流Ｉ、及びバッテリ１０の端子間電圧Ｖ、を読み込む（
Ｓ４）。Ｓ２．４”ｉ１’得た１１． ＩＩ Ｖｌ。FIG. 3 shows an operation flowchart of the arithmetic circuit 22. The arithmetic circuit 22 first connects the switch 16 to the a contact point S.
l), the current flowing through the resistor 12 and the voltage V between the terminals of the battery 10 are read (S2). Next, connect the switch 16 to the b contact (S3), and similarly read the current I through the resistor 14 and the voltage V between the terminals of the battery 10 (
S4). S2.4"i1' obtained 11. II Vl.
■２から、上記式に従い開路電圧Ｅ０を計算する（Ｓ５
）。■From 2, calculate the open circuit voltage E0 according to the above formula (S5
).
このようにして得た開路電圧Ｅ０を、メモリ２６に格納
した開路電圧Ｅ対電池残量時間Ｔの関係データ（第２図
）に当てはめて、開路電圧Ｅ０に対応する電池残量時間
Ｔ０を求める（Ｓ６）。そして、表示すべきときには（
Ｓ７）、表示装置２４により、電池残量時間Ｔ０を所定
の態様で表示する（Ｓ８）。The open circuit voltage E0 obtained in this way is applied to the relationship data of the open circuit voltage E versus the remaining battery time T stored in the memory 26 (Fig. 2) to determine the remaining battery time T0 corresponding to the open circuit voltage E0. (S6). And when it should be displayed (
S7), the remaining battery time T0 is displayed in a predetermined manner on the display device 24 (S8).
以上の動作を循環的に行なうことにより、バッテリ１０
の電池残量時間を定量的に知ることができる。By performing the above operations cyclically, the battery 10
You can quantitatively know the remaining battery time.
第４図はＡ／Ｄ変換器２０の部分の具体的構成を示す。FIG. 4 shows a specific configuration of the A/D converter 20 portion.
Ａ／Ｄ変換器２０はバッテリ１０の端子間電圧Ｖ、、
Ｖ、と、温度依存回路３０により温度補償された比較基
準電圧とを比較して、当該端子間電圧Ｖ、、 Ｖ、をデ
ィジタル化する。第５図及び第６図は温度依存回路３０
の回路例を示す。第５図では、通常の抵抗３２と、温度
が上昇する程抵抗値が上がる温度正特性素子（例えば、
正特性サーミスタ等）３４を直列接続して、直流電圧■
３を印加し、抵抗３２と温度正特性素子３４の接続点の
電圧を比較基準電圧としてＡ／Ｄ変換器２０に印加する
。また、第６図では、温度が上昇する程抵抗値が下がる
温度負特性素子（例えば、負特性サーミスタ等）３６と
通常の抵抗３８を直列接続して、直流電圧■８を印加し
、温度負特性素子３６と抵抗３８の接続点の電圧を比較
基準電圧としてＡ／Ｄ変換器２０に印加する。第５図及
び第６図では、温度が上がると、Ａ／Ｄ変換器２０に印
加される比較基準電圧が上昇し、バッテリ１０の端子間
電圧の温度上昇分が相殺される。The A/D converter 20 detects the terminal voltage V of the battery 10,
The inter-terminal voltages V, , V, are digitized by comparing V with a comparison reference voltage temperature-compensated by the temperature dependent circuit 30. 5 and 6 are temperature dependent circuits 30.
An example of the circuit is shown below. In FIG. 5, a normal resistor 32 and a temperature positive characteristic element (for example,
Positive characteristic thermistor, etc.) 34 are connected in series, and the DC voltage is
3 is applied, and the voltage at the connection point between the resistor 32 and the temperature positive characteristic element 34 is applied to the A/D converter 20 as a comparison reference voltage. In addition, in Fig. 6, a temperature negative characteristic element (for example, a negative characteristic thermistor, etc.) whose resistance value decreases as the temperature rises is connected in series with a normal resistor 38, and a DC voltage 8 is applied. The voltage at the connection point between the characteristic element 36 and the resistor 38 is applied to the A/D converter 20 as a comparison reference voltage. In FIGS. 5 and 6, when the temperature rises, the comparison reference voltage applied to the A/D converter 20 increases, and the temperature increase in the voltage between the terminals of the battery 10 is offset.
第７図はＡ／Ｄ変換器２０の部分の別の構成例を示す。FIG. 7 shows another configuration example of the A/D converter 20 portion.
バッテリ１０の端子間電圧り、Ｖ２を温度依存回路４０
を介してＡ／Ｄ変換器２０の一方の入力に印加し、Ａ／
Ｄ変換器２０の他方の比較基準電圧入力端子には基準電
圧４２の出力を印加する。第８図及び第９図は温度依存
回路４０の具体例を示す。４４．５０は抵抗、４６は温
度負特性素子、４８は温度正特性素子である。温度が上
昇すると、温度負特性素子４６又は温度正特性素子４８
によりバッテリ１０の端子間電圧Ｖ、、 Ｖ、は下げら
れてＡ／Ｄ変換器２０に印加される。即ち、バッテリ１
０の端子間電圧の温度上昇分が相殺される。The voltage between the terminals of the battery 10, V2, is determined by the temperature-dependent circuit 40.
is applied to one input of the A/D converter 20 via the A/D converter 20.
The output of the reference voltage 42 is applied to the other comparison reference voltage input terminal of the D converter 20. 8 and 9 show specific examples of the temperature dependent circuit 40. FIG. 44.50 is a resistor, 46 is a temperature negative characteristic element, and 48 is a temperature positive characteristic element. When the temperature rises, the temperature negative characteristic element 46 or the temperature positive characteristic element 48
As a result, the voltage V, , V, between the terminals of the battery 10 is lowered and applied to the A/D converter 20. That is, battery 1
The temperature rise in the voltage between terminals of 0 is canceled out.
二次電池の場合を例に説明したが、勿論、−次電池の電
池残量を得る場合にも適用できる。Although the case of a secondary battery has been described as an example, the present invention can of course also be applied to the case of obtaining the remaining battery power of a secondary battery.
し発明の効果］
以上の説明から容易に理解できるように、本発明によれ
ば、温度誤差なしに正確且つ定量的に電池の残量を把握
できるようになる。Effects of the Invention] As can be easily understood from the above description, according to the present invention, it is possible to accurately and quantitatively grasp the remaining battery power without temperature error.
第１図は本発明の一実施例の構成ブロック図、第２図は
バッテリの開路電圧対電池残量時間の特性図、第３図は
第１図の動作フローチャート、第４図はＡ／Ｄ変換器２
０の部分の構成例、第５図及び第６図は第５図の温度依
存回路３０の回路例、第７図はＡ／Ｄ変換器２０の部分
の別の構成例、第８図及び第９図は第７図の温度依存回
路４００回路例である。
ｌＯ：バッテリ １２，１４：負荷抵抗 １６：スイッ
チ １８：電流計 ２０：Ａ／Ｄ変換器２：演算回路
２４：表示装置 ２６：メモリ３０．４０＋ｍ度依存回
路Fig. 1 is a block diagram of the configuration of an embodiment of the present invention, Fig. 2 is a characteristic diagram of battery open circuit voltage versus remaining battery time, Fig. 3 is an operation flowchart of Fig. 1, and Fig. 4 is an A/D converter 2
5 and 6 are examples of the configuration of the temperature dependent circuit 30 in FIG. 5. FIG. 7 is another example of the configuration of the A/D converter 20 portion, and FIGS. FIG. 9 is an example of the temperature dependent circuit 400 shown in FIG. lO: Battery 12, 14: Load resistance 16: Switch 18: Ammeter 20: A/D converter 2: Arithmetic circuit
24: Display device 26: Memory 30.40 + m degree dependent circuit
Claims (1)
値から開路電圧を求め、この開路電圧を当該電池の開路
電圧対電池残量特性と比較して当該電池の電池残量を求
めることを特徴とする電池残量演算装置。The method is characterized in that the open circuit voltage is determined from the measured value corrected for the temperature error of the battery output at a given load, and the remaining battery capacity of the battery is determined by comparing this open circuit voltage with the open circuit voltage vs. remaining battery capacity characteristic of the battery. Battery remaining amount calculation device.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1320843A JPH03180784A (en) | 1989-12-11 | 1989-12-11 | Calculator for residual capacity of battery |
| EP90123690A EP0432689B1 (en) | 1989-12-11 | 1990-12-10 | Remaining-amount-of-battery detecting device |
| DE69030063T DE69030063T2 (en) | 1989-12-11 | 1990-12-10 | Battery residual charge determination arrangement |
| US07/968,250 US6150823A (en) | 1989-12-11 | 1992-10-29 | Battery charge detecting variable loads |
| US09/615,207 US6232747B1 (en) | 1989-12-11 | 2000-07-13 | Remaining-amount-of-battery detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1320843A JPH03180784A (en) | 1989-12-11 | 1989-12-11 | Calculator for residual capacity of battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03180784A true JPH03180784A (en) | 1991-08-06 |
Family
ID=18125865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1320843A Pending JPH03180784A (en) | 1989-12-11 | 1989-12-11 | Calculator for residual capacity of battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03180784A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5708351A (en) * | 1995-08-25 | 1998-01-13 | Nec Corporation | Battery pack with a lithium ion secondary battery |
| JP2009145277A (en) * | 2007-12-17 | 2009-07-02 | Fujitsu Telecom Networks Ltd | Current detection circuit |
| US9005147B2 (en) | 2008-03-19 | 2015-04-14 | Kohler Co. | Transducer mounting assembly for plumbing fixture |
| CN113678008A (en) * | 2019-01-04 | 2021-11-19 | 株式会社Lg新能源 | Battery current measuring device and method |
-
1989
- 1989-12-11 JP JP1320843A patent/JPH03180784A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5708351A (en) * | 1995-08-25 | 1998-01-13 | Nec Corporation | Battery pack with a lithium ion secondary battery |
| JP2009145277A (en) * | 2007-12-17 | 2009-07-02 | Fujitsu Telecom Networks Ltd | Current detection circuit |
| US9005147B2 (en) | 2008-03-19 | 2015-04-14 | Kohler Co. | Transducer mounting assembly for plumbing fixture |
| CN113678008A (en) * | 2019-01-04 | 2021-11-19 | 株式会社Lg新能源 | Battery current measuring device and method |
| JP2022516862A (en) * | 2019-01-04 | 2022-03-03 | エルジー エナジー ソリューション リミテッド | Battery current measuring device and method |
| US11835585B2 (en) | 2019-01-04 | 2023-12-05 | Lg Energy Solution, Ltd. | Battery current measuring device and method |
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