CN116349101A - Monitoring device for battery pack - Google Patents

Monitoring device for battery pack Download PDF

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Publication number
CN116349101A
CN116349101A CN202180068368.XA CN202180068368A CN116349101A CN 116349101 A CN116349101 A CN 116349101A CN 202180068368 A CN202180068368 A CN 202180068368A CN 116349101 A CN116349101 A CN 116349101A
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CN
China
Prior art keywords
power fuse
battery pack
voltage detection
detection line
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202180068368.XA
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Chinese (zh)
Inventor
村上高広
川岛裕宣
足立大海
本多健
山川亮
渡边日出光
榊原雅大
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Denso Corp
Original Assignee
Denso Corp
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Publication date
Application filed by Denso Corp filed Critical Denso Corp
Publication of CN116349101A publication Critical patent/CN116349101A/en
Pending legal-status Critical Current

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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • 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
    • H02H7/20—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 electronic equipment
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Protection Of Static Devices (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

A monitoring device (1) for a battery pack, wherein a first connector (21) provided on the battery pack (2) side is connected to a second connector (31) provided on the monitoring circuit (3) side, and the state of the battery pack (2) is monitored. The monitoring device (1) comprises: a first power fuse (22) provided in a first voltage detection line (L1) connecting the battery pack (2) to the first connector (21); and a second power fuse (32) provided in a second voltage detection line (L2) connecting the monitoring circuit (3) and the second connector (31). The rated current of the first power fuse (22) is set to be smaller than the rated current of the second power fuse (32).

Description

Monitoring device for battery pack
Citation of related application
The present application is based on patent application No. 2020-171059 filed in japan on 10/9 of 2020, the content of which is incorporated by reference in its entirety.
Technical Field
The present disclosure relates to a monitoring device of a battery pack.
Background
In an electric vehicle such as a hybrid vehicle or an electric vehicle, for example, a battery pack in which a plurality of single cells (battery cells) are connected in series is used as an electric power source, and electric power supplied from the electric power source is used to drive a travel drive motor. In the battery pack, the voltage of each cell is monitored by a monitoring circuit. For example, japanese patent application laid-open No. 2014-7883 (patent document 1) discloses a battery pack in which two terminals of each battery cell (unit cell) are connected to a monitoring circuit using a detection line for voltage detection, and the voltage of each unit cell is monitored. The detection line for voltage detection is provided with a fuse that cuts off the electrical connection between the battery pack and the monitoring circuit when a current equal to or higher than a predetermined current value flows. Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2014-7883
Disclosure of Invention
In patent document 1, a fuse is provided in a detection line (voltage detection line) for voltage detection to protect a monitoring circuit from an overvoltage generated in a battery pack. However, after a large current equal to or larger than a predetermined current value flows through the voltage detection line to melt the fuse, a high voltage may be applied to the melted fuse terminal. If a high voltage is applied to the fuse terminals after the fuse is broken, arc discharge may occur between the fuse terminals, and an arc current may be inputted to the monitor circuit.
In order to facilitate the installation of the monitoring circuit, the voltage detection line on the battery pack side may be connected to the voltage detection line on the monitoring circuit side via a connector. In this case, in order to improve the mountability to the electric vehicle, the distance between the connectors is often relatively small. Thus, the insulation distance between the adjacent connector terminals becomes relatively small. Therefore, if the potential difference between the adjacent connector terminals becomes large, arcing may occur between the connector terminals.
The present disclosure has been made to solve the above-described problems, and an object of the present disclosure is to provide a monitoring device for a battery pack, which can protect a monitoring circuit from an arc current generated after a fuse is blown, and can suppress occurrence of arc discharge between adjacent connector terminals.
The monitoring device for a battery pack according to the present disclosure is a monitoring device that connects a first connector provided on a battery pack side with a second connector provided on a monitoring circuit side and monitors a state of the battery pack, wherein the monitoring device for a battery pack includes a first power fuse provided on a first voltage detection line connecting the battery pack with the first connector and a second power fuse provided on a second voltage detection line connecting the monitoring circuit with the second connector. The rated current of the first power fuse is set smaller than the rated current of the second power fuse.
According to this configuration, the rated current of the first power fuse is set smaller than the rated current of the second power fuse. Therefore, if an overvoltage is generated in the battery pack and a large current flows in the first voltage detection line and the second voltage detection line, the first power fuse is blown earlier than the second power fuse, and the electrical connection of the battery pack and the first connector is cut off. Therefore, the electrical connection between the battery pack and the monitoring circuit is also cut off, and the monitoring circuit can be protected from the overvoltage generated in the battery pack.
After the first power fuse is blown, if a high voltage is applied to the terminal of the blown first power fuse, arc discharge may occur between the terminals of the blown first power fuse. In this way, a large current (arc current) flows through the second voltage detection line connecting the monitor circuit and the second connector. In this case, the second power fuse is blown by the arc current, and the electrical connection of the second connector to the monitor circuit is cut off. Therefore, the monitor circuit can be protected from the arc current.
In addition, since the first power fuse provided in the first voltage detection line connecting the battery pack to the first connector is first blown due to the overvoltage generated in the battery pack, and the electrical connection between the battery pack and the first connector is cut off, even if the insulation distance between the adjacent first connector terminals is small (short), the arc discharge between the adjacent first connectors can be suppressed.
According to the present disclosure, it is possible to provide a monitoring device for a battery pack that can protect a monitoring circuit from an arc current generated after a fuse is blown and suppress occurrence of arc discharge between adjacent connector terminals.
Drawings
Fig. 1 is an overall configuration diagram of a battery pack monitoring device according to an embodiment.
Fig. 2A is a diagram showing a case where the uppermost first power fuse in the monitoring device of the battery pack remains without being blown when an overvoltage occurs in the battery pack.
Fig. 2B is a diagram showing a case where arc discharge occurs in the first power fuse at the lowermost part in the monitoring device of the battery pack in the case where overvoltage occurs in the battery pack.
Fig. 3A is a diagram showing a state in which all the first power fuses in the monitoring device of the battery pack are blown when an overvoltage is generated in the battery pack.
Fig. 3B is a diagram showing a state in which the second power fuse at the lowermost part in the monitoring device of the battery pack is blown in the case where an overvoltage is generated in the battery pack.
Fig. 4 is an overall configuration diagram of a monitoring device for a battery pack according to modification 1.
Fig. 5 is an overall configuration diagram of a monitoring device for a battery pack according to modification 2.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and the description thereof will not be repeated.
Fig. 1 is an overall configuration diagram of a battery pack monitoring device 1 according to the present embodiment. The monitoring device 1 of the battery pack includes a power storage device 1A and a battery ECU (Electronic Control Unit: electronic control unit) 1B. The power storage device 1A includes, for example, a battery pack 2, a first connector 21, and a first power fuse 22. The battery ECU 1B includes, for example, a monitor circuit 3, a second connector 31, a second power fuse 32, a zener diode 33, a capacitor 34, and an inductor 35.
The battery pack 2 is an electric power source for driving a traveling drive motor of an electric vehicle such as a hybrid vehicle or an electric vehicle, and supplies electric power to the traveling drive motor via a PCU (Power Control Unit: electric power control unit), not shown. The battery pack 2 is formed by electrically connecting a plurality of unit cells (battery cells) 20 in series. The unit cell (battery cell) 20 is constituted by a secondary battery such as a lithium ion battery or a nickel metal hydride battery.
The monitor circuit 3 is a circuit for monitoring the voltage of the cell 20. The battery ECU includes, for example, a CPU (Central Processing Unit: central processing unit) and a memory (both not shown) in addition to the monitor circuit 3. The monitoring circuit 3 detects the voltage state of the cell 20 and the like, and outputs a signal indicating the detected voltage state of the cell 20 and the like to the CPU.
One end of a voltage detection line L1 is connected to an output terminal of each of the unit cells 20 constituting the battery pack 2. The other end of the voltage detection line L1 is connected to a first connector 21. A first power fuse 22 is provided on the voltage detection line L1. That is, the first power fuse 22 is provided between the single cell 20 and the first connector 21. When an overcurrent is generated in the battery pack 2 (the single cells 20) and a current (an overcurrent) equal to or greater than a first predetermined value flows through the voltage detection line L1, the first power fuse 22 is blown, and the electrical connection between the output terminal of the single cell 20 and the first connector 21 is cut off. The voltage detection line L1, the first connector 21, and the first power fuse 22 are mounted on a flexible printed circuit board (FPC: flexible Printed Circuits) 40. The FPC 40 is connected to the battery pack 2 (the single cells 20). The first power fuse 22 may be formed as a pattern fuse on the FPC 40, for example.
One end of the voltage detection line L2 is connected to the second connector 31, and the other end of the voltage detection line L2 is connected to the monitor circuit 3. By connecting the second connector 31 and the first connector 21, the voltage detection line L1 and the voltage detection line L2 are wired. A second power fuse 32 is provided on the voltage detection line L2. When a current (overcurrent) equal to or greater than a second predetermined value flows through the voltage detection line L2, the second power fuse 32 is blown, and the electrical connection between the second connector 31 and the monitor circuit 3 is cut off. The second power fuse 32 may be formed on a substrate or the like as a pattern fuse, for example.
The rated current of the first power fuse 22 provided in the voltage detection line L1 is set smaller than the rated current of the second power fuse 32 provided in the voltage detection line L2. That is, the magnitude of the current equal to or larger than the first predetermined value at which the first power fuse 22 can be fused is smaller than the magnitude of the current equal to or larger than the second predetermined value at which the second power fuse 32 can be fused.
A zener diode 33 is provided between the adjacent voltage detection lines L2. Of the pair of detection lines connected to the two terminals of the single cell 20, the cathode of the zener diode 33 is connected to the voltage detection line L2 connected to the positive terminal side of the single cell 20, and the anode of the zener diode 33 is connected to the voltage detection line L2 connected to the negative terminal side of the single cell 20. The pair of detection lines are a voltage detection line L1 and a voltage detection line L2 connected to the positive electrode terminal of the cell 20, and a voltage detection line L1 and a voltage detection line L2 connected to the negative electrode terminal of the cell 20. The breakdown voltage (voltage of the zener diode 33, japanese) is set to be smaller than the voltage at which the overvoltage occurs in the battery pack 2 (the battery cell 20), for example, to be several times the voltage at which the battery cell 20 is fully charged. Further, an inductor 35 is provided on the voltage detection line L2. In the present embodiment, the inductor 35 is provided between the second power fuse 32 and the monitor circuit 3. The inductor 35 constitutes an LC circuit together with the capacitor 34 connected between the adjacent voltage detection lines L2, and cuts off high-frequency noise. In addition, the capacitor 34 and the inductor 35 may be omitted. The voltage detection line L1 corresponds to an example of the "first voltage detection line" of the present disclosure. The voltage detection line L2 corresponds to an example of the "second voltage detection line" of the present disclosure.
In the monitoring device 1 of the assembled battery of the present embodiment configured as described above, for example, the bus bars connecting the cells 20 may be separated. The PCU includes a capacitor that smoothes the voltage VB from the battery pack 2 and supplies it to the step-up/step-down converter, and if the voltage of this capacitor is denoted as VL, an overvoltage of "the capacitor voltage VL of the PCU-the voltage VB of this cell" is generated between the voltage detection lines L1 of the two terminals of the cell 20 after the bus bar is disconnected.
Fig. 2A, 2B, 3A and 3B are diagrams showing the operation of the monitoring device 1 for the assembled battery in the case where an overvoltage occurs in the assembled battery 2. In fig. 2A, it is assumed that the connection between the cell 20-1 and the cell 20-2 is cut off at the position S due to the bus bar falling off or the like. If the connection between the cell 20-1 and the cell 20-2 is cut off, an overvoltage of "capacitor voltage VL of PCU-voltage Vb2 of the cell 20-2" is applied between the voltage detection line L1-1 connected to the negative terminal of the cell 20-1 and the voltage detection line L1-2 connected to the negative terminal of the cell 20-2. Accordingly, an overcurrent flows in the voltage detection line L1-1 connected to the negative terminal of the cell 20-1 and the voltage detection line L1-2 connected to the negative terminal of the cell 20-2. At this time, since the rated current of the first power fuse 22 is smaller than the rated current of the second power fuse 32, the first power fuse 22 is blown earlier than the second power fuse 32, and the electrical connection between the cell 20 and the first connector 21 is cut off. Therefore, the overcurrent can be suppressed from flowing to the monitor circuit 3 via the voltage detection line L1-1 and the voltage detection line L1-2. Since the first power fuse 22 is blown, the monitor circuit 3 can be protected from the overvoltage.
If the first power fuse 22 provided in the voltage detection line L1-1 connected to the negative electrode terminal of the cell 20-1 and the first power fuse 22 provided in the voltage detection line L1-2 connected to the negative electrode terminal of the cell 20-2 are blown, an overvoltage may occur between the cell 20-1 and the adjacent cell 20 (the cell on the positive electrode side of the cell 20-1) and between the cell 20-2 and the adjacent cell 20 (the cell on the negative electrode side of the cell 20-2), as indicated by an arrow AR1 in fig. 2A, the first power fuses 22 are sequentially blown. In this case, the frequency at which any one of the uppermost portion or the lowermost portion of the first power fuse 22 remains without being fused is high due to the characteristic deviation of the first power fuse 22. In fig. 2A, the first power fuse 22 at the uppermost portion is shown as not being fused and remaining.
As shown in fig. 2A, when the uppermost first power fuse 22 remains, a high voltage such as the voltage VB of the battery pack 2, the capacitor voltage VL of the PCU, or the system voltage VH of the PCU is applied to the voltage detection line L1 and the voltage detection line L2 via the uppermost first power fuse 22, depending on the form of the load (for example, PCU) connected to the battery pack 2, and the breakdown voltage of the zener diode 33 is exceeded. At this time, if the inter-terminal distance (inter-element distance) of the blown first power fuse is short, arc discharge may occur between the terminals (inter-elements) of the blown first power fuse 22. In fig. 2B, a case is shown in which arc discharge is generated between terminals of the first power fuse 22 at the lowest part of the blow.
As shown in fig. 2B, if arc discharge occurs between the terminals of the first power fuse 22 at the lowermost portion, an arc current flows as indicated by an arrow AR2, and the first power fuse 22 at the uppermost portion, which has a smaller rated current than the second power fuse 32, is blown. Thereby, the electrical connection between the battery pack 2 and the monitoring circuit 3 is cut off, and the monitoring circuit 3 is protected from the overvoltage. The zener diode 33 is configured to generate a short-circuit fault (short-circuit) when an overvoltage is applied.
Fig. 3A shows a state after all the first power fuses 22 provided in the voltage detection line L1 connected to the battery pack 2 are blown, and the monitor circuit 3 is protected from the overvoltage. Even in this state, depending on the form of the load connected to the battery pack 2, a high voltage such as the voltage VB of the battery pack 2, the capacitor voltage VL of the PCU, or the system voltage VH of the PCU may be applied to the terminal of the blown first power fuse 22. If a high voltage is applied to the terminals of the blown first power fuse 22, arc discharge may occur between the terminals of the portion where the inter-terminal distance of the blown first power fuse is short. For example, when the inter-terminal distance of the first power fuse 22 at the lowermost portion is short, as shown in fig. 3B, arc discharge occurs between the terminals of the first power fuse 22, and an arc current flows through the voltage detection line L2 (arrow AR 3). When the arc current flows, the second power fuse 32 of the voltage detection line L2 provided at the lowermost portion is blown, and the electrical connection between the second connector 31 and the monitor circuit 3 is cut off. This can suppress the flow of arc current through the monitor circuit 3.
Next, for example, when the inter-terminal distance of the first power fuse 22 of the second layer is short from the upper layer, as shown in fig. 3B, arc discharge occurs between the terminals of the first power fuse 22, and an arc current flows through the voltage detection line L2 (arrow AR 4). When the arc current flows, the second power fuse 32 provided in the voltage detection line L2 of the second layer is blown, and the electrical connection between the second connector 31 and the monitor circuit 3 is cut off. This can suppress the flow of arc current through the monitor circuit 3.
In this way, if arc discharge occurs between the terminals of the first power fuse 22, the corresponding second power fuse 32 is sequentially blown, and the electrical connection between the second connector 31 and the monitor circuit 3 is cut off, based on the relationship between the inter-terminal distance of the first power fuse 22 after the interruption and the high voltage applied to the terminals of the first power fuse 22, thereby protecting the monitor circuit 3 from the arc current.
If both the first power fuse 22 and the second power fuse 32 are blown, the distance between the terminal of the blown first power fuse 22 and the terminal of the blown second power fuse 32 becomes an insulation distance. By providing two fuses, the first power fuse 22 and the second power fuse 32, in the detection lines (the voltage detection line L1 and the voltage detection line L2), it is possible to ensure a large insulation distance when the fuses are blown. By securing a large insulation distance, the occurrence of arc discharge can be suppressed.
Due to the overvoltage generated in the battery pack 2 (the single cells 20), if the second power fuse 32 provided in the voltage detection line L2 is blown first, a high voltage may be applied to the first connector 21 via the first power fuse 22 that is not blown. In this way, when the insulation distance between the terminals of the adjacent first connectors 21 is small (short), arcing may occur between the adjacent first connectors 21. In the present embodiment, the first power fuse 22 of the voltage detection line L1 provided between the battery pack 2 and the first connector 21 is blown earlier than the second power fuse 32. Thereby, the electrical connection between the battery pack 2 (the single cells 20) and the first connector 21 is cut off. By cutting off the electrical connection between the battery pack 2 (the single cells 20) and the first connectors 21, even if the insulation distance between the terminals of adjacent first connectors 21 is small (short), the occurrence of arc discharge between the adjacent first connectors 21 can be suppressed.
In the present embodiment, the first power fuse 22 is mounted on the FPC 40 connected to the battery pack 2. The second power fuse 32 is provided in a voltage detection line L2 connecting the second connector 31 and the monitor circuit 3. If the second power fuse 32 is mounted on the FPC 40 in addition to the first power fuse 22, an area where the second power fuse 32 is mounted is required, and thus, the build of the FPC 40 needs to be increased. In addition, in order to perform the waterproof treatment, it is necessary to perform the potting treatment of the second power fuse 32, resulting in an increase in cost. In the present embodiment, since the second power fuse 32 is provided on the voltage detection line L2 and the first power fuse 22 is provided on the FPC 40, downsizing of the FPC 40 and suppression of an increase in cost can be achieved.
In the description of the present embodiment, the case where the uppermost first power fuse 22 remains without being blown as shown in fig. 2A when the overvoltage is generated in the battery pack 2 has been described, but the case where all the first power fuses 22 are blown and the state shown in fig. 3A is also described.
In the present embodiment, the description has been given of an example in which one battery pack 2 (battery block) is included in the power storage device 1A, but a plurality of battery packs 2 (battery blocks) may be included in the power storage device 1A. In this case, for example, the monitoring circuit 3 may be provided for each of the series-connected battery packs 2 (battery blocks).
Modification 1
Fig. 4 is an overall configuration diagram of a battery pack monitoring apparatus 10 according to modification 1. In modification 1, a third power fuse 36 is provided in series with the second power fuse 32 on the voltage detection line L2. The third power fuse 36 is disposed between the second power fuse 32 and the inductor 35. The configuration of the monitoring device 10 in which the battery pack other than the third power fuse 36 is added to the voltage detection line L2 is the same as that of the monitoring device 1 for the battery pack of the embodiment, and therefore, the description thereof will not be repeated.
The rated current of the third power fuse 36 is set to be the same as the rated current of the second power fuse 32. The rated current of the first power fuse 22 is set to be smaller than the rated currents of the second power fuse 32 and the third power fuse 36. In modification 1, as in the embodiment, when an overvoltage occurs in the battery pack 2 (the single cell 20), the rated current of the first power fuse 22 is set smaller than the rated currents of the second power fuse 32 and the third power fuse 36, and the first power fuse 22 is blown earlier than the second power fuse 32 and the third power fuse 36. Thereby, the electrical connection between the single cell 20 and the first connector 21 is cut off. Therefore, the electrical connection between the cell 20 and the monitoring circuit 3 is also cut off. By the blowing of the first power fuse 22, the monitor circuit 3 can be protected from the overvoltage.
If a high voltage is applied to the terminals of the blown first power fuse 22, arc discharge may occur between the terminals in the first power fuse having a short inter-terminal distance. If an arc discharge occurs between the terminals of the blown first power fuse 22, an arc current may flow through the voltage detection line L2. Thus, the second power fuse 32 and the third power fuse 36 are sequentially blown, and the electrical connection between the second connector 31 and the monitor circuit 3 is cut off. This can protect the monitor circuit 3 from the arc current. In modification 1, if the first, second, and third power fuses 22, 32, and 36 are blown, the inter-terminal distance between the blown power fuses can be increased by an amount equivalent to that of the third power fuse 36, as compared with the embodiment. That is, the insulation distance between the power fuse terminals can be increased. Therefore, arcing between terminals of the blown power fuse can be suppressed, and the monitor circuit 3 can be protected from the arc current.
In modification 1, the rated current of the third power fuse 36 is made the same as the rated current of the second power fuse 32, but may be different from the second power fuse 32 as long as the rated current of the third power fuse 36 is larger than the rated current of the first power fuse 22. In addition, three or more power fuses having a rated current greater than that of the first power fuse 22 may be provided in series to the voltage detection line L2. This can further lengthen the inter-terminal distance between the blown power fuses, and can ensure a larger insulation distance.
Modification 2
Fig. 5 is an overall configuration diagram of a battery pack monitoring apparatus 11 according to modification 2. In modification 2, a fourth power fuse 23 is provided in series with the first power fuse 22 on the voltage detection line L1. The fourth power fuse 23 is provided to the voltage detection line L1, and is provided between the first power fuse 22 and the first connector 21. The voltage detection line L1, the first connector 21, the first power fuse 22, and the fourth power fuse 23 are mounted to the FPC 40. The first and fourth power fuses 22 and 23 may also be formed as pattern fuses on the FPC 40. The configuration of the monitoring device 11 in which the battery pack other than the fourth power fuse 23 is added to the voltage detection line L1 is the same as that of the monitoring device 1 for the battery pack of the embodiment, and therefore, the description thereof will not be repeated.
The rated current of the fourth power fuse 23 is set to be the same as the rated current of the first power fuse 22 or set to be smaller than the rated current of the first power fuse 22. In modification 2, as in the embodiment, when an overvoltage occurs in the battery pack 2 (the single cell 20), the rated current of the first power fuse 22 and the rated current of the fourth power fuse 23 are set to be smaller than the rated current of the second power fuse 32, whereby the first power fuse 22 and the fourth power fuse 23 are blown earlier than the second power fuse 32. Thereby, the electrical connection between the single cell 20 and the first connector 21 is cut off. Therefore, the electrical connection between the cell 20 and the monitoring circuit 3 is also cut off. By the blowing of the first power fuse 22 and/or the fourth power fuse 23, the monitor circuit 3 can be protected from the overvoltage.
Further, three or more power fuses having a smaller rated current than the second power fuse 32 may be provided in series on the voltage detection line L1. This can further lengthen the inter-terminal distance between the blown power fuses, and can ensure a larger insulation distance.
(other modifications)
In the embodiment, an example in which the first power fuses 22 are provided on the voltage detection lines L1, respectively, is described. For example, the first power fuse 22 may be omitted from one of the voltage detection lines L1. In this case, the overcurrent can be suppressed from flowing through the monitor circuit 3 by the fusing of the first power fuse 22 provided in the voltage detection line L1 other than the one voltage detection line L1. By the above, the number of the first power fuses 22 can be reduced.
On the condition that the rated current is smaller than the rated current of the second power fuse 32, a plurality of first power fuses 22 may be provided in parallel on the voltage detection line L1.
Embodiments in the present disclosure are exemplified, and the following modes can be exemplified.
(I) A monitoring device (1) for a battery pack (2) is provided, wherein a first connector (21) provided on the battery pack (2) side is connected to a second connector (31) provided on the monitoring circuit (3) side, and the state of the battery pack (2) is monitored, wherein the monitoring device for the battery pack comprises a first power fuse (22) provided on a first voltage detection line (L1) connecting the battery pack (2) to the first connector (21), and a second power fuse (32) provided on a second voltage detection line (L2) connecting the monitoring circuit (3) to the second connector (31), and the rated current of the first power fuse (22) is set to be smaller than the rated current of the second power fuse (32).
In the above I, the first voltage detection line (L1) and the first power fuse (22) are mounted on a flexible printed board (40) connected to the battery pack (2).
According to this structure, the first power fuse is mounted to the FPC, and the second power fuse is provided to the second voltage detection line. The configuration (mounting area) of the FPC can be made smaller than that in the case where the first and second power fuses are mounted on the FPC.
In the above I or II, a third power fuse (36) is provided in series with the second power fuse (32) on the second voltage detection line (L2), and the rated current of the third power fuse (36) is larger than the rated current of the first power fuse (22).
According to this configuration, the inter-terminal distance between the blown power fuses can be increased, and the insulation distance between the power fuse terminals can be increased, so that arcing between the terminals of the blown power fuses can be suppressed, and the monitoring circuit can be protected from the arc current.
In the above I-III, the battery pack (2) is formed by electrically connecting a plurality of single cells (20) in series, and the first voltage detection line (L1) is connected to the output terminal of each single cell (20).
It should be understood that all points of the embodiments disclosed herein are illustrative and not limiting. The scope of the present disclosure is shown by the claims rather than the description of the embodiments described above, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

Claims (1)

1. A monitoring device for a battery pack is provided,
the monitoring device of the battery pack connects a first connector provided on a battery pack side with a second connector provided on a monitoring circuit side, and monitors a state of the battery pack, wherein the monitoring device of the battery pack includes:
a first power fuse provided to a first voltage detection line connecting the battery pack and the first connector; and
a second power fuse provided in a second voltage detection line connecting the monitor circuit and the second connector,
the rated current of the first power fuse is set smaller than the rated current of the second power fuse.
CN202180068368.XA 2020-10-09 2021-09-06 Monitoring device for battery pack Pending CN116349101A (en)

Applications Claiming Priority (3)

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JP2020171059A JP7509648B2 (en) 2020-10-09 2020-10-09 Battery pack monitoring device
JP2020-171059 2020-10-09
PCT/JP2021/032663 WO2022074985A1 (en) 2020-10-09 2021-09-06 Monitoring device for assembled battery

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CN116349101A true CN116349101A (en) 2023-06-27

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JP4626809B2 (en) 2005-08-03 2011-02-09 横河電機株式会社 Overvoltage protection circuit
JP2014235997A (en) 2013-06-05 2014-12-15 パナソニックＩｐマネジメント株式会社 Shut-off device and power conversion system
JP5861688B2 (en) 2013-11-14 2016-02-16 トヨタ自動車株式会社 Charging / discharging system and vehicle used therefor
JP2016134962A (en) 2015-01-16 2016-07-25 トヨタ自動車株式会社 Power storage system
JP6477403B2 (en) 2015-10-13 2019-03-06 株式会社デンソー Circuit protection device
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JP7509648B2 (en) 2024-07-02

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