WO2014061421A1 - 均等化装置 - Google Patents
均等化装置 Download PDFInfo
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- WO2014061421A1 WO2014061421A1 PCT/JP2013/076141 JP2013076141W WO2014061421A1 WO 2014061421 A1 WO2014061421 A1 WO 2014061421A1 JP 2013076141 W JP2013076141 W JP 2013076141W WO 2014061421 A1 WO2014061421 A1 WO 2014061421A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0018—Circuits for equalisation of charge between batteries using separate charge circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to an equalizing device, and more particularly, to an equalizing device that equalizes voltages across a plurality of unit cells connected in series with each other.
- an assembled battery mounted on a hybrid vehicle or an electric vehicle is composed of a plurality of unit cells connected in series with each other, a high voltage such as 200 V is generated at both ends thereof, and the generated power is supplied to a drive motor.
- a high voltage such as 200 V
- the generated power is supplied to a drive motor.
- an equalization device uses a discharge resistor to perform equalization by discharging so that the voltage across the unit battery approaches a minimum value (for example, Patent Document 1).
- the equalizing device detects the voltage across the unit cells C 1 to C 5 using the ignition off as a trigger, sets the minimum value among the detected voltages across the unit cells C 1 to C 5 as the reference voltage, A voltage slightly higher than that is set as the target voltage (threshold 1), and a voltage higher than the target voltage is set as the threshold 2.
- the equalization device starts equalization when any one of the unit cells C 1 to C 5 has a voltage across the threshold voltage greater than threshold 1, and the unit cell C 1 whose voltage across the target voltage exceeds the target voltage. , C 2 , C 3 and C 5 are discharged for a specified time.
- an object of the present invention is to provide an equalization apparatus that can quickly and accurately equalize with a simple configuration.
- the voltage detection device is an equalization device that equalizes voltages across a plurality of unit cells connected in series with each other, A voltage detection unit for detecting a voltage at both ends, a plurality of discharge resistors provided for each unit cell for discharging the unit cell, a plurality of switches for connecting the unit cell to the discharge resistor, and the switch
- An equalization unit that controls and equalizes the unit cells, and the equalization unit uses the lowest voltage across the terminals detected by the voltage detection unit as a reference voltage, and the reference voltage
- a classifying unit that classifies the magnitude of the voltage across the unit battery into three or more according to a difference between the voltage across the unit battery detected by the voltage detection unit, and the class that is closest to the reference voltage.
- the switch control unit of the voltage detection device according to the first aspect may discharge all unit cells other than the division closest to the reference voltage among the divisions. Is provided to control the on / off of the switch so as to stop discharging in order from the unit cells of the section close to the reference voltage.
- the switch control unit of the voltage detection device according to the first aspect may keep all unit cells other than the division closest to the reference voltage among the divisions constant.
- a device for controlling on / off of the switch so as to stop the discharge for a certain period of time in order from the unit battery in a section close to the reference voltage, intermittently repeating the discharge for a certain period of time.
- the unit cells can be discharged in a stepwise discharge time for each section corresponding to the voltage at both ends, and can be quickly and accurately equalized with a simple configuration.
- FIG. 1 is a block diagram showing an embodiment of the equalization apparatus of the present invention.
- FIG. 2 is a circuit diagram showing details of the equalization block constituting the equalization apparatus shown in FIG.
- FIGS. 3A to 3C are explanatory diagrams for explaining the operation of the equalization apparatus shown in FIG.
- FIG. 4 is a flowchart showing the equalization control processing procedure of the MCU constituting the equalization apparatus shown in FIG. 1 in the first embodiment.
- FIG. 5 is a flowchart showing the equalization control processing procedure of the MCU constituting the equalization apparatus shown in FIG. 1 in the second embodiment.
- FIG. 6A is a graph showing an example of both-end voltages of the unit voltages B1 to B5.
- FIG. 6B shows the discharge of the unit voltages B1 to B5 having the both-end voltages shown in FIG. 6A for a specified time. It is a graph which shows the both-ends voltage after doing.
- the equalizing device 1 is a device that equalizes the voltage across the plurality of unit cells C 1 to C 60 that are connected in series to each other that constitute the assembled battery BH.
- Each of the unit batteries C 1 to C 60 is composed of one secondary battery in the present embodiment, but may be composed of a plurality of secondary batteries.
- the assembled battery BH is used as a power source for the electric motor in, for example, a hybrid electric vehicle that uses an engine and an electric motor (both not shown) as a travel drive source.
- the assembled battery BH is connected to both ends thereof with the electric motor as a load as necessary, and an alternator or the like (not shown) as a charger as necessary.
- the unit batteries C 1 to C 60 are divided into, for example, six blocks B1 to B6. That is, the assembled battery BH includes six blocks B1 to B6. Each of the blocks B1 to B6 is composed of, for example, 10 unit batteries.
- the equalizing device 1 controls a plurality of equalizing blocks 31 to 36 that equalize the unit cells C 1 to C 60 and the entire device, and serves as an equalizing unit that controls the equalizing blocks 31 to 36.
- the equalization blocks 31 to 36 are provided for each of the blocks B1 to B6, and operate by receiving power supply from the corresponding blocks B1 to B6. Further, the equalization blocks 31 to 36 detect the voltages at both ends of the unit batteries C 1 to C 60 constituting the corresponding blocks B1 to B6, respectively, and transmit the detected voltages to the MCU 4, and the corresponding block B1 according to a command from the MCU 4 The unit cells C 1 to C 60 constituting B 6 are discharged to perform equalization.
- the MCU 4 is composed of a microcomputer and operates by receiving power supply from a low-voltage battery (not shown) different from the assembled battery BH.
- Equalization block 36 a monitoring IC5, + side of each unit cell C 1 ⁇ C 10 - (hereinafter abbreviated as "LPF") a plurality of low-pass filter provided between the monitoring IC5 and 6, the unit cell C 1 ⁇ It includes a plurality of discharge resistor Rd provided for each C 10, a plurality of switches Q connected to the discharge resistor Rd in series between the respective unit cells C 1 ⁇ C 10, a.
- Each LPF 6 is a so-called CR filter comprising a resistor R1 and a capacitor C as shown in FIG.
- the resistor R1 is connected between the + side of the unit cells C 1 to C 10 and the monitoring IC 5.
- the capacitor C is connected between the connection point of the resistor R1 and the monitoring IC 5 and the negative electrode of the corresponding block B6.
- This LPF6 is provided between the unit cells C 1 ⁇ C 10 and monitoring IC5, supplies monitoring IC5 by cutting high-frequency components from the + side potential of the unit cell C 1 ⁇ C 10.
- each discharge resistor Rd is connected to the + side of each of the unit cells C 1 to C 10 .
- the switch Q is composed of, for example, an N-channel field effect transistor, the drain is connected to the other end of the discharge resistor Rd, and the source is connected to the negative side of the unit cells C 1 to C 10 .
- both ends of the discharge resistor Rd of the unit cell C 1 ⁇ C 10 are connected, the unit cell C 1 ⁇ C 10 are discharged.
- the switch Q is turned off, the connection between the unit cells C 1 to C 10 and the discharge resistor Rd is disconnected, and the discharge of the unit cells C 1 to C 10 is stopped.
- a resistor R2 is connected between the gate and the source of the switch Q, and the gate of the switch Q is connected to the monitoring IC 5 via the resistor R3, and the monitoring IC 5 controls the on / off thereof.
- Monitoring IC5 is connected to both ends of the unit cells C 1 ⁇ C 10, a multiplexer 51 connected to the input of the A / D converter 52 to be described later by selecting one of the ends of the unit cells C 1 ⁇ C 10,
- An A / D converter 52 as a voltage detection unit that converts an input analog voltage into digital and outputs the digital voltage to the control unit 53, and a control unit 53 that controls the entire monitoring IC 5 are provided.
- control units 53 of the equalization blocks 31 to 36 are connected to each other in series, and only the control unit 53 of the equalization block 36 having the lowest potential communicates directly with the MCU 4 via the insulation I / F 7. Can do.
- the control unit 53 of the equalization blocks 32 to 35 other than the lowest potential communicates with the MCU 4 via the control unit 53 on the lower potential side than itself.
- the control unit 53 controls the multiplexer 51 to sequentially input the + side of the unit batteries C 1 to C 10 to the A / D converter 52.
- the A / D converter 52 sequentially A / D converts the positive side potentials of the unit batteries C 1 to C 10 and supplies them to the control unit 53.
- the control unit 53 transmits the digital value of the positive potential of the unit batteries C 1 to C 10 from the A / D converter 52 to the MCU 4 as a detection voltage.
- the control unit 53 of the equalization block 36 can directly communicate with the MCU 4, it directly transmits to the MCU 4.
- the control unit 53 of the equalization blocks 31 to 35 transmits this detected voltage to the MCU 4 via the control unit 53 of the equalization blocks 32 to 36 on the lower potential side than itself.
- the control unit 53 is connected to the gate of each switch Q, and controls on / off of each switch Q according to an on / off signal transmitted from the MCU 4.
- the MCU 4 sets the both-ends voltage of the unit battery C 4 having the lowest end-to-end voltage among all the unit batteries C 1 to C 5 constituting the assembled battery BH as a reference voltage, Depending on the difference between the reference voltage and the voltage across the unit batteries C 1 to C 5 , the magnitudes of the voltages across the unit batteries C 1 to C 5 are “no discharge”, “discharge short”, “discharge normal”. And “Discharge Long”.
- the above classification is performed by comparison with a plurality of threshold values 1 to 3 set for the reference voltage. That is, the MCU 4 sets a voltage slightly higher than the reference voltage as the threshold 1 (target voltage), sets a voltage higher than the threshold 1 as the threshold 2, and sets a voltage higher than the threshold 2 as the threshold 3. .
- the MCU 4 determines that equalization needs to be performed if any one of the unit batteries C 1 to C 5 is higher than the threshold value 1 (target voltage).
- MCU 4 compares the voltage across the plurality of thresholds 1 to 3 and the unit cells C 1 ⁇ C 5, dividing the magnitude of the voltage across the unit cell C 1 ⁇ C 5.
- a unit cell with both-end voltage ⁇ threshold 1 is “no discharge”
- a unit cell with threshold 2> both-end voltage ⁇ threshold 1 is “discharge short”
- a unit cell with threshold 3> both-end voltage ⁇ threshold 2 is The unit battery with the voltage across both ends> threshold value 3 is classified as “discharge long” and “discharge normal”.
- the unit battery C 5 is classified as “discharge long”
- the unit batteries C 1 and C 3 are classified as “discharge normal”
- the unit battery C 2 is classified as “discharge short”.
- the unit battery C 4 is classified as “no discharge”.
- the MCU 4 starts discharging all unit cells C 1 to C 3 and C 5 other than the section “no discharge” closest to the reference voltage among the sections, and then the section “discharge short” close to the reference voltage.
- the unit battery C 2 discharge is stopped, then the discharge of the unit batteries C 1 and C 3 of the category “discharge normal” close to the reference voltage is stopped, and finally the unit of the category “discharge long” farthest from the reference voltage stopping the discharge of the battery C 5.
- the discharge amount of “discharge long” is hatched by parallel diagonal lines, and the discharge amount of “discharge normal” is hatched by crossing diagonal lines.
- the amount of discharge is drawn by hatching filled with black. Thereby, as shown in FIG. 3B, the discharge amount can be decreased in the order of “discharge long”, “discharge normal”, and “discharge short”. This is repeated until all the voltages across the unit batteries C 1 to C 5 are equal to or lower than the threshold value 1 (target voltage).
- the unit batteries C 1 and C 5 are larger than the threshold value 1 (target voltage) as shown in FIG. Then, the voltages at both ends of the unit batteries C 1 to C 5 are again detected and classified. In the example shown in FIG. 3B, the unit cells C 1 and C 5 are classified as “discharge short”, and the unit cells C 2 to C 4 are classified as “no discharge”. Next, the MCU 4 starts discharging all the unit cells C 1 and C 5 other than the section “no discharge”, and first discharges the unit batteries C 1 and C 5 of the “discharge short” whose voltage classification is small. Stop.
- the discharge of all the unit batteries C 1 to C 5 ends here.
- the voltage across both unit batteries C 1 to C 5 has a threshold value of 1. Since it is equal to (target voltage) or less and is classified as “no discharge”, the equalization ends here.
- the MCU 4 detects the voltage across the unit cells C 1 to C 5 at regular time intervals, and restarts equalization when a variation of the threshold value 2 or more occurs.
- the MCU 4 starts the equalization control process when it is determined that equalization is necessary, or when an equalization command is output from a host system (not shown) in response to a trigger such as turning on or off the ignition switch.
- the MCU 4 waits for a voltage stabilization time for the voltage across the unit batteries C 1 to C 60 to stabilize (step S1).
- the MCU 4 sequentially outputs a voltage detection command to the control unit 53 of each equalization block 31 to 36, and detects the voltage across the unit batteries C 1 to C 60 (step S2).
- the control unit 53 of each equalization block 31 to 36 determines whether or not the destination is addressed to itself.
- the voltage detection command is transferred to the control unit 53 of the equalization blocks 31 to 35 adjacent to the high potential side.
- the multiplexer 51 is controlled to connect the + side potentials of the unit batteries C 1 to C 60 to the input of the A / D converter 52 in sequence.
- the A / D converter 52 sequentially A / D converts the + side potentials of the unit cells C 1 to C 60
- the control unit 53 sequentially transmits them to the MCU 4 as detection voltages.
- the detection voltage transmitted from the control unit 53 of the equalization block 36 is directly transmitted to the MCU 4.
- the detection voltage transmitted from the control unit 53 of the equalization blocks 31 to 35 is transmitted to the MCU 4 via the control unit 53 of the equalization blocks 32 to 36 on the lower potential side than itself.
- the + side potentials of the unit batteries C 1 to C 60 are sequentially transmitted to the MCU 4, and the MCU 4 that has received them calculates the voltage across the unit batteries C 1 to C 60 .
- the MCU 4 functions as a threshold value setting unit, and sets the lowest voltage among the detected voltages across the unit cells C 1 to C 60 as a reference voltage, and a plurality of threshold values 1 that increase stepwise with respect to the reference voltage. To 3 are set (step S3).
- the MCU 4 determines whether or not there is a voltage across the unit batteries C 1 to C 60 that is equal to or higher than the threshold value 1 (target voltage) (step S4). When there is no threshold value 1 (target voltage) or more (if “false” in step S4, “false” is described as “N” hereinafter), the MCU 4 does not need to equalize. And waits for a predetermined time to elapse (step S24), and returns to step S2.
- step S5 serves as the partitioning portion, compares the voltage across the plurality of thresholds 1 to 3 and the unit cells C 1 ⁇ C 60, "no discharge” the size of each unit cell C 1 ⁇ C 60, “discharge short”, " It is divided into four types, “discharge normal” and “discharge long”. More specifically, the MCU 4 first sets n ⁇ n + 1 (step S5).
- MCU 4 as long across voltage Vn of the unit cell C n is exceeding the third threshold (at step S6 Y), the magnitude of the voltage across Vn of the unit cell C n is classified as "discharge long" (step S12 ).
- MCU 4 is lower than than the voltage across Vn threshold 3 unit cells C n, and, if exceeding the second threshold (Y in step S7), and the magnitude of the voltage across Vn of the unit cell C n "discharge normal" (Step S11). Further, MCU 4 is the voltage across Vn of the unit cell C n is less than the threshold 2, and, if exceeding the first threshold (Y in step S8), and the magnitude of the voltage across Vn of the unit cell C n "discharge short” (Step S10). Further, MCU 4, as long below from both ends voltage Vn threshold 1 unit cell C n (in step S8 N), the magnitude of the voltage across Vn of the unit cell C n is divided into "no discharge" (step S9 ).
- step S14 the MCU 4 sends an on / off signal of the switch Q for discharging the unit cells C 1 to C 60 classified into “discharge long”, “discharge normal” and “discharge short” other than “no discharge”. Transmit to the equalization blocks 31-36.
- the control unit 53 of each of the equalization blocks 31 to 36 receives an on / off signal addressed to itself, the control unit 53 turns on / off the switch Q in accordance with the on / off signal.
- both ends of the unit cells C 1 to C 60 divided into “discharge long”, “discharge normal” and “discharge short” are connected to the discharge resistor Rd and discharged.
- the MCU 4 waits for the first discharge time to elapse (step S15), and transmits an ON / OFF signal for stopping the discharge of the unit cells classified as “discharge short” to each of the equalization blocks 31 to 36 ( Step S16).
- the control unit 53 of each of the equalization blocks 31 to 36 receives an on / off signal addressed to itself, the control unit 53 turns on / off the switch Q according to the on / off signal.
- both ends of the unit cells C 1 to C 60 classified as “discharge short-circuit” are disconnected from the discharge resistor Rd, and the discharge is stopped.
- step S17 Thereafter, if there is no unit battery C 1 to C 60 classified into “discharge normal” and “discharge long” (N in step S17), the MCU 4 immediately proceeds to step S23 and ends the unit batteries C 1 to C 60 . After waiting for a voltage stabilization time for the voltage to stabilize, the process returns to step S2. On the other hand, if there are unit cells C 1 to C 60 classified as “discharge normal” and “discharge long” (Y in step S17), the MCU 4 waits for the second discharge time to elapse (step S18), An on / off signal for stopping the discharge of the unit cells C 1 to C 60 classified as “discharge normal” is transmitted to the equalization blocks 31 to 36 (step S19).
- control unit 53 of each of the equalization blocks 31 to 36 receives an on / off signal addressed to itself, the control unit 53 turns on / off the switch Q in accordance with the on / off signal. As a result, both ends of the unit cells C 1 to C 60 classified as “discharge normal” are disconnected from the discharge resistor Rd, and the discharge is stopped.
- step S20 Thereafter, if there are no unit batteries C 1 to C 60 classified as “discharge long” (N in step S20), the MCU 4 immediately proceeds to step S23 and then returns to step S2. On the other hand, if there are unit cells C 1 to C 60 classified as “discharge long” (Y in step S20), the MCU 4 waits for the third discharge time to elapse (step S21) and changes to “discharge long”. After an on / off signal for stopping the discharge of the divided unit cells is transmitted to each of the equalization blocks 31 to 36 (step S22), the process proceeds to step S23.
- control unit 53 of each of the equalization blocks 31 to 36 receives an on / off signal addressed to itself, the control unit 53 turns on / off the switch Q in accordance with the on / off signal. As a result, both ends of the unit cells C 1 to C 60 classified as “discharge long” are disconnected from the discharge resistor Rd, and the discharge is stopped.
- the MCU 4 does not discharge the unit cell of the section “no discharge” closest to the reference voltage, and the unit cell of the other section discharges longer as the section farther from the reference voltage. Controls on / off.
- the discharge will be described with reference to FIGS. 3A to 3C.
- the discharge time increases and the discharge amount increases in the order of the unit batteries C 5 categorized as “discharge long”. Therefore, the unit cells C 1 to C 60 can be discharged in a stepwise discharge time for each section corresponding to the both-end voltages, and can be quickly and accurately equalized with a simple configuration.
- a plurality of threshold values are set, and the discharge time is divided into how many patterns (three patterns in the first embodiment).
- the RAM area used by the monitoring IC 5 can be reduced.
- the monitoring IC 5 enters a sleep state, and thereafter the monitoring IC 5 is woken up every time the switch Q is switched on and off to perform the next discharge. Therefore, when the discharge time is calculated and set for each of the unit cells C 1 to C 60 , the monitoring IC 5 needs to wake up for the number of unit cells that need to be discharged. By dividing it, it is possible to reduce the number of times that the monitoring IC 5 wakes up and to reduce current consumption.
- the MCU 4 executes steps S1 to S13 in the same manner as in the first embodiment, when it is determined that equalization is necessary, or according to a trigger such as turning on or off the ignition switch.
- steps S10 to S12 the MCU 4 classifies the voltage across the unit battery Cn into “no discharge”, “discharge short”, “discharge normal”, and “discharge long”, and other than “no discharge”.
- the MCU 4 transmits to the equalization blocks 31 to 36 an on / off signal of the switch Q that discharges the unit cells C 1 to C 60 classified as m ⁇ a (step S25).
- the control unit 53 of each of the equalization blocks 31 to 36 receives an on / off signal addressed to itself, the control unit 53 turns on / off the switch Q in accordance with the on / off signal.
- both ends of the unit cells C 1 to C 60 divided into m ⁇ a are connected to the discharge resistor Rd and discharged.
- the MCU 4 intermittently repeats the discharge for a fixed time period in which all the unit cells C 1 to C 60 other than the section “no discharge” closest to the reference voltage among the sections are discharged for the discharge time. Discharging is stopped for a certain time in order from the unit cells C 1 to C 60 of the section close to the voltage.
- the “discharge long” unit cells C 1 to C 60 are discharged three times for a fixed time, and the “discharge normal” unit cells C 1 to C 60 are discharged twice for a fixed time.
- the “discharge short” unit cells C 1 to C 60 are discharged once for a fixed time.
- This second embodiment can also obtain the same effects as the first embodiment.
- the number of unit batteries C 1 to C 60 constituting the assembled battery BH is 60, but the present invention is not limited to this.
- the number of unit cells C 1 to C 60 is not limited to 60 as long as it is plural.
- the voltage across the unit batteries C 1 to C 60 is divided into four types of “no discharge”, “discharge long”, “discharge normal”, and “discharge short”.
- the present invention is not limited to this.
- the voltage across the unit batteries C 1 to C 60 may be divided into three or more.
- the threshold value and the number of sections with respect to the reference voltage are constant regardless of variations in the unit cells C 1 to C 60 , but the present invention is not limited to this.
- the threshold value set with respect to the reference voltage is compared with the voltage across the unit battery, and equalization is performed.
- the present invention is not limited to this. For example, a voltage difference between the reference voltage and the voltage across the unit battery may be obtained, and it may be determined whether the voltage difference is below a threshold value.
- An equalization device (1) for equalizing voltages across a plurality of unit cells (C 1 to C 60 ) connected in series with each other, A voltage detector (A / D converter 52) for detecting a voltage across each of the unit batteries; A plurality of discharge resistors (Rd) provided for each unit cell and for discharging the unit cell; A plurality of switches (Q) for connecting the unit cells to the discharge resistors; An equalization unit (MCU4) for controlling the switch to equalize the unit cells; With The equalizing unit is Each unit battery according to the difference between the reference voltage and the both-ends voltage of the unit battery detected by the voltage detection unit, using the smallest end-to-end voltage detected by the voltage detection unit as a reference voltage.
- a section (MCU4) that divides the magnitude of the voltage at both ends into three or more
- a switch control unit (MCU4) that controls on / off of the switch so that the unit battery in the section closest to the reference voltage does not discharge, and the unit battery in the other section discharges longer as the section is farther from the reference voltage.
- an equalizing device (M)
- the switch control unit starts discharging all unit batteries other than the section closest to the reference voltage among the sections, and stops discharging sequentially from the unit cells in the section closest to the reference voltage.
- the equalizing apparatus according to [1], which controls on / off of the switch.
- the switch control unit intermittently repeats a fixed time discharge for discharging for a fixed time all the unit cells other than the section closest to the reference voltage among the sections, and the unit of the section close to the reference voltage
- the unit cells can be discharged in a stepwise discharge time for each section corresponding to the voltage across the terminals, and can be quickly and accurately equalized with a simple configuration.
- the present invention that exhibits this effect is useful in the field of an equalizing device that equalizes the voltages across a plurality of unit cells connected in series with each other.
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Abstract
Description
以下、本発明の均等化装置の一実施形態について図1から図4を参照しながら説明する。図1に示すように、均等化装置1は、組電池BHを構成する互いに直列接続された複数の単位電池C1~C60の両端電圧を均等化する装置である。上記単位電池C1~C60各々は、本実施形態では1つの二次電池から構成されているが、複数の二次電池から構成されていてもよい。
次に、第2実施形態の均等化装置1について説明する。第2実施形態の均等化装置1の構成は、第1実施形態で既に説明した図1に示す構成と同等であるため、ここでは詳細な説明を省略する。次に、第2実施形態の均等化装置1の動作について図5を参照して説明する。なお、上述した図4について説明した第1実施形態での動作と同等のステップについては、同一符号を付してその詳細な説明を省略する。
前記単位電池それぞれの両端電圧を検出する電圧検出部(A/D変換器52)と、
前記単位電池毎に設けられ、前記単位電池を放電するための複数の放電抵抗(Rd)と、
前記単位電池を前記放電抵抗に接続する複数のスイッチ(Q)と、
前記スイッチを制御して前記単位電池の均等化を行う均等化部(MCU4)と、
を備え、
前記均等化部が、
前記電圧検出部により検出された両端電圧のうち最も小さい両端電圧を基準電圧とし、前記基準電圧と、前記電圧検出部により検出された前記単位電池の両端電圧と、の差に応じて各単位電池の両端電圧の大きさを3以上に区分する区分部(MCU4)と、
最も前記基準電圧に近い区分の前記単位電池は放電せず、他の区分の前記単位電池は、前記基準電圧から遠い区分ほど長く放電するように前記スイッチのオンオフを制御するスイッチ制御部(MCU4)と、を有する
均等化装置。
[2] 前記スイッチ制御部が、前記区分のうち最も前記基準電圧に近い区分以外の全ての単位電池の放電を開始し、前記基準電圧に近い区分の前記単位電池から順に放電を停止するように前記スイッチのオンオフを制御する
[1]に記載の均等化装置。
[3] 前記スイッチ制御部が、前記区分のうち最も前記基準電圧に近い区分以外の全ての単位電池を一定時間だけ放電する一定時間放電を間欠的に繰り返し、前記基準電圧の近い区分の前記単位電池から順に前記一定時間放電を停止するように前記スイッチのオンオフを制御する
[1]に記載の均等化装置。
4 MCU(均等化部、区分部、スイッチ制御部)
52 A/D変換器(電圧検出部)
C1~C60 単位電池
Q スイッチ
Rd 放電抵抗
Claims (3)
- 互いに直列接続された複数の単位電池の両端電圧を均等化する均等化装置であって、
前記単位電池それぞれの両端電圧を検出する電圧検出部と、
前記単位電池毎に設けられ、前記単位電池を放電するための複数の放電抵抗と、
前記単位電池を前記放電抵抗に接続する複数のスイッチと、
前記スイッチを制御して前記単位電池の均等化を行う均等化部と、
を備え、
前記均等化部が、
前記電圧検出部により検出された両端電圧のうち最も小さい両端電圧を基準電圧とし、前記基準電圧と、前記電圧検出部により検出された前記単位電池の両端電圧と、の差に応じて各単位電池の両端電圧の大きさを3以上に区分する区分部と、
最も前記基準電圧に近い区分の前記単位電池は放電せず、他の区分の前記単位電池は、前記基準電圧から遠い区分ほど長く放電するように前記スイッチのオンオフを制御するスイッチ制御部と、を有する
均等化装置。 - 前記スイッチ制御部が、前記区分のうち最も前記基準電圧に近い区分以外の全ての単位電池の放電を開始し、前記基準電圧に近い区分の前記単位電池から順に放電を停止するように前記スイッチのオンオフを制御する
請求項1に記載の均等化装置。 - 前記スイッチ制御部が、前記区分のうち最も前記基準電圧に近い区分以外の全ての単位電池を一定時間だけ放電する一定時間放電を間欠的に繰り返し、前記基準電圧の近い区分の前記単位電池から順に前記一定時間放電を停止するように前記スイッチのオンオフを制御する
請求項1に記載の均等化装置。
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CN201380054726.7A CN104769808A (zh) | 2012-10-18 | 2013-09-26 | 均等化装置 |
US14/436,102 US20150295424A1 (en) | 2012-10-18 | 2013-09-26 | Equalization Device |
DE112013005066.8T DE112013005066T5 (de) | 2012-10-18 | 2013-09-26 | Ausgleichsvorrichtung |
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JP2012230605A JP6101039B2 (ja) | 2012-10-18 | 2012-10-18 | 均等化装置 |
JP2012-230605 | 2012-10-18 |
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JP (1) | JP6101039B2 (ja) |
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US9537327B2 (en) * | 2012-12-21 | 2017-01-03 | Lite-On Electronics (Guangzhou) Co., Ltd. | Battery cell balancing control system and battery management method thereof |
JP6555753B2 (ja) * | 2016-01-27 | 2019-08-07 | Fdk株式会社 | 充電回路 |
US10097014B2 (en) * | 2016-06-03 | 2018-10-09 | Nidec Motor Corporation | Battery charger monitor with charge balancing between batteries in a battery supply |
DE102017202204A1 (de) * | 2017-02-13 | 2018-08-16 | Siemens Aktiengesellschaft | Umrichteranordnung |
US11594883B2 (en) * | 2018-01-23 | 2023-02-28 | Tdk Corporation | Direct current power supplying system |
CN108899952B (zh) | 2018-07-25 | 2021-07-27 | 维沃移动通信有限公司 | 一种多电池充放电装置及移动终端 |
DE102020209395A1 (de) * | 2020-07-24 | 2022-01-27 | Robert Bosch Gesellschaft mit beschränkter Haftung | Verfahren zur Erfassung von elektrischen Fehlerzuständen in einem Wechselakkupack und System zur Durchführung des Verfahrens |
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JP2007244142A (ja) * | 2006-03-10 | 2007-09-20 | Hitachi Vehicle Energy Ltd | 電池群制御装置及び電池電源システム |
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JP2011041452A (ja) * | 2009-07-17 | 2011-02-24 | Toshiba Corp | 組電池装置及び車両 |
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JP4374351B2 (ja) * | 2006-04-12 | 2009-12-02 | 矢崎総業株式会社 | 充電状態調整装置 |
JPWO2011118484A1 (ja) * | 2010-03-24 | 2013-07-04 | 株式会社Gsユアサ | 二次電池システム |
JP6106991B2 (ja) * | 2011-09-09 | 2017-04-05 | 株式会社Gsユアサ | 状態管理装置、蓄電素子の均等化方法 |
-
2012
- 2012-10-18 JP JP2012230605A patent/JP6101039B2/ja active Active
-
2013
- 2013-09-26 CN CN201380054726.7A patent/CN104769808A/zh active Pending
- 2013-09-26 WO PCT/JP2013/076141 patent/WO2014061421A1/ja active Application Filing
- 2013-09-26 US US14/436,102 patent/US20150295424A1/en not_active Abandoned
- 2013-09-26 DE DE112013005066.8T patent/DE112013005066T5/de not_active Withdrawn
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JP2007244142A (ja) * | 2006-03-10 | 2007-09-20 | Hitachi Vehicle Energy Ltd | 電池群制御装置及び電池電源システム |
WO2009113530A1 (ja) * | 2008-03-11 | 2009-09-17 | 三洋電機株式会社 | 充電状態均等化装置及びこれを具えた組電池システム |
JP2011041452A (ja) * | 2009-07-17 | 2011-02-24 | Toshiba Corp | 組電池装置及び車両 |
JP2011115015A (ja) * | 2009-11-30 | 2011-06-09 | Sanyo Electric Co Ltd | 均等化装置、それを備えたバッテリシステムおよび電動車両ならびに均等化処理プログラム |
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CN104769808A (zh) | 2015-07-08 |
JP6101039B2 (ja) | 2017-03-22 |
DE112013005066T5 (de) | 2015-07-02 |
JP2014082900A (ja) | 2014-05-08 |
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