JPH10274670A - Capacity detection method for secondary battery - Google Patents
Capacity detection method for secondary batteryInfo
- Publication number
- JPH10274670A JPH10274670A JP9080210A JP8021097A JPH10274670A JP H10274670 A JPH10274670 A JP H10274670A JP 9080210 A JP9080210 A JP 9080210A JP 8021097 A JP8021097 A JP 8021097A JP H10274670 A JPH10274670 A JP H10274670A
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- JP
- Japan
- Prior art keywords
- capacity
- secondary battery
- battery
- discharge
- charging
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する分野】本発明は、二次電池の容量を検出
する容量検出方法に関する。The present invention relates to a capacity detection method for detecting the capacity of a secondary battery.
【０００２】[0002]
【従来の技術】ノートパソコンや携帯電話等の携帯型電
子機器においては、その電源として充放電可能な二次電
池（例えば、ニッケルカドミウム電池、ニッケル水素電
池、リチウムイオン二次電池等）が用いられている。こ
うした場合、電源の供給が突然に途絶えて、データが失
われたり使用できなくなることがないように、二次電池
の残存容量を検出して表示するようにしている。また、
充電時にあっては、二次電池がどのような充電状態にあ
るかを容易に判断することができるように、二次電池の
充電容量を検出している。2. Description of the Related Art A portable electronic device such as a notebook personal computer or a portable telephone uses a chargeable / dischargeable secondary battery (for example, a nickel cadmium battery, a nickel hydride battery, a lithium ion secondary battery, etc.) as a power source. ing. In such a case, the remaining capacity of the secondary battery is detected and displayed so that the power supply is not suddenly stopped and data is not lost or becomes unusable. Also,
At the time of charging, the charge capacity of the secondary battery is detected so that the state of charge of the secondary battery can be easily determined.
【０００３】斯る残存容量または充電容量の検出は、通
常、二次電池の放電電流を積算し、この積算量を二次電
池の電池容量から減算することにより、または二次電池
の充電電流を積算していくことにより行っている。更
に、二次電池の劣化や使用環境による二次電池の容量変
化を考慮して、特開平５−８７８９６号公報によれば、
二次電池の放電終止電圧及び満充電電圧の検出に対応し
て、二次電池の容量を０％または１００％として表示す
るように補正している。[0003] The detection of the remaining capacity or the charged capacity is usually performed by integrating the discharge current of the secondary battery and subtracting this integrated amount from the battery capacity of the secondary battery, or by calculating the charge current of the secondary battery. This is done by accumulating. Further, taking into account the deterioration of the secondary battery and the change in the capacity of the secondary battery due to the use environment, according to Japanese Patent Application Laid-Open No. 5-87896,
Correction is made so that the capacity of the secondary battery is displayed as 0% or 100% in accordance with the detection of the discharge end voltage and the full charge voltage of the secondary battery.
【０００４】[0004]
【発明が解決しようとする課題】ところで、こうした二
次電池、特にリチウムイオン二次電池にあっては、放電
時の周囲環境や放電条件により、放電効率が大きく変化
する。図２はリチウムイオン二次電池を条件１（温度３
０℃）及び条件２（温度０℃）において、０．５Ｃの放
電電流で放電したときの電池電圧の変化を示している。
二次電池の電池電圧が放電終止電圧に到達した時点にお
いて、条件１の場合、電池容量の１００％の放電を行う
ことができるものの、条件２の場合、電池容量の８０％
の放電しかできない。By the way, in such a secondary battery, particularly a lithium ion secondary battery, the discharge efficiency greatly changes depending on the surrounding environment and discharge conditions at the time of discharge. FIG. 2 shows the condition 1 (temperature 3) for a lithium ion secondary battery.
0 ° C.) and condition 2 (temperature 0 ° C.) show changes in the battery voltage when the battery was discharged with a discharge current of 0.5 C.
At the time when the battery voltage of the secondary battery reaches the discharge end voltage, in the case of the condition 1, 100% of the battery capacity can be discharged, but in the case of the condition 2, 80% of the battery capacity can be discharged.
Can only discharge.
【０００５】一方、電池容量の表示は、二次電池の放電
終止電圧及び満充電電圧の検出に対応して、二次電池の
容量を０％または１００％とする。従って、条件１のよ
うに、放電終止電圧到達時に１００％の放電となる場合
には何ら問題ないが、条件２のような場合には、放電終
止電圧への到達時、電池容量の表示は０％となっている
ものの、実際には二次電池には２０％の容量が残ってい
る。On the other hand, the battery capacity is displayed by setting the capacity of the secondary battery to 0% or 100% in accordance with the detection of the discharge end voltage and the full charge voltage of the secondary battery. Therefore, there is no problem when 100% discharge occurs when the discharge end voltage is reached as in condition 1, but in the case when condition 2 is reached, the display of the battery capacity is 0 when the discharge end voltage is reached. %, But the actual capacity of the secondary battery is 20%.
【０００６】この状態から二次電池の充電を開始する
と、二次電池は、その充電容量の表示が８０％になった
時点で満充電状態となり、充電容量の表示が正確に行え
ないこととなる。When charging of the secondary battery is started from this state, the secondary battery is fully charged when the display of the charged capacity reaches 80%, and the display of the charged capacity cannot be accurately performed. .
【０００７】図３はこの様子を示すグラフである。同グ
ラフにおいて、横軸は放電時間、縦軸は算出された電池
容量である。実線で示す条件１の場合には、満充電され
て１００％の電池容量となっている状態から放電が行わ
れると、放電時間と共に電池容量が低下し、放電停止電
圧に到達した時点で残存容量の算出結果は０％となる。
この時、二次電池の実際の残存容量も０％であるため、
算出された残存容量と実際の残存容量とは一致してい
る。従って、この状態から二次電池の充電を行ったと
き、算出した充電容量は、正確な二次電池の残存容量を
示す。FIG. 3 is a graph showing this state. In the graph, the horizontal axis represents the discharge time, and the vertical axis represents the calculated battery capacity. In the case of the condition 1 indicated by the solid line, when the battery is discharged from a state where the battery is fully charged and has a battery capacity of 100%, the battery capacity decreases with the discharge time, and the remaining capacity reaches the discharge stop voltage. Is 0%.
At this time, since the actual remaining capacity of the secondary battery is also 0%,
The calculated remaining capacity matches the actual remaining capacity. Therefore, when the secondary battery is charged from this state, the calculated charging capacity indicates an accurate remaining capacity of the secondary battery.
【０００８】一方、破線で示す条件２の場合には、放電
停止電圧に到達して残存容量が０％であると算出された
とき、実際には二次電池に２０％の容量が残っている。
従って、この状態で充電容量を算出しながら充電を行う
と、充電容量が８０％であると算出された時点で、二次
電池は満充電に達してしまう。即ち、算出した充電容量
（換言すれば、表示される充電容量）と実際の二次電池
の充電容量との間に誤差が生じることとなる。On the other hand, in the case of condition 2 indicated by the broken line, when the discharge stop voltage is reached and the remaining capacity is calculated to be 0%, the secondary battery actually has 20% capacity. .
Therefore, if charging is performed while calculating the charge capacity in this state, the secondary battery will reach full charge when the charge capacity is calculated to be 80%. That is, an error occurs between the calculated charging capacity (in other words, the displayed charging capacity) and the actual charging capacity of the secondary battery.
【０００９】[0009]
【課題を解決するための手段】本発明は、二次電池の充
電電流を積算して充電容量を検出すると共に、前記二次
電池の放電電流の積算量を前記充電容量より減算して前
記二次電池の残存容量を検出する二次電池の容量検出方
法において、前記二次電池の放電効率を考慮して前記充
電容量を算出することを特徴としている。According to the present invention, a charging current of a secondary battery is integrated to detect a charging capacity, and an integrated amount of a discharging current of the secondary battery is subtracted from the charging capacity to obtain the secondary battery. A method of detecting the remaining capacity of a secondary battery, wherein the charge capacity is calculated in consideration of the discharge efficiency of the secondary battery.
【００１０】[0010]
【発明の実施の形態】図１は本発明の一実施例を示すブ
ロック回路図であって、１はバッテリーパック、２はパ
ーソナルコンピュータ本体（ＰＣ本体）である。そし
て、バッテリーパック１は、ＰＣ本体２に対して機械的
かつ電気的に着脱可能となっている。FIG. 1 is a block circuit diagram showing an embodiment of the present invention, wherein 1 is a battery pack, and 2 is a personal computer main body (PC main body). The battery pack 1 is mechanically and electrically detachable from the PC main body 2.
【００１１】ＰＣ本体２は、バッテリーパック１に収納
されている二次電池を充電するための充電回路（図示し
ない）と、二次電池の残存容量及び充電容量（以下、こ
れらをまとめて電池容量という）を表示する表示手段と
を備えている。The PC body 2 includes a charging circuit (not shown) for charging a secondary battery housed in the battery pack 1 and a remaining capacity and a charging capacity of the secondary battery (hereinafter, these are collectively referred to as a battery capacity. Display means for displaying the same.
【００１２】次に、バッテリーパック１において、１０
はリチウムイオン二次電池からなる二次電池、１１は二
次電池１０の充放電回路に介挿された充放電スイッチ、
１２は二次電池１０の電池電圧を検出する電圧検出回路
であり、特に、二次電池１０が満充電電圧及び放電終止
電圧になったとき、検出信号を発生する。Next, in the battery pack 1, 10
Is a secondary battery comprising a lithium ion secondary battery, 11 is a charge / discharge switch interposed in a charge / discharge circuit of the secondary battery 10,
A voltage detection circuit 12 detects the battery voltage of the secondary battery 10, and generates a detection signal when the secondary battery 10 reaches the full charge voltage and the discharge end voltage.
【００１３】１３は二次電池１０に熱的に結合されたサ
ーミスタ、１４はサーミスタ１３の出力に基づいて二次
電池１０の電池温度を検出する温度検出回路、１５は二
次電池１０の充放電回路に介挿された電流検出抵抗、１
６は電流検出抵抗１５の出力に基づいて充電電流及び放
電電流を検出する電流検出回路、１７は電圧検出回路１
２、温度検出回路１４及び電流検出回路１６からの検出
信号を受けて、種々の算出及び演算処理を行う演算回路
である。Reference numeral 13 denotes a thermistor thermally coupled to the secondary battery 10, reference numeral 14 denotes a temperature detection circuit for detecting the battery temperature of the secondary battery 10 based on the output of the thermistor 13, and reference numeral 15 denotes charging and discharging of the secondary battery 10. Current detection resistor inserted in the circuit, 1
Reference numeral 6 denotes a current detection circuit for detecting a charge current and a discharge current based on the output of the current detection resistor 15, and 17 denotes a voltage detection circuit 1.
2. An arithmetic circuit that receives detection signals from the temperature detection circuit 14 and the current detection circuit 16 and performs various calculation and arithmetic processing.
【００１４】演算回路１７は、電流検出回路１６により
検出された放電電流を積算することにより、二次電池１
０の放電容量を算出し、この放電容量を二次電池１０の
充電容量から減算することによって、二次電池１０の残
存容量を検出する。また、二次電池１０の電池電圧が放
電終止電圧になったことが、電圧検出回路１２により検
出されると、演算回路１７は、電圧検出回路１２よりの
検出信号を受けて、二次電池１０の残存容量を０％とす
る。The arithmetic circuit 17 accumulates the discharge current detected by the current detection circuit 16 to obtain the secondary battery 1.
By calculating a discharge capacity of 0 and subtracting this discharge capacity from the charge capacity of the secondary battery 10, the remaining capacity of the secondary battery 10 is detected. When the voltage detection circuit 12 detects that the battery voltage of the secondary battery 10 has reached the discharge end voltage, the arithmetic circuit 17 receives the detection signal from the voltage detection circuit 12 and Is 0%.
【００１５】一方、演算回路１７は、電流検出回路１６
により検出された充電電流を積算することにより、二次
電池１０の充電容量を算出する。そして、これを積算す
ることによって、二次電池１０の充電容量を検出する。
また、二次電池１０の電池電圧が満充電電圧になったこ
とが、電圧検出回路１２により検出されると、演算回路
１７は、電圧検出回路１２よりの検出信号を受けて、二
次電池１０の充電容量を１００％とする。On the other hand, the arithmetic circuit 17 comprises a current detecting circuit 16
The charging capacity of the secondary battery 10 is calculated by integrating the charging currents detected by the above. Then, by integrating this, the charge capacity of the secondary battery 10 is detected.
When the voltage detection circuit 12 detects that the battery voltage of the secondary battery 10 has reached the fully charged voltage, the arithmetic circuit 17 receives the detection signal from the voltage detection circuit 12 and Is set to 100%.
【００１６】なお、図１において、１８は充放電端子、
１９は演算回路１７とＰＣ本体２との間の通信端子であ
り、例えば、演算回路１７により演算された二次電池１
０の電池容量に関するデータが、ＰＣ本体２に送信され
る。In FIG. 1, reference numeral 18 denotes a charge / discharge terminal;
Reference numeral 19 denotes a communication terminal between the arithmetic circuit 17 and the PC main body 2, for example, the secondary battery 1 operated by the arithmetic circuit 17
Data regarding the battery capacity of 0 is transmitted to the PC main body 2.
【００１７】以下、本発明の動作について詳細に説明す
る。バッテリーパック１をＰＣ本体２に装着し、充放電
端子１８よりＰＣ本体２に放電電流を供給することによ
り、二次電池１０の放電が行われる。演算回路１７は、
電流検出抵抗１５及び電流検出回路１６により検出され
た放電電流を積算して放電容量を算出する。そして、二
次電池１０の充電容量からこの放電容量を減算して、二
次電池１０の残存容量を算出する。算出された残存容量
は、逐次通信端子１９よりＰＣ本体２に送信され、ＰＣ
本体２にて表示される。Hereinafter, the operation of the present invention will be described in detail. The secondary battery 10 is discharged by mounting the battery pack 1 on the PC main body 2 and supplying a discharge current to the PC main body 2 from the charging / discharging terminal 18. The arithmetic circuit 17
The discharge capacity detected by integrating the discharge currents detected by the current detection resistor 15 and the current detection circuit 16 is calculated. Then, the discharge capacity is subtracted from the charge capacity of the secondary battery 10 to calculate the remaining capacity of the secondary battery 10. The calculated remaining capacity is sequentially transmitted from the communication terminal 19 to the PC
It is displayed on the main body 2.
【００１８】一方、斯る残存容量の算出と同時に、二次
電池１０の電池電圧が電圧検出回路１２により検出され
ている。そして、二次電池１０の電池電圧が放電終止電
圧に到達したことが検出されると、演算回路１７は、二
次電池１０の残存容量を０％であると補正する。尚、こ
の時に算出された残存容量が０％でない場合、演算回路
１７は、その残存容量値を記憶しておく。On the other hand, the battery voltage of the secondary battery 10 is detected by the voltage detection circuit 12 simultaneously with the calculation of the remaining capacity. Then, when it is detected that the battery voltage of the secondary battery 10 has reached the discharge end voltage, the arithmetic circuit 17 corrects the remaining capacity of the secondary battery 10 to be 0%. If the remaining capacity calculated at this time is not 0%, the arithmetic circuit 17 stores the remaining capacity value.
【００１９】一方、バッテリーパック１をＰＣ本体２に
装着して充放電端子１８より充電電流を供給することに
よって、二次電池１０の充電が行われる。この時、演算
回路１７は、電流検出抵抗１５及び電流検出回路１６に
より所定のサンプリング周期で検出した充電電流を積算
することにより、二次電池１０の充電容量を算出する。On the other hand, the secondary battery 10 is charged by mounting the battery pack 1 on the PC body 2 and supplying a charging current from the charging / discharging terminal 18. At this time, the arithmetic circuit 17 calculates the charge capacity of the secondary battery 10 by integrating the charge currents detected by the current detection resistor 15 and the current detection circuit 16 at a predetermined sampling cycle.
【００２０】具体的には、充電容量の算出は、以下の算
出式に基づいて行われる。 Ｙ＝Σ［Ｙｓ×η×Ｙｏ×（１００−Ｘ）÷Ｙｈ÷１０
０］ なお、この算出式における各項目は、以下の通りであ
る。 Ｙｓ：所定のサンプリング周期でサンプリングした充電
容量（ｍＡｈ） η：充電効率（％） Ｙｏ：二次電池の本来の電池容量（ｍＡｈ） Ｘ：充電開始時点で算出されている二次電池の残存容量
値（％） Ｙｈ：充電開始前に放電された二次電池の放電容量（ｍ
Ａｈ） 斯る算出式において、（Ｙｏ÷Ｙｈ÷１００）は二次電
池の放電効率ηｏの逆数を示す値であり、前述の算出式
は以下のように示される。 Ｙ＝Σ［Ｙｓ×η×（１００−Ｘ）÷ηｏ］ この算出式を用いて二次電池１０の充電容量を算出する
ことによって、図３に一点鎖線で示すように、条件２に
よる放電が行われた二次電池１０においても、これの満
充電が検出された時点で算出された充電容量は、１００
％となる。Specifically, the calculation of the charging capacity is performed based on the following formula. Y = {[Ys × η × Yo × (100−X) ÷ Yh} 10
0] Note that each item in this calculation formula is as follows. Ys: charging capacity (mAh) sampled at a predetermined sampling cycle η: charging efficiency (%) Yo: original battery capacity of the secondary battery (mAh) X: remaining capacity of the secondary battery calculated at the start of charging Value (%) Yh: Discharge capacity of the secondary battery discharged before the start of charging (m
Ah) In such a calculation formula, (Y ÷ Yh ÷ 100) is a value indicating the reciprocal of the discharge efficiency ηo of the secondary battery, and the above calculation formula is expressed as follows. Y = {[Ys × η × (100−X) ÷ ηo] By calculating the charge capacity of the secondary battery 10 using this calculation formula, as shown by the dashed line in FIG. Also in the performed secondary battery 10, the charge capacity calculated at the time when the full charge is detected is 100
%.
【００２１】具体例として、今、本来の電池容量（＝Ｙ
ｏ）が１０００ｍＡｈである二次電池１０を放電終止電
圧まで放電した（従って、Ｘ＝０となる）場合、その時
の二次電池１０の放電容量（＝Ｙｈ）が８００ｍＡｈで
あったとすると、前述の算出式は、Ｙ＝Σ［Ｙｓ×η×
１０／８］となる。As a specific example, the original battery capacity (= Y
When the secondary battery 10 of which o) was 1000 mAh was discharged to the discharge cutoff voltage (thus, X = 0), assuming that the discharge capacity (= Yh) of the secondary battery 10 at that time was 800 mAh, The calculation formula is Y = Σ [Ys × η ×
10/8].
【００２２】[0022]
【発明の効果】本発明は、二次電池の充電電流を積算し
て充電容量を検出すると共に、前記二次電池の放電電流
の積算量を前記充電容量より減算して前記二次電池の残
存容量を検出する二次電池の容量検出方法において、前
記二次電池の放電効率を考慮して前記充電容量を算出す
るので、二次電池の充放電時の充放電環境等による悪影
響を受けることなく、二次電池の充電容量を正確に検出
することができる。According to the present invention, the charging current of the secondary battery is integrated to detect the charging capacity, and the integrated amount of the discharging current of the secondary battery is subtracted from the charging capacity to calculate the remaining capacity of the secondary battery. In the capacity detection method of the secondary battery for detecting the capacity, since the charge capacity is calculated in consideration of the discharge efficiency of the secondary battery, without being adversely affected by the charge / discharge environment or the like at the time of charge / discharge of the secondary battery In addition, the charging capacity of the secondary battery can be accurately detected.
【図１】本発明の一実施例を示すブロック回路である。FIG. 1 is a block circuit showing an embodiment of the present invention.
【図２】二次電池の放電時の電圧変化を示すグラフであ
る。FIG. 2 is a graph showing a voltage change when a secondary battery is discharged.
【図３】算出される電池容量の変化を示すグラフであ
る。FIG. 3 is a graph showing a change in a calculated battery capacity.
１ バッテリーパック ２ ＰＣ本体 １０ 二次電池 １７ 演算回路 DESCRIPTION OF SYMBOLS 1 Battery pack 2 PC main body 10 Secondary battery 17 Operation circuit
Claims (2)
を検出すると共に、前記二次電池の放電電流の積算量を
前記充電容量より減算して前記二次電池の残存容量を検
出する二次電池の容量検出方法において、前記二次電池
の放電効率を考慮して前記充電容量を算出することを特
徴とする二次電池の容量検出方法。1. A method of integrating a charge current of a secondary battery to detect a charge capacity, and detecting a remaining capacity of the secondary battery by subtracting an integrated amount of a discharge current of the secondary battery from the charge capacity. A method of detecting the capacity of a secondary battery, comprising calculating the charge capacity in consideration of the discharge efficiency of the secondary battery.
された充電容量、η：充電効率、Ｘ：充電開始時点で算
出されている二次電池の残存容量値、ηｏ：放電効率）
の算出式により算出されることを特徴とする請求項１の
二次電池の容量検出方法。2. The charge capacity is as follows: Y = {[Ys × η × (100−X)} ηo] (where, Ys: charge capacity sampled at a predetermined sampling cycle, η: charge efficiency, X: charge) (Remaining capacity value of the secondary battery calculated at the start time, ηo: discharge efficiency)
2. The method for detecting the capacity of a secondary battery according to claim 1, wherein the capacity is calculated by the following formula.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08021097A JP3392693B2 (en) | 1997-03-31 | 1997-03-31 | Rechargeable battery capacity detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08021097A JP3392693B2 (en) | 1997-03-31 | 1997-03-31 | Rechargeable battery capacity detection method |
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| Publication Number | Publication Date |
|---|---|
| JPH10274670A true JPH10274670A (en) | 1998-10-13 |
| JP3392693B2 JP3392693B2 (en) | 2003-03-31 |
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| JP08021097A Expired - Fee Related JP3392693B2 (en) | 1997-03-31 | 1997-03-31 | Rechargeable battery capacity detection method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002065612A1 (en) * | 2001-02-14 | 2002-08-22 | Sony Corporation | Charging/discharging apparatus and method, power supplying apparatus and method, power supplying system and method, program storage medium, and program |
| JP2002236155A (en) * | 2001-02-07 | 2002-08-23 | Sanyo Electric Co Ltd | Remaining capacity operation method of battery |
| WO2003061055A1 (en) * | 2001-12-27 | 2003-07-24 | Panasonic Ev Energy Co., Ltd. | Method and device for estimating remaining capacity of secondary cell, battery pack system, and electric vehicle |
| US6969973B2 (en) | 2002-11-08 | 2005-11-29 | Sanyo Electric Co., Ltd. | Apparatus for calculating remaining battery capacity |
| JP2011053097A (en) * | 2009-09-02 | 2011-03-17 | Panasonic Corp | Discharge management circuit and battery pack |
| CN102890243A (en) * | 2011-07-20 | 2013-01-23 | 海洋王照明科技股份有限公司 | Measuring circuit and measuring device for battery capacity as well as battery capacity meter |
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- 1997-03-31 JP JP08021097A patent/JP3392693B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002236155A (en) * | 2001-02-07 | 2002-08-23 | Sanyo Electric Co Ltd | Remaining capacity operation method of battery |
| WO2002065612A1 (en) * | 2001-02-14 | 2002-08-22 | Sony Corporation | Charging/discharging apparatus and method, power supplying apparatus and method, power supplying system and method, program storage medium, and program |
| JP2002238175A (en) * | 2001-02-14 | 2002-08-23 | Sony Corp | Charging/discharging device and method, power supply device and method, power supply system and method, program storage medium and program |
| US6825639B2 (en) | 2001-02-14 | 2004-11-30 | Sony Corporation | Charging/discharging apparatus and method, power supplying apparatus and method, power supplying system and method, program storage medium, and program |
| US7096130B2 (en) | 2001-02-14 | 2006-08-22 | Sony Corporation | Charging/discharging apparatus and method, power supplying apparatus and method, program storing medium, and program |
| WO2003061055A1 (en) * | 2001-12-27 | 2003-07-24 | Panasonic Ev Energy Co., Ltd. | Method and device for estimating remaining capacity of secondary cell, battery pack system, and electric vehicle |
| US7339351B2 (en) | 2001-12-27 | 2008-03-04 | Panasonic Ev Energy Co., Ltd. | Method and apparatus for estimating remaining capacity of secondary battery |
| US6969973B2 (en) | 2002-11-08 | 2005-11-29 | Sanyo Electric Co., Ltd. | Apparatus for calculating remaining battery capacity |
| JP2011053097A (en) * | 2009-09-02 | 2011-03-17 | Panasonic Corp | Discharge management circuit and battery pack |
| CN102890243A (en) * | 2011-07-20 | 2013-01-23 | 海洋王照明科技股份有限公司 | Measuring circuit and measuring device for battery capacity as well as battery capacity meter |
| CN102890243B (en) * | 2011-07-20 | 2016-08-24 | 海洋王照明科技股份有限公司 | A kind of battery electric quantity measuring circuit, measurement apparatus and battery meter |
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