JPH11339857A - Discharge control device for secondary battery - Google Patents
Discharge control device for secondary batteryInfo
- Publication number
- JPH11339857A JPH11339857A JP10146248A JP14624898A JPH11339857A JP H11339857 A JPH11339857 A JP H11339857A JP 10146248 A JP10146248 A JP 10146248A JP 14624898 A JP14624898 A JP 14624898A JP H11339857 A JPH11339857 A JP H11339857A
- Authority
- JP
- Japan
- Prior art keywords
- secondary battery
- battery
- residual quantity
- absolute
- discharge
- 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.)
- Withdrawn
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、例えば高温環境下
で満充電処理された二次電池の放電時における電池残量
を正確に求めることのできる二次電池の放電管理装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge management device for a secondary battery, which can accurately determine the remaining amount of a secondary battery that has been fully charged in a high-temperature environment when discharging.
【0002】[0002]
【関連する背景技術】リチウムイオン電池やニッケル水
素電池等の二次電池においては、その満充電処理時にお
ける環境温度に応じた充電制御が行われるので、満充電
される電池容量(絶対残量)が変化する。例えば高温環
境下においては、二次電池自体が本来的に有する電池容
量の80%程度の充電が完了した時点で、これを満充電
と看做して充電処理を停止し、それ以上の充電(過充
電)による電池特性の劣化を防ぐような充電制御が行わ
れる。[Related Background Art] In a secondary battery such as a lithium-ion battery or a nickel-metal hydride battery, charge control is performed in accordance with the environmental temperature at the time of the full charge process, so that the battery capacity to be fully charged (absolute remaining amount) Changes. For example, in a high-temperature environment, when the charging of about 80% of the battery capacity originally possessed by the secondary battery itself is completed, this is regarded as a full charge, the charging process is stopped, and further charging ( Charge control is performed to prevent deterioration of battery characteristics due to overcharging.
【0003】[0003]
【発明が解決しようとする課題】ところでこの種の二次
電池の放電管理は、満充電状態の電池容量(相対残量)
を100%とし、一定の放電効率の下でその放電電流に
応じて電池残量を計算して行われ、例えば残量表示を行
うことで再充電を促す等の処理が行われる。しかしなが
ら二次電池の充電が前述したように高温環境下で行われ
た後に充電した場合、計算によって求められた電池残量
が20%程度であるにも拘わらず、実際の電池残量が零
(0)となることがある。このような事態が生じると、
例えば上記二次電池によって駆動されるパーソナルコン
ピュータが突然作動停止し、そのデータが失われるよう
な事故が発生する虞があり、二次電池に対する信頼性が
著しく損なわれる。By the way, the discharge management of this type of secondary battery is based on the battery capacity (relative remaining amount) in a fully charged state.
Is set to 100%, the remaining battery level is calculated in accordance with the discharge current under a certain discharge efficiency, and processing such as prompting recharging by displaying the remaining level is performed. However, when the secondary battery is charged after being charged in a high-temperature environment as described above, the actual remaining battery capacity is zero (in spite of the fact that the calculated remaining battery capacity is about 20%). 0). When this happens,
For example, a personal computer driven by the secondary battery may suddenly stop operating, causing an accident that data may be lost, and the reliability of the secondary battery may be significantly impaired.
【0004】本発明はこのような事情を考慮してなされ
たもので、その目的は、二次電池の満充電状態に拘わる
ことなしに、その放電時における電池残量を正確に求め
ることのできる二次電池の放電管理装置を提供すること
にある。The present invention has been made in view of such circumstances, and an object of the present invention is to accurately determine a remaining battery amount at the time of discharging a secondary battery without being concerned with a fully charged state of the secondary battery. An object of the present invention is to provide a discharge management device for a secondary battery.
【0005】[0005]
【課題を解決するための手段】上述した目的を達成する
べく本発明に係る二次電池の放電管理装置は、二次電池
を満充電処理した際の絶対残量を記憶する手段と、該二
次電池の放電時における放電効率を前記絶対残量に応じ
て変化させてその電池残量を求める手段とを具備したこ
とを特徴としている。In order to achieve the above-mentioned object, a secondary battery discharge management device according to the present invention comprises means for storing an absolute remaining amount when a secondary battery is fully charged. Means for changing the discharge efficiency at the time of discharging the next battery in accordance with the absolute remaining amount to obtain the remaining battery amount.
【0006】即ち、満充電処理された二次電池の絶対残
量に応じて、その放電効率を変化させることで、満充電
状態の相対残量を100%として放電時の残量を管理す
る場合であっても、その電池残量を正確に把握し得るよ
うにしたことを特徴としている。In other words, when the discharge efficiency is changed in accordance with the absolute remaining amount of a secondary battery that has been fully charged, the relative remaining amount in a fully charged state is managed as 100% to manage the remaining amount during discharging. However, the present invention is characterized in that the remaining battery level can be accurately grasped.
【0007】[0007]
【発明の実施の形態】以下、図面を参照して本発明の一
実施形態に係る二次電池の放電管理装置について説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a discharge management device for a secondary battery according to an embodiment of the present invention will be described with reference to the drawings.
【0008】図1は放電管理装置を備えた二次電池の充
放電回路の概略的な構成を示すもので、BATはリチウ
ムイオン電池やニッケル水素電池等の二次電池、1は定
電流−定電圧特性を有して上記二次電池BATの充電に
供される充電電源、また2は上記二次電池BATを電源
として作動する、例えばパーソナルコンピュータや携帯
電話機等の負荷である。尚、二次電池BATは、単一の
電池セル(素電池)として提供される場合もあるが、複
数の電池セルを直列・並列に組み合わせて構成されるも
のであっても良い。FIG. 1 shows a schematic configuration of a charge / discharge circuit of a secondary battery provided with a discharge management device. BAT is a secondary battery such as a lithium ion battery or a nickel hydride battery, and 1 is a constant current-constant. A charging power supply having a voltage characteristic and used for charging the secondary battery BAT, and 2 is a load, for example, a personal computer or a mobile phone, which operates using the secondary battery BAT as a power supply. The secondary battery BAT may be provided as a single battery cell (unit cell), but may be configured by combining a plurality of battery cells in series and in parallel.
【0009】しかして放電管理装置3は、例えば二次電
池BATに一体に組み込まれて電池パックを構成するフ
ュエルゲージ(FG)回路4が持つ機能の一部として実
現される。尚、上記フュエルゲージ回路4は、二次電池
BATに対する残量表示機能や充放電制御機能、保護機
能等を果たすもので、基本的には前記二次電池BATの
充放電電流を検出する電流検出部4a、該二次電池BA
Tの充電電圧を検出する電圧検出部4b、更に電池温度
を検出する温度検出部4c等を備えている。このフュエ
ルゲージ回路4による充電制御の下で、前記充電電源1
による二次電池BATの充電(満充電処理)が行われ
る。Thus, the discharge management device 3 is realized, for example, as a part of a function of a fuel gauge (FG) circuit 4 which is integrated into a secondary battery BAT and constitutes a battery pack. The fuel gauge circuit 4 performs a remaining amount display function, a charge / discharge control function, a protection function, and the like for the secondary battery BAT, and is basically a current detection for detecting a charge / discharge current of the secondary battery BAT. Part 4a, the secondary battery BA
A voltage detector 4b for detecting the charging voltage of T, a temperature detector 4c for detecting the battery temperature, and the like are provided. Under the charge control by the fuel gauge circuit 4, the charging power source 1
(Full charge processing) of the secondary battery BAT is performed.
【0010】さて放電管理装置3は、満充電処理された
二次電池BATの満充電状態における電池容量(絶対残
量)を検出し、例えばその絶対残量をメモリ3aに記憶
する絶対残量検出部3bを備えている。尚、絶対残量検
出部3bとしては上記絶対残量に応じて充電効率を求
め、この充電効率を前記メモリ3aに記憶するものであ
っても良い。更に前記放電管理装置3は二次電池BAT
の放電時に上記メモリ3bに記憶された絶対残量(或い
は充電効率)に応じて放電効率を設定する放電効率設定
部3cを備えている。残量表示部3dは上記の如く設定
された放電効率の下で前記二次電池BATの放電時にお
ける放電電流量および電池温度に従って該二次電池BA
Tの残量(残された容量)を計算し、これを前記負荷2
に対して通知したり、電池パック使用者に対して残量表
示するものとなっている。The discharge management device 3 detects the battery capacity (absolute remaining amount) of the fully charged secondary battery BAT in a fully charged state, and for example, stores the absolute remaining amount in the memory 3a. A portion 3b is provided. Note that the absolute remaining amount detection unit 3b may calculate the charging efficiency according to the absolute remaining amount and store the charging efficiency in the memory 3a. Further, the discharge management device 3 includes a secondary battery BAT.
A discharge efficiency setting unit 3c for setting the discharge efficiency according to the absolute remaining amount (or charging efficiency) stored in the memory 3b at the time of discharging. The remaining amount display unit 3d displays the secondary battery BA in accordance with the discharge current amount and the battery temperature when discharging the secondary battery BAT under the discharge efficiency set as described above.
The remaining amount of T (remaining capacity) is calculated, and this is
And the remaining amount is displayed to the battery pack user.
【0011】この放電管理装置3の機能とその作用を更
に詳しく説明すると、二次電池BATに対する満充電処
理は、例えば充電電圧を監視しながらその充電電流を充
電時間に応じて積分しながら充電容量を求めて行われ
る。この際、二次電池BATの環境温度に応じて、その
過充電を防ぐべく充電制御が実行される。このような充
電制御により、例えば図2に示すように常温時において
は図中破線で示すように二次電池BATが有する最大充
電容量までその充電が行われるにも拘わらず、高温環境
下においては、上記最大充電容量の80%程度の充電が
なされた時点でこれを満充電状態に到達したと看做し、
その充電が停止される。The function and operation of the discharge management device 3 will be described in more detail. The full charge process for the secondary battery BAT is performed by, for example, monitoring the charge voltage and integrating the charge current according to the charge time while the charge capacity is integrated. It is done in search of. At this time, charging control is executed according to the environmental temperature of the secondary battery BAT to prevent overcharging. By such charge control, for example, at room temperature as shown in FIG. 2, the charge is performed up to the maximum charge capacity of the secondary battery BAT as shown by a broken line in the figure, but in a high temperature environment, When the battery is charged to about 80% of the maximum charging capacity, it is considered that the battery has reached the fully charged state,
The charging is stopped.
【0012】これに対して二次電池BATの放電管理
は、該二次電池BATが満充電されたと言う事実に基づ
き、その充電残量を100%とする相対残量の下で電池
残量を求めながら実行される。一般的には所定の放電効
率の下で該二次電池BATの放電時における放電電流量
と電池温度とに従って前記負荷2にて消費された電池容
量を求め、そのときの二次電池BATにおける残量(残
容量)が何%であるかを算出することでその放電管理が
行われる。従ってこの場合、前述した如く満充電処理が
高温環境下で行われていると、その絶対容量自体が少な
いので、例えば図中破線で示すように電池残量が20%
程度であると認識されるにも拘わらず、実際の電池残量
が零(0)となることがある。On the other hand, the discharge management of the secondary battery BAT is based on the fact that the secondary battery BAT is fully charged, and based on the fact that the remaining battery charge is 100%, the remaining battery charge is reduced. It is executed while asking. In general, the battery capacity consumed by the load 2 is obtained in accordance with a discharge current amount and a battery temperature when discharging the secondary battery BAT under a predetermined discharge efficiency, and a remaining capacity of the secondary battery BAT at that time is obtained. The discharge management is performed by calculating what percentage the amount (remaining capacity) is. Therefore, in this case, when the full charge process is performed in a high-temperature environment as described above, the absolute capacity itself is small, and therefore, for example, as shown by a broken line in the drawing, the remaining battery capacity is 20%
Despite being recognized as being on the order, the actual remaining battery level may be zero (0).
【0013】そこで本発明に係る放電管理装置3におい
ては、満充電処理された二次電池BATの満充電状態に
おける絶対残量(或いは充電効率)をメモリ3aに記憶
しておき、その絶対残量(或いは充電効率)に応じて放
電時における放電効率を可変設定するものとなってい
る。具体的には図2に示すように満充電時における絶対
残量が低いとき、これに応じて放電効率を高く設定する
ことで放電電流に対して求められる消費容量を大きく
し、その残量を正確に求めるものとなっている。換言す
れば、図2に斜線を付した領域の面積として示されるよ
うに、満充電処理により充電した容量Aと、放電によっ
て消費される容量Bとが等しくなるようにその放電効率
を設定するものとなっている。Therefore, in the discharge management device 3 according to the present invention, the absolute remaining amount (or charging efficiency) of the fully charged secondary battery BAT in the fully charged state is stored in the memory 3a, and the absolute remaining amount is stored. (Or charging efficiency), the discharging efficiency at the time of discharging is variably set. Specifically, as shown in FIG. 2, when the absolute remaining amount at the time of full charge is low, the discharge capacity is set to a high value to increase the consumption capacity required for the discharge current. It is exactly what you want. In other words, as shown by the area of the shaded region in FIG. 2, the discharge efficiency is set so that the capacity A charged by the full charge process and the capacity B consumed by the discharge become equal. It has become.
【0014】かくしてこのように構成された放電管理装
置によれば、二次電池BATに対する満充電処理がどの
ような温度環境において実行されたかに拘わらず、その
満充電状態における電池容量の絶対残量に応じて放電効
率が設定されるので、満充電状態を100%とする相対
残量の下で該二次電池BATの放電を管理する場合であ
っても、その残量を正確に把握することができる。従っ
て相対残量が20%程度残っていると判定されるにも拘
わらず、実際の電池容量が零(0)となっている等の不
具合を効果的に回避することが可能となる。According to the discharge management apparatus thus configured, regardless of the temperature environment in which the full charge process is performed on the secondary battery BAT, the absolute remaining battery capacity in the full charge state Since the discharge efficiency is set in accordance with the following equation, even when the discharge of the secondary battery BAT is managed under the relative remaining amount where the fully charged state is 100%, it is necessary to accurately grasp the remaining amount. Can be. Therefore, it is possible to effectively avoid such a problem that the actual battery capacity is zero (0) even though it is determined that the relative remaining amount is about 20%.
【0015】特に二次電池BATの充電処理が高温環境
下で行われた場合であっても、該二次電池BATの使用
時(放電時)には、通常、その充電状況を知る術がな
く、単に残量表示される相対残量に基づいて上記二次電
池BATの再充電時期を管理することしかできないの
で、上述した如く可変設定された放電効率の下で電池残
量が求められる本装置によれば、二次電池BATの使用
を効果的に管理することができ、また二次電池BATに
対する信頼性についても充分高めることが可能となる。In particular, even when the charging process of the secondary battery BAT is performed in a high-temperature environment, when the secondary battery BAT is used (during discharge), there is usually no way to know its charging status. However, since the recharge time of the secondary battery BAT can only be managed based on the relative remaining amount indicated by the remaining amount, the present apparatus in which the remaining amount of the battery is obtained under the variably set discharge efficiency as described above. According to this, the use of the secondary battery BAT can be effectively managed, and the reliability of the secondary battery BAT can be sufficiently improved.
【0016】尚、本発明は上述した実施形態に限定され
るものではない。例えば二次電池BATにその満充電処
理時における絶対残量を記憶するメモリ機能だけを持た
せ、該二次電池BATが装着される負荷2側に設けられ
た放電管理装置において、上記絶対残量を読み出して放
電効率を可変設定して電池残量を管理するようにしても
良い。その他、本発明はその要旨を逸脱しない範囲で種
々変形して実施することができる。The present invention is not limited to the above embodiment. For example, the secondary battery BAT is provided only with a memory function for storing the absolute remaining amount at the time of the full charge process, and in the discharge management device provided on the load 2 side to which the secondary battery BAT is attached, May be read and the discharge efficiency is variably set to manage the remaining battery level. In addition, the present invention can be variously modified and implemented without departing from the gist thereof.
【0017】[0017]
【発明の効果】以上説明したように本発明によれば、二
次電池を満充電処理した際の絶対残量を記憶しておき、
該二次電池の放電時における放電効率を前記絶対残量に
応じて変化させてその電池残量を求めるので、該二次電
池の充電処理時の温度環境に拘わることなく電池残量を
高精度に求めて精度の良い放電管理が可能となる。特に
満充電状態の相対残量を100%として放電時の残量を
一元的に管理する場合であってもその電池残量を正確に
把握することができ、二次電池に対する信頼性を十分に
確保することができる等の効果が奏せられる。As described above, according to the present invention, the absolute remaining amount when the secondary battery is fully charged is stored,
Since the discharge efficiency at the time of discharging the secondary battery is changed in accordance with the absolute remaining amount to obtain the remaining amount of the battery, the remaining amount of the battery can be accurately determined regardless of the temperature environment at the time of charging the secondary battery. And accurate discharge management is possible. In particular, even when the relative remaining amount in the fully charged state is set to 100% and the remaining amount at the time of discharging is centrally managed, the remaining amount of the battery can be accurately grasped, and the reliability of the secondary battery is sufficiently improved. The effect of being able to secure it is exhibited.
【図1】本発明の一実施形態に係る二次電池の放電管理
装置を備えた充放電回路の概略的な構成を示す図。FIG. 1 is a diagram illustrating a schematic configuration of a charge / discharge circuit including a discharge management device for a secondary battery according to an embodiment of the present invention.
【図2】本発明に係る放電管理装置の機能とその作用を
概念的に示す図。FIG. 2 is a diagram conceptually showing functions and operations of a discharge management device according to the present invention.
BAT 二次電池 1 充電装置 2 負荷 3 放電管理装置 3a メモリ 3b 絶対残量検出部 3c放電効率設定部 3d 残量表示部 4 フュエルゲージ回路 BAT Secondary battery 1 Charging device 2 Load 3 Discharge management device 3a Memory 3b Absolute remaining amount detection unit 3c Discharge efficiency setting unit 3d Remaining amount display unit 4 Fuel gauge circuit
Claims (1)
を記憶する手段と、該二次電池の放電時における放電効
率を前記絶対残量に応じて変化させてその電池残量を求
める手段とを具備したことを特徴とする二次電池の放電
管理装置。1. A means for storing an absolute remaining amount when a secondary battery is fully charged, and changing a discharge efficiency at the time of discharging the secondary battery in accordance with the absolute remaining amount to change the battery remaining amount. A discharge management device for a secondary battery, comprising:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10146248A JPH11339857A (en) | 1998-05-27 | 1998-05-27 | Discharge control device for secondary battery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10146248A JPH11339857A (en) | 1998-05-27 | 1998-05-27 | Discharge control device for secondary battery |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH11339857A true JPH11339857A (en) | 1999-12-10 |
Family
ID=15403451
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10146248A Withdrawn JPH11339857A (en) | 1998-05-27 | 1998-05-27 | Discharge control device for secondary battery |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH11339857A (en) |
-
1998
- 1998-05-27 JP JP10146248A patent/JPH11339857A/en not_active Withdrawn
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