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KR-102961987-B1 - OVER-DISCHARGE PROTECTION APPARATUS FOR SUPPLEMENTARY BATTERY OF ELECTRIC MOTOCYCLE

KR102961987B1KR 102961987 B1KR102961987 B1KR 102961987B1KR-102961987-B1

Abstract

The present invention relates to an over-discharge prevention device and method for an auxiliary battery of an electric two-wheeled vehicle, which checks the charge status of the auxiliary battery when the auxiliary battery is operating in sleep mode to prevent over-discharge. The present invention for implementing this is an over-discharge prevention device for an auxiliary battery of an electric two-wheeled vehicle, comprising a main battery that supplies power to electric drive components constituting the electric two-wheeled vehicle, an auxiliary battery that supplies driving power to the main battery to drive a main battery controller so that the main battery can supply power to the electric drive components when the key set is connected in an ON state, wherein the auxiliary battery is equipped with an SOC value detection unit that detects the SOC value of the auxiliary battery and an auxiliary battery control unit that controls the output of the auxiliary battery according to the SOC value, wherein the auxiliary battery control unit compares the SOC value received from the SOC value detection unit in the auxiliary battery constant discharge mode with a predetermined value set for over-discharge prevention, and if the SOC value falls below the predetermined value, operates the auxiliary battery in a sleep mode, while, when the ignition key is connected in an ON state through the key set, the auxiliary battery is woke up to charge the auxiliary battery.

Inventors

  • 최아름

Assignees

  • 디앤에이모터스 주식회사

Dates

Publication Date
20260508
Application Date
20230801
Priority Date
20221004

Claims (4)

  1. An over-discharge prevention device for an auxiliary battery of an electric two-wheeled vehicle, comprising a main battery that supplies driving power to an electric two-wheeled vehicle, an auxiliary battery for supplying operating power and temporary power to the main battery, and a key set that switches to an on or off state to turn on or off the ignition of the electric two-wheeled vehicle, A battery box in which the main battery is stored so as to be detachably replaceable and the space in which the main battery is stored can be opened and closed by a locking member; and The above auxiliary battery is provided below the seat and installed in a storage space that is opened and closed by the seat, and the space in which the above auxiliary battery is stored can be opened and closed by a locking member of the seat; the auxiliary battery storage section is provided. The above key set is activated by power supplied from the auxiliary battery to select an operation mode, and switches the power supplied from the auxiliary battery according to the switching state of the key set, thereby including a battery box switch that unlocks the locking member of the battery box for the mounting space of the main battery, and a seat switch that unlocks the locking member of the seat for sealing or opening the auxiliary battery storage compartment, and is configured to control the VCU so as to supply power from the main battery to each electric drive member when the key is turned on. The above auxiliary battery is equipped with an SOC value detection unit that detects the SOC value of the auxiliary battery and an auxiliary battery control unit that controls the output of the auxiliary battery according to the SOC value. The above auxiliary battery control unit operates the auxiliary battery in a constant discharge mode when the key set is turned off, thereby supplying power to the vehicle control unit and the warning sound generator even if the main battery is removed, and compares the SOC value received from the SOC value detection unit with an over-discharge reference value set for preventing over-discharge, and if it falls below the over-discharge reference value, operates the auxiliary battery in a sleep mode, while when the key set is connected in an ON state by a mechanical ignition key, it wakes up the auxiliary battery to operate it in a chargeable state, and if charging power is not supplied within a predetermined time, it controls the auxiliary battery back to a sleep mode to cut off discharge, thereby enabling the warning sound generator to operate even in the absence of the main battery and extending the usable time of the auxiliary battery to stably manage the electric two-wheeled vehicle. This characterizes an over-discharge prevention device for an electric two-wheeled vehicle auxiliary battery.
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Description

Over-discharge protection apparatus for a supplementary battery of an electric motorcycle and method thereof The present invention relates to an over-discharge prevention device and method for an electric two-wheeled vehicle auxiliary battery, and more specifically, to an over-discharge prevention device and method for an electric two-wheeled vehicle auxiliary battery that checks the charge status of the auxiliary battery when the auxiliary battery is operating in sleep mode to prevent over-discharge and extend the usage time of the main battery. Due to recent environmental concerns, modes of transportation such as electric vehicles, which do not emit greenhouse gases unlike internal combustion engine vehicles powered by gasoline or diesel, are becoming popularized, and electric motorcycles are also being developed as one of these options. Electric two-wheeled vehicles are equipped with a battery to supply electricity to the motor and generate rotational power. Batteries are installed in either an integrated or a replaceable type. In the case of the replaceable type, charging methods include swapping with a charged battery, disconnecting and charging the battery, or charging via direct connection. However, if the battery is disconnected to charge it, the vehicle will be without the battery, making it difficult to respond to theft, falls, or emergencies. Accordingly, auxiliary batteries are applied to electric motorcycles to prevent dangerous situations and manage the vehicle stably. Typically, the auxiliary battery performs functions such as supplying power to the VCU (Vehicle Control Unit) and AVAS (Acoustic Vehicle Alerting System) to detect external impacts, issue vehicle warnings, and respond to falls or theft; supplying power to the main battery controller for turning the key on; and supplying power to the keyset for key-on operation. However, after the main battery is discharged or after a long time has passed since it was removed for replacement, the auxiliary battery may become over-discharged and its SOC may drop to 0%. In such cases, the battery box must be opened to install the main battery, but since the battery box can only be opened when power is supplied from the auxiliary battery, there was an inconvenience in having to disassemble the vehicle to replace the auxiliary battery, open the battery box, and install the main battery. In addition, in conventional electric two-wheeled vehicles, even when the key set is turned off, the main battery is not turned off and continues to supply power to all systems of the vehicle, so the main battery discharges severely. For example, if left unused for about 16 days, 40% of the main battery is discharged, and there is a problem that the time until it is completely discharged becomes shorter. As such, if the auxiliary battery in an electric two-wheeled vehicle is over-discharged and fails to supply power to the VCU, AVAS, and key set, the key set does not work, making it impossible to operate the electric two-wheeled vehicle stably and causing inconvenience. Additionally, the discharge time of the main battery and auxiliary battery is short, and batteries that are over-discharged due to carelessness during use are permanently damaged and become a cause of defects. FIG. 1 is a configuration diagram of the present invention, FIG. 2 is an installation diagram of a main battery and an auxiliary battery according to the present invention, FIG. 3 shows a flowchart for explaining a method to prevent over-discharge of an electric two-wheeled vehicle auxiliary battery according to the present invention. It should be understood that the present invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. In this application, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Figure 1 shows a configuration diagram of an over-discharge prevention device for an electric two-wheeled vehicle auxiliary battery according to the present invention. As shown in FIG. 1, the electric two-wheeled vehicle is equipped with an auxiliary battery unit (10) and a main battery (60), and the auxiliary battery unit (10) is connected to a key set (20), a main battery controller (30), an AVAS (