JP2906862B2 - Battery charging method - Google Patents
Battery charging methodInfo
- Publication number
- JP2906862B2 JP2906862B2 JP4256187A JP25618792A JP2906862B2 JP 2906862 B2 JP2906862 B2 JP 2906862B2 JP 4256187 A JP4256187 A JP 4256187A JP 25618792 A JP25618792 A JP 25618792A JP 2906862 B2 JP2906862 B2 JP 2906862B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature rise
- rise rate
- charging
- battery temperature
- battery
- 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 - Lifetime
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
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は例えばニッケル・カドミ
ウム電池等の２次電池の満充電検出を電池温度上昇率よ
り検出して、２次電池への充電を制御する電池充電法に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery charging method for controlling the charging of a secondary battery such as a nickel-cadmium battery by detecting the full charge of the battery from the rate of temperature rise of the battery. .
【０００２】[0002]
【従来の技術】２次電池を急速充電する時の満充電検出
法として種々なものがあるが、特に急速充電器に用いら
れるものとして、充電時における所定時間当たりの電池
温度上昇率（以下単に温度上昇率という）が所定値以上
になるのを検出して充電を制御するΔＴ／Δｔ法があ
り、このΔＴ／Δｔ法に関して、特開昭６２−１９３５
１８号、特開平２−２４６７３９号、実開平３−３４６
３８号公報等に記載されている。2. Description of the Related Art There are various methods for detecting a full charge when a secondary battery is rapidly charged. Particularly, as a method for use in a quick charger, a battery temperature rise rate per predetermined time during charging (hereinafter simply referred to as "charge rate"). There is a .DELTA.T / .DELTA.t method for controlling charging by detecting that the temperature rise rate exceeds a predetermined value. The .DELTA.T / .DELTA.t method is disclosed in Japanese Patent Application Laid-Open No. 62-1935.
No. 18, JP-A-2-24639, JP-A-3-346
No. 38, and the like.
【０００３】[0003]
【発明が解決しょうとする課題】しかしながら、図３、
図４の充電特性に示すように、充電時における前記温度
上昇率は周囲温度、充電電流の影響を受ける。すなわ
ち、周囲温度が低い程及び充電電流が大きい程温度上昇
率が大きいので、これに応じて満充電を検出する温度上
昇率の比較値を大きめに設定すると、周囲温度が高い程
及び充電電流が小さい程温度上昇率が小さいので、周囲
温度が高い時及び充電電流が小さい時に満充電検出が遅
れ、過充電となる恐れがあると共に最悪の場合満充電を
検出できない恐れがある。反対に、満充電を検出する温
度上昇率の比較値を、周囲温度が高い方及び充電電流が
小さい方に応じて小さめに設定すると、周囲温度が低い
時及び充電電流が大きい時に充電途中で満充電と誤検出
し不足充電となる恐れがある。本発明の目的は、上記し
た従来技術の欠点をなくし、周囲温度、充電電流の影響
を受けることなく満充電を確実に検出できるようにする
ことである。[Problems to be solved by the invention] However, FIG.
As shown in the charging characteristics of FIG. 4, the rate of temperature rise during charging is affected by ambient temperature and charging current. That is, the lower the ambient temperature and the larger the charging current, the larger the temperature rise rate. Therefore, if the comparative value of the temperature rise rate for detecting the full charge is set to be relatively large, the higher the ambient temperature and the larger the charging current, Since the smaller the temperature, the smaller the rate of temperature rise, the detection of full charge is delayed when the ambient temperature is high and the charging current is small, which may result in overcharging and, in the worst case, fail to detect full charging. Conversely, if the comparison value of the temperature rise rate at which full charge is detected is set smaller depending on whether the ambient temperature is high or the charge current is small, the charge value will be full during charging when the ambient temperature is low and the charge current is large. There is a possibility that the battery may be erroneously detected as being charged and may be undercharged. SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned disadvantages of the prior art and to reliably detect a full charge without being affected by an ambient temperature and a charging current.
【０００４】[0004]
【課題を解決するための手段】上記目的は、充電初期の
温度上昇率を演算記憶し、以後所定時間経過毎に温度上
昇率を演算記憶すると共に該記憶した温度上昇率を充電
初期の温度上昇率と比較して充電初期の温度上昇率より
小さければ、今回の温度上昇率を充電初期の温度上昇率
に置き換えることによって最小温度上昇率を求め、以後
演算記憶した温度上昇率が最小温度上昇率より所定値以
上に大きくなったのを検出したら充電を停止するように
したことを特徴とするものである。なお充電を停止する
とは、完全に充電動作を終了することはもちろんのこ
と、急速充電を停止して満充電状態を維持するトリクル
充電に移ることも意味するものとする。SUMMARY OF THE INVENTION It is an object of the present invention to calculate and store the temperature rise rate at the beginning of charging, calculate and store the temperature rise rate every time a predetermined time elapses, and use the stored temperature rise rate as the temperature rise at the beginning of charging. If the temperature rise rate is smaller than the temperature rise rate at the beginning of charging, the minimum temperature rise rate is calculated by replacing the current temperature rise rate with the temperature rise rate at the beginning of charge. Charging is stopped when it is detected that the value has become larger than a predetermined value. Stopping charging means not only terminating the charging operation completely, but also shifting to trickle charging in which rapid charging is stopped to maintain a fully charged state.
【０００５】[0005]
【作用】上記した本発明充電法によれば、周囲温度及び
充電電流の影響を受けることなく満充電を確実に検出で
きるようになる。According to the charging method of the present invention described above, full charge can be reliably detected without being affected by the ambient temperature and the charging current.
【０００６】[0006]
【実施例】図１は本発明の一実施例を示すブロック図で
ある。１は充電電源、２は複数の再充電可能な２次電池
を接続した電池組、３は例えば電池組２の外装面に設け
られて電池温度を検出する電池温度検出手段、４は電池
組２に流れる充電電流を検出する電流検出手段、５は電
流検出手段４からの帰還信号にもとづき電池組２を充電
する充電電流を一定にするように充電電源１を制御する
定電流制御手段、６は電池温度検出手段３のアナログ出
力電圧を検出しデジタル信号に変換するＡ／Ｄコンバー
タ、７は該Ａ／Ｄコンバータ６の出力を充電開始から所
定時間経過する毎に受け、温度上昇率を演算して記憶す
ると共に最新の温度上昇率と充電初期の温度上昇率との
差を計算し、該差が所定値Ｋ以上となった時に前記充電
電源１を介して充電を停止させるマイコンであって、本
発明演算手段を構成するものである。FIG. 1 is a block diagram showing an embodiment of the present invention. Reference numeral 1 denotes a charging power source, 2 denotes a battery set to which a plurality of rechargeable rechargeable batteries are connected, 3 denotes a battery temperature detecting means provided on an outer surface of the battery set 2 for detecting a battery temperature, and 4 denotes a battery set 2 Current detecting means 5 for detecting a charging current flowing through the power supply 5; constant current controlling means 5 for controlling the charging power supply 1 based on a feedback signal from the current detecting means 4 so as to make the charging current for charging the battery set 2 constant; An A / D converter 7 for detecting an analog output voltage of the battery temperature detecting means 3 and converting it into a digital signal, receives the output of the A / D converter 6 every time a predetermined time elapses from the start of charging, and calculates a temperature rise rate. A microcomputer that calculates the difference between the latest temperature rise rate and the initial temperature rise rate and stops charging via the charging power supply 1 when the difference becomes equal to or greater than a predetermined value K; Constituting the arithmetic means of the present invention Than it is.
【０００７】図１のブロック図及び図２のフローチャー
トを参照して本発明の動作を説明する。充電を開始する
と（ステップ１０１）、マイコン７は充電初期の温度上
昇率ΔＴ0／Δｔを演算記憶する（ステップ１０２）。
所定時間経過する毎に温度上昇率ΔＴi／Δｔを演算記
憶し（ステップ１０３）、該記憶した温度上昇率ΔＴi
／Δｔと充電初期の温度上昇率ΔＴ0／Δｔとの差を取
り、この差が所定値Ｋ以上か否かを比較する（ステップ
１０４）。差が所定値Ｋより小さい時は再度ステップ１
０３の処理に戻り、Ｋ以上の時は充電を停止し（ステッ
プ１０５）、充電の１サイクルを終了する。The operation of the present invention will be described with reference to the block diagram of FIG. 1 and the flowchart of FIG. When charging is started (step 101), the microcomputer 7 calculates and stores the temperature rise rate ΔT 0 / Δt at the beginning of charging (step 102).
Every time the predetermined time elapses, the temperature rise rate ΔT i / Δt is calculated and stored (step 103), and the stored temperature rise rate ΔT i is calculated.
/ Delta] t and takes the difference between the initial charging temperature rise rate ΔT 0 / Δt, this difference is compared whether more than a predetermined value K (step 104). If the difference is smaller than the predetermined value K, repeat step 1
Returning to the process of 03, when it is K or more, charging is stopped (step 105), and one cycle of charging is ended.
【０００８】上記実施例は、所定の周囲温度または充電
電流の下で充電する場合の温度上昇率が満充電近傍まで
はほぼ同じであるという充電特性を利用したものである
が、図６に示すように電池によっては充電開始時の温度
上昇率が大きく、充電開始から所定時間経過するまでは
下降し、その後満充電近傍まで上昇する例えばニッケル
水素電池のような電池がある。かかる電池の場合には、
図５のフローチャートに示す如く所定時間経過毎に演算
した温度上昇率を充電初期の温度上昇率と比較し（ステ
ップ１０６）、充電初期温度上昇率より小さければ、こ
の温度上昇率を前記初期温度上昇率と置換する（ステッ
プ１０７）ことにより最小温度上昇率を求め、以後演算
記憶した温度上昇率が最小温度上昇率より所定値Ｋ以上
大きくなった（ステップ１０４）時に充電を停止させる
（ステップ１０５）ようにすることにより対応できるよ
うになる。The above embodiment utilizes the charging characteristic that the rate of temperature rise when charging at a predetermined ambient temperature or charging current is substantially the same until near full charge, as shown in FIG. As described above, depending on the battery, there is a battery such as a nickel-metal hydride battery, which has a large temperature rise rate at the start of charging, decreases until a predetermined time has elapsed from the start of charging, and then rises to near full charge. In the case of such a battery,
As shown in the flowchart of FIG. 5, the temperature rise rate calculated every predetermined time is compared with the temperature rise rate at the beginning of charging (step 106). If the temperature rise rate is smaller than the initial temperature rise rate, the temperature rise rate is reduced to the initial temperature rise. The minimum temperature rise rate is obtained by substituting the rate with the rate (step 107). Thereafter, when the calculated and stored temperature rise rate exceeds the minimum temperature rise rate by a predetermined value K or more (step 104), charging is stopped (step 105). By doing so, it becomes possible to respond.
【０００９】[0009]
【発明の効果】以上のように本発明によれば、周囲温
度、充電電流の影響を受けることなく満充電を確実に検
出できるようになるので、広範囲の周囲温度、充電電流
の領域で電池を確実に満充電にすることができる。As described above, according to the present invention, full charge can be reliably detected without being affected by the ambient temperature and the charging current. Therefore, the battery can be used in a wide range of the ambient temperature and the charging current. It can be fully charged.
【図１】本発明の一実施例を示すブロック図。FIG. 1 is a block diagram showing one embodiment of the present invention.
【図２】本発明の一実施例を示すフローチャート。FIG. 2 is a flowchart showing one embodiment of the present invention.
【図３】周囲温度に対する充電特性を示すグラフ。FIG. 3 is a graph showing charging characteristics with respect to ambient temperature.
【図４】充電電流に対する充電特性を示すグラフ。FIG. 4 is a graph showing charging characteristics with respect to charging current.
【図５】本発明の他の実施例を示すフローチャート。FIG. 5 is a flowchart showing another embodiment of the present invention.
【図６】他の電池の充電特性を示すグラフ。FIG. 6 is a graph showing charging characteristics of another battery.
１は充電電源、２は電池組、３は温度検出手段、４は充
電電流検出手段、５は定電流制御手段、６はＡ／Ｄコン
バータ、７はマイコンである。1 is a charging power supply, 2 is a battery set, 3 is a temperature detecting means, 4 is a charging current detecting means, 5 is a constant current controlling means, 6 is an A / D converter, and 7 is a microcomputer.
Claims (3)
出手段と、充電開始時及びそれ以降所定時間経過する毎
に電池温度検出手段の検出出力を受け、電池温度上昇率
を逐次演算記憶する演算手段とを有する電池充電装置に
おいて、 前記演算手段により演算記憶した温度上昇率が、最小の
電池温度上昇率より所定値以上大きくなった時に充電を
停止するようにしたことを特徴とする電池充電法。1. A battery temperature detecting means for detecting a temperature of a battery to be charged, and a detection output of the battery temperature detecting means at the start of charging and every time a predetermined time elapses thereafter, and sequentially calculates and stores a rate of increase in battery temperature. A battery charging device having a calculating means, wherein the charging is stopped when the temperature rise rate calculated and stored by the calculating means becomes larger than a minimum battery temperature rise rate by a predetermined value or more. Law.
の電池温度上昇率としたことを特徴とする請求項１記載
の電池充電法。2. The battery charging method according to claim 1, wherein the minimum battery temperature rise rate is a battery temperature rise rate at the beginning of charging.
上昇率を演算記憶する毎に充電初期電池温度上昇率と比
較し、充電初期電池温度上昇率より小さければ演算記憶
した電池温度上昇率を充電初期電池温度上昇率に置換す
ることにより求めた充電初期電池温度上昇率としたこと
を特徴とする請求項１記載の電池充電法。3. The minimum battery temperature rise rate is compared with the initial battery temperature rise rate each time the battery temperature rise rate is calculated and stored. If the minimum battery temperature rise rate is smaller than the initial battery temperature rise rate, the calculated battery temperature rise rate is stored. 2. The battery charging method according to claim 1, wherein the initial battery temperature rise rate obtained by substituting the initial battery temperature rise rate with the initial battery temperature rise rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4256187A JP2906862B2 (en) | 1992-09-25 | 1992-09-25 | Battery charging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4256187A JP2906862B2 (en) | 1992-09-25 | 1992-09-25 | Battery charging method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06113475A JPH06113475A (en) | 1994-04-22 |
| JP2906862B2 true JP2906862B2 (en) | 1999-06-21 |
Family
ID=17289118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4256187A Expired - Lifetime JP2906862B2 (en) | 1992-09-25 | 1992-09-25 | Battery charging method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2906862B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100379118C (en) * | 2003-07-18 | 2008-04-02 | 日立工机株式会社 | Battery Charger with Accurate Battery Temperature Sensing for Determining Full Charge |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3161272B2 (en) * | 1994-06-03 | 2001-04-25 | 日立工機株式会社 | Battery charger |
| US6172487B1 (en) | 1998-06-17 | 2001-01-09 | Black & Decker Inc. | Method and apparatus for charging batteries |
| JP2006166641A (en) * | 2004-12-08 | 2006-06-22 | Hitachi Koki Co Ltd | Charger |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2739133B2 (en) | 1992-03-16 | 1998-04-08 | ４シーテクノロジーズ インコーポレイティド | Nickel-cadmium battery high-speed charging apparatus and high-speed charging method |
-
1992
- 1992-09-25 JP JP4256187A patent/JP2906862B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2739133B2 (en) | 1992-03-16 | 1998-04-08 | ４シーテクノロジーズ インコーポレイティド | Nickel-cadmium battery high-speed charging apparatus and high-speed charging method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100379118C (en) * | 2003-07-18 | 2008-04-02 | 日立工机株式会社 | Battery Charger with Accurate Battery Temperature Sensing for Determining Full Charge |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06113475A (en) | 1994-04-22 |
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