JP2017085684A - Electronic equipment - Google Patents

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JP2017085684A
JP2017085684A JP2015208462A JP2015208462A JP2017085684A JP 2017085684 A JP2017085684 A JP 2017085684A JP 2015208462 A JP2015208462 A JP 2015208462A JP 2015208462 A JP2015208462 A JP 2015208462A JP 2017085684 A JP2017085684 A JP 2017085684A
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battery cell
temperature
voltage
battery
threshold
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悠輝 千島
Yuki Chishima
悠輝 千島
佐藤　洋一
Yoichi Sato
洋一 佐藤
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Canon Inc
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Canon Inc
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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
    • 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

PROBLEM TO BE SOLVED: To maintain battery capacity for a long period from the time of product shipment without increasing power self-consumption in the battery while taking measures against swelling of a battery cell in a high-voltage, high-temperature environment.SOLUTION: Electronic equipment (101) in which a battery pack (201) having a battery cell can be loaded has communication means of receiving temperature information indicative of a temperature of the battery cell from the battery pack, voltage detecting means of detecting the voltage across the battery cell, and control means of controlling operation of the electronic equipment, and actuates the control means in a first load mode when the voltage across the battery cell is equal to or larger than a first voltage threshold and the temperature of the battery cell is equal to or higher than a first temperature threshold to discharge the battery pack with a power consumption of the electronic equipment, and makes the control means end in the first load mode when the voltage across the battery cell is less than the first voltage threshold or the temperature of the battery cell is lower than the first temperature threshold.SELECTED DRAWING: Figure 1

Description

本発明は、充電可能な電池を有する電池パックの放電を制御することができる電子機器に関する。   The present invention relates to an electronic device that can control discharge of a battery pack having a rechargeable battery.

近年の電池パックにおいては、サイクル特性の改善を行うため、高温下におけるセル内のガス発生量が増えており、電池パックが膨れやすくなっている。そこで、さらに電池の保安性を向上させるため、電池が高温下にあるなどの異常状態にある場合、電池パック内の放電回路をオンし、電池を急速に自己放電させる保護回路が提案されている。   In recent battery packs, in order to improve cycle characteristics, the amount of gas generated in the cells at high temperatures is increasing, and the battery packs are likely to swell. Therefore, in order to further improve the safety of the battery, there has been proposed a protection circuit that turns on the discharge circuit in the battery pack and rapidly self-discharges the battery when the battery is in an abnormal state such as a high temperature. .

特許文献１では、圧力センサを用いて電池の内圧を検出した場合、また、温度センサを用いて電池の温度が異常であることを検出した場合に、電池パック内の放電回路をオンし、電池を放電する。   In Patent Document 1, when the internal pressure of a battery is detected using a pressure sensor, or when it is detected that the temperature of the battery is abnormal using a temperature sensor, the discharge circuit in the battery pack is turned on. To discharge.

特開２００２−２３１３１９号公報JP 2002-231319 A

しかしながら、従来の技術では、以下のような問題がある。第１に、電池パック内の放電抵抗に頼る構成では、ガス発生量を対策するためには自己消費電力量を大きくする必要がある。この構成では、正常温度下においても放電を継続するため、すぐに容量がなくなってしまう可能性がある。第２に、放電回路を追加した特許文献１の方法では、高温度下では電池を放電し続けてしまうため、高温度下から脱した場合に電池容量が少なくなりすぎて、電子機器を使用することができないという問題がある。   However, the conventional techniques have the following problems. First, in a configuration that relies on the discharge resistance in the battery pack, it is necessary to increase the amount of self-power consumption in order to reduce the amount of gas generated. In this configuration, since the discharge is continued even under normal temperature, the capacity may be lost immediately. Secondly, in the method of Patent Document 1 in which a discharge circuit is added, since the battery continues to be discharged at a high temperature, the battery capacity becomes too small when the battery is removed from the high temperature, and the electronic device is used. There is a problem that can not be.

上記の課題を解決するために、本発明に係る電子機器は、
電池セルを有する電池パックが装着可能な電子機器であって、前記電池セルの温度を示す温度情報を前記電池パックから受信する通信手段と、前記電池セルの電圧を検出する電圧検出手段と、前記電子機器の動作を制御する制御手段とを有し、前記電池セルの電圧が第１の電圧スレッシュ以上であって、前記電池セルの温度が第１の温度スレッシュ以上である場合は、前記制御手段を第１の負荷モードで起動させ、前記電子機器の消費電力によって前記電池セルを放電させ、前記電池セルの電圧が前記第１の電圧スレッシュ未満であるか、前記電池セルの温度が前記第１の温度スレッシュ未満である場合は、前記制御手段が前記第１の負荷モードで動作することを終了させることを特徴とする。 In order to solve the above problems, an electronic device according to the present invention is
An electronic device to which a battery pack having a battery cell can be attached, the communication means for receiving temperature information indicating the temperature of the battery cell from the battery pack, the voltage detection means for detecting the voltage of the battery cell, Control means for controlling the operation of the electronic device, and when the voltage of the battery cell is equal to or higher than a first voltage threshold and the temperature of the battery cell is equal to or higher than the first temperature threshold, the control means Is activated in the first load mode, the battery cell is discharged by the power consumption of the electronic device, and the voltage of the battery cell is lower than the first voltage threshold, or the temperature of the battery cell is the first When the temperature is lower than the temperature threshold, the control means terminates the operation in the first load mode.

本発明によれば、高電圧及び高温下における電池セルの膨れを対策しながら、電池内の自己消費電力量を増やすことなく、製品出荷時から長期間、電池容量を保持することができる。また、本発明によれば、高温度下から脱出した場合に、電子機器が使用できなくなる事態をできるだけ回避することができる。   According to the present invention, the battery capacity can be maintained for a long period from the time of product shipment without increasing the self-power consumption amount in the battery while taking measures against the swelling of the battery cell under high voltage and high temperature. Further, according to the present invention, it is possible to avoid as much as possible a situation in which the electronic device cannot be used when escaped from a high temperature.

実施形態１における電子機器１０１及び電池パック２０１の構成の一例を説明するためのブロック図である。2 is a block diagram for explaining an example of the configuration of an electronic device 101 and a battery pack 201 in Embodiment 1. FIG. 実施形態１における電子機器１０１の動作の一例を説明するためのフローチャートである。6 is a flowchart for explaining an example of an operation of the electronic apparatus 101 according to the first embodiment. 実施形態１における電子機器１０１の動作の一例を説明するためのフローチャートである。6 is a flowchart for explaining an example of an operation of the electronic apparatus 101 according to the first embodiment. 複数の放電モード間の遷移の一例を説明するための図である。It is a figure for demonstrating an example of the transition between several discharge modes.

以下、図面を参照して本発明の実施形態を説明する。ただし、本発明は以下の実施形態に限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

［実施形態１］
図１は実施形態１における電子機器１０１及び電池パック２０１の構成の一例を説明するためのブロック図である。 [Embodiment 1]
FIG. 1 is a block diagram for explaining an example of the configuration of the electronic device 101 and the battery pack 201 in the first embodiment.

図１において、電池パック２０１内の電池セル２０２は、一つのリチウムイオン電池、または、２つ以上のリチウムイオン電池が直列に接続された組電池である。＋端子３０１、−端子３０２は、電池パック２０１を使用する電子機器１０１に対する電力供給や、充電器により、電池パック２０１への充電を行う端子である。   In FIG. 1, the battery cell 202 in the battery pack 201 is one lithium ion battery or an assembled battery in which two or more lithium ion batteries are connected in series. The + terminal 301 and the − terminal 302 are terminals for supplying power to the electronic device 101 that uses the battery pack 201 and charging the battery pack 201 with a charger.

Ｔ端子３０３は、電池セル２０２の温度情報や電池パック２０１が電子機器１０１に装着されたことを判定するために用いる、電気的な接続端子である。電子機器１０１内の放電制御システム１０３は、制御マイコン１０４が動作を制御する各ブロックの総称である。電源回路１０２は、ＤＣ／ＤＣコンバータを用いたスイッチング電源回路などがこれにあたる。電池パック２０１から供給された電力は、電源回路１０２によって後段負荷の仕様に応じた電圧へ変換される。   The T terminal 303 is an electrical connection terminal used to determine temperature information of the battery cell 202 and that the battery pack 201 is attached to the electronic device 101. The discharge control system 103 in the electronic device 101 is a generic name for each block for which the control microcomputer 104 controls the operation. The power supply circuit 102 corresponds to a switching power supply circuit using a DC / DC converter. The power supplied from the battery pack 201 is converted by the power supply circuit 102 into a voltage according to the specifications of the subsequent load.

通信回路１０５は、電池パック２０１が装着された場合に、温度センサ２０５の温度情報をＴ端子３０３を通じて取得する。制御マイコン１０４は、電池セル２０２の温度情報を得ると同時に、電子機器１０１に電池パック２０１が装着されたことを判定する。電圧検出回路１０６は、一般的なＡＤ変換回路であり、電池パック２０１の電圧値を制御マイコン１０４へ通知する。タイマー１０７は、カウンタ回路であり、電池パック２０１が電子機器１０１に装着されてからカウントを始め、制御マイコン１０４へ通知する。   The communication circuit 105 acquires temperature information of the temperature sensor 205 through the T terminal 303 when the battery pack 201 is attached. The control microcomputer 104 obtains temperature information of the battery cell 202 and determines that the battery pack 201 is attached to the electronic device 101 at the same time. The voltage detection circuit 106 is a general AD conversion circuit, and notifies the control microcomputer 104 of the voltage value of the battery pack 201. The timer 107 is a counter circuit, starts counting after the battery pack 201 is mounted on the electronic device 101, and notifies the control microcomputer 104.

電池パック２０１が放電回路２０３及び電池制御回路２０４を具備している場合、放電回路２０３は、オンオフ可能なスイッチと放電素子とで構成される。例えば、実施形態１では、放電素子にサーミスタなど温度特性を持った素子を用いる。温度の低い場合には抵抗値が高く、温度の高い場合には抵抗値が低くなる素子を選定する。これにより、温度の低い場合には、消費電流が小さいため、電池セル２０２の容量の低下を防ぎ、温度が高い場合には、消費電流が大きいため、電池セル２０２の容量が早く放電され、電池セル２０２の膨れの対策となる。   When the battery pack 201 includes the discharge circuit 203 and the battery control circuit 204, the discharge circuit 203 includes a switch that can be turned on and off and a discharge element. For example, in the first embodiment, an element having temperature characteristics such as a thermistor is used as the discharge element. An element having a high resistance value when the temperature is low and a low resistance value when the temperature is high is selected. Thereby, when the temperature is low, the current consumption is small, so that the capacity of the battery cell 202 is prevented from being reduced. When the temperature is high, the current consumption is large, so the capacity of the battery cell 202 is quickly discharged, and the battery This is a countermeasure against the swelling of the cell 202.

電池パック２０１が電子機器１０１に装着された場合には、通信回路１０５及び電池制御回路２０４は、Ｔ端子３０３を通じて通信を行い、制御マイコン１０４は、電池パック２０１の装着確認を行い、温度センサ２０５の温度情報を得る。   When the battery pack 201 is attached to the electronic device 101, the communication circuit 105 and the battery control circuit 204 communicate through the T terminal 303, and the control microcomputer 104 confirms the attachment of the battery pack 201, and the temperature sensor 205. Temperature information is obtained.

制御マイコン１０４は、電池パック２０１が装着されたことを確認すると、通信回路１０５が電池制御回路２０４へ放電回路２０３のスイッチをオフするよう通知し、放電回路２０３をオフする。これにより、電子機器１０１に装着された場合には、放電回路２０３による消費電流をなくし、電池パック２０１内の温度が放電回路２０３の消費熱量により上昇することを防ぐ。   When the control microcomputer 104 confirms that the battery pack 201 is attached, the communication circuit 105 notifies the battery control circuit 204 to turn off the switch of the discharge circuit 203 and turns off the discharge circuit 203. Thereby, when the electronic device 101 is mounted, current consumption by the discharge circuit 203 is eliminated, and the temperature in the battery pack 201 is prevented from rising due to the heat consumption of the discharge circuit 203.

次に、図２及び図３に示すフローチャートを用いて、実施形態１における電子機器１０１の動作を説明する。   Next, the operation of the electronic apparatus 101 according to the first embodiment will be described using the flowcharts shown in FIGS.

Ｓ１０１で、電池パック２０１が電子機器１０１に装着されると、Ｓ１０２で電池パック２０１の装着確認が行われ、Ｓ１０３で電池パック２０１の放電回路２０３がオフされる。Ｓ１０４において、電子機器１０１の放電判定が行われる。Ｓ１０５において、電池セル２０２の電圧が第１のスレッシュ（第１の閾値）以上か以下か判定し、以上の場合はＳ１０６へ進み、以下の場合はＳ１０８へ進む。   When the battery pack 201 is attached to the electronic device 101 in S101, the attachment confirmation of the battery pack 201 is performed in S102, and the discharge circuit 203 of the battery pack 201 is turned off in S103. In S104, the discharge determination of the electronic device 101 is performed. In S105, it is determined whether or not the voltage of the battery cell 202 is equal to or higher than the first threshold (first threshold). In the case above, the process proceeds to S106, and in the following, the process proceeds to S108.

Ｓ１０６において、電池セル２０２の温度が第１のスレッシュ以上か以下か判定し、以上の場合はＳ１０７へ進み、以下の場合はＳ１０８へ進む。Ｓ１０７において、電子機器１０１は、第１の放電モードにて電池セル２０２を放電する。そして、Ｓ１１１に進み、第１の負荷モードを継続しながら再度、放電判定へ戻る。Ｓ１０５またはＳ１０６からＳ１０８へ進んだ場合、Ｓ１０８において、電池セル２０２の電圧が第２のスレッシュ（第２の閾値）以上か以下か判定し、以上の場合はＳ１０９へ進み、以下の場合はＳ２０１スタンバイへ進む。   In S106, it is determined whether or not the temperature of the battery cell 202 is equal to or higher than the first threshold. In the case above, the process proceeds to S107, and in the following, the process proceeds to S108. In S107, the electronic device 101 discharges the battery cell 202 in the first discharge mode. And it progresses to S111 and returns to discharge determination again, continuing 1st load mode. When the process proceeds from S105 or S106 to S108, in S108, it is determined whether the voltage of the battery cell 202 is equal to or higher than the second threshold (second threshold), and if so, the process proceeds to S109. Proceed to

Ｓ１０９において、電池セル２０２の温度が第２のスレッシュ以上か以下か判定し、以上の場合はＳ１１０へ進み、以下の場合はＳ２０１スタンバイへ進む。Ｓ１１０において、電子機器１０１は、第２の放電モードにて電池セル２０２を放電する。そして、Ｓ１１１に進み、第２の負荷モードを継続しながら再度、放電判定へ戻る。Ｓ２０１スタンバイに入った後の動作を図３によって説明する。   In S109, it is determined whether the temperature of the battery cell 202 is equal to or higher than the second threshold. In the case above, the process proceeds to S110, and in the following, the process proceeds to S201 standby. In S110, the electronic device 101 discharges the battery cell 202 in the second discharge mode. And it progresses to S111 and returns to discharge determination again, continuing 2nd load mode. The operation after entering the S201 standby will be described with reference to FIG.

Ｓ２０１で、電子機器１０１をスタンバイに設定した後、Ｓ２０２にて電池セル２０２が電子機器１０１に装着されてからの時間を参照し、所定時間以上ならＳ２０３に進み、以下の場合はＳ２０６へ進む。Ｓ２０３にて、電池セル２０２の電圧が第３のスレッシュ（第３の閾値）以上か以下か判定し、以上の場合はＳ２０４へ進み、以下の場合はＳ２０６へ進む。Ｓ２０４において、電池セル２０２の温度が第３のスレッシュ以上か以下か判定し、以上の場合はＳ２０５へ進み、以下の場合はＳ２０６へ進む。   After the electronic device 101 is set to standby in S201, the time from when the battery cell 202 is attached to the electronic device 101 is referred to in S202. If the time is equal to or longer than the predetermined time, the process proceeds to S203. In S203, it is determined whether the voltage of the battery cell 202 is equal to or higher than the third threshold (third threshold value). In the case above, the process proceeds to S204, and in the following case, the process proceeds to S206. In S204, it is determined whether the temperature of the battery cell 202 is equal to or higher than the third threshold. If so, the process proceeds to S205, and if the temperature is lower, the process proceeds to S206.

Ｓ２０６において、電子機器１０１は、第３の放電モードにて電池セル２０２を放電する。そして、Ｓ２０６に進み、第２の負荷モードを継続しながら再度、放電判定へ戻る。第３の負荷モードに入らずスタンバイのままＳ２０６へ進んだ場合は、スタンバイのまま再度、放電判定へ戻る。   In S206, the electronic device 101 discharges the battery cell 202 in the third discharge mode. And it progresses to S206 and returns to discharge determination again, continuing 2nd load mode. If the process proceeds to S206 while in standby without entering the third load mode, the process returns to discharge determination again while in standby.

図４は複数の放電モード間の遷移の一例を説明するための図である。ここでは、仮に各スレッシュを、第１の電圧＝８．３Ｖ、第１の温度＝７０℃、第２の電圧＝７．８Ｖ、第２の温度＝６０℃、第３の電圧＝８．２Ｖ、第３の温度＝４０℃としている。   FIG. 4 is a diagram for explaining an example of transition between a plurality of discharge modes. Here, it is assumed that each threshold is set such that the first voltage = 8.3V, the first temperature = 70 ° C., the second voltage = 7.8V, the second temperature = 60 ° C., and the third voltage = 8.2V. Third temperature = 40 ° C.

１０１ 電子機器、１０２ 電源回路、１０３ 放電制御システム、
１０４ 制御マイコン、１０５ 通信回路、１０６ 電圧検出回路、１０７ タイマー、
２０１ 電池パック、２０２ 電池セル、２０５ 温度センサ 101 electronic equipment, 102 power supply circuit, 103 discharge control system,
104 control microcomputer, 105 communication circuit, 106 voltage detection circuit, 107 timer,
201 battery pack, 202 battery cell, 205 temperature sensor

Claims (6)

電池セルを有する電池パックが装着可能な電子機器であって、
前記電池セルの温度を示す温度情報を前記電池パックから受信する通信手段と、
前記電池セルの電圧を検出する電圧検出手段と、
前記電子機器の動作を制御する制御手段と、
を有し、
前記電池セルの電圧が第１の電圧スレッシュ以上であって、前記電池セルの温度が第１の温度スレッシュ以上である場合は、前記制御手段を第１の負荷モードで起動させ、前記電子機器の消費電力によって前記電池セルを放電させ、
前記電池セルの電圧が前記第１の電圧スレッシュ未満であるか、前記電池セルの温度が前記第１の温度スレッシュ未満である場合は、前記制御手段が前記第１の負荷モードで動作することを終了させることを特徴とする電子機器。 An electronic device to which a battery pack having battery cells can be attached,
Communication means for receiving temperature information indicating the temperature of the battery cell from the battery pack;
Voltage detecting means for detecting the voltage of the battery cell;
Control means for controlling the operation of the electronic device;
Have
When the voltage of the battery cell is equal to or higher than the first voltage threshold and the temperature of the battery cell is equal to or higher than the first temperature threshold, the control unit is activated in the first load mode, and the electronic device Discharging the battery cell by power consumption,
When the voltage of the battery cell is lower than the first voltage threshold or the temperature of the battery cell is lower than the first temperature threshold, the control means operates in the first load mode. Electronic equipment characterized by being terminated. 第２の電圧スレッシュ、第２の温度スレッシュ及び第２の負荷モードをさらに有し、
前記電池セルの電圧が前記第１の電圧スレッシュ未満であるか、前記電池セルの温度が前記第１の温度スレッシュ未満である場合に、前記電池セルの電圧が前記第２の電圧スレッシュ以上であって、前記電池セルの温度が前記第２の温度スレッシュ以上である場合は、前記制御手段を前記第２の負荷モードで起動させ、
前記電池セルの電圧が前記第２の電圧スレッシュ未満であるか、前記電池セルの温度が前記第２の温度スレッシュ未満である場合は、前記制御手段が前記第２の負荷モードで動作することを終了させることを特徴とする請求項１に記載の電子機器。 A second voltage threshold, a second temperature threshold, and a second load mode;
When the voltage of the battery cell is less than the first voltage threshold, or when the temperature of the battery cell is less than the first temperature threshold, the voltage of the battery cell is greater than or equal to the second voltage threshold. When the temperature of the battery cell is equal to or higher than the second temperature threshold, the control means is activated in the second load mode,
When the voltage of the battery cell is lower than the second voltage threshold or the temperature of the battery cell is lower than the second temperature threshold, the control means operates in the second load mode. The electronic device according to claim 1, wherein the electronic device is terminated. 前記電池パックが前記電子機器に装着された時間をカウントするタイマーをさらに有し、
前記電池パックが前記電子機器に装着されてから所定の時間が経過した場合に、前記電池セルの電圧が第３の電圧スレッシュ以上である場合は、前記制御手段を第３の負荷モードで起動させ、前記電子機器の消費電力によって前記電池セルを放電させ、
前記電池セルの電圧が前記第１の電圧スレッシュ未満になった場合に、前記制御手段が前記第３の負荷モードで動作することを終了させることを特徴とする請求項１又は請求項２に記載の電子機器。 A timer for counting a time when the battery pack is mounted on the electronic device;
If the battery cell voltage is equal to or higher than a third voltage threshold when a predetermined time has elapsed since the battery pack was attached to the electronic device, the control means is activated in a third load mode. , Discharging the battery cell by the power consumption of the electronic device,
3. The control device according to claim 1, wherein when the voltage of the battery cell becomes lower than the first voltage threshold, the control unit terminates the operation in the third load mode. 4. Electronic equipment. 前記電池セルを放電させるための放電回路をさらに有することを特徴とする請求項１乃至請求項３の何れか一項に記載の電子機器。   The electronic apparatus according to any one of claims 1 to 3, further comprising a discharge circuit for discharging the battery cell. 前記電池パックは、前記電池セルを放電させるための放電回路と、前記放電回路のオンまたはオフを制御する電池制御回路とを有し、
前記電池制御回路は、前記放電回路をオフし、前記放電回路の消費熱量によって前記電池セルの温度が上昇することを防ぐことを特徴とする請求項１乃至請求項３の何れか一項に記載の電子機器。 The battery pack has a discharge circuit for discharging the battery cells, and a battery control circuit for controlling on or off of the discharge circuit,
4. The battery control circuit according to claim 1, wherein the battery control circuit turns off the discharge circuit and prevents the temperature of the battery cell from rising due to the amount of heat consumed by the discharge circuit. 5. Electronic equipment. 前記放電回路は、サーミスタ、または、温度特性を持つ素子を有することを特徴とする請求項５の記載の電子機器。   6. The electronic apparatus according to claim 5, wherein the discharge circuit includes a thermistor or an element having temperature characteristics.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111490567A (en) * 2019-01-28 2020-08-04 青岛海信移动通信技术股份有限公司 Mobile terminal and power supply control method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111490567A (en) * 2019-01-28 2020-08-04 青岛海信移动通信技术股份有限公司 Mobile terminal and power supply control method thereof

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