JP2002118974A - Battery pack - Google Patents
Battery packInfo
- Publication number
- JP2002118974A JP2002118974A JP2000303275A JP2000303275A JP2002118974A JP 2002118974 A JP2002118974 A JP 2002118974A JP 2000303275 A JP2000303275 A JP 2000303275A JP 2000303275 A JP2000303275 A JP 2000303275A JP 2002118974 A JP2002118974 A JP 2002118974A
- Authority
- JP
- Japan
- Prior art keywords
- output
- secondary battery
- capacitor
- constant
- 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.)
- 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
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
Description
【発明の属する技術分野】本発明は、二次電圧の急激な
出力低下による出力特性の低下を防ぐ電池パックに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack for preventing a drop in output characteristics due to a sharp drop in the output of a secondary voltage.
【従来の技術及び発明が解決しようとする課題】二次電
池では、高負荷接続時や低温時、放電容量の低下時の内
部インピーダンス等の影響により急激な出力低下が生
じ、二次電池の放電能力を有効に使い切ることができな
いなどの問題がある。パルス放電時においても同様の問
題がある。そこで、従来の二次電池を供給源とする電源
回路においては、電池のパルス放電時のパルス波形の改
善のため、大容量のキャパシタ（電気二重層キャパシタ
等）を並列に接続し、誘導負荷等の高負荷出力に対応す
ることが考えられている。しかし、このような従来の対
応では、 大容量のキャパシタを接続しなければならない 電池の出力能力を最大限出力させることが困難 等の問題があった。例えば特開平６−４６５３２号公報
に提案されている電源装置では、パソコン、ワープロな
どの機器において、ディスク・ドライブが動作したとき
電源電圧が著しく低下して、誤動作や動作不能に陥らな
いように電気二重層コンデンサを電池と並列に接続して
いるが、結果として、電池の放電能力低下と共に電気二
重層コンデンサにチャージされる電荷量も低下するた
め、電池出力を最大限利用されていない。また、特開平
６−２９１７１０号公報に提案されている携帯電話機で
は、昇圧回路を用いて電池の出力を昇圧し、その出力電
圧を定電圧回路で定電圧化するものであり、電池出力を
そのまま昇圧して使用するため、電池自体の出力を改善
していることにはならない。2. Description of the Related Art In a secondary battery, when a high load is connected, at a low temperature, or when the discharge capacity is reduced, the output suddenly drops due to the influence of internal impedance and the like. There are problems such as the inability to use up abilities effectively. There is a similar problem during pulse discharge. Therefore, in a conventional power supply circuit using a secondary battery as a supply source, a large-capacity capacitor (such as an electric double layer capacitor) is connected in parallel to improve a pulse waveform at the time of pulse discharge of the battery, and an inductive load or the like is provided. It is considered to correspond to high load output. However, such conventional measures had problems such as difficulty in maximizing the output capability of the battery, which requires connection of a large-capacity capacitor. For example, in a power supply device proposed in Japanese Patent Application Laid-Open No. 6-46532, in a device such as a personal computer or a word processor, when a disk drive is operated, the power supply voltage is remarkably reduced so that a malfunction or inoperability is prevented. Although the double-layer capacitor is connected in parallel with the battery, as a result, the amount of electric charge charged to the electric double-layer capacitor decreases along with the decrease in the discharge capacity of the battery, so that the battery output is not used to the maximum. In the portable telephone proposed in Japanese Patent Application Laid-Open No. 6-291710, the output of a battery is boosted by using a booster circuit, and the output voltage is made constant by a constant voltage circuit. Since the battery is used after boosting, it does not mean that the output of the battery itself has been improved.
【課題を解決するための手段】本発明は、上記課題を解
決するものであって、二次電池の内部インピーダンス等
の影響による急激な出力低下を抑えるものである。その
ために本発明は、二次電池と、前記二次電池の出力を昇
圧する昇圧回路と、前記昇圧回路に並列に接続され昇圧
した出力により充電されるキャパシタと、前記キャパシ
タの放電出力を定電圧化する定電圧レギュレータと、前
記定電圧レギュレータの出力を前記二次電池の出力側に
結合する逆流防止用ダイオードとを備え、前記二次電圧
の急激な出力低下を前記逆流防止用ダイオードを介して
前記定電圧レギュレータで補うように構成したことを特
徴とし、前記二次電池は、リチウムイオン二次電池であ
り、前記キャパシタは、大容量の電気二重層コンデンサ
であることを特徴とするものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended to suppress a sudden decrease in output due to the influence of the internal impedance of a secondary battery. For this purpose, the present invention provides a secondary battery, a booster circuit for boosting the output of the secondary battery, a capacitor connected in parallel to the booster circuit and charged by the boosted output, and a discharge output of the capacitor having a constant voltage. A constant-voltage regulator that converts the output of the constant-voltage regulator to an output side of the secondary battery, and a steep drop in the output of the secondary voltage is reduced via the reverse-flow prevention diode. The secondary battery is a lithium-ion secondary battery, and the capacitor is a large-capacity electric double-layer capacitor. .
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照しつつ説明する。図１は本発明に係る電池パック
の実施の形態を説明するための図であり、１は二次電
池、２は昇圧回路、３はキャパシタ、４は定電圧レギュ
レータ、５は逆流防止用ダイオードを示す。図１におい
て、二次電池１は、リチウムイオン電池であり、昇圧回
路２は、二次電池１の出力電圧Ｖｏを所定の電圧Ｖ１
（＝ｎＶｏ）に昇圧する、ＤＣ／ＤＣコンバータ等で、
例えばリチウムイオン二次電池からの出力電圧をチャー
ジポンプ等の手段により昇圧できるＩＣ素子で、効率的
に電圧変換を行える素子である。キャパシタ３は、大容
量の電荷を蓄積する、例えば電気二重層コンデンサから
なり、昇圧回路２の出力に並列に接続され昇圧された電
圧を充電するものである。定電圧レギュレータ４は、キ
ャパシタ３からの放電出力を定電圧化するものであり、
逆流防止用ダイオード５は、定電圧レギュレータ４から
の定電圧出力Ｖ３を二次電池１の出力Ｖｏと結合するこ
とにより、二次電池１の出力の低下を定電圧レギュレー
タ４からの定電圧出力で補うようにするものである。上
記昇圧回路２を通してキャパシタ３に充電される電荷量
Ｑは、キャパシタ３のキャパシタンスをＣとすると、Ｑ
＝ＣＶ１＝ＣｎＶｏとなり、昇圧回路２のない場合に比
べてｎ倍の電荷を蓄積することができる。いま、キャパ
シタ３の蓄積する必要電荷量がＱ′＝ＣＶｏ程度であれ
ば、キャパシタ３の容量Ｃを低減することができ、すな
わち上記のように昇圧回路２の出力で充電することによ
り低容量のキャパシタを選択することも可能になる。次
に、上記構成の本発明の電池パックについて動作及びそ
の特性を説明する。図２は二次電池と昇圧回路と定電圧
レギュレータの出力波形を示す図、図３はパルス放電時
のリチウムイオン二次電池単体の放電特性及び電池パッ
クの出力特性を示す図である。図２において、Ａ部の出
力波形Ｖｏは、リチウムイオン二次電池１からのパルス
波形を示し、電圧Ｖｏの出力となる。波形は、高負荷
時、もしくは電池容量低下時を想定し、波形立ち上がり
が歪んだ場合である。これに対し、Ｂの出力波形は、昇
圧回路２にて昇圧されたパルス波形で、リップル分及び
昇圧分がキャパシタ３に充電される。充電された電荷
は、定電圧レギュレータ４を経由してＣ部にてＡベクト
ルのパルス出力と合成される。その波形を示したのがＣ
部の出力波形である。本発明では、二次電池１の出力を
昇圧回路２で昇圧し、昇圧した電圧でキャパシタ３を充
電し定電圧レギュレータ４で定電圧化し逆流防止用ダイ
オード５を介して、二次電池１の出力側に結合するた
め、図２にＣ部の出力波形で示すように波形の立ち上が
りが合成出力により改善され、より急峻に立ち上がって
いることが分かる。パルス放電時のリチウムイオン二次
電池単体の放電特性は、図３に示す特性曲線Ａであり、
本発明の電池パックによる出力特性は、図３に示す特性
曲線Ｂである。ここで、横軸Ｔは時間軸であり、縦軸Ｖ
は電圧である。これらの特性曲線によれば、有効出力電
圧（最低電圧）をＶ１とすると、本発明の電池パックの
場合の特性曲線における初期電圧ＶｏからＶ１となるま
での継続時間ｔ１は、リチウムイオン二次電池単体の放
電時間ｔ０よりも長く、出力特性が改善されていること
が分かる。なお、本発明は、上記実施の形態に限定され
るものではなく、種々の変形が可能である。例えば上記
実施の形態では、昇圧回路に並列にキャパシタを接続し
て昇圧した電圧でキャパシタの充電を行うようにした
が、昇圧回路の出力回路とキャパシタとの間にリアクタ
Ｌを接続したり、適宜回路素子を挿入接続してもよいこ
とはいうまでもない。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view for explaining an embodiment of a battery pack according to the present invention, wherein 1 is a secondary battery, 2 is a booster circuit, 3 is a capacitor, 4 is a constant voltage regulator, and 5 is a reverse current prevention diode. Show. In FIG. 1, a secondary battery 1 is a lithium ion battery, and a booster circuit 2 outputs an output voltage Vo of the secondary battery 1 to a predetermined voltage V1.
(= NVo) with a DC / DC converter, etc.
For example, it is an IC element capable of boosting the output voltage from a lithium ion secondary battery by means such as a charge pump or the like, and is an element capable of efficiently performing voltage conversion. The capacitor 3 is composed of, for example, an electric double layer capacitor that stores a large amount of electric charge, and is connected in parallel to the output of the booster circuit 2 and charges a boosted voltage. The constant voltage regulator 4 converts the discharge output from the capacitor 3 into a constant voltage.
The backflow prevention diode 5 combines the constant voltage output V3 from the constant voltage regulator 4 with the output Vo of the secondary battery 1 to reduce the output of the secondary battery 1 with the constant voltage output from the constant voltage regulator 4. This is to make up for it. Assuming that the capacitance of the capacitor 3 is C, the charge amount Q charged to the capacitor 3 through the booster circuit 2 is Q
= CV1 = CnVo, and it is possible to accumulate n times the electric charge as compared with the case without the booster circuit 2. Now, if the required amount of charge stored in the capacitor 3 is about Q '= CVo, the capacitance C of the capacitor 3 can be reduced. That is, by charging with the output of the booster circuit 2 as described above, a low capacitance can be obtained. It is also possible to select a capacitor. Next, the operation and characteristics of the battery pack of the present invention having the above configuration will be described. FIG. 2 is a diagram showing output waveforms of a secondary battery, a booster circuit, and a constant voltage regulator, and FIG. 3 is a diagram showing discharge characteristics of a lithium ion secondary battery alone and output characteristics of a battery pack during pulse discharge. In FIG. 2, an output waveform Vo of the portion A indicates a pulse waveform from the lithium ion secondary battery 1 and is an output of the voltage Vo. The waveform is a case where the waveform rise is distorted assuming a high load or a low battery capacity. On the other hand, the output waveform of B is a pulse waveform boosted by the boosting circuit 2, and the ripple component and the boosted component are charged in the capacitor 3. The charged electric charges are combined with the pulse output of the A vector in the C section via the constant voltage regulator 4. The waveform is shown in C
5 is an output waveform of a unit. In the present invention, the output of the secondary battery 1 is boosted by the booster circuit 2, the capacitor 3 is charged with the boosted voltage, the voltage is made constant by the constant voltage regulator 4, and the output of the secondary battery 1 is passed through the backflow prevention diode 5. It can be seen that the rising edge of the waveform is improved by the combined output, as shown by the output waveform of the portion C in FIG. The discharge characteristic of the lithium ion secondary battery alone at the time of pulse discharge is a characteristic curve A shown in FIG.
The output characteristic of the battery pack of the present invention is a characteristic curve B shown in FIG. Here, the horizontal axis T is a time axis, and the vertical axis V
Is the voltage. According to these characteristic curves, assuming that the effective output voltage (minimum voltage) is V1, the duration t1 from the initial voltage Vo to V1 in the characteristic curve of the battery pack of the present invention is equal to the lithium ion secondary battery. It can be seen that the output characteristics are improved, which is longer than the discharge time t0 of the simple substance. Note that the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, the capacitor is connected in parallel with the booster circuit and the capacitor is charged with the boosted voltage. However, the reactor L is connected between the output circuit of the booster circuit and the capacitor, It goes without saying that circuit elements may be inserted and connected.
【発明の効果】以上の説明から明らかなように、本発明
によれば、二次電池と、二次電池の出力を昇圧する昇圧
回路と、昇圧回路に並列に接続され昇圧した出力により
充電されるキャパシタと、キャパシタの放電出力を定電
圧化する定電圧レギュレータと、定電圧レギュレータの
出力を二次電池の出力側に結合する逆流防止用ダイオー
ドとを備え、二次電圧の急激な出力低下を逆流防止用ダ
イオードを介して定電圧レギュレータで補うように構成
したので、高負荷接続時の出力特性を改善し、低温時や
二次電池の放電容量低下時の内部インピーダンス等の影
響による急激な出力低下を抑え、二次電池の放電能力を
有効に使い切ることができ、さらには、パルス放電時の
出力特性を改善し、パルス放電有効出力時間を改善する
ことができる。しかも、昇圧した電圧でキャパシタを充
電するので、低容量のキャパシタを選択することができ
る。As is apparent from the above description, according to the present invention, the secondary battery, the booster circuit for boosting the output of the secondary battery, and the booster circuit connected in parallel to the booster circuit and charged by the boosted output. A constant voltage regulator that makes the discharge output of the capacitor a constant voltage, and a backflow prevention diode that couples the output of the constant voltage regulator to the output side of the secondary battery. It is configured to supplement with a constant voltage regulator via a diode for preventing backflow, so the output characteristics at the time of high load connection are improved, and sudden output due to the influence of internal impedance at low temperature or when the discharge capacity of the secondary battery is reduced It is possible to suppress the reduction and to effectively use up the discharge capacity of the secondary battery. Further, it is possible to improve the output characteristics at the time of pulse discharge and to improve the pulse discharge effective output time. In addition, since the capacitor is charged with the boosted voltage, a low-capacity capacitor can be selected.
【図１】 本発明に係る電池パックの実施の形態を説明
するための図である。FIG. 1 is a diagram illustrating an embodiment of a battery pack according to the present invention.
【図２】 二次電池と昇圧回路と定電圧レギュレータの
出力波形を示す図である。FIG. 2 is a diagram showing output waveforms of a secondary battery, a booster circuit, and a constant voltage regulator.
【図３】 パルス放電時のリチウムイオン二次電池単体
の放電特性及び電池パックの出力特性を示す図である。FIG. 3 is a diagram showing discharge characteristics of a lithium ion secondary battery alone and output characteristics of a battery pack during pulse discharge.
１…二次電池、２…昇圧回路、３…キャパシタ、４…定
電圧レギュレータ、５…逆流防止用ダイオードDESCRIPTION OF SYMBOLS 1 ... Secondary battery, 2 ... Booster circuit, 3 ... Capacitor, 4 ... Constant voltage regulator, 5 ... Backflow prevention diode
Claims (3)
する昇圧回路と、前記昇圧回路に並列に接続され昇圧し
た出力により充電されるキャパシタと、前記キャパシタ
の放電出力を定電圧化する定電圧レギュレータと、前記
定電圧レギュレータの出力を前記二次電池の出力側に結
合する逆流防止用ダイオードとを備え、前記二次電圧の
急激な出力低下を前記逆流防止用ダイオードを介して前
記定電圧レギュレータで補うように構成したことを特徴
とする電池パック。1. A rechargeable battery, a booster circuit for boosting the output of the rechargeable battery, a capacitor connected in parallel to the booster circuit and charged by the boosted output, and making the discharge output of the capacitor a constant voltage. A constant-voltage regulator, and a backflow prevention diode that couples the output of the constant-voltage regulator to the output side of the secondary battery, wherein the rapid output drop of the secondary voltage is reduced via the backflow prevention diode. A battery pack characterized in that it is configured to supplement with a constant voltage regulator.
池であることを特徴とする請求項１記載の電池パック。2. The battery pack according to claim 1, wherein the secondary battery is a lithium ion secondary battery.
コンデンサであることを特徴とする請求項１記載の電池
パック。3. The battery pack according to claim 1, wherein the capacitor is a large-capacity electric double layer capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000303275A JP2002118974A (en) | 2000-10-03 | 2000-10-03 | Battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000303275A JP2002118974A (en) | 2000-10-03 | 2000-10-03 | Battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002118974A true JP2002118974A (en) | 2002-04-19 |
Family
ID=18784495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000303275A Pending JP2002118974A (en) | 2000-10-03 | 2000-10-03 | Battery pack |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002118974A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006325331A (en) * | 2005-05-19 | 2006-11-30 | Matsushita Electric Ind Co Ltd | Discharging circuit for secondary battery and secondary battery pack equipped with the same, and electronic equipment |
| KR100743528B1 (en) | 2006-03-31 | 2007-07-30 | (주)서울전원시스템 | Apparatus for reducing power consumption of power supply |
| CN100337382C (en) * | 2003-04-04 | 2007-09-12 | 京东方科技集团股份有限公司 | Assembled battery whose voltage can be constantly controlled |
| WO2014087475A1 (en) * | 2012-12-04 | 2014-06-12 | ボルボ ラストバグナー アクチエボラグ | Power supply apparatus |
-
2000
- 2000-10-03 JP JP2000303275A patent/JP2002118974A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100337382C (en) * | 2003-04-04 | 2007-09-12 | 京东方科技集团股份有限公司 | Assembled battery whose voltage can be constantly controlled |
| JP2006325331A (en) * | 2005-05-19 | 2006-11-30 | Matsushita Electric Ind Co Ltd | Discharging circuit for secondary battery and secondary battery pack equipped with the same, and electronic equipment |
| KR100743528B1 (en) | 2006-03-31 | 2007-07-30 | (주)서울전원시스템 | Apparatus for reducing power consumption of power supply |
| WO2014087475A1 (en) * | 2012-12-04 | 2014-06-12 | ボルボ ラストバグナー アクチエボラグ | Power supply apparatus |
| JP5899330B2 (en) * | 2012-12-04 | 2016-04-06 | ボルボトラックコーポレーション | Power supply |
| US9520806B2 (en) | 2012-12-04 | 2016-12-13 | Volvo Truck Corporation | Power supply device for supplying power to a load by combining a secondary battery and a capacitor |
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