JPH06133467A - Charger - Google Patents
ChargerInfo
- Publication number
- JPH06133467A JPH06133467A JP4274264A JP27426492A JPH06133467A JP H06133467 A JPH06133467 A JP H06133467A JP 4274264 A JP4274264 A JP 4274264A JP 27426492 A JP27426492 A JP 27426492A JP H06133467 A JPH06133467 A JP H06133467A
- Authority
- JP
- Japan
- Prior art keywords
- current
- charging
- secondary battery
- current value
- time
- 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
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、二次電池、特にリチウ
ムイオン二次電池等の非水系二次電池を定電圧充電する
充電器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charger for charging a secondary battery, especially a non-aqueous secondary battery such as a lithium ion secondary battery, with a constant voltage.
【0002】[0002]
【従来の技術】繰り返し充電することにより複数回にわ
たって使用できる二次電池の中で、特にリチウムイオン
二次電池は、ニッケルカドミウム電池に比べて電圧が約
3倍も高く、しかも高容量である性質を有し、最近注目
されている。2. Description of the Related Art Among rechargeable batteries that can be used over and over by being repeatedly charged, a lithium-ion rechargeable battery, in particular, has a voltage about three times higher than that of a nickel-cadmium battery and a high capacity. Has recently been attracting attention.
【0003】ところで、斯る二次電池は、所定の電圧を
越えて過充電を行うと電池性能が低下してしまう。そこ
で、リチウムイオン二次電池では、所定電圧を越えて充
電されることがないように、通常、定電流・定電圧充電
が行われる。即ち、充電初期には定電流充電を行い、電
池電圧が設定値に近くなると、定電圧充電に切り替えて
いる(例えば、特開平4−183232号公報等参
照)。そして、充電電流がほぼ0になるか、あるいは所
定時間経過すると、満充電表示を行い、充電を終了す
る。By the way, the performance of such a secondary battery is deteriorated when it is overcharged beyond a predetermined voltage. Therefore, in the lithium ion secondary battery, constant current / constant voltage charging is usually performed so that the lithium ion secondary battery is not charged above a predetermined voltage. That is, constant current charging is performed at the initial stage of charging, and when the battery voltage is close to the set value, switching to constant voltage charging is performed (see, for example, JP-A-4-183232). Then, when the charging current becomes almost 0 or when a predetermined time elapses, the full charge is displayed and the charging is finished.
【0004】[0004]
【発明が解決しようとする課題】ところで、二次電池の
充電特性は、充電中の周囲温度により影響を受ける。図
3は、リチウムイオン二次電池において、周囲温度が0
℃、25℃及び60℃の場合の充電電流−充電時間の特
性を示している。By the way, the charging characteristics of the secondary battery are affected by the ambient temperature during charging. FIG. 3 shows that the ambient temperature is zero in a lithium ion secondary battery.
The characteristics of charging current-charging time in the case of C, 25 C and 60 C are shown.
【0005】同図から分かるように、充電時の周囲温度
により、満充電となって充電電流がほぼ0に収束するま
での時間は、大きく異なる。特に、低温(例えば、0
℃)状態で充電すると、充電電流がほぼ0に収束するま
での時間が非常に長くなる。その結果、ほぼ満充電とな
っているにも係わらず、長期にわたって満充電の表示が
なされず、非常に使い勝手がよくない。As can be seen from the figure, the time required for the charging current to reach full charge and to converge to almost zero depends on the ambient temperature during charging. Especially at low temperatures (eg 0
If the battery is charged in the (.degree. C.) state, the time until the charging current converges to almost 0 becomes very long. As a result, even though the battery is almost fully charged, the display of the fully charged battery is not displayed for a long period of time, which is not very convenient.
【0006】また、所定時間経過後に満充電表示する場
合には、充電時の周囲温度での充電特性が異なるため
に、満充電表示時点での充電量にバラツキが生じる。Further, when the full charge display is performed after a lapse of a predetermined time, the charge amount at the full charge display time varies because the charge characteristics at ambient temperature during charging are different.
【0007】そこで、本発明の目的は、充電時の周囲温
度に関係なく、適切に満充電表示を行うことにある。Therefore, an object of the present invention is to properly perform full-charge display regardless of the ambient temperature during charging.
【0008】[0008]
【課題を解決するための手段】本発明は、二次電池を定
電圧充電する充電器において、前記二次電池の充電電流
を検出する電流検出手段と、この電流検出手段により検
出された充電電流が第1の電流値から、この第1の電流
値より低い第2の電流値に低下するまでの所要時間に応
じて、満充電表示を行うまでの時間を算出する算出手段
とを備えたことを特徴とする。According to the present invention, in a charger for charging a secondary battery with a constant voltage, a current detecting means for detecting a charging current of the secondary battery and a charging current detected by the current detecting means. And a calculating means for calculating a time until a full-charge display is performed according to a time required to decrease from a first current value to a second current value lower than the first current value. Is characterized by.
【0009】[0009]
【作用】本発明によれば、充電電流が第1の電流値から
この第1の電流値より低い第2の電流値に低下するまで
の所要時間を認識することにより、間接的に充電中の二
次電池の周囲温度を、あるいは二次電池の容量を間接的
に測定する。そして、斯る所要時間に応じて、満充電表
示を行うまでの時間を算出し、適切な満充電表示を行
う。According to the present invention, by recognizing the time required for the charging current to decrease from the first current value to the second current value lower than the first current value, it is possible to indirectly charge the battery. The ambient temperature of the secondary battery or the capacity of the secondary battery is indirectly measured. Then, according to the required time, the time until the full-charge display is performed is calculated, and the appropriate full-charge display is performed.
【0010】[0010]
【実施例】図1は本発明の一実施例を示すブロック回路
図であり、1はRAM、充電制御プログラムや種々の充
電条件を記憶するROM、マイクロコンピュータ及びそ
の他の周辺回路を備えた制御部、2はリチウムイオン二
次電池(以下、単に二次電池という)、3は商用電源
(図示していない)からの交流を受け、二次電池2に定
電流・定電圧の充電電力を供給する電源部、4は電源部
3からの電力を受け、二次電池2の電圧が所定電圧(例
えば、4.1V)になるまで、二次電池2に1C〜2C
の定電流を供給し、所定電圧到達後、二次電池2に4.
1Vの定電圧を供給する充電制御部、5は二次電池2の
充電電流Iを検出する電流検出部、6は充電の開始時か
ら時間のカウントを開始するタイマー回路、7はLED
及びその駆動回路からなり、満充電表示時間になると、
満充電を表示する充電表示部である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block circuit diagram showing an embodiment of the present invention, in which 1 is a control unit having a RAM, a ROM for storing a charging control program and various charging conditions, a microcomputer and other peripheral circuits. Reference numeral 2 denotes a lithium ion secondary battery (hereinafter, simply referred to as a secondary battery), 3 receives alternating current from a commercial power source (not shown), and supplies the secondary battery 2 with constant-current / constant-voltage charging power. The power source unit 4 receives the power from the power source unit 3, and the secondary battery 2 receives 1C to 2C until the voltage of the secondary battery 2 reaches a predetermined voltage (for example, 4.1V).
3. The constant current is supplied to the secondary battery 2 after reaching a predetermined voltage.
A charge control unit that supplies a constant voltage of 1 V, 5 a current detection unit that detects a charging current I of the secondary battery 2, 6 a timer circuit that starts counting time from the start of charging, and 7 an LED
And its drive circuit, when full charge display time,
It is a charge display unit that displays a full charge.
【0011】図2は本発明の一実施例の動作を示すフロ
ーチャートである。ステップS1において、充電が開始
される。同時に、ステップS2において、タイマー回路
6はカウントを開始する。充電開始に伴い、充電制御部
4は、まず二次電池2の定電流充電を行い、二次電池2
が所定電圧に達すると、定電圧充電を行う。FIG. 2 is a flow chart showing the operation of one embodiment of the present invention. In step S1, charging is started. At the same time, in step S2, the timer circuit 6 starts counting. With the start of charging, the charge control unit 4 first performs constant-current charging of the secondary battery 2, and then the secondary battery 2
Reaches a predetermined voltage, constant voltage charging is performed.
【0012】ステップS3において、電流検出部5によ
り検出される充電電流Iが、第1の電流値I1にまで低
下したか否かが判断される。今、第1の電流値I1にな
ったと判断されると、ステップS4において、その時の
タイマー回路6の第1のカウント値t1が読み出され、
制御部1に一旦記憶される。In step S3, it is determined whether the charging current I detected by the current detector 5 has dropped to the first current value I1. Now, when it is determined that the first current value I1 is reached, in step S4, the first count value t1 of the timer circuit 6 at that time is read out,
It is temporarily stored in the control unit 1.
【0013】続いて、ステップS5において、電流検出
部5により検出される充電電流Iが、第1の電流値I1
から第2の電流値I2にまで低下したか否かが判断され
る。今、第2の電流値I2になったと判断されると、ス
テップS6において、その時のタイマー回路6の第2の
カウント値t2が読み出され、制御部1に一旦記憶され
る。Then, in step S5, the charging current I detected by the current detector 5 is the first current value I1.
To the second current value I2 is determined. When it is determined that the second current value I2 has been reached, the second count value t2 of the timer circuit 6 at that time is read out and temporarily stored in the control unit 1 in step S6.
【0014】上記カウント値t2が読み出されると、ス
テップS7において、制御部1は満充電の表示を行う時
間t3を、t3=t2+a(t2−t1)の算出式にて
算出する。なお、aは任意の定数(例えば、3)であ
る。When the count value t2 is read, in step S7, the control unit 1 calculates the time t3 for displaying the full charge by the calculation formula of t3 = t2 + a (t2-t1). In addition, a is an arbitrary constant (for example, 3).
【0015】ここで、(t2−t1)は、充電電流Iが
第1の電流値I1から第2の電流値I2にまで低下する
に要した時間であり、この時間は、記述の如く、周囲温
度が高いほど短くなる。その結果、上述の算出式にて算
出される満充電の表示時間t3は、周囲温度が高いほど
短くなり、換言すれば、周囲温度が高くなるほど満充電
に達する時間が短くなる二次電池2の特性に応じ、適宜
の時間に設定される。Here, (t2-t1) is the time required for the charging current I to drop from the first current value I1 to the second current value I2, and this time is the ambient time as described. The higher the temperature, the shorter it becomes. As a result, the full-charge display time t3 calculated by the above-described calculation formula becomes shorter as the ambient temperature becomes higher, in other words, the time to reach full charge becomes shorter as the ambient temperature becomes higher. The time is set appropriately according to the characteristics.
【0016】そして、ステップS8において、タイマー
回路6のカウント値が上述で算出されたt3に達したか
否かが判断され、t3に達したと判断されると、ステッ
プS9において、充電表示部7に満充電になったことが
表示される。Then, in step S8, it is determined whether or not the count value of the timer circuit 6 has reached t3 calculated above. If it is determined that t3 has been reached, the charge display section 7 is displayed in step S9. It will be displayed that the battery is fully charged.
【0017】[0017]
【発明の効果】本発明によれば、二次電池を定電圧充電
する充電器において、前記二次電池の充電電流を検出す
る電流検出手段と、この電流検出手段により検出された
充電電流が第1の電流値から、この第1の電流値より低
い第2の電流値に低下するまでの所要時間に応じて、満
充電表示を行うまでの時間を算出する算出手段とを備え
ているので、周囲温度を測定しないにも係わらず、周囲
温度に影響を受けることなく、適切な満充電表示を行う
ことができる。According to the present invention, in the charger for charging the secondary battery with a constant voltage, the current detecting means for detecting the charging current of the secondary battery and the charging current detected by the current detecting means are Since there is provided a calculating means for calculating the time until the full-charge display is performed according to the time required from the current value of 1 to the second current value lower than the first current value, Even though the ambient temperature is not measured, an appropriate full-charge display can be displayed without being affected by the ambient temperature.
【図1】本発明の一実施例を示すブロック回路図であ
る。FIG. 1 is a block circuit diagram showing an embodiment of the present invention.
【図2】本発明の一実施例の動作を示すフローチャート
図である。FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.
【図3】二次電池の充電特性を示す特性図である。FIG. 3 is a characteristic diagram showing charging characteristics of a secondary battery.
1 制御部 2 二次電池 5 電流検出部 6 タイマー回路 7 充電表示部 1 control unit 2 secondary battery 5 current detection unit 6 timer circuit 7 charging display unit
Claims (1)
て、前記二次電池の充電電流を検出する電流検出手段
と、この電流検出手段により検出された充電電流が第1
の電流値から、この第1の電流値より低い第2の電流値
に低下するまでの所要時間に応じて、満充電表示を行う
までの時間を算出する算出手段とを備えたことを特徴と
する充電器。1. In a charger for charging a secondary battery with a constant voltage, a current detecting means for detecting a charging current of the secondary battery and a charging current detected by the current detecting means are first
And a calculation unit that calculates a time until a full charge display is performed according to a time required from the current value of 1 to a second current value lower than the first current value. Charger to do.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27426492A JP3286357B2 (en) | 1992-10-13 | 1992-10-13 | Charger |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27426492A JP3286357B2 (en) | 1992-10-13 | 1992-10-13 | Charger |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06133467A true JPH06133467A (en) | 1994-05-13 |
JP3286357B2 JP3286357B2 (en) | 2002-05-27 |
Family
ID=17539253
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27426492A Expired - Fee Related JP3286357B2 (en) | 1992-10-13 | 1992-10-13 | Charger |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3286357B2 (en) |
-
1992
- 1992-10-13 JP JP27426492A patent/JP3286357B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP3286357B2 (en) | 2002-05-27 |
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