JPH07245884A - Battery charger and charging method - Google Patents
Battery charger and charging methodInfo
- Publication number
- JPH07245884A JPH07245884A JP6032289A JP3228994A JPH07245884A JP H07245884 A JPH07245884 A JP H07245884A JP 6032289 A JP6032289 A JP 6032289A JP 3228994 A JP3228994 A JP 3228994A JP H07245884 A JPH07245884 A JP H07245884A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- charged
- voltage
- battery voltage
- charging
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は充電を行うことにより再
使用可能な被充電電池の充電器及び被充電電池の充電方
法に関し、特に、被充電電池と並列に負荷が接続された
フローティング充電に適用されて好適である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charger for a rechargeable battery which can be reused by charging and a method for charging the rechargeable battery, and more particularly to floating charging in which a load is connected in parallel with the rechargeable battery. It is suitable to be applied.
【０００２】[0002]
【従来の技術】負荷が並列に接続された状態で被充電電
池を充電する、所謂フローティング充電において、一旦
満充電とされた被充電電池は、負荷が駆動されたとして
も充電器にセットされている限り、満充電状態を維持す
るようにしておくのが好ましい。このために、例えば、
特公平４−２４９３７号公報においては、被充電電池の
満充電後、被充電電池の電池電圧を検出し、この電池電
圧が所定電圧値まで低下すると、被充電電池を急速に再
充電して、被充電電池の満充電状態を維持するようにし
ている。2. Description of the Related Art In so-called floating charging, in which a battery to be charged is charged in a state where loads are connected in parallel, a battery to be fully charged is set in a charger even if the load is driven. As long as there is, it is preferable to keep the fully charged state. To do this, for example,
In Japanese Patent Publication No. 4-24937, after the charged battery is fully charged, the battery voltage of the charged battery is detected, and when the battery voltage drops to a predetermined voltage value, the charged battery is rapidly recharged. The charged battery is kept fully charged.
【０００３】[0003]
【発明が解決しようとする課題】ところで、被充電電池
の電池電圧は周囲温度に依存して変動する。そこで、前
述の公報に記載された技術にあっては、周囲温度に応じ
て、前記所定電圧を補償するように構成している。しか
し、電池温度の温度依存特性が個々の被充電電池により
異なるため、全ての被充電電池に最適に温度補償を行う
ことは、非常に困難である。The battery voltage of the battery to be charged fluctuates depending on the ambient temperature. Therefore, in the technique described in the above publication, the predetermined voltage is compensated according to the ambient temperature. However, it is very difficult to optimally perform temperature compensation on all the batteries to be charged, because the temperature dependence of the battery temperature varies depending on the individual batteries to be charged.
【０００４】更に、前記所定電圧を適宜に設定すること
も非常に困難である。即ち、前記所定電圧を余り高い値
に設定してしまうと、被充電電池が常に再充電されて被
充電電池を劣化させてしまう。逆に低い値に設定してし
まうと、被充電電池の再充電がなかなか行われなくな
り、被充電電池を常時満充電状態に維持する機能が失わ
れてしまう。Furthermore, it is very difficult to set the predetermined voltage appropriately. That is, if the predetermined voltage is set to a value that is too high, the battery to be charged is constantly recharged and the battery to be charged is deteriorated. On the contrary, if the value is set to a low value, the rechargeable battery is hardly recharged, and the function of always maintaining the rechargeable battery in the fully charged state is lost.
【０００５】そこで、本発明は、負荷接続による被充電
電池の電圧低下を確実に検出して、被充電電池の再充電
を行い、被充電電池の満充電状態を確実に維持するよう
にするものである。Therefore, the present invention surely detects the voltage drop of the battery to be charged due to load connection, recharges the battery to be charged, and surely maintains the fully charged state of the battery to be charged. Is.
【０００６】[0006]
【課題を解決するための手段】本発明に充電器は、被充
電電池の満充電を検出して前記被充電電池の充電を制御
する満充電検出手段と、前記被充電電池の満充電検出
後、前記被充電電池の電池電圧の変化率を検出する電圧
変化率検出手段と、前記変化率が所定値以上であること
が検出されると、前記被充電電池を再充電する再充電手
段とを備えたことを特徴としている。SUMMARY OF THE INVENTION A charger according to the present invention comprises a full-charge detecting means for detecting full charge of a battery to be charged and controlling charging of the battery to be charged; A voltage change rate detecting means for detecting a change rate of the battery voltage of the charged battery, and a recharging means for recharging the charged battery when the change rate is detected to be a predetermined value or more. It is characterized by having.
【０００７】更に、本発明の被充電電池の充電方法は、
被充電電池の満充電を検出して前記被充電電池の充電を
制御した後、前記被充電電池の電池電圧の変化率を検出
し、当該検出率が所定値以上であることが検出される
と、前記被充電電池を再充電することを特徴としてい
る。Furthermore, the charging method of the battery to be charged of the present invention is
After detecting the full charge of the battery to be charged and controlling the charging of the battery to be charged, the rate of change of the battery voltage of the battery to be charged is detected, and it is detected that the detection rate is a predetermined value or more. The rechargeable battery is recharged.
【０００８】[0008]
【作用】本発明によれば、被充電電池の満充電を検出し
て前記被充電電池の充電を制御した後、被充電電池の電
池電圧を検出してその変化率を算出する。そして、被充
電電池の電池電圧の変化率が所定値以上であること、即
ち、被充電電池に負荷が接続されて被充電電池の電池電
圧が低下したことが検出されると、被充電電池を再充電
して被充電電池の容量低下分を充電し、被充電電池の満
充電状態を維持する。According to the present invention, after detecting the full charge of the battery to be charged and controlling the charging of the battery to be charged, the battery voltage of the battery to be charged is detected and the rate of change thereof is calculated. When the rate of change of the battery voltage of the battery to be charged is equal to or higher than a predetermined value, that is, when it is detected that the load is connected to the battery to be charged and the battery voltage of the battery to be charged is detected, Recharge to charge the reduced capacity of the battery to be charged and maintain the fully charged state of the battery to be charged.
【０００９】[0009]
【実施例】図１は本発明を示すブロック回路図である。
１はＡＣ１００Ｖの商用電源を入力して所望の直流電
圧、直流電流を生成するＡＣ／ＤＣ変換器、２はＡＣ／
ＤＣ変換器１からの直流電流を受け、急速充電電流（例
えば、６００ｍＡ）とトリクル充電電流（例えば、３０
ｍＡ）とを選択的に供給する充電電流制御回路、３は充
電電流制御回路２からの充電電流を受けて充電される被
充電電池であり、例えば６００ｍＡｈの容量を有するニ
ッケルカドミウム電池からなる。４はスイッチＳＷを介
して被充電電池に接続された負荷である。負荷４が例え
ば携帯用電話からなる場合、この負荷４に被充電電池３
が装着される。1 is a block circuit diagram showing the present invention.
1 is an AC / DC converter for inputting a commercial power supply of AC 100 V to generate a desired DC voltage and DC current, and 2 is an AC / DC converter.
The direct current from the DC converter 1 is received, and the rapid charging current (eg, 600 mA) and the trickle charging current (eg, 30 mA) are received.
and a charging current control circuit 3 for selectively supplying the charging current control circuit 2 and the charging current control circuit 3 are charged batteries that are charged by receiving the charging current from the charging current control circuit 2, and are, for example, nickel cadmium batteries having a capacity of 600 mAh. Reference numeral 4 is a load connected to the battery to be charged via the switch SW. When the load 4 is, for example, a mobile phone, the load 4 is charged by the battery 3 to be charged.
Is installed.
【００１０】５は被充電電池３の電池電圧を検出する電
池電圧検出回路、６は電池電圧検出部５にて任意のとき
に検出された電池電圧Ｖ１を保持する第１電池電圧保持
回路、７は電池電圧Ｖ１の検出時より所定時間（Δｔ
秒）経過後に検出された電池電圧Ｖ２を保持する第２電
池電圧保持回路、８は第１及び第２電池電圧保持回路６
及び７内に保持されている電池電圧Ｖ１及びＶ２に基づ
いて、電池電圧の変化率（即ち、−ΔＶ（＝Ｖ１−Ｖ
２）／Δｔ）を算出する−ΔＶ／Δｔ演算回路、９は所
定の遅延時間を計時する遅延タイマ回路、１０は第１及
び第２電池電圧保持回路６及び７と、演算回路８と、遅
延タイマ回路９との動作の制御、並びに充電電流制御回
路２の動作の制御を行う充電制御部である。Reference numeral 5 is a battery voltage detection circuit for detecting the battery voltage of the battery 3 to be charged, 6 is a first battery voltage holding circuit for holding the battery voltage V1 detected by the battery voltage detection unit 5 at any time, 7 Is a predetermined time (Δt
Second battery voltage holding circuit that holds the battery voltage V2 detected after a lapse of a second), and 8 is the first and second battery voltage holding circuits 6
Based on the battery voltages V1 and V2 held in 7 and 7, the rate of change of the battery voltage (ie, -ΔV (= V1-V
2) / Δt) is calculated-ΔV / Δt arithmetic circuit, 9 is a delay timer circuit that measures a predetermined delay time, 10 is the first and second battery voltage holding circuits 6 and 7, an arithmetic circuit 8, and a delay The charge control unit controls the operation of the timer circuit 9 and the operation of the charging current control circuit 2.
【００１１】斯る構成において、本発明は、被充電電池
３の満充電を検出して被充電電池３の充電を制御した
後、被充電電池３の満充電状態を維持することを特徴と
するものであり、被充電電池３の満充電を検出して被充
電電池３の充電を制御する方式については、従来より周
知の−ΔＶ検出方式または特開昭６３−１９０５２５号
公報等に開示されたピーク電圧検出方式により行う。従
って、満充電検出動作についての詳細な説明は省略する
が、ピーク電圧検出方式について簡単に述べると、ま
ず、被充電電池３に対して、充電電流制御回路２より急
速充電電流を供給し、被充電電池３を急速充電する。こ
の状態において、電池電圧検出回路５は被充電電池３の
電池電圧を検出している。そして、被充電電池３の充電
時間−電池電圧特性曲線において、電池電圧が所定電圧
上昇するに要する時間を随時測定し、この時間が前回測
定した時間より大となった時点で満充電とし、充電電流
をトリクル充電電流とする。In such a configuration, the present invention is characterized in that the fully charged state of the battery 3 to be charged is maintained after detecting the full charge of the battery 3 to be charged and controlling the charging of the battery 3 to be charged. The method of detecting the full charge of the battery 3 to be charged and controlling the charging of the battery 3 to be charged has been disclosed in the conventionally known -ΔV detection method or JP-A-63-190525. The peak voltage detection method is used. Therefore, although the detailed description of the full-charge detection operation is omitted, the peak voltage detection method will be briefly described. First, the charging current control circuit 2 supplies a rapid charging current to the battery 3 to be charged, The rechargeable battery 3 is rapidly charged. In this state, the battery voltage detection circuit 5 detects the battery voltage of the battery 3 to be charged. Then, in the charging time-battery voltage characteristic curve of the battery to be charged 3, the time required for the battery voltage to rise by a predetermined voltage is measured at any time, and when this time becomes longer than the previously measured time, the battery is fully charged and charged. Let the current be the trickle charge current.
【００１２】こうして、被充電電池３が満充電状態とさ
れると、図２に示すフローチャートに基づいて制御が行
われる。ステップＳ１、Ｓ２において、被充電電池３の
満充電検出後、所定の遅延時間（例えば、５分間）が経
過したか否かが検出される。被充電電池３の電圧は、図
３に示すように、満充電検出後急速に低下して平衡電圧
となる特性を有し、この初期の電圧低下特性は、本発明
で検出する電池電圧変化率と同様の特性を有している。
そこで、この初期の電圧低下特性を本発明における電池
電圧変化率として誤検出しないように、前述の遅延時間
が設けられている。In this way, when the battery 3 to be charged is fully charged, control is performed based on the flowchart shown in FIG. In steps S1 and S2, it is detected whether or not a predetermined delay time (for example, 5 minutes) has elapsed after detecting the full charge of the battery 3 to be charged. As shown in FIG. 3, the voltage of the battery 3 to be charged has a characteristic of rapidly decreasing to a balanced voltage after detection of full charge, and this initial voltage decreasing characteristic is the rate of change in battery voltage detected by the present invention. It has the same characteristics as.
Therefore, the delay time is provided so that the initial voltage drop characteristic is not erroneously detected as the battery voltage change rate in the present invention.
【００１３】所定の遅延時間が経過すると、ステップＳ
３において、所手時間経過直後の被充電電池３の電池電
圧（即ち、被充電電池３の平衡電圧）の値Ｖｋが読み取
られて記憶される。この電池電圧Ｖｋは、以後被充電電
池３を再充電するときの基準電圧となるものである。When the predetermined delay time has elapsed, step S
3, the value Vk of the battery voltage of the battery to be charged 3 (that is, the equilibrium voltage of the battery to be charged 3) immediately after the elapse of the required time is read and stored. This battery voltage Vk serves as a reference voltage when the battery 3 to be charged is recharged thereafter.
【００１４】ステップＳ４、Ｓ５において、被充電電池
３の電池電圧Ｖ１及びこの電池電圧Ｖ１の検出時より所
定時間（Δｔ）経過後の電池電圧Ｖ２が、各々検出さ
れ、第１及び第２電池電圧保持回路６及び７に記憶保持
される。続いて、ステップＳ６において、第１及び第２
電池電圧保持回路６及び７に保持された電池電圧Ｖ１及
びＶ２に基づいて、電池電圧変化率（即ち、−ΔＶ（＝
Ｖ１−Ｖ２）／Δｔ）が算出され、この変化率が所定値
（例えば、−２ｍＶ／秒）より大きいか否かが判断され
る。大きくない場合、ステップＳ４〜Ｓ６を循環し、随
時変化率が算出されて所定値と比較される。In steps S4 and S5, the battery voltage V1 of the battery 3 to be charged and the battery voltage V2 after a lapse of a predetermined time (Δt) from the detection of the battery voltage V1 are respectively detected, and the first and second battery voltages are detected. It is stored and held in the holding circuits 6 and 7. Then, in step S6, the first and second
Based on the battery voltages V1 and V2 held in the battery voltage holding circuits 6 and 7, the battery voltage change rate (that is, -ΔV (=
V1-V2) / [Delta] t) is calculated, and it is determined whether or not this rate of change is greater than a predetermined value (e.g., -2 mV / sec). If it is not larger, steps S4 to S6 are repeated, and the change rate is calculated at any time and compared with a predetermined value.
【００１５】前述の変化率が所定値より大きい場合、言
い換えれば、スイッチＳＷがオン状態とされ、被充電電
池３より負荷に電流が供給されて被充電電池３の電池電
圧が急速に低下した場合、ステップＳ７、Ｓ８におい
て、充電電流制御回路２が制御されて充電電流が急速充
電電流とされ、被充電電池３が再充電される。この再充
電は、被充電電池３の電池電圧がステップＳ３で記憶さ
れた基準電圧Ｖｋに達するまで行われる。そして、被充
電電池３の電池電圧が基準電圧Ｖｋに達すると、ステッ
プＳ９において、充電電流が急速充電電流からトリクル
充電電流に切り替えられる。When the above-mentioned rate of change is larger than a predetermined value, in other words, when the switch SW is turned on, the current is supplied from the battery 3 to be charged to the load, and the battery voltage of the battery 3 to be charged is rapidly lowered. In steps S7 and S8, the charging current control circuit 2 is controlled to change the charging current to the rapid charging current, and the battery 3 to be charged is recharged. This recharge is performed until the battery voltage of the battery 3 to be charged reaches the reference voltage Vk stored in step S3. When the battery voltage of the battery 3 to be charged reaches the reference voltage Vk, the charging current is switched from the quick charging current to the trickle charging current in step S9.
【００１６】以後、電池電圧の変化率が所定値以上にな
る度に、前述の動作が繰り返され、従って、被充電電池
３は充電器にセットされている限り、負荷が接続されて
も、満充電状態を維持するように充電される。Thereafter, the above-mentioned operation is repeated every time the rate of change of the battery voltage exceeds a predetermined value. Therefore, as long as the battery 3 to be charged is set in the charger, even if a load is connected, the battery is fully charged. It is charged to maintain the state of charge.
【００１７】[0017]
【発明の効果】本発明によれば、被充電電池の満充電を
検出して前記被充電電池の充電を制御する満充電検出手
段と、前記被充電電池の満充電検出後、前記被充電電池
の電池電圧の変化率を検出する電圧変化率検出手段と、
前記変化率が所定値以上であることが検出されると、前
記被充電電池を再充電する再充電手段とを備えているの
で、被充電電池の電池電圧が低下する毎に確実に被充電
電池を再充電することができ、被充電電池が充電器にセ
ットされている限り、常に満充電状態に維持することが
できる。According to the present invention, the full charge detecting means for detecting the full charge of the battery to be charged and controlling the charging of the battery to be charged, and the battery to be charged after the full charge of the battery to be charged is detected. Voltage change rate detection means for detecting the change rate of the battery voltage of
When the rate of change is detected to be equal to or greater than a predetermined value, the rechargeable unit includes a recharging unit that recharges the rechargeable battery. Can be recharged and can always be kept fully charged as long as the battery to be charged is set in the charger.
【図１】本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】本発明の動作を示すフローチャートである。FIG. 2 is a flowchart showing the operation of the present invention.
【図３】本発明における被充電電池の電圧特性を示す特
性図である。FIG. 3 is a characteristic diagram showing voltage characteristics of a battery to be charged according to the present invention.
２ 充電電流制御回路 ３ 被充電電池 ４ 負荷 ５ 電池電圧検出回路 ８ −ΔＶ／Δｔ演算回路 ９ 遅延タイマ回路 １０ 充電制御部 2 Charge current control circuit 3 Charged battery 4 Load 5 Battery voltage detection circuit 8-ΔV / Δt arithmetic circuit 9 Delay timer circuit 10 Charge control unit
Claims (4)
電電池の充電を制御する満充電検出手段と、前記被充電
電池の満充電検出後、前記被充電電池の電池電圧の変化
率を検出する電圧変化率検出手段と、前記変化率が所定
値以上であることが検出されると、前記被充電電池を再
充電する再充電手段とを備えたことを特徴とする充電
器。1. A full-charge detecting means for detecting full charge of a battery to be charged and controlling charging of the battery to be charged, and a rate of change in battery voltage of the battery to be charged after detection of full charge of the battery to be charged. And a recharging means for recharging the battery to be charged when it is detected that the change rate is equal to or more than a predetermined value.
検出手段による満充電検出から所定時間経過した以降に
電圧変化率を検出することを特徴とする請求項１の充電
器。2. The charger according to claim 1, wherein the voltage change rate detecting means detects the voltage change rate after a predetermined time has elapsed from the full charge detection by the full charge detecting means.
池電圧が前記所定時間経過時の電池電圧に達するまで前
記被充電電池を再充電することを特徴とする請求項２の
充電器。3. The charger according to claim 2, wherein the recharging means recharges the battery to be charged until the battery voltage of the battery to be charged reaches the battery voltage after the lapse of the predetermined time.
電電池の充電を制御した後、前記被充電電池の電池電圧
の変化率を検出し、当該変化率が所定値以上であること
が検出されると、前記被充電電池を再充電することを特
徴とする被充電電池の充電方法。4. The rate of change of the battery voltage of the battery to be charged is detected after detecting the full charge of the battery to be charged to control the charging of the battery to be charged, and the rate of change is not less than a predetermined value. Is detected, the rechargeable battery is recharged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03228994A JP3182283B2 (en) | 1994-03-02 | 1994-03-02 | Charger and method of charging battery to be charged |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03228994A JP3182283B2 (en) | 1994-03-02 | 1994-03-02 | Charger and method of charging battery to be charged |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07245884A true JPH07245884A (en) | 1995-09-19 |
| JP3182283B2 JP3182283B2 (en) | 2001-07-03 |
Family
ID=12354809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03228994A Expired - Fee Related JP3182283B2 (en) | 1994-03-02 | 1994-03-02 | Charger and method of charging battery to be charged |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3182283B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6194874B1 (en) | 1999-03-17 | 2001-02-27 | Telefonaktiebolaget Lm Ericsson (Publ) | System and method for maintenance charging of battery cells |
| JP2002075463A (en) * | 2000-09-04 | 2002-03-15 | Fujitsu Kiden Ltd | Charge control device of secondary cell, and charging method of the same |
| CN113872268A (en) * | 2021-09-01 | 2021-12-31 | 蜂巢能源科技有限公司 | Method and device for charging battery of electric vehicle in quick charging final stage and storage medium |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016012098A (en) * | 2014-06-30 | 2016-01-21 | シナノケンシ株式会社 | Electronic book reproduction device and electronic book reproduction program |
-
1994
- 1994-03-02 JP JP03228994A patent/JP3182283B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6194874B1 (en) | 1999-03-17 | 2001-02-27 | Telefonaktiebolaget Lm Ericsson (Publ) | System and method for maintenance charging of battery cells |
| JP2002075463A (en) * | 2000-09-04 | 2002-03-15 | Fujitsu Kiden Ltd | Charge control device of secondary cell, and charging method of the same |
| CN113872268A (en) * | 2021-09-01 | 2021-12-31 | 蜂巢能源科技有限公司 | Method and device for charging battery of electric vehicle in quick charging final stage and storage medium |
| CN113872268B (en) * | 2021-09-01 | 2023-06-30 | 蜂巢能源科技有限公司 | Method and device for charging battery of electric automobile at quick charge end stage and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3182283B2 (en) | 2001-07-03 |
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| LAPS | Cancellation because of no payment of annual fees |