JPH1138107A - Method for estimating residual capacity of secondary battery - Google Patents
Method for estimating residual capacity of secondary batteryInfo
- Publication number
- JPH1138107A JPH1138107A JP9209726A JP20972697A JPH1138107A JP H1138107 A JPH1138107 A JP H1138107A JP 9209726 A JP9209726 A JP 9209726A JP 20972697 A JP20972697 A JP 20972697A JP H1138107 A JPH1138107 A JP H1138107A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- capacity
- discharge
- discharge current
- change
- 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
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Classifications
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- 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
- Electric Propulsion And Braking For Vehicles (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電気自動車等に使用
される二次電池の残存容量を正確に推定することができ
る残存容量推定方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remaining capacity estimating method capable of accurately estimating the remaining capacity of a secondary battery used in an electric vehicle or the like.
【０００２】[0002]
【従来の技術】電気自動車等において、その動力源とし
て使用される二次電池の残存容量を表示して再充電を促
す等のために、残存容量を正確に推定する方法が求めら
れている。この二次電池の等価回路を図７に示し、起電
力Ｅに直列に内部抵抗Ｒが位置している。したがって、
二次電池の端子電圧Ｖは放電電流をＩとして、式（１）
で示される。残存容量とは、必要な放電電流を流した時
に端子電圧が所定値を切るようになるまでの放電可能容
量である。 Ｖ＝Ｅ−ＲＩ…（１）2. Description of the Related Art In an electric vehicle or the like, there is a demand for a method of accurately estimating the remaining capacity in order to display the remaining capacity of a secondary battery used as a power source to prompt recharging. FIG. 7 shows an equivalent circuit of this secondary battery. An internal resistance R is located in series with the electromotive force E. Therefore,
The terminal voltage V of the secondary battery is expressed by the following equation (1), where I is the discharge current.
Indicated by The remaining capacity is a dischargeable capacity until the terminal voltage falls below a predetermined value when a necessary discharge current is passed. V = E-RI (1)
【０００３】そこで、例えば特開平８−１７９０１８号
公報には、二次電池の内部抵抗値を算出して、この内部
抵抗値より、残存容量が０と見做せる電池電圧（端子電
圧）Ｖ0 を得、これに基づいて残存容量を算出し表示す
る残存容量表示装置が提案されている。Therefore, for example, Japanese Patent Application Laid-Open No. Hei 8-179018 discloses that the internal resistance of a secondary battery is calculated, and from this internal resistance, the battery voltage (terminal voltage) V0 at which the remaining capacity can be regarded as 0 is calculated. A remaining capacity display device that calculates and displays the remaining capacity based on the obtained value has been proposed.
【０００４】[0004]
【発明が解決しようとする課題】ところで、上記内部抵
抗値は電池の劣化度（放電容量）に応じて大きくなるも
のの、どの程度大きくなるかは放電電流をどの程度流す
かによって変動する。ここにおいて、上記公報に記載さ
れた残存容量表示装置では、放電電流の履歴を考慮して
いないため、電気自動車等のように走行状態に応じて電
気負荷の大きさ、すなわち放電電流の大きさが変化する
ものでは、算出された残存容量に大きな誤差を生じるお
それがある。Although the internal resistance value increases in accordance with the degree of deterioration (discharge capacity) of the battery, how much the internal resistance value increases depends on how much discharge current flows. Here, in the remaining capacity display device described in the above publication, since the history of the discharge current is not taken into consideration, the magnitude of the electric load, that is, the magnitude of the discharge current depends on the traveling state as in an electric vehicle or the like. If it changes, a large error may occur in the calculated remaining capacity.
【０００５】そこで、本発明はこのような課題を解決す
るもので、二次電池を電気自動車等の動力源として使用
した場合にも正確にその残存容量を推定することができ
る二次電池の残存容量推定方法を提供することを目的と
する。Accordingly, the present invention is to solve such a problem, and it is possible to accurately estimate the remaining capacity of a secondary battery even when the secondary battery is used as a power source of an electric vehicle or the like. An object of the present invention is to provide a capacity estimation method.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するた
め、本発明では、二次電池の放電履歴から放電電流参考
値を求めるステップ（ステップ１０７〜１０９）と、放
電電流参考値をパラメータとして、放電容量の変化に対
する電池内部抵抗値の変化を求めるステップ（マップ
１）と、放電容量の変化に対する電池起電力の変化を求
めるステップ（マップ２）と、電池起電力の変化値か
ら、最大放電電流と電池内部抵抗値を乗じた値を引い
て、電池容量の変化に対する電池端子電圧の変化を求め
るステップ（マップ３，ステップ１１１）と、電池端子
電圧が所定電圧を切る時の放電容量を総容量として、当
該総容量に基づいて残存容量を推定するステップ（ステ
ップ１１３）とを具備している。In order to achieve the above object, according to the present invention, a step of obtaining a discharge current reference value from a discharge history of a secondary battery (steps 107 to 109), and using the discharge current reference value as a parameter, The step of determining the change in the battery internal resistance value with respect to the change in the discharge capacity (Map 1), the step of determining the change in the battery electromotive force with respect to the change in the discharge capacity (Map 2), and the maximum discharge current Subtracting the value obtained by multiplying the battery terminal voltage by the battery internal resistance value to determine the change in the battery terminal voltage with respect to the change in the battery capacity (map 3, step 111). (Step 113) for estimating the remaining capacity based on the total capacity.
【０００７】本発明においては、放電電流参考値をパラ
メータとして、放電容量の変化に対する電池内部抵抗値
の変化を求め、この電池内部抵抗値に基づき総容量を求
めるとともに残存容量を求めている。こりように、残存
容量の推定に、放電履歴に基づく放電電流参考値を使用
しているから、二次電池を電気自動車等の動力源として
使用した場合のように、放電電流が大きく変化する場合
にも正確にその残存容量を推定することができる。In the present invention, the change in the internal resistance of the battery with respect to the change in the discharge capacity is determined using the discharge current reference value as a parameter, and the total capacity and the remaining capacity are determined based on the internal resistance of the battery. As described above, since the discharge current reference value based on the discharge history is used for estimating the remaining capacity, when the discharge current greatly changes, such as when the secondary battery is used as a power source of an electric vehicle or the like. In addition, the remaining capacity can be accurately estimated.
【０００８】放電電流参考値としては、現在に至るまで
の放電電流の平均値を使用することができる。また、
「放電電流参考値をパラメータとして、放電容量の変化
に対する電池内部抵抗値の変化を求めるステップ」およ
び「放電容量の変化に対する電池起電力の変化を求める
ステップ」は、それぞれ予め実験値を得て、これらをマ
ップデータとして記憶しておく方法が採用できる。As the discharge current reference value, the average value of the discharge current up to the present can be used. Also,
`` Using the discharge current reference value as a parameter, a step of obtaining a change in the battery internal resistance value with respect to a change in the discharge capacity '' and a `` Step of obtaining a change in the battery electromotive force with respect to a change in the discharge capacity '' respectively obtain experimental values in advance A method of storing these as map data can be adopted.
【０００９】また、電池内部抵抗値を二次電池の温度に
応じて補正するようにすれば、さらに正確に残存容量を
推定することができる。Further, if the internal resistance value of the battery is corrected according to the temperature of the secondary battery, the remaining capacity can be more accurately estimated.
【００１０】本発明は以下の構成を有する装置としても
実現できる。すなわち、二次電池の残存容量推定装置
は、二次電池の放電履歴から放電電流参考値を求める手
段と、放電電流参考値をパラメータとして、放電容量の
変化に対する電池内部抵抗値の変化を記憶する手段と、
放電容量の変化に対する電池起電力の変化を記憶する手
段と、電池起電力の変化値から、最大放電電流と電池内
部抵抗値を乗じた値を引いて、放電容量の変化に対する
電池端子電圧の変化を求める手段と、電池端子電圧が所
定電圧を切る時の放電容量を総容量として、当該総容量
に基づいて残存容量を推定する手段とを具備している。The present invention can also be realized as an apparatus having the following configuration. That is, the device for estimating the remaining capacity of the secondary battery stores the means for calculating the discharge current reference value from the discharge history of the secondary battery, and stores the change in the battery internal resistance value with respect to the change in the discharge capacity using the discharge current reference value as a parameter. Means,
Means for storing a change in battery electromotive force with respect to a change in discharge capacity, and subtracting a value obtained by multiplying a maximum discharge current and a battery internal resistance value from a change in battery electromotive force to obtain a change in battery terminal voltage with respect to a change in discharge capacity. And means for estimating the remaining capacity based on the total capacity with the discharge capacity when the battery terminal voltage falls below a predetermined voltage as the total capacity.
【００００】[0000]
（第１実施形態）図１には本発明の方法を実行する装置
の全体構成を示す。二次電池１は複数の単電池が直列に
接続されて組電池となり、メインスイッチ２を介して電
気自動車のモータ等の電気負荷３へ接続され、これに放
電電流を供給する。なお、二次電池１は適宜充電器４に
接続されて充電される。充放電線Ｌには電流センサ５が
設けられて、その電流信号がＣＰＵおよびメモリ等を内
蔵する処理装置６に入力している。処理装置６には二次
電池の温度を検出する温度センサ７が接続されるととも
に、表示器８が接続されて、後述の処理により算出され
た二次電池１の残存容量が表示される。なお、電気負荷
３が上記モータ等である場合には回生電流によって二次
電池１が充電されることもある。(First Embodiment) FIG. 1 shows the overall configuration of an apparatus for executing the method of the present invention. The secondary battery 1 is composed of a plurality of cells connected in series to form an assembled battery, which is connected via a main switch 2 to an electric load 3 such as a motor of an electric vehicle, and supplies a discharge current thereto. In addition, the secondary battery 1 is appropriately connected to the charger 4 and charged. A current sensor 5 is provided on the charge / discharge line L, and its current signal is input to a processing device 6 including a CPU, a memory, and the like. A temperature sensor 7 for detecting the temperature of the secondary battery is connected to the processing device 6 and a display 8 is connected to display the remaining capacity of the secondary battery 1 calculated by a process described later. When the electric load 3 is the motor or the like, the secondary battery 1 may be charged by the regenerative current.
【００１１】図２には上記処理装置６内のＣＰＵで実行
される残存容量推定プログラムのフローチャートを示
す。図２（Ａ）の初期処理のステップ１０１で二次電池
１を満充電まで充電しておき、続くステップ１０２で
は、電流積算値Ｑｉ、放電電流積算値Ｑｄおよび放電時
間積算値ｔｄをリセットする。そして、ステップ１０３
で、放電電流参考値Ｉｍを標準値にセットする。この放
電電流参考値Ｉｍは本実施形態では後述のように放電電
流の平均値である。また、標準値とは、後述する通常ル
ーチンの１サイクル目で、検出電流Ｉが０の時に、求め
る総容量Ｑmax が公称容量となるような値で、例えば
０．２ＣＡである。FIG. 2 shows a flowchart of a remaining capacity estimating program executed by the CPU in the processing device 6. In step 101 of the initial process of FIG. 2A, the secondary battery 1 is charged to full charge, and in the following step 102, the integrated current value Qi, the integrated discharge current value Qd, and the integrated discharge time value td are reset. And step 103
Then, the discharge current reference value Im is set to a standard value. In this embodiment, the discharge current reference value Im is an average value of the discharge current as described later. The standard value is a value such that the total capacity Qmax to be obtained becomes the nominal capacity when the detected current I is 0 in the first cycle of a normal routine described later, for example, 0.2 CA.
【００１２】図２（Ｂ）の通常ルーチンは例えば０．１
秒程度のサイクル周期Δｔで繰り返し実行されるもの
で、ステップ１０４では、電流センサ５および温度セン
サ７からの信号により、充放電線Ｌを流れる電流Ｉと二
次電池１の温度Ｔを検出する。続いてステップ１０５で
は、それまでの電流積算値Ｑｉに本サイクル周期中の電
流積算値Ｉ＊Δｔを加えて新たな電流積算値Ｑｉとす
る。ステップ１０６で電流Ｉの正負を確認し、Ｉ＞０で
あれば放電電流が流れたものとしてステップ１０７以下
へ進む。Ｉ≦０の場合はステップ１１０へ進む。The normal routine shown in FIG.
In step 104, the current I flowing through the charging / discharging line L and the temperature T of the secondary battery 1 are detected based on signals from the current sensor 5 and the temperature sensor 7. Subsequently, at step 105, the current integrated value Qi up to that point is added to the current integrated value I * Δt during the present cycle to obtain a new current integrated value Qi. In step 106, whether the current I is positive or negative is checked. If I> 0, it is determined that the discharge current has flowed, and the process proceeds to step 107 and thereafter. If I ≦ 0, the process proceeds to step 110.
【００１３】ステップ１０７では、それまでの放電電流
積算値Ｑｄに上記電流積算値Ｉ＊Δｔを加えて新たな放
電電流積算値Ｑｄとし、続いて、それまでの放電時間積
算値ｔｄに本サイクル周期Δｔを加えて新たな放電時間
積算値ｔｄとする（ステップ１０８）。ステップ１０９
では放電電流参考値Ｉｍとして、全放電時間中の放電電
流の平均値Ｑｄ／ｔｄを求める。In step 107, the current integrated value I * .DELTA.t is added to the previous discharge current integrated value Qd to obtain a new discharge current integrated value Qd. At is added to make a new integrated discharge time value td (step 108). Step 109
Then, the average value Qd / td of the discharge current during the entire discharge time is obtained as the discharge current reference value Im.
【００１４】ステップ１１０では二次電池１の内部抵抗
変化率Ｋを式（２）で求める。すなわち、温度Ｔによる
二次電池１の内部抵抗Ｒの変化は、使用されている電解
質の温度依存性が支配的であり、内部抵抗Ｒと温度Ｔと
の間にはｌｏｇＲ＝ａ／Ｔ＋ｂ（ａ，ｂは実験的に求め
られる定数）の関係がある。したがって、基準温度Ｔｏ
の時の内部抵抗値をＲｏとして、上記内部抵抗変化率Ｋ
は式（２）のようになる。In step 110, the internal resistance change rate K of the secondary battery 1 is obtained by the equation (2). That is, the change in the internal resistance R of the secondary battery 1 due to the temperature T is dominantly dependent on the temperature of the electrolyte used, and logR = a / T + b (a) between the internal resistance R and the temperature T. , B are constants experimentally obtained). Therefore, the reference temperature To
The internal resistance value at the time of is defined as Ro, and the internal resistance change rate K
Is as shown in equation (2).
【００１５】 Ｋ＝Ｒ／Ｒｏ＝ｅｘｐ（ａ＊（１／Ｔ−１／Ｔｏ）…（２）K = R / Ro = exp (a * (1 / T−1 / To) (2)
【００１６】ここで、図３には放電容量の変化に伴う内
部抵抗値Ｒｏの変化を示す。図に示すように、内部抵抗
値Ｒｏは放電容量Ｑが増大すると非線形的に増大する
が、その増大の程度は放電電流参考値（本実施形態では
既述のように平均値）Ｉｍに依存している。すなわち、
放電電流参考値Ｉｍが小さい場合には内部抵抗値Ｒｏの
増大の程度は大きく、反対に、放電電流参考値Ｉｍが大
きい場合には内部抵抗値Ｒｏの増大の程度は小さくな
る。このように、内部抵抗値Ｒｏは放電容量Ｑに対する
その変化量が放電電流履歴に依存して異なっている。そ
こで、本実施形態では、図３の、Ｉｍをパラメータとす
る内部抵抗変化グラフをマップ１として処理装置６内の
メモリに予め記憶させている。FIG. 3 shows a change in the internal resistance Ro with a change in the discharge capacity. As shown in the figure, the internal resistance value Ro increases non-linearly as the discharge capacity Q increases. The degree of the increase depends on the discharge current reference value (the average value as described above in the present embodiment) Im. ing. That is,
When the discharge current reference value Im is small, the degree of increase in the internal resistance value Ro is large. Conversely, when the discharge current reference value Im is large, the degree of increase in the internal resistance value Ro is small. As described above, the amount of change in the internal resistance value Ro with respect to the discharge capacity Q differs depending on the discharge current history. Therefore, in the present embodiment, the internal resistance change graph of FIG. 3 using Im as a parameter is stored in the memory of the processing device 6 as Map 1 in advance.
【００１７】一方、二次電池１の起電力Ｅは図４に示す
ように、放電容量Ｑの増大に伴って非線形的に下降す
る。そこで、本実施形態では、図４の起電力変化グラフ
をマップ２として処理装置６内のメモリに予め記憶させ
ている。そこで、図２のステップ１１１では、上記マッ
プ１とマップ２から式（３）を使用して、図５に示すよ
うな、放電容量Ｑに対する端子電圧Ｖの変化グラフをマ
ップ３として算出する。なお、式（３）におけるＩmax
は、電気負荷３が要求する最大の放電電流である。On the other hand, as shown in FIG. 4, the electromotive force E of the secondary battery 1 decreases nonlinearly as the discharge capacity Q increases. Therefore, in the present embodiment, the electromotive force change graph of FIG. 4 is stored in the memory of the processing device 6 in advance as the map 2. Therefore, in step 111 of FIG. 2, a change graph of the terminal voltage V with respect to the discharge capacity Q as shown in FIG. Note that Imax in equation (3)
Is the maximum discharge current required by the electric load 3.
【００１８】 Ｖ（Ｑ）＝Ｅ（Ｑ）−Ｋ＊Ｒｏ（Ｑ）＊Ｉmax …（３）V (Q) = E (Q) −K * Ro (Q) * Imax (3)
【００１９】ステップ１１２では、上記マップ３（図
５）から、放電電流Ｉmax を維持した時の、端子電圧Ｖ
が放電終止電圧Ｖend まで低下する時の放電容量Ｑを推
定し、これを二次電池の総容量Ｑmax とする。そして、
ステップ１１３で、式（４）により、総容量Ｑmax から
電流積算値Ｑｉを引いて残存容量Ｑｒとし、これを表示
器８上に表示する。In step 112, from the map 3 (FIG. 5), the terminal voltage V when the discharge current Imax is maintained.
Is estimated when the discharge voltage drops to the discharge end voltage Vend, and this is assumed to be the total capacity Qmax of the secondary battery. And
In step 113, the current integrated value Qi is subtracted from the total capacity Qmax according to the equation (4) to obtain a remaining capacity Qr, which is displayed on the display 8.
【００２０】Ｑｒ＝Ｑmax −Ｑｉ…（４）Qr = Qmax-Qi (4)
【００２１】（第２実施形態）上記第１実施形態では、
残存容量推定プログラムの実行開始から現在に至るまで
の平均放電電流Ｑｄ／ｔｄを放電電流参考値Ｉｍとして
使用したが、本実施形態では、現在に至るまでの最新の
所定数の放電電流の平均値を放電電流参考値Ｉｍとして
使用する。本実施形態における残存容量推定プログラム
は、図２（Ａ）のステップ１０２，１０３に代えて、図
６（Ａ）のステップ２０１，２０２を使用し、また、図
６（Ｂ）のステップ１０７〜１０９に代えて、図６
（Ｂ）のステップ２０３〜２０９を使用する。他のステ
ップは第１実施形態と同様である。(Second Embodiment) In the first embodiment,
Although the average discharge current Qd / td from the start of execution of the remaining capacity estimation program to the present is used as the discharge current reference value Im, in the present embodiment, the average value of the latest predetermined number of discharge currents up to the present is obtained. Is used as a discharge current reference value Im. The remaining capacity estimation program according to the present embodiment uses steps 201 and 202 in FIG. 6A instead of steps 102 and 103 in FIG. 2A, and further includes steps 107 to 109 in FIG. Instead of FIG.
Steps 203 to 209 of (B) are used. Other steps are the same as in the first embodiment.
【００２２】すなわち、図６（Ａ）の初期処理におい
て、二次電池１を満充電にした後、ステップ２０１で電
流積算値Ｑｉおよび放電電流サンプル数ｎｄをリセット
し、続くステップ２０２で放電電流参考値Ｉｍを第１実
施形態におけると同様の標準値にセットする。図６
（Ｂ）に示す通常ルーチン中のステップ２０３では、放
電電流サンプル数ｎｄをインクリメントし、続くステッ
プ２０４で本サイクルでサンプルされた放電電流ＩをＩ
0 として記憶する。ステップ２０５で放電電流サンプル
数ｎｄがＭより大きいか否かを確認し、ｎｄ＞Ｍであれ
ばステップ２０６で、最新の（Ｍ＋１）回の各サイクル
中にサンプルされた放電電流の平均値を式（５）より算
出して、これを放電電流参考値Ｉｍとする。ステップ２
０７では、最も古い（Ｍ＋１）サイクル前の放電電流デ
ータＩM を捨てて、ＩM-1 〜Ｉ0 の各放電電流データを
順次繰り上げる。That is, in the initial processing of FIG. 6A, after the secondary battery 1 is fully charged, the integrated current value Qi and the number of discharge current samples nd are reset in step 201, and the discharge current is referred to in subsequent step 202. The value Im is set to the same standard value as in the first embodiment. FIG.
In step 203 of the normal routine shown in FIG. 3B, the discharge current sample number nd is incremented, and in step 204, the discharge current I sampled in this cycle is increased by I.
Store as 0. In step 205, it is checked whether or not the number nd of discharge current samples is larger than M. If nd> M, in step 206, the average value of the discharge current sampled in each of the latest (M + 1) cycles is calculated by the following equation. This is calculated from (5), and is set as a discharge current reference value Im. Step 2
At 07, the oldest (M + 1) cycle previous discharge current data IM is discarded, and the discharge current data of IM-1 to I0 is sequentially carried forward.
【００２３】[0023]
【数１】 (Equation 1)
【００２４】上記ステップ２０５で、通常ルーチンが開
始されてから十分時間がたっておらず、ｎｄ≦Ｍである
場合には、最新のｎｄ回の各サイクル中にサンプルされ
た各放電電流の平均値を式（６）より算出して、これを
放電電流参考値Ｉｍとする（ステップ２０８）。そし
て、ステップ２０９では、Ｉnd-1〜Ｉ0 の各放電電流デ
ータを順次繰り上げる。In step 205, if not enough time has elapsed since the start of the normal routine and if nd ≦ M, the average value of the discharge currents sampled during each of the latest nd cycles is calculated. This is calculated from equation (6), and is set as a discharge current reference value Im (step 208). Then, in step 209, the discharge current data of Ind-1 to I0 are sequentially carried up.
【００２５】[0025]
【数２】 (Equation 2)
【００２６】このようにして、通常は、最新の（Ｍ＋
１）個の放電電流の平均値が放電電流参考値Ｉｍとして
使用されるから、最新の放電電流履歴に基づいて二次電
池１の残存容量をより正確に推定することができる。In this way, the latest (M +
1) Since the average value of the discharge currents is used as the discharge current reference value Im, the remaining capacity of the secondary battery 1 can be more accurately estimated based on the latest discharge current history.
【００２７】なお、上記各実施形態では、放電電流参考
値Ｉｍとして平均値を使用したが、放電電流履歴を良く
示すものであれば他の指標値を使用することができる。In the above embodiments, the average value is used as the discharge current reference value Im, but any other index value can be used as long as it shows the discharge current history well.
【００２８】[0028]
【発明の効果】以上のように、本発明の二次電池の残存
容量推定方法によれば、二次電池を放電電流の変動が大
きい電気自動車等の動力源として使用した場合にも正確
にその残存容量を推定することができるAs described above, according to the method for estimating the state of charge of a secondary battery of the present invention, even when the secondary battery is used as a power source of an electric vehicle or the like having a large variation in discharge current, the method can be used accurately. Remaining capacity can be estimated
【図１】本発明の方法を実施する装置の全体ブロック構
成図である。FIG. 1 is an overall block diagram of an apparatus for implementing a method of the present invention.
【図２】本発明の第１実施形態における、処理装置内の
ＣＰＵで実行される残存容量推定プログラムのフローチ
ャートである。FIG. 2 is a flowchart of a remaining capacity estimation program executed by a CPU in the processing device according to the first embodiment of the present invention.
【図３】内部抵抗値の変化を示すグラフである。FIG. 3 is a graph showing a change in an internal resistance value.
【図４】起電力の変化を示すグラフである。FIG. 4 is a graph showing a change in electromotive force.
【図５】端子電圧の変化を示すグラフである。FIG. 5 is a graph showing a change in terminal voltage.
【図６】本発明の第２実施形態における、処理装置内の
ＣＰＵで実行される残存容量推定プログラムの部分的フ
ローチャートである。FIG. 6 is a partial flowchart of a remaining capacity estimation program executed by a CPU in a processing device according to a second embodiment of the present invention.
【図７】二次電池の等価回路である。FIG. 7 is an equivalent circuit of a secondary battery.
１…二次電池、３…電気負荷、５…電流センサ、６…処
理装置、７…温度センサ。DESCRIPTION OF SYMBOLS 1 ... Secondary battery, 3 ... Electrical load, 5 ... Current sensor, 6 ... Processing device, 7 ... Temperature sensor.
Claims (1)
を求めるステップと、 放電電流参考値をパラメータとして、放電容量の変化に
対する電池内部抵抗値の変化を求めるステップと、 放電容量の変化に対する電池起電力の変化を求めるステ
ップと、 電池起電力の変化値から、最大放電電流と電池内部抵抗
値を乗じた値を引いて、電池容量の変化に対する電池端
子電圧の変化を求めるステップと、 電池端子電圧が所定電圧を切る時の放電容量を総容量と
して、当該総容量に基づいて残存容量を推定するステッ
プとを具備する二次電池の残存容量推定方法。A step of obtaining a discharge current reference value from a discharge history of the secondary battery; a step of obtaining a change in battery internal resistance value with respect to a change in discharge capacity using the discharge current reference value as a parameter; Calculating a change in battery electromotive force; subtracting a value obtained by multiplying a maximum discharge current and a battery internal resistance value from a change value of the battery electromotive force to obtain a change in battery terminal voltage with respect to a change in battery capacity; Estimating the remaining capacity based on the total capacity using the discharge capacity when the terminal voltage falls below a predetermined voltage as a total capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9209726A JPH1138107A (en) | 1997-07-19 | 1997-07-19 | Method for estimating residual capacity of secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9209726A JPH1138107A (en) | 1997-07-19 | 1997-07-19 | Method for estimating residual capacity of secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1138107A true JPH1138107A (en) | 1999-02-12 |
Family
ID=16577633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9209726A Pending JPH1138107A (en) | 1997-07-19 | 1997-07-19 | Method for estimating residual capacity of secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1138107A (en) |
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|---|---|---|---|---|
| WO2005015252A1 (en) * | 2003-06-27 | 2005-02-17 | The Furukawa Electric Co., Ltd. | Method for judging deterioration of accumulator, method for measuring secondary cell internal impedance, device for measuring secondary cell internal impedance, device for judging deterioration of secondary cell, and power source system |
| US6920404B2 (en) | 2000-09-28 | 2005-07-19 | Japan Storage Battery Co., Ltd. | Method of detecting residual capacity of secondary battery |
| WO2007032382A1 (en) * | 2005-09-16 | 2007-03-22 | The Furukawa Electric Co., Ltd | Secondary cell degradation judgment method, secondary cell degradation judgment device, and power supply system |
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| JP2011515652A (en) * | 2008-01-11 | 2011-05-19 | エスケー エナジー カンパニー リミテッド | Method and apparatus for measuring SOC of battery in battery management system |
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-
1997
- 1997-07-19 JP JP9209726A patent/JPH1138107A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6920404B2 (en) | 2000-09-28 | 2005-07-19 | Japan Storage Battery Co., Ltd. | Method of detecting residual capacity of secondary battery |
| US7616003B2 (en) | 2003-06-27 | 2009-11-10 | The Furukawa Electric Co., Ltd. | Method for determining deterioration of accumulator battery, method for measuring internal impedance of secondary battery, equipment for measuring internal impedance of secondary battery, equipment for determining deterioration of secondary battery, and power supply system |
| WO2005015252A1 (en) * | 2003-06-27 | 2005-02-17 | The Furukawa Electric Co., Ltd. | Method for judging deterioration of accumulator, method for measuring secondary cell internal impedance, device for measuring secondary cell internal impedance, device for judging deterioration of secondary cell, and power source system |
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| WO2007032382A1 (en) * | 2005-09-16 | 2007-03-22 | The Furukawa Electric Co., Ltd | Secondary cell degradation judgment method, secondary cell degradation judgment device, and power supply system |
| JP2011515652A (en) * | 2008-01-11 | 2011-05-19 | エスケー エナジー カンパニー リミテッド | Method and apparatus for measuring SOC of battery in battery management system |
| JP2009202668A (en) * | 2008-02-26 | 2009-09-10 | Furukawa Electric Co Ltd:The | Battery state detection sensor device |
| CN103257323A (en) * | 2013-06-03 | 2013-08-21 | 清华大学 | Method for estimating lithium ion battery remaining available capacity |
| JP2018186101A (en) * | 2015-07-02 | 2018-11-22 | 日立オートモティブシステムズ株式会社 | Battery control device and battery pack |
| US10680453B2 (en) | 2015-07-02 | 2020-06-09 | Hitachi Automotive Systems, Ltd. | Battery control device |
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