JP2000270488A - Overdischarging preventer of battery pack - Google Patents
Overdischarging preventer of battery packInfo
- Publication number
- JP2000270488A JP2000270488A JP11067961A JP6796199A JP2000270488A JP 2000270488 A JP2000270488 A JP 2000270488A JP 11067961 A JP11067961 A JP 11067961A JP 6796199 A JP6796199 A JP 6796199A JP 2000270488 A JP2000270488 A JP 2000270488A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- voltage
- overdischarge
- battery pack
- prevention device
- 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
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)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、集合電池の過放電
防止装置に関し、詳しくは、複数の電池モジュールを直
列に接続してなる集合電池の過放電を防止する過放電防
止装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing overdischarge of an assembled battery, and more particularly to an apparatus for preventing overdischarge of an assembled battery formed by connecting a plurality of battery modules in series.
【０００２】[0002]
【従来の技術】従来、この種の集合電池の過放電防止装
置としては、集合電池の放電電流から過放電に対する閾
値電圧を設定し、集合電池を構成する各電池のうちの最
小の電圧と設定した閾値電圧とに基づいて集合電池の過
放電を判定するものが提案されている（例えば、特開平
１０−２５７６０５号公報など）。この装置は、集合電
池の放電電流の大きさに応じて集合電池の放電終止電圧
が変化することに基づいて集合電池の過放電を判定して
いる。2. Description of the Related Art Conventionally, as a device for preventing overdischarge of this type of battery pack, a threshold voltage for overdischarge is set from the discharge current of the battery pack, and the minimum voltage of each battery constituting the battery pack is set. One that determines overdischarge of a battery pack based on the threshold voltage thus obtained has been proposed (for example, Japanese Patent Application Laid-Open No. H10-257605). This device determines overdischarge of the battery pack based on the change in the discharge end voltage of the battery pack according to the magnitude of the discharge current of the battery pack.
【０００３】集合電池の過放電を防止するものではない
が、バッテリの放電電圧の変化率からバッテリの容量を
推定する装置も提案されている（例えば、特開平８−１
３６６２９号公報など）。この装置は、バッテリの容量
が放電開始後のある一定時間内における電圧の変化率に
高い相関を有することに基づいてバッテリの容量を推定
している。[0003] An apparatus for estimating the capacity of a battery from the rate of change of the discharge voltage of the battery is not proposed to prevent overdischarge of the assembled battery (for example, Japanese Patent Application Laid-Open No. Hei 8-1).
36629). This device estimates the capacity of a battery based on the fact that the capacity of the battery has a high correlation with the rate of change of the voltage within a certain period of time after the start of discharging.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、集合電
池の放電電流に基づいて集合電池の過放電を判定するも
のでは、より正確性を求めるために複数回判定を行なう
必要があり、その間に集合電池が過放電になってしまう
場合を生じるという問題があった。また、集合電池の過
放電を判定しても対応をとるまでに時間を要し、判定は
できても結果として過放電させてしまうという問題もあ
った。この問題は、バッテリの放電電圧の変化率からバ
ッテリの容量を推定するものを用いてバッテリの過放電
を判定するものも同様である。However, in the case of judging overdischarge of the battery pack based on the discharge current of the battery pack, it is necessary to make a plurality of determinations in order to obtain more accuracy, during which the battery pack is determined. However, there has been a problem that overdischarge may occur. Further, there is also a problem that it takes time to take measures even if the overdischarge of the assembled battery is determined, and even if the determination can be made, the overdischarge is caused as a result. This problem is the same in the case of determining the overdischarge of the battery using the one that estimates the capacity of the battery from the change rate of the discharge voltage of the battery.
【０００５】本発明の集合電池の過放電防止装置は、集
合電池の過放電を防止することを目的の一つとする。ま
た、本発明の集合電池の過放電防止装置は、集合電池の
過放電をより正確に予測することを目的の一つとする。An object of the present invention is to prevent overdischarge of an assembled battery. Another object of the present invention is to provide an apparatus for preventing overdischarge of a battery pack that more accurately predicts overdischarge of the battery pack.
【０００６】[0006]
【課題を解決するための手段およびその作用・効果】本
発明の集合電池の過放電防止装置は、上述の目的の少な
くとも一部を達成するために以下の手段を採った。Means for Solving the Problems and Actions and Effects Thereof The overdischarge prevention apparatus for an assembled battery of the present invention employs the following means in order to achieve at least a part of the above object.
【０００７】本発明の集合電池の過放電防止装置は、複
数の電池モジュールを直列に接続してなる集合電池の過
放電を防止する過放電防止装置であって、前記複数の電
池モジュールの各電圧を検出する電池モジュール電圧検
出手段と、該検出された各電圧の変化率を演算する変化
率演算手段と、該演算された各電圧の変化率と前記電圧
検出手段により検出された前記各電圧とに基づいて前記
集合電池の過放電を予測する過放電予測手段とを備える
ことを要旨とする。[0007] An overdischarge prevention device for an assembled battery according to the present invention is an overdischarge prevention device for preventing overdischarge of an assembled battery comprising a plurality of battery modules connected in series. A battery module voltage detecting means for detecting the change rate of each detected voltage, a change rate calculating means for calculating a change rate of each of the detected voltages, and the respective change rates of the respective calculated voltages and the respective voltages detected by the voltage detecting means. And an overdischarge predicting means for predicting overdischarge of the assembled battery based on
【０００８】この本発明の集合電池の過放電防止装置で
は、複数の電池モジュールの各電圧と各電圧の変化率と
に基づいて集合電池の過放電を予測するから、実際に集
合電池が過放電するまでに種々の対応をとることができ
る。ここで、「電池モジュール」は、一つ以上の電池を
直列に接続して構成されるものを意味し、複数の電池を
直列に接続するものは勿論、一つの電池そのものも含ま
れる。In the overdischarge prevention device for an assembled battery according to the present invention, the overdischarge of the assembled battery is predicted based on each voltage of the plurality of battery modules and the rate of change of each voltage. Various actions can be taken by the time. Here, the “battery module” means a module configured by connecting one or more batteries in series, and includes one battery itself as well as a module in which a plurality of batteries are connected in series.
【０００９】こうした本発明の集合電池の過放電防止装
置において、前記過放電予測手段は、前記変化率演算手
段により演算された前記各電圧の変化率に基づいて閾値
を設定する閾値設定手段を備え、前記各電圧のうちいず
れかが前記閾値設定手段により設定された閾値を下回る
ときに前記集合電池の過放電を予測する手段であるもの
とすることもできる。こうすれば、集合電池の過放電ま
での予測はより正確なものとすることができる。この態
様の本発明の集合電池の過放電防止装置において、前記
閾値設定手段は、前記各電圧の変化率のうち最も変化の
大きな値に基づいて閾値を設定する手段であるものとす
ることもできる。こうすれば、最も変化の大きな電池モ
ジュールの過放電を防止することができる。In the apparatus for preventing overdischarge of an assembled battery according to the present invention, the overdischarge predicting means includes threshold setting means for setting a threshold based on the rate of change of each of the voltages calculated by the rate of change calculating means. In addition, when any one of the voltages falls below a threshold set by the threshold setting unit, the unit may predict the overdischarge of the battery pack. In this way, the prediction up to the overdischarge of the assembled battery can be made more accurate. In the overdischarge prevention device for an assembled battery according to the aspect of the present invention, the threshold value setting unit may be a unit that sets a threshold value based on a value of the largest change in the rate of change of each voltage. . By doing so, it is possible to prevent overdischarge of the battery module having the largest change.
【００１０】また、本発明の集合電池の過放電防止装置
において、前記集合電池の電圧を検出する集合電池電圧
検出手段を備え、前記過放電予測手段は、前記集合電池
電圧検出手段により検出された前記集合電池の電圧が所
定値未満のとき、前記集合電池の過放電の予測を行なう
手段であるものとすることもできる。こうすれば、集合
電池の過放電の予測が必要なときにのみ予測するものと
することができる。[0010] Further, in the apparatus for preventing overdischarge of an assembled battery according to the present invention, there is provided an assembled battery voltage detecting means for detecting a voltage of the assembled battery, and the overdischarge predicting means is detected by the assembled battery voltage detecting means. When the voltage of the battery pack is lower than a predetermined value, the battery pack may be a means for predicting overdischarge of the battery pack. In this way, the prediction can be made only when it is necessary to predict the overdischarge of the assembled battery.
【００１１】さらに、本発明の集合電池の過放電防止装
置において、前記集合電池から電力ラインに設けられ該
集合電池からの電力の供給を停止可能な電力停止手段
と、前記過放電予測手段により前記集合電池の過放電が
予測されたとき、前記電力停止手段により前記集合電池
からの電力の供給を停止するよう該電力停止手段を駆動
制御する過放電制御手段とを備えるものとすることもで
きる。こうすれば、より確実に集合電池の過放電を防止
することができる。In the overdischarge prevention device for a battery pack according to the present invention, the power supply stopping means provided on the power line from the battery pack and capable of stopping the supply of power from the battery pack, and the overdischarge prediction means, An overdischarge control means for controlling the power stop means so as to stop the supply of power from the collective battery by the power stop means when overdischarge of the battery pack is predicted. This makes it possible to more reliably prevent overdischarge of the assembled battery.
【００１２】[0012]
【発明の実施の形態】次に、本発明の実施の形態を実施
例を用いて説明する。図１は、本発明の一実施例である
過放電防止装置２０を負荷４０に接続した状態の構成の
一例を示す構成図である。図示するように、実施例の過
放電防止装置２０は、複数の電池２３を直列に接続して
構成される集合電池２２と、集合電池２２の電圧Ｖｂを
検出すると共に各電池２３の電圧Ｖｎを検出する電圧検
出器２４と、集合電池２２からの電力ラインに設けられ
負荷４０への電力の供給および供給の停止を行なうリレ
ー２６，２８と、過放電防止装置２０全体をコントロー
ルする電子制御ユニット３０とを備える。Next, embodiments of the present invention will be described with reference to examples. FIG. 1 is a configuration diagram illustrating an example of a configuration in a state where an overdischarge prevention device 20 according to an embodiment of the present invention is connected to a load 40. As shown in the drawing, the overdischarge prevention device 20 of the embodiment detects an assembled battery 22 configured by connecting a plurality of batteries 23 in series, a voltage Vb of the assembled battery 22 and a voltage Vn of each battery 23. A voltage detector 24 for detection, relays 26 and 28 provided on a power line from the assembled battery 22 for supplying and stopping power to a load 40, and an electronic control unit 30 for controlling the entire overdischarge prevention device 20 And
【００１３】電圧検出器２４は、実施例では集合電池２
２全体の電圧Ｖｂを検出する電圧計と各電池２３の電圧
Ｖｎを検出する電池２３と同数の電圧計とを備え、同時
にすべての電圧Ｖｂ，Ｖｎを検出できるものとしたが、
一つあるいは複数個の電圧計を用いて接点を切り換えて
集合電池２２の電圧Ｖｂや各電池２３の電圧Ｖｎを検出
するものとしてもよい。In the embodiment, the voltage detector 24 is a
2, a voltmeter for detecting the entire voltage Vb and the same number of voltmeters as the battery 23 for detecting the voltage Vn of each battery 23 are provided, and all the voltages Vb and Vn can be simultaneously detected.
The voltage Vb of the assembled battery 22 and the voltage Vn of each battery 23 may be detected by switching the contacts using one or a plurality of voltmeters.
【００１４】リレー２６，２８は、図中では独立した二
つのものとして記載したが、実際は、同一箇所に一体の
ものとして構成されており、そのオンオフも一体のもの
として行なわれる。Although the relays 26 and 28 are described as two independent relays in the drawing, they are actually configured integrally at the same location, and the relays 26 and 28 are also integrally turned on and off.
【００１５】電子制御ユニット３０は、ＣＰＵ３２を中
心として構成されたワンチップマイクロプロセッサとし
て構成されており、処理プログラムを記憶したＲＯＭ３
４と、一時的にデータを記憶するＲＡＭ３６と、入出力
ポート（図示せず）とを備える。この電子制御ユニット
３０には、電圧検出器２４により検出される集合電池２
２の電圧Ｖｂや各電池２３の電圧Ｖｎが入力ポートを介
して入力されている。また、電子制御ユニット３０から
は、リレー２６，２８のアクチュエータ２７，２９への
駆動信号が出力ポートを介して出力されている。The electronic control unit 30 is constructed as a one-chip microprocessor composed mainly of a CPU 32, and has a ROM 3 storing a processing program.
4, a RAM 36 for temporarily storing data, and an input / output port (not shown). The electronic control unit 30 includes the assembled battery 2 detected by the voltage detector 24.
2 and the voltage Vn of each battery 23 are input via the input port. The electronic control unit 30 outputs drive signals to the actuators 27 and 29 of the relays 26 and 28 via output ports.
【００１６】こうして構成された実施例の過放電防止装
置２０は、次のように動作する。図２は、電子制御ユニ
ット３０により実行される過放電防止処理ルーチンの一
例を示すフローチャートである。このルーチンは、集合
電池２２から負荷４０への電力の供給が開始された直後
から所定時間毎（例えば、８ｍｓ毎）に繰り返し実行さ
れる。本ルーチンが実行されると、電子制御ユニット３
０のＣＰＵ３２は、まず電圧検出器２４により検出され
る集合電池２２の電圧Ｖｂを読み込み（ステップＳ１０
０）、読み込んだ電圧Ｖｂを閾値Ｖαと比較する（ステ
ップＳ１０２）。閾値Ｖαは、集合電池２２を構成する
電池２３のいずれかが過放電となる際の集合電池２２の
電圧より余裕をもって大きな値として設定されるもので
あり、集合電池２２の電圧Ｖｂがこの値より大きいとき
には過放電を考慮しなくてもよいと判断するためのもの
である。したがって、電圧Ｖｂが閾値Ｖα以上のときに
は、過放電は予測される可能性はないと判断して本ルー
チンを終了する。The overdischarge prevention device 20 of the embodiment configured as described above operates as follows. FIG. 2 is a flowchart illustrating an example of an overdischarge prevention processing routine executed by the electronic control unit 30. This routine is repeatedly executed every predetermined time (for example, every 8 ms) immediately after the supply of power from the battery pack 22 to the load 40 is started. When this routine is executed, the electronic control unit 3
0 first reads the voltage Vb of the battery pack 22 detected by the voltage detector 24 (step S10).
0), the read voltage Vb is compared with a threshold value Vα (step S102). The threshold value Vα is set as a value larger than the voltage of the battery pack 22 when any of the batteries 23 constituting the battery pack 22 is overdischarged, and the voltage Vb of the battery pack 22 is higher than this value. When it is large, it is for judging that it is not necessary to consider overdischarge. Therefore, when the voltage Vb is equal to or higher than the threshold value Vα, it is determined that there is no possibility that the overdischarge is predicted, and the routine ends.
【００１７】集合電池２２の電圧Ｖｂが閾値Ｖα未満の
ときには、過放電の予測の可能性があると判断し、以下
の処理を行なう。まず、電圧検出器２４により検出され
る各電池２３の電圧Ｖｎを読み込み（ステップＳ１０
４）、読み込んだ電圧Ｖｎのうちの最小値を最低電圧Ｖ
ｍｉｎとして抽出する（ステップＳ１０６）。そして、
読み込んだ各電池２３の電圧Ｖｎのそれぞれの降下率ｄ
Ｖｎを次式（１）により演算する（ステップＳ１０
８）。ここで、前回Ｖｎは、前回この過放電防止処理ル
ーチンが起動されたときにステップＳ１０４の処理で読
み込んだ各電池２３の電圧Ｖｎであり、Δｔは、この過
放電防止処理ルーチンが起動される時間間隔である。し
たがって、電圧の降下率ｄＶｎは、Δｔを無限小とすれ
ば電圧の変化率にマイナス１を乗じたものとなる。When the voltage Vb of the battery pack 22 is less than the threshold value Vα, it is determined that there is a possibility of overdischarge, and the following processing is performed. First, the voltage Vn of each battery 23 detected by the voltage detector 24 is read (step S10).
4), the minimum value of the read voltages Vn is
It is extracted as min (step S106). And
Drop rate d of each voltage Vn of each read battery 23
Vn is calculated by the following equation (1) (Step S10)
8). Here, the last time Vn is the voltage Vn of each battery 23 read in the processing of step S104 when the overdischarge prevention processing routine was started last time, and Δt is the time when this overdischarge prevention processing routine is started. The interval. Therefore, the voltage drop rate dVn is obtained by multiplying the voltage change rate by -1 if Δt is infinitely small.
【００１８】 ｄＶｎ＝（前回Ｖｎ−Ｖｎ）／Δｔ （１）DVn = (previous Vn−Vn) / Δt (1)
【００１９】こうして演算された各電圧の降下率ｄＶｎ
のうちの最大値を最大降下率ｄＶｍａｘとして抽出し
（ステップＳ１１０）、抽出した最大降下率ｄＶｍａｘ
に基づいて閾値Ｖβを設定する（ステップＳ１１２）。
閾値Ｖβは、その値未満の電圧の電池が最大降下率ｄＶ
ｍａｘで電圧降下すると所定時間以内にその電池が過放
電になるのを予測するための値として設定されるもので
あり、電池２３の特性や本ルーチンの起動間隔などによ
って定められるものである。実施例では、実験により最
大降下率ｄＶｍａｘと閾値Ｖβとの関係を求め、これを
マップとして予めＲＯＭ３４に記憶させておき、最大降
下率ｄＶｍａｘが与えられるとそれに対応する閾値Ｖβ
が導出されるものとした。なお、最大降下率ｄＶｍａｘ
と閾値Ｖβとの関係の一例を示すマップを図３に示す。The drop rate dVn of each voltage calculated in this manner.
Is extracted as the maximum descent rate dVmax (step S110), and the extracted maximum descent rate dVmax is extracted.
Is set based on the threshold value (step S112).
The threshold value Vβ is the maximum drop rate dV
The value is set as a value for predicting that the battery will be overdischarged within a predetermined time when the voltage drops by max, and is determined by the characteristics of the battery 23, the start interval of this routine, and the like. In the embodiment, the relationship between the maximum descent rate dVmax and the threshold value Vβ is obtained by an experiment, and this is stored in advance in the ROM 34 as a map, and when the maximum descent rate dVmax is given, the corresponding threshold value Vβ
Is derived. The maximum descent rate dVmax
FIG. 3 shows a map showing an example of the relationship between the threshold value and the threshold value Vβ.
【００２０】そして、ステップＳ１０６の処理で抽出し
た最低電圧Ｖｍｉｎと導出した閾値Ｖβを比較する（ス
テップＳ１１４）。最低電圧Ｖｍｉｎが閾値Ｖβ未満の
ときには、集合電池２２を構成する電池２３のいずれか
に過放電が予測されると判断し、電子制御ユニット３０
の出力ポートからリレー２６，２８のアクチュエータ２
７，２９にリレーを解除（オフ）する駆動信号を出力し
て集合電池２２から負荷４０への電力の供給を停止し
（ステップＳ１１６）、本ルーチンを終了する。一方、
最低電圧Ｖｍｉｎが閾値Ｖβ以上のときには、まだいず
れの電池２３に対しても過放電は予測されないと判断し
本ルーチンを終了する。Then, the minimum voltage Vmin extracted in the process of step S106 is compared with the derived threshold value Vβ (step S114). When the minimum voltage Vmin is lower than the threshold value Vβ, it is determined that overdischarge is predicted in any one of the batteries 23 constituting the assembled battery 22, and the electronic control unit 30
Actuator 2 of relay 26, 28 from output port of
A drive signal for releasing (turning off) the relay is output to 7, 29, and the supply of power from the battery pack 22 to the load 40 is stopped (step S116), and the present routine ends. on the other hand,
When the minimum voltage Vmin is equal to or higher than the threshold value Vβ, it is determined that overdischarge is not yet predicted for any of the batteries 23, and this routine ends.
【００２１】以上説明した実施例の過放電防止装置２０
によれば、集合電池２２を構成する各電池２３の電圧Ｖ
ｎとその降下率とに基づいて過放電を予測することがで
きる。しかも、各電池２３の電圧Ｖｎの最低電圧Ｖｍｉ
ｎと各電池２３の電圧Ｖｎの最大降下率ｄＶｍａｘとに
より過放電の予測を判定するから、集合電池２２を構成
する各電池２３のいずれもが過放電となることはなく、
過放電の防止に対する信頼性を向上させることができ
る。また、実施例の過放電防止装置２０によれば、過放
電が予測されたときには、負荷４０への電力の供給を直
ちに停止するから、それを放置することにより各電池２
３のいずれかが過放電となることを防止することができ
る。さらに、実施例の過放電防止装置２０によれば、集
合電池２２の電圧Ｖｂが過放電を考慮しなくてもよい電
圧（閾値Ｖα）未満のときだけ過放電の予測を行なうか
ら、無駄な演算などのためにＣＰＵ３２を占有するのを
防止することができる。この結果、過放電防止処理ルー
チンが所定時間毎に割り込みにより行なわれ、電子制御
ユニット３０が他の装置の制御なども行なうものとした
ときに他の装置の制御をも効率よく行なうことができ
る。The overdischarge prevention device 20 of the embodiment described above
According to the above, the voltage V of each battery 23 constituting the assembled battery 22
Overdischarge can be predicted based on n and the rate of its fall. In addition, the minimum voltage Vmi of the voltage Vn of each battery 23
Since the prediction of overdischarge is determined based on n and the maximum drop rate dVmax of the voltage Vn of each battery 23, none of the batteries 23 constituting the assembled battery 22 is overdischarged.
The reliability for preventing overdischarge can be improved. Further, according to the over-discharge prevention device 20 of the embodiment, when over-discharge is predicted, the supply of power to the load 40 is immediately stopped.
3 can be prevented from being over-discharged. Furthermore, according to the overdischarge prevention device 20 of the embodiment, the overdischarge is predicted only when the voltage Vb of the assembled battery 22 is lower than the voltage (threshold value Vα) that does not need to consider the overdischarge. Occupation of the CPU 32 for such reasons can be prevented. As a result, the overdischarge prevention processing routine is performed by interruption every predetermined time, and when the electronic control unit 30 also controls other devices, control of other devices can be performed efficiently.
【００２２】実施例の過放電防止装置２０では、最低電
圧Ｖｍｉｎを抽出した後に最大降下率ｄＶｍａｘを求め
て閾値Ｖβを設定したが、その順序は限定されるもので
なく、最大降下率ｄＶｍａｘを求めて閾値Ｖβを設定し
た後に最低電圧Ｖｍｉｎを抽出してもよく、あるいは、
最低電圧Ｖｍｉｎを抽出する処理と最大降下率ｄＶｍａ
ｘを求めて閾値Ｖβを設定する処理とを同時に並行に行
なってもよい。In the overdischarge prevention device 20 of the embodiment, the threshold Vβ is set by calculating the maximum drop rate dVmax after extracting the minimum voltage Vmin, but the order is not limited, and the maximum drop rate dVmax is calculated. The minimum voltage Vmin may be extracted after setting the threshold value Vβ, or
Processing to extract minimum voltage Vmin and maximum drop rate dVma
The process of obtaining x and setting the threshold value Vβ may be performed simultaneously and in parallel.
【００２３】実施例の過放電防止装置２０では、各電池
２３の電圧Ｖｎを検出し、その電圧Ｖｎに対して最低電
圧Ｖｍｉｎと最大降下率ｄＶｍａｘとを求めて過放電を
予測したが、二つまたは三つ以上の電池２３を一つの電
池モジュールとして各電池モジュールの電圧を検出し、
この電池モジュールの電圧に対して最低電圧と最大降下
率とを求めて過放電を予測するものとしてもよい。こう
すれば、集合電池を構成する電池が多いときには特に有
効なものとすることができる。In the overdischarge prevention device 20 of the embodiment, the voltage Vn of each battery 23 is detected, and the minimum voltage Vmin and the maximum drop rate dVmax are obtained for the voltage Vn to predict the overdischarge. Alternatively, the voltage of each battery module is detected by using three or more batteries 23 as one battery module,
An overdischarge may be predicted by obtaining a minimum voltage and a maximum drop rate with respect to the voltage of the battery module. This can be particularly effective when there are many batteries constituting the assembled battery.
【００２４】実施例の過放電防止装置２０では、各電池
２３の電圧Ｖｎを検出し、その電圧Ｖｎに対して最低電
圧Ｖｍｉｎと最大降下率ｄＶｍａｘとを求めて過放電を
予測したが、最低電圧Ｖｍｉｎとこの最低電圧Ｖｍｉｎ
とされた電池２３の電圧の降下率により過放電を予測す
るものとしても差し支えない。In the overdischarge prevention device 20 of the embodiment, the voltage Vn of each battery 23 is detected, and the minimum voltage Vmin and the maximum drop rate dVmax are obtained for the voltage Vn to predict the overdischarge. Vmin and this minimum voltage Vmin
The overdischarge may be predicted based on the voltage drop rate of the battery 23 determined as above.
【００２５】以上、本発明の実施の形態について実施例
を用いて説明したが、本発明はこうした実施例に何等限
定されるものではなく、本発明の要旨を逸脱しない範囲
内において、種々なる形態で実施し得ることは勿論であ
る。The embodiments of the present invention have been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various embodiments may be made without departing from the gist of the present invention. Of course, it can be carried out.
【図１】 本発明の一実施例である過放電防止装置２０
を負荷４０に接続した状態の構成の一例を示す構成図で
ある。FIG. 1 shows an overdischarge prevention device 20 according to an embodiment of the present invention.
FIG. 2 is a configuration diagram illustrating an example of a configuration in a state where the power supply is connected to a load.
【図２】 電子制御ユニット３０により実行される過放
電防止処理ルーチンの一例を示すフローチャートであ
る。FIG. 2 is a flowchart showing an example of an overdischarge prevention processing routine executed by an electronic control unit 30.
【図３】 最大降下率ｄＶｍａｘと閾値Ｖβとの関係の
一例を示すマップである。FIG. 3 is a map showing an example of a relationship between a maximum descent rate dVmax and a threshold value Vβ.
２０ 過放電防止装置、２２ 集合電池、２３ 電池、
２４ 電圧検出器、２６，２８ リレー、２７，２９
アクチュエータ、３０ 電子制御ユニット、３２ ＣＰ
Ｕ、３４ ＲＯＭ、３６ ＲＡＭ、４０ 負荷。20 overdischarge prevention device, 22 assembled battery, 23 battery,
24 voltage detector, 26, 28 relay, 27, 29
Actuator, 30 electronic control unit, 32 CP
U, 34 ROM, 36 RAM, 40 load.
Claims (5)
なる集合電池の過放電を防止する過放電防止装置であっ
て、 前記複数の電池モジュールの各電圧を検出する電池モジ
ュール電圧検出手段と、 該検出された各電圧の変化率を演算する変化率演算手段
と、 該演算された各電圧の変化率と前記電圧検出手段により
検出された前記各電圧とに基づいて前記集合電池の過放
電を予測する過放電予測手段とを備える過放電防止装
置。1. An overdischarge prevention device for preventing an overdischarge of an assembled battery formed by connecting a plurality of battery modules in series, comprising: a battery module voltage detecting means for detecting each voltage of the plurality of battery modules; Rate-of-change calculating means for calculating the rate of change of each detected voltage; and overdischarging of the battery pack based on the calculated rate of change of each voltage and each of the voltages detected by the voltage detecting means. An over-discharge prevention device comprising: an over-discharge predicting unit for predicting.
て、 前記過放電予測手段は、 前記変化率演算手段により演算された前記各電圧の変化
率に基づいて閾値を設定する閾値設定手段を備え、 前記各電圧のうちいずれかが前記閾値設定手段により設
定された閾値を下回るとき、前記集合電池の過放電を予
測する手段である過放電防止装置。2. The over-discharge prevention device according to claim 1, wherein the over-discharge predicting unit sets a threshold based on a change rate of each of the voltages calculated by the change rate calculating unit. An over-discharge prevention device that is a unit that predicts over-discharge of the battery pack when any one of the voltages falls below a threshold set by the threshold setting unit.
率のうち最も変化の大きな値に基づいて閾値を設定する
手段である請求項２記載の過放電防止装置。3. The over-discharge prevention device according to claim 2, wherein said threshold value setting means sets a threshold value based on a value of the largest change of each of the voltages.
防止装置であって、 前記集合電池の電圧を検出する集合電池電圧検出手段を
備え、 前記過放電予測手段は、前記集合電池電圧検出手段によ
り検出された前記集合電池の電圧が所定値未満のとき、
前記集合電池の過放電の予測を行なう手段である過放電
防止装置。4. The over-discharge prevention device according to claim 1, further comprising: an integrated-battery voltage detecting unit configured to detect a voltage of the integrated battery, wherein the over-discharge predicting unit includes detecting the integrated battery voltage. When the voltage of the battery pack detected by the means is less than a predetermined value,
An overdischarge prevention device as a means for predicting overdischarge of the battery pack.
防止装置であって、 前記集合電池から電力ラインに設けられ、該集合電池か
らの電力の供給を停止可能な電力停止手段と、 前記過放電予測手段により前記集合電池の過放電が予測
されたとき、前記電力停止手段により前記集合電池から
の電力の供給を停止するよう該電力停止手段を駆動制御
する過放電制御手段とを備える過放電防止装置。5. The over-discharge prevention device according to claim 1, wherein: a power stopping unit provided on the power line from the battery pack and capable of stopping supply of power from the battery pack; And an overdischarge control means for controlling the power stop means so as to stop the supply of power from the battery pack by the power stop means when the overdischarge prediction means predicts overdischarge of the battery pack. Discharge prevention device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06796199A JP3994570B2 (en) | 1999-03-15 | 1999-03-15 | Overdischarge prevention device for assembled battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06796199A JP3994570B2 (en) | 1999-03-15 | 1999-03-15 | Overdischarge prevention device for assembled battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000270488A true JP2000270488A (en) | 2000-09-29 |
| JP3994570B2 JP3994570B2 (en) | 2007-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06796199A Expired - Fee Related JP3994570B2 (en) | 1999-03-15 | 1999-03-15 | Overdischarge prevention device for assembled battery |
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