JP2000195560A - Battery pack - Google Patents
Battery packInfo
- Publication number
- JP2000195560A JP2000195560A JP10371253A JP37125398A JP2000195560A JP 2000195560 A JP2000195560 A JP 2000195560A JP 10371253 A JP10371253 A JP 10371253A JP 37125398 A JP37125398 A JP 37125398A JP 2000195560 A JP2000195560 A JP 2000195560A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- battery pack
- overcurrent
- charge
- secondary 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.)
- 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]
【発明の属する技術分野】本発明は、移動通信機、ビデ
オムービおよびノートパソコンなどに用いられる二次電
池、例えばリチウム電池を具備した電池パックに関す
る。さらに詳しくは、本発明は、特に電池の過充電およ
び過放電を検出し、過充放電時に前記二次電池を保護す
るための回路を備えた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 having a secondary battery, for example, a lithium battery, used for a mobile communication device, a video movie, a notebook personal computer, and the like. More specifically, the present invention particularly relates to a battery pack including a circuit for detecting overcharge and overdischarge of a battery and protecting the secondary battery during overcharge and overdischarge.
【０００２】[0002]
【従来の技術】従来から、移動通信機、ビデオムービお
よびノートパソコンなどで利用されている二次電池とし
ては、例えばリチウム二次電池などが用いられている。
この二次電池を充電する場合、過充電を行うと金属リチ
ウムが析出し、電解液が分解してガスを発生したり、ま
たは、電池内部で短絡を起こして危険であるという問題
がある。そこで、このような問題に対して、従来から種
々の二次電池用保護回路が提案されている。このような
保護回路においては、制御回路により、充電時、電池電
圧が充電禁止電圧にまで上昇した場合、充電を禁止さ
せ、充電禁止電圧より、やや低い基準電圧よりも下がる
と、再度充電を開始させる。また、放電時には、電池電
圧が放電禁止電圧にまで低下すると、放電を禁止させ、
放電禁止電圧よりもやや高い電圧になれば、再度放電を
開始させるのである。2. Description of the Related Art Conventionally, as a secondary battery used in a mobile communication device, a video movie, a notebook personal computer, and the like, for example, a lithium secondary battery has been used.
When charging this secondary battery, there is a problem in that when overcharging is performed, metallic lithium is precipitated and the electrolytic solution is decomposed to generate gas or a short circuit occurs inside the battery, which is dangerous. In order to solve such a problem, various protection circuits for a secondary battery have been conventionally proposed. In such a protection circuit, when the battery voltage rises to the charging prohibition voltage at the time of charging, the charging is prohibited by the control circuit, and when the battery voltage drops below the reference voltage slightly lower than the charging prohibition voltage, charging is started again. Let it. Also, at the time of discharging, when the battery voltage drops to the discharge prohibition voltage, the discharge is prohibited,
When the voltage becomes slightly higher than the discharge prohibition voltage, the discharge is started again.
【０００３】図３に従来の保護回路を含む電池パックの
回路構成図を示す。この電池パックでは素電池を１個含
む場合である。図３に示す保護回路は、素電池３１（例
えば、リチウム二次電池）の充電および放電状態を制御
するための保護ＩＣ３２、電池パック３３内の保護回路
を介して素電池３１を充電器（図示せず）に接続するた
めの＋端子３４および−端子３５を有する。そして、充
電時の温度上昇を制御するためにサーミスタ３６と接続
されている温度端子（Ｔ）３７、また、電池パックを区
別するための識別端子３８（Ｓ）が電池パック３３内に
ある。従来、このサーミスタ３６は、温度の変動により
その抵抗値が変化し（例えば２５℃では１０ＫΩ、６０
℃では３ｋΩ、０℃では２７ｋΩ）、温度検出端子とし
て利用されており、この抵抗値を温度端子（Ｔ）３７を
介して充電器側で認識させる。充電時、素電池が過充電
されて加熱した場合に充電を停止するため、安全領域外
となるサーミスタ３６の抵抗値をあらかじめ充電器側に
設定しておく。そして、サーミスタ３６の抵抗変化によ
って変動した電圧と基準電圧とを比較することにより、
充電器側の出力を低下または停止させ、保護機能として
動作させている。保護ＩＣ３２の動作としては、充電器
の出力に＋端子３４、−端子３５から充電され、過充電
禁止の動作の場合、何らかの原因で規定値以上の電圧で
充電されたとする。そして、保護ＩＣ３２に設定してい
る過充電禁止電圧に達すると、過充電制御ＦＥＴ４０が
オフとなり、充電を停止する。また、逆に、過放電の状
態になった場合には、過放電制御ＦＥＴ３９がオフとな
り、放電を停止する。しかし、このような保護回路にお
いては、素電池の異常な温度上昇を検知するために充電
器側に温度端子（Ｔ）３７を設けなければならず、その
機能をもたない充電器では、安全な充電をすることがで
きない。また、電池パックが充電器上にない場合、この
温度端子のみによる温度制御効果がないという問題があ
る。FIG. 3 shows a circuit configuration diagram of a battery pack including a conventional protection circuit. This battery pack includes one unit cell. The protection circuit shown in FIG. 3 charges the unit cell 31 via a protection IC 32 for controlling the charge and discharge states of the unit cell 31 (for example, lithium secondary battery) and a protection circuit in the battery pack 33 (see FIG. 3). (Not shown). A temperature terminal (T) 37 connected to the thermistor 36 for controlling a temperature rise during charging, and an identification terminal 38 (S) for distinguishing the battery pack are provided in the battery pack 33. Conventionally, the thermistor 36 changes its resistance value due to temperature fluctuation (for example, 10 KΩ at 25 ° C., 60
(3 kΩ at 0 ° C., 27 kΩ at 0 ° C.), which is used as a temperature detection terminal, and the charger recognizes this resistance value via a temperature terminal (T) 37. In order to stop charging when the unit cell is overcharged and heated during charging, the resistance value of the thermistor 36 outside the safe area is set in advance on the charger side. Then, by comparing the voltage fluctuated by the resistance change of the thermistor 36 with the reference voltage,
The output on the charger side is reduced or stopped, and it operates as a protection function. As an operation of the protection IC 32, it is assumed that the output of the charger is charged from the + terminal 34 and the-terminal 35, and in the case of the operation of prohibiting the overcharge, the protection IC 32 is charged with a voltage higher than a specified value for some reason. When the overcharge prohibition voltage set in the protection IC 32 is reached, the overcharge control FET 40 is turned off, and charging is stopped. On the other hand, when an over-discharge state occurs, the over-discharge control FET 39 is turned off to stop discharging. However, in such a protection circuit, a temperature terminal (T) 37 must be provided on the charger side in order to detect an abnormal temperature rise of the unit cell. Can not be charged. Further, when the battery pack is not on the charger, there is a problem that there is no temperature control effect only by the temperature terminal.
【０００４】また、別の保護回路においては、温度ヒュ
ーズによって異常温度を認識し、温度ヒューズが規定温
度以上になると切れる仕組みになっている（例えば、日
刊工業新聞（株）出版編、電子技術、１９９７年、Ｖｏ
ｌ．３９、Ｎｏ．９、第１〜４５頁を参照。）。しか
し、この場合、温度ヒューズが一旦動作すると、新しい
ものと取り替えないと保護回路そのものが復帰できない
という問題がある。[0004] In another protection circuit, an abnormal temperature is recognized by a thermal fuse and cut off when the thermal fuse exceeds a specified temperature (for example, published by Nikkan Kogyo Shimbun Co., Ltd., Electronic Technology, Vo, 1997
l. 39, no. 9, see pages 1-45. ). However, in this case, once the thermal fuse operates, there is a problem that the protection circuit itself cannot be restored unless it is replaced with a new one.
【０００５】[0005]
【発明が解決しようとする課題】以上の事実に鑑み、本
発明の目的は、上記従来の問題を解決し、素電池の過充
電および過放電などによる加熱を検知して前記過充電お
よび過放電を抑制する機能を有する復帰型の温度制御付
き保護回路を提供することにある。SUMMARY OF THE INVENTION In view of the above facts, an object of the present invention is to solve the above-mentioned conventional problems and to detect overheating and overdischarge of a unit cell to detect the overcharge and overdischarge. It is an object of the present invention to provide a return-type protection circuit with temperature control, which has a function of suppressing the temperature.
【０００６】[0006]
【課題を解決するための手段】本発明は、充放電可能な
二次電池を具備し、本体もしくは充電器に接続される充
放電経路に保護回路を配した電池パックであって、充放
電経路に流れる過電流を検出する過電流検出機能を有す
る制御手段、前記制御手段からの出力信号に応じて前記
充放電経路を開閉する第１のスイッチ手段、前記二次電
池に接するように配されたまたは前記二次電池の近傍に
配された温度非線形素子を含む温度検出手段、および前
記温度検出手段からの出力信号に応じて開閉する第２の
スイッチ手段を含み、前記二次電池の温度が所定の温度
以上に上昇したとき、前記温度検出手段からの信号によ
り第２のスイッチ手段Ｄが閉状態となって前記充放電回
路に過電流が流れ、その過電流を検出した前記制御手段
からの信号により第１のスイッチ手段が開状態となり、
充放電経路を開くことを特徴とする電池パックである。
この電池パックにおいては、前記温度非線形素子はサー
ミスタであるのが好ましい。また、前記温度検出手段
が、常温時における前記温度非線形素子の抵抗と同じ大
きさの抵抗ならびに第１および第２のトランジスタを有
し、前記温度検出手段の出力端が第２のスイッチ手段に
接続されてカレントミラー回路を構成するのが好まし
い。SUMMARY OF THE INVENTION The present invention relates to a battery pack comprising a chargeable / dischargeable secondary battery and a protection circuit arranged in a charge / discharge path connected to a main body or a charger. Control means having an overcurrent detection function of detecting an overcurrent flowing through the first battery, first switch means for opening and closing the charge / discharge path in response to an output signal from the control means, and arranged in contact with the secondary battery. Or a temperature detecting means including a temperature non-linear element disposed near the secondary battery, and a second switch for opening and closing in response to an output signal from the temperature detecting means, wherein the temperature of the secondary battery is a predetermined value. When the temperature rises above the temperature, the second switch means D is closed by a signal from the temperature detection means, and an overcurrent flows through the charge / discharge circuit, and a signal from the control means which detects the overcurrent is output. By Becomes first switch means is in an open state,
A battery pack characterized by opening a charge / discharge path.
In this battery pack, the temperature non-linear element is preferably a thermistor. Further, the temperature detecting means has a resistor having the same magnitude as the resistance of the temperature non-linear element at normal temperature and first and second transistors, and an output terminal of the temperature detecting means is connected to a second switch means. It is preferable that the current mirror circuit be configured in such a manner.
【０００７】[0007]
【発明の実施の形態】本発明の電池パックは、充放電経
路に流れる過電流を検出する過電流検出機能を有する制
御手段、第１のスイッチ手段、温度検出手段、および温
度検出手段からの出力信号に応じて開閉する第２のスイ
ッチ手段を含む。そして、前記二次電池の温度が所定の
温度以上に上昇したとき、前記温度検出手段からの信号
により第２のスイッチ手段が閉状態となって前記充放電
回路に過電流が流れ、その過電流を検出した前記制御手
段からの信号により第１のスイッチ手段が開状態とな
り、前記充放電経路を開くことを特徴とする電池パック
である。DESCRIPTION OF THE PREFERRED EMBODIMENTS A battery pack according to the present invention has a control means having an overcurrent detection function for detecting an overcurrent flowing in a charge / discharge path, a first switch means, a temperature detection means, and an output from the temperature detection means. A second switch means that opens and closes in response to a signal is included. When the temperature of the secondary battery rises above a predetermined temperature, the second switch means is closed by a signal from the temperature detection means, and an overcurrent flows through the charge / discharge circuit, and the overcurrent The battery pack is characterized in that the first switch means is opened by a signal from the control means that has detected the charge, and the charge / discharge path is opened.
【０００８】ここで、本発明の電池パックの一実施例
を、理解の容易のために図面を用いて説明するが、本発
明はこれらのみに限定されるものではない。図１は、本
発明の温度制御付き保護回路を含む電池パックの回路構
成図である。図１に示すように、制御手段２は充放電経
路に流れる過電流を検出する過電流検出機能を有し、第
１のスイッチ手段５に開閉を指示する働きを有する。ま
た、温度検出手段３は、素電池１に接するように配され
た、または素電池１の近傍に配された温度非線形素子
（図示せず。）を含み、所定の温度以上に上昇した素電
池１の温度を検知する。そして、この異常な温度を検出
した温度検出手段３は、第２のスイッチ手段４に信号を
送り、この信号を受けた第２のスイッチ手４は閉状態と
なって充放電回路に過電流を流す。すなわち、本発明の
電池パックは、素電池１の温度が上昇して異常な温度と
なった場合に過電流を流し、その過電流を検出して充放
電経路を開いて過放電および過充電の状態を回避するも
のである。この点、前記従来例のように変動した電圧を
検出する手段だけでなく、二重保護的に温度の制御を取
り入れ、安全性を確保できるという利点がある。Here, an embodiment of the battery pack of the present invention will be described with reference to the drawings for easy understanding, but the present invention is not limited to only these. FIG. 1 is a circuit configuration diagram of a battery pack including a protection circuit with temperature control according to the present invention. As shown in FIG. 1, the control means 2 has an overcurrent detection function of detecting an overcurrent flowing in the charge / discharge path, and has a function of instructing the first switch means 5 to open or close. Further, the temperature detecting means 3 includes a temperature non-linear element (not shown) arranged in contact with the unit cell 1 or arranged in the vicinity of the unit cell 1, and the unit cell whose temperature has risen to a predetermined temperature or higher. 1 is detected. Then, the temperature detecting means 3 which has detected this abnormal temperature sends a signal to the second switch means 4, and the second switch hand 4 receiving this signal closes to apply an overcurrent to the charge / discharge circuit. Shed. That is, when the temperature of the unit cell 1 rises to an abnormal temperature, the battery pack of the present invention supplies an overcurrent, detects the overcurrent, opens a charge / discharge path, and performs overdischarge and overcharge. It avoids the situation. In this respect, there is an advantage that not only means for detecting a fluctuating voltage as in the above-described conventional example but also temperature control is incorporated in a double protection manner to ensure safety.
【０００９】以下に、図２を参照し、本発明の電池パッ
クをさらに具体的に説明する。図２に示す電池パック
は、前記図１に示す電池パックに対して、（１）制御手
段として、過放電電流検出手段、過放電制御手段および
過充電制御手段を含む保護ＩＣ２２を用いる点、（２）
温度検出手段として、前記温度非線形素子と並列に、常
温時における前記温度非線形素子の抵抗と同じ抵抗値の
抵抗ならびに第１および第２のトランジスタを有し、前
記温度検出手段の出力端が第２のスイッチ手段に接続さ
れてなるカレントミラー回路を用いる点、ならびに
（３）第１のスイッチ手段または第２のスイッチ手段が
トランジスタまたは電解効果トランジスタ（ＦＥＴ）か
らなる（なお、図２においては第１のスイッチ手段にＦ
ＥＴを用いている。）点で相違する。Hereinafter, the battery pack of the present invention will be described more specifically with reference to FIG. The battery pack shown in FIG. 2 is different from the battery pack shown in FIG. 1 in that (1) a protection IC 22 including overdischarge current detection means, overdischarge control means, and overcharge control means is used as control means. 2)
The temperature detecting means includes, in parallel with the temperature non-linear element, a resistor having the same resistance value as that of the temperature non-linear element at normal temperature and first and second transistors, and an output terminal of the temperature detecting means is connected to a second terminal. And (3) the first switch means or the second switch means comprises a transistor or a field-effect transistor (FET) (in FIG. 2, the first switch means or the field-effect transistor (FET) is used). Switch means of F
ET is used. ).
【００１０】また、前記（１）と（２）の構成を採る
と、電流を検知することにより二次電池の過度の温度変
化を効率よく制御することができるという利点がある。
さらに、前記（３）の構成を採ると、適当なインピーダ
ンスをもつもの、およびサイズ的な考慮から、最適なデ
バイスを利用することができるという利点がある。な
お、本発明における温度制御付き保護回路はこれらの構
成要素（１）〜（３）をそれぞれ単独で、または任意に
組み合わせて備えていてもよい。In addition, when the above configurations (1) and (2) are employed, there is an advantage that an excessive change in temperature of the secondary battery can be efficiently controlled by detecting a current.
Furthermore, adopting the configuration (3) has an advantage that an optimum device can be used in consideration of a device having an appropriate impedance and a size. The protection circuit with temperature control according to the present invention may include these components (1) to (3) alone or in any combination.
【００１１】ついで、図２に示す保護回路の機能を説明
する。例えば充電器の充電電圧を４．２０Ｖとすると素
電池１には通常４．２０Ｖ以上の電圧は印加されない
が、何らかの異常で素電池１の＋、−間に４．２０Ｖを
超える電圧がかかった場合には、過電圧を検出した保護
ＩＣ２２が、その過充電制御手段により第１のスイッチ
手段の過充電制御用ＦＥＴ４ａを閉じて、過充電状態を
回避する。また、保護ＩＣ２２の過充電禁止電圧の設定
を４．３０Ｖとすると、素電池１の＋、−間に４．３０
Ｖ以上を検出すると、過充電制御が作動し、第１のスイ
ッチ手段の過充電制御用ＦＥＴ４ａが閉じて、過充電状
態を回避する。一方、過放電の状態になった場合には、
例えば保護ＩＣ２２の過放電禁止電圧を３．００Ｖと設
定すると、素電池１の電圧が３．００Ｖ以下になると、
過電圧を検出した保護ＩＣ２２が、その過放電圧制御手
段により第１のスイッチ手段のＦＥＴ４ｂを閉じて、過
放電状態を回避する。また、温度検出手段が二次電池の
過加熱を検知した場合は、サーミスタ３ｃの抵抗値が低
くなり、過充電制御用ＦＥＴ４ａと過放電制御用ＦＥＴ
４ｂとの間、すなわち抵抗４ｃを流れる過電流を検出
し、過放電電流検出手段によりＦＥＴ４ａまたは４ｂを
閉じる。例えば、通信機器およびＡＶ機器の場合は過電
流値を３Ａと設定すればよい。Next, the function of the protection circuit shown in FIG. 2 will be described. For example, assuming that the charging voltage of the charger is 4.20 V, a voltage of 4.20 V or more is not normally applied to the unit cell 1, but a voltage exceeding 4.20 V is applied between + and-of the unit cell 1 due to some abnormality. In this case, the protection IC 22 which has detected the overvoltage closes the overcharge control FET 4a of the first switch means by the overcharge control means to avoid the overcharge state. If the overcharge prohibition voltage of the protection IC 22 is set to 4.30 V, 4.30 V between the + and-of the unit cell 1.
When V or more is detected, the overcharge control is activated, the overcharge control FET 4a of the first switch means is closed, and the overcharge state is avoided. On the other hand, if it is over-discharged,
For example, when the overdischarge prohibition voltage of the protection IC 22 is set to 3.00 V, when the voltage of the unit cell 1 becomes 3.00 V or less,
The protection IC 22 that has detected the overvoltage closes the FET 4b of the first switch means by the overdischarge voltage control means to avoid an overdischarge state. When the temperature detecting means detects overheating of the secondary battery, the resistance value of the thermistor 3c decreases, and the overcharge control FET 4a and the overdischarge control FET 4a.
4b, that is, an overcurrent flowing through the resistor 4c is detected, and the FET 4a or 4b is closed by the overdischarge current detecting means. For example, in the case of a communication device and an AV device, the overcurrent value may be set to 3A.
【００１２】つぎに、図２に示す温度検出手段について
説明する。この温度検出手段は、カレントミラー回路を
有する。この回路においては、保護回路の＋端子および
−端子間に、３個のトランジスタ３ａ、３ｂおよび５ａ
と前記サーミスタ３ｃとを挿入し、＋端子から抵抗３ｄ
を介してトランジスタ３ａを接続し、かつエミッタ接地
し、コレクタの極はトランジスタ３ｂに接続し、トラン
ジスタ３ｂをエミッタ接地する。また、温度非線形素子
サーミスタ３ｃも＋端子に接続し、反対側をトランジス
タ３ｂのコレクタ端子に接続し、トランジスタ３ｃのベ
ースにも接続し、さらにトランジスタ３ｃもエミッタ接
地し、コレクタを＋端子に接続する。Next, the temperature detecting means shown in FIG. 2 will be described. This temperature detecting means has a current mirror circuit. In this circuit, three transistors 3a, 3b and 5a are connected between the + terminal and the-terminal of the protection circuit.
And the thermistor 3c, and insert a resistor 3d from the + terminal.
, The transistor 3a is connected to the emitter and the emitter is grounded, the collector is connected to the transistor 3b, and the transistor 3b is grounded to the emitter. The temperature non-linear element thermistor 3c is also connected to the + terminal, the other side is connected to the collector terminal of the transistor 3b, the base is also connected to the transistor 3c, and the transistor 3c is also grounded to the emitter, and the collector is connected to the + terminal. .
【００１３】このカレントミラー回路に＋端子９と−端
子１０の間に高温状態で過電流が流れる場合を想定して
説明する。抵抗３ｄに流れる電流値をＩ1、サーミスタ
３ｃに流れる電流値をＩ2、トランジスタ５ａのコレク
タ電流値Ｉ3とする。通常、抵抗３ｄとサーミスタ３ｃ
との抵抗値が同じであると、Ｉ1＝Ｉ2である。そのため
に、Ｉ3＝０となり、トランジスタ５ａが閉じる。この
サーミスタ３ｃとして、一般的なＢ定数が３４３５Ｋの
ものを用いると、温度により、例えば２５℃では１０ｋ
Ω、６０℃では３ｋΩ、９０℃では１．２ｋΩ、０℃で
は２７ｋΩと変化し、温度検出端子として利用できる。
そして、このように高温度になると、抵抗値が大きく下
がり、Ｉ1＜Ｉ2となってトランジスタ５ａが開き、Ｉ3
＞０となって充放電経路に過電流が流れる。この抵抗値
が小さく、電流値が大きく流れ、過放電禁止電流までに
なる抵抗値に設定すると、保護ＩＣ２２の過放電電流検
出を動作させ、充放電回路を遮断する。A description will be given on the assumption that an overcurrent flows in the current mirror circuit between the + terminal 9 and the-terminal 10 in a high temperature state. The current flowing through the resistor 3d is defined as I 1 , the current flowing through the thermistor 3c is defined as I 2 , and the collector current I 3 of the transistor 5a is defined as I 3 . Normally, a resistor 3d and a thermistor 3c
If the resistance values are the same, then I 1 = I 2 . Therefore, I 3 = 0, and the transistor 5a is closed. When a thermistor 3c having a general B constant of 3435K is used, for example, at 25 ° C., 10 k
Ω, 3 kΩ at 60 ° C., 1.2 kΩ at 90 ° C., and 27 kΩ at 0 ° C., and can be used as a temperature detection terminal.
When the temperature rises as described above, the resistance value greatly decreases, and I 1 <I 2 , so that the transistor 5a opens, and I 3
> 0, and an overcurrent flows through the charge / discharge path. When the resistance value is small, the current value is large, and the resistance value is set so as to reach the overdischarge prohibition current, the overdischarge current detection of the protection IC 22 is activated, and the charge / discharge circuit is shut off.
【００１４】また、図２の回路では、素電池１とサーミ
スタ３ｃが離れている構成を採るように思われるが、実
際には、素電池１の温度を効率よく検出するために、サ
ーミスタ３ｃのセンサ部を素電池１と接触するように、
またはその近傍に配置するのが好ましい。なお、ここで
は素電池が１個の場合で説明したが、２個以上の直列接
続または並列接続でも同様な使用方法が可能である。ま
た、素電池としてはリチウム二次電池のみを用いたが、
例えばポリマー型のリチウム電池、ニッケル−水素電池
およびニッケル−カドミウム電池などの二次電池に対し
ても、本発明の温度制御付き保護回路を用いることがで
きる。In the circuit of FIG. 2, it seems that the unit cell 1 and the thermistor 3c are separated from each other. However, in order to detect the temperature of the unit cell 1 efficiently, the circuit of the thermistor 3c is actually used. So that the sensor unit contacts the unit cell 1,
Alternatively, it is preferable to dispose it near. Although the description has been given of the case where the number of the unit cells is one, a similar usage method is also possible when two or more cells are connected in series or in parallel. In addition, only a lithium secondary battery was used as a unit cell,
For example, the protection circuit with temperature control of the present invention can be used for a secondary battery such as a polymer lithium battery, a nickel-hydrogen battery, and a nickel-cadmium battery.
【００１５】[0015]
【発明の効果】以上のように、本発明の保護回路構成の
電池パックを充電した場合、素電池そのものが過充電お
よび過放電等で異常な温度になった場合、電流の変化を
検出することにより温度制御可能な復帰型の保護回路を
提供することができる。As described above, when the battery pack having the protection circuit configuration according to the present invention is charged, and when the unit cell itself is at an abnormal temperature due to overcharging, overdischarging, etc., a change in current is detected. Accordingly, it is possible to provide a reset type protection circuit capable of controlling the temperature.
【図１】本発明の温度制御付き保護回路を含む電池パッ
クの回路構成図である。FIG. 1 is a circuit configuration diagram of a battery pack including a protection circuit with temperature control of the present invention.
【図２】本発明の温度制御付き保護回路を含む電池パッ
クのさらに具体的な回路構成図である。FIG. 2 is a more specific circuit configuration diagram of a battery pack including the protection circuit with temperature control of the present invention.
【図３】従来の温度制御付き保護回路を含む電池パック
の回路構成図である。FIG. 3 is a circuit configuration diagram of a conventional battery pack including a protection circuit with temperature control.
１ 素電池 ２ 制御手段 ３ 温度検出手段 ３ａ、３ｂ トランジスタ ３ｃ サーミスタ ３ｄ 抵抗 ４ 第２のスイッチ手段 ４ａ 過充電制御用ＦＥＴ ４ｂ 過放電制御用ＦＥＴ ４ｃ 抵抗 ５ 第１のスイッチ手段 ５ａ トランジスタ ２２ 保護ＩＣ ９ ＋端子 １０ −端子 ３１ 素電池 ３２ 保護ＩＣ ３３ 電池パック ３４ ＋端子 ３５ −端子 ３６ サーミスタ ３７ 温度端子（Ｔ） ３８ 識別端子（Ｓ） ３９ 過放電制御ＦＥＴ ４０ 過充電制御ＦＥＴ ４１ 抵抗 DESCRIPTION OF SYMBOLS 1 Unit cell 2 Control means 3 Temperature detection means 3a, 3b Transistor 3c Thermistor 3d Resistance 4 Second switching means 4a Overcharge control FET 4b Overdischarge control FET 4c Resistance 5 First switching means 5a Transistor 22 Protection IC 9 + Terminal 10-terminal 31 cell 32 protection IC 33 battery pack 34 + terminal 35-terminal 36 thermistor 37 temperature terminal (T) 38 identification terminal (S) 39 overdischarge control FET 40 overcharge control FET 41 resistance
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０２Ｊ 7/00 ３０２ Ｈ０２Ｊ 7/00 ３０２Ｄ 7/10 7/10 Ｌ Ｆターム(参考） 5G003 AA01 BA01 CB01 CC02 DA13 GA01 GA09 5H020 AS06 AS15 DD07 DD13 5H030 AA03 AA04 AS06 AS11 AS18 BB27 FF22 FF42 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (reference) H02J 7/00 302 H02J 7/00 302D 7/10 7/10 LF term (reference) 5G003 AA01 BA01 CB01 CC02 DA13 GA01 GA09 5H020 AS06 AS15 DD07 DD13 5H030 AA03 AA04 AS06 AS11 AS18 BB27 FF22 FF42
Claims (3)
しくは充電器に接続される充放電経路に保護回路を配し
た電池パックであって、充放電経路に流れる過電流を検
出する過電流検出機能を有する制御手段、前記制御手段
からの出力信号に応じて前記充放電経路を開閉する第１
のスイッチ手段、前記二次電池に接するように配された
または前記二次電池の近傍に配された温度非線形素子を
含む温度検出手段、および前記温度検出手段からの出力
信号に応じて開閉する第２のスイッチ手段を含み、前記
二次電池の温度が所定の温度以上に上昇したとき、前記
温度検出手段からの信号により第２のスイッチ手段が閉
状態となって前記充放電回路に過電流が流れ、その過電
流を検出した前記制御手段からの信号により第１のスイ
ッチ手段が開状態となり、充放電経路を開くことを特徴
とする電池パック。1. A battery pack comprising a chargeable / dischargeable secondary battery and a protection circuit disposed in a charge / discharge path connected to a main body or a charger, wherein an overcurrent flowing in the charge / discharge path is detected. Control means having a current detection function, a first means for opening and closing the charge / discharge path in response to an output signal from the control means;
Switch means, a temperature detecting means including a temperature non-linear element disposed in contact with or near the secondary battery, and a switch which opens and closes in response to an output signal from the temperature detecting means. When the temperature of the secondary battery rises to a predetermined temperature or higher, the second switch is closed by a signal from the temperature detector, and an overcurrent is supplied to the charge / discharge circuit. A battery pack characterized in that the first switch means is opened by a signal from the control means which detects the flow and the overcurrent, and the charge / discharge path is opened.
請求項１記載の電池パック。2. The battery pack according to claim 1, wherein said temperature nonlinear element is a thermistor.
子と並列に、常温時における前記温度非線形素子の抵抗
と同じ抵抗値の抵抗ならびに第１および第２のトランジ
スタを有し、前記温度検出手段の出力端が第２のスイッ
チ手段に接続されてカレントミラー回路を構成してなる
請求項１または２記載の電池パック。3. The temperature detecting means includes, in parallel with the temperature non-linear element, a resistor having the same resistance value as that of the temperature non-linear element at normal temperature and first and second transistors. 3. The battery pack according to claim 1, wherein an output terminal of the battery pack is connected to the second switch means to form a current mirror circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP37125398A JP3676935B2 (en) | 1998-12-25 | 1998-12-25 | Battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP37125398A JP3676935B2 (en) | 1998-12-25 | 1998-12-25 | Battery pack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000195560A true JP2000195560A (en) | 2000-07-14 |
| JP3676935B2 JP3676935B2 (en) | 2005-07-27 |
Family
ID=18498395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP37125398A Expired - Fee Related JP3676935B2 (en) | 1998-12-25 | 1998-12-25 | Battery pack |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3676935B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003256083A (en) * | 2002-03-01 | 2003-09-10 | Internatl Business Mach Corp <Ibm> | Electric equipment, computer device, controller, battery switching method and program |
| JP2007141572A (en) * | 2005-11-16 | 2007-06-07 | Matsushita Electric Ind Co Ltd | Battery pack |
| JP2009094037A (en) * | 2007-10-12 | 2009-04-30 | Nec Tokin Corp | Battery pack |
| JP2009193720A (en) * | 2008-02-12 | 2009-08-27 | Mitsumi Electric Co Ltd | Battery pack |
| JP2012016114A (en) * | 2010-06-30 | 2012-01-19 | Hitachi Koki Co Ltd | Battery pack and electric tool using the same |
| WO2014122960A1 (en) * | 2013-02-08 | 2014-08-14 | 日立マクセル株式会社 | Secondary cell pack having protective circuit |
| CN104037466A (en) * | 2013-03-04 | 2014-09-10 | 精工电子有限公司 | Battery device |
| JP2018050469A (en) * | 2017-12-21 | 2018-03-29 | オズマ株式会社 | Charge cable and charger |
| CN108923488A (en) * | 2018-07-23 | 2018-11-30 | 浙江特康电子科技有限公司 | battery charging management system |
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| JPH10223260A (en) * | 1997-02-04 | 1998-08-21 | Mitsumi Electric Co Ltd | Battery unit |
| JPH10270091A (en) * | 1997-03-27 | 1998-10-09 | Rohm Co Ltd | Power monitoring ic and battery pack |
| JPH11206025A (en) * | 1998-01-19 | 1999-07-30 | Matsushita Electric Ind Co Ltd | Battery management device and battery pack using the same |
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1998
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09147922A (en) * | 1995-11-21 | 1997-06-06 | Shindengen Electric Mfg Co Ltd | Charging type battery pack |
| JPH10223260A (en) * | 1997-02-04 | 1998-08-21 | Mitsumi Electric Co Ltd | Battery unit |
| JPH10270091A (en) * | 1997-03-27 | 1998-10-09 | Rohm Co Ltd | Power monitoring ic and battery pack |
| JPH11206025A (en) * | 1998-01-19 | 1999-07-30 | Matsushita Electric Ind Co Ltd | Battery management device and battery pack using the same |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003256083A (en) * | 2002-03-01 | 2003-09-10 | Internatl Business Mach Corp <Ibm> | Electric equipment, computer device, controller, battery switching method and program |
| US7024574B2 (en) | 2002-03-01 | 2006-04-04 | Lenovo (Singapore) Pte Ltd | Method and structure for switching between two battery units for driving an electrically driven device |
| JP2007141572A (en) * | 2005-11-16 | 2007-06-07 | Matsushita Electric Ind Co Ltd | Battery pack |
| JP2009094037A (en) * | 2007-10-12 | 2009-04-30 | Nec Tokin Corp | Battery pack |
| JP2009193720A (en) * | 2008-02-12 | 2009-08-27 | Mitsumi Electric Co Ltd | Battery pack |
| JP2012016114A (en) * | 2010-06-30 | 2012-01-19 | Hitachi Koki Co Ltd | Battery pack and electric tool using the same |
| WO2014122960A1 (en) * | 2013-02-08 | 2014-08-14 | 日立マクセル株式会社 | Secondary cell pack having protective circuit |
| JP2014154345A (en) * | 2013-02-08 | 2014-08-25 | Hitachi Maxell Ltd | Secondary battery pack with protection circuit |
| CN104037466A (en) * | 2013-03-04 | 2014-09-10 | 精工电子有限公司 | Battery device |
| JP2014169933A (en) * | 2013-03-04 | 2014-09-18 | Seiko Instruments Inc | Battery device |
| JP2018050469A (en) * | 2017-12-21 | 2018-03-29 | オズマ株式会社 | Charge cable and charger |
| CN108923488A (en) * | 2018-07-23 | 2018-11-30 | 浙江特康电子科技有限公司 | battery charging management system |
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