WO2016098631A1 - Bloc-batterie, instrument électronique, dispositif d'équilibrage de cellules, procédé d'équilibrage de cellules, et programme - Google Patents

Bloc-batterie, instrument électronique, dispositif d'équilibrage de cellules, procédé d'équilibrage de cellules, et programme Download PDF

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Publication number
WO2016098631A1
WO2016098631A1 PCT/JP2015/084351 JP2015084351W WO2016098631A1 WO 2016098631 A1 WO2016098631 A1 WO 2016098631A1 JP 2015084351 W JP2015084351 W JP 2015084351W WO 2016098631 A1 WO2016098631 A1 WO 2016098631A1
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Prior art keywords
voltage
battery
cell
battery pack
balance
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PCT/JP2015/084351
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English (en)
Japanese (ja)
Inventor
忠大 吉田
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日本電気株式会社
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Priority to JP2016564793A priority Critical patent/JPWO2016098631A1/ja
Publication of WO2016098631A1 publication Critical patent/WO2016098631A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters

Definitions

  • the present invention relates to a battery pack, an electronic device in which the battery pack is mounted, a cell balance device that aligns voltages of a plurality of battery cells included in the battery pack, a cell balance method, and a program.
  • Patent Document 1 when at least one voltage of a plurality of secondary batteries becomes equal to or lower than a discharge end voltage (voltage at which discharge should be terminated), the secondary battery having the lowest voltage among the plurality of secondary batteries.
  • a discharge end voltage voltage at which discharge should be terminated
  • Patent Document 2 listed below discloses a technique for connecting a plurality of secondary batteries to a current bypass circuit when any of the secondary batteries becomes lower than the battery discharge lower limit voltage when discharging the plurality of secondary batteries. ing.
  • the cell balance operation is executed when the secondary battery (lowest voltage cell) having the lowest voltage becomes equal to or lower than the discharge end voltage. Therefore, in a battery pack having a plurality of secondary batteries connected in series, when the condition for performing the balance operation is satisfied, there is a possibility that the battery pack as a whole cannot be discharged due to the lowest voltage cell.
  • the technique of Patent Document 2 when at least one secondary battery becomes equal to or lower than the discharge end voltage, all the secondary batteries are connected to the current bypass circuit and the discharge is terminated. For this reason, the discharge may end in a state where the capacity of the entire battery pack remains.
  • An object of the present invention is to provide a technique capable of improving the utilization efficiency of the capacity of the entire battery pack without stopping the discharge of the battery pack.
  • Control means for operating the balance circuit, A battery pack is provided.
  • Display processing means for calculating the remaining capacity of the battery pack based on the output voltage of the battery pack and displaying the remaining capacity of the battery pack;
  • An electronic device is provided.
  • a balance circuit unit for performing a balance operation for aligning voltages of a plurality of battery cells connected in series; Discharging the plurality of battery cells is a condition relating to the voltage of the lowest voltage cell having the lowest voltage among the plurality of battery cells and indicating that the lowest voltage cell is approaching a timing at which discharge is impossible.
  • a cell balance device having a balance circuit unit that performs a balance operation for aligning the voltages of the plurality of battery cells, Discharging the plurality of battery cells is a condition relating to the voltage of the lowest voltage cell having the lowest voltage among the plurality of battery cells and indicating that the lowest voltage cell is approaching a timing at which discharge is impossible.
  • the balance circuit unit is operated.
  • a cell balance method is provided.
  • a cell balance device having a balance circuit unit for performing a balance operation for aligning the voltages of the plurality of battery cells, Discharging the plurality of battery cells is a condition relating to the voltage of the lowest voltage cell having the lowest voltage among the plurality of battery cells and indicating that the lowest voltage cell is approaching a timing at which discharge is impossible.
  • Control means for operating the balance circuit section when the inside is satisfied A program for functioning as a server is provided.
  • Each component of the battery pack 10 shown in FIG. 1 and the like indicates a functional unit block.
  • the control unit 130 includes a CPU, a memory of an arbitrary computer, a program that realizes the components shown in the figure loaded in the memory, a storage medium such as a hard disk that stores the program, and hardware such as a network connection interface. Realized by any combination of software. There are various modifications of the implementation method and apparatus.
  • FIG. 1 is a block diagram conceptually showing the processing configuration of the battery pack in the first embodiment.
  • the battery pack 10 includes a cell balance device 100 and a battery unit 110.
  • the battery pack 10 includes an internal positive terminal 101, an internal negative terminal 102, an external positive terminal 103, an external negative terminal 104, and a communication terminal 105.
  • the cell balance device 100 includes a balance circuit unit 120, a control unit 130, and a voltage measurement terminal 106.
  • the cell balance device 100 performs a balancing operation for aligning the voltages of the battery cells when a predetermined condition is satisfied when the battery pack 10 is discharged or charged.
  • the internal positive terminal 101 and the internal negative terminal 102 are connected to the positive terminal and the negative terminal of the battery unit 110, respectively.
  • the external positive terminal 103 and the external negative terminal 104 are connected to an electronic device, a charger, or the like (both not shown).
  • the electric power stored in the battery unit 110 is supplied to an electronic device connected via the external positive terminal 103 and the external negative terminal 104.
  • each battery cell of the battery unit 110 is charged by a charger (not shown) connected via the external positive terminal 103 and the external negative terminal 104.
  • the communication terminal 105 is used for communication with an electronic device or a charger that uses the battery pack 10.
  • the communication terminal 105 communicates with an electronic device or a charger that uses the battery pack 10 by using a method such as CAN (Controller Area Network), UART (Universal Asynchronous Receiver Receiver Transmitter), or a contact signal.
  • the voltage measurement terminal 106 is used to measure the voltage of each battery cell of the battery unit 110.
  • the battery unit 110 has a plurality of battery cells connected in series.
  • Each battery cell is a rechargeable secondary battery such as a lithium ion secondary battery or a nickel metal hydride battery.
  • the balance circuit unit 120 includes a balance circuit, a drive circuit for the balance circuit, and a voltage measurement circuit (all not shown), and executes a balance operation for aligning the voltages of the plurality of battery cells.
  • the balance circuit of the balance circuit unit 120 may be a so-called passive balance circuit that discharges from a cell having a high voltage through a resistor, or a so-called active balance circuit that charges a cell having a high voltage to a low cell among a plurality of battery cells. It may be.
  • the balance circuit unit 120 includes a switch element corresponding to each battery cell, and is configured to be able to adjust the voltage of each battery cell by switching ON / OFF of the switch element corresponding to the target battery cell. Yes.
  • the voltage measurement circuit of the balance circuit unit 120 includes an AFE (Analog Front-End) and the like.
  • the AFE measures the voltage of each battery cell included in the battery unit 110 via the voltage measurement terminal 106.
  • the balance circuit unit 120 notifies the control unit 130 of the voltage of each battery cell measured by the AFE.
  • the drive circuit of the balance circuit unit 120 receives a balance operation execution command from the control unit 130, and switches ON / OFF of each switch element of the balance circuit.
  • the control unit 130 When the control unit 130 satisfies the balance operation start condition including the first condition when discharging a plurality of battery cells, the control unit 130 transmits a balance operation execution command to the drive circuit of the balance circuit unit 120. 120 balance circuits are operated.
  • the first condition is a condition related to the voltage of the lowest voltage cell having the lowest voltage among the plurality of battery cells, and is a condition indicating that the timing when the lowest voltage cell becomes undischargeable is approached.
  • the control unit 130 includes an MCU (Micro Control Unit) or the like. The MCU determines whether or not the condition for starting the balance operation is satisfied based on the voltage of each battery cell measured by the AFE of the balance circuit unit 120.
  • MCU Micro Control Unit
  • the MCU instructs the drive circuit of the balance circuit unit 120 to execute the balance operation.
  • the drive circuit of the balance circuit unit 120 executes the switching operation of the balance circuit of the balance circuit unit 120 in accordance with an instruction from the MCU, so that the voltages of the plurality of battery cells can be made uniform.
  • the control unit 130 communicates with an electronic device or a charger that uses the battery pack 10 via the communication terminal 105 to acquire information such as electric power used by the electronic device or a charging current from the charger, and Based on the acquired information, the charge / discharge operation of the battery pack 10 can also be controlled.
  • FIG. 2 is a flowchart showing a process flow of the battery pack 10 according to the first embodiment.
  • the voltage measurement circuit of the balance circuit unit 120 measures the voltage of each battery cell via the voltage measurement terminal 106 (S102). Then, the balance circuit unit 120 notifies the control unit 130 of the voltage of each battery cell measured by the voltage measurement circuit. Then, the control unit 130 compares the voltage of each battery cell measured by the voltage measurement circuit, and the battery cell having the lowest voltage among the plurality of battery cells (lowest voltage cell) and the plurality of battery cells. The battery cell having the highest voltage (highest voltage cell) is identified (S104). Then, the control unit 130 determines whether or not a balance operation start condition including the first condition is satisfied (S106).
  • FIG. 3 is a flowchart illustrating an example of a detailed flow of the process of S106 in the first embodiment.
  • the controller 130 determines whether or not the voltage difference ⁇ V between the highest voltage cell and the lowest voltage cell is equal to or greater than a predetermined threshold value ⁇ V th (S202).
  • the predetermined threshold value ⁇ V th is one of the indexes for determining whether or not the balance operation should be executed, and “the voltage difference ⁇ V is equal to or larger than the predetermined threshold value ⁇ V th ” is one of the conditions for starting the balance operation.
  • the control unit 130 can determine that the voltage does not vary as the balance operation is performed.
  • the determination in S106 is “NO”, and the control unit 130 does not transmit a balance operation execution command to the balance circuit unit 120.
  • the control unit 130 can determine that the voltage between the battery cells varies more than a certain value.
  • the control unit 130 the voltage of the minimum voltage cell further determines whether more than a predetermined reference voltage V B (S204). This "that the voltage of the minimum voltage cell is less than the reference voltage V B" is one of the starting conditions of balance operation (first condition).
  • the reference voltage V B is set as a voltage higher than the discharge end voltage.
  • the reference voltage V B will be described with reference to FIG. Figure 4 is a diagram for explaining a relationship between the reference voltage V B of the discharge characteristics of the battery cell.
  • the voltage of the battery cell tends to decrease sharply near the discharge end voltage. Therefore, by setting the reference voltage V B to the extent that the voltage drops sharply, the accurately detectable timing of minimum battery cell can not be discharged.
  • the reference voltage V B is preferably set as a value obtained by adding 10% to 30% of the difference between the rated charge voltage of the battery cell and the discharge end voltage to the discharge end voltage.
  • FIG. 5 is a diagram illustrating a difference in discharge characteristics due to a difference in negative electrode material.
  • a manganese-based positive electrode material is used.
  • the discharge characteristics when using a graphite-based negative electrode material are steeper than the discharge characteristics when using a hard carbon-based negative electrode material near the end-of-discharge voltage. There is a tendency to go down. Therefore, it can be said that the battery using the graphite-based negative electrode material can more accurately grasp the timing at which discharge becomes impossible.
  • the reference voltage V B is preferably set in accordance with the discharge characteristic to be able to capture that point.
  • the drive unit of the balance circuit unit 120 receives the execution command of the balance operation transmitted from the control unit 130, and controls the balance circuit based on the command.
  • the balance operation is executed (S108).
  • the control unit 130 notifies the balance circuit unit 120 of the battery cell that performs the balancing operation, and the balance circuit unit 120 switches the ON / OFF of the switch element corresponding to the battery cell to make the voltage of each battery cell uniform. .
  • the controller 130 determines whether or not a balance operation end condition is satisfied such that the voltage difference ⁇ V between the highest voltage cell and the lowest voltage cell is equal to or less than a predetermined threshold value ⁇ V th (S110).
  • S110: NO the balance operation is continued, and when the balance operation end condition is satisfied (S110: YES)
  • the processing of the present embodiment is ended.
  • the voltages of the battery cells included in the battery unit 110 are aligned at least in the vicinity of the discharge end voltage. That is, in the battery pack 10, it is suppressed that a certain battery cell reaches the end-of-discharge voltage before other battery cells due to the variation of each battery cell, and the battery pack 10 as a whole cannot be used. Thereby, each battery cell can be discharged to near discharge end voltage. As a result, according to the present embodiment, it is possible to improve the utilization efficiency of the capacity stored as the entire battery pack 10 without stopping the discharge.
  • FIG. 6 is a flowchart illustrating another example of the detailed flow of the process of S106 in the modification of the first embodiment.
  • the controller 130 determines whether or not the voltage difference ⁇ V between the highest voltage cell and the lowest voltage cell is greater than or equal to a predetermined threshold value ⁇ V th (S302).
  • the predetermined threshold value ⁇ V th is one of the indexes for determining whether or not the balance operation should be executed, and “the voltage difference ⁇ V is equal to or larger than the predetermined threshold value ⁇ V th ” is one of the conditions for starting the balance operation.
  • the control unit 130 can determine that the voltage does not vary as the balance operation is performed.
  • the determination in S106 is “NO”, and the control unit 130 does not transmit a balance operation execution command to the balance circuit unit 120.
  • the control unit 130 can determine that the voltage between the battery cells varies more than a certain value.
  • the control unit 130 calculates a differential value of the voltage difference ⁇ V (S304), and determines whether or not the differential value of the voltage difference ⁇ V is equal to or greater than a predetermined threshold T (S306).
  • This “the differential value of the voltage difference ⁇ V is equal to or greater than a predetermined threshold T” is one of the balancing operation start conditions (first condition).
  • FIG. 7 is a diagram for explaining the first condition in the modification of the first embodiment.
  • the capacity of a battery cell having a higher degree of deterioration that is, the lowest voltage cell
  • the spread of the voltage difference ⁇ V increases. That is, by confirming the differential value of the voltage difference ⁇ V, it is possible to detect the timing at which the lowest battery cell cannot be discharged.
  • the battery pack 10 of this embodiment has the same configuration as that of the first embodiment.
  • FIG. 12 is a sequence diagram illustrating an example of a flow of a charging process for the battery pack 10 according to the second embodiment.
  • FIG. 13 is a sequence diagram illustrating another example of the flow of the charging process for the battery pack 10 according to the second embodiment.
  • the battery pack 10 and the charger 30 corresponding to the battery pack 10 are connected, and for example, the charging process of the battery pack 10 is started with a predetermined charging current I c (for example, a rated charging current) (S502).
  • the charger 30 may be built in the battery pack 10 and configured to start charging by being connected to the system via a power cable or the like.
  • the voltage measurement circuit of the balance circuit unit 120 measures the voltage of each battery cell via the voltage measurement terminal 106 (S504). Then, the balance circuit unit 120 notifies the control unit 130 of the voltage of each battery cell measured by the voltage measurement circuit. Then, the control unit 130 compares the voltage of each battery cell measured by the voltage measurement circuit, and identifies the highest voltage cell among the plurality of battery cells (S506). Then, the control unit 130 transmits information such as the voltage of the identified highest voltage cell to the charger 30 via the communication terminal 105 (S508).
  • the charger 30 Upon receiving the voltage of the highest voltage cell, the charger 30 determines whether or not the voltage V of the highest voltage cell is equal to or higher than a predetermined charging voltage (for example, the rated charging voltage V 1 ) (S510). If the voltage of the highest voltage cell is less than the rated charge voltage V 1 (S510: NO), the charger 30 as to continue charging. In this case, the process returns to S504, and the processes from S504 are repeated. On the other hand, when the voltage of the highest voltage cell is rated charge voltages V 1 or more (S510: YES), the charger 30 lowers the charging current I c (S512). Of decrease of the charging current I c, for example, it is previously set to the charger 30. Also, of decrease of the charging current I c may be is set so as to reduce seamlessly, it may be set so as to reduce stepwise.
  • a predetermined charging voltage for example, the rated charging voltage V 1
  • the charger 30 determines whether or not the voltage V of the highest voltage cell is equal to or higher than
  • the charger 30, the current of the charging current is determined whether a predetermined charging end current I 0 or less (S514). If the current value exceeds the charging end current I 0 (S514: NO), the charger 30 as to continue charging. In this case, the process returns to S504, and the processes from S504 are repeated. On the other hand, if the charging current follows the charge termination current I 0 (S514: YES), the charger 30 ends the charging process (S516).
  • the battery pack 10 is configured to control the charging current by transmitting a control signal to the charger via the communication terminal 105.
  • the control unit 130 notifies the charger 30 of the initial value of the charging current I c via the communication terminal 105.
  • the initial value of the charging current I c for example may be previously set in the control section 130 as a fixed value such as a rated charging current, be dynamically determined by the control unit 130 according to the state of the battery unit 110 Good.
  • the charger 30 starts the charging process for the battery pack 10 based on the initial value of the charging current I c transmitted from the battery pack 10 (S604).
  • the charger 30 may be built in the battery pack 10 and configured to start charging by being connected to the system via a power cable or the like.
  • the voltage measurement circuit of the balance circuit unit 120 measures the voltage of each battery cell via the voltage measurement terminal 106 (S606). Then, the balance circuit unit 120 notifies the control unit 130 of the voltage of each battery cell measured by the voltage measurement circuit. Then, the control unit 130 compares the voltage of each battery cell measured by the voltage measurement circuit, and identifies the highest voltage cell among the plurality of battery cells (S608).
  • the controller 130 determines whether or not the voltage of the highest voltage cell is equal to or higher than a predetermined charging voltage (for example, the rated charging voltage V 1 ) (S610). If the voltage of the highest voltage cell is less than the rated charge voltage V 1 (S610: NO), the charging process is continued as it. In this case, the process returns to S606, and the processes from S606 are repeated. On the other hand, when the voltage of the highest voltage cell is rated charge voltages V 1 or more (S610: YES), the control unit 130 sends a request to lower the charging current I c with respect to the charger 30 (S612). Then, in response to a request S612, charger 30 lowers the charging current I c (S614).
  • a predetermined charging voltage for example, the rated charging voltage V 1
  • decrease of the charging current I c may be, for example, set in advance in the charger 30, it may be included in the instruction of the control section 130. Also, of decrease of the charging current I c may be is set so as to reduce seamlessly, it may be set so as to reduce stepwise.
  • the control unit 130 determines whether or not a charging end condition is satisfied that the voltage of the highest voltage cell is equal to or higher than the rated charging voltage V 1 and the charging current is equal to or lower than the charging end current I 0 (S616). In other words, the control unit 130 determines whether or not the voltage of the highest voltage cell no longer falls below the rated charging voltage V 1 even when the charging current I c is reduced to the charging end current I 0 (that is, the battery pack 10 is sufficiently charged). Whether or not the battery has been charged. If the charge termination condition is not satisfied (S616: NO), the process returns to S606, and the processes from S606 are repeated.
  • the control unit 130 transmits a charging termination request to the charger 30 via the communication terminal 105 (S618).
  • the charger 30 ends the charging process (S620).
  • the control unit 130 when the voltage of the highest voltage cell has reached the rated charge voltage V 1, charging a request to lower the charging current I c to the charging end current I 0 You may transmit to the device 30.
  • the control unit 130 determines the voltage of the maximum voltage cell is only whether reaches the rated charging voltage V 1.
  • the control unit 130 transmits a charging stop request to the charger 30, charging is terminated.
  • the control can be realized by a contact signal of about 2 bits, and the effect of simplifying the control can be expected.
  • the maximum voltage cell it is determined whether or not the maximum voltage cell has reached a predetermined charging voltage (for example, rated charging voltage) on the charger 30 side. Reduced. Further, in another example of the present embodiment, when the maximum voltage cell reaches a predetermined charging voltage (for example, a rated charging voltage), an instruction to reduce the charging current is transmitted from the control unit 130 to the charger 30. The charging current output from the charger 30 is reduced. Thus, according to the present embodiment, it is possible to continue charging while preventing the voltage of the battery cell having a high degree of deterioration from exceeding the rated charge voltage and becoming overcharged, and sufficiently charge the battery pack 10. it can.
  • a predetermined charging voltage for example, rated charging voltage
  • FIG. 10 is a diagram illustrating a change in voltage of the battery pack 10 when the operation of the second embodiment is performed.
  • FIG. 11 is a diagram illustrating a change in voltage of the battery pack 10 when the operation of the second embodiment is not performed.
  • the battery cell having a higher degree of deterioration reaches the rated charge voltage sooner. Therefore, if charging is continued without taking any countermeasures, the battery cell having a high degree of deterioration is overcharged as shown in FIG. 11, and the voltage reaches the charge stop voltage, so that the battery pack 10 as a whole is not fully charged. Will stop charging. Moreover, the battery is quickly deteriorated due to the overcharge state.
  • the battery cell when a battery cell having a high degree of deterioration reaches a rated charge voltage, the battery cell is switched to so-called CV (Constant Voltage) charging, while preventing a battery cell having a high degree of deterioration from being overcharged. , Can continue charging. That is, according to the present embodiment, the battery pack 10 can be sufficiently charged without worrying about overcharging of each battery cell.
  • CV Constant Voltage
  • FIG. 8 is a block diagram conceptually showing the processing configuration of the battery pack in the modification of the second embodiment.
  • the battery pack 10 of the present modification further includes a current interrupting unit 140 in addition to the configuration of the first embodiment.
  • the current interrupting unit 140 adjusts the charging power supplied from the charger in accordance with an instruction from the control unit 130.
  • the current interrupting unit 140 is configured using, for example, a MOS-FET (Metal / Oxide / Semiconductor / Field / Effect / Transistor).
  • the control unit 130 switches and controls the ON / OFF state of the MOS-FET when the voltage of the highest voltage cell becomes equal to or higher than a predetermined charging voltage (for example, a rated charging voltage), and controls the current blocking unit 140 per unit time.
  • a predetermined charging voltage for example, a rated charging voltage
  • the so-called pulse charging is executed according to the ON / OFF ratio.
  • the current interrupting unit 140 is disposed on the positive electrode terminal side, but may be disposed on the negative electrode side.
  • FIG. 9 is a sequence diagram showing the flow of the battery pack charging process in the modification of the second embodiment.
  • the control unit 130 notifies the charger 30 of the initial value of the charging current I c via the communication terminal 105.
  • the initial value of the charging current I c for example may be previously set in the control section 130 as a fixed value such as a rated charging current, be dynamically determined by the control unit 130 according to the state of the battery unit 110 Good.
  • the voltage measurement circuit of the balance circuit unit 120 measures the voltage of each battery cell via the voltage measurement terminal 106 (S406). Then, the balance circuit unit 120 notifies the control unit 130 of the voltage of each battery cell measured by the voltage measurement circuit. Then, the control unit 130 compares the voltage of each battery cell measured by the voltage measurement circuit, and identifies the battery cell (highest voltage cell) having the highest voltage among the plurality of battery cells (S408).
  • the controller 130 determines whether or not the voltage of the highest voltage cell is equal to or higher than a predetermined charging voltage (for example, the rated charging voltage V 1 ) (S410). If the voltage of the highest voltage cell is less than the rated charge voltage V 1 (S410: NO), the control unit 130 does not perform the processing described below, the charging process is continued as it. In this case, the process returns to S406, and the processes from S406 are repeated. On the other hand, when the voltage of the highest voltage cell is rated charge voltages V 1 or more (S410: YES), the control unit 130 controls the ON / OFF ratio of the current blocking portion 140 per unit time, start pulse charging (S412). As the pulse charging, any method including a known one can be applied.
  • a predetermined charging voltage for example, the rated charging voltage V 1
  • the control unit 130 stops the charging and OFF a current blocking portion 140. Controller 130, the voltage of the highest voltage cell is reduced by the stop of the charging, it is lower than the rated charging voltage V 1, when it is detected that falls below a predetermined set voltage, the charging and ON current interruption unit 140 again You may resume. In this case, by the charging is resumed, the voltage of the highest voltage cell increases again to reach the rated charge voltage V 1. Thereafter, the pulse charging by the repetition is continued, but the duty ratio at which the pulse charging is turned on gradually decreases as the charging progresses. In addition, since the cell which becomes the highest voltage during pulse charging may be switched, the control unit 130 acquires the measured voltage of each battery cell as needed and identifies the highest voltage cell (corresponding to S406 and S408). May be implemented.
  • the control unit 130 determines whether or not a charging termination condition is satisfied that the duty ratio of the pulse charging is equal to or less than a predetermined threshold D th (for example, 5 to 10%, etc.) (S414).
  • a predetermined threshold D th for example, 5 to 10%, etc.
  • the control unit 130 transmits a charging termination request to the charger 30 via the communication terminal 105 (S416). In response to the charging end request in S416, the charger 30 ends the charging process (S418).
  • FIG. 14 is a block diagram conceptually showing the processing configuration of the battery pack in the third embodiment.
  • the battery pack 10 of this embodiment further includes a voltage conversion unit 150 in addition to the configuration shown in FIG. 8.
  • the plurality of battery cells included in the battery unit 110 are first type secondary batteries, and the battery pack 10 uses a second type secondary battery different from the first type. Connected to an electronic device (not shown).
  • the voltage conversion unit 150 uses a relational expression between the voltage and the remaining capacity in the first type secondary battery (hereinafter also referred to as a first relational expression) as a relational expression between the voltage and the remaining capacity in the second type secondary battery.
  • the voltage of a plurality of battery cells is converted using a conversion condition for conversion into (hereinafter also referred to as a second relational expression).
  • the voltage converter 150 includes, for example, a non-insulated DC (Direct-Current) -DC converter such as a chopper method, an insulated DC-DC converter using a switching transformer, and the like as means for converting voltage. .
  • a non-insulated DC (Direct-Current) -DC converter such as a chopper method
  • an insulated DC-DC converter using a switching transformer and the like as means for converting voltage.
  • the voltage conversion unit 150 includes a calculation unit such as a CPU (Central Processing Unit) and can control its own operation. It may be configured.
  • the control unit 130 uses, for example, information as shown in FIG. 15 as the conversion condition described above.
  • FIG. 15 is a diagram illustrating an example of the conversion condition.
  • the conversion information shown in FIG. 15 is, for example, based on the first relational expression and the second relational expression, after grasping the relationship between the voltage and the remaining capacity of each type of secondary battery, It can be generated by combining the corresponding voltages.
  • the conversion conditions shown in FIG. 15 are defined with respect to the voltage of the entire battery pack, for example, and stored in a storage unit (not shown).
  • the control unit 130 reads the conversion condition with reference to the storage unit. Then, the control unit 130 transmits an operation command for converting the total voltage of the battery unit 110 into a voltage converted using the conversion condition, to the voltage conversion unit 150. Note that the conversion information is not limited to the example of FIG.
  • FIG. 16 is a flowchart showing a process flow of the battery pack 10 according to the third embodiment.
  • the control unit 130 acquires the total voltage of the battery unit 110 via the voltage measurement terminal 106 (S702). And the control part 130 converts the acquired total voltage of the battery part 110 into the voltage of a 2nd kind of secondary battery using the conversion information as shown, for example in FIG. 15 (S704). And the control part 130 transmits the operation command which converts the total voltage of the battery part 110 into the voltage derived
  • the voltage conversion unit 150 converts the total voltage of the battery unit 110 according to the operation command, and outputs the total voltage to the electronic device connected via the external positive terminal 103 and the external negative terminal 104 (S708).
  • the battery unit 110 is configured by the first type secondary battery, and the total voltage of the battery unit 110 is converted into the voltage of the second type secondary battery according to the conversion condition. Is output.
  • an electronic device or the like that operates using a secondary battery of a different type from the secondary battery included in the battery pack 10 can be normally operated using the battery pack 10.
  • first type secondary battery is a lithium ion secondary battery
  • second type secondary battery is a lead acid battery.
  • lead-acid batteries contain “lead” which is an environmental impact substance (lead is restricted in each country in the RoHS (Restriction of Hazardous Substances) Directive) and uses “sulfuric acid” as an electrolyte. Therefore, it can be said that the lead storage battery has a large environmental load.
  • a lithium ion secondary battery having a smaller environmental load than a lead storage battery can be used in an electronic device for the lead storage battery, and as a result, an environmental conservation effect can be expected.
  • the lead storage battery may be used as a battery for driving an electronic device of a vehicle such as a motorcycle, for example. In such a vehicle, the total weight affects the fuel consumption and the magnitude of accident damage.
  • an energy density higher than a lead acid battery and a lightweight lithium ion secondary battery can be used with the electronic device for lead acid batteries. As a result, it is possible to reduce the weight of the vehicle on which the electronic device is mounted, improve fuel efficiency, and reduce damage during an accident.
  • FIG. 17 is a block diagram conceptually showing the processing configuration of the electronic apparatus in the fourth embodiment.
  • the electronic device 20 of the present embodiment includes a display processing unit 210 and a display unit 220.
  • the battery pack 10 described in each of the above-described embodiments is mounted on or connected to the electronic device 20 using a cable or the like.
  • the electronic device 20 uses the remaining voltage of the battery pack 10 based on the output voltage of the battery pack 10 as a user. Notify
  • the display processing unit 210 calculates the remaining capacity of the battery pack 10 based on the output voltage of the battery pack 10 and displays the remaining capacity of the battery pack 10 on the display unit 220.
  • the display processing unit 210 converts the output voltage of the battery pack 10 into the remaining capacity using, for example, a table as shown in FIG.
  • FIG. 18 is a diagram illustrating an example of information defining the relationship between the output voltage of the battery pack 10 and the remaining capacity.
  • the table defining the relationship between the output voltage and the remaining capacity is determined according to the type of battery mounted on the electronic device 20.
  • the display processing unit 210 is not limited to this, and may have a function for converting the voltage value into the remaining capacity in advance, for example, and may convert the output voltage of the battery pack 10 into the remaining capacity using the function. .
  • the display processing unit 210 generates drawing data to be displayed on the display unit 220 such as a liquid crystal display based on the output voltage conversion result, and outputs the drawing data to the display unit 220.
  • the display unit 220 is a circuit that displays a remaining capacity using a light emitting element such as an LED (Light Emitting Diode), and the display processing unit 210 is a circuit that is configured to cause the light emitting element corresponding to the remaining capacity to emit light. May be.
  • FIG. 19 is a flowchart illustrating a processing flow of the electronic device 20 according to the fourth embodiment.
  • the electronic device 20 determines whether or not the power is on (S802).
  • the display processing unit 210 acquires the output voltage of the battery pack 10 from the battery pack 10 (S804).
  • the display processing unit 210 may acquire the output voltage of the battery pack 10 from the control unit 130 via the communication terminal 105, or measure the inter-terminal voltage between the external positive terminal 103 and the external negative terminal 104. Then, the output voltage of the battery pack 10 may be acquired. Then, the display processing unit 210 converts the output voltage of the battery pack 10 acquired in S804 into the remaining capacity of the battery pack 10 (S806), and displays it on the display unit 220 (S808).
  • the display processing unit 210 converts the output voltage of the battery pack 10 acquired in S804 into the remaining capacity of the battery pack 10 using, for example, a table as shown in FIG. Then, the display processing unit 210 generates drawing data to be displayed on the display unit 220 such as a display device based on the converted remaining capacity of the battery pack 10 and displays the drawing data on the display unit 220. Alternatively, the display processing unit 210 causes a light emitting element such as an LED indicating the remaining capacity to emit light according to the output voltage of the battery pack 10 in S804.
  • the processes of S804 to S808 described above are repeatedly executed at regular intervals or at predetermined intervals until the use of power in the electronic device 20 is completed or the capacity of the battery pack 10 is exhausted (until S802: NO).
  • the output voltage of the battery pack 10 is converted into the remaining capacity of the battery pack 10 and displayed on the display unit 220. Moreover, the voltage of each battery cell included in the battery unit 110 is equalized at least in the vicinity of the discharge end voltage, as described in the above embodiments. That is, in the battery pack 10, due to variations of each battery cell, etc., it is suppressed that a certain battery cell reaches the discharge end voltage before other battery cells and becomes unusable as a whole battery pack 10, The output voltage of the battery pack 10 accurately indicates the remaining capacity of the battery pack 10. Thereby, in this embodiment, the remaining capacity of the battery pack 10 can be correctly notified by the user of the electronic device 20. In particular, it is possible to accurately notify the “timing at which the battery pack 10 can no longer be used” which is important for the user of the electronic device 20.
  • the control means includes As the first condition, when the voltage of the lowest voltage cell is equal to or lower than a reference voltage set as a voltage higher than the discharge end voltage of the battery cell, the balance circuit unit is operated. 1. The battery pack described in 1. 3.
  • the reference voltage is set as a value obtained by adding 10% to 30% of the difference between the rated charge voltage of the battery cell and the discharge end voltage to the discharge end voltage.
  • the control means includes When the differential value of the difference between the lowest voltage cell and the highest voltage cell having the highest voltage among the plurality of battery cells is equal to or higher than a predetermined threshold as the first condition, the balance circuit unit is operated. 1. To 3. The battery pack according to any one of the above. 5.
  • the battery cell is a first type secondary battery
  • the battery pack Connected to an electronic device designed on the premise of using a second type of secondary battery different from the first type, Using the conversion condition for converting the relational expression between the voltage and the remaining capacity in the first type secondary battery into the relational expression between the voltage and the remaining capacity in the second type secondary battery, A voltage converting means for converting the voltage of the plurality of battery cells; 1. To 4.
  • the first type secondary battery is a lithium ion secondary battery
  • the second type secondary battery is a lead acid battery. 5.
  • a battery pack according to any one of Display processing means for calculating the remaining capacity of the battery pack based on the output voltage of the battery pack and displaying the remaining capacity of the battery pack; Electronic equipment comprising. 8).
  • a balance circuit unit for performing a balance operation for aligning voltages of a plurality of battery cells connected in series; Discharging the plurality of battery cells is a condition relating to the voltage of the lowest voltage cell having the lowest voltage among the plurality of battery cells and indicating that the lowest voltage cell is approaching a timing at which discharge is impossible.
  • a cell balance device comprising: 9.
  • the control means includes As the first condition, when the voltage of the lowest voltage cell is equal to or lower than a reference voltage set as a voltage higher than the discharge end voltage of the battery cell, the balance circuit unit is operated. 8).
  • the cell balance apparatus as described in. 10.
  • the reference voltage is set as a value obtained by adding 10% to 30% of the difference between the rated charge voltage of the battery cell and the discharge end voltage to the discharge end voltage.
  • the cell balance apparatus as described in. 11.
  • the control means includes When the differential value of the difference between the lowest voltage cell and the highest voltage cell having the highest voltage among the plurality of battery cells is equal to or higher than a predetermined threshold as the first condition, the balance circuit unit is operated. 8). To 10.
  • the cell balance apparatus as described in any one of these.
  • the battery cell is a first type secondary battery,
  • the plurality of battery cells are included in a battery pack,
  • the battery pack Connected to an electronic device designed on the premise of using a second type of secondary battery different from the first type, Using the conversion condition for converting the relational expression between the voltage and the remaining capacity in the first type secondary battery into the relational expression between the voltage and the remaining capacity in the second type secondary battery, A voltage converting means for converting the voltage of the plurality of battery cells; 8).
  • the cell balance apparatus as described in any one of these.
  • the first type secondary battery is a lithium ion secondary battery
  • the second type secondary battery is a lead acid battery. 12
  • the cell balance apparatus as described in.
  • a cell balance device having a balance circuit unit that performs a balance operation for aligning the voltages of the plurality of battery cells, Discharging the plurality of battery cells is a condition relating to the voltage of the lowest voltage cell having the lowest voltage among the plurality of battery cells and indicating that the lowest voltage cell is approaching a timing at which discharge is impossible.
  • the balance circuit unit is operated.
  • a cell balance method comprising: 15. The cell balance device is As the first condition, when the voltage of the lowest voltage cell is equal to or lower than a reference voltage set as a voltage higher than the discharge end voltage of the battery cell, the balance circuit unit is operated. Including. The cell balance method described in 1. 16.
  • the reference voltage is set as a value obtained by adding 10% to 30% of the difference between the rated charge voltage of the battery cell and the discharge end voltage to the discharge end voltage. 15. Including The cell balance method described in 1. 17.
  • the cell balance device is When the differential value of the difference between the lowest voltage cell and the highest voltage cell having the highest voltage among the plurality of battery cells is equal to or higher than a predetermined threshold as the first condition, the balance circuit unit is operated. Including. To 16. The cell balance method according to any one of the above. 18.
  • the battery cell is a first type secondary battery,
  • the plurality of battery cells are included in a battery pack,
  • the battery pack Connected to an electronic device designed on the assumption that a second type of secondary battery different from the first type is used;
  • the cell balance device is Using the conversion condition for converting the relational expression between the voltage and the remaining capacity in the first type secondary battery into the relational expression between the voltage and the remaining capacity in the second type secondary battery, Convert the voltage of multiple battery cells, Including.
  • the cell balance method according to any one of the above.
  • the first type secondary battery is a lithium ion secondary battery
  • the second type secondary battery is a lead acid battery. 18.
  • a cell balance device having a balance circuit unit for performing a balance operation for aligning the voltages of the plurality of battery cells, Discharging the plurality of battery cells is a condition relating to the voltage of the lowest voltage cell having the lowest voltage among the plurality of battery cells and indicating that the lowest voltage cell is approaching a timing at which discharge is impossible.
  • Control means for operating the balance circuit section when the inside is satisfied Program to function as. 21.
  • the control means includes As the first condition, when the voltage of the lowest voltage cell is equal to or lower than a reference voltage set as a voltage higher than the discharge end voltage of the battery cell, the balance circuit unit is operated. 20.
  • the reference voltage is set as a value obtained by adding 10% to 30% of the difference between the rated charge voltage of the battery cell and the discharge end voltage to the discharge end voltage. 21.
  • the control means includes When the differential value of the difference between the lowest voltage cell and the highest voltage cell having the highest voltage among the plurality of battery cells is equal to or higher than a predetermined threshold as the first condition, the balance circuit unit is operated. 20. To 22. The program as described in any one of these. 24.
  • the battery cell is a first type secondary battery,
  • the plurality of battery cells are included in a battery pack,
  • the battery pack Connected to an electronic device designed on the assumption that a second type of secondary battery different from the first type is used;
  • the cell balance device Using the conversion condition for converting the relational expression between the voltage and the remaining capacity in the first type secondary battery into the relational expression between the voltage and the remaining capacity in the second type secondary battery, Voltage conversion means for converting the voltage of a plurality of battery cells; Further function as 20.
  • the program as described in any one of these. 25.
  • the first type secondary battery is a lithium ion secondary battery
  • the second type secondary battery is a lead acid battery. 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne un bloc-batterie (10) qui comprend les éléments suivants : de multiples cellules de batterie (partie batterie (110)) connectées en série ; une partie circuit d'équilibrage (120) pour exécuter une opération d'équilibrage par laquelle la tension des multiples cellules de batterie est rendue uniforme ; et une partie de commande (130) pour actionner la partie circuit d'équilibrage si une première condition est satisfaite pendant la décharge des multiples cellules de batteries, cette première condition étant une condition relative à la tension de la cellule à plus basse tension qui a la tension la plus basse parmi les multiples cellules de batterie, et indiquer l'approche de l'instant auquel la décharge de la cellule à plus basse tension n'est pas autorisée.
PCT/JP2015/084351 2014-12-15 2015-12-08 Bloc-batterie, instrument électronique, dispositif d'équilibrage de cellules, procédé d'équilibrage de cellules, et programme WO2016098631A1 (fr)

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JP2016564793A JPWO2016098631A1 (ja) 2014-12-15 2015-12-08 電池パック、電子機器、セルバランス装置、セルバランス方法、およびプログラム

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JP2014-253392 2014-12-15
JP2014253392 2014-12-15

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JP2018023257A (ja) * 2016-08-05 2018-02-08 株式会社Ｇｓユアサ 蓄電装置、蓄電装置の制御方法、車両
JP2019017215A (ja) * 2017-07-10 2019-01-31 田淵電機株式会社 蓄電装置及びその均等化方法
JP2019525706A (ja) * 2016-10-12 2019-09-05 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Ｇｕａｎｇｄｏｎｇ Ｏｐｐｏ Ｍｏｂｉｌｅ Ｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓ Ｃｏｒｐ．， Ｌｔｄ． バッテリ管理回路、被充電機器及び電源管理方法
JP2020054161A (ja) * 2018-09-28 2020-04-02 パナソニックＩｐマネジメント株式会社 電源装置
WO2021065443A1 (fr) * 2019-10-02 2021-04-08 株式会社日立製作所 Dispositif d'estimation d'état de batterie
CN112737026A (zh) * 2020-12-28 2021-04-30 潍柴动力股份有限公司 电池充电的控制方法、装置、电子设备以及存储介质
US11056896B2 (en) 2016-10-12 2021-07-06 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Terminal and device
US11631985B2 (en) 2017-04-13 2023-04-18 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Device to be charged with multiple charging channels, charging method, and charging control circuit with multiple charging channels
JP7389199B1 (ja) 2022-09-15 2023-11-29 太普動力新能源（常熟）股▲ふん▼有限公司 電池寿命延長方法

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JP2018023257A (ja) * 2016-08-05 2018-02-08 株式会社Ｇｓユアサ 蓄電装置、蓄電装置の制御方法、車両
CN107689464A (zh) * 2016-08-05 2018-02-13 株式会社杰士汤浅国际 蓄电装置、蓄电装置的控制方法、车辆
CN107689464B (zh) * 2016-08-05 2022-06-28 株式会社杰士汤浅国际 蓄电装置、蓄电装置的控制方法、车辆
JP2019525706A (ja) * 2016-10-12 2019-09-05 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Ｇｕａｎｇｄｏｎｇ Ｏｐｐｏ Ｍｏｂｉｌｅ Ｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓ Ｃｏｒｐ．， Ｌｔｄ． バッテリ管理回路、被充電機器及び電源管理方法
JP2019193566A (ja) * 2016-10-12 2019-10-31 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Ｇｕａｎｇｄｏｎｇｏｐｐｏ Ｍｏｂｉｌｅ Ｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓ Ｃｏｒｐ．， Ｌｔｄ． 被充電機器及び充電方法
JP2019195266A (ja) * 2016-10-12 2019-11-07 オッポ広東移動通信有限公司 被充電機器と充電方法
US10727679B2 (en) 2016-10-12 2020-07-28 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Chargeable device and charging method
US10826303B2 (en) 2016-10-12 2020-11-03 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Chargeable device and charging method
US11322949B2 (en) 2016-10-12 2022-05-03 Guangdong Oppo Mobile Telecommunication Corp., Ltd. Battery management circuit, device to be charged, and power management method
US11056896B2 (en) 2016-10-12 2021-07-06 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Terminal and device
CN113131570A (zh) * 2016-10-12 2021-07-16 Oppo广东移动通信有限公司 电池管理电路、待充电设备和电源管理方法
US11631985B2 (en) 2017-04-13 2023-04-18 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Device to be charged with multiple charging channels, charging method, and charging control circuit with multiple charging channels
JP2019017215A (ja) * 2017-07-10 2019-01-31 田淵電機株式会社 蓄電装置及びその均等化方法
JP7170219B2 (ja) 2018-09-28 2022-11-14 パナソニックＩｐマネジメント株式会社 電源装置
JP2020054161A (ja) * 2018-09-28 2020-04-02 パナソニックＩｐマネジメント株式会社 電源装置
WO2021065443A1 (fr) * 2019-10-02 2021-04-08 株式会社日立製作所 Dispositif d'estimation d'état de batterie
US11841402B2 (en) 2019-10-02 2023-12-12 Hitachi, Ltd. Battery state estimation device
CN112737026A (zh) * 2020-12-28 2021-04-30 潍柴动力股份有限公司 电池充电的控制方法、装置、电子设备以及存储介质
JP7389199B1 (ja) 2022-09-15 2023-11-29 太普動力新能源（常熟）股▲ふん▼有限公司 電池寿命延長方法
JP2024042167A (ja) * 2022-09-15 2024-03-28 太普動力新能源（常熟）股▲ふん▼有限公司 電池寿命延長方法

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