Power management system of agricultural electric working vehicle and relay control method

Abstract

The present invention relates to a relay control technology of an agricultural electric working vehicle. A power management system for an agricultural electric working vehicle, according to the present invention, comprises: a first relay module provided in a battery pack; a second relay module provided in a power distributor; and a general controller controlling the second relay module to be turned off and then the first relay module to be turned off when the power management system is switched to a power off state by a key off command or a failure. According to the present invention, damage to the first relay module in the battery pack is suppressed, thereby minimizing the repair of the battery pack.

Description

Power management system and relay control method for agricultural electric work vehicles

[0001] The present invention relates to a power management technology for an electric tractor, and more particularly to a technology for protecting a relay module in a battery pack.

[0002] Advances in battery technology are rapidly replacing internal combustion engines as the power source for mobile devices.

[0003] Recently, efforts are being made to use batteries as a power source not only for electric vehicles but also for agricultural work vehicles such as farm tractors and combine harvesters. Several types of agricultural tractors have already reached commercialization.

[0004] Unlike electric vehicles, agricultural work vehicles frequently operate on rough terrain and in wetlands. Batteries, on the other hand, are vulnerable to impacts and water damage. Therefore, a reliable battery protection structure is particularly important when using batteries as a power source for agricultural work vehicles.

[0005] In particular, unlike conventional vehicles, agricultural work vehicles cannot have a separate structure to block water splashing up from the ground near the power source. Therefore, water splashing from the ground during operation can continuously attack the battery, making battery waterproofing a critical issue in agricultural work vehicles.

[0006] Figure 1 shows an example of a power management system (100) that can be applied to an agricultural electric work vehicle.

[0007] The power management system (100) may be composed of a battery pack (110) and a power distributor (120).

[0008] The battery pack (110) includes a battery module (111) and a relay module (112) inside.

[0009] The battery module (111) functions as a power source that outputs stored electric energy to provide driving force (electricity).

[0010] The relay module (112) is commonly abbreviated as PRA (Power Relay Assembly), and protects the battery module (111) and electrical components (141, 142, 143) by controlling the power output from the battery module (111) between the battery module (111) and the power distributor (120). The relay module (112) is an assembly of relays, and essentially operates when the power is turned on / off, connecting or cutting off the power from the battery module (111) to the power distributor (120). Here, on means that the power is connected, and off means that the power is cut off, and they are used with the same meaning hereinafter.

[0011] The power distributor (120) is placed between the relay module (112) and various electrical components (141, 142, 143), and appropriately distributes the power of the battery to the various electrical components (141, 142, 143). Here, the various electrical components (141, 142, 143) function as loads that operate while consuming power. That is, the electric energy stored in the battery module (111) is mainly consumed by the electrical components (141, 142, 143).

[0012] Meanwhile, high-voltage power is required to operate agricultural power vehicles. Consequently, relays can become damaged during the high-voltage connection and disconnection process. Therefore, relays in agricultural power vehicles are consumables that frequently require replacement.

[0013] Additionally, if the relay is tripped due to a system failure or other reason while high-voltage current is flowing, sparks will occur at the contacts. If this phenomenon occurs frequently, the relay will seize. Therefore, even in this case, relay replacement is necessary.

[0014] However, in order to repair the relay module (112) or replace the relay, it is necessary to remove the completely sealed battery cover. After the repair or replacement is completed, the battery cover must be reattached.

[0015] However, removing and replacing the battery cover compromises the complete dust and water resistance inherent in the manufacturing process. This compromises the stability of the agricultural power vehicle. Therefore, relay repair or replacement poses a significant obstacle to the commercialization of agricultural power vehicles.

[0016] [Prior Art Literature]

[0017] [Patent Document]

[0018] (Patent Document 1) Republic of Korea Patent No. 10-1251812

[0019] The present invention was conceived from consideration of a technology capable of suppressing damage to a relay in a battery pack.

[0020] A power management system for an agricultural electric work vehicle according to the present invention comprises: a battery pack for supplying power; a power distributor for distributing and supplying power output from the battery pack to each electrical component; and a general controller capable of controlling the battery pack and the power distributor; wherein the battery pack comprises: a battery module for supplying power; and a first relay module for relaying power output from the battery module to the power distributor and controlling power output from the battery module; wherein the power distributor comprises: a second relay module connected to the first relay module for controlling power output from the battery pack; and a distribution circuit for distributing power output via the second relay module to the electrical components; wherein the general controller controls the second relay module to be turned off and then the first relay module to be turned off when switching to a power-off state.

[0021] When the above general controller is switched to the power ON state, it turns on the second relay module and then controls the first relay module to turn on.

[0022] The battery pack further includes a battery management unit that communicates with the general controller and manages the battery module and the first relay module; the first relay module is turned on and off by the battery management unit, and the second relay module is turned on and off by the general controller.

[0023] The above general controller monitors the current in real time, and when the current falls below a certain value, it turns off the second relay module and transmits an off message to the battery management unit to turn off the first relay module.

[0024] The first relay module may include a first + relay arranged on a + line among power lines; a first - relay arranged on a - line among power lines; and a precharger relay arranged in parallel to the first + relay; and a resistance element arranged in series with the precharger relay and in parallel to the first + relay.

[0025] The above battery pack further includes a battery management unit for communicating with the general controller and managing the battery module and the first relay module; wherein, when the power is switched to an ON state, the battery management unit turns on the first-relay and the precharger relay while keeping the first+ relay off, and when the capacitor of the inverter is fully charged, turns on the first+ relay while turning off the precharger relay.

[0026] A relay control method for an agricultural electric work vehicle according to the present invention comprises: a monitoring step for monitoring information in real time; a fault diagnosis step for analyzing information obtained in the monitoring step to diagnose whether a fault has occurred; a first off step for turning off a second relay module included in a power distributor if a fault is diagnosed in the fault diagnosis step; and a second off step for turning off the first relay module included in a battery pack after the first off step.

[0027] The above monitoring step monitors the current value on the power circuit, and the above fault diagnosis step diagnoses a fault when the current value on the power circuit falls below a certain value.

[0028] In the first off stage, the general controller turns off the second relay module, and in the second off stage, the battery management unit turns off the first relay module.

[0029] The above-mentioned general controller further includes an off-message generation and transmission step in which an off-message is generated to turn off the first relay module and transmitted to the battery management unit; and the battery management unit performs the second off-step when the off-message is received.

[0030] The first off-step is performed by a general controller that controls the battery pack and the power distributor, and the second off-step is performed by a battery management unit included in the power distributor.

[0031] According to the present invention, the following effects are achieved.

[0032] First, it minimizes damage to the battery pack during repairs or replacements. This helps maintain the durability of the battery pack and extend its lifespan.

[0033] Second, because it can operate in emergency mode even if some relays fail, agricultural power vehicles can be transported directly to a repair shop. This facilitates repairs due to relay failures.

[0034] Figure 1 shows an example of a power management system that can be applied to an agricultural electric work vehicle.

[0035] Figure 2 is a configuration diagram of a power management system for an agricultural electric work vehicle according to one embodiment of the present invention.

[0036] Figures 3 to 5 are flowcharts for explaining the power management system of an agricultural electric work vehicle according to the present invention.

[0037] A preferred embodiment according to the present invention is described with reference to the attached drawings, but for the sake of brevity, descriptions of well-known components are omitted or compressed as much as possible.

[0038] FIG. 2 is a configuration diagram of a power management system (200, hereinafter abbreviated as “power management system”) of an agricultural electric work vehicle according to one embodiment of the present invention.

[0039] The power management system (220) according to the embodiment of FIG. 2 includes a battery pack (210), a power distributor (220), and a general controller (230).

[0040] The battery pack (210) supplies power and controls the supplied power. To this end, the battery pack (210) includes a battery module (211), a first relay module (212), and a battery management unit (213).

[0041] The battery module (211) is composed of batteries in cell units and is a supply source that supplies high-voltage power.

[0042] The first relay module (212) is a PRA placed between the battery module (211) and the power distributor (220).

[0043] The first relay module (212) relays the power output from the battery module (211) to the power distributor (220).

[0044] In addition, the first relay module (212) controls the power output from the battery module (211) to protect the battery module (211) or electrical components (241 to 246, etc.).

[0045] Specifically, the first relay module (212) includes a first+ relay (212a), a first-relay (212b), a precharger relay (212c), and a resistance element (212d).

[0046] The first + relay (212a) is placed on the + line among the power lines. The first + relay (212a) connects or blocks the + line.

[0047] The first relay (212b) is placed on the -line among the power lines. The first relay (212b) connects or blocks the -line.

[0048] The precharger relay (212c) is arranged in parallel to the first+ relay (212a). The precharger relay (212c) selectively connects the + line to the first+ relay (212a).

[0049] The resistor element (212d) is arranged in series with the precharge relay (212c) and in parallel with the first+ relay (212a). The resistor element (212d) lowers the voltage between the + line and the - line.

[0050] The precharge relay (212c) and the resistor element (212d) are provided to protect the inverter (241a, 242a).

[0051] For example, if a high voltage is directly input to the inverter (241a, 242a) when the power is switched on, hardware damage may occur to the inverter (241a, 242a). Therefore, when the power is switched on, the precharger relay (212c) is turned on first to charge the capacitor of the inverter (241a, 242a). At this time, the first+ relay (212a) is turned off. Then, when the capacitor of the inverter (241a, 242a) is charged, the precharger relay (212c) is turned off and the first+ relay (212a) is turned on. By preventing the phenomenon of a sudden voltage being input to the inverter (241a, 242a) in this way, damage to the inverter (241a, 242a) can be prevented. The operation of this first relay module (212) is controlled by the battery management unit (213) described later.

[0052] The precharge relay (212c) turns on only when the power is switched on, connecting the + line, and turns off during high voltage operation.

[0053] The battery management unit (213) is commonly called BMS (Battary Management System) and manages the battery module (211).

[0054] The battery management unit (213) precisely maintains the balance between battery cells and functions to ensure that all battery cells are fully charged.

[0055] In addition, the battery management unit (213) functions to fully utilize the electric energy stored in the battery module (211). To this end, the battery management unit (213) monitors the status (current, voltage, temperature, etc.) of the battery module (211) and controls the battery module (211) so that it can be maintained and used under optimal conditions.

[0056] In particular, the battery management unit (213) of the present invention manages the first relay module (212) while communicating with the general controller (230).

[0057] The battery management unit (213) controls the first relay module (212) during the power on / off process. That is, the battery management unit (213) controls the on / off operations of the first+ relay (212a), the first-relay (212b), and the precharger relay (212c) of the first relay module (212).

[0058] The power distributor (220) is commonly referred to as a PDU (Power Distribution Unit) and distributes and supplies power output from the battery pack (210) to each of the electrical components (241 to 246). To this end, the power distributor (220) is placed between the battery pack (210) and various electrical components (241 to 246). More specifically, the power distributor (220) is placed between the first relay module (212) of the battery pack (210) and various electrical components (241 to 246). Here, the electrical components (241 to 246) may be diverse.

[0059] For example, one of the electric components (241) may be a driving motor for operating the driving wheel.

[0060] For example, one of the electrical components (242) may be a pump motor for operating a hydraulic pump.

[0061] For example, one of the electrical components (243) may be a heater.

[0062] For example, one of the components (244) may be a cooling fan.

[0063] For example, one of the components (245) may be a compressor.

[0064] For example, one of the electric components (246) may be a low voltage converter (LDC) that converts the high voltage of the battery module (211) into a low voltage to charge a 12 V low voltage battery.

[0065] In the case of electrical components (241 to 246) above that operate on AC (241, 242: driving motor or pump motor, etc.), an inverter (241a, 242a) may be additionally required to convert direct current into AC.

[0066] The various electrical components (241 to 246) as described above function as loads that consume electricity during the operation of an agricultural electric work vehicle.

[0067] According to the present invention, the power distributor (220) includes a second relay module (221) and a distribution circuit (222).

[0068] The second relay module (221) is a PRA placed between the battery pack (210) and the distribution circuit (222). Specifically, the second relay module (221) is placed between the first relay module (212) of the battery pack (210) and the distribution circuit (222).

[0069] The second relay module (221) is connected to the first relay module (212) and ultimately controls the power output from the battery module (211). To this end, the second relay module (221) includes a second+ relay (221a) and a second-relay (221b).

[0070] The second+ relay (221a) is connected to the first+ relay (212a) of the first relay module (211) and is placed on the + line among the power lines. The second+ relay (221a) connects or blocks the + line.

[0071] The second relay (221b) is connected to the first relay (212b) of the first relay module (212) and is placed on the -line among the power lines. The second relay (221b) connects or blocks the -line.

[0072] The distribution circuit (222) distributes the power output through the second relay module (221) to the electrical components (241 to 246).

[0073] The general controller (230) is commonly called a VCU (Vehicle Control Unit) and controls the operation, fault diagnosis, and safety mode execution of agricultural electric work vehicles.

[0074] For example, the general controller (230) operates the driving motor (241) by calculating the optimal target torque suitable for the driving situation based on various information about the vehicle status, including monitoring or the driver's intention.

[0075] For example, the general controller (230) performs energy management by considering the remaining capacity of the battery pack (210).

[0076] For example, the general controller (230) executes a fault diagnosis and safe mode execution function through real-time monitoring.

[0077] According to the present invention, the general controller (230) controls the power distributor (220). In particular, the general controller (230) directly controls the operation of the second relay module (221) in the power distributor (220).

[0078] Additionally, the general controller (230) can control the battery pack (210).

[0079] According to a preferred example, the general controller (230) can generate an off message to turn off the first relay module (212). The generated off message is then transmitted from the general controller (230) to the battery management unit (213) via CAN communication. Then, the battery management unit (213) turns off the first relay module (212) according to the received off message. In this way, the general controller (230) can control the power distributor (220) while also controlling the battery pack (210).

[0080] In this embodiment, the battery management unit (213) is implemented to control the on-off of the first relay module (212), and the general controller (230) is implemented to directly control the on-off of the second relay module (221).

[0081] For example, when switching to a power off state, the general controller (230) turns off the second relay module (221) and transmits an off message to the battery management unit (213). Then, the battery management unit (213) turns off the first relay module (212) according to the off message. Therefore, according to the present invention, when switching to a power off state, the second relay module (221) is turned off first and then the first relay module (212) is turned off. That is, the second relay module (221) and the first relay module (212) are sequentially turned off.

[0082] For example, the general controller (230) monitors the current in the power circuit in real time and turns off the second relay module (221) when the current falls below a certain value. At this time, the general controller (230) also generates an off message and transmits it to the battery management unit (213). Accordingly, the battery management unit (213) turns off the first relay module (212).

[0083] For example, when switching to the power-on state, the general controller (230) turns on the second relay module (221) and then controls the first relay module (212) to turn on. More specifically, the general controller (230) turns on the second relay module (221) and then generates an on message and transmits it to the battery management unit (213). Then, the battery management unit (213) that receives the on message turns on the first relay module (212).

[0084] Next, a representative power on / off operation performed in a power management system (200) having the above configuration will be described.

[0085] <Relay control method when powering on>

[0086] 1. Receiving driver commands <s11>

[0087] When the driver commands to turn on the power to drive the agricultural electric work vehicle (Key On command), the general controller (230) receives the on command.

[0088] 2. Breakdown inspection <s12>

[0089] The general controller (230) uses power from a 12V low-voltage battery to check for any malfunctions in various electrical components (241 to 246) or electrical elements. If no malfunctions are found, key start control is performed.

[0090] 3. Second relay module on <s13>

[0091] At key start, the general controller (230) first turns on the second relay module (221). Accordingly, the second+ relay (221a) and the second-relay (221b) are switched to the on state.

[0092] 4. Create and send an on-message <s14>

[0093] The general controller (230) generates an on message and transmits it to the battery management unit (213).

[0094] 5. 1st relay module on <s15>

[0095] A. The battery management unit (230) first turns on the first relay (212b) and the precharger relay (212c) according to the on message. <s15a>. Accordingly, the capacitor of the inverter (241a, 242a) is charged with a relatively low voltage.

[0096] B. After the charging of the capacitor of the inverter (241a, 242a) is completed, the battery management unit (213) turns on the first + relay (212a) and turns off the precharge relay (212c). <s15b>. Therefore, the electric components (241 to 246) are electrically connected to the battery module (211) and can be selectively driven according to the driver's operation.

[0097] For reference, before the key start, no current flows to the electrical components (241 to 246). In that state, there is no concern that the relays (211a, 211b, 211c, 221a, 221b) will be damaged during the operation process in which the relays (211a, 211b, 211c, 221a, 221b) are turned on. Therefore, it may be desirable to implement the general controller (230) so that either the first relay module (211) or the second relay module (221) is turned on first during the key start. That is, the above steps S13 and S14 may be performed in reverse order or at the same time.

[0098] <Relay control method when power is turned off>

[0099] 1. Receiving driver commands <s21>

[0100] When the driver commands to turn off the power of the agricultural electric work vehicle (Key Off command), the general controller (230) receives the off command.

[0101] 2. Turn off the second relay module <s22>

[0102] The general controller (230) first turns off the second relay module (221) in response to the off command. Accordingly, the second+ relay (221a) and the second-relay (221b) are switched to the off state.

[0103] 3. Create and send an off-message <s23>

[0104] The general controller (230) generates an off message and transmits it to the battery management unit (213).

[0105] 4. Turn off the first relay module <s24>

[0106] The battery management unit (213) turns off the first+ relay (212a) and the first-relay (212b) according to the received off message.

[0107] In this way, since the second relay module (221) is turned off first and the first relay module (212) is turned off later, damage due to spark generation, etc. can accumulate mainly only on the second relay module (221) side. Therefore, damage to the first relay module (212) can be relatively suppressed.

[0108] Depending on the implementation, it may also be considered to replace S21 at the time of key-off so that the general controller (230) monitors the current value on the power circuit rather than the key-off command.

[0109] For example, if the monitored current value is less than a certain value (e.g., '1A'), the general controller (230) can perform steps S22 to S24.

[0110] <Relay control method when a malfunction occurs>

[0111] 1. Monitoring <s31>

[0112] Sudden breakdowns may occur during operation of agricultural power vehicles.

[0113] For example, failure of electrical components that are fatal to stable operation may occur.

[0114] For example, a current value on a power circuit monitored in real time may have an abnormal value due to a failure in a certain part.

[0115] Accordingly, even while the agricultural electric work vehicle is in operation, the general controller (230) continuously monitors information such as current values ​​in electrical components (241 to 246), electrical elements, or power circuits. Through the information obtained through this monitoring, the general controller (230) can check for failures in electrical components (241 to 246) or electrical elements.

[0116] 2. Fault Diagnosis <s32>

[0117] The general controller (230) analyzes the information obtained through monitoring in step S31 to diagnose whether a fault has occurred.

[0118] There may be various types of failures, and the general controller (230) is implemented to be able to diagnose whether a failure exists for each type.

[0119] For example, if an abnormal operating value is received from a sensor monitoring the operation of a powertrain component (241 to 246), the general controller (230) can diagnose it as a failure.

[0120] For example, if the current value on the power circuit monitored in real time is an abnormal value (e.g., less than 1 A), the general controller (230) can diagnose it as a failure.

[0121] If there is no failure, the general controller (230) repeats steps S21 and S32. However, if a failure is diagnosed, the general controller (230) controls steps S22 to S35 to be performed.

[0122] 3. Turn off the second relay module <33>

[0123] When the general controller (230) is diagnosed as having a fault condition, it turns off the second relay module (221). Accordingly, the second+ relay (221a) and the second-relay (221b) are switched to the off state.

[0124] 4. Create and send an off-message <s34>

[0125] The general controller (230) generates an off message and transmits it to the battery management unit (213).

[0126] 5. Turn off the first relay module <s35>

[0127] The battery management unit (213) turns off the first+ relay (212a) and the first-relay (212b) according to the off message.

[0128] According to the present invention, even in the event of a failure, the second relay module (221) is turned off first, and the first relay module (212) is turned off later. Therefore, damage to the first relay module (212) can be suppressed even in the event of a failure.

[0129] Additional Information

[0130] 1. Additional information on relay control

[0131] According to the present invention, two relay modules (212, 221) referred to as PRA are provided. Among them, the first relay module (212) is provided in the battery pack (210), and the second relay module (221) is provided in the power distributor (220). That is, there are two components that can turn the power on / off on the power circuit. Therefore, even if one side is damaged, the agricultural electric work vehicle can be properly driven by appropriately controlling the relay module (212, 221) on the other side. Of course, the general controller (230) needs to be implemented to notify the driver if the relay module (212, 221) on either side is damaged.

[0132] Therefore, if there is damage to the relay module (212, 221) on one side but the operation of the agricultural electric work vehicle is possible, the general controller (230) controls the operation of the agricultural electric work vehicle in emergency mode.

[0133] For example, the second relay module (221) may malfunction if the second relay (221a) of the second relay module (221) sticks and is always on. In this case, the general controller (230) can control the on / off of the first relay (212a) of the first relay module (212) to turn the power on / off.

[0134] For example, the first relay (212b) of the first relay module (212) may stick and always be in an on state, causing the first relay module (212) to malfunction. In this case, the general controller (230) can control the on / off of the second relay (221b) of the second relay module (221) to turn the power on / off.

[0135] Alternatively, one of the relays (212a, 212b) of the first relay module (212) may be faulty, and one of the relays (221a, 221b) of the second relay module (221) may be faulty.

[0136] For example, the first relay (212b) of the first relay module (212) may malfunction while always being on and the second relay (221a) of the second relay module (221) may malfunction while always being on. In this case, the general controller (230) may control the on / off of the first relay (212a) of the first relay module (212) and the second relay (221b) of the second relay module (221) to turn the power on / off.

[0137] That is, the general controller (230) can diagnose whether the agricultural work vehicle can be driven in a selective failure situation of the + relay (212a) and - relay (212b) of the first relay module (212) and the + relay (221a) and - relay (221b) of the second relay module (221). In addition, if the agricultural work vehicle can be driven in emergency mode, the general controller (230) can notify the driver and control the operation of the agricultural work vehicle in emergency mode according to the driver's operation.

[0138] In the above case, the driver can operate the agricultural work vehicle even in the event of a failure in some of the relays (212a, 212b, 221a, 221b). Therefore, when a failure notification for the relay module (212, 221) occurs, the driver can drive the agricultural work vehicle directly to a repair shop and easily repair the relay module (212, 221), unlike in the past.

[0139] However, in the event of a failure of the precharger relay (212c), operation in emergency mode should not be permitted.

[0140] 2. Additional information on damage caused by use

[0141] According to the present invention, the second relay module (221) is more susceptible to damage from use than the first relay module (212). Therefore, the lifespan of the second relay module (221) is shorter than that of the first relay module (212). Therefore, the driver can often repair or replace the second relay module (221). However, since the second relay module (221) only requires disassembly and assembly of the distribution box, which has relatively less concern about dustproofing or waterproofing, the work is easy and there is no need to worry about damage to the dustproofing or waterproofing of the battery module (211). In addition, since the replacement cycle of the first relay module (212) is extended, repairs to the battery pack (210) can be minimized.

[0142] The above-described embodiments merely illustrate preferred examples of the present invention, and it may have various applications. Therefore, the present invention should not be construed as limited to the above-described content. Instead, the scope of the present invention should be construed within the scope of the separately described claims and their equivalents.

Claims

1. Battery pack (210) that supplies power; A power distributor (220) that distributes and supplies power output from the battery pack (210) to each electric component (241 to 246); and Includes a general controller (230) capable of controlling the battery pack (210) and the power distributor (220); The above battery pack (210) is A battery module (211) for supplying power; and It includes a first relay module (212) for relaying the power output from the battery module (211) to the power distributor (220) and controlling the power output from the battery module (211); The above power distributor (220) is A second relay module (221) connected to the first relay module (212) and for controlling the power output from the battery pack (210); and A distribution circuit (222) for distributing the power output through the second relay module (221) to the electric components (241 to 246); The above general controller (230) controls to turn off the second relay module (221) and then turn off the first relay module (212) when switching to the power off state. Power management system for agricultural electric work vehicles (200).

2. In paragraph 1, The above general controller (230) controls the first relay module (212) to turn on after turning on the second relay module (221) when the power is switched to the ON state. Power management system for agricultural electric work vehicles (200).

3. In paragraph 1, The above battery pack (210) is It further includes a battery management unit (213) for communicating with the above general controller (230) and managing the battery module (211) and the first relay module (212); The above first relay module (212) is turned on and off by the battery management unit (213). The above second relay module (221) is turned on and off by the general controller (230). Power management system for agricultural electric work vehicles (200).

4. In paragraph 3, The above general controller (230) monitors the current in real time and when it drops below a certain current value, it turns off the second relay module (221) and transmits an off message to the battery management unit (213) to turn off the first relay module (212). Power management system for agricultural electric work vehicles (200).

5. In paragraph 1, The above first relay module (212) is The first + relay (212a) placed on the + line among the power lines; The first relay (212b) placed on the -line among the power lines; and A precharger relay (212c) arranged in parallel to the first+ relay (212a); and A resistor element (212d) arranged in series with the precharger relay (212c) and in parallel with the first+ relay (212a); Power management system for agricultural electric work vehicles (200).

6. In paragraph 5, The above battery pack (210) is It further includes a battery management unit (213) for communicating with the above general controller (230) and managing the battery module (211) and the first relay module (212); The above battery management unit (213) is When the power is switched to the ON state, the first+ relay (212a) is turned on while the first-relay (212b) and the precharger relay (212c) are turned on while maintaining the OFF state, and when the capacitor of the inverter (241a, 242a) is fully charged, the first+ relay (212a) is turned on while the precharger relay (212c) is turned off. Power management system for agricultural electric work vehicles.

7. Monitoring stage to monitor information in real time <s31> ;< / s31> The above monitoring steps <s31>A fault diagnosis step that analyzes the information obtained from the system to diagnose whether a fault has occurred. <s32> ;< / s32> The above fault diagnosis steps <s32>When diagnosed as a failure, the first off stage turns off the second relay module (221) included in the power distributor (220). <s33> ; and The above first off-step <s33>The second off stage that turns off the first relay module (212) included in the battery pack (210) <s35> ; including Relay control method for agricultural electric work vehicles.

8. In paragraph 7, The above monitoring steps <s31> monitors the current value on the power circuit, The above fault diagnosis steps <s32> It is diagnosed as a failure when the current value in the power circuit falls below a certain value. Relay control method for agricultural electric work vehicles.

9. In paragraph 7, The above first off-step <s33> In , the general controller (230) turns off the second relay module (221), The above second off-step <s35> In the battery management unit (213), the first relay module (212) is turned off. Relay control method for agricultural electric work vehicles.

10. In paragraph 9, An off message generation and transmission step in which the above general controller (230) generates an off message to turn off the first relay module (212) and transmits it to the battery management unit (213). <s34> ; including more, The above battery management unit (213) starts the second off stage when an off message is received. <s35> to perform Relay control method for agricultural electric work vehicles.

11. In paragraph 7, The above first off-step <s33> In this case, the above battery pack (210) and the power distributor (220) are controlled by a general controller (230).< / s33> The above second off-step <s35> In the above power distributor (220), the battery management unit (213) is included.< / s35> Relay control method for agricultural electric work vehicles.

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