JP3433000B2 - Charge method for pulse charging of assembled batteries - Google Patents
Charge method for pulse charging of assembled batteriesInfo
- Publication number
- JP3433000B2 JP3433000B2 JP13535496A JP13535496A JP3433000B2 JP 3433000 B2 JP3433000 B2 JP 3433000B2 JP 13535496 A JP13535496 A JP 13535496A JP 13535496 A JP13535496 A JP 13535496A JP 3433000 B2 JP3433000 B2 JP 3433000B2
- Authority
- JP
- Japan
- Prior art keywords
- charging
- battery
- voltage
- battery pack
- charge
- 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.)
- Expired - Fee Related
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
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、電池の過充電を防
止する保護回路を内蔵する組電池をパルス充電する充電
方法に関する。
【０００２】
【従来の技術】電池をパルス充電する充電方法は、短時
間に大きな電流を流して、急速充電できる。保護回路を
内蔵する組電池をパルス充電できる充電回路を図１に示
す。組電池１の保護回路２は、電池の過充電を防止する
充電制御スイッチ３を内蔵している。この充電制御スイ
ッチ３を、オンオフに切り換えてパルス充電に併用でき
る。例えば、この充電回路は、電池の充電を休止させる
ときに電池電圧を検出し、電池電圧が設定電圧に低下す
るまでは、充電を休止し、電池電圧が設定電圧よりも低
下すると、充電を再開してパルス充電できる。
【０００３】このようにして組電池１を充電すると、図
２に示すように、電池電圧と充電電流が変化して、電池
が満充電に近付くにしたがって、休止時間が長くなる。
満充電に近付いた電池は、電池電圧が低下するのが遅く
なるからである。したがって、電池の休止時間を検出し
て満充電を検出することができる。組電池１が満充電さ
れると、定電圧定電流電源５と組電池１との間に接続す
る充電スイッチ４をオフにして、充電を停止させる。
【０００４】
【発明が解決しようとする課題】組電池１が満充電され
たと判定して、充電スイッチ４をオフに切り換えると、
組電池１が満充電されているにもかかわらず、充電スイ
ッチ４を制御する制御回路６が、組電池１は満充電され
ていないと誤認し、充電スイッチ４をオンに切り換えて
再充電を開始することがある。制御回路６が、組電池１
の出力電圧を検出して、充電スイッチ４を制御するから
である。組電池１の充電制御スイッチ３と充電スイッチ
４の両方がオフになると、組電池１の出力電圧は、内蔵
する電池電圧よりも低くなる。充電制御スイッチ３に並
列に接続されるダイオード７が、電池と直列に接続され
て、組電池１の出力電圧を低下させるからである。図に
示す組電池１の保護回路２は、充電制御スイッチ３にＦ
ＥＴを使用しているので、並列に寄生ダイオードが接続
されている。充電制御スイッチ３には、ＦＥＴに換わっ
て、逆向きにダイオードを並列接続したトランジスター
も使用できるが、この場合も、トランジスターの順方法
と逆向きに電流が流れると、ダイオードに起因する電圧
降下が発生する。
【０００５】例えば、満充電された電池の電圧が４．１
Ｖ、ダイオード７の電圧降下が０．３５Ｖとすれば、充
電制御スイッチ３と充電スイッチ４をオフにすると、組
電池１の出力電圧は３．７５Ｖ（＝４．１−０．３５
Ｖ）に低下してしまう。制御回路６を、例えば、組電池
１の出力電圧が３．８５Ｖよりも低くなるときに、充電
スイッチ４をオンに切り換えるように設計すると、この
状態で充電スイッチ４はオンになって、充電を再開する
弊害がある。すなわち、組電池１が満充電されて、充電
スイッチ４をオフに切り換えても、満充電でないと誤認
し、充電を再開することがある。
【０００６】この弊害は、制御回路６が充電スイッチ４
をオンにする再充電電圧を３．８５Ｖよりも低く設定し
て解消できる。ただ、再充電電圧を低くすると、組電池
１が相当に放電されるまで、充電を再開しなくなって、
組電池１を満充電された状態に保持できなくなる欠点が
ある。
【０００７】本発明は、この欠点を解決することを目的
に開発されたものである。本発明の重要な目的は、再充
電電圧を低く設定することなく、満充電された組電池を
誤って再充電するのを確実に防止できる組電池をパルス
充電する充電方法を提供することにある。
【０００８】
【課題を解決するための手段】本発明の組電池の充電方
法は、保護回路２を内蔵する組電池１をパルス充電し、
組電池１に内蔵される電池電圧が設定電圧まで上昇する
と、保護回路２の充電制御スイッチ３をオフに切り換え
て、電池の過充電を保護する充電方法を改良したもので
ある。
【０００９】本発明の組電池の充電方法は、組電池1を
満充電した後、組電池１の電池電圧が再充電電圧よりも
低下したときに、充電スイッチ４を複数回、一定の時間
間隔で断続的にオンにし、充電スイッチ４がオンのとき
の充電電流を検出し、充電電流が設定電流以上であると
きの回数が所定回数より多いときに限って再充電を開始
し、その他のときに充電を再開しない。
【００１０】
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。ただし、以下に示す実施の形態
は、本発明の技術思想を具体化するための充電方法を例
示するものであって、本発明は組電池をパルス充電する
充電方法を下記の方法に特定しない。
【００１１】更に、この明細書は、特許請求の範囲を理
解しやすいように、実施の形態に示される部材に対応す
る番号を、「特許請求の範囲の欄」、及び「課題を解決
するための手段の欄」に示される部材に付記している。
ただ、特許請求の範囲に示される部材を、実施の形態の
部材に特定するものでは決してない。
【００１２】本発明の充電方法は、図１に示す充電回路
を使用して組電池を充電できる。この図の充電回路は、
定電圧定電流電源５と組電池１との間に充電スイッチ４
を接続している。組電池１は保護回路２を内蔵してい
る。保護回路２は、電池の過充電を防止する充電制御ス
イッチ３を内蔵している。保護回路２の充電制御スイッ
チ３は、電池をパルス充電する充電制御スイッチに併用
される。充電制御スイッチ３がオンオフされて、電池が
パルス充電される。以下、リチウムイオン二次電池を内
蔵する組電池１の充電方法を詳述する。ただ、組電池１
は、内蔵する電池をリチウムイオン二次電池に特定しな
い。内蔵電池は、充電できるすべての二次電池８、たと
えば、ニッケルカドミウム電池やニッケル水素電池とす
ることもできる。
【００１３】充電回路は、リチウムイオン二次電池の充
電に適した電圧と電流を出力する定電圧定電流電源５
と、この定電圧定電流電源５の出力側に接続された充電
スイッチ４と、充電スイッチ４を制御する制御回路６を
備える。
【００１４】定電圧定電流電源５は、安定化して出力す
る電圧を４．２Ｖ／セルに設定する。出力電流は、たと
えば、１〜２Ｃで充電できる電流値に設定される。充電
スイッチ４は、二次電池８を急速充電するときにオン、
その他のときにオフに切り換えられる。
【００１５】制御回路６は、組電池１に内蔵される二次
電池８を急速充電するときに充電スイッチ４をオン、二
次電池８が満充電されるとオフに切り換える。制御回路
６は、組電池１の充電電流と出力電圧を検出して、充電
スイッチ４をオンオフに切り換える。
【００１６】組電池１は保護回路２を内蔵している。保
護回路２は、内蔵する二次電池８の電圧を検出して、二
次電池８の電圧が設定電圧よりも高くなると充電を休止
させる。保護回路２は、二次電池８と直列に接続された
充電制御スイッチ３と、二次電池８の電圧を検出して充
電制御スイッチ３をオンオフに制御する電圧検出回路９
とを備える。図に示す組電池１は、更に電池の過放電を
防止する放電制御スイッチ１０を備える。
【００１７】充電制御スイッチ３と放電制御スイッチ１
０はＦＥＴが最適である。ただ、充電制御スイッチ３と
放電制御スイッチ１０には、トランジスターやリレー等
も使用できる。充電制御スイッチ３や放電制御スイッチ
１０は、これらがオフの状態で、逆方向に電流を流すた
めに、ダイオード７を並列に接続している。充電制御ス
イッチ３に接続されるダイオード７は、組電池１を放電
できる方向に電流を流し、放電制御スイッチ１０に接続
されるダイオード７は、組電池１を充電できる方向に電
流を流す。
【００１８】電圧検出回路９は、電池電圧が設定電圧を
超えると、過充電を防止する充電制御スイッチ３をオフ
に切り換える。ただ、電圧検出回路９は、電池電圧が設
定電圧を超えても直ちに充電制御スイッチ３をオフに切
り換えない。電池電圧が設定電圧を超えて一定時間経過
すると、充電制御スイッチ３をオフに切り換える。電池
電圧が設定電圧を超えて、充電制御スイッチ３がオフに
なるまでの短い時間、二次電池８はパルス充電される。
二次電池８がパルス充電される時間は、充電制御スイッ
チ３がオフに切り換えられる時間で調整できる。充電制
御スイッチ３がオフになると、二次電池８は充電されな
くなって、電池の開放電圧は次第に低下する。電圧検出
回路９は、低下する電池の開放電圧を検出して、開放電
圧が設定電圧以下になると、再び充電制御スイッチ３を
オンにして二次電池８をパルス充電して満充電する。
【００１９】以上の充電回路は、図３に示すフローチャ
ートで組電池の充電を終了する。
［Ｓ１のステップ］充電スイッチ４をオン状態に保持
し、充電制御スイッチ３をオンオフに切り換えて、組電
池１をパルス充電して満充電する。組電池１が満充電さ
れると、制御回路６は、充電スイッチ４をオフに切り換
えて充電を停止し、満充電を表示する。制御回路６は、
パルス充電する休止時間を検出し、休止時間が設定時間
よりも長くなると、満充電と判断して、充電スイッチ４
をオフに切り換える。
【００２０】［Ｓ２のステップ］制御回路６が、組電池
１の出力電圧を検出して、再充電電圧（例えば３．８５
Ｖ）に比較する。組電池１の出力電圧が、再充電電圧よ
りも低い状態を２４秒以上継続するかどうかを判断し、
再充電電圧よりも低くなる時間が２４秒よりも短いと、
このステップをループする。すなわち、組電池１の出力
電圧が、再充電電圧よりも確実に低くなったかどうかを
判定する。組電池１の出力電圧が、なんらかの原因で、
一時的に低くなった状態は無視する。
【００２１】［Ｓ３のステップ］組電池１の出力電圧
が、再充電電圧よりも２４秒以上継続して低くなると、
制御回路６は充電スイッチ４をオンにして急速充電でき
る状態とする。更に、カウンターのカウント値を０にリ
セットする。カウンターは図示しないが、制御回路６に
内蔵されている。
【００２２】［Ｓ４のステップ］制御回路６は、組電池
１の充電電流を検出して、充電電流が１００ｍＡ以上か
どうかを判定する。すなわち、充電制御スイッチ３がオ
ン状態にあるかどうかを判定する。充電制御スイッチ３
がオンになっていると、電池には、１００ｍＡ以上の充
電電流が流れ、充電制御スイッチ３がオフであると、充
電電流は流れない。
［Ｓ５のステップ］充電電流が１００ｍＡ以上でない
と、制御回路６は充電スイッチ４をオフにして充電を停
止し、Ｓ２のステップにジャンプする。
【００２３】［Ｓ６、Ｓ７のステップ］組電池１の充電
電流が１００ｍＡ以上であると、カウンターのカウント
値に１をプラスし、カウンターのカウント値が３以上で
あるかどうかを判定する。
【００２４】［Ｓ８のステップ］カウンターのカウント
値が３未満であると、４００ミリ秒経過後に、Ｓ４のス
テップにジャンプする。４００ミリ秒間隔で、組電池１
の充電電流を検出する。
【００２５】［Ｓ９のステップ］カウンターのカウント
値が３以上になると、制御回路６は充電スイッチ４をオ
フに切り換えることなく、急速充電を表示して組電池１
を急速充電する。
【００２６】すなわち、組電池１が満充電されて、充電
スイッチ４をオフに切り換えて、組電池１の出力電圧が
再充電電圧である３．８５Ｖ以下に低下したとき、充電
スイッチ４をオンに切り換え、充電スイッチ４がオンの
ときの充電電流を４００ミリ秒の間隔で検出し、充電電
流が設定電流である１００ｍＡ以上となる回数が３回以
上のときに限って再充電を開始し、その他のときに充電
を停止する。
【００２７】
【発明の効果】本発明の組電池をパルス充電する充電方
法は、再充電電圧を低く設定することなく、すなわち、
組電池を満充電された状態に保持して、しかも、満充電
された組電池を誤って再充電するのを確実に防止できる
特長がある。それは、本発明の充電方法が、組電池の充
電制御スイッチがオフになって、組電池の電圧が再充電
電圧よりも低くなっても、組電池の充電制御スイッチが
オフになっている状態では再充電を再開しないからであ
る。すなわち、本発明の充電方法は、組電池の電圧が再
充電電圧よりも低くなったときに、充電スイッチをオ
ン、オフに切り換えて、オン状態における充電電流を一
定の時間間隔で複数回検出し、充電電流が設定電流より
も決められた回数多いとき、言いかえると、充電制御ス
イッチがオンになっている回数が決められた回数カウン
トされるときに限って再充電を開始する。このため、組
電池が満充電されて、充電制御スイッチがオフ状態にあ
る組電池は、その出力電圧が再充電電圧よりも低くなっ
ても、充電スイッチがオンになって再充電を再開するこ
とはない。本発明の組電池をパルス充電する充電方法
は、以上のように、組電池の出力電圧が再充電電圧より
も低くなっても、再充電を再開しないので、再充電電圧
を低く設定でき、組電池を満充電状態に保持できる特長
がある。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging method for pulse charging an assembled battery having a protection circuit for preventing overcharging of the battery. 2. Description of the Related Art A charging method for pulse-charging a battery allows rapid charging by applying a large current in a short time. FIG. 1 shows a charging circuit capable of pulse charging a battery pack having a built-in protection circuit. The protection circuit 2 of the battery pack 1 has a built-in charge control switch 3 for preventing overcharging of the battery. The charge control switch 3 can be switched on and off to be used for pulse charging. For example, this charging circuit detects the battery voltage when suspending charging of the battery, suspends charging until the battery voltage falls to the set voltage, and resumes charging when the battery voltage falls below the set voltage. Pulse charging. When the battery pack 1 is charged in this way, as shown in FIG. 2, the battery voltage and the charging current change, and the idle time becomes longer as the battery approaches full charge.
This is because a battery nearing full charge has a slow decrease in battery voltage. Therefore, the full charge can be detected by detecting the idle time of the battery. When the battery pack 1 is fully charged, the charging switch 4 connected between the constant voltage / constant current power supply 5 and the battery pack 1 is turned off to stop charging. [0004] When it is determined that the battery pack 1 is fully charged and the charge switch 4 is turned off,
Although the battery pack 1 is fully charged, the control circuit 6 that controls the charge switch 4 erroneously determines that the battery pack 1 is not fully charged, and turns on the charge switch 4 to start recharging. May be. The control circuit 6 controls the battery pack 1
Is detected to control the charging switch 4. When both the charge control switch 3 and the charge switch 4 of the battery pack 1 are turned off, the output voltage of the battery pack 1 becomes lower than the built-in battery voltage. This is because the diode 7 connected in parallel to the charge control switch 3 is connected in series with the battery and reduces the output voltage of the battery pack 1. The protection circuit 2 of the assembled battery 1 shown in FIG.
Since ET is used, a parasitic diode is connected in parallel. A transistor in which a diode is connected in parallel in the opposite direction can be used as the charge control switch 3 in place of the FET. However, in this case, when a current flows in the opposite direction to the forward direction of the transistor, a voltage drop caused by the diode is reduced. appear. For example, when the voltage of a fully charged battery is 4.1
Assuming that the voltage drop of V and the diode 7 is 0.35 V, when the charge control switch 3 and the charge switch 4 are turned off, the output voltage of the battery pack 1 becomes 3.75 V (= 4.1−0.35 V).
V). If the control circuit 6 is designed to switch on the charging switch 4 when the output voltage of the battery pack 1 becomes lower than 3.85 V, for example, the charging switch 4 is turned on in this state, and charging is started. There is evil to resume. That is, even if the battery pack 1 is fully charged and the charge switch 4 is turned off, it may be erroneously recognized that the battery is not fully charged, and charging may be restarted. [0006] The adverse effect is that the control circuit 6 controls the charging switch 4
Can be eliminated by setting the recharging voltage for turning on to be lower than 3.85V. However, if the recharge voltage is lowered, charging will not resume until the battery pack 1 is substantially discharged,
There is a disadvantage that the assembled battery 1 cannot be held in a fully charged state. The present invention has been developed to solve this drawback. An important object of the present invention is to provide a charging method for pulse-charging an assembled battery that can reliably prevent a fully charged assembled battery from being erroneously recharged without setting a low recharging voltage. . According to the present invention, there is provided a method for charging a battery pack, comprising the steps of pulse-charging a battery pack having a protection circuit therein.
When the battery voltage built in the battery pack 1 rises to a set voltage, the charging control switch 3 of the protection circuit 2 is turned off to improve the charging method for protecting the battery from overcharging. In the method for charging a battery pack according to the present invention, the battery pack 1 is
After the battery is fully charged, when the battery voltage of the battery pack 1 drops below the recharge voltage, the charge switch 4 is turned on several times intermittently at fixed time intervals, and the charge current when the charge switch 4 is turned on. detects, when a charging current is a set current or
Recharging is started only when the number of times of charging is greater than a predetermined number of times, and charging is not restarted at other times. Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a charging method for embodying the technical idea of the present invention, and the present invention does not specify a charging method for pulse-charging an assembled battery to the following method. Further, in this specification, in order to make it easier to understand the claims, the numbers corresponding to the members described in the embodiments will be referred to as "claims" and " In the column of “Means of the above”.
However, the members described in the claims are not limited to the members of the embodiments. According to the charging method of the present invention, a battery pack can be charged using the charging circuit shown in FIG. The charging circuit in this figure
Charge switch 4 between constant voltage / constant current power supply 5 and battery pack 1
Are connected. The battery pack 1 has a built-in protection circuit 2. The protection circuit 2 has a built-in charge control switch 3 for preventing the battery from being overcharged. The charge control switch 3 of the protection circuit 2 is used in combination with a charge control switch for pulse-charging the battery. The charge control switch 3 is turned on and off, and the battery is pulse-charged. Hereinafter, a method of charging the battery pack 1 including the lithium ion secondary battery will be described in detail. However, battery pack 1
Does not specify a built-in battery as a lithium ion secondary battery. The built-in battery may be any rechargeable battery 8 that can be charged, for example, a nickel cadmium battery or a nickel metal hydride battery. The charging circuit includes a constant-voltage / constant-current power supply 5 for outputting a voltage and a current suitable for charging a lithium ion secondary battery.
A charge switch 4 connected to the output side of the constant-voltage / constant-current power supply 5; and a control circuit 6 for controlling the charge switch 4. The constant-voltage / constant-current power supply 5 sets the stabilized output voltage to 4.2 V / cell. The output current is set, for example, to a current value that allows charging at 1 to 2C. The charge switch 4 is turned on when the secondary battery 8 is rapidly charged,
It is switched off at other times. The control circuit 6 turns on the charge switch 4 when the secondary battery 8 incorporated in the battery pack 1 is rapidly charged, and switches off when the secondary battery 8 is fully charged. The control circuit 6 detects the charging current and the output voltage of the battery pack 1 and switches the charging switch 4 on and off. The battery pack 1 has a built-in protection circuit 2. The protection circuit 2 detects the voltage of the built-in secondary battery 8 and suspends charging when the voltage of the secondary battery 8 becomes higher than a set voltage. The protection circuit 2 includes a charge control switch 3 connected in series with the secondary battery 8 and a voltage detection circuit 9 that detects the voltage of the secondary battery 8 and controls the charge control switch 3 to be turned on and off.
And The battery pack 1 shown in the figure further includes a discharge control switch 10 for preventing overdischarge of the battery. Charge control switch 3 and discharge control switch 1
0 indicates that the FET is optimal. However, transistors and relays can be used for the charge control switch 3 and the discharge control switch 10. The charge control switch 3 and the discharge control switch 10 are connected in parallel with a diode 7 in order to allow current to flow in the reverse direction when they are off. The diode 7 connected to the charge control switch 3 allows current to flow in a direction in which the battery pack 1 can be discharged, and the diode 7 connected to the discharge control switch 10 allows current to flow in a direction in which the battery pack 1 can be charged. When the battery voltage exceeds the set voltage, the voltage detection circuit 9 switches off the charge control switch 3 for preventing overcharging. However, the voltage detection circuit 9 does not immediately switch off the charge control switch 3 even when the battery voltage exceeds the set voltage. When a certain period of time has elapsed after the battery voltage exceeds the set voltage, the charge control switch 3 is turned off. The rechargeable battery 8 is pulse-charged for a short time until the battery voltage exceeds the set voltage and the charge control switch 3 is turned off.
The time during which the secondary battery 8 is pulse-charged can be adjusted by the time during which the charge control switch 3 is turned off. When the charge control switch 3 is turned off, the secondary battery 8 is no longer charged, and the open voltage of the battery gradually decreases. The voltage detecting circuit 9 detects the decreasing open voltage of the battery, and when the open voltage becomes equal to or lower than the set voltage, turns on the charge control switch 3 again to charge the secondary battery 8 by pulse charging to full charge. The above-described charging circuit terminates the charging of the assembled battery according to the flowchart shown in FIG. [Step S1] The charge switch 4 is kept on, the charge control switch 3 is turned on and off, and the battery pack 1 is pulse-charged to full charge. When the battery pack 1 is fully charged, the control circuit 6 switches off the charge switch 4 to stop charging, and displays a full charge. The control circuit 6
The pause time for pulse charging is detected, and when the pause time is longer than the set time, it is determined that the battery is fully charged, and the charge switch 4 is turned on.
Switch off. [Step S2] The control circuit 6 detects the output voltage of the battery pack 1 and recharges the voltage (for example, 3.85).
V). It is determined whether or not the output voltage of the battery pack 1 continues to be lower than the recharge voltage for at least 24 seconds.
If the time that the voltage is lower than the recharge voltage is shorter than 24 seconds,
Loop this step. That is, it is determined whether or not the output voltage of the battery pack 1 has certainly become lower than the recharge voltage. The output voltage of the battery pack 1 may be
Ignore the temporarily lowered state. [Step S3] When the output voltage of the battery pack 1 continuously becomes lower than the recharge voltage for 24 seconds or more,
The control circuit 6 turns on the charge switch 4 so that rapid charging can be performed. Further, the count value of the counter is reset to zero. Although not shown, the counter is built in the control circuit 6. [Step S4] The control circuit 6 detects the charging current of the battery pack 1 and determines whether the charging current is 100 mA or more. That is, it is determined whether or not the charge control switch 3 is on. Charge control switch 3
Is on, a charging current of 100 mA or more flows through the battery, and when the charging control switch 3 is off, no charging current flows. [Step S5] If the charging current is not 100 mA or more, the control circuit 6 turns off the charging switch 4 to stop charging, and jumps to the step S2. [Steps S6 and S7] When the charging current of the battery pack 1 is 100 mA or more, 1 is added to the count value of the counter, and it is determined whether the count value of the counter is 3 or more. [Step S8] If the count value of the counter is less than 3, the process jumps to the step S4 after elapse of 400 milliseconds. At 400 millisecond intervals, battery pack 1
To detect the charging current. [Step S9] When the count value of the counter becomes 3 or more, the control circuit 6 displays the quick charge without switching off the charge switch 4 and displays the battery pack 1
To charge quickly. That is, when the battery pack 1 is fully charged and the charge switch 4 is turned off, and the output voltage of the battery pack 1 falls below the recharge voltage of 3.85 V, the charge switch 4 is turned on. The charging current when the charging switch 4 is turned on is detected at intervals of 400 milliseconds, and recharging is started only when the number of times that the charging current becomes 100 mA or more, which is the set current, is 3 times or more. Stop charging when. According to the charging method of the present invention for charging a battery pack by pulse charging, the recharging voltage is not set low, that is,
There is a feature that the assembled battery can be held in a fully charged state, and that the fully charged assembled battery can be reliably prevented from being erroneously recharged. That is, even if the charge control switch of the battery pack is turned off and the voltage of the battery pack becomes lower than the recharge voltage, the charge control switch of the battery pack is turned off. This is because recharging is not restarted. That is, the charging method of the present invention switches the charging switch on and off when the voltage of the battery pack becomes lower than the recharging voltage, and detects the charging current in the on state a plurality of times at regular time intervals. Recharging is started only when the charging current is larger than the set current by a predetermined number of times, in other words, when the number of times that the charge control switch is turned on is counted by the predetermined number of times. For this reason, even when the battery pack is fully charged and the charge control switch is in the off state, the charge switch is turned on and recharge is resumed even if the output voltage is lower than the recharge voltage. There is no. As described above, the charging method of the present invention for pulse-charging the assembled battery does not restart the recharging even if the output voltage of the assembled battery becomes lower than the recharging voltage. There is a feature that the battery can be maintained in a fully charged state.
【図面の簡単な説明】
【図１】組電池をパルス充電できる充電回路を示す回路
図
【図２】電池電圧と充電電流の時間変化を示すグラフ
【図３】本発明の充電方法で組電池を充電する過程を示
すフローチャート
【符号の説明】
１…組電池
２…保護回路
３…充電制御スイッチ
４…充電スイッチ
５…定電圧定電流電源
６…制御回路
７…ダイオード
８…二次電池
９…電圧検出回路
１０…放電制御スイッチBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a charging circuit capable of pulse-charging an assembled battery. FIG. 2 is a graph showing a change over time in battery voltage and charging current. [Description of References] 1… A battery pack 2… A protection circuit 3… A charge control switch 4… A charge switch 5… A constant voltage constant current power supply 6… A control circuit 7… A diode 8… A secondary battery 9… Voltage detection circuit 10: discharge control switch
Claims (1)
ス充電し、組電池(1)に内蔵される電池電圧が設定電圧
まで上昇すると、保護回路(2)の充電制御スイッチ(3)を
オフに切り換えて、電池の過充電を保護する組電池をパ
ルス充電する充電方法において、組電池(1)を満充電し
た後、組電池(1)の電池電圧が再充電電圧よりも低下し
たときに、充電スイッチ(4)をオン、オフに切り換え、
充電スイッチ(4)がオンのときの充電電流を一定の時間
間隔で複数回検出し、充電電流が設定電流以上であると
きの回数が所定回数より多いときに限って再充電を開始
し、その他のときに充電を停止することを特徴とする組
電池をパルス充電する充電方法。(57) [Claims] [Claim 1] When the battery pack (1) including the protection circuit (2) is pulse-charged and the battery voltage built in the battery pack (1) rises to a set voltage, In the charging method in which the charge control switch (3) of the protection circuit (2) is turned off to pulse-charge the battery pack to protect the battery from being overcharged, the battery pack (1) is fully charged.
After that, when the battery voltage of the assembled battery (1) falls below the recharge voltage, the charge switch (4) is turned on and off ,
Detecting a plurality of times the charging current when charging switch (4) is on at a predetermined time interval, if it is the charging current is a set current or
A charging method for pulse charging a battery pack, wherein recharging is started only when the number of times of charging is greater than a predetermined number of times, and charging is stopped at other times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13535496A JP3433000B2 (en) | 1996-05-29 | 1996-05-29 | Charge method for pulse charging of assembled batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13535496A JP3433000B2 (en) | 1996-05-29 | 1996-05-29 | Charge method for pulse charging of assembled batteries |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09322421A JPH09322421A (en) | 1997-12-12 |
| JP3433000B2 true JP3433000B2 (en) | 2003-08-04 |
Family
ID=15149799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13535496A Expired - Fee Related JP3433000B2 (en) | 1996-05-29 | 1996-05-29 | Charge method for pulse charging of assembled batteries |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3433000B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5322395B2 (en) * | 2007-02-27 | 2013-10-23 | 三洋電機株式会社 | How to charge the battery pack |
| JP5652562B1 (en) * | 2013-09-19 | 2015-01-14 | 株式会社豊田自動織機 | MOSFET switch element abnormality diagnosis apparatus and method |
-
1996
- 1996-05-29 JP JP13535496A patent/JP3433000B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09322421A (en) | 1997-12-12 |
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