Anti-magnetic pressure maintaining electrical protection device of lithium battery fork truck

Abstract

This utility model discloses an anti-magnetic and voltage-maintaining electrical protection device for a lithium battery forklift, comprising: a DC-DC converter connected to the lithium battery, the output terminal of the DC-DC converter connected to a BMS, and the output terminal of the BMS connected to the vehicle's main contactor. The input terminal of a key switch is connected to the positive terminal of the lithium battery, and the output terminal of the key switch is connected to the DC-DC input of the lithium battery BMS and a relay. The DC-DC input of the lithium battery BMS and the battery together supply power to the lithium battery BMS, thereby energizing the vehicle's main contactor and enabling the vehicle to operate. This device is convenient, simple, and inexpensive to control, and can effectively prevent the lithium battery forklift from shutting down due to a strong magnetic field in the working environment.

Description

Technical Field

[0001] This utility model relates to the field of lifting, transporting and handling vehicles, and in particular to an antimagnetic and pressure-maintaining electrical protection device for lithium battery forklifts. Background Technology

[0002] During normal operation of the forklift, the DC-DC converter of the lithium battery BMS stops supplying power to the lithium battery BMS due to interference from the ambient magnetic field. The main contactor of the vehicle disconnects, causing the lithium battery forklift to stop working and become unable to operate normally, affecting work efficiency and the lifespan of the forklift battery. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies, the purpose of this utility model is to provide an antimagnetic and pressure-maintaining electrical protection device for lithium battery forklifts.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A magnetic shielding and voltage protection electrical protection device for a lithium battery forklift includes: a DC-DC converter connected to a lithium battery, the output terminal of the DC-DC converter being connected to a BMS, and the output terminal of the BMS being connected to a vehicle main contactor.

[0006] A key switch is installed between the lithium battery and the DC-DC converter.

[0007] A relay is installed between the DC-DC converter and the BMS.

[0008] The input terminal of the key switch is connected to the positive terminal of the lithium battery, and the output terminal of the key switch is connected to a DC-DC converter and a relay.

[0009] The relay is an 80-volt relay, and its normally open contact is connected to the battery.

[0010] The relay model is JD2912-DC80V40A.

[0011] The battery has the following parameters: 12V 10Ah.

[0012] The normally open contact of the main contactor is connected to the positive terminal of the lithium battery.

[0013] The beneficial effects of this utility model are as follows:

[0014] This utility model discloses an anti-magnetic and pressure-maintaining electrical protection device for lithium battery forklifts. The input terminal of the key switch is connected to the positive terminal of the lithium battery, and the output terminal of the key switch is connected to the DC-DC input of the lithium battery BMS and a relay. The DC-DC input of the lithium battery BMS and the battery together supply power to the lithium battery BMS, so that the main contactor of the whole vehicle is turned on and the whole vehicle is powered on and works. The device is convenient, simple and inexpensive to control, and can effectively prevent the lithium battery forklift from losing power and stopping when the magnetic field in the working environment becomes strong. Attached Figure Description

[0015] Figure 1 This is an electrical structure diagram of an anti-magnetic and pressure-maintaining electrical protection device for lithium battery forklifts. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0017] like Figure 1 As shown, an anti-magnetic and voltage-maintaining electrical protection device for a lithium battery forklift includes: a DC-DC converter 4 connected to a lithium battery 2, the output terminal of the DC-DC converter 4 connected to a BMS6, and the output terminal of the BMS6 connected to a vehicle main contactor 7. Preferably, a key switch 3 is installed between the lithium battery 2 and the DC-DC converter 4. A relay 5 is installed between the DC-DC converter 4 and the BMS6.

[0018] It should be noted that the BMS (battery management system) is responsible for detecting information such as battery voltage, charging and discharging current, and temperature. Based on the detected voltage, current, and temperature, it selects the charging and discharging method, determines whether equalization management needs to be activated, and protects the battery from abnormal conditions to ensure safe use and extend battery life.

[0019] The input terminal of the key switch is connected to the positive terminal of the lithium battery 2, and the output terminal of the key switch 3 is connected to the DC-DC4 input of the lithium battery BMS and the coil of the relay 5.

[0020] Preferably, the relay 5 is an 80-volt relay, and its normally open contact is connected to the battery 1. The normally open contact input of the 80-volt relay is connected to the positive terminal of the battery 1; the output of the DC-DC4 and the normally open contact output of the relay 5 are connected to the BMS6; the lithium battery BMS6 is connected to the coil of the vehicle's main contactor 7, and when the normally open contact of the main contactor 7 is closed, the lithium battery 2 supplies power to the vehicle, and the normally open contact of the main contactor 7 is connected to the positive terminal of the lithium battery 2.

[0021] For example, the relay 5 is model JD2912-DC80V40A, and the battery 1 has parameters of 12V10Ah.

[0022] The working process of this utility model:

[0023] When the key switch 3 is closed, the DC-DC4 of BMS6 is energized, BMS6 is energized, the main contactor 7 of the vehicle is energized, lithium battery 2 is connected, and the lithium battery forklift starts to work. At the same time, the coil of relay 5 is energized, and the normally open contact of relay 5 connects the 12-volt small battery and BMS6, ensuring dual power supply to BMS6. When the magnetic field in the working environment of the lithium battery forklift becomes strong, even if the DC-DC4 of the lithium battery BMS stops supplying power to BMS6 due to interference from the ambient magnetic field, the small battery 1 will continue to supply power to BMS6, preventing the entire lithium battery forklift from losing power and becoming unable to work after BMS6 is de-energized. It also ensures that the DC-DC4 of BMS can replenish the battery 1 in a timely manner when the magnetic field in the working environment of the lithium battery forklift becomes stronger or weaker, and the two power supply circuits complement each other.

[0024] It will be apparent to those skilled in the art that the above specific examples are merely preferred embodiments of this utility model. Therefore, any improvements or modifications that those skilled in the art may make to certain parts of this utility model still embody the principles of this utility model and achieve its purpose, and all fall within the scope of protection of this utility model.

Claims

1. A magnetic shielding and voltage-maintaining electrical protection device for a lithium battery forklift, characterized in that, include: A DC-DC converter (4) is connected to the lithium battery (2). The output terminal of the DC-DC converter (4) is connected to the BMS (6). The output terminal of the BMS (6) is connected to the vehicle main contactor (7).

2. The anti-magnetic and voltage-maintaining electrical protection device for lithium battery forklifts according to claim 1, characterized in that, A key switch (3) is installed between the lithium battery (2) and the DC-DC converter (4).

3. The anti-magnetic and voltage-maintaining electrical protection device for lithium battery forklifts according to claim 2, characterized in that, A relay (5) is installed between the DC-DC converter (4) and the BMS (6).

4. The anti-magnetic and voltage-maintaining electrical protection device for lithium battery forklifts according to claim 3, characterized in that, The input terminal of the key switch (3) is connected to the positive terminal of the lithium battery (2), and the output terminal of the key switch (3) is connected to the DC-DC converter (4) and the relay (5).

5. The anti-magnetic and voltage-maintaining electrical protection device for lithium battery forklifts according to claim 4, characterized in that, The relay (5) is an 80-volt relay, and the normally open contact of the relay (5) is connected to the battery (1).

6. The anti-magnetic and voltage-maintaining electrical protection device for lithium battery forklifts according to claim 5, characterized in that, The relay (5) is model JD2912-DC80V40A.

7. The anti-magnetic and voltage-maintaining electrical protection device for lithium battery forklifts according to claim 5, characterized in that, The battery (1) has the following parameters: 12V 10Ah.

8. The anti-magnetic and voltage-maintaining electrical protection device for lithium battery forklifts according to claim 5, characterized in that, The normally open contact of the main contactor (7) is connected to the positive terminal of the lithium battery (2).

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