JP2011205839A - Charger and battery pack - Google Patents

Charger and battery pack Download PDF

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Publication number
JP2011205839A
JP2011205839A JP2010072553A JP2010072553A JP2011205839A JP 2011205839 A JP2011205839 A JP 2011205839A JP 2010072553 A JP2010072553 A JP 2010072553A JP 2010072553 A JP2010072553 A JP 2010072553A JP 2011205839 A JP2011205839 A JP 2011205839A
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JP
Japan
Prior art keywords
charging
battery
charger
battery pack
secondary battery
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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JP2010072553A
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Japanese (ja)
Inventor
Toshiyuki Suzuki
Shinji Watabe
伸二 渡部
利幸 鈴木
Original Assignee
Hitachi Koki Co Ltd
日立工機株式会社
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Publication date
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Priority to JP2010072553A priority Critical patent/JP2011205839A/en
Publication of JP2011205839A publication Critical patent/JP2011205839A/en
Application status is Pending legal-status Critical

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Abstract

PROBLEM TO BE SOLVED: To provide a charger which can charge a battery pack up to a nominal value while preventing the deterioration of a secondary battery.SOLUTION: A charger can charge the battery pack including the secondary battery by at least one charging system, and includes an information part, an acquisition part, and a controller. The informational part notifies the battery pack of the charging system. The acquisition part obtains the charging conditions of the secondary battery corresponding to the charging system from the battery pack following the notification given by the informational part. The controller charges the secondary battery on the basis of the charging conditions.

Description

  The present invention relates to a battery pack and a charger that can appropriately prevent deterioration of a secondary battery.

  Conventionally, when charging a battery pack, the charger reads the resistance value of the identification resistor built in the battery pack to obtain the rated voltage of the battery cell, and the charging current according to the charger-defined protocol corresponding to this rated voltage. In addition, a product that charges a battery pack with a limit value of charging voltage and a termination current value has been known.

  However, in the conventional charger, the battery pack is charged with a uniform charging voltage, charging current, termination current and the like according to the rated voltage of the battery cell. For this reason, if the charging specifications such as the charging voltage and charging current limit value and termination current value of the battery cell do not match the protocol specified by the charger due to differences in manufacturer and model, the battery pack was actually charged. There has been a problem that the capacity is less than the nominal value or the charge / discharge life of the battery pack is shortened.

  In view of such circumstances, the present invention intends to provide a charger and a battery pack that enable charging suitable for the battery characteristics of the battery cells constituting the battery pack.

  The charger according to claim 1 is a charger capable of charging a battery pack having a secondary battery by at least one charging method, the notification unit notifying the battery pack of the charging method, and the notification unit An acquisition unit that acquires the charging condition of the secondary battery according to the charging method from the battery pack according to the notification, and a control unit that charges the secondary battery based on the charging condition. Features.

  With the above configuration, when charging the battery pack, the charger first notifies the battery pack of the charging method. Depending on the acquired charging method, the battery pack takes into account not only the type of secondary battery, rated voltage, and charging capacity, but also the conditions such as manufacturer, model, number of times of charging and discharging the battery pack, The charging conditions such as the charging current limit value and the termination current value are set and notified to the charger. The charger charges the secondary battery based on the charging condition notified from the battery pack. Therefore, the battery pack can be appropriately charged to the nominal capacity, and the secondary battery can be prevented from deteriorating.

  The charger according to claim 2 is a charger capable of charging a battery pack having a secondary battery by at least one charging method, the notification unit notifying the battery pack of the charging method, and the notification unit An acquisition unit that acquires battery characteristics of the secondary battery corresponding to the charging method from the battery pack according to the notification, a setting unit that sets charging conditions for the secondary battery based on the battery characteristics, and And a control unit that charges the secondary battery based on a charging condition.

  With the above configuration, when charging the battery pack, the charger first notifies the battery pack of the charging method. The battery pack is a battery comprising, for example, at least one information such as manufacturer, model, number of times of charging / discharging of the battery pack, the type of the secondary battery, the rated voltage, the charging capacity, etc. according to the acquired charging method. Notify the charger of the characteristics. The charger sets the charging conditions such as the charging voltage and charging current limit values and the termination current value in consideration of the battery characteristics notified from the battery pack, and starts charging the secondary battery based on the charging conditions. To do. Therefore, the battery pack can be appropriately charged to the nominal value, and the secondary battery can be prevented from being deteriorated.

  The battery pack according to claim 3 is a battery pack that is charged by a charger in at least one charging method, a secondary battery, an acquisition unit that acquires information on the charging method, the acquired information, and the A setting unit that sets a charging condition based on battery characteristics of a secondary battery, a notification unit that notifies the charger of the charging condition, and a control unit that controls charging of the secondary battery based on the charging condition It is characterized by having.

  With the above configuration, when the battery pack is charged by the charger, the charging method acquired from the charger and the battery characteristics such as the rated voltage, type, manufacturer, model, charging capacity, and number of times of charging of the secondary battery are displayed. In consideration, the charging voltage and charging current limit values, the termination current value, and the like are set as charging conditions. Then, the charging condition set in this way is notified to the charger, and the battery pack is charged by the charger under this charging condition. Charging conditions such as charging voltage and charging current limit values and termination current values can be set according to the type, manufacturer, or model of the secondary battery, so the battery pack is charged appropriately to the nominal value. At the same time, the secondary battery can be prevented from deteriorating.

  The battery pack according to claim 4 is a battery pack charged by at least one charging method by a charger, and is based on a secondary battery, an acquisition unit that acquires information on the charging method, and the acquired information. And a notification unit that notifies the charger of battery characteristics of the secondary battery, and a control unit that controls charging of the secondary battery that is started after notification by the notification unit.

  With the above configuration, when the battery pack is charged by the charger, for example, the type, the rated voltage, the manufacturer, the model, the charging capacity, and the number of times of charging of the secondary battery correspond to the information about the charging method acquired from the charger. Notify the battery characteristics such as Based on the notified battery characteristics, the charger sets charging conditions such as a charging voltage and charging current limit value, and a termination current value. The secondary battery of the battery pack is charged by the charger under the charging conditions set in this way. Therefore, the battery pack can be appropriately charged to the nominal value, and the deterioration of the secondary battery can be prevented.

  According to the present invention, the battery pack can be charged to the nominal value. In addition, it is possible to prevent the secondary battery of the battery pack from being deteriorated.

It is a block diagram of the charger and battery pack which concern on embodiment of this invention. It is a figure explaining the information memorized by battery side memory or charger side memory. It is a flowchart explaining charge of the battery pack by a charger. It is a figure which shows the example of charge of the battery pack by a charger.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows a battery pack 10 and a charger 20 that charges the battery pack 10.

  The battery pack 10 includes a battery case 11, a battery cell 12, a battery-side microcomputer 13, a battery-side memory 14, and a communication unit 15. The battery cell 12 is composed of a nickel metal hydride battery, a nickel cadmium battery, a lithium ion battery, or the like as a secondary battery, and a plurality of battery cells 12 may be connected in series or in parallel. The battery cell 12 can be charged by the charger 20. The battery-side microcomputer 13 serves as an acquisition unit, a setting unit, and a control unit to monitor the battery voltage and charging current of the battery cell 12 and to control the opening and closing of a current path formed between the battery cell 12 and the charger 20. . The battery-side memory 14 includes battery information including the type, rated voltage, arrangement, manufacturer, or model of the battery cell 12, a plurality of protocols set according to the battery information, and the number of times the battery pack 10 is charged. I remember my history. The battery-side memory 14 stores a plurality of protocols that can be selected according to the charging method of the battery cell 12. The communication unit 15 can communicate bidirectionally with the charger 20 as a notification unit.

  The charger 20 includes a main body 21 including a charger-side microcomputer 22, a charger-side memory 23, and a communication unit 24 that can bidirectionally communicate with the communication unit 15 of the battery pack 10. The charger side microcomputer 22 controls charging of the battery pack 10 connected to the main body 21 as an acquisition unit, a setting unit, and a control unit. The charger-side memory 23 stores at least one charging method information. The stored charging method information includes, for example, three types of fast charging (type A), medium speed charging (type B), and low speed charging (type C) depending on the amount of current that can be supplied from the charger 20 to the battery cell 12. At least one of the charging methods. High-speed charging (type A) is a charging method of a type in which the amount of current flowing through the battery cell 12 is the largest among the three types of charging methods and the time required for full charging is the shortest. Medium-speed charging (type B) is a type of charging method in which the amount of current flowing through the battery cell 12 is the second largest after fast charging, and the time required for full charging is shortest next to fast charging. Low-speed charging (type C) is a charging method of the type that requires the least amount of current to flow through the battery cell 12 and takes the longest time to full charge. The communication unit 24 corresponds to a notification unit.

  Next, details of the information stored in the battery-side memory 14 will be described with reference to FIG. The battery side memory 14 stores an identification code I, a charging condition II for each charging method, and other battery information III. The identification code I is information indicating the type, rated voltage, manufacturer, arrangement, type, and the like of the battery cell 12 such as a nickel metal hydride battery, a nickel cadmium battery, or a lithium ion battery. The charging conditions II for each charging method are the charging conditions used for charging the battery cell 12 for each of the three charging methods: fast charging (type A), medium speed charging (type B), and low speed charging (type C). Is specifically identified. For example, charging voltage and charging current limit value, end current value, charging voltage twice differential value: Δ2V value, charging temperature gradient: -Δt as one protocol, and multiple protocols by charging method as charging conditions It is prepared. The termination current value is a current value when the battery-side microcomputer 13 determines that the battery cell 12 has reached full charge when the value of the current flowing through the battery cell 12 drops to such a value. The Δ2V value and −Δt are also parameters used when determining whether the battery cell 12 is fully charged according to the type of the battery cell 12. The other battery information III is information indicating the battery state such as the history of the charging conditions used for charging the battery pack 10 and the number of times of charging.

  Next, charging of the battery pack 10 by the charger 20 will be described with reference to FIG.

  When the battery pack 10 is connected to the main body 21 of the charger 20, in the charger 20, the charger side microcomputer 21 confirms the connection of the battery pack 10 (S1), and in the battery pack 10, the battery side microcomputer 13 It is confirmed that it is connected to the charger 20 (S11). Next, the charger 20 notifies the battery-side microcomputer 13 that high-speed charging (type A) is performed as a charging method for charging the battery pack 10 (S2). At this time, the battery pack 10 receives from the charger 20 that the charging method information is high-speed charging (S12).

  The battery pack 10 knows that fast charging of the battery cell 12 is started by receiving the charging method information, and updates the battery pack 10 by incrementing the number of times of charging stored in the battery-side memory 14 by one (S13). Next, the battery-side microcomputer 13 takes into account that the charging method is high-speed charging and the number of times of charging stored in the battery-side memory 14, among the plurality of protocols stored in the battery-side memory 14. For example, protocol 1 that is most suitable for the number of times of charging is selected from a plurality of protocols set for use (type A) (S14). Next, the selected protocol 1 (type A) is transmitted to the charger 20 (S15).

  When the charger 20 receives the protocol 1 (type A) from the battery pack 10 (S3), the charger 20 charges the battery pack 10 using the charging voltage and charging current limit values defined in the protocol 1 (type A). Start (S4, S16). In the battery pack 10, the battery-side microcomputer 13 periodically or continuously monitors the battery voltage and charging current of the battery cell 12 being charged so that the battery voltage and charging current do not exceed the respective limit values. Control. Since the charging current of the battery cell 12 decreases as it approaches full charge, when the charging current decreases to the end current value, the battery side microcomputer 13 determines that the battery cell 12 is fully charged and completes charging ( S5, S17).

  Next, in FIG. 4, when charging is performed using the charger 20 by the same charging method, for example, by high-speed charging, the battery cell manufacturer or model is different although the rated voltages of the battery cells 12 are the same. The state of the battery voltage and charging current when charging two types of battery packs 10 is shown. In FIG. 4, the solid line indicates the charging voltage and charging current limit value and the termination current value of the specified protocol provided by the charger 20 according to the rated voltage of the battery cell 12.

When the battery pack 10 includes the battery cell A, the battery-side microcomputer 13 charges the battery cell A with V A as the limit value of the charging voltage, I A as the limit value of the charging current, and the termination current value I AE . Select the protocol to include. Any of the selected charging voltage and charging current limit values and the end current value are smaller than the limit value, end current value, and end current value of the specified protocol. The charger-side microcomputer 22 starts charging using the limit values V A and I A of the charging voltage and charging current, and ends the charging with the termination current value I AE , so that the battery pack 10 including the battery cell A is removed. Fully charged.

On the other hand, when the battery pack 10 is composed of a battery cell B having a different manufacturer or model from the battery cell A, the battery side microcomputer 13 charges the battery cell B with V B as the limit value of the charging voltage. The protocol including I B and the end current value I BE is selected as the limit value. Any of the selected charging voltage and charging current limit values, and the termination current value are larger than the limit value, termination current value, and termination current value of the specified protocol. The charger-side microcomputer 22 starts charging using the charging voltage and charging current limit values V B and I B , and ends charging with the end current I BE , thereby filling the battery pack 10 including the battery cell B. Charge.

  As described above, even if the rated voltage of the battery cell 12 of the battery pack 10 is the same, the battery can be selected by selecting the protocol according to the charging method by the charger 20 and the manufacturer and model of the battery cell 12. The cell 12 can be fully charged under charging conditions such as a charging voltage, a charging current, and a termination current value that are optimal for the battery cell 12. That is, the battery pack 10 can be charged to the nominal capacity.

  Furthermore, in addition to the manufacturer and model of the battery cell 12, the protocol can be selected in consideration of the number of times the battery pack 10 is charged. Therefore, the battery can be charged under the optimum conditions for the actual battery state of the battery pack 10. Can be prevented.

  In the above-described embodiment, a plurality of protocols stored in the battery-side memory 14 of the battery pack 10 according to each charging method may be stored in the charger-side memory 23 of the charger 20. In this case, when the battery pack 10 receives the charging method information in S12, the battery pack 10 updates the number of times of charging in S13, and then replaces the operation in S14 and S15 with the battery cell 12 stored in the battery-side memory 14. The battery information such as type, rated voltage, arrangement, manufacturer, or model and the number of times of charging are transmitted to the charger 20. In addition, as battery information, all the stored information such as the type, rated voltage, arrangement, manufacturer, or model of the battery cell 12 can be transmitted to the charger 20, but the type of battery cell 12, the rated voltage, At least one of the array, manufacturer, model, etc. can also be transmitted to the charger 20.

  On the other hand, the charger 20 stands by in preparation for receiving the battery information and the number of times of charging in S3 instead of the protocol. Then, when the battery information and the number of times of charging are received, the charger side microcomputer 22 considers the charging method, the received battery information and the number of times of charging, and from a plurality of protocols stored in the charger side memory 23, Choose the best protocol. Next, in S4, the charger 20 starts charging the battery pack 10 using the charging conditions specified in the protocol (S4, S16). In the battery pack 10, the battery-side microcomputer 13 regularly or continuously monitors the charging voltage and charging current of the battery cell 12 being charged so that the charging voltage and charging current do not exceed the respective limit values. Control. Since the charging current of the battery cell 12 decreases as it approaches full charge, when the charging current decreases to the end current value, the battery side microcomputer 13 determines that the battery cell 12 is fully charged and completes charging ( S5, S17).

  As described above, in the charger 20, the battery pack 10 is selected by selecting the protocol based on the battery information such as the type, rated voltage, arrangement, manufacturer, or model of the battery cell 12 of the battery pack 10 and the number of times of charging. Although the rated voltage of the battery cell 12 is the same, the battery cell 12 can be fully charged with the optimum charge voltage, charge current, and end current value according to the manufacturer and model of the battery cell 12 and the number of times of charging. Therefore, the battery pack 10 can be charged to the nominal capacity, and deterioration of the battery pack 10 can be prevented.

  When the battery pack 10 is charged by the charger 20 at low speed charging, the amount of charging current flowing through the battery cell 12 is lower than that of high speed charging or medium speed charging. Less likely to occur compared to charging or medium speed charging. Therefore, when the number of times of charging the battery pack 10 by low speed charging is large, the notification of the number of times of charging from the battery pack 10 to the charger 20 may be omitted.

  Further, as other battery information III, the internal resistance of the battery cell 12 or the battery temperature of the battery cell 12 can be used.

  Further, depending on the type of the battery cell 12, among the protocols adopted, depending on the type of the battery cell 12, the battery is charged with a second-order differential value of the charging voltage: Δ2V value or a temperature gradient during charging: −Δt as a charging parameter. The pack 10 can also be charged.

  The present invention can be used for a battery pack including a secondary battery and a charger for charging the battery pack.

DESCRIPTION OF SYMBOLS 10 Battery pack 12 Secondary battery 13 Battery side microcomputer 20 Charger 22 Charger side microcomputer

Claims (4)

  1. A charger capable of charging a battery pack having a secondary battery by at least one charging method,
    A notification unit for notifying the battery pack of the charging method;
    An acquisition unit that acquires a charging condition of the secondary battery according to the charging method from the battery pack according to the notification by the notification unit;
    A control unit for charging the secondary battery based on the charging condition;
    A charger characterized by comprising:
  2. A charger capable of charging a battery pack having a secondary battery by at least one charging method,
    A notification unit for notifying the battery pack of the charging method;
    An acquisition unit for acquiring battery characteristics of the secondary battery corresponding to the charging method from the battery pack according to the notification by the notification unit;
    A setting unit for setting charging conditions of the secondary battery based on the battery characteristics;
    A control unit for charging the secondary battery based on the charging condition;
    A charger characterized by comprising:
  3. A battery pack that is charged by a charger in at least one charging method,
    A secondary battery,
    An acquisition unit for acquiring information on the charging method;
    A setting unit for setting a charging condition based on the acquired information and the battery characteristics of the secondary battery;
    A notification unit for notifying the charger of the charging condition;
    A control unit for controlling charging of the secondary battery based on the charging condition;
    A battery pack comprising:
  4. A battery pack that is charged by a charger in at least one charging method,
    A secondary battery,
    An acquisition unit for acquiring information on the charging method;
    A notification unit for notifying the charger of battery characteristics of the secondary battery based on the acquired information;
    A control unit for controlling charging of the secondary battery started after notification by the notification unit;
    A battery pack comprising:
JP2010072553A 2010-03-26 2010-03-26 Charger and battery pack Pending JP2011205839A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013126325A (en) * 2011-12-15 2013-06-24 Panasonic Eco Solutions Power Tools Co Ltd Charging circuit
JP2018516057A (en) * 2016-02-05 2018-06-14 グァンドン オッポ モバイル テレコミュニケーションズ コーポレーション リミテッド Adapter and charge control method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001327092A (en) * 2000-05-11 2001-11-22 Internatl Business Mach Corp <Ibm> Power supply, charging controller, charging control method, computer, and electric vehicle
JP2004172058A (en) * 2002-11-22 2004-06-17 Matsushita Electric Ind Co Ltd Battery management system and battery pack
JP2008167642A (en) * 2006-12-04 2008-07-17 Matsushita Electric Ind Co Ltd Charging system, charging device, and battery pack

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001327092A (en) * 2000-05-11 2001-11-22 Internatl Business Mach Corp <Ibm> Power supply, charging controller, charging control method, computer, and electric vehicle
JP2004172058A (en) * 2002-11-22 2004-06-17 Matsushita Electric Ind Co Ltd Battery management system and battery pack
JP2008167642A (en) * 2006-12-04 2008-07-17 Matsushita Electric Ind Co Ltd Charging system, charging device, and battery pack

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013126325A (en) * 2011-12-15 2013-06-24 Panasonic Eco Solutions Power Tools Co Ltd Charging circuit
US9142993B2 (en) 2011-12-15 2015-09-22 Panasonic Intellectual Property Management Co., Ltd. Charge circuit, and battery-charger assemblage with the charge circuit
JP2018516057A (en) * 2016-02-05 2018-06-14 グァンドン オッポ モバイル テレコミュニケーションズ コーポレーション リミテッド Adapter and charge control method
US10411494B2 (en) 2016-02-05 2019-09-10 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Adapter and method for charging control

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