A scissor lift and its battery control and protection system

Abstract

The invention discloses a battery control and protection system for a scissor-type aerial work platform, comprising: a battery, a battery management system, a BMS activation relay, a power-off switch, an emergency stop switch and a key switch which form a series circuit with the battery. The positive electrode of the battery management system is connected to the positive electrode of the battery, and the negative electrode of the battery management system is connected to the negative electrode of the battery through the normally open contact of the BMS activation relay. The coil of the BMS activation relay is connected in series in the series circuit. During application, only when the power-off switch, the emergency stop switch and the key switch are all closed, the BMS activation relay will be attracted, the negative electrode of the battery will be connected to the negative electrode of the battery management system, and the battery management system will start to work; when one of the switches is opened, the BMS activation relay does not work, and the battery management system will not consume the electric energy of the battery. Therefore, there is no need to consider the problem of power loss caused by forgetting to turn off the external switch, which is beneficial to the long-term storage of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering vehicles, and particularly relates to a scissor-type aerial work vehicle and its battery control and protection system. Background Art

[0002] The self-propelled scissor-type aerial work vehicle is mainly powered by a storage battery. The power control of the existing battery management system (BMS) needs to be controlled by an external switch. Usually, an external switch needs to be connected in parallel with one of the switches in the existing control system. The on-off of the load relay of the battery management system is controlled by this switch. Although the power supply of the BMS load relay can be disconnected, if the switch is forgotten to be disconnected, the battery management system and the load relay will work continuously. Since the power consumption of the BMS and the load relay is dozens of watts during normal operation, the lithium battery will continuously discharge, which may lead to serious power loss of the battery, and even affect the service life of the lithium battery and cause the battery to be scrapped.

[0003] Therefore, how to provide a battery control and protection system to prevent battery power loss is a technical problem that those skilled in the art need to solve currently. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a scissor-type aerial work vehicle and its battery control and protection system, which can effectively prevent battery power loss and ensure that the battery can be stored for a long time.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A battery control and protection system includes: a battery, a battery management system, a BMS activation relay, a power-off switch, an emergency stop switch, and a key switch that form a series circuit with the battery. The positive electrode of the battery management system is connected to the positive electrode of the battery, the negative electrode of the battery management system is connected to the negative electrode of the battery through the normally open contact of the BMS activation relay, and the coil of the BMS activation relay is connected in series in the series circuit.

[0007] Preferably, it further includes a charger, a charger activation relay, and a charger relay. The positive electrode of the charger is respectively connected to the coil of the charger activation relay and the normally open contact of the charger relay. The normally open contact of the charger relay is also connected to the positive electrode of the battery. The negative electrode of the charger is connected to the negative electrode of the battery through the normally open contact of the charger activation relay and the negative electrode of the battery management system. The positive electrode of the battery management system is connected to the positive electrode of the charger through the normally open contact of the charger relay. The negative electrode of the charger is also connected to the negative electrode of the battery.

[0008] Preferably, the control switch of the charger is connected in series in the series circuit.

[0009] Preferably, a load relay is further included. The battery management system is connected to the negative electrode of the battery through the coil of the load relay, and the normally open contact of the load relay is connected to the positive electrode of the battery.

[0010] Preferably, a main controller and a power relay are further included. The coil of the power relay is connected in parallel with the coil of the BMS activation relay, and the control switch of the charger is connected to the main controller through the normally open contact of the power relay.

[0011] Preferably, the main controller is further connected to the key switch.

[0012] A scissor-type aerial work platform includes the battery control and protection system described in any one of the above.

[0013] Compared with the prior art, the above technical solution has the following advantages:

[0014] A battery control and protection system for a scissor-type aerial work platform provided by the present invention includes: a battery, a battery management system, a BMS activation relay, and a power-off switch, an emergency stop switch, and a key switch that form a series circuit with the battery. The positive electrode of the battery management system is connected to the positive electrode of the battery, the negative electrode of the battery management system is connected to the negative electrode of the battery through the normally open contact of the BMS activation relay, and the coil of the BMS activation relay is connected in series in the series circuit. During application, only when the power-off switch, the emergency stop switch, and the key switch are all closed, the BMS activation relay will be attracted, the negative electrode of the battery will be connected to the negative electrode of the battery management system, and the battery management system will start to work; when one of the power-off switch, the emergency stop switch, and the key switch is disconnected, the BMS activation relay does not work, and the battery management system will not consume the electric energy of the battery. Therefore, in this application, by making the negative electrode of the battery management system be controlled by an external BMS activation relay, there is no need to add an external switch, so there is no need to consider the problem of battery discharge caused by forgetting to turn off the external switch, which is beneficial to the long-term storage of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0016] Figure 1 It is a circuit diagram of a battery control and protection system provided by a specific embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figure 1 , Figure 1 which is a circuit diagram of a battery control and protection system provided by a specific embodiment of the present invention.

[0019] A battery control and protection system provided by an embodiment of the present invention includes: a battery, a battery management system BMS, a BMS activation relay R5, and a power-off switch QF, emergency stop switches SB0 and SB1, and a key switch SA1 that form a series circuit with the battery. The battery is preferably a lithium battery. The positive electrode of the battery management system BMS is connected to the positive electrode of the battery, and the negative electrode of the battery management system BMS is connected to the negative electrode of the battery through the normally open contact of the BMS activation relay R5. The coil of the BMS activation relay R5 is connected in series in the series circuit. When applying this battery control and protection system, only when the power-off switch QF+ and QF—, the emergency stop switches SB0 and SB1, and the key switch SA1 are all closed, the BMS activation relay R5 will be attracted, and the negative electrode of the battery will be connected to the negative -VE terminal of the battery management system BMS, and the BMS will start to work; when one of the power-off switch QF+ and QF—, the emergency stop switches SB0 and SB1, and the key switch SA1 is disconnected, the BMS activation relay R5 does not work, and the battery management system BMS will not consume the electrical energy of the battery. Therefore, in this application, by making the negative electrode of the battery management system BMS be controlled by the external BMS activation relay R5, there is no need to add an external switch, so there is no need to consider the problem of power loss caused by forgetting to turn off the external switch, which is beneficial to the long-term storage of the battery.

[0020] Further, it further includes a charger, a charger activation relay R3, and a charger relay R1. The positive pole of the charger is respectively connected to the coil of the charger activation relay R3 and the normally open contact of the charger relay R1. The normally open contact of the charger relay R1 is also connected to the positive pole of the battery. The negative pole of the charger is connected to the negative pole of the battery management system through the normally open contact of the charger activation relay R3. The positive pole of the battery management system is connected to the positive pole of the charger through the normally open contact of the charger relay R1. The negative pole of the charger is also connected to the negative pole of the battery. After the charger is connected and loses power, the charger has a power output, the coil of the charger activation relay R3 is attracted, the negative - VE terminal of the battery management system BMS is conducted with the negative pole of the battery. At this time, the BMS activation relay R5 is powered on and works, the normally open contact of the charger relay R1 closes, and the charger starts to charge the battery. At the same time, the charger communicates with the battery management system BMS to monitor the battery charging status, avoid situations such as overcharging of the battery and too high internal temperature, protect the safety of the battery pack. When the charger is not connected to the mains, the battery management system BMS will not be activated, the charger relay R1 does not work, and it will not consume the battery power, so it will not cause the battery to run out of power.

[0021] Specifically, the control switch SA0 of the charger is connected in series in the series circuit, and the control switch SA0 can be connected in series between the positive - pole power - off switch QF+ of the battery and the key switch SA1.

[0022] In addition, it further includes a load relay R2. The battery management system BMS is connected to the negative pole of the battery through the coil of the load relay R2. The normally open contact of the load relay R2 is connected to the positive pole of the battery. That is, after the battery management system BMS works, the coil of the load relay R2 closes, and then the load relay R2 is connected to the positive pole of the battery, so as to realize the power output.

[0023] In addition, it further includes a main controller ECU and a power relay R4. The coil of the power relay R4 is connected in parallel with the coil of the BMS activation relay R5. The control switch SA0 of the charger is connected to the main controller ECU through the normally open contact of the power relay R4. That is, when the coils of the BMS activation relay R5 and the power relay R4 are simultaneously powered on and attracted, the normally open contact of the power relay R4 closes, so that the control switch SA0 of the charger is connected to the main controller. Secondly, the main controller ECU is also connected to the key switch. That is, after the key switch SA1 is closed, the main controller ECU is powered on.

[0024] An embodiment of the present invention also provides a scissor - type aerial work platform, including the battery control and protection system of any one of the above. The beneficial effects can be referred to the above battery control and protection system, and will not be elaborated here.

[0025] In the present specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the various embodiments can be referred to each other.

[0026] The above has introduced in detail a scissor-type aerial work platform and its battery control and protection system provided by the present invention. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A battery control and protection system, characterized in that, it includes: a battery, a battery management system, a BMS activation relay, a power-off switch, an emergency stop switch and a key switch that form a series circuit with the battery. The positive pole of the battery management system is connected to the positive pole of the battery, and the negative pole of the battery management system is connected to the negative pole of the battery through the normally open contact of the BMS activation relay. The coil of the BMS activation relay is connected in series in the series circuit; it further includes a charger, a charger activation relay and a charger relay. The positive pole of the charger is respectively connected to the coil of the charger activation relay and the normally open contact of the charger relay. The normally open contact of the charger relay is also connected to the positive pole of the battery. The negative pole of the charger is connected to the negative pole of the battery management system through the normally open contact of the charger activation relay. The positive pole of the battery management system is connected to the positive pole of the charger through the normally open contact of the charger relay. The negative pole of the charger is also connected to the negative pole of the battery. The coil of the charger relay is respectively connected to the normally open contact of the charger activation relay and the battery management system. After the charger is connected to the mains power, the charger outputs power. The coil of the charger activation relay is attracted, and the negative pole of the battery management system is conducted with the negative pole of the battery. At this time, the BMS activation relay is powered on and works, and the normally open contact of the charger relay closes, and the charger starts to charge the battery. At the same time, the charger communicates with the battery management system to monitor the battery charging status. When the charger is not connected to the mains power, the battery management system will not be activated, the charger relay does not work, and the battery power will not be consumed; The control switch of the charger is connected in series between the positive pole power-off switch of the battery and the key switch; it further includes a load relay. The battery management system is connected to the negative pole of the battery through the coil of the load relay. The normally open contact of the load relay is connected to the positive pole of the battery. After the battery management system works, the coil of the load relay closes, so that the load relay is connected to the positive pole of the battery, thereby realizing power output; it further includes a main controller and a power relay. The coil of the power relay is connected in parallel with the coil of the BMS activation relay. The control switch of the charger is connected to the main controller through the normally open contact of the power relay. When the coils of the BMS activation relay and the power relay are simultaneously attracted and powered on, the normally open contact of the power relay closes, so that the control switch of the charger is connected to the main controller.

2. The battery control and protection system according to claim 1, characterized in that, the control switch of the charger is connected in series in the series circuit.

3. The battery control and protection system according to claim 1, characterized in that, the main controller is further connected to the key switch.

4. A scissor-type aerial work platform, characterized in that, it includes the battery control and protection system according to any one of claims 1 to 3.

Images