WO2015174398A1 - バッテリパック、バッテリシステム、及び放電方法 - Google Patents

バッテリパック、バッテリシステム、及び放電方法 Download PDF

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Publication number
WO2015174398A1
WO2015174398A1 PCT/JP2015/063590 JP2015063590W WO2015174398A1 WO 2015174398 A1 WO2015174398 A1 WO 2015174398A1 JP 2015063590 W JP2015063590 W JP 2015063590W WO 2015174398 A1 WO2015174398 A1 WO 2015174398A1
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WO
WIPO (PCT)
Prior art keywords
battery
secondary battery
protection circuit
battery pack
furthermore
Prior art date
Application number
PCT/JP2015/063590
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English (en)
French (fr)
Japanese (ja)
Inventor
裕治 古内
利顕 荒木
Original Assignee
デクセリアルズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by デクセリアルズ株式会社 filed Critical デクセリアルズ株式会社
Priority to KR1020167031339A priority Critical patent/KR102382961B1/ko
Priority to CN201580024838.7A priority patent/CN106463947B/zh
Publication of WO2015174398A1 publication Critical patent/WO2015174398A1/ja

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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
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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
    • 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
    • H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • 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
    • 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
    • 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
    • H02J7/00302—Overcharge protection
    • 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
    • H02J7/00306—Overdischarge protection
    • 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 battery system including a battery pack and a plurality of battery packs, and more particularly to a battery pack, a battery system, and a discharging method capable of appropriately discharging excess current from the inside of the battery pack.
  • a battery pack incorporates a number of protection circuits such as overcharge protection and overdischarge protection, It has a function of shutting off the output of the battery pack in a predetermined case.
  • This type of protection element performs overcharge protection or overdischarge protection operation of the battery pack by turning on / off the output using a FET (Field Effect Transistor) switch built in the battery pack.
  • FET Field Effect Transistor
  • the FET switch is short-circuited for some reason, a lightning surge or the like is applied and an instantaneous large current flows, or the output voltage drops abnormally due to the life of the battery cell, or excessively abnormal Even when the voltage is output, the battery pack and the electronic device must be protected from accidents such as ignition. Therefore, in order to safely shut off the output of the battery cell in any possible abnormal state, a protection element made of a fuse element having a function of cutting off the current path by an external signal is used. .
  • a protection element of a protection circuit for such a lithium ion secondary battery or the like As a protection element of a protection circuit for such a lithium ion secondary battery or the like, as described in Patent Document 1, a first electrode on a current path, a conductor layer connected to a heating element, a second electrode Some fusible conductors are connected to form part of the current path, and the fusible conductor on the current path is melted by self-heating due to overcurrent or by a heating element provided inside the protective element. . In such a protection element, the molten liquid soluble conductor is collected on the conductor layer connected to the heating element, thereby interrupting the current path.
  • a short-circuit element is connected in parallel to each of the LED (Light-Emitting-Diode) elements connected in series, and when the LED is abnormal, the short-circuit element is short-circuited with a predetermined voltage to emit a normal LED.
  • Patent Document 2 A configuration has been proposed (Patent Document 2).
  • Patent Document 2 a plurality of elements each having a predetermined thickness of an insulating barrier layer sandwiched between metals are connected in series.
  • EVs Electric Vehicles
  • HEVs Hybrid Vehicles
  • a lithium ion secondary battery has been used from the viewpoint of energy density and output characteristics.
  • a high voltage and a large current are required.
  • dedicated cells that can withstand high voltages and large currents have been developed, but in many cases due to manufacturing cost problems, it is necessary to connect multiple battery cells in series and in parallel to use general-purpose cells. Secures the correct voltage and current.
  • a module in which a plurality of battery cells are connected in series is used as a battery pack, a plurality of battery packs are arranged in parallel to form a battery system, and parts can be replaced in units of battery packs, thereby improving maintainability. ing.
  • the present invention solves the above-described problems, and provides a battery pack, a battery system, which ensures the safety of the battery system and improves the maintainability by notifying the abnormality of the battery pack using a protection circuit of the battery pack, And an electrical discharge method.
  • a battery pack according to the present invention includes a secondary battery, a main circuit connected in series with the secondary battery, and serving as a charge / discharge path for the secondary battery, and in parallel with the secondary battery.
  • a protection circuit that is connected and consumes power of the secondary battery under a predetermined condition; and a switching unit that shuts off the secondary battery and the main circuit and connects the secondary battery and the protection circuit under a predetermined condition; And an error signal output means for outputting an output current to the protection circuit to the outside as an error signal.
  • the battery system according to the present invention is connected in series with a secondary battery, a secondary battery, a main circuit serving as a power supply path, and connected in parallel with the secondary battery, and consumes internal power under predetermined conditions.
  • a plurality of battery packs having a protection circuit, a secondary battery and the main circuit being cut off, and a switching means for connecting the secondary battery and the protection circuit, and a main circuit and a protection circuit of each battery pack, respectively
  • a control means for controlling input / output from each battery pack, and the control means determines an error of the battery pack when detecting a current output from any protection circuit of each battery pack. It is.
  • the discharge method according to the present invention is a discharge method of a battery pack, which is connected in series with a secondary battery, shuts off the main circuit serving as a power supply path and the secondary battery, and is connected in parallel with the secondary battery.
  • a secondary battery is connected to a protection circuit that consumes internal power under predetermined conditions, and internal discharge is performed by the protection circuit and at least part of the output current to the protection circuit is output to the outside of the battery pack as an error signal. .
  • the present invention when an abnormality of the battery pack is detected, it is possible to switch to the protection circuit and output the current flowing through the protection circuit of the battery pack as an error signal. It becomes easy to specify the battery pack that has notified and output the error signal, and the maintainability of the battery pack can be improved.
  • FIG. 1 is a block diagram illustrating a battery system.
  • FIG. 2 is a block diagram illustrating the configuration of the battery pack.
  • FIG. 3 is a block diagram illustrating the configuration of the battery pack.
  • FIG. 4 is a circuit diagram for explaining the operation of the switching element.
  • FIG. 5 is a circuit diagram for explaining the operation of the battery pack.
  • FIG. 6 is a circuit diagram for explaining the operation of the battery pack.
  • FIG. 7 is a circuit diagram illustrating the operation of the battery pack.
  • the battery system 100 outputs a plurality of battery packs 200, a control unit 300 that is connected to the battery packs 200 and controls charging / discharging of each battery pack 200, and an error signal described later. It is comprised from the alerting
  • each battery pack 200 is a module in which a lithium ion battery and a protection circuit are modularized so that an error signal can be output to the control unit 300 and an internal current can be consumed when the battery is abnormal. Has been.
  • the control unit 300 is configured by an IC circuit or the like, and controls charging of each battery pack 200 and power feeding from each battery pack 200, and performs control to supply current to, for example, motors and various electrical components inside the EV. .
  • the control unit 300 detects an abnormality of the battery pack 200 that issued the error signal based on an error signal from the battery pack 200 described later, and notifies the abnormality of the battery pack 200 using the notification unit 400.
  • the notification unit 400 is connected to the control unit 300 and includes a light emitting unit and a sound unit, and notifies the abnormality of the battery pack 200 by light emission and sound.
  • the specific configuration of the notification unit 400 is substantially the same as the notification unit provided inside the battery pack 200 described later, and thus the description thereof is omitted.
  • the battery pack 200 includes a negative terminal 11 and a positive terminal 12 that are input / output terminals, a first FET (Field Effect Transistor) 13 and a second FET 14, a first FET 13 and a second FET.
  • an LED (Light Emitting Diode) 20 and a heating resistor 21 included in the battery pack 200.
  • the minus terminal 11 and the plus terminal 12 are connected to the control unit 300 of the battery system 100 and form a main circuit (first circuit) that charges and discharges the lithium ion battery 16.
  • the minus terminal 11 and the plus terminal 12 serve as an interface connected to the control unit 300 by a connector together with the external output terminal 19.
  • the first FET 13 and the second FET 14 are transistor elements arranged in series with the lithium ion battery 16 on the main circuit.
  • the first IC 15 is connected to the first FET 13 and the second FET 14, and a first protection circuit is formed by the first FET 13 and the second FET 14 and the first IC 15.
  • the first protection circuit determines that the first IC 15 is connected to an overheat detection sensor (not shown) or the like and the internal temperature of the battery pack 200 is equal to or higher than a predetermined value, and is determined to be higher than the predetermined value Furthermore, in order to protect the lithium ion battery 16 in an overheated state, the first FET 13 or the second FET 14 is driven to shut off the main circuit.
  • the first protection circuit determines whether or not the current value of the main circuit is greater than or equal to a predetermined value when the first IC 15 is connected to a current monitor or the like (not shown). In order to protect the lithium ion battery 16 in the overcurrent state, the first FET 13 or the second FET 14 is driven to shut off the main circuit.
  • the lithium ion battery 16 is configured to have a desired voltage value by arranging a plurality of cells in series in a multistage manner.
  • the lithium ion battery 16 has a higher energy density and higher electromotive force than a lead acid battery or a nickel metal hydride battery, it is suitable for use in an EV or the like.
  • the switching element 17 is arranged in series with the lithium ion battery 16 on the main circuit, and the second IC 18 is connected to the switching element 17.
  • the switching element 17 constitutes switching means for switching between the main circuit and the second protection circuit.
  • the second protection circuit is arranged in parallel with the lithium ion battery 16, and is a bypass route in which one end is connected to the switching element 17 and the other end is connected between the second FET 14 and the lithium ion battery 16. is there.
  • an external output terminal 19 an LED (Light Emitting Diode) 20, and a heating resistor 21 are sequentially arranged in series.
  • the arrangement order is not particularly limited, but the external output terminal 19 is arranged in the immediate vicinity of the switching element 17.
  • the external output terminal 19 is a terminal connected to the outside of the battery pack 200, and outputs at least part of the current output on the second protection circuit to the outside as an error signal. Specifically, the external output terminal 19 is connected to the control unit 300 of the battery system 100 and functions as one of notification means for notifying the battery system 100 of an error of the battery pack 200.
  • the LED 20 is provided in an exterior portion (not shown) of the battery pack 200, and functions as a light emitting means that emits light when a current flows through the second protection circuit. Specifically, the LED 20 functions as a notification unit that notifies the abnormality of the battery pack 200 to the outside.
  • Various other lamps can be used as the light emitting means, but an LED that operates at low power and is low in cost as compared with other light emitting means is particularly preferable.
  • the LED 20 also functions as a part of the discharging means in the second protection circuit. That is, since power is consumed by light emission, the internal current of the battery pack 200 can be consumed, surplus power in the battery pack 200 is consumed, and the lithium ion battery 16 can be protected.
  • the heating resistor 21 functions as a part of the discharging means that consumes the current flowing through the second protection circuit due to heat generation.
  • the heating resistor 21 can consume the internal current of the battery pack 200, consume excess power in the battery pack 200, and protect the lithium ion battery 16.
  • the external output terminal 19, the LED 20, and the heating resistor 21 are arranged in series on the second protection circuit parallel to the lithium ion battery 16, but the order of these may be changed as appropriate. In addition, they may be arranged in parallel on the second protection circuit, respectively, and are appropriately changed within a range in which a notification function for notifying an error of the battery pack 200 and a discharge function for consuming excess power in the battery pack 200 can be maintained It goes without saying that is possible.
  • the battery pack 200 is connected to an overheat detection sensor 22 and an impact sensor 23.
  • the second IC 18 is connected to the overheat detection sensor 22 and the impact sensor 23, respectively.
  • the overheat detection sensor 22 may be a PTC (Positive Temperature Coefficient) thermistor, for example. Note that the overheat detection sensor 22 is preferably built in each battery pack 200 in order to detect overheating in the battery pack 200, but the description will proceed as a configuration that the battery system 100 has outside the battery pack 200.
  • PTC Physical Temperature Coefficient
  • an acceleration sensor can be used as the impact sensor 23.
  • the acceleration sensor it is possible to detect that the EV is in an accident such as a collision when the acceleration of the battery pack 200 exceeds a predetermined value.
  • the impact sensor 23 is preferably built in the battery pack 200 in order to detect an impact in the battery pack 200, but may be configured outside the battery pack 200 and included in the battery system 100.
  • control unit 300 may be incorporated into a part of the entire EV, for example, the control unit 300 may obtain a CAN (Controller Area Network) signal from a central control unit such as an ECU (Engine Control Unit) (not shown).
  • a central control unit such as an ECU (Engine Control Unit) (not shown).
  • the second IC 18 determines whether or not the internal temperature of the battery pack 200 is equal to or higher than a predetermined value by the overheat detection sensor 22. When the second IC 18 determines that the temperature is equal to or higher than the predetermined value, the second IC 18 is in an overheated state. In order to protect the switching element 17, the main circuit is shut off and the switching element 17 is controlled to switch to the second protection circuit.
  • the second IC 18 determines that a predetermined impact has been applied to the battery pack 200 by the impact sensor 23. For example, when the acceleration is determined to be greater than or equal to a predetermined value, an accident such as an accident has occurred. In order to protect the lithium ion battery 16, the switching element 17 is controlled so that the main circuit is shut off and switched to the second protection circuit.
  • the second IC 18 is connected to the heating detection sensor 22 and the impact sensor 23 so as to obtain information from these sensors.
  • the second IC 18 is connected to other sensors to protect the battery pack 200. It is also possible to input necessary information.
  • the second IC 18 is configured to receive at least one sensor information. Note that the configuration in which the second IC 18 controls the switching element 17 in a timely manner by the timer logic is not disturbed.
  • first IC 15 and the second IC 18 are described as separate bodies, they may be configured by one IC. In the case of a single IC, the number of parts can be reduced. On the other hand, when each IC is a separate body, the first protection circuit and the second protection circuit can be moved independently, and it is possible to provide redundancy of the protection function, so that it is safer. It becomes a battery pack in consideration.
  • the switching element 17 will be specifically described. As shown in FIGS. 2 and 4, the switching element 17 is a four-terminal element including a first terminal a, a second terminal b, a third terminal c, and a fourth terminal d.
  • the switching element 17 includes a heating resistor 31, a fusible conductor 32, and a switch 33 that are mounted in a plane on an insulating substrate (not shown).
  • the switching element 17 has a first terminal a connected to the positive electrode of the lithium ion battery 16, a second terminal b connected to the plus terminal 12 of the battery pack 200, and a third terminal c connected to the second IC 18.
  • the fourth terminal d is connected to the protection circuit.
  • one end of the heating resistor 31, one end of the fusible conductor 32, and one end of the switch 33 are connected to the first terminal a, and the fusible conductor is connected to the second terminal b.
  • the other end of 32 is connected.
  • the other end of the heating resistor 31 is connected to the third terminal c, and the other end of the switch 33 is connected to the fourth terminal d.
  • the switching element 17 has a circuit configuration as shown in FIGS. In other words, the switching element 17 is connected when the first terminal a and the second terminal b are normal, that is, when the first terminal a and the third terminal d are normal, they are insulated.
  • the switching element 17 constitutes a switch 33 that is short-circuited by the molten conductor when the soluble conductor 32 is melted by the heat generated by the heating resistor 31 (FIG. 4B).
  • the first terminal a and the fourth terminal d constitute both terminals of the switch 33.
  • the soluble conductor 32 is connected to the second electrode b.
  • the switching element 17 is incorporated in the battery pack 200 so that the first terminal a and the fourth terminal d on both sides of the switch 33 are in parallel with the main circuit of the battery pack 200.
  • the switch 20 is short-circuited to form a bypass current path (second protection circuit) that bypasses the battery pack 200.
  • the switching element 17 when an abnormality occurs in the lithium ion battery 16 or other electronic component connected in parallel, the switching element 17 is supplied with power from the third terminal c side of the heating resistor 31, and the heating resistor 31. Generates heat when energized. When the soluble conductor 32 is melted by this heat, the molten conductor is aggregated on the switch 33 as shown in FIG. As a result, the first electrode a and the fourth electrode d are short-circuited. That is, the switching element 17 is short-circuited between both terminals of the switch 33 (FIG. 4B).
  • the energization of the heating resistor 31 is detected by detecting the current flowing from the third terminal c because the main circuit is cut off and the current flows to the second protection circuit when the fusible conductor 32 is melted. It is preferable to stop the supply. This control can be controlled by the second IC 18.
  • the current output to the second protection circuit by the switching element 17 is output to the outside of the battery pack 200 as an error signal to be described later, and is used as a trigger for notifying the abnormality of the battery pack 200.
  • switching element 17 is not limited to the structure described above, and can be configured to selectively switch between the main circuit and the second protection circuit as appropriate.
  • the method using the two FETs described in the first protection circuit may be used.
  • the circuit configuration of the battery pack 200 in which the lithium ion battery 16 is built includes the first IC 15 that controls the operation of the lithium ion battery 16, the first FET 13 and the second FET 14, and the short-circuit element 17. And the current control element 41 and the second IC 18 for controlling the operation of the short-circuit element 17, the LED 20 and the heating resistor 21 on the protection circuit, and the positive terminal 11, the negative terminal 12, and the ground terminal 51 of the battery pack 200. Are connected to the control unit 300 via the control terminals 52 and 53 and the external terminal 19.
  • the battery pack 200 includes a first protection circuit 61 that controls charging / discharging of the lithium ion battery 16 and a current control element 41 that detects the voltage of the lithium ion battery 16 and controls the operation of the switching element 17.
  • a detection circuit for outputting an abnormal signal and a second protection circuit 62 connected to the lithium ion battery 16 by the switching element 17 are provided.
  • the first protection circuit 61 performs operations of the first FET 13 and the second FET 14 connected in series to the current path flowing from the control unit 300 to the lithium ion battery 16, and the operations of the first FET 13 and the second FET 14. And a first IC 15 to be controlled.
  • the switching element 17 is connected in series with the lithium ion battery 16, the second terminal b of the switching element 17 is connected to the charge / discharge path of the lithium ion battery 16, and the first terminal a is lithium.
  • the heating resistor 31 of the switching element 17 is connected to the current control element 41 via the third terminal c.
  • the first IC 15 is connected to the lithium ion battery 16 via the second IC 18, detects the voltage value of each battery cell, and the lithium ion battery 16 is overcharged or overdischarged. When the voltage is reached, the first IC 15 outputs an abnormal signal to the first FET 13 and the second FET 14. Note that the first IC 15 may be configured to directly detect the voltage value of the lithium ion battery 16.
  • the current control element 41 is, for example, an FET, and when the voltage value of the lithium ion battery 16 becomes a voltage exceeding a predetermined overdischarge or overcharge state due to the detection signal output from the second IC 18, the heating resistor The switch element operates so that a current flows to 31.
  • the current control element 41 blows the fusible conductor 32 by flowing a current to the heating resistor 31, operates the switching element 17 so that the switch 33 is turned on, and shuts off the lithium ion battery 16 and the main circuit.
  • a second protection circuit is connected.
  • the current control element 41 cuts off the charge / discharge current path of the lithium ion battery 16 regardless of the switching operation of the first FET 13 and the second FET 14 by the control from the second IC 18, and the switch 33 of the switching element 17. Can be controlled to bypass the main circuit and form the second protection circuit 62.
  • the switching element 17 heats and melts the soluble conductor 32 by the heating resistor 31, thereby blocking between the first terminal a and the second terminal b.
  • the lithium ion battery 16 having an abnormal battery cell can be shut off from the charge / discharge current path as the main circuit. Note that after the fusible conductor 32 is blown, the current control element 41 is moved under the control of the second IC 18 to stop the current from flowing, so that the power supply to the heating resistor 31 is stopped.
  • the switch 33 of the switching element 17 is connected, and the current of the lithium ion battery 16 flows to the second protection circuit 62. Accordingly, by turning on the LED 20 of the second protection circuit 62, it is possible to notify the abnormality of the battery pack 200, and it is possible to discharge the internal current by the heating resistor 21.
  • the external terminal 19 is connected to the second protection circuit 62, and at least part of the current flowing through the second protection circuit 62 is output to the control unit 300 as an error signal. ing.
  • the control unit 300 controls the battery pack 200 that has received the error signal to stop charging, and notifies the abnormality of the battery pack 200 by the notification unit 400.
  • the control unit 300 may monitor the error signal as a current value or a voltage value. That is, the current value of the current output from the external terminal 19 may be monitored, or the voltage value between the minus terminal 11 and the external terminal 19 may be monitored. The control unit 300 determines that an error signal has been received if the monitored current value or voltage value is equal to or greater than a predetermined value.
  • the predetermined value is preferably set appropriately to a value that excludes noise and the like.
  • the battery system 100 including a plurality of such battery packs 200 is configured to stop charging / discharging of the battery pack 200 even when an abnormality occurs in one battery pack 200, so that the remaining normal battery packs 200 The function can be maintained.
  • the battery pack 200 when the battery pack 200 satisfies a predetermined condition, an internal current is released and an error signal is emitted to the outside so that an error can be notified. Abnormalities of the battery pack 200 can be individually detected, and maintenance properties such as failure replacement of the battery pack 200 can be improved.
  • the failed battery pack 200 can be visually recognized by the light emission of the LED 20, and since an error signal is also output from each battery pack 200, it is easy to specify the failure location. . Thereby, a remarkable effect can be obtained particularly in an apparatus in which a large number of battery packs 200 are mounted, such as EVs, and the replacement of the battery pack 200 is required.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)
PCT/JP2015/063590 2014-05-13 2015-05-12 バッテリパック、バッテリシステム、及び放電方法 WO2015174398A1 (ja)

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KR1020167031339A KR102382961B1 (ko) 2014-05-13 2015-05-12 배터리 팩, 배터리 시스템 및 방전 방법
CN201580024838.7A CN106463947B (zh) 2014-05-13 2015-05-12 电池组、电池系统及放电方法

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JP2014099714A JP6277057B2 (ja) 2014-05-13 2014-05-13 バッテリパック、バッテリシステム、及び放電方法
JP2014-099714 2014-05-13

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