Safe power supply system suitable for overhead working truck and overhead working truck

Abstract

The invention relates to the field of power supplies of overhead working trucks, in particular to the field of safety optimization of the power supplies of the overhead working trucks. According to the scheme, the safe power supply system suitable for the overhead working truck comprises a battery pack and a charging module used for charging the battery pack, the battery pack comprises a battery pack, a battery management system and an output interface, and the safe power supply system further comprises a shunt connected with the battery management system; the battery management system identifies charging current, when the charging current is larger than a preset threshold value, the battery management system connects the diverter into a charging circuit, and after the diverter is connected into the charging circuit, one end of the diverter is connected with the battery pack, and the other end of the diverter is connected with the charging module. The invention aims to provide a safe power supply system suitable for an overhead working truck and the overhead working truck. According to the power supply system, the circuit is protected, the current flowing into the battery pack is reduced by using the shunt design when the charging current is relatively large, and the charging safety of the battery pack is enhanced.

Description

Technical Field

[0001] This invention relates to the field of power supply for aerial work platforms, and more specifically to the field of safety optimization of power supply for aerial work platforms. Background Technology

[0002] Aerial work platforms, due to their convenience, safety, and reliability, are gradually replacing traditional scaffolding and are widely used on various construction sites. Chinese patent document CN201811449354.9 discloses an aerial work platform vehicle, which mainly includes a vehicle body, a lifting device, and a platform connected to the lifting device at a higher position. The vehicle body moves within the work area, the lifting device adjusts the platform height, and workers stand on the platform to perform their tasks.

[0003] This type of vehicle is powered by electricity, such as a lead-acid battery pack. Due to the low capacity, long charging time, short lifespan, and need for regular maintenance of lead-acid batteries, modern aerial work platforms often use lithium batteries instead. However, while lithium batteries have advantages such as high capacity and long lifespan, their circuitry is also highly susceptible to damage during use. Short circuits or damage to circuit components can even lead to extreme situations like spontaneous combustion. In particular, the charging current can easily increase. Excessive charging current can not only burn out the battery but also damage other electronic components connected to it. Summary of the Invention

[0004] The purpose of this invention is to provide a safe power supply system suitable for aerial work platforms and for aerial work platforms themselves. This power supply system incorporates circuit protection design, using a shunt design to reduce the current flowing into the battery pack when the charging current is high, thereby enhancing the charging safety of the battery pack.

[0005] This invention is achieved through the following technical solution: a safe power supply system for aerial work platforms, comprising a battery pack and a charging module for charging the battery pack. The battery pack includes a battery array, a battery management system, and an output interface, and also includes a shunt connected to the battery management system. The battery management system identifies the charging current. When the charging current exceeds a preset threshold, the battery management system connects the shunt to the charging circuit. After being connected to the charging circuit, one end of the shunt is connected to the battery array, and the other end is connected to the charging module.

[0006] As a preferred embodiment of the present invention, a relay is also included, the relay comprising a coil portion and a switch portion, the coil portion being connected to the battery management system, one end of the switch portion being connected to the battery pack, and the other end being connected to the output interface; the coil portion is configured such that when the coil portion detects a failure in the activation control of the battery management system, the switch portion disconnects the circuit.

[0007] As a preferred embodiment of the present invention, the battery management system is connected to an 8-pin connector, the 8-pin connector including an interface for connecting a self-activation circuit, wherein when the coil detects no current input in the interface, it determines that the activation control of the battery management system has failed.

[0008] As a preferred embodiment of the present invention, a short-circuit fuse is also included, one end of which is connected to the battery pack, and the other end is connected to the battery management system via an electrical appliance.

[0009] As a preferred embodiment of the present invention, the short-circuit fuse has a fusing current of 10A.

[0010] As a preferred embodiment of the present invention, the battery management system is connected to an 8-pin connector, one end of the short-circuit fuse is connected to the battery pack through one of the interfaces of the 8-pin connector, and the other end is connected to an electrical appliance.

[0011] The aerial work platform includes a base vehicle, a lifting device connected to the base vehicle, and a platform connected to the lifting device. The safety power supply system is installed on the base vehicle, and the handle controller is installed on the platform.

[0012] As a preferred embodiment of the present invention, the chassis includes a vehicle body and a door hinged to the vehicle body, and a safety power supply system is installed on the door.

[0013] As a preferred embodiment of the present invention, the vehicle door is equipped with a main controller, a hydraulic control system and a drive control system, the main controller being communicatively connected to the handle controller and the battery management system.

[0014] In summary, the present invention has the following beneficial effects: 1. When a short circuit occurs in the battery pack, the current will exceed the rated current. At this time, the short-circuit fuse will blow, thus protecting the battery pack.

[0015] 2. When the charging current exceeds a preset threshold, the BMS controls the shunt to connect to the charging circuit. This consumes a portion of the current in the charging circuit, reducing the current pressure on the battery pack during charging and protecting the battery pack.

[0016] 3. When a circuit malfunctions, the BMS will fail to activate, and the relay switch will disconnect the circuit. This prevents the battery pack from continuing to supply power to the circuit during a fault, thus avoiding damage to the electronic components.

[0017] 4. Many electronic components are installed on the two doors, which means that when electronic components need to be inspected or repaired, they can be operated simply by flipping down the door. Maintenance personnel have ample space and do not need to crawl into the vehicle body to operate them. Attached Figure Description

[0018] Figure 1 This is a detailed circuit diagram of Example 1; Figure 2 This is a schematic diagram of the hardware structure of Example 1; Figure 3 This is a top view of the vehicle body.

[0019] In the diagram: 1. Undercarriage, 11. Vehicle body, 12. Door, 2. Lifting device, 3. Platform, 41. Battery pack, 42. Main controller, 43. Handle controller, 44. Hydraulic control system, 46. Drive control system. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0022] The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made to the function and arrangement of the described elements without departing from the scope of this specification. Various processes or components may be appropriately omitted, substituted, or added to the examples. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.

[0023] Example 1, applicable to the safety power supply system of aerial work platforms, such as... Figure 1 As shown in the diagram, the dashed box in the upper left corner represents the battery pack, which includes the BMS (Battery Management System) and the battery array, consisting of multiple lithium batteries connected in series. The specific number of batteries can be chosen according to the specific circuit specifications, and this case does not impose any restrictions. The BMS is connected in parallel with the battery array. The BMS includes a control module and an 8-pin connector. The former is represented by a solid box labeled "BMS" in the diagram, and the latter is the connector marked "EGFHACDB". The "Battery+" and "Battery-" terminals shown in the diagram are the output interfaces of the entire battery pack, the positive and negative terminals, used to supply power to the electrical appliances required by the aerial work platform.

[0024] This design incorporates short-circuit protection for the battery pack; specifically, a short-circuit fuse is installed. Figure 1The fuse in the diagram, Fuse2, has a fusing current of 10A. One end of the short-circuit fuse needs to be connected to the battery pack, and the other end needs to be connected to the BMS via a device. In the diagram, the ECU and PCU are the devices, and the BMS includes an 8-pin connector. The left side of the short-circuit fuse is connected to the positive terminal of the battery pack through the E interface of the 8-pin connector, the right side is connected to the ECU and PCU, and finally, it is connected to the BMS control module through the G interface of the 8-pin connector.

[0025] With this connection method, when the battery pack is short-circuited, its current will exceed the rated current, that is, exceed 10A. At this time, the short-circuit fuse will blow, thus protecting the battery pack.

[0026] In this case, there is also a shunt protection mechanism for the electrical safety of the battery pack during charging, implemented through a shunt. Battery charging involves the charging module supplying current to the battery pack. The charging module is the part in the lower left corner of the diagram that connects to the plug (the "+" and "-" terminals), and it is connected to the negative terminal of the battery pack. The BMS itself can detect the charging current in real time. When the charging current does not exceed a threshold, charging proceeds normally. When the charging current exceeds a preset threshold, the BMS controls the shunt to connect to the charging circuit. Figure 1 As shown, the shunt is connected to and controlled by the BMS. After the shunt is connected to the circuit, its right end is connected to the charging module, and its left end is connected to the negative terminal of the battery pack. It consumes a portion of the current in the charging circuit, reducing the current pressure on the battery pack during charging and protecting the battery pack.

[0027] For the battery pack's electrical protection during operation, specifically during discharge, this design includes a third layer of protection implemented via relays. However, in actual use, when a circuit fault occurs, the BMS fails to activate, rendering it unable to effectively control the entire circuit and its electronic components. Specifically, when the BMS cannot effectively control the circuit... Figure 1 The G-interface of the 8-pin connector will receive no current. A relay consists of a coil and a switching section. Figure 1 In the diagram, the two squares marking the main negative relay and the main positive relay represent the relay coil section. The coil section is connected to the BMS and can detect the absence of current at the G interface. In existing technologies, the battery pack includes a self-activation circuit; however, in this embodiment, the self-activation circuit is connected to the G interface. Therefore, by detecting whether there is current input at the G interface, the coil section is essentially detecting whether there is current input to the self-activation circuit. When there is no current input to the self-activation circuit, the BMS fails to activate, and the relay's switching section disconnects the circuit. The switching section is... Figure 1 The switch marked in the middle is the main / negative relay switch. One end of it is connected to the negative terminal of the battery pack via a shunt, and the other end is connected to the negative output interface. When the relay switch is turned off, the battery pack is disconnected from the negative output interface, thus disconnecting the entire battery pack from the negative output interface. Figure 1 The circuits on the right side are disconnected to prevent the battery pack from continuing to supply power to the circuit in the event of a circuit failure, thus avoiding damage to the electronic components in the circuit.

[0028] On the other hand, the present invention also provides an aerial work platform, such as... Figure 2 As shown, it comprises three main components: a base carriage 1, a lifting device 2, and a platform 3. The base carriage 1 includes a body 11 and a door 12, with the door 12 hinged to the body 11. A handle controller 43 is mounted on the platform 3 for easy operation by workers at height. Its electrical connection is... Figure 1 The PCU in the system is also equipped with an emergency stop switch. For example... Figure 3 As shown, Figure 3 This is a top-down view. Many electronic components are mounted on the two doors 12, allowing for easy inspection and repair by simply flipping down the door 12. This provides ample space for maintenance personnel, avoiding the need to crawl into the vehicle body 11. The battery pack 41 is located in... Figure 3 The main controller 42, hydraulic control system 44, and drive control system 46 are installed in the left-hand door of the vehicle, while those in the right-hand door are installed in the right-hand door. The main controller 42 is... Figure 1 The ECU in the middle is connected to the power management system and the handle controller 43. Meanwhile, the main controller 42 acts as the control center, controlling the drive control system 46 and the hydraulic control system 44; the former controls the vehicle's movement, and the latter controls the lifting device 2. The drive control system 46 is installed on the back of the right door.

Claims

1. A safety power supply system suitable for aerial work platforms, comprising a battery pack and a charging module for charging the battery pack, wherein the battery pack includes a battery array, a battery management system, and an output interface, characterized in that: It also includes a shunt connected to the battery management system. The battery management system identifies the charging current. When the charging current is greater than a preset threshold, the battery management system connects the shunt to the charging circuit. After being connected to the charging circuit, one end of the shunt is connected to the battery pack and the other end is connected to the charging module.

2. The safety power supply system for aerial work platforms according to claim 1, characterized in that: It also includes a relay comprising a coil section and a switch section, the coil section being connected to the battery management system, one end of the switch section being connected to the battery pack, and the other end being connected to the output interface; the coil section is configured such that when the coil section detects a failure in the activation control of the battery management system, the switch section disconnects the circuit.

3. The safety power supply system for aerial work platforms according to claim 1, characterized in that: The battery management system is connected to an 8-pin connector, which includes an interface for connecting to a self-activation circuit. When the coil detects no current input in the interface, it determines that the activation control of the battery management system has failed.

4. The safety power supply system for aerial work platforms according to claim 1, characterized in that: It also includes a short-circuit fuse, one end of which is connected to the battery pack, and the other end is connected to the battery management system via an electrical appliance.

5. The safety power supply system for aerial work platforms according to claim 4, characterized in that: The short-circuit fuse has a breaking current of 10A.

6. The safety power supply system for aerial work platforms according to claim 4, characterized in that: The battery management system is connected to an 8-pin connector. One end of the short-circuit fuse is connected to the battery pack through one of the interfaces of the 8-pin connector, and the other end is connected to an electrical appliance.

7. An aerial work platform, comprising a chassis (1), a lifting device (2) connected to the chassis (1), and a platform (3) connected to the lifting device (2), characterized in that: The safe power supply system as described in any one of claims 1-6 is installed on the chassis (1), and the handle controller (43) is installed on the platform (3).

8. The aerial work platform vehicle according to claim 7, characterized in that: The chassis (1) includes a body (11) and a door (12) hinged to the body (11), and a safety power supply system is installed on the door (12).

9. The aerial work platform vehicle according to claim 8, characterized in that: The door (12) is equipped with a main controller (42), a hydraulic control system (44) and a drive control system (46). The main controller (42) is communicatively connected to the handle controller (43) and the battery management system.

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