Direct current battery pack repair device

Abstract

This invention provides a DC battery pack repair device. A 220V AC power supply is connected to three parallel circuits. The first circuit connects a first switch SB1, a second switch SB2, and an intermediate relay kA1. The normally open contact of the first switch SB1 is connected in parallel with the normally open contact of kA1. The second circuit is divided into two branches: one branch connects the normally open contact of kA1 and a stop indicator light; the other branch connects the normally closed contact of kA1 and a working indicator light. The third circuit connects a single-phase bridge rectifier UR. The single-phase bridge rectifier UR connects a changeover switch, parallel coils of KM1, KM2, and KM3, and SA1. The voltage across the battery pack is connected to the device via DC positive and negative terminals. In the DC circuit, the main contacts of DC contactors KM1, KM2, and KM3 are connected in series with discharge resistors R1, R2, and R3, respectively. After the three circuits are connected in parallel, a DC shunt FL and an ammeter are connected in series. This invention enables deep equalization discharge and recharging of the substation battery pack, reactivating the battery plates that have softened due to long-term float charging.

Description

Technical Field

[0001] This utility model belongs to the field of electronic circuit application technology, and in particular relates to a DC battery pack repair device. Background Technology

[0002] The company's current high-voltage power system control and operation power is provided by DC power distribution cabinets. To prevent control system malfunction due to high-voltage power loss, which could further escalate the fault and impact production, the operation power is composed of a rectifier module output system and a battery sustaining system connected in parallel. The battery consists of eighteen 12-volt lead-acid batteries connected in series. When the external voltage is normal, the operation power is provided by the rectifier module, which also provides a 246-volt float charge voltage to the battery bank. In the event of an external power failure, the battery bank directly provides control and operation power to the system. The standard lifespan of the batteries is eight to ten years. Some of the DC power distribution cabinets in the company's substations have been in operation for fifteen years, and some batteries have reached their end-of-life, posing a significant fire hazard. The company has not yet acquired high-power battery bank repair equipment. To prevent control system malfunction due to high-voltage system power loss, which could affect the company's power supply operation, further measures are being taken. Utility Model Content

[0003] This utility model aims to solve the problem of DC battery pack aging causing high-voltage system power loss and control system failure. It provides a DC battery pack repair device that can extend the service life of the battery after activation and repair, and ensure the safe and stable operation of the DC system in the company's substation.

[0004] To achieve the above-mentioned utility model objectives, this utility model provides a DC battery pack repair device, including a 220V AC power supply. The 220V AC power supply is connected to three parallel circuits. The first circuit is connected to a first switch SB1, a second switch SB2, and an intermediate relay kA1. The first switch SB1 is connected in parallel with the normally open contact of kA1. The second circuit is divided into two branches. One branch is connected to the normally open contact of kA1 and a stop indicator light. The other branch is connected to the normally closed contact of kA1 and a working indicator light. The third circuit is connected to a single-phase bridge rectifier UR. The single-phase bridge rectifier UR is connected to a changeover switch, parallel coils KM1, KM2, and KM3, and SA1. The 220V power supply is provided to the single-phase bridge rectifier UR through the normally open contact of kA1 and converted into a DC 200V voltage.

[0005] It also includes a battery pack. The voltage at both ends of the battery pack is connected to the device via DC positive and negative connections. It is connected in parallel with the battery pack voltmeter to indicate the current battery pack voltage. In the DC circuit, the main contacts of DC contactors KM1, KM2, and KM3 are connected in series with discharge resistors R1, R2, and R3, respectively. After the three circuits are connected in parallel, they are connected in series with the DC shunt FL and the ammeter. The 220V control power supply powers the discharge ammeter and the battery pack voltmeter.

[0006] Furthermore, it also includes a temperature measuring module C and a temperature controller. The temperature measuring element is used to monitor the temperature of the repair device and transmit the temperature to the temperature controller. The temperature controller controls the opening and closing of the exhaust equipment S to control the temperature during the operation of the repair device.

[0007] This invention enables deep equalization discharge and recharging of substation battery banks, reactivating the battery plates that have softened due to prolonged float charging. After activation and repair, the battery's lifespan can be extended, ensuring the safe and stable operation of the company's substation DC system. The device is highly versatile, performs stably, and has significant potential for widespread application. Attached Figure Description

[0008] Figure 1 This is the electrical schematic diagram of the DC battery pack repair device of this utility model; Detailed Implementation

[0009] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of a DC battery pack repair device.

[0010] Reference Figure 1 The 220V AC power supply is connected to three parallel circuits. The first circuit connects to the first switch SB1, the second switch SB2, and the intermediate relay kA1. The normally open contact of the first switch SB1 is connected in parallel with the normally open contact of kA1. Pressing SB1 energizes the intermediate relay kA1, and kA1 simultaneously latches itself. The second circuit is divided into two branches: one branch connects the normally open contact of kA1 and a stop indicator light; the other branch connects the normally closed contact of kA1 and a working indicator light. The normally open and normally closed contacts of KA1 control the stop and working indicator lights, respectively. The third circuit connects to a single-phase bridge rectifier UR. The single-phase bridge rectifier UR is connected to a changeover switch, parallel coils KM1, KM2, and KM3, and SA1. 220V is supplied to the single-phase bridge rectifier UR through the normally open contact of kA1 and converted to 200V DC voltage. The changeover switch SA1 supplies power to the coils of KM1, KM2, and KM3 respectively. By observing the discharge current, the SA1 contact is adjusted, and the discharge resistor is switched to achieve the ideal discharge current effect.

[0011] The voltage across the battery pack is connected to the device via positive and negative DC inputs, and is connected in parallel with the battery pack voltmeter to indicate the current battery pack voltage. In the DC circuit, the main contacts of DC contactors KM1, KM2, and KM3 are connected in series with discharge resistors R1, R2, and R3, respectively. After the three circuits are connected in parallel, they are connected in series with the DC shunt FL and the ammeter.

[0012] The 220V control power supply powers the discharge ammeter A, the battery pack voltmeter V, and the internal temperature display instrument of the operating equipment.

[0013] The PT100 temperature measurement module C inside the equipment is connected to the temperature controller. The temperature measurement module is used to monitor the temperature of the repair device and transmit the temperature to the temperature controller. The temperature controller displays and controls the exhaust equipment S to ensure the temperature of the repair device during operation.

[0014] Battery packs operate in a floating-charge state year-round with virtually no discharge process, which can reduce battery life over time. This device performs controlled, high-current deep discharge of the battery. By adjusting the switching of internal resistance through a discharge device, the battery pack is deeply discharged while ensuring that the rated current is not exceeded. Then, the original system recharges the battery, thus extending its lifespan by activating the chemical substances inside the battery.

Claims

1. A DC battery pack repair device, characterized in that: It includes a 220V AC power supply, which connects to three parallel circuits. The first circuit connects the first switch SB1, the second switch SB2, and the intermediate relay kA1. The first switch SB1 is connected in parallel with the normally open contact of kA1. The second circuit is divided into two branches. One branch connects the normally open contact of kA1 and the stop indicator light. The other branch connects the normally closed contact of kA1 and the working indicator light. The third circuit connects to a single-phase bridge rectifier UR. The single-phase bridge rectifier UR is connected to a changeover switch, parallel coils KM1, KM2, and KM3, and SA1. The 220V power supply is provided to the single-phase bridge rectifier UR through the normally open contact of kA1 and converted to a DC 200V voltage. It also includes a battery pack. The voltage at both ends of the battery pack is connected to the device via DC positive and negative connections. It is connected in parallel with the battery pack voltmeter to indicate the current battery pack voltage. In the DC circuit, the main contacts of DC contactors KM1, KM2, and KM3 are connected in series with discharge resistors R1, R2, and R3, respectively. After the three circuits are connected in parallel, they are connected in series with the DC shunt FL and the ammeter. The 220V control power supply powers the discharge ammeter and the battery pack voltmeter.

2. The DC battery pack repair device according to claim 1, characterized in that: It also includes a temperature measuring module C and a temperature controller. The temperature measuring element is used to monitor the temperature of the repair device and transmit the temperature to the temperature controller. The temperature controller controls the opening and closing of the exhaust equipment S to control the temperature during the operation of the repair device.

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