JP2001110457A - Method for determining abnormal condition of battery, apparatus for determining abnormal condition of battery, and secondary battery pack - Google Patents
Method for determining abnormal condition of battery, apparatus for determining abnormal condition of battery, and secondary battery packInfo
- Publication number
- JP2001110457A JP2001110457A JP28536099A JP28536099A JP2001110457A JP 2001110457 A JP2001110457 A JP 2001110457A JP 28536099 A JP28536099 A JP 28536099A JP 28536099 A JP28536099 A JP 28536099A JP 2001110457 A JP2001110457 A JP 2001110457A
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- Prior art keywords
- battery
- current
- battery voltage
- flowing
- charging current
- Prior art date
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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
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電池の異常状態判
定方法、装置、及び２次電池パックに係り、特に、２次
電池が過充電等の異常状態になったことを早期に検出し
て、充電電流を遮断し、必要に応じて放電させることが
できる電池の異常状態判定方法、装置、及び２次電池パ
ックに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for judging an abnormal state of a battery and a secondary battery pack, and more particularly to a method for detecting an abnormal state such as overcharge of a secondary battery at an early stage. The present invention relates to a method and an apparatus for determining an abnormal state of a battery capable of interrupting a charging current and discharging the battery as necessary.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】２次電
池であるリチウムイオン電池を充電するとき、正常状態
では、一定充電電流（充電方向を負にしたとき、例え
ば、−１Ｃ（一定の放電が１時間継続可能な電流値））
で電圧が一定値（通常、４．１Ｖ前後）まで徐々に上昇
し、電圧が一定値になった所で充電電流が徐々に低下し
て０になる（ＣＣ−ＣＶ充電）。過充電等の異常状態で
は、充電電流は減少せずに流れ続け、このとき電圧は殆
ど変化がないか降下するかあるいは急激に上昇する。従
来は、電圧が所定値以上か、または電流値が所定値以上
かを判断することにより、異常状態を判定していたた
め、電池の異常状態を正確に判定することができなかっ
た。2. Description of the Related Art When a lithium ion battery as a secondary battery is charged, in a normal state, a constant charge current (when the charge direction is negative, for example, -1C (constant discharge) Is the current value that can last for one hour))
, The voltage gradually increases to a constant value (usually around 4.1 V), and when the voltage reaches the constant value, the charging current gradually decreases to 0 (CC-CV charging). In an abnormal state such as overcharging, the charging current continues to flow without decreasing, and at this time, the voltage hardly changes, drops, or sharply increases. Conventionally, the abnormal state is determined by determining whether the voltage is equal to or higher than a predetermined value or the current value is equal to or higher than a predetermined value. Therefore, the abnormal state of the battery cannot be accurately determined.
【０００３】特開平９−１７４５８号公報には、満充電
までの充電領域（定電流充電または定電圧充電）におい
て、定電流充電では電圧値が設定値より小さいとき、定
電圧充電では電流値が、設定した値より大きいときに、
微小短絡として検出することが開示されている。また、
各サイクル充電での挙動から設定時間、電圧値、電流値
をきめ細かく設定している。これは、基本的に同じ電池
をサイクル試験する際には有効である。[0003] Japanese Patent Application Laid-Open No. 9-17458 discloses that, in a charging region (constant current charging or constant voltage charging) up to full charging, when the voltage value is smaller than a set value in constant current charging, the current value is constant in constant voltage charging. , When greater than the set value,
It is disclosed that detection is performed as a minute short circuit. Also,
The set time, voltage value and current value are finely set from the behavior in each cycle charging. This is effective when a cycle test is basically performed on the same battery.
【０００４】しかしながら、一般的にリチウム電池で
は、電極材料の構成や種類によって定電圧充電の電圧値
が異なり、また、容量も大きく変化し、充電電流も変化
する。特に、パック電池に構成した場合、電池の直並列
数によってその値が大きく変化する。このように特性が
異なる電池を充電する際には、設定値や挙動が異なるた
め、従来の技術は使用することができない。[0004] However, in a lithium battery, the voltage value of constant voltage charging generally varies depending on the configuration and type of electrode material, the capacity greatly changes, and the charging current also changes. In particular, in the case of a battery pack, the value greatly changes depending on the number of series-parallel batteries. When charging batteries having different characteristics as described above, the related art cannot be used because the set values and behaviors are different.
【０００５】特に、設定電圧値を間違えてしまった場合
には、定電圧充電にならず、定電流充電が行われ、電圧
値は本来設定すべき値の電圧値付近で一定になる。この
場合、上記従来技術では設定した時間を経過して初めて
異常を検出することができるにすぎない。[0005] In particular, when the set voltage value is mistaken, constant-current charging is performed instead of constant-voltage charging, and the voltage value becomes constant near the voltage value to be originally set. In this case, in the above-described conventional technique, it is only possible to detect an abnormality only after a set time has elapsed.
【０００６】また、電池の個体差（例えば、充電状態の
違い、満充電容量の違い）によっても充放電の特性が異
なるため、電池を付け替えて充放電させるときにも適用
できない。[0006] In addition, since the charge / discharge characteristics also differ depending on the individual difference of the batteries (eg, the difference in the state of charge, the difference in the full charge capacity), the method cannot be applied to the case where the batteries are replaced and charged / discharged.
【０００７】本発明は、上記従来の問題点を解消するた
めになされたもので、２次電池が過充電等の異常状態に
なったことを早期に検出することができる電池の異常状
態判定方法、及び電池の異常状態判定装置、電池が異常
状態に推移していると判定されたときに２次電池に流れ
るの電流を遮断し、必要に応じて電池を放電させるよう
にした電池パックを提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and a method for judging an abnormal state of a battery which can early detect that the secondary battery has entered an abnormal state such as overcharge. And an apparatus for determining an abnormal state of a battery, and a battery pack adapted to interrupt a current flowing to a secondary battery when the battery is determined to be in an abnormal state and discharge the battery as necessary. The purpose is to do.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明の電池の異常状態判定方法は、以下のａ〜ｆ
の条件のいずれか1つを満たすとき、２次電池が異常状
態に推移していると判定するものである。 ａ．充電電流が所定値以上流れ、かつ電池電圧が略一定
状態のとき、 ｂ．充電電流が流れ、かつ電池電圧が減少したとき、 ｃ．充電電流が流れ、かつ電池電圧が急激に上昇したと
き、 ｄ．充電電流及び放電電流が流れていない状態で電池電
圧が減少したとき、 ｅ．放電電流が流れているか、または充電電流及び放電
電流が流れていない状態で電池電圧が上昇したとき、 ｆ．放電電流が流れているか、または充電電流及び放電
電流が流れていない状態で電池電圧が急激に減少したと
き。Means for Solving the Problems In order to achieve the above object, a method for determining an abnormal state of a battery according to the present invention comprises the following steps a to
When any one of the conditions is satisfied, it is determined that the secondary battery is in an abnormal state. a. When the charging current flows over a predetermined value and the battery voltage is substantially constant; b. When the charging current flows and the battery voltage decreases; c. When the charging current flows and the battery voltage rises sharply; d. When the battery voltage decreases in a state where the charging current and the discharging current are not flowing, e. When the battery voltage rises in the state where the discharge current is flowing or the charging current and the discharging current are not flowing, f. When the battery voltage suddenly decreases while the discharge current is flowing or the charging current and the discharging current are not flowing.
【０００９】また、請求項２の電池の異常状態判定装置
は、電池電圧を検出する電圧検出手段と、充電電流及び
放電電流を検出する電流検出手段と、上記のａ〜ｆの条
件のいずれか1つを満たすとき、２次電池が異常状態に
推移していると判定する異常状態判定手段と、を含んで
構成したものである。According to a second aspect of the present invention, there is provided an apparatus for judging an abnormal state of a battery, comprising: a voltage detecting means for detecting a battery voltage; a current detecting means for detecting a charging current and a discharging current; An abnormal state determining means for determining that the secondary battery is in an abnormal state when one is satisfied.
【００１０】そして、請求項３の２次電池パックは、上
記の電池の異常状態判定装置と、２次電池と、前記電池
の異常状態判定装置によって、２次電池が異常状態に推
移していると判定されたときに、２次電池に流れる電流
を遮断し、電池電圧が所定値以上のときに、２次電池を
放電させる遮断／放電手段と、を含んで構成したもので
ある。According to a second aspect of the present invention, in the secondary battery pack, the secondary battery is in an abnormal state by the battery abnormal state determining device, the secondary battery, and the battery abnormal state determining device. When the battery voltage is equal to or higher than a predetermined value, and a discharge / discharge means for discharging the secondary battery when the battery voltage is equal to or higher than a predetermined value.
【００１１】上記各発明によれば、充電電流が所定値以
上流れ、かつ電池電圧が略一定状態のとき、充電電流が
流れ、かつ電池電圧が減少し、または電池電圧が急激に
上昇したとき、充電電流及び放電電流が流れていない状
態で電池電圧が減少したとき、放電電流が流れている
か、または充電電流及び放電電流が流れていない状態で
電池電圧が上昇し、電池電圧が急激に減少したときのい
ずれか1つを満たすとき、電池が異常状態に推移してい
ると判定しているので、２次電池が過充電等の異常状態
になったことを早期に検出することができる。また、２
次電池が異常状態に推移していると判定されたときに２
次電池に流れる電流を遮断し、必要に応じて電池を放電
させることにより、電池の異常状態を早期に把握し、そ
れ以上の異常状態を回避あるいは回復させることができ
る。According to each of the above inventions, when the charging current flows over a predetermined value and the battery voltage is substantially constant, when the charging current flows and the battery voltage decreases or the battery voltage sharply increases, When the battery voltage decreased in the state where the charging current and the discharging current did not flow, the discharging current was flowing, or the battery voltage increased in the state where the charging current and the discharging current did not flow, and the battery voltage decreased rapidly. When any one of the above conditions is satisfied, it is determined that the battery has transitioned to the abnormal state, so that it is possible to early detect that the secondary battery has entered an abnormal state such as overcharge. Also, 2
2 when it is determined that the next battery is in the abnormal state
By interrupting the current flowing to the next battery and discharging the battery as necessary, an abnormal state of the battery can be grasped at an early stage, and a further abnormal state can be avoided or recovered.
【００１２】[0012]
【発明の実施の形態】以下、図面を参照して本発明の実
施の形態について説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１３】本実施の形態は、図１に示すように、リチ
ウムイオン電池等の２次電池Ｂが収納された電池パック
１０に対して並列に、充放電回路１２を接続して構成さ
れている。電池パック１０内には、２次電池Ｂ、２次電
池Ｂと並列に接続された電圧検出装置１４、及び２次電
池Ｂの正極と充放電回路１２との間に接続された電流検
出装置１６と電流遮断スイッチＳ１とからなる直列回路
が収納されると共に、一端が電流計１６と電流遮断スイ
ッチＳ１との間に接続され、かつ他端が２次電池Ｂの負
極と充放電回路１２との間に接続された短絡スイッチＳ
２と放電抵抗Ｒとからなる直列回路が収納されている。In this embodiment, as shown in FIG. 1, a charge / discharge circuit 12 is connected in parallel with a battery pack 10 containing a secondary battery B such as a lithium ion battery. . In the battery pack 10, a secondary battery B, a voltage detecting device 14 connected in parallel with the secondary battery B, and a current detecting device 16 connected between the positive electrode of the secondary battery B and the charging / discharging circuit 12. And a current cutoff switch S1 are housed, and one end is connected between the ammeter 16 and the current cutoff switch S1, and the other end is connected between the negative electrode of the secondary battery B and the charge / discharge circuit 12. Short-circuit switch S connected between
2 and a series circuit composed of a discharge resistor R.
【００１４】また、電池パック１０内には、電圧検出装
置１４、電流検出装置１６、電流遮断スイッチＳ１、及
び短絡スイッチＳ２の各々に接続され、かつマイクロコ
ンピュータを含んで構成された計測制御回路１８が収納
されている。In the battery pack 10, a measurement control circuit 18 connected to each of the voltage detection device 14, the current detection device 16, the current cutoff switch S1, and the short circuit switch S2 and including a microcomputer is provided. Is stored.
【００１５】以下、図２を参照して、計測制御回路１８
のマイクロコンピュータで実行される充放電及び異常状
態に推移していると判定されたときの異常時の処理を含
む制御ルーチンについて説明する。Referring now to FIG. 2, the measurement control circuit 18
A control routine including a process performed when the microcomputer is determined to be in an abnormal state when it is determined that the battery has transitioned to an abnormal state will be described.
【００１６】図２の制御ルーチンは、計測制御回路１８
のマイクロコンピュータによって電流遮断スイッチＳ１
をオン、短絡スイッチＳ２をオフして充放電回路１２に
よる２次電池の充放電を開始させた後、所定時間毎に実
行される。ステップ１０２では、２次電池を通って流れ
る電流（以下、電池電流）Ｉが負か否かを判断すること
により、充電中か、放電中か、または充放電停止中かを
判断する。本実施の形態では、充電のとき電池電流Ｉを
負、放電のとき電池電流Ｉを正とする。電池電流Ｉが負
のとき、すなわち充電中は、ステップ１０４において、
電池電圧の単位時間（例えば、１０秒）当たりの変化量
（以下、電池電圧の変化量）ΔＶが負か否かを判断する
ことにより、電池電圧Ｖが減少しているか否かを判断す
る。The control routine shown in FIG.
Current cut-off switch S1 by microcomputer
Is turned on, the short-circuit switch S2 is turned off, and the charging / discharging of the secondary battery by the charging / discharging circuit 12 is started. In step 102, it is determined whether the current flowing through the secondary battery (hereinafter referred to as battery current) I is negative to determine whether the battery is charging, discharging, or stopping charging and discharging. In the present embodiment, the battery current I is negative when charging and the battery current I is positive when discharging. When the battery current I is negative, that is, during charging, in step 104,
It is determined whether or not the battery voltage V is decreasing by determining whether or not the amount of change in battery voltage per unit time (for example, 10 seconds) (hereinafter, the amount of change in battery voltage) ΔV is negative.
【００１７】電池電圧の変化量ΔＶが負の場合は、充電
しているにも拘わらず、電池電圧Ｖが減少しているの
で、異常と判断して異常時の処理を実行する。この異常
時の処理では、まずステップ１２０で電流遮断スイッチ
Ｓ１をオフして充電電流を遮断し、ステップ１２４で電
池電圧Ｖが所定値Ｖ0（例えば、３．５Ｖ、満充電容量
の２０％相当の値）以上か否かを判断し、電池電圧Ｖが
所定値Ｖ0以上の場合は、ステップ１２６で短絡スイッ
チＳ２をオンして放電抵抗Ｒを介して２次電池を安全に
放電させる。なお、このとき放電抵抗Ｒを変化させ、更
に安全に放電させるようにしてもよい。If the change amount .DELTA.V in the battery voltage is negative, the battery voltage V has decreased in spite of being charged, so that it is determined that the battery is abnormal, and the processing at the time of the abnormality is executed. In the process at the time of this abnormality, first, at step 120, the current cutoff switch S1 is turned off to cut off the charging current, and at step 124, the battery voltage V becomes a predetermined value V 0 (for example, 3.5 V, corresponding to 20% of the full charge capacity). It is determined whether the battery voltage V is equal to or greater than the predetermined value V 0. If the battery voltage V is equal to or greater than the predetermined value V 0 , the short-circuit switch S2 is turned on at step 126 to safely discharge the secondary battery via the discharge resistor R. At this time, the discharge resistance R may be changed to discharge more safely.
【００１８】電池電圧の変化量ΔＶが０以上の場合、す
なわち電池電圧Ｖが一定または増加している場合には、
ステップ１０６で電池電圧の変化量ΔＶが閾値ΔＶ２以
上か否かを判断することにより、電池電圧Ｖが急激に上
昇しているか否かを判断する。閾値ΔＶ２は、変化量Δ
Ｖが急激に変化しているか否かを判断するための閾値で
あるので、閾値の中でも比較的大きな値、例えば０．２
Ｖが採用される。When the change amount ΔV of the battery voltage is 0 or more, that is, when the battery voltage V is constant or increasing,
In step 106, it is determined whether or not the battery voltage change amount ΔV is greater than or equal to the threshold value ΔV2, thereby determining whether or not the battery voltage V is rapidly increasing. The threshold value ΔV2 is the change amount Δ
Since the threshold value is used to determine whether or not V is changing rapidly, a relatively large value among the threshold values, for example, 0.2
V is adopted.
【００１９】ステップ１０６で電池電圧Ｖが、急激に上
昇している場合には、異常と判断し上記で説明した異常
時の処理を実行する。If the battery voltage V rises sharply at step 106, it is determined that the battery voltage V is abnormal, and the above-described processing for an abnormality is executed.
【００２０】ステップ１０６で電池電圧が急激に上昇し
ていないと判断された場合には、ステップ１０８におい
て電流Ｉが充電電流の閾値Ｉ１（例えば、−１／３Ｃ
（一定の放電が１時間継続可能な電流値Ｃの１／３）以
下か否かを判断する。If it is determined at step 106 that the battery voltage has not risen sharply, then at step 108 the current I is set to the charging current threshold I1 (for example,-／ C).
It is determined whether the current value is equal to or less than (（of the current value C at which a constant discharge can be continued for one hour).
【００２１】電流Ｉが充電電流の閾値Ｉ１を越えている
場合には、正常であると判断し、電流Ｉが充電電流の閾
値Ｉ１以下の場合には、ステップ１１０で電池電圧の変
化量ΔＶが、閾値ΔＶ１以下か否かを判断することによ
り、電池電圧が略一定か否かを判断する。閾値ΔＶ１
は、電池電圧が略一定か否かを判定するための閾値であ
り、０に近い正の小さな値、例えば０．０１Ｖを採用す
ることができる。ステップ１０４及びステップ１０６で
否定判断されることにより、ΔＶ２＞ΔＶ≧０になって
いるので、ステップ１１０の判断が肯定のときはΔＶ１
≧ΔＶ≧０（本実施の形態の例では、０．０１≧ΔＶ≧
０）であるので、ステップ１１０の判断によって電池電
圧が略一定であることを判断することができる。If the current I exceeds the charging current threshold I1, it is determined that the current is normal. If the current I is equal to or less than the charging current threshold I1, the change amount .DELTA.V of the battery voltage is determined at step 110. , To determine whether the battery voltage is substantially constant or not. Threshold value ΔV1
Is a threshold value for determining whether or not the battery voltage is substantially constant, and a small positive value close to 0, for example, 0.01 V can be adopted. Since ΔV2> ΔV ≧ 0 by making a negative determination in steps 104 and 106, if the determination in step 110 is affirmative, ΔV1
≧ ΔV ≧ 0 (in the example of the present embodiment, 0.01 ≧ ΔV ≧
0), it can be determined that the battery voltage is substantially constant by the determination in step 110.
【００２２】電池電圧Ｖが略一定のときには、充電して
いるにも拘わらず、電池電圧Ｖが上昇していないので異
常と判断し、上記で説明した異常時の処理を実行する。
一方、電池電圧Ｖの変化量ΔＶが閾値ΔＶ１を越えてい
るとき、すなわち電池電圧Ｖが略一定でないときは、正
常と判断する。When the battery voltage V is substantially constant, it is determined that the battery voltage V has not risen in spite of the fact that the battery is charged.
On the other hand, when the change amount ΔV of the battery voltage V exceeds the threshold value ΔV1, that is, when the battery voltage V is not substantially constant, it is determined that the battery voltage V is normal.
【００２３】ステップ１０２で２次電池を通って流れる
電流Ｉが０または正と判断された場合、すなわち放電中
か充放電停止中のいずれかの場合には、ステップ１１２
におて電池電圧の変化量ΔＶが０を越えているか否かを
判断することにより、電池電圧Ｖが上昇しているか否か
を判断する。変化量ΔＶが０を越えていると判断された
場合には、正常状態では放電中または充放電停止中には
電池電圧が下降するか変化しないにも拘わらず、電池電
圧が上昇しているので、異常と判断し、ステップ１２２
で電流遮断スイッチＳ１をオフにし、ステップ１２４で
電池電圧Ｖが所定値Ｖ0以上か否かを判断し、電池電圧
Ｖが所定値Ｖ0以上の場合は、ステップ１２６で短絡ス
イッチＳ２をオンして放電抵抗Ｒを介して２次電池を安
全に放電させることにより、上記で説明した異常時の処
理を実行する。なお、このとき放電抵抗Ｒを変化させ更
に安全に放電させるようにしてもよい。If it is determined in step 102 that the current I flowing through the secondary battery is 0 or positive, that is, if discharging or stopping charging / discharging, step 112
In this case, it is determined whether or not the change amount ΔV of the battery voltage exceeds 0, thereby determining whether or not the battery voltage V is increasing. When it is determined that the change amount ΔV exceeds 0, the battery voltage is increasing in spite of the normal state of discharging or stopping charging / discharging despite the fact that the battery voltage falls or does not change. Is determined to be abnormal, step 122
In off the current cut-off switch S1, the battery voltage V is determined whether or not a predetermined value greater than or equal to V 0 in step 124, if the battery voltage V is higher than the predetermined value V 0, and turns on the short-circuit switch S2 at step 126 Thus, the above-described abnormal processing is performed by safely discharging the secondary battery via the discharge resistor R. At this time, the discharge resistance R may be changed to discharge more safely.
【００２４】電池電圧の変化量ΔＶが０以下の場合、す
なわち電池電圧が変化しないか下降している場合には、
ステップ１１４で、電池電圧の変化量ΔＶが閾値ΔＶ４
以下か否かを判断することにより、電池電圧Ｖが急激に
減少しているか否かを判定する。この閾値ΔＶ４は、例
えば、−０．１Ｖとすることができる。電池電圧が急激
に減少している場合には、異常と判断し、上記で説明し
た異常時の処理を実行する。When the change amount ΔV of the battery voltage is 0 or less, that is, when the battery voltage does not change or falls,
In step 114, the change amount ΔV of the battery voltage is equal to the threshold value ΔV4
It is determined whether or not the battery voltage V is rapidly reduced by determining whether or not the battery voltage V is below. This threshold value ΔV4 can be, for example, −0.1V. If the battery voltage is rapidly decreasing, it is determined that the battery is abnormal, and the above-described process for an abnormal case is performed.
【００２５】ステップ１１４で電池電圧が急激に変化し
ていないと判断された場合には、ステップ１１６におい
て電池電流Ｉが０か否かを判断することにより、放電中
か充放電停止中かを判断する。電池電流Ｉが正のとき、
すなわち放電中は、ステップ１１２及びステップ１１４
で電池電圧の変化量ΔＶが０以下でかつ急変していない
と判断されているので、正常と判断してこのルーチンを
終了する。If it is determined in step 114 that the battery voltage has not changed abruptly, it is determined in step 116 whether or not the battery current I is 0 to determine whether discharging is being performed or charging / discharging is being stopped. I do. When the battery current I is positive,
That is, during the discharge, Steps 112 and 114 are performed.
It is determined that the change amount .DELTA.V of the battery voltage is equal to or less than 0 and does not change suddenly, so that the routine is determined to be normal and the routine is terminated.
【００２６】電池電流Ｉが０のとき、すなわち充放電停
止中は、ステップ１１８で電池電圧の変化量ΔＶが充放
電を停止しているときに自然放電により電圧が減少する
ときの閾値ΔＶ３（例えば、−０．００１Ｖ）以下か否
かを判断する。電池電圧の変化量ΔＶが閾値ΔＶ３以下
とき、すなわちΔＶ４＜ΔＶ≦ΔＶ３（本実施の形態の
例では、−０．１＜ΔＶ≦−０．００１）のときは、電
池電圧の低下量が自然放電による低下量より大きいの
で、異常と判断し、上記で説明した異常時の処理を実行
する。一方、電池電圧の変化量ΔＶが閾値ΔＶ３を越え
る場合には、電池電圧の低下が自然放電による低下量以
下であるので、正常と判断する。When the battery current I is 0, that is, during charging / discharging, the change amount ΔV of the battery voltage at step 118 is a threshold value ΔV3 at which the voltage decreases due to spontaneous discharge when charging / discharging is stopped (for example, , -0.001 V) or less. When the change amount ΔV of the battery voltage is equal to or less than the threshold value ΔV3, that is, when ΔV4 <ΔV ≦ ΔV3 (−0.1 <ΔV ≦ −0.001 in the example of the present embodiment), the decrease amount of the battery voltage naturally increases. Since it is larger than the amount of decrease due to the discharge, it is determined that there is an abnormality, and the above-described process for an abnormality is executed. On the other hand, when the change amount ΔV of the battery voltage exceeds the threshold value ΔV3, it is determined that the battery voltage is normal because the decrease of the battery voltage is equal to or less than the amount of decrease due to the natural discharge.
【００２７】図３（Ａ）は、異常時に本発明を適用しな
かった時、（Ｂ）は異常時に本発明を適用した時の例
で、電池電圧、電流、電池温度の変化を示すものであ
る。FIG. 3A shows an example in which the present invention is not applied in an abnormal state, and FIG. 3B shows an example in which the present invention is applied in an abnormal state, showing changes in battery voltage, current and battery temperature. is there.
【００２８】図３（Ａ）に示すように４．１Ｖ付近では
電池電圧が一定になり、かつ電流が充電方向に１Ｃ流れ
ていても充電を続けると、電池温度が上昇するなどの異
常状態になる。図３（Ｂ）では、４．１Ｖ付近で電池電
圧が一定になり、かつ電流が充電方向に１Ｃ流れている
ので、本発明により異常状態と判定し、充電電流を停止
し、電池電圧が３．５Ｖ以上の４．１Ｖ前後あるので、
放電抵抗により放電する。放電したことで電池電圧が下
がり、異常状態が防止される。As shown in FIG. 3 (A), the battery voltage becomes constant around 4.1 V, and if charging continues, the battery temperature rises, etc., even if current is flowing at 1 C in the charging direction. Become. In FIG. 3B, since the battery voltage becomes constant around 4.1 V and the current flows by 1 C in the charging direction, it is determined that the battery is in an abnormal state according to the present invention, and the charging current is stopped. Since it is around 4.1V which is more than 0.5V,
Discharge by discharge resistance. The battery voltage drops due to the discharge, and an abnormal state is prevented.
【００２９】[0029]
【発明の効果】以上説明したように、本発明によれば、
上記のａ〜ｆの条件のいずれか1つを満たすとき、電池
が異常状態に推移していると判定しているので、２次電
池が過充電等の異常状態になったことを早めに検出する
ことができる、という効果が得られる。As described above, according to the present invention,
When any one of the above conditions a to f is satisfied, it is determined that the battery has transitioned to an abnormal state. Therefore, it is early detected that the secondary battery has entered an abnormal state such as overcharge. Can be obtained.
【００３０】また、２次電池が異常状態に推移している
と判定されたときに２次電池に流れる電流を遮断し、必
要に応じて電池を放電させれば、電池の異常状態を回避
あるいは回復させることができる、という効果が得られ
る。When it is determined that the secondary battery has transitioned to an abnormal state, the current flowing through the secondary battery is cut off and the battery is discharged as necessary, so that the abnormal state of the battery can be avoided or The effect of being able to recover is obtained.
【図１】本実施の形態のブロック図である。FIG. 1 is a block diagram of an embodiment.
【図２】本実施の形態の計測制御回路による異常判定処
理ルーチンを示す流れ図である。FIG. 2 is a flowchart illustrating an abnormality determination processing routine performed by a measurement control circuit according to the present embodiment.
【図３】（Ａ）は異常時に本発明を適用しなかった場合
の電池電圧、電流、及び電池温度の変化の例を示す線図
であり、（Ｂ）は異常時に本発明を適用した場合の電池
電圧、電流、及び電池温度の変化の他の例を示す線図で
ある。3A is a diagram showing an example of changes in battery voltage, current, and battery temperature when the present invention is not applied at the time of abnormality; FIG. 3B is a diagram showing a case where the present invention is applied at the time of abnormality; FIG. 7 is a diagram showing another example of changes in the battery voltage, current, and battery temperature of FIG.
１０ 電池パック １２ 充放電回路 １８ 計測制御回路 10 Battery pack 12 Charge / discharge circuit 18 Measurement control circuit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鋤柄 和俊 愛知県愛知郡長久手町大字長湫字横道41番 地の１ 株式会社豊田中央研究所内 (72)発明者 板橋 利幸 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 Ｆターム(参考） 5H030 AA06 AA10 AS06 BB01 BB21 FF42 FF43 FF44 FF52 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazutoshi Kazura, 41-Cho, Yokomichi, Nagakute-cho, Aichi-gun, Aichi Prefecture Inside Toyota Central R & D Laboratories Co., Ltd. F-term (reference) in Toyota Motor Corporation 5H030 AA06 AA10 AS06 BB01 BB21 FF42 FF43 FF44 FF52
Claims (3)
すとき、２次電池が異常状態に推移していると判定する
電池の異常状態判定方法。 ａ．充電電流が所定値以上流れ、かつ電池電圧が略一定
状態のとき、 ｂ．充電電流が流れ、かつ電池電圧が減少したとき、 ｃ．充電電流が流れ、かつ電池電圧が急激に上昇したと
き、 ｄ．充電電流及び放電電流が流れていない状態で電池電
圧が減少したとき、 ｅ．放電電流が流れているか、または充電電流及び放電
電流が流れていない状態で電池電圧が上昇したとき、 ｆ．放電電流が流れているか、または充電電流及び放電
電流が流れていない状態で電池電圧が急激に減少したと
き。1. A method for determining an abnormal state of a battery, which determines that the secondary battery has transitioned to an abnormal state when any one of the following conditions a to f is satisfied. a. When the charging current flows over a predetermined value and the battery voltage is substantially constant; b. When the charging current flows and the battery voltage decreases; c. When the charging current flows and the battery voltage rises sharply; d. When the battery voltage decreases in a state where the charging current and the discharging current are not flowing, e. When the battery voltage rises in the state where the discharge current is flowing or the charging current and the discharging current are not flowing, f. When the battery voltage suddenly decreases while the discharge current is flowing or the charging current and the discharging current are not flowing.
電池が異常状態に推移していると判定する異常状態判定
手段と、 を含む電池の異常状態判定装置。 ａ．充電電流が所定値以上流れ、かつ電池電圧が略一定
状態のとき、 ｂ．充電電流が流れ、かつ電池電圧が減少したとき、 ｃ．充電電流が流れ、かつ電池電圧が急激に上昇したと
き、 ｄ．充電電流及び放電電流が流れていない状態で電池電
圧が減少したとき、 ｅ．放電電流が流れているか、または充電電流及び放電
電流が流れていない状態で電池電圧が上昇したとき、 ｆ．放電電流が流れているか、または充電電流及び放電
電流が流れていない状態で電池電圧が急激に減少したと
き。2. A voltage detecting means for detecting a battery voltage, a current detecting means for detecting a charging current and a discharging current, and when one of the following conditions a to f is satisfied, the secondary battery is in an abnormal state. An abnormal state determination device for a battery, comprising: an abnormal state determination unit that determines that the state of the battery has changed. a. When the charging current flows over a predetermined value and the battery voltage is substantially constant; b. When the charging current flows and the battery voltage decreases; c. When the charging current flows and the battery voltage rises sharply; d. When the battery voltage decreases in a state where the charging current and the discharging current are not flowing, e. When the battery voltage rises in the state where the discharge current is flowing or the charging current and the discharging current are not flowing, f. When the battery voltage suddenly decreases while the discharge current is flowing or the charging current and the discharging current are not flowing.
と、 ２次電池と、 前記電池の異常状態判定装置によって、２次電池が異常
状態に推移していることが判定されたときに、２次電池
に流れる電流を遮断し、電池電圧が所定値以上のとき
に、２次電池を放電させる遮断／放電手段と、 を含む２次電池パック。3. An abnormal state determining device for a battery according to claim 2, a secondary battery, and when the abnormal state determining device determines that the secondary battery is in an abnormal state. And a shutoff / discharge means for interrupting a current flowing through the secondary battery and discharging the secondary battery when the battery voltage is equal to or higher than a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28536099A JP2001110457A (en) | 1999-10-06 | 1999-10-06 | Method for determining abnormal condition of battery, apparatus for determining abnormal condition of battery, and secondary battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28536099A JP2001110457A (en) | 1999-10-06 | 1999-10-06 | Method for determining abnormal condition of battery, apparatus for determining abnormal condition of battery, and secondary battery pack |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2008131117A Division JP2008220168A (en) | 2008-05-19 | 2008-05-19 | Secondary battery pack and method for avoiding abnormal state thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001110457A true JP2001110457A (en) | 2001-04-20 |
Family
ID=17690560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28536099A Pending JP2001110457A (en) | 1999-10-06 | 1999-10-06 | Method for determining abnormal condition of battery, apparatus for determining abnormal condition of battery, and secondary battery pack |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001110457A (en) |
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| JP2010231939A (en) * | 2009-03-26 | 2010-10-14 | Ntt Facilities Inc | Auxiliary power system and protection method of auxiliary power system |
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1999
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2436740A1 (en) | 2003-09-29 | 2012-04-04 | Fujifilm Corporation | Ink for inkjet printing, ink set for inkjet printing, inkjet recording material and producing method for inkjet recording material, and inkjet recording method |
| WO2008114734A1 (en) * | 2007-03-15 | 2008-09-25 | Mitsubishi Heavy Industries, Ltd. | Accumulation system |
| JP2008228518A (en) * | 2007-03-15 | 2008-09-25 | Mitsubishi Heavy Ind Ltd | Power storage system |
| US8217624B2 (en) | 2007-03-15 | 2012-07-10 | Mitsubishi Industries, Ltd. | Power storage system |
| JP2010231939A (en) * | 2009-03-26 | 2010-10-14 | Ntt Facilities Inc | Auxiliary power system and protection method of auxiliary power system |
| JP2015035949A (en) * | 2010-10-18 | 2015-02-19 | 有限会社オーエイチケー研究所 | Battery charger and battery charging method |
| EP3109653A1 (en) * | 2015-06-23 | 2016-12-28 | Robert Bosch Gmbh | Method for detection of a short circuit within an energy storage device |
| US10365312B2 (en) | 2015-06-23 | 2019-07-30 | Robert Bosch Gmbh | Method for detection of short circuits within an energy storage device |
| JP2017184590A (en) * | 2016-03-31 | 2017-10-05 | 東亜ディーケーケー株式会社 | Controller with battery diagnostic function for uninterruptible power supply device and diagnostic method thereof |
| JP2021536091A (en) * | 2019-08-07 | 2021-12-23 | 北京小米移動軟件有限公司Beijing Xiaomi Mobile Software Co., Ltd. | Battery modules, charging methods and devices, electronic devices and readable storage media |
| JP7061136B2 (en) | 2019-08-07 | 2022-04-27 | 北京小米移動軟件有限公司 | Battery modules, charging methods and devices, electronic devices and readable storage media |
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