JP2002359009A - Charger - Google Patents
ChargerInfo
- Publication number
- JP2002359009A JP2002359009A JP2001165775A JP2001165775A JP2002359009A JP 2002359009 A JP2002359009 A JP 2002359009A JP 2001165775 A JP2001165775 A JP 2001165775A JP 2001165775 A JP2001165775 A JP 2001165775A JP 2002359009 A JP2002359009 A JP 2002359009A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- circuit
- capacity
- charge
- storage
- 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.)
- Pending
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]
【発明の属する技術分野】本発明はリチウムイオン二次
電池を充電する充電器に関する。The present invention relates to a charger for charging a lithium ion secondary battery.
【０００２】[0002]
【従来の技術】二次電池は、種々の状態で充放電しなが
ら使用される。あるときは頻繁に充放電を繰り返す状態
で使用され、またあるときは長期間使用されないで放置
される。長期間使用しないで放置された電池は、自己放
電して残容量が次第に少なくなる。放置される期間が長
いと、残容量がなくなり、さらに自己放電して過放電さ
れる。電池は、過放電されると電気的な性能が急激に低
下する性質がある。とくにリチウムイオン二次電池は、
ニッケル−水素電池やニッケル−カドミウム電池に比較
すると、長期間放置されたときに過放電されて性能が急
激に低下する性質がある。2. Description of the Related Art Secondary batteries are used while being charged and discharged in various states. Sometimes it is used in a state where charging and discharging are frequently repeated, and sometimes it is left unused for a long time. A battery left unused for a long time self-discharges and the remaining capacity gradually decreases. If the period for which the device is left for a long time is long, the remaining capacity is lost, and the battery is further self-discharged and overdischarged. Batteries have the property that their electrical performance drops sharply when overdischarged. In particular, lithium ion secondary batteries are
Compared to a nickel-hydrogen battery or a nickel-cadmium battery, they have a property of being overdischarged when left for a long period of time and having a sharply reduced performance.
【０００３】[0003]
【発明が解決しようとする課題】電池が自己放電で過放
電されて性能が低下する弊害は、電池を満充電された状
態で保存して防止できる。満充電された電池は、自己放
電で残容量がなくなるまでに相当に時間がかかるからで
ある。しかしながら、不思議なことにリチウムイオン二
次電池は、満充電した状態で長期間使用しないで放置し
ても、性能が低下する性質がある。とくに、実質的に充
放電できる充電容量が減少する性質がある。The disadvantage that the battery is over-discharged by self-discharge and the performance is reduced can be prevented by storing the battery in a fully charged state. This is because a fully charged battery takes a considerable amount of time to lose its remaining capacity due to self-discharge. However, surprisingly, the lithium ion secondary battery has a property of deteriorating its performance even if it is left unused for a long time in a fully charged state. In particular, there is a property that the charge capacity that can be charged and discharged substantially decreases.
【０００４】図１は、満充電されたリチウムイオン二次
電池（曲線Ａ）と、残容量が０となった完全放電された
リチウムイオン二次電池（曲線Ｂ）を長期間放置し、そ
の後満充電して放電できる復帰容量が減少する特性を示
している。図のグラフは、横軸に示す放置時間を０〜１
年間としており、この放置期間内におけるリチウムイオ
ン二次電池の復帰容量を１００％を基準として示してい
る。復帰容量が小さくなった電池は、その後に満充電し
ても、放電できる容量が小さくなり、電池の実質的な充
電容量が少なくなる。曲線Ｂで示すように、完全放電さ
れた電池は、最初に復帰容量の減少は少ないが、その後
急激に減少する。これに対して満充電された電池は、曲
線Ａで示すように、最初から次第に復帰容量が小さくな
る。ところが、曲線Ｃで示す電池は、最初から復帰容量
の低下が少なく、理想的な状態で長期保存できることが
わかる。この電池は、残容量を３０％とするリチウムイ
オン二次電池である。このグラフは、長期間使用しない
で放置されるリチウムイオン二次電池の残容量が０％で
あっても、また１００％であっても好ましくないことを
示している。ただ、ユーザーが電池を使用するとき、機
器で電池を完全に放電し、あるいは充電器で満充電する
ことはできるが、残容量を所定の容量とすることはでき
ない。このため、リチウムイオン二次電池を長期保存に
最適な容量に充放電することができない。したがって、
現実にはリチウムイオン二次電池が好ましくない残容量
で保存され、復帰容量を急激に少なくしているのが現実
である。FIG. 1 shows a fully charged lithium ion secondary battery (curve A) and a completely discharged lithium ion secondary battery having a remaining capacity of 0 (curve B) for a long period of time. It shows the characteristic that the return capacity that can be charged and discharged decreases. In the graph of FIG.
The recovery capacity of the lithium-ion secondary battery during this period is shown on the basis of 100%. A battery having a reduced return capacity has a smaller capacity that can be discharged even if it is fully charged thereafter, and the substantial charge capacity of the battery is reduced. As shown by the curve B, the fully discharged battery has a small decrease in the recovery capacity at first, but then sharply decreases thereafter. On the other hand, a fully charged battery has a gradually reduced return capacity from the beginning as shown by the curve A. However, it can be understood that the battery shown by the curve C has a small decrease in the recovery capacity from the beginning and can be stored for a long time in an ideal state. This battery is a lithium ion secondary battery having a remaining capacity of 30%. This graph shows that it is not preferable that the remaining capacity of the lithium ion secondary battery left unused without being used for a long time is 0% or 100%. However, when the user uses the battery, the battery can be completely discharged by the device or fully charged by the charger, but the remaining capacity cannot be set to a predetermined capacity. For this reason, the lithium ion secondary battery cannot be charged / discharged to a capacity optimal for long-term storage. Therefore,
In reality, a lithium ion secondary battery is stored with an undesired remaining capacity, and the return capacity is rapidly reduced.
【０００５】本発明は、このような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、リチウムイオン二次電池を理想的な状態で長期保存
でき、保存中における電池の性能低下を極減できるリチ
ウムイオン二次電池の充電器を提供することにある。[0005] The present invention has been developed for the purpose of solving such a drawback. An important object of the present invention is to provide a lithium ion secondary battery charger that can store a lithium ion secondary battery in an ideal state for a long period of time and can minimize a decrease in battery performance during storage.
【０００６】[0006]
【課題を解決するための手段】本発明の充電器は、電池
の残容量が、完全放電容量よりも大きくて満充電容量よ
りも小さい保存容量となるように電池を充放電する保存
充放電回路７と、電池を満充電する満充電回路８とを備
える。この充電器は、保存モードにおいて、保存充放電
回路７が電池を保存に適した保存容量となるように充放
電し、満充電モードにおいて、満充電回路８が電池を満
充電する。According to the present invention, there is provided a charger / discharge circuit for charging / discharging a battery so that the remaining capacity of the battery is a storage capacity larger than a complete discharge capacity and smaller than a full charge capacity. 7 and a full charge circuit 8 for fully charging the battery. In this charger, in the storage mode, the storage charge / discharge circuit 7 charges and discharges the battery to have a storage capacity suitable for storage, and in the full charge mode, the full charge circuit 8 fully charges the battery.
【０００７】充電器は、残容量検出回路１１を設けて、
電池の残容量を電池電圧から検出することができる。さ
らに、充電器は、パック電池１２を装着すると共に、こ
のパック電池１２に内蔵される残容量の演算回路１２と
通信する通信回路６を設けて、この通信回路６を介して
電池の残容量を検出して電池を充電することができる。[0007] The charger is provided with a remaining capacity detection circuit 11,
The remaining capacity of the battery can be detected from the battery voltage. Further, the battery charger is provided with a communication circuit 6 for mounting the battery pack 12 and communicating with the remaining capacity calculation circuit 12 built in the battery pack 12, and the remaining battery capacity is calculated via the communication circuit 6. It can detect and charge the battery.
【０００８】さらに、充電器は、保存容量を、満充電容
量の２０〜７０％の範囲に設定することができる。保存
容量は、一定容量とすることができる。さらに、充電器
は、電池の残容量が２０〜７０％の範囲にあるとき、電
池の残容量を保存容量として保存充放電回路７が電池を
充放電しないようにすることができる。[0008] Further, the battery charger can set the storage capacity in the range of 20 to 70% of the full charge capacity. The storage capacity can be a fixed capacity. Further, when the remaining capacity of the battery is in the range of 20 to 70%, the charger can use the remaining capacity of the battery as the storage capacity so that the storage charge / discharge circuit 7 does not charge / discharge the battery.
【０００９】さらに、充電器は、保存充放電回路７と満
充電回路８を切り換える切換スイッチ１０を設けて、切
換スイッチ１０で保存充放電回路７と満充電回路８とを
切り換えて電池を充放電することができる。Further, the charger is provided with a changeover switch 10 for switching between the storage charge / discharge circuit 7 and the full charge circuit 8, and the changeover switch 10 switches between the storage charge / discharge circuit 7 and the full charge circuit 8 to charge / discharge the battery. can do.
【００１０】さらにまた、充電器は、保存充放電回路７
と満充電回路８を切り換える切換回路９を設けて、この
切換回路９に電池が使用されない不使用時間をカウント
するタイマーを内蔵することができる。この充電器は、
不使用時間が設定時間よりも長くなると、電池を保存充
放電回路７で充放電する。この充電器は、好ましくは、
電池を内蔵する機器に内蔵する。Further, the charger includes a storage / charge / discharge circuit 7.
A switching circuit 9 for switching between the full charge circuit 8 and the full charge circuit 8 can be provided, and the switching circuit 9 can incorporate a timer for counting a non-use time when the battery is not used. This charger is
When the non-use time becomes longer than the set time, the battery is charged / discharged by the storage / discharge circuit 7. This charger is preferably
Built-in device with built-in battery.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施例を図面に基
づいて説明する。ただし、以下に示す実施例は、本発明
の技術思想を具体化するための充電器を例示するもので
あって、本発明は充電器を以下のものに特定しない。Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below exemplify a charger for embodying the technical idea of the present invention, and the present invention does not limit the charger to the following.
【００１２】さらに、この明細書は、特許請求の範囲を
理解しやすいように、実施例に示される部材に対応する
番号を、「特許請求の範囲の欄」、および「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、実施例の部材
に特定するものでは決してない。Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments will be referred to as “claims” and “ In the column of “means”.
However, the members described in the claims are not limited to the members of the embodiments.
【００１３】図２はリチウムイオン二次電池の充電器を
示す。この充電器１は、リチウムイオン二次電池である
二次電池１３を充電する充電電源２と、この充電電源２
と電池との間に接続しているスイッチング素子３と、ス
イッチング素子３をオンオフに制御する制御回路４と、
この制御回路４に制御されて残容量の大きい電池を放電
させる放電回路５と、電池と通信する通信回路６とを備
える。この図の充電器１は、二次電池１３の残容量を演
算する演算回路１４を内蔵しているパック電池１２を充
電する。したがって、パック電池１２と通信する通信回
路６を内蔵している。ただ、充電器は、演算回路を内蔵
しないパック電池も充電できるので、演算回路を内蔵し
ないパック電池を充電する充電器は、通信回路を設ける
必要がない。FIG. 2 shows a charger for a lithium ion secondary battery. The charger 1 includes a charging power supply 2 for charging a secondary battery 13 which is a lithium ion secondary battery, and a charging power supply 2
A switching element 3 connected between the power supply and the battery, a control circuit 4 for controlling the switching element 3 to turn on and off,
A discharge circuit 5 controlled by the control circuit 4 to discharge a battery having a large remaining capacity and a communication circuit 6 communicating with the battery are provided. The charger 1 in this figure charges a battery pack 12 having a built-in arithmetic circuit 14 for calculating the remaining capacity of a secondary battery 13. Therefore, the communication circuit 6 for communicating with the battery pack 12 is incorporated. However, since the charger can also charge a battery pack without a built-in arithmetic circuit, a charger for charging a battery pack without a built-in arithmetic circuit does not need to provide a communication circuit.
【００１４】充電電源２は、入力される電圧を、電池の
充電電圧である直流に変換して出力する。充電電源２
は、好ましくは定電圧定電流回路を内蔵する。この充電
電源２は、電池を定電圧定電流充電して満充電できる。
ただ、充電電源は、必ずしも定電圧定電流回路を内蔵す
る必要はない。The charging power supply 2 converts an input voltage into a direct current, which is a charging voltage of a battery, and outputs the converted voltage. Charging power supply 2
Preferably has a built-in constant voltage / current circuit. The charging power source 2 can perform full charge by charging the battery at a constant voltage and a constant current.
However, the charging power supply does not necessarily need to have a built-in constant voltage and constant current circuit.
【００１５】スイッチング素子３は、トランジスターや
ＦＥＴ等の半導体スイッチング素子である。スイッチン
グ素子３は、制御回路４に制御されてオンオフに切り換
えられる。スイッチング素子３がオンになると、充電電
源２は電池を充電し、オフになると充電を停止する。The switching element 3 is a semiconductor switching element such as a transistor or an FET. The switching element 3 is turned on and off under the control of the control circuit 4. When the switching element 3 is turned on, the charging power source 2 charges the battery, and when the switching element 3 is turned off, the charging is stopped.
【００１６】放電回路５は、放電抵抗と放電スイッチを
直列に接続している。放電スイッチがオンになると電池
を放電する。放電スイッチがオフになると電池の放電を
停止する。放電抵抗は、電池の放電電流を特定する。放
電抵抗は、電池を劣化させることなく速やかに放電でき
る抵抗値、たとえば電池を１Ｃの電流で放電できる抵抗
値とする。放電回路５は、制御回路４に内蔵される保存
充放電回路７でオンオフに制御される。The discharge circuit 5 has a discharge resistor and a discharge switch connected in series. When the discharge switch is turned on, the battery is discharged. When the discharge switch is turned off, discharging of the battery is stopped. The discharge resistance specifies the discharge current of the battery. The discharge resistance is a resistance value at which the battery can be quickly discharged without deteriorating the battery, for example, a resistance value at which the battery can be discharged with a current of 1C. The discharge circuit 5 is turned on and off by a storage charge / discharge circuit 7 built in the control circuit 4.
【００１７】制御回路４は、電池の残容量が、完全放電
容量よりも大きくて、満充電容量よりも小さい保存容量
となるように電池を充放電する保存充放電回路７と、電
池を満充電する満充電回路８とを備える。さらに図の制
御回路４は、保存充放電回路７と満充電回路８のいずれ
の回路で電池を充電するかを選択するための切換回路９
を備える。切換回路９は、切換スイッチ１０を接続して
いる。The control circuit 4 includes a storage charge / discharge circuit 7 for charging / discharging the battery so that the remaining capacity of the battery is larger than the complete discharge capacity and smaller than the full charge capacity. And a full charge circuit 8 that performs the charging. Further, the control circuit 4 shown in the figure includes a switching circuit 9 for selecting which of the storage charge / discharge circuit 7 and the full charge circuit 8 to charge the battery.
Is provided. The changeover circuit 9 is connected to a changeover switch 10.
【００１８】切換スイッチ１０は、充電器のユーザーに
操作されるスイッチで、スライドスイッチや押しボタン
スイッチである。充電器のユーザーは、切換スイッチ１
０を操作して、電池を保存状態に適した保存モードで充
放電するのと、電池を満充電する満充電モードとを切り
換える。この充電器１は、ユーザーが保存モードと満充
電モードを選択して、電池を最適な状態に充電する。The changeover switch 10 is a switch operated by a user of the charger, and is a slide switch or a push button switch. The user of the charger has a changeover switch 1
0 is operated to switch between charging and discharging the battery in a storage mode suitable for the storage state and a full charge mode in which the battery is fully charged. This charger 1 allows a user to select a storage mode or a full charge mode and charge the battery in an optimal state.
【００１９】ただ、切換回路９は、必ずしも切換スイッ
チを接続する必要はない。それは、切換回路９が、電池
の使用状態から保存モードと満充電モードを選択して電
池を充放電させることもできるからである。この切換回
路９は、電池が使用されない不使用時間をカウントする
タイマーを内蔵する。タイマーがカウントする不使用時
間が設定時間よりも長くなると、切換回路９は保存充放
電回路７を選択して、電池を保存モードで充放電する。
また、タイマーがカウントする不使用時間が設定時間よ
りも短いときは、切換回路９が満充電回路８を選択し
て、満充電モードで電池を満充電する。このように、切
換回路９が不使用時間で保存モードと満充電モードに切
り換える充電器は、ラップトップマイコン等の電気機器
に内蔵されるものに最適である。However, the switching circuit 9 does not necessarily need to connect a changeover switch. This is because the switching circuit 9 can also charge and discharge the battery by selecting the storage mode and the full charge mode from the usage state of the battery. The switching circuit 9 has a built-in timer for counting the non-use time when the battery is not used. When the unused time counted by the timer becomes longer than the set time, the switching circuit 9 selects the storage charge / discharge circuit 7 to charge / discharge the battery in the storage mode.
When the non-use time counted by the timer is shorter than the set time, the switching circuit 9 selects the full charge circuit 8 and fully charges the battery in the full charge mode. As described above, the charger in which the switching circuit 9 switches between the storage mode and the full charge mode during the non-use time is most suitable for the one built in an electric device such as a laptop microcomputer.
【００２０】保存充放電回路７は、電池の残容量が保存
容量となるように電池を充放電する。保存容量は、たと
えば満充電容量の２０〜７０％、好ましくは２０〜６０
％、さらに好ましくは２０〜５０％に設定される。この
容量で電池を長期間使用しないで放置するとき、復帰容
量の減少は最も少なくなる。保存容量は一定容量に特定
され、あるいは所定の範囲に設定することができる。保
存容量を一定容量に特定する充電器は、残容量が保存容
量よりも小さい電池を保存容量になるまで充電し、残容
量が保存容量よりも大きい電池を保存容量まで放電す
る。この充電器は、電池を最も理想的な容量に充放電し
て保存できる特長がある。保存容量を所定の範囲とする
充電器は、残容量が保存容量の範囲内にあるときは充放
電しない。残容量が保存容量の最低値よりも小さい電池
は最低の保存容量まで充電し、残容量が最高の保存容量
よりも大きい電池は最高の保存容量まで放電させる。保
存容量を所定の範囲に設定する充電器は、電池の充放電
量を少なくできる。保存容量を特定する電池の満充電容
量は、実際に充電できる容量、あるいは規格容量とする
ことができる。実際に充電できる容量は、電池が劣化し
て現実に満充電できる容量が少なくなると小さく補正す
る。The storage charge / discharge circuit 7 charges and discharges the battery so that the remaining capacity of the battery becomes the storage capacity. The storage capacity is, for example, 20 to 70% of the full charge capacity, preferably 20 to 60%.
%, More preferably 20 to 50%. When the battery is left at this capacity without being used for a long period of time, the decrease in the return capacity is minimized. The storage capacity is specified as a fixed capacity, or can be set to a predetermined range. The charger that specifies the storage capacity to be a fixed capacity charges a battery having a remaining capacity smaller than the storage capacity until the storage capacity is reached, and discharges a battery having a remaining capacity larger than the storage capacity to the storage capacity. This charger has the feature that the battery can be charged and discharged to the most ideal capacity and stored. A charger having a storage capacity within a predetermined range does not charge or discharge when the remaining capacity is within the storage capacity range. Batteries having a remaining capacity smaller than the lowest storage capacity are charged to the lowest storage capacity, and batteries having a remaining capacity larger than the highest storage capacity are discharged to the highest storage capacity. A charger that sets the storage capacity within a predetermined range can reduce the charge / discharge amount of the battery. The full charge capacity of the battery that specifies the storage capacity can be a capacity that can be actually charged or a standard capacity. The capacity that can be actually charged is corrected to be smaller when the battery deteriorates and the capacity that can actually be fully charged is reduced.
【００２１】保存充放電回路７は、電池を充電すると
き、スイッチング素子３をオンにして放電回路５の放電
スイッチをオフにする。電池を放電させるとき、スイッ
チング素子３をオフにして放電回路５の放電スイッチを
オンにする。When charging the battery, the storage / discharge circuit 7 turns on the switching element 3 and turns off the discharge switch of the discharge circuit 5. When discharging the battery, the switching element 3 is turned off and the discharge switch of the discharge circuit 5 is turned on.
【００２２】満充電回路８は、満充電モードで電池を満
充電するように、スイッチング素子３をオンオフに制御
する。The full charge circuit 8 controls the switching element 3 to be turned on and off so that the battery is fully charged in the full charge mode.
【００２３】さらに、図に示す制御回路４は、電池の残
容量を検出する残容量検出回路１１を備える。この残容
量検出回路１１は、電池の電圧から電池の残容量を検出
する。このように、残容量検出回路１１を備える充電器
は、演算回路を内蔵しないパック電池を装着して、残容
量を検出しながら充放電できる。Further, the control circuit 4 shown in the figure has a remaining capacity detecting circuit 11 for detecting the remaining capacity of the battery. The remaining capacity detection circuit 11 detects the remaining capacity of the battery from the voltage of the battery. As described above, the charger including the remaining capacity detection circuit 11 can charge and discharge while detecting the remaining capacity by mounting the battery pack having no built-in arithmetic circuit.
【００２４】通信回路６は、パック電池１２に接続され
て、パック電池１２と通信する。パック電池１２は、通
信回路６を介して電池の残容量を充電器１に出力する。
このパック電池１２は、二次電池１３の残容量を演算す
る演算回路１４を備える。演算回路１４は、電池の充電
容量から放電容量を減算して電池の残容量を演算する。
充電容量は、充電電流の積算値に充電効率をかけて演算
される。放電容量は、放電電流の積算値に放電効率をか
けて演算される。演算回路１４を内蔵するパック電池１
２は、電池の残容量を正確に演算して充電器に出力でき
る。パック電池１２から入力される残容量に基づいて電
池を充放電する充電器は、電池の残容量を正確に制御し
ながら充放電できる。The communication circuit 6 is connected to the battery pack 12 and communicates with the battery pack 12. The battery pack 12 outputs the remaining capacity of the battery to the charger 1 via the communication circuit 6.
The battery pack 12 includes an arithmetic circuit 14 for calculating the remaining capacity of the secondary battery 13. The arithmetic circuit 14 calculates the remaining capacity of the battery by subtracting the discharge capacity from the charge capacity of the battery.
The charge capacity is calculated by multiplying the integrated value of the charge current by the charge efficiency. The discharge capacity is calculated by multiplying the integrated value of the discharge current by the discharge efficiency. Battery pack 1 incorporating arithmetic circuit 14
2 can accurately calculate the remaining capacity of the battery and output it to the charger. The charger that charges and discharges the battery based on the remaining capacity input from the battery pack 12 can charge and discharge while accurately controlling the remaining capacity of the battery.
【００２５】以上の充電器は、以下の動作をして電池を
充電する。切換スイッチ１０を有する充電器１は、ユー
ザーが切換スイッチ１０を操作して、保存充放電回路７
と満充電回路８を選択する。切換スイッチのない充電器
は、不使用時間をタイマーでカウントし、不使用時間が
設定時間よりも長いと切換回路が保存充放電回路を選択
し、不使用時間が設定時間よりも短いと満充電回路が選
択される。The above charger performs the following operations to charge the battery. The charger 1 having the changeover switch 10 allows the user to operate the changeover switch 10 to operate the storage charge / discharge circuit 7.
And the full charge circuit 8 is selected. Chargers without a changeover switch count the non-use time with a timer.If the non-use time is longer than the set time, the switching circuit selects the storage charge / discharge circuit, and if the non-use time is shorter than the set time, it is fully charged. The circuit is selected.
【００２６】切換回路９が保存充放電回路７を選択する
と、保存充放電回路７はスイッチング素子３と放電回路
５を制御して、保存モードで電池の残容量が保存容量と
なるように充放電する。保存充放電回路７は、電池の残
容量を検出し、残容量が保存容量となるように電池を充
放電する。電池の残容量は、パック電池１２の演算回路
１４で演算された残容量を通信回路６で検出し、あるい
は残容量検出回路１１で電池の電圧から検出する。電池
の残容量が保存容量よりも大きいと、スイッチング素子
３をオフにして放電回路５の放電スイッチをオンとして
電池を放電させる。電池の残容量が保存容量になると放
電スイッチをオフにして放電を停止させる。電池の残容
量が保存容量よりも小さいと、スイッチング素子３をオ
ンにして放電回路５の放電スイッチをオフとして電池を
充電する。電池の残容量が保存容量になるとスイッチン
グ素子３をオフにして充電を停止させる。その後、放電
スイッチとスイッチング素子３の両方はオフに保持され
る。When the switching circuit 9 selects the storage charge / discharge circuit 7, the storage charge / discharge circuit 7 controls the switching element 3 and the discharge circuit 5 to charge / discharge in the storage mode so that the remaining capacity of the battery becomes the storage capacity. I do. The storage charge / discharge circuit 7 detects the remaining capacity of the battery and charges / discharges the battery so that the remaining capacity becomes the storage capacity. The remaining capacity of the battery is detected by the communication circuit 6 based on the remaining capacity calculated by the arithmetic circuit 14 of the battery pack 12 or detected from the battery voltage by the remaining capacity detection circuit 11. When the remaining capacity of the battery is larger than the storage capacity, the switching element 3 is turned off and the discharge switch of the discharge circuit 5 is turned on to discharge the battery. When the remaining capacity of the battery reaches the storage capacity, the discharging switch is turned off to stop discharging. When the remaining capacity of the battery is smaller than the storage capacity, the switching element 3 is turned on and the discharge switch of the discharge circuit 5 is turned off to charge the battery. When the remaining capacity of the battery reaches the storage capacity, the switching element 3 is turned off to stop charging. Thereafter, both the discharge switch and the switching element 3 are kept off.
【００２７】切換回路９が満充電回路８を選択すると、
保存充放電回路７はスイッチング素子３のみを制御し
て、満充電モードで電池が満充電されるまで充電する。
電池の満充電は、パック電池１２の演算回路１４で演算
されて通信回路６から入力され、あるいは残容量検出回
路１１で電池の電圧から検出される。電池が満充電され
ると、スイッチング素子３をオフにして充電を停止す
る。その後、スイッチング素子３はオフ状態に保持され
る。When the switching circuit 9 selects the full charge circuit 8,
The storage charge / discharge circuit 7 controls only the switching element 3 to charge the battery in the full charge mode until the battery is fully charged.
The full charge of the battery is calculated by the calculation circuit 14 of the battery pack 12 and input from the communication circuit 6 or detected by the remaining capacity detection circuit 11 from the voltage of the battery. When the battery is fully charged, the switching element 3 is turned off to stop charging. After that, the switching element 3 is kept in the off state.
【００２８】[0028]
【発明の効果】本発明の充電器は、リチウムイオン二次
電池を理想的な状態で長期保存でき、保存中における電
池の性能低下を極減できる特長がある。それは、本発明
の充電器が、電池の残容量が完全放電容量よりも大きく
て満充電容量よりも小さい保存容量となるように電池を
充放電する保存充放電回路と、電池を満充電する満充電
回路とを備えているからである。この充電器は、保存充
放電回路で電池を保存に適した保存容量となるように充
放電できるので、リチウムイオン二次電池を理想的に長
期保存できると共に、保存中における電池の性能低下を
極減できる。さらに、この充電器は、満充電回路で電池
を満充電できるので、電池を長時間使用するときには満
充電して便利に使用できる。The battery charger according to the present invention has a feature that a lithium ion secondary battery can be stored in an ideal state for a long period of time, and a decrease in battery performance during storage can be minimized. The charging and discharging circuit for charging and discharging the battery so that the remaining capacity of the battery is larger than the full discharging capacity and smaller than the full charging capacity, and the charging and discharging circuit for fully charging the battery. This is because a charging circuit is provided. This charger can be charged and discharged to a storage capacity suitable for storage with a storage charge / discharge circuit, so that lithium ion secondary batteries can be ideally stored for a long period of time, and battery performance during storage can be extremely reduced. Can be reduced. Further, since the battery can be fully charged by the full-charge circuit, the battery can be fully charged and used conveniently when the battery is used for a long time.
【図１】リチウムイオン二次電池を長期間放置した後の
復帰容量の特性を示すグラフFIG. 1 is a graph showing characteristics of a return capacity after a lithium ion secondary battery has been left for a long time.
【図２】本発明の一実施例にかかる充電器のブロック図FIG. 2 is a block diagram of a charger according to one embodiment of the present invention.
１…充電器 ２…充電電源 ３…スイッチング素子 ４…制御回路 ５…放電回路 ６…通信回路 ７…保存充放電回路 ８…満充電回路 ９…切換回路 １０…切換スイッチ １１…残容量検出回路 １２…パック電池 １３…二次電池 １４…演算回路 DESCRIPTION OF SYMBOLS 1 ... Charger 2 ... Charging power supply 3 ... Switching element 4 ... Control circuit 5 ... Discharge circuit 6 ... Communication circuit 7 ... Conservation charge / discharge circuit 8 ... Full charge circuit 9 ... Switching circuit 10 ... Changeover switch 11 ... Remaining capacity detection circuit 12 … Pack battery 13… Secondary battery 14… Calculation circuit
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5G003 AA01 BA01 CA03 CB08 EA05 GA01 5H030 AA04 AA08 AA10 AS06 BB01 BB09 BB27 DD00 FF41 FF42 FF52 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5G003 AA01 BA01 CA03 CB08 EA05 GA01 5H030 AA04 AA08 AA10 AS06 BB01 BB09 BB27 DD00 FF41 FF42 FF52
Claims (9)
きくて満充電容量よりも小さい保存容量となるように電
池を充放電する保存充放電回路(7)と、電池を満充電す
る満充電回路(8)とを備えることを特徴とするリチウム
イオン二次電池の充電器。A storage charge / discharge circuit (7) for charging / discharging a battery so that the remaining capacity of the battery is larger than the full discharge capacity and smaller than the full charge capacity, and a full charge / discharge circuit for charging the battery. A charger for a lithium ion secondary battery, comprising: a charging circuit (8).
量検出回路(11)を備える請求項１に記載されるリチウム
イオン二次電池の充電器。2. The battery charger for a lithium ion secondary battery according to claim 1, further comprising a remaining capacity detection circuit for detecting a remaining capacity of the battery by a battery voltage.
池(12)に内蔵される残容量の演算回路(14)と通信する通
信回路(6)を有し、通信回路(6)を介して電池の残容量を
検出して電池を充電する請求項１に記載されるリチウム
イオン二次電池の充電器。The battery is a battery pack (12), and has a communication circuit (6) for communicating with a remaining capacity calculation circuit (14) built in the battery pack (12). The battery charger for a lithium ion secondary battery according to claim 1, wherein the battery is charged by detecting the remaining capacity of the battery via the battery.
の範囲に設定されてなる請求項１に記載されるリチウム
イオン二次電池の充電器。4. The storage capacity is 20 to 70% of the full charge capacity.
The charger for a lithium ion secondary battery according to claim 1, wherein the charger is set in the range of:
載されるリチウムイオン二次電池の充電器。5. The lithium ion secondary battery charger according to claim 4, wherein the storage capacity is a fixed capacity.
るとき、電池の残容量を保存容量として保存充放電回路
(7)が電池を充放電しない請求項１に記載されるリチウ
ムイオン二次電池の充電器。6. A storage charge / discharge circuit wherein the remaining capacity of the battery is used as the storage capacity when the remaining capacity of the battery is in the range of 20 to 70%.
2. The lithium ion secondary battery charger according to claim 1, wherein (7) does not charge and discharge the battery.
り換える切換スイッチ(10)を備え、切換スイッチ(10)で
保存充放電回路(7)と満充電回路(8)とが切り換えられて
電池が充放電される請求項１に記載されるリチウムイオ
ン二次電池の充電器。A changeover switch (10) for switching between a storage charge / discharge circuit (7) and a full charge circuit (8), and the changeover switch (10) is used to switch between the storage charge / discharge circuit (7) and the full charge circuit (8). The battery charger for a lithium ion secondary battery according to claim 1, wherein the battery is charged and discharged by switching.
り換える切換回路(9)を備え、この切換回路(9)は、電池
が使用されない不使用時間をカウントするタイマーを内
蔵しており、不使用時間が設定時間よりも長くなると、
電池を保存充放電回路(7)で充放電する請求項１に記載
されるリチウムイオン二次電池の充電器。8. A switching circuit (9) for switching between a storage charge / discharge circuit (7) and a full charge circuit (8). If the non-use time is longer than the set time,
The charger for a lithium ion secondary battery according to claim 1, wherein the battery is charged / discharged by a storage / charge circuit (7).
８に記載されるリチウムイオン二次電池の充電器。9. The charger for a lithium ion secondary battery according to claim 8, which is incorporated in a device incorporating a battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001165775A JP2002359009A (en) | 2001-05-31 | 2001-05-31 | Charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001165775A JP2002359009A (en) | 2001-05-31 | 2001-05-31 | Charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002359009A true JP2002359009A (en) | 2002-12-13 |
Family
ID=19008407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001165775A Pending JP2002359009A (en) | 2001-05-31 | 2001-05-31 | Charger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002359009A (en) |
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| JP2009502008A (en) * | 2005-07-14 | 2009-01-22 | ボストン−パワー，インコーポレイテッド | Control electronics for Li-ion batteries |
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