WO2011077814A1 - 二次電池電圧検出システム - Google Patents
二次電池電圧検出システム Download PDFInfo
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- WO2011077814A1 WO2011077814A1 PCT/JP2010/068055 JP2010068055W WO2011077814A1 WO 2011077814 A1 WO2011077814 A1 WO 2011077814A1 JP 2010068055 W JP2010068055 W JP 2010068055W WO 2011077814 A1 WO2011077814 A1 WO 2011077814A1
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- voltage
- voltage level
- level conversion
- secondary battery
- abnormality detection
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
-
- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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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
Definitions
- the present invention relates to a secondary battery voltage detection system for detecting a voltage of a multi-series lithium ion secondary battery in a battery pack of a plurality of lithium ion secondary batteries.
- Secondary batteries such as lithium ion secondary batteries input and output energy to and from the outside, so there is a possibility that overcharge or overdischarge may occur depending on the method of use. This phenomenon may adversely affect the secondary battery and may be dangerous. For this reason, it is common to monitor the state of the battery by providing a secondary battery or the like with a protection circuit.
- Detecting abnormalities such as overcharge and overdischarge of the battery in the protection circuit is performed by an abnormality detection unit composed of a cell protection IC or the like.
- an abnormality detection unit composed of a cell protection IC or the like.
- cell protection ICs mounted on the abnormality detection unit.
- One has a serial communication function, and communicates information such as voltage and current of each cell constituting the battery pack with a CPU equipped with a protection circuit. Based on the result, the operation terminal of the abnormality detection unit
- This is a cell protection IC of the type that changes the voltage level and shuts off and connects the switches on the charge and discharge circuits.
- Patent Document 1 there is a technique described in Patent Document 1.
- the other is that it does not have a serial communication function, and the cell protection IC operates independently depending on whether each cell is abnormal, changes the voltage level of the operation terminal of the abnormality detection unit, and the charge and discharge switches on the circuit.
- This is a cell protection IC of the type that performs blocking and connection. In both types, the charge and discharge switches on the circuit are cut off and connected by changing the voltage level of the operating terminal. As an example using such a configuration, there is a technique described in Patent Document 2.
- FIG. 1 is a block diagram showing an example of a configuration of a lithium ion secondary battery pack having an abnormality detection function without having a serial communication function.
- the protection circuit 2 detects at least one abnormality among overcharge, overdischarge, overcurrent, and overheat of the lithium ion secondary battery 1, and based on the detection result, It has a protection function for controlling the interruption and connection of the charging and discharging switch 8 by the outputs from the operation terminals 9 to 12 of the abnormality detection units 3 to 6.
- the abnormality detection method using the abnormality detection units 3 to 6 including the protection IC described above is applied to the lithium ion secondary battery 1 having a large number of series, the number of batteries that can be managed per abnormality detection unit is Depends on the performance of the protection IC. Therefore, in order to apply a general-purpose protection IC to the abnormality detection of the lithium ion secondary battery 1 with the increased number of series, it is also necessary to configure the abnormality detection units 3 to 6 formed of the cell protection IC in series.
- FIG. 2 is a block diagram showing a conventional multi-series battery pack abnormality detection system.
- the voltage levels of the operation terminals 9 to 12 of the abnormality detection units 3 to 6 are greatly different from each other.
- the voltage at the operation terminals 9 to 12 of the abnormality detection units 3 to 6 exceeds 40 V at the maximum.
- the charge and discharge switch 8 often uses elements such as FETs, and the drive voltage range is said to be about 5 to 30 V, and the voltage level at which the charge and discharge switch 8 can be driven on the circuit. Will deviate greatly. Therefore, it is difficult to directly drive the charge and discharge switches 8 on the circuit by the outputs of the operation terminals 9 to 12 of the abnormality detection units 3 to 6.
- the CPU 7 is installed on the circuit, and the voltage levels of the operation terminals 9 to 12 of the abnormality detection units 3 to 6 in the voltage level conversion units A13 to 16, that is, the detections in the abnormality detection units 3 to 6 are detected.
- the voltage reference of the signal is uniformly converted to a voltage level that can be read by the CPU 7, and then converted to a voltage detection level 17 of the CPU 7.
- the CPU 7 determines whether or not there is a cell abnormality, and controls the charging and discharging switch 8 on the circuit by a signal 18 from the CPU 7.
- the voltage level converters A13 to A16 are in an operating state in which current always flows due to the circuit configuration, thereby protecting the current consumption of the voltage level converters A13 to A16.
- the current consumption of the circuit 2 is greatly increased.
- a protection IC set to stop discharge from the battery is selected after the abnormal signal indicating overdischarge from the battery is constantly monitored and the abnormal signal is detected.
- FIG. 3 is a timing chart of signals in the system shown in FIG.
- the signal (K-3) ⁇ Vb (V) of the GND level of the abnormality detection unit 3 is output from the operation terminal 9 of the abnormality detection unit 3 as a normal signal. Is output.
- the current value that flows through the voltage level converter A13 and causes the LED to emit light is 3 Vb / R1 (A). Since the reliability and the like of the lithium ion secondary battery are also improved, normally, the voltage of the cell of each lithium ion secondary battery 1 continues normally for a long time. Therefore, if the cell voltage of each lithium ion secondary battery 1 continues to be in a normal state, the current that causes the LED to emit light, which is the main current consumption of the voltage level conversion unit A13, continues to flow.
- the input voltage supplied to the voltage level converter A13 is also K ⁇ Vb (V)
- the photocoupler LED does not emit light
- the phototransistor has no photocurrent. Does not flow.
- the signal voltage of CPU_Vcc (V) is output as it is to the abnormality detection terminal 17 from the output terminal of the voltage level conversion unit A13, and the CPU 7 determines that an abnormality has occurred in the cell of the lithium ion secondary battery 1, and is charged and discharged.
- the switch 8 is operated to avoid danger.
- the current for causing the LED of the voltage level conversion unit A to emit light is required to be in the order of milliamperes, the current consumption is greatly increased.
- the current consumption of the voltage level conversion unit A has been reduced in order to further reduce the current consumption of the entire protection circuit when extending the operating time of industrial equipment and extending the cruising distance of electric assist bicycles and hybrid cars. Consideration was necessary.
- An object of the present invention is to provide a secondary battery voltage detection system capable of reducing current consumption.
- the voltage detection system of the multi-series lithium ion secondary battery of the present invention is A battery group in which a plurality of lithium ion secondary batteries are connected in series, a charge and discharge switch that is connected between the battery group and an output terminal to perform charging and discharging, and a battery in the battery group is divided into a plurality of blocks A plurality of abnormality detection units that divide and detect each battery voltage, a CPU that performs calculation processing of detection signals of each of the plurality of protection elements including the abnormality detection unit, and between the plurality of protection elements and the CPU
- the secondary battery voltage detection system having a first voltage level conversion unit for uniformizing the voltage reference of the detection signal in A second voltage level converter connected between the plurality of abnormality detectors and the first voltage level converter;
- the CPU outputs a signal for operating the second voltage level conversion unit at a predetermined time interval, and electrically connects a path between the plurality of abnormality detection units and the first voltage level conversion unit. It is characterized by being cut off or connected.
- a protection circuit for a lithium ion secondary battery with a large number of series a plurality of abnormality detection units that detect the battery voltage by dividing the batteries of the battery group into a plurality of blocks, and a plurality of abnormality detection units
- a second voltage level conversion unit is provided in a path between the protection element and the first voltage level conversion unit that unifies the voltage reference of the detection signal between the protection element and the CPU that performs calculation processing of the detection signal of each protection element.
- a plurality of abnormality detection units that detect the battery voltage by dividing the batteries of the battery group into a plurality of blocks
- the voltage level conversion unit of 2 is provided so that the path for detecting battery abnormality can be connected and cut off by the signal from the CPU, and the time for outputting the signal for detecting abnormality of the secondary battery is smaller than the time for not outputting
- FIG. 4 It is a block diagram which shows an example of a structure of the lithium ion secondary battery pack which does not have a serial communication function but has an abnormality detection function. It is a block diagram which shows the abnormality detection system of the conventional multi-series battery pack. 3 is a timing chart of signals in the system shown in FIG. It is a block diagram which shows one Embodiment of the secondary battery voltage detection system of this invention. 5 is a timing chart of signals in the secondary battery voltage detection system shown in FIG. 4.
- FIG. 4 is a block diagram showing an embodiment of the secondary battery voltage detection system of the present invention.
- this embodiment is different from that shown in FIG. 2 in that the second voltage level conversion is performed between the abnormality detection units 3 to 6 and the first voltage level conversion units A13 to A16.
- the parts B20 to B23 it is possible to monitor the state of each cell of the secondary battery at an arbitrary time by the signal of the CPU 7, and to reduce the current consumption that has always occurred in the normal state. .
- the abnormality detection units 3 to 6 are installed in the protection circuit 2 of the lithium ion lithium ion secondary battery 1 having a large number of series, and the operation terminals 9 to 12 and the voltage level conversion unit A13 of the abnormality detection units 3 to 6 are installed.
- Voltage level converters B20 to B23 are installed in the path between the lines 16 to 16 to block and connect the path between the abnormality detection units 3 to 6 and the voltage level converters A13 to A16 by the signal 19 from the CPU 7. Yes.
- the operation terminals 9 to 12 of the abnormality detection units 3 to 6 are located near the protection IC when the protection IC terminal as the protection element becomes the operation terminals 9 to 12 as they are or when the protection IC suction capability is insufficient. In some cases, the operation terminals 9 to 12 exist inside the provided current amplifier circuit.
- the maximum voltage is determined by the output of the lithium ion secondary battery in which the cells of the lithium ion secondary battery are serially connected in an integral multiple, and the abnormality detection unit 3 side is on the lower voltage side. The voltage is higher than that of the abnormality detection unit 6 side.
- the voltage level converters B20 to B23 it is preferable to use an element having a level conversion function and a switching function such as a photocoupler or an electromagnetic relay.
- FIG. 5 is a timing chart of signals in the secondary battery voltage detection system shown in FIG.
- the voltage signal detected by the abnormality detection unit 3 is also set to be (K-3) ⁇ Vb (V) as in the prior art. To do. As a result, the signal voltage at the operation terminal 9 is also (K ⁇ 3) ⁇ Vb (V).
- a signal voltage CPU_Vcc (V) which is a signal 19 for operating the voltage level conversion unit B20, is sent from the CPU 7 to the voltage level conversion unit B20 at an arbitrary time width, for example, Z (s) in the detected periodic interval.
- the LED of the photocoupler of the voltage level converter B20 emits light and is turned on.
- the state of the voltage of each cell of the lithium ion secondary battery 1 is monitored from the abnormality detection unit 9.
- the current value that flows through the voltage level converter B20 and causes the LED to emit light is CPU_Vcc / R4 (A).
- the main consumption current flowing through the voltage level conversion unit A13 is a current value 3Vb / R1 (A) for causing the LED to emit light, and the current value CPU_Vcc / for flowing through the voltage level conversion unit B20 to cause the LED to emit light.
- R4 (A) the current value
- the amount of current consumed per unit time increases when an abnormality is detected by the addition of the voltage level converter B20.
- the voltage level converter B20 operates to electrically connect the path between the operation terminal 9 and the voltage level converter A13. Otherwise, this path As long as the voltage of each cell of the lithium ion secondary battery 1 continues to be normal as in the conventional system described above, the LED emits light. The inefficient operation that keeps the current to flow is eliminated.
- the operation terminal 9 While the path between the operation terminal 9 and the voltage level conversion unit A13 is electrically cut off, the operation terminal 9 is in an open state, and information detected by the abnormality detection unit 3 is transmitted to the CPU 7. Instead, the abnormality detection terminal 17 detects CPU_Vcc. Therefore, in order to prevent malfunction of the CPU 7, it is preferable to set the abnormality detection terminal 17 insensitive. Then, the signal 19 is output at an arbitrary predetermined time or periodically to electrically connect the path between the operation terminal 9 and the voltage level conversion unit A13. While the path is electrically connected, the information detected by the abnormality detection unit 3 is transmitted to the CPU 7, so the abnormality detection terminal 17 cancels the dead setting.
- the voltage signal detected by the abnormality detection unit 3 is expressed as K ⁇ Vb (V) as in the conventional system described above. It is set to be. Therefore, the signal voltage at the operation terminal 9 is also K ⁇ Vb (V).
- the input voltage supplied to the voltage level converter A13 is also K ⁇ Vb (V)
- the voltage level conversion unit B20 cannot operate, and the voltage level conversion unit A13 does not operate in conjunction therewith, and the signal voltage of the CPU_Vcc (V) is output to the abnormality detection terminal 17 as it is.
- the CPU 7 determines that an abnormality has occurred in the cell of the lithium ion secondary battery 1, and operates the charging and discharging switch 8 to avoid danger. At this time, no current consumption flows except for the current that causes the LED of the voltage level converter B20 to emit light.
- the current consumption of the voltage level converters A13 to A16 is X (A) as in the conventional system described above.
- the time of the period interval to detect is set to Y (s).
- the voltage level converters B20 to B23 are operated by the signal from the CPU 7 described above to electrically connect the paths between the abnormality detectors 3 to 6 and the voltage level converters A13 to A16, and the voltage level converters A13 to A16 are connected.
- the method of restricting the operation of is performed, it is consumed when the voltage level conversion units A13 to A16 are operated by Z (s) out of Y (s) and YZ (s) is not operated.
- the current is Z / Y of X (A).
- the current consumption in this embodiment is Z / Y of (X + K) (A). From this, the system of this embodiment can obtain a great effect by setting Y >> Z.
- the present invention is not limited to this, and design changes within a range not departing from the gist of the present invention are also included in the present invention. That is, various changes and modifications that can be naturally made by those skilled in the art are also included in the present invention.
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Abstract
Description
複数のリチウムイオン二次電池が直列に接続された電池群と、前記電池群と出力端子との間に接続されて充放電を行う充電及び放電スイッチと、前記電池群の電池を複数のブロックに分割して各電池電圧を検出する複数の異常検出部と、前記異常検出部を含む複数の保護素子の各々の検出信号の演算処理を行うCPUと、前記複数の保護素子と前記CPUとの間で前記検出信号の電圧基準を一律化する第1の電圧レベル変換部とを有する二次電池電圧検出システムにおいて、
前記複数の異常検出部と前記第1の電圧レベル変換部との間に接続された第2の電圧レベル変換部を有し、
前記CPUは、前記第2の電圧レベル変換部を動作させるための信号を予め定められる時間間隔で出力し、前記複数の異常検出部と前記第一の電圧レベル変換部との経路を、電気的に遮断または接続することを特徴とする。
Claims (1)
- 複数のリチウムイオン二次電池が直列に接続された電池群と、前記電池群と出力端子との間に接続されて充放電を行う充電及び放電スイッチと、前記電池群の電池を複数のブロックに分割して各電池電圧を検出する複数の異常検出部と、前記異常検出部を含む複数の保護素子の各々の検出信号の演算処理を行うCPUと、前記複数の保護素子と前記CPUとの間で前記検出信号の電圧基準を一律化する第1の電圧レベル変換部とを有する二次電池電圧検出システムにおいて、
前記複数の異常検出部と前記第1の電圧レベル変換部との間に接続された第2の電圧レベル変換部を有し、
前記CPUは、前記第2の電圧レベル変換部を動作させるための信号を予め定められる時間間隔で出力し、前記複数の異常検出部と前記第1の電圧レベル変換部との経路を、電気的に遮断または接続することを特徴とする二次電池電圧検出システム。
Priority Applications (2)
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CN201080058863.4A CN102656739B (zh) | 2009-12-24 | 2010-10-14 | 二次电池电压检测系统 |
US13/517,201 US20120249075A1 (en) | 2009-12-24 | 2010-10-14 | Secondary battery voltage detecting system |
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JP2009292854A JP5497421B2 (ja) | 2009-12-24 | 2009-12-24 | 多直列リチウムイオン二次電池情報伝達システム |
JP2009-292854 | 2009-12-24 |
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2010
- 2010-10-14 WO PCT/JP2010/068055 patent/WO2011077814A1/ja active Application Filing
- 2010-10-14 CN CN201080058863.4A patent/CN102656739B/zh active Active
- 2010-10-14 US US13/517,201 patent/US20120249075A1/en not_active Abandoned
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JP2000088898A (ja) * | 1998-09-11 | 2000-03-31 | Matsushita Electric Ind Co Ltd | 電池電圧の検出装置 |
JP2007157403A (ja) * | 2005-12-01 | 2007-06-21 | Sanyo Electric Co Ltd | 電源装置 |
JP2008139261A (ja) * | 2006-12-05 | 2008-06-19 | Panasonic Ev Energy Co Ltd | 組電池の電圧測定装置 |
JP2008182876A (ja) * | 2006-12-28 | 2008-08-07 | Nissan Motor Co Ltd | 組電池の容量調整方法及び装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130066575A1 (en) * | 2010-07-07 | 2013-03-14 | Nec Energy Devices, Ltd. | Voltage measuring circuit and method |
US9395394B2 (en) * | 2010-07-07 | 2016-07-19 | Nec Energy Devices, Ltd. | Voltage measuring circuit and method |
Also Published As
Publication number | Publication date |
---|---|
JP2011134578A (ja) | 2011-07-07 |
CN102656739A (zh) | 2012-09-05 |
US20120249075A1 (en) | 2012-10-04 |
JP5497421B2 (ja) | 2014-05-21 |
CN102656739B (zh) | 2015-07-01 |
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