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EP-4131719-B1 - POWER STORAGE PACK, ELECTRIC MOVING BODY, CHARGING DEVICE

EP4131719B1EP 4131719 B1EP4131719 B1EP 4131719B1EP-4131719-B1

Inventors

  • KURANUKI, MASAAKI
  • HAMAMOTO, KATSUAKI
  • NAGASE, Ryosuke

Dates

Publication Date
20260506
Application Date
20210318

Claims (8)

  1. A power storage pack (10) comprising: a power storage unit (11) for supplying power to an electric moving body (30); a power line (Lp1) connecting between the power storage unit (11) and a power source terminal (Tp) for charging and discharging; a first switch (RYp) inserted into the power line (Lp1); a controller (12) that communicates with a controller (32) of the electric moving body (30) in a state where the power storage pack (10) is mounted to the electric moving body (30) or communicate with a controller (22) of a charging device (20) in a state where the power storage pack (10) is mounted to a charging slot (SLc1) of the charging device (20); a communication wiring (Lc1) that connects between a node of the power line (Lp1) closer to the power source terminal (Tp) relative to the first switch (RYp) and the controller (12) of the power storage pack (10); a second switch (SWc) inserted into the communication wiring (Lc1); and an overvoltage protection circuit (19) that protects the controller (12) of the power storage pack (10) from overvoltage, wherein the controller (12) of the power storage pack (10) that performs communication with the controller (32) of the electric moving body (30) or the controller (22) of the charging device (20) using the power line (Lp1) and the communication wiring (Lc1), the controller (12) of the power storage pack (10) causing the first switch (RYp) to be turned off and the second switch (SWc) to be turned on, and the overvoltage protection circuit (19) turns off the second switch (SWc1) upon detecting an overvoltage of the power line (Lp1) during communication between the controller (12) of the power storage pack (10) and the controller (32) of the electric moving body (30) or the controller (22) of the charging device (20).
  2. The power storage pack (10) according to Claim 1, wherein the overvoltage protection circuit (19) includes a voltage dividing resistor (R1; R2) for detecting a voltage of the node of the power line (Lp1), and a third switch (Q3) that turns on the second switch (SWc) when a divided voltage of the voltage dividing resistor (R1; R2) exceeds a threshold voltage.
  3. The power storage pack (10) according to Claim 2, wherein the second switch (SWc) and the third switch (Q3) are PNP transistors, the voltage dividing resistor (R1; R2) is connected between a positive wiring and a negative wiring of the power line (Lp1), an emitter of the third switch (Q3) is connected to the positive wiring of the power line (Lp1), a collector of the third switch (Q3) is connected to the negative wiring of the power line (Lp1) via a resistor (R3), and a base of the third switch (Q3) is connected to a voltage dividing point of the voltage dividing resistor (R1; R2), and an emitter of the second switch (SWc) is connected to the positive wiring of the power line (Lp1), a collector of the second switch (SWc) is connected to the controller (12) of the power storage pack (10), and a base of the second switch (SWc) is connected to the collector of the third switch (Q3).
  4. The power storage pack according to any one of Claims 1 to 3, wherein upon receiving identification information from the controller (32) of the electric moving body (30) or the controller (22) of the charging device (20) via the power line (Lp1) and the communication wiring (Lc1), the controller (12) of the power storage pack (10) transmits a signal including the identification information by near-field communication, and a signal transmitted in the near-field communication is used by the controller (32) of the electric moving body (30) or the controller (22) of the charging device (20) to authenticate whether or not the power storage pack (10) mounted into the electric moving body (30) or the charging slot (SLc1) and a communication partner of the near-field communication are identical.
  5. An electric moving body (30) comprising: a motor (311); a power line (Lpa) that connects between the motor (311) and a power source terminal (Tp) that receives power supply from an outside; a first switch (RYsa) inserted into the power line (Lpa); a controller (32) that communicates with a controller (12) of a power storage pack (10) in a state where the power storage pack (10) for supplying power to the motor (311) is mounted to the electric moving body (30); a communication wiring (Lca) that connects between a node of the power line (Lpa) closer to the power source terminal (Tp) relative to the first switch (RYsa) and the controller (32) of the electric moving body (30); a second switch (SWca) inserted into the communication wiring (Lca); and an overvoltage protection circuit (39a) that protects the controller (32) of the electric moving body (30) from overvoltage, wherein the controller (32) of the electric moving body (30) that performs communication with the controller (12) of the power storage pack (10) using the power line (Lpa) and the communication wiring (Lca), the controller (32) of the electric moving body (30) causing the first switch (RYsa) to be turned off and the second switch (SWca) to be turned on, and the overvoltage protection circuit (39a) turns off the second switch (SWca) upon detecting an overvoltage of the power line (Lpa) during communication between the controller (32) of the electric moving body (30) and the controller (12) of the power storage pack (10).
  6. The electric moving body (30) according to Claim 5, wherein the controller (32) of the electric moving body (20) transmits identification information to the controller (12) of the power storage pack (10) via the power line (Lpa) and the communication wiring (Lca) when the power storage pack (10) is mounted to the electric moving body (30), and collates whether or not identification information included in a received signal matches the transmitted identification information when receiving a signal transmitted by near-field communication, and authenticates that the power storage pack (10) mounted to the electric moving body (30) and a communication partner of the near-field communication are identical when the identification information included in the received signal matches the transmitted identification information.
  7. A charging device (20) comprising: a charging slot (SLc1); a power line (Lpa) that connects between a charging source (29) and a power source terminal (Tp) of the charging slot (SLc1); a power line (Lpa) that connects between the charging slot (SLc1) and a charging source (29); a first switch (RYsa) inserted into the power line (Lpa); a controller (22) that communicates with a controller (12) of a power storage pack (10) in a state where the power storage pack (10) is mounted into the charging slot (SLc1); a communication wiring (Lca) that connects between a node of the power line (Lpa) closer to the power source terminal (Tp) relative to the first switch (RYsa) and the controller (22) of the charging device (20); a second switch (SWca) inserted into the communication wiring (Lca); and an overvoltage protection circuit (39a) that protects a controller (22) of the charging device (20) from overvoltage, wherein the controller (22) of the charging device (20) performs communication with the controller (12) of the power storage pack (10) using the power line (Lpa) and the communication wiring (Lca), the controller (22) of the charging device (20) causing the first switch (RYsa) to be turned off and the second switch (SWca) to be turned on, and the overvoltage protection circuit (39a) turns off the second switch (SWca) upon detecting an overvoltage of the power line (Lpa) during communication between the controller (22) of the charging device (20) and the controller (12) of the power storage pack (10).
  8. The charging device (20) according to Claim 7, wherein the controller (22) of the charging device (20) transmits identification information to the controller (12) of the power storage pack (10) via the power line (Lpa) and the communication wiring (Lca) when the power storage pack (10) is mounted to the charging slot (SLc1), and receives a signal transmitted by near-field communication to collate whether or not identification information included in the signal received matches the identification information transmitted, and authenticates that the power storage pack (10) mounted to the charging slot (SLc1) and a communication partner of the near-field communication are identical when the identification information included in the signal received matches the identification information transmitted.

Description

TECHNICAL FIELD The present disclosure relates to a power storage pack capable of being mounted to and unmounted from an electric moving body, an electric moving body, and a charging device. BACKGROUND ART In recent years, electric motorcycles (electric scooters) and electric bicycles have become widespread. Usually, a portable battery pack capable of being mounted and unmounted is used in the electric motorcycle or the electric bicycle. When a battery is used as a power source of the motorcycle (scooter), a time required for energy supply is longer than that in a case where a liquid fuel such as gasoline is used (a charging time is longer than a fueling time). Then, it is considered to construct a mechanism for shortening the time required for energy supply by exchanging a battery pack charged in advance with a battery pack having reduced remaining capacity at the nearest charging stand when the remaining capacity of the battery pack decreases. In order to reduce the number of terminals of the battery pack, it is conceivable to transmit and receive control signals between the battery pack and the vehicle or the charger by wireless communication. In the above mechanism involving exchange of the battery pack, when a battery pack that transmits and receives control signals by wireless communication is used, a circumstance where a plurality of vehicles or a plurality of chargers exist in a range where wireless communication with the battery pack is possible can occur. Under such a circumstance, there is a possibility that a controller of a certain vehicle erroneously controls a battery pack mounted into another adjacent vehicle. There is a possibility that a controller of a charger does not control a battery pack that is supposed to be controlled and is mounted into a certain charging slot but erroneously controls a battery pack that is not supposed to be controlled and is mounted into another charging slot. In such a case, safety and security of the entire charging system cannot be secured. Therefore, the inventors of the present invention have developed a method of correctly identifying a battery pack mounted to a vehicle or a charging device by transmitting identification information from the vehicle or the charging device to the battery pack via a power line, and looping back the identification information from the battery pack to the vehicle or the charging device by wireless communication. In this method, when the identification information is transmitted via the power line, the power line and the high-voltage unit are interrupted, and the power line is used as a low-voltage signal line. PTL 1 discloses a method of suppressing consumption of a battery by making a voltage dividing resistor of an overvoltage protection circuit that monitors the battery separable by a switch. This overvoltage protection circuit protects the battery so as not to apply an overvoltage to the battery, and does not protect a low-voltage controlling circuit from a high-voltage unit in a state where a power line interrupted from the high-voltage unit such as the battery is used as a low-voltage signal line. Citation List Patent Literature PTL 1: Unexamined Japanese Patent Publication No. 2000-152510 SUMMARY OF THE INVENTION The present disclosure has been made in view of such a circumstance, and an object of the present disclosure is to provide a technique for safely performing communication using a power line between a power storage pack and an electric moving body or a charging device. In order to solve the above problems, a power storage pack of an aspect of the present disclosure includes: a power storage unit for supplying power to an electric moving body; a power line connecting between the power storage unit and a power source terminal for charging and discharging; a first switch inserted into the power line; a controller that communicates with a controller of the electric moving body in a state where the power storage pack is mounted to the electric moving body or communicate with a controller of a charging device in a state where the power storage pack is mounted to a charging slot of the charging device; a communication wiring that connects between a node of the power line on the power source terminal side relative to the first switch and the controller of the power storage pack; a second switch inserted into the communication wiring; and an overvoltage protection circuit that protects a controller of the power storage pack from overvoltage. A controller of the power storage pack controls the first switch to be turned off and the second switch to be turned on when performing communication with a controller of the electric moving body or a controller of the charging device using the power line and the communication wiring, and the overvoltage protection circuit turns off the second switch when detecting an overvoltage of the power line during communication between a controller of the power storage pack and a controller of