JP2008029167A - Electric apparatus - Google Patents

Electric apparatus Download PDF

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JP2008029167A
JP2008029167A JP2006201879A JP2006201879A JP2008029167A JP 2008029167 A JP2008029167 A JP 2008029167A JP 2006201879 A JP2006201879 A JP 2006201879A JP 2006201879 A JP2006201879 A JP 2006201879A JP 2008029167 A JP2008029167 A JP 2008029167A
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main body
battery pack
device body
temperature sensor
temperature
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JP4536040B2 (en
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Masayuki Kobayashi
雅幸 小林
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Sanyo Electric Co Ltd
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    • 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
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    • 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

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Abstract

<P>PROBLEM TO BE SOLVED: To provide electric apparatus which can surely protect a device body, by monitoring the abnormal heating of the device body in a pack battery and interrupting power supply to the device body on the pack battery side, when there is abnormal heating. <P>SOLUTION: The electric apparatus includes the device body, such as a note type PC, and the pack battery which is attached to the device body for supplying power to the device body. A temperature sensor which detects abnormal heating of the device body is incorporated in the device body; and the pack battery is provided with a device body temperature monitoring means, which monitors the output of the temperature sensor and actuates the protective circuit of the pack battery in the abnormal heating of the device body and interrupts the power output from the pack battery. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、機器本体とこの機器本体に装着されるパック電池とを備え、機器本体の異常発熱に起因する不具合をパック電池側で防止するようにした電気機器に関する。   The present invention relates to an electric device that includes a device main body and a battery pack that is attached to the device main body, and prevents defects caused by abnormal heat generation of the device main body on the battery pack side.

携帯電話機やノート型ＰＣ等の電気機器の電源としてパック電池が用いられることが多い。この種のパック電池は、二次電池と該二次電池の異常時等にその充放電を禁止する保護回路、およびその制御回路（制御用ＩＣ）等を備えたものであって上記電気機器の本体に装着して用いられる。またこのようなパック電池が備えた保護回路を利用して、例えば機器本体側からパック電池の制御回路に対して制御信号を与え、これによって二次電池の放電を強制的に禁止制御することも提唱されている（例えば特許文献１を参照）。
特開２０００−３２６８２号公報 In many cases, a battery pack is used as a power source for electric devices such as mobile phones and notebook PCs. This type of battery pack includes a secondary battery, a protection circuit that prohibits charging and discharging when the secondary battery is abnormal, a control circuit (control IC), and the like. Used by attaching to the main body. In addition, by using a protection circuit provided in such a battery pack, for example, a control signal is given to the battery pack control circuit from the device body side, thereby forcibly prohibiting secondary battery discharge. Has been proposed (see, for example, Patent Document 1).
JP 2000-32682 A

しかしながら機器本体側においてシステム異常が生じてその異常発熱を検出できなかったり、或いは通信不良によって機器本体側からパック電池に対して制御信号を与えることができないことが想定される。そしてこのような場合には、パック電池から機器本体に対して電流が供給され続けるので、不測の事態を招く虞があるので、一般的には機器本体自体に温度ヒューズ等の保護素子を組み込んでいるのが実情である。   However, it is assumed that a system abnormality occurs on the apparatus main body side and the abnormal heat generation cannot be detected, or a control signal cannot be given to the battery pack from the apparatus main body side due to communication failure. In such a case, since current is continuously supplied from the battery pack to the device body, there is a risk of unexpected situations. Therefore, a protection element such as a thermal fuse is generally incorporated in the device body itself. The fact is.

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、パック電池おいて機器本体の異常発熱を監視し、異常発熱時にはパック電池側において前記機器本体に対する電力供給自体を遮断することで機器本体を確実に保護することのできる電気機器を提供することにある。   The present invention has been made in consideration of such circumstances, and its purpose is to monitor abnormal heat generation of the device main body in the battery pack, and to cut off the power supply itself to the device main body on the pack battery side when abnormal heat generation occurs. Thus, an object of the present invention is to provide an electrical device that can reliably protect the device body.

上述した目的を達成するべく本発明に係る電気機器は、例えばノート型ＰＣのように機器本体と、この機器本体に装着されて該機器本体に電力を供給するパック電池とを備えたものであって、
前記機器本体に該機器本体の異常発熱を検知する温度センサを組み込むと共に、
前記パック電池には、前記温度センサの出力を監視し、前記機器本体の異常発熱時に該パック電池が備えた保護回路を作動させて該パック電池からの電力出力を遮断する本体温度監視手段を設けたことを特徴としている。 In order to achieve the above-described object, an electrical device according to the present invention includes a device main body, such as a notebook PC, and a battery pack that is attached to the device main body and supplies power to the device main body. And
Incorporating a temperature sensor that detects abnormal heat generation of the device body into the device body,
The battery pack is provided with main body temperature monitoring means for monitoring the output of the temperature sensor and operating a protection circuit provided in the battery pack when the device main body is abnormally heated to cut off the power output from the battery pack. It is characterized by that.

好ましくは前記パック電池は、例えばリチウムイオン電池やニッケル水素電池等の二次電池と、この二次電池の放電路に直列に介挿されて該二次電池の放電を禁止する半導体スイッチやヒューズ等の保護回路と、前記二次電池の放電電流が設定電流閾値を超えたときに前記保護回路を作動させる過電流保護手段と、前記機器本体に組み込まれた温度センサに接続されて該温度センサから求められるセンサ出力に応じて前記保護回路を作動させる本体温度監視手段とを備えて構成される。これらの過電流保護手段や本体温度監視手段は、例えばパック電池に組み込まれた制御用ＩＣが持つ機能として実現される。   Preferably, the battery pack is a secondary battery such as a lithium ion battery or a nickel metal hydride battery, and a semiconductor switch or a fuse that is inserted in series in the discharge path of the secondary battery to prohibit the discharge of the secondary battery. A protection circuit, an overcurrent protection means for activating the protection circuit when a discharge current of the secondary battery exceeds a set current threshold, and a temperature sensor incorporated in the device main body. Main body temperature monitoring means for operating the protection circuit in accordance with the required sensor output. These overcurrent protection means and main body temperature monitoring means are realized as functions of a control IC incorporated in, for example, a battery pack.

また前記温度センサは、例えば固定抵抗を介して前記機器本体の内部基準電圧にプルアップされて前記機器本体の温度に応じて抵抗値が変化するＰＴＣ素子（ポジスタ）やサーミスタ等からなり、上記内部基準電圧を前記固定抵抗との間で分圧した電圧をセンサ出力として前記パック電池に与えるように構成される。   In addition, the temperature sensor includes, for example, a PTC element (posistor) or a thermistor that is pulled up to an internal reference voltage of the device main body via a fixed resistor and whose resistance value changes according to the temperature of the device main body. A voltage obtained by dividing a reference voltage with the fixed resistor is provided to the battery pack as a sensor output.

上記構成の電気機器によれば、機器本体に設けた温度センサを介してパック電池が該機器本体が有する機能とは独立に上記機器本体の温度を監視するので、システム異常等によって機器本体の異常発熱を機器本体側で検出することができないような場合であっても、パック電池側において保護回路を作動させて二次電池からの放電、つまり機器本体への電力供給を遮断するので、機器本体に不測の事態が生じることを効果的に回避することができる。つまりパック電池による機器本体の監視機能により、異常発熱した機器本体に電流が供給され続けることがなくなり、これによって機器本体の動作自体が停止されるので、電子機器としての安全性を十分に高めることができる。   According to the electric device having the above configuration, the battery pack monitors the temperature of the device main body independently of the function of the device main body via the temperature sensor provided in the device main body. Even when heat generation cannot be detected on the device body side, the protection circuit is activated on the battery pack side to shut off the discharge from the secondary battery, that is, the power supply to the device body. It is possible to effectively avoid unexpected situations. In other words, the monitoring function of the device main body using the battery pack prevents current from continuing to be supplied to the device main body that abnormally generates heat, which stops the operation of the device main body itself, thereby sufficiently increasing the safety of the electronic device. Can do.

以下、図面を参照して本発明の一実施形態に係る電気機器について説明する。
図１はこの実施形態に係る電気機器の要部概略構成を示すもので、１０はノート型ＰＣ等の機器本体、２０はこの機器本体１０に装着されて該機器本体１０に電力を供給するパック電池である。機器本体１０は、前記パック電池２０が接続されると共に、図示しないＡＣアダプタ等の外部電源に接続される電源部１１と、この電源部１１を介して電力供給を受けて作動するマイクロプロセッサやメモリ等の負荷１２とを備える。上記電源部１１は、外部電源が接続されている場合には、該外部電源から供給される電力を所定の電圧に変換して負荷１２に供給すると共に、パック電池２０の二次電池２１を充電し、また外部電源が接続されていない場合には、前記パック電池２０の二次電池２１に充電された電力エネルギを前記負荷１２に供給する役割を担う。 Hereinafter, an electric device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic configuration of a main part of an electric device according to this embodiment. Reference numeral 10 denotes a device main body such as a notebook PC, and 20 denotes a pack that is attached to the device main body 10 and supplies power to the device main body 10. It is a battery. The device body 10 is connected to the battery pack 20 and to a power source 11 connected to an external power source such as an AC adapter (not shown), and a microprocessor or memory that operates by receiving power supply via the power source 11. And the like. When the external power supply is connected, the power supply unit 11 converts the power supplied from the external power supply into a predetermined voltage and supplies it to the load 12 and charges the secondary battery 21 of the battery pack 20. In addition, when an external power source is not connected, the power energy charged in the secondary battery 21 of the battery pack 20 is supplied to the load 12.

一方、前記パック電池２０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２１と、この二次電池２１の充放電路に直列に介挿されて該二次電池２１の充電および放電を禁止する保護回路としての半導体スイッチ（ＦＥＴ）２２,２３と、これらの半導体スイッチ（ＦＥＴ）２２,２３を選択的に駆動して前記二次電池２１の充電路または放電路を遮断する制御部（制御用ＩＣ）２４とを備える。この制御部２４は、基本的には二次電池２１のセル電圧（端子電圧）を監視し、セル電圧が満充電状態に達したときに前記半導体スイッチ（ＦＥＴ）２２を駆動して二次電池２１の充電を禁止する機能（過充電保護手段）を備えると共に、二次電池２１の充放電路に直列に介挿されたシャント抵抗２５を介して検出される放電電流が設定電流閾値（過放電電流）に達したとき、前記半導体スイッチ（ＦＥＴ）２３を駆動して二次電池２１の放電を禁止する機能（過電流保護手段）を備える。尚、前記制御部２４に、二次電池２１の温度を監視し、電池温度が異常に高くなったときに前記二次電池２１の充放電を禁止する機能を持たせることもある。   On the other hand, the battery pack 20 is inserted in series with a secondary battery 21 such as a lithium ion battery or a nickel metal hydride battery and a charge / discharge path of the secondary battery 21 to prohibit charging and discharging of the secondary battery 21. Semiconductor switches (FETs) 22 and 23 as protection circuits to be operated, and a controller (control) for selectively driving these semiconductor switches (FETs) 22 and 23 to cut off the charging path or discharging path of the secondary battery 21 IC) 24. The control unit 24 basically monitors the cell voltage (terminal voltage) of the secondary battery 21, and drives the semiconductor switch (FET) 22 when the cell voltage reaches a fully charged state to recharge the secondary battery. A discharge current detected through a shunt resistor 25 inserted in series in the charge / discharge path of the secondary battery 21 is provided as a set current threshold (overdischarge). When the current reaches (current), the semiconductor switch (FET) 23 is driven to inhibit the secondary battery 21 from being discharged (overcurrent protection means). The controller 24 may be provided with a function of monitoring the temperature of the secondary battery 21 and prohibiting charging / discharging of the secondary battery 21 when the battery temperature becomes abnormally high.

基本的には上述した如く構成される機器本体１０とパック電池２０とを備えて構成される電気機器において、この発明が特徴とするところは、前記機器本体１０に該機器本体１０の温度を検出する温度センサ１５を設け、前記パック電池２０の制御部２４において前記機器本体１０が有する機能とは独立に上記温度センサ１５を介して前記機器本体１０の温度を監視し、機器本体１０が異常発熱したときにはパック電池２０側において前述した保護回路（ＦＥＴ２３）を作動させて二次電池２１の放電を禁止する本体温度監視手段を設けた点にある。   Basically, the present invention is characterized in that, in the electric apparatus configured to include the apparatus main body 10 and the battery pack 20 configured as described above, the apparatus main body 10 detects the temperature of the apparatus main body 10. The temperature sensor 15 is provided to monitor the temperature of the device body 10 via the temperature sensor 15 independently of the function of the device body 10 in the control unit 24 of the battery pack 20, and the device body 10 generates abnormal heat. In this case, there is provided a main body temperature monitoring means for operating the protection circuit (FET 23) described above on the side of the battery pack 20 to prohibit the discharge of the secondary battery 21.

即ち、機器本体１０に該機器本体１０の温度に応じて抵抗値が変化するＰＴＣ素子（ポジスタ）を温度センサ１５として組み込む。具体的には固定抵抗１６を介して前記機器本体１０の内部基準電圧ＶrefにプルアップしてＰＣＴ素子（温度センサ）１５を設ける。そして固定抵抗１６とＰＴＣ素子（温度センサ）１５とにより上記内部基準電圧Ｖrefを分圧した電圧Ｖoutをそのセンサ出力としてパック電池２０に与えるように構成される。ちなみに上記ＰＴＣ素子（ポジスタ）１５は、例えば図２に示すようにその温度が或る値を超えたときに急激にその抵抗値Ｒpが増大する温度特性を有する。具体的には、例えば常温（２５℃）において１０ｋΩ程度、１１０℃で１００ｋΩ以下の或る値、そして１３０℃で４.７ＭΩ程度と高抵抗化するような抵抗値温度特性を有する。   That is, a PTC element (posistor) whose resistance value changes according to the temperature of the device body 10 is incorporated in the device body 10 as the temperature sensor 15. Specifically, a PCT element (temperature sensor) 15 is provided by pulling up to the internal reference voltage Vref of the device body 10 via a fixed resistor 16. A voltage Vout obtained by dividing the internal reference voltage Vref by the fixed resistor 16 and the PTC element (temperature sensor) 15 is applied to the battery pack 20 as its sensor output. Incidentally, the PTC element (posistor) 15 has a temperature characteristic that its resistance value Rp increases abruptly when its temperature exceeds a certain value as shown in FIG. Specifically, for example, it has a resistance temperature characteristic such that a certain value of about 10 kΩ at room temperature (25 ° C.), a certain value of 100 kΩ or less at 110 ° C., and about 4.7 MΩ at 130 ° C.

そしてパック電池２０においては、上記ＰＣＴ素子（温度センサ）１５からのセンサ出力を、抵抗２６とツェナーダイオード２７とからなる入力回路を介してクランプして前記制御部２４に取り込み、制御部２４が有する機能として、その入力電圧から機器本体１０の異常発熱の有無を監視する（本体温度監視手段）ように構成される。制御部２４はこの本体温度監視手段により機器本体１０の異常発熱が検出されたとき、前述したＦＥＴ２３を作動させて前記二次電池２１の放電を禁止する。   In the battery pack 20, the sensor output from the PCT element (temperature sensor) 15 is clamped via an input circuit including a resistor 26 and a Zener diode 27, and taken into the control unit 24. As a function, the apparatus main body 10 is configured to monitor the presence or absence of abnormal heat generation from the input voltage (main body temperature monitoring means). When the main body temperature monitoring means detects abnormal heat generation of the device main body 10, the control unit 24 operates the FET 23 described above to prohibit the discharge of the secondary battery 21.

尚、ツェナーダイオード２７は、後述するようにパック電池２０の上述したセンサ出力を検出する為のセンシング端子Ｓと、該パック電池２０の正極端子Ｐとの短絡から制御部（制御用ＩＣ）２４を保護する為のものである。またツェナーダイオード２７に並列接続したコンデンサ１８は、上記センシング端子Ｓに加わる外来ノイズ等を除去する為のフィルタとして機能するものである。   As will be described later, the Zener diode 27 causes the control unit (control IC) 24 to be short-circuited between the sensing terminal S for detecting the sensor output of the battery pack 20 and the positive terminal P of the battery pack 20. It is for protection. The capacitor 18 connected in parallel to the Zener diode 27 functions as a filter for removing external noise and the like applied to the sensing terminal S.

かくしてこのように構成された電気機器によれば、機器本体１０の負荷１２が有する各種の異常監視機能が正常に作動しない場合であっても、パック電池２０の制御部２４は上記負荷１２が有する機能とは独立に機器本体１０の温度を監視しており、機器本体１０の温度が異常発熱により高温化したときには半導体スイッチ（ＦＥＴ）２３を駆動して二次電池２１の放電を禁止するので、機器本体１０への電力供給が遮断される。この結果、機器本体１０の負荷１２に不本意に電流が供給され続けることがなくなり、負荷１２の作動自体が停止されるので該負荷１２が不測の事態に陥ることがなくなる。従って負荷１２を含む機器本体１０のみならず、機器本体１０に装着されたパック電池２０の熱的な安全性を十分に確保することが可能となる。しかも機器本体１０に温度センサ（ＰＴＣ素子）１５を設け、この温度センサ１５の出力をパック電池２０の制御部２４において監視すると言う簡単な構成で電子機器の熱的な安全性を確実に確保することができる。特に前述した特許文献１に紹介されるような機器本体側の異常監視機能とは独立して、パック電池２０側において機器本体１０の異常発熱を監視するので、その安全性を高める上での効果が多大である。   Thus, according to the electric device configured as described above, the control unit 24 of the battery pack 20 has the load 12 even when various abnormality monitoring functions of the load 12 of the device main body 10 do not operate normally. The temperature of the device main body 10 is monitored independently of the function, and when the temperature of the device main body 10 is raised due to abnormal heat generation, the semiconductor switch (FET) 23 is driven and the discharge of the secondary battery 21 is prohibited. The power supply to the device body 10 is cut off. As a result, current is not continuously supplied unintentionally to the load 12 of the apparatus body 10, and the operation of the load 12 is stopped, so that the load 12 does not fall into an unexpected situation. Therefore, it is possible to sufficiently ensure the thermal safety of not only the device main body 10 including the load 12 but also the battery pack 20 attached to the device main body 10. Moreover, the device main body 10 is provided with a temperature sensor (PTC element) 15, and the thermal safety of the electronic device is reliably ensured with a simple configuration in which the output of the temperature sensor 15 is monitored by the control unit 24 of the battery pack 20. be able to. In particular, since the abnormal heat generation of the device main body 10 is monitored on the side of the battery pack 20 independently of the abnormality monitoring function on the device main body side as introduced in Patent Document 1 described above, the effect of improving the safety thereof There is a great deal.

ここで前述したＰＣＴ素子（温度センサ）１５の出力を監視する制御部２４の監視機能について検証する。この種のパック電池２０に組み込まれる制御用ＩＣ２４のセンサ入力端子は、一般的には、例えばその入力電圧が０.８Ｖ以下でセンサ入力が［Ｌ］レベル、また２.０Ｖ以上で［Ｈ］レベルであると判定するように構成される。従って前述した図２に示した如き温度特性を有するＰＴＣ素子１５を温度センサとして用いた場合、固定抵抗１６として２ＭΩのものを用い、この固定抵抗１６を介して機器本体１０の内部基準電圧Ｖrefとして３.３Ｖを印加するものとすれば、機器本体１０の温度が２５℃の場合におけるセンサ出力Ｖoutは、基本的には
Ｖout(25)＝３.３Ｖ×１０ｋΩ／（１０ｋΩ＋２ＭΩ）
＝０.０２Ｖ → ［Ｌ］レベル
となる。 Here, the monitoring function of the control unit 24 that monitors the output of the PCT element (temperature sensor) 15 described above will be verified. The sensor input terminal of the control IC 24 incorporated in this type of battery pack 20 generally has, for example, an input voltage of 0.8 V or less and a sensor input of [L] level, and a voltage of 2.0 V or more and [H]. It is configured to determine that the level. Therefore, when the PTC element 15 having the temperature characteristics as shown in FIG. 2 is used as a temperature sensor, a 2 MΩ resistor is used as the fixed resistor 16, and the internal reference voltage Vref of the device body 10 is passed through the fixed resistor 16. Assuming that 3.3V is applied, the sensor output Vout when the temperature of the device body 10 is 25 ° C. is basically Vout (25) = 3.3V × 10 kΩ / (10 kΩ + 2 MΩ)
= 0.02V → [L] level.

また同様に機器本体１０の温度が１１０℃におけるセンサ出力Ｖoutは
Ｖout(110)＝３.３Ｖ×１００ｋΩ／（１００ｋΩ＋２ＭΩ）
＝０.１６Ｖ → ［Ｌ］レベル
となり、機器本体１０の温度が１３０℃となった場合には、
Ｖout(130)＝３.３Ｖ×４.７ＭΩ／（４.７ＭΩ＋２ＭΩ）
＝２.３１Ｖ → ［Ｈ］レベル
となる。従ってＰＴＣ素子（温度センサ）１５の抵抗値温度特性と、機器本体１０の内部基準電圧Ｖrefとを勘案して上記ＰＴＣ素子（温度センサ）１５をプルアップする固定抵抗１６の抵抗値を決定すれば、制御用ＩＣ２４の信号レベル判定機能（レベル判定特性）をそのまま利用して機器本体１０の異常発熱を確実に検出することができる。 Similarly, the sensor output Vout when the temperature of the device body 10 is 110 ° C. is Vout (110) = 3.3V × 100 kΩ / (100 kΩ + 2 MΩ)
= 0.16V → [L] level, and when the temperature of the device body 10 is 130 ° C,
Vout (130) = 3.3V × 4.7MΩ / (4.7MΩ + 2MΩ)
= 2.31V → [H] level. Accordingly, if the resistance value temperature characteristic of the PTC element (temperature sensor) 15 and the internal reference voltage Vref of the device body 10 are taken into consideration, the resistance value of the fixed resistor 16 that pulls up the PTC element (temperature sensor) 15 is determined. The abnormal heat generation of the device body 10 can be reliably detected by using the signal level determination function (level determination characteristic) of the control IC 24 as it is.

しかし機器本体１０の異常発熱を検出して二次電池２１の放電を禁止する必要があるのは、二次電池２１から機器本体１０に対して電力を供給しているときであり、この場合、素の放電路に介挿されたシャント抵抗２５に起因して機器本体１０側の基準電位（接地電位）とパック電池２０側、つまり制御用ＩＣ２４の基準電位（接地電位）との間に電位差が生じることが否めない。従って実際には、シャント抵抗２５に生じる電位差を考慮してＰＴＣ素子（温度センサ）１５の出力を検出することが必要である。   However, it is necessary to detect the abnormal heat generation of the device body 10 and prohibit the discharge of the secondary battery 21 when power is being supplied from the secondary battery 21 to the device body 10. Due to the shunt resistor 25 inserted in the elementary discharge path, there is a potential difference between the reference potential (ground potential) on the device body 10 side and the reference potential (ground potential) of the battery pack 20, that is, the control IC 24. It can't be denied. Therefore, in practice, it is necessary to detect the output of the PTC element (temperature sensor) 15 in consideration of the potential difference generated in the shunt resistor 25.

ちなみにシャント抵抗２５の抵抗値が５ｍΩであるとすると、パック電池２０の過放電電流制限値以下である１０Ａの電流が流れている場合、シャント抵抗２５には０.０５Ｖの電位差が生じる。従ってこのときに前記制御用ＩＣ２４が検出するセンサ出力は、
Ｖout(25)’＝０.０２Ｖ＋０.０５Ｖ
＝０.０７Ｖ → ［Ｌ］レベル
Ｖout(110)’＝０.１６Ｖ＋０.０５Ｖ
＝０.２１Ｖ → ［Ｌ］レベル
Ｖout(130)’＝２.３１Ｖ＋０.０５Ｖ
＝２.３６Ｖ → ［Ｈ］レベル
となり、上述した１０Ａの放電電流が流れている場合でも、機器本体１０の異常発熱を確実に検出することができる。 Incidentally, if the resistance value of the shunt resistor 25 is 5 mΩ, a potential difference of 0.05 V is generated in the shunt resistor 25 when a current of 10 A that is less than the overdischarge current limit value of the battery pack 20 flows. Therefore, the sensor output detected by the control IC 24 at this time is
Vout (25) '= 0.02V + 0.05V
= 0.07V → [L] level Vout (110) '= 0.16V + 0.05V
= 0.21V → [L] level Vout (130) '= 2.31V + 0.05V
= 2.36 V → [H] level, and even when the above-described discharge current of 10 A flows, abnormal heat generation of the device body 10 can be reliably detected.

また短絡によって１００Ａの過大な電流が流れた場合には、シャント抵抗２５には０.５Ｖの電位差が生じることになり、このとき前記制御用ＩＣ２４は、
Ｖout(25)”＝０.０２Ｖ＋０.５Ｖ
＝０.５２Ｖ → ［Ｌ］レベル
Ｖout(110)”＝０.１６Ｖ＋０.５Ｖ
＝０.６６Ｖ → ［Ｌ］レベル
Ｖout(130)”＝２.３１Ｖ＋０.５Ｖ
＝２.８１Ｖ → ［Ｈ］レベル
のセンサ出力を検出することになり、機器本体１０の異常発熱の監視機能としては正常に働く。しかしこの場合には、シャント抵抗２５を介して検出される過大電流によってパック電池２０が本来的に有する放電禁止の保護機能が働いて二次電池２１の放電が禁止されることになる。 When an excessive current of 100 A flows due to a short circuit, a potential difference of 0.5 V is generated in the shunt resistor 25. At this time, the control IC 24
Vout (25) "= 0.02V + 0.5V
= 0.52V → [L] level Vout (110) "= 0.16V + 0.5V
= 0.66V → [L] level Vout (130) "= 2.31V + 0.5V
= 2.81 V → [H] level sensor output is detected, and the device main body 10 functions normally as a monitoring function for abnormal heat generation. However, in this case, an excessive current detected through the shunt resistor 25 causes a discharge prohibition protection function inherent in the battery pack 20 to inhibit discharge of the secondary battery 21.

尚、二次電池２１の充電時に一時的なラッシュ電流が流れた場合、例えば６０Ａのラッシュ電流が流れた場合には、前述した制御用ＩＣ２４は
Ｖout(25)＋＝０.０２Ｖ＋０.５Ｖ
＝０.５２Ｖ → ［Ｌ］レベル
Ｖout(110)＋＝０.１６Ｖ＋０.５Ｖ
＝０.６６Ｖ → ［Ｌ］レベル
Ｖout(130)＋＝２.３１Ｖ＋０.５Ｖ
＝２.８１Ｖ → ［Ｈ］レベル
なるセンサ出力を検出することになる。従ってこの場合においても、機器本体１０の異常発熱の監視機能は正常に働くことになる。 When a temporary rush current flows when the secondary battery 21 is charged, for example, when a rush current of 60 A flows, the control IC 24 described above has Vout (25) + = 0.02V + 0.5V.
= 0.52V → [L] level Vout (110) + = 0.16V + 0.5V
= 0.66V → [L] level Vout (130) + = 2.31V + 0.5V
= 2.81V → [H] level sensor output is detected. Therefore, even in this case, the abnormal heat generation monitoring function of the device body 10 works normally.

故に、ＰＴＣ素子（温度センサ）１５の抵抗値温度特性と、機器本体１０の内部基準電圧Ｖrefとを勘案して上記ＰＴＣ素子（温度センサ）１５をプルアップする固定抵抗１６の抵抗値を設定しておけば、パック電池２０の使用状態（動作状態）に拘わることなく機器本体１０の異常発熱を確実に検出することができる。尚、上述した異常電流が流れた場合にはパック電池２０の保護機能が働くので、上記電流が流れている時間は数百μ秒程度と短い。従って機器本体１０の異常発熱の監視タイミング（検出タイミング）と重なる虞は低い。しかし更に大きな電流が流れてセンサ出力の電圧領域が反転する可能性を考慮するならば、その検出処理を２回繰り返して行う等して誤検出の可能性を低減することが望ましい。   Therefore, the resistance value of the fixed resistor 16 that pulls up the PTC element (temperature sensor) 15 is set in consideration of the resistance-temperature characteristics of the PTC element (temperature sensor) 15 and the internal reference voltage Vref of the device body 10. Accordingly, the abnormal heat generation of the device main body 10 can be reliably detected regardless of the usage state (operating state) of the battery pack 20. In addition, since the protection function of the battery pack 20 works when the abnormal current described above flows, the time during which the current flows is as short as several hundred microseconds. Therefore, there is a low possibility of overlapping with the monitoring timing (detection timing) of abnormal heat generation of the device body 10. However, in consideration of the possibility that a larger current flows and the voltage range of the sensor output is reversed, it is desirable to reduce the possibility of erroneous detection by repeating the detection process twice.

また前述した実施形態においては制御用ＩＣ２４のセンシング端子にツェナーダイオード２７を設けている。このようなツェナーダイオード２７を設けておけば、上記制御用ＩＣ２４の端子にツェナー電圧Ｖz以上の電圧が加わることがなくなるので、例えばパック電池２０の正極端子Ｐとセンシング端子Ｓとの短絡が生じたとしても、上記制御用ＩＣ２４を破壊するような不具合を招くことがない。具体的には制御用ＩＣ２４の端子に加わる最大許容電圧が６.０Ｖである場合、ツェナーダイオード２７として５.６Ｖのものを用いればセンシング端子Ｓに５.６Ｖ以上の電圧が加わっても、上記制御用ＩＣ２４の端子に加わる電圧を５.６Ｖに制限することができる。またセンシング端子Ｓに加わる電圧が５.６Ｖに満たない場合には、その電圧がそのまま制御用ＩＣ２４に加わることになる。従ってセンシング端子Ｓに加わる過大な電圧から上記制御用ＩＣ２４を効果的に保護することができ、パック電池２０による前述した機器本体１０の異常発熱に対する監視機能を十分に発揮させることができる。   In the embodiment described above, the Zener diode 27 is provided at the sensing terminal of the control IC 24. If such a Zener diode 27 is provided, a voltage equal to or higher than the Zener voltage Vz is not applied to the terminal of the control IC 24. For example, a short circuit between the positive terminal P and the sensing terminal S of the battery pack 20 occurs. However, there is no problem that the control IC 24 is destroyed. Specifically, when the maximum allowable voltage applied to the terminal of the control IC 24 is 6.0 V, if a Zener diode 27 having a voltage of 5.6 V is used, even if a voltage of 5.6 V or more is applied to the sensing terminal S, The voltage applied to the terminal of the control IC 24 can be limited to 5.6V. When the voltage applied to the sensing terminal S is less than 5.6 V, the voltage is applied to the control IC 24 as it is. Therefore, the control IC 24 can be effectively protected from an excessive voltage applied to the sensing terminal S, and the monitoring function for the abnormal heat generation of the device main body 10 by the battery pack 20 can be sufficiently exhibited.

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。ここでは温度センサ１５としてＰＴＣ素子を用いた例について示したが、サーミスタ等の素子を用いることも可能である。またパック電池２０のセンシング端子Ｓに、特許文献１に示されるような機器本体側からの制御信号を受け入れるような機能を設けておくようにしても良い。また保護回路としては二次電池２１の放電路に直列に介挿された温度ヒューズであっても良い。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 embodiment described above. Here, an example in which a PTC element is used as the temperature sensor 15 has been described, but an element such as a thermistor can also be used. Further, the sensing terminal S of the battery pack 20 may be provided with a function for receiving a control signal from the device main body as shown in Patent Document 1. The protection circuit may be a temperature fuse inserted in series in the discharge path of the secondary battery 21. In addition, the present invention can be variously modified and implemented without departing from the scope of the invention.

本発明の一実施形態に係る電気機器の要部概略構成図。The principal part schematic block diagram of the electric equipment which concerns on one Embodiment of this invention. 機器本体に組み込まれる温度センサとしてのＰＴＣ素子の抵抗値温度特性の例を示す図。The figure which shows the example of the resistance value temperature characteristic of the PTC element as a temperature sensor integrated in an apparatus main body.

符号の説明Explanation of symbols

１０ 機器本体
１１ 電源部
１２ 負荷
１５ 温度センサ（ＰＴＣ素子）
１６ 固定抵抗
２０ パック電池
２１ 二次電池
２２ 半導体スイッチ（保護回路；充電禁止用）
２３ 半導体スイッチ（保護回路；放電禁止用）
２４ 制御部（制御用ＩＣ；本体温度監視手段）
２５ シャント抵抗
２７ ツェナーダイオード DESCRIPTION OF SYMBOLS 10 Apparatus main body 11 Power supply part 12 Load 15 Temperature sensor (PTC element)
16 Fixed resistance 20 Pack battery 21 Secondary battery 22 Semiconductor switch (protection circuit; for charge prohibition)
23 Semiconductor switch (protection circuit; for discharge prohibition)
24 control unit (control IC; body temperature monitoring means)
25 Shunt resistor 27 Zener diode

Claims (3)

機器本体と、この機器本体に装着されて該機器本体に電力を供給するパック電池とを備えた電気機器であって、
前記機器本体に該機器本体の異常発熱を検知する温度センサを組み込むと共に、
前記パック電池には、前記温度センサの出力を監視し、前記機器本体の異常発熱時に該パック電池が備えた保護回路を作動させて該パック電池からの電力出力を遮断する本体温度監視手段を設けたことを特徴とする電気機器。 An electrical device comprising a device body and a battery pack attached to the device body and supplying power to the device body,
Incorporating a temperature sensor that detects abnormal heat generation of the device body into the device body,
The battery pack is provided with main body temperature monitoring means for monitoring the output of the temperature sensor and operating a protection circuit provided in the battery pack when the device main body is abnormally heated to cut off the power output from the battery pack. Electrical equipment characterized by that. 前記パック電池は、二次電池と、この二次電池の放電路に介挿されて該二次電池の放電を禁止する保護回路と、前記二次電池の放電電流が設定電流閾値を超えたときに前記保護回路を作動させる過電流保護手段と、前記機器本体に組み込まれた温度センサに接続されて該温度センサから求められるセンサ出力に応じて前記保護回路を作動させる本体温度監視手段とを具備したものである請求項１に記載の電気機器。   The battery pack includes a secondary battery, a protection circuit that is inserted in a discharge path of the secondary battery and prohibits the discharge of the secondary battery, and when the discharge current of the secondary battery exceeds a set current threshold Overcurrent protection means for operating the protection circuit, and main body temperature monitoring means for operating the protection circuit in response to a sensor output required from the temperature sensor connected to a temperature sensor incorporated in the apparatus main body. The electric device according to claim 1, wherein 前記温度センサは、固定抵抗を介して前記機器本体の内部基準電圧にプルアップされて前記機器本体の温度に応じて抵抗値が変化するＰＴＣ素子からなり、上記内部基準電圧を前記固定抵抗との間で分圧した電圧をセンサ出力として前記パック電池に与えるものである請求項１に記載の電気機器。   The temperature sensor includes a PTC element that is pulled up to an internal reference voltage of the device main body through a fixed resistor and changes a resistance value in accordance with the temperature of the device main body. The electric device according to claim 1, wherein a voltage divided between the two is applied to the battery pack as a sensor output.
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