Integrated lithium battery double-charging system for electric forklift

Abstract

The utility model discloses an integrated lithium battery double-charging system for an electric forklift, which comprises a slow charging circuit, a fast charging circuit, a whole vehicle working discharging circuit and a lithium battery pack, the input end of the slow charging circuit is connected with commercial power, the output end of the slow charging circuit is connected with a slow charging interface of the lithium battery pack, and the output end of the slow charging circuit is connected with a fast charging interface of the lithium battery pack. The input end of the fast charging circuit is connected with three-phase electricity, the output end of the fast charging circuit is connected with a fast charging interface of the lithium battery pack, and a discharging interface of the lithium battery pack is connected with the input end of the whole vehicle working discharging circuit. According to the utility model, fast and slow charging is realized, the use scheme diversification of the battery is greatly improved, and diversified use scenes are covered.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery charging systems for electric forklifts, in particular to an integrated lithium battery dual charging system for electric forklifts. Background Art

[0002] At present, the market customers have various demands for lithium battery charging. The commonly used ones are external fast charging chargers, and there are also low-cost slow charging chargers. The cost of external fast charging chargers is high. Although the price of slow charging chargers has dropped, the charging is slow. The existing charging methods are all single charging methods, which cannot support fast charging or slow charging at the same time, and cannot meet the diverse charging needs of customers. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems in the related art to a certain extent. To this end, one purpose of the utility model is to provide an integrated lithium battery dual charging system for electric forklifts, which realizes fast and slow dual charging, greatly improves the diversity of battery usage solutions, and covers a variety of usage scenarios.

[0004] According to the utility model, an integrated lithium battery dual charging system for an electric forklift includes a slow charging circuit, a fast charging circuit, a vehicle working discharge circuit and a lithium battery pack. The input end of the slow charging circuit is connected to the mains, the output end of the slow charging circuit is connected to the slow charging interface of the lithium battery pack, the input end of the fast charging circuit is connected to the three-phase electricity, the output end of the fast charging circuit is connected to the fast charging interface of the lithium battery pack, and the discharge interface of the lithium battery pack is connected to the input end of the vehicle working discharge circuit;

[0005] The slow charging circuit includes a slow charging machine, a slow charging input socket and a slow charging socket. The input end of the slow charging machine is connected to the mains through the slow charging input socket and the plug conversion line in sequence. The output end of the slow charging machine is connected to the slow charging socket. The positive end of the slow charging socket is connected to the positive charging input port of the lithium battery pack through the first charging contactor and the second charging contactor in sequence. The negative end of the slow charging socket is connected to the negative charging input port of the lithium battery pack through the third charging contactor. The output end of the second charging contactor is also connected to a slow charging BMS relay. The output end of the slow charging BMS relay is connected to the input end of the vehicle instrument through a conversion relay.

[0006] The second charging contactor is connected to the positive input terminal of the lithium battery DCDC, and the second charging contactor is also connected to the control port C1 of the lithium battery DCDC through the slow charging BMS relay. The third charging contactor is also connected to the negative input terminal of the lithium battery DCDC, and the output terminal of the lithium battery DCDC is connected to the BMS controller. The ports at both ends of the coil of the second charging contactor are respectively connected to the B3 port and the B4 port of the BMS controller.

[0007] Preferably, the fast charging circuit includes a fast charging charger with a built-in fast charging charger instrument and a fast charging socket, the input end of the fast charging charger is connected to the three-phase electricity, the output end of the fast charging charger is connected to the fast charging socket, the positive end of the fast charging socket is connected to the charging positive input port of the lithium battery pack through the first charging contactor 2 and the second charging contactor in sequence, the negative end of the fast charging socket is connected to the charging negative input port of the lithium battery pack through the third charging contactor, and the control port C1 of the lithium battery DCDC is also connected to an auxiliary power supply port for an external fast charging charger.

[0008] Preferably, the vehicle working discharge circuit includes a vehicle controller and a vehicle DCDC, the positive output end of the lithium battery pack is connected to the B+ port of the vehicle controller through the discharge contactor, the discharge socket and the total positive contactor in sequence, the positive output end of the lithium battery pack is also connected to the A3-KEY port of the vehicle controller through the emergency power-off switch and the key switch in sequence, the A1+ port of the vehicle controller and the A2- port of the vehicle controller are respectively connected to the two ends of the coil of the total positive contactor, the output end of the vehicle controller is connected to the input end of the traction motor, the output end of the total positive contactor is also connected to the input end of the vehicle DCDC, the output end of the vehicle DCDC is used for external electrical equipment, the output end of the lithium battery pack is also connected to the signal input end of the lithium battery DCDC, the output end of the lithium battery DCDC is connected to the input end of the BMS controller, the control port C1 of the lithium battery DCDC is connected to the output end of the lithium battery pack through the key switch and the emergency power-off switch in sequence, and the two end ports of the coil of the discharge contactor are respectively connected to the B1 port of the BMS controller and the B2 port of the BMS controller.

[0009] Preferably, the output end of the key switch is also connected to the input end of the vehicle instrument through a conversion relay.

[0010] Preferably, the slow charging charger, fast charging charger, BMS controller, vehicle instrument and vehicle controller are connected via a CAN communication bus.

[0011] The beneficial effects of the present invention are:

[0012] It realizes fast and slow dual charging, greatly improving the diversity of battery usage solutions and covering a variety of usage scenarios;

[0013] Realize convenient charging. There is no need to pull out the battery for charging the lithium battery, whether it is fast or slow charging. It can be directly connected to the lithium battery through the circuit structure, and the provided plug is connected to the charger for direct charging.

[0014] Define fast charging and slow charging labels through CAN protocol, and BMS matches different charging voltage and current curves;

[0015] In slow charging mode, the vehicle instrument is activated to display the battery status and charging information through the vehicle instrument to save costs. In fast charging mode, the information is displayed through the instrument that comes with the fast charging charger. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In the attached picture:

[0017] Figure 1 This is a circuit schematic diagram of an integrated lithium battery dual charging system for an electric forklift proposed by the utility model;

[0018] Figure 2 This is a schematic diagram of the installation structure of the integrated lithium battery dual charging system for the electric forklift proposed by the utility model;

[0019] Figure 3 The utility model proposed Figure 2 A top view of

[0020] Figure 4 The utility model proposed Figure 2 Side view of

[0021] Figure 5 The utility model is a schematic diagram of the structure of the integrated lithium battery dual charging system and the whole vehicle installation for the electric forklift.

[0022] In the figure: 1-charger, 2-first charging contactor, 3-second charging contactor, 4-discharge contactor, 5-emergency power off switch, 6-key switch, 7-conversion relay, 8-total positive contactor, 9-vehicle controller, 10-traction motor, 11-vehicle DCDC, 12-vehicle instrument, 13-BMS controller, 14-lithium battery DCDC, 15-lithium battery pack, 16-third charging contactor, 17-fast charging charger instrument, 18-slow charging BMS relay, 19-fast charging socket, 20-charging seat protective cover, 21-slow charging input socket, 22-discharge socket, 23-slow charging socket, 24-slow charging charger, 25-integrated lithium battery, 26-fast charging charger auxiliary power port. DETAILED DESCRIPTION

[0023] Reference Figure 1, an integrated lithium battery dual charging system for an electric forklift, comprising a slow charging circuit, a fast charging circuit, a vehicle working discharge circuit and a lithium battery pack 15, wherein the input end of the slow charging circuit is connected to the mains, the output end of the slow charging circuit is connected to the slow charging interface of the lithium battery pack 15, the input end of the fast charging circuit is connected to the three-phase electricity, the output end of the fast charging circuit is connected to the fast charging interface of the lithium battery pack 15, and the discharge interface of the lithium battery pack 15 is connected to the input end of the vehicle working discharge circuit;

[0024] The slow charging circuit includes a slow charging machine 24, a slow charging input socket 21 and a slow charging socket 23. The input end of the slow charging machine 24 is connected to the mains via the slow charging input socket 21 and the plug conversion line in sequence, the output end of the slow charging machine 24 is connected to the slow charging socket 23, the positive end of the slow charging socket 23 is connected to the positive charging input port of the lithium battery pack 15 via the first charging contactor 2 and the second charging contactor 3 in sequence, the negative end of the slow charging socket 23 is connected to the negative charging input port of the lithium battery pack 15 via the third charging contactor 16, the output end of the second charging contactor 3 is also connected to the slow charging BMS relay 18, and the output end of the slow charging BMS relay 18 is connected to the input end of the vehicle instrument 12 via the conversion relay 7;

[0025] The second charging contactor 3 is connected to the positive input terminal of the lithium battery DCDC14. The second charging contactor 3 is also connected to the control port C1 of the lithium battery DCDC14 through the slow charging BMS relay 18. The third charging contactor 16 is also connected to the negative input terminal of the lithium battery DCDC14. The output terminal of the lithium battery DCDC14 is connected to the BMS controller 13. The ports at both ends of the coil of the second charging contactor 3 are respectively connected to the B3 port and the B4 port of the BMS controller 13.

[0026] The fast charging circuit includes a fast charging charger with a built-in fast charging charger instrument 17 and a fast charging socket 19. The input end of the fast charging charger is connected to the three-phase electricity, and the output end of the fast charging charger is connected to the fast charging socket 19. The positive end of the fast charging socket 19 is connected to the charging positive input port of the lithium battery pack 15 through the first charging contactor 2 and the second charging contactor 3 in sequence, and the negative end of the fast charging socket 19 is connected to the charging negative input port of the lithium battery pack 15 through the third charging contactor 16. The control port C1 of the lithium battery DCDC14 is also connected to an auxiliary power port 26 for an external fast charging charger.

[0027] The vehicle working discharge circuit includes a vehicle controller 9 and a vehicle DCDC 11. The positive output end of the lithium battery pack 15 is connected to the B+ port of the vehicle controller 9 through the discharge contactor 4, the discharge socket 22 and the total positive contactor 8 in sequence. The positive output end of the lithium battery pack 15 is also connected to the A3-KEY port of the vehicle controller 9 through the emergency power-off switch 5 and the key switch 6 in sequence. The A1+ port of the vehicle controller 9 and the A2- port of the vehicle controller 9 are respectively connected to the two ends of the coil of the total positive contactor 8. The output end of the vehicle controller 9 is connected to the input end of the traction motor 10. The total positive contactor The output end of the device 8 is also connected to the input end of the vehicle DCDC11, and the output end of the vehicle DCDC11 is used for external electrical equipment. The output end of the lithium battery pack 15 is also connected to the signal input end of the lithium battery DCDC14. The output end of the lithium battery DCDC14 is connected to the input end of the BMS controller 13. The control port C1 of the lithium battery DCDC14 is connected to the output end of the lithium battery pack 15 through the key switch 6 and the emergency power-off switch 5 in sequence. The ports at both ends of the coil of the discharge contactor 4 are respectively connected to the B1 port of the BMS controller 13 and the B2 port of the BMS controller 13.

[0028] The output end of the key switch 6 is also connected to the input end of the vehicle instrument 12 through the conversion relay 7.

[0029] The slow charging charger 24, the fast charging charger, the BMS controller 13, the vehicle instrument 12 and the vehicle controller 9 are connected via a CAN communication bus.

[0030] Reference Figure 2-5 , which is a schematic diagram of the installation structure of an integrated lithium battery dual charging system for an electric forklift. The bolt-fixed assembly scheme is adopted, which can not only provide sufficient safety protection for high-voltage components, but also facilitate the disassembly and maintenance of the battery fast and slow charging systems, and a charging seat protective cover 20 is provided at the fast charging socket 19 and the slow charging input socket 21 for its protective function.

[0031] The working discharge principle of the whole vehicle:

[0032] When the vehicle is not charging, the V+V- of the conversion relay 7 is not energized; when the emergency power-off switch 5 and the key switch 6 are closed, the vehicle instrument 12 works, the BMS controller 13 controls the discharge contactor 4 to be pulled in, the vehicle controller 9 controls the total positive contactor 8 to be pulled in, the vehicle controller 9 and the vehicle DCDC11 power supply end are energized, so that the vehicle can be powered on and work;

[0033] Slow charging mode solution:

[0034] The slow charger 24 connects the power supply to the slow charger socket 23 through the plug conversion line, so that the slow charger 24 works after self-checking, and the output of the slow charger 24 is connected to the lithium battery pack 15 inside the integrated lithium battery 25 in the form of the slow charger socket 23 through the first charging contactor 2 and the third charging contactor 16, and is connected to the battery pack 15 through the second charging contactor 3. When the slow charger 24 is powered on, the slow charger 24 drives the lithium battery DCDC14 to work by driving the BMS relay 18, so that the BMS controller 13 is powered on; at the same time, the slow charger 24 drives the conversion relay 7 to work and close the normally open contact through the output of the V+ and V- port power supply, so that the vehicle instrument 12 is powered on, so the slow charger 24, the BMS controller 13 and the vehicle instrument 12 are all powered on, and the three control modules realize information exchange through the CAN bus. The slow charger 24 and the BMS controller 13 exchange charging information and determine the charger identification according to the charging protocol; for example, if Bit0 of the first byte Byte0 of ID: 0X1F0 is detected, Bit0=0 means it is a fast charger, and Bit0=1 means it is a slow charger. After identifying it as a slow charger, the BMS controller 13 sends the slow charger 24 a message such as Bit1 of the first byte Byte0 of ID: 0X1F0, Bit0=0, charging is allowed, and Bit0=1, charging is not allowed; if the slow charger 24 receives the permission to charge, it drives the first charging contactor 2 and the third charging contactor 16 to close, and at the same time the BMS controller 13 drives the second charging contactor 3 to close, thereby completing the slow charging. Finally, the slow charger 24 performs the corresponding slow charging according to the charging voltage and charging current request sent by the BMS controller 13.

[0035] Fast charging mode solution:

[0036] In the fast charging mode, after the fast charging charger output plug REMA plug or national standard charging gun is connected to the fast charging socket 19, after the fast charging charger is started, the fast charging charger controller and the BMS controller 13 perform CAN bus information exchange, and the key information is displayed on the fast charging charger instrument 17. The charger identification is determined according to the charging protocol; for example, if the Bit0 bit of the first byte Byte0 of ID: 0X1F0 is detected, Bit0=0, it is a fast charging charger, and Bit0=1, it is a slow charging charger. After identifying it as a fast charging charger, the 13BMS controller sends the Bit1 bit of the first byte Byte0 of ID: 0X1F0 to the fast charging charger, Bit0=0, charging is allowed, Bit0=1, charging is not allowed; if the fast charging charger receives the permission to charge, the first charging contactor 2 and the third charging contactor 16 inside the fast charging charger are driven to close, and at the same time, the BMS controller 13 drives the second charging contactor 3 to close, thereby completing the fast charging, and finally the fast charging charger performs the corresponding fast charging according to the charging voltage and charging current request sent by the BMS controller 13.

[0037] At the same time, the dual-charge integrated lithium battery has an increased safety design. When both the fast and slow chargers are connected, the BMS controller 13 detects a CAN bus error and does not allow charging.

Claims

1. An integrated lithium battery dual charging system for electric forklifts, characterized in that: It comprises a slow charging circuit, a fast charging circuit, a whole vehicle working discharge circuit and a lithium battery pack (15), wherein the input end of the slow charging circuit is connected to the mains, the output end of the slow charging circuit is connected to the slow charging interface of the lithium battery pack (15), the input end of the fast charging circuit is connected to three-phase electricity, the output end of the fast charging circuit is connected to the fast charging interface of the lithium battery pack (15), and the discharge interface of the lithium battery pack (15) is connected to the input end of the whole vehicle working discharge circuit; The slow charging circuit comprises a slow charging machine (24), a slow charging input socket (21) and a slow charging socket (23); the input end of the slow charging machine (24) is connected to the mains via the slow charging input socket (21) and a plug conversion line in sequence; the output end of the slow charging machine (24) is connected to the slow charging socket (23); the positive end of the slow charging socket (23) is connected to the positive charging input port of the lithium battery pack (15) via a first charging contactor (2) and a second charging contactor (3) in sequence; the negative end of the slow charging socket (23) is connected to the negative charging input port of the lithium battery pack (15) via a third charging contactor (16); the output end of the second charging contactor (3) is also connected to a slow charging BMS relay (18); the output end of the slow charging BMS relay (18) is connected to the input end of the vehicle instrument (12) via a conversion relay (7); The second charging contactor (3) is connected to the positive input terminal of the lithium battery DCDC (14); the second charging contactor (3) is also connected to the control port C1 of the lithium battery DCDC (14) via a slow charging BMS relay (18); the third charging contactor (16) is also connected to the negative input terminal of the lithium battery DCDC (14); the output terminal of the lithium battery DCDC (14) is connected to the BMS controller (13); and the ports at both ends of the coil of the second charging contactor (3) are respectively connected to the B3 port and the B4 port of the BMS controller (13).

2. The integrated lithium battery dual charging system for an electric forklift according to claim 1, characterized in that: The fast charging circuit comprises a fast charging machine with a fast charging machine meter (17) and a fast charging socket (19), wherein the input end of the fast charging machine is connected to a three-phase power supply, the output end of the fast charging machine is connected to the fast charging socket (19), the positive terminal of the fast charging socket (19) is connected to the positive charging input port of the lithium battery pack (15) through a first charging contactor (2) and a second charging contactor (3) in sequence, the negative terminal of the fast charging socket (19) is connected to the negative charging input port of the lithium battery pack (15) through a third charging contactor (16), and the control port C1 of the lithium battery DCDC (14) is also connected to an auxiliary power port (26) for externally connecting to the fast charging machine.

3. The integrated lithium battery dual charging system for an electric forklift according to claim 2, characterized in that: The vehicle working discharge circuit comprises a vehicle controller (9) and a vehicle DCDC (11); the positive output end of the lithium battery pack (15) is connected to the B+ port of the vehicle controller (9) through a discharge contactor (4), a discharge socket (22) and a total positive contactor (8) in sequence; the positive output end of the lithium battery pack (15) is also connected to the A3-KEY port of the vehicle controller (9) through an emergency power-off switch (5) and a key switch (6) in sequence; the A1+ port of the vehicle controller (9) and the A2- port of the vehicle controller (9) are respectively connected to the two ends of the coil of the total positive contactor (8); the output end of the vehicle controller (9) is connected to the input end of the traction motor (10); the total The output end of the positive contactor (8) is also connected to the input end of the vehicle DCDC (11), and the output end of the vehicle DCDC (11) is used for external power-consuming equipment. The output end of the lithium battery pack (15) is also connected to the signal input end of the lithium battery DCDC (14), and the output end of the lithium battery DCDC (14) is connected to the input end of the BMS controller (13). The control port C1 of the lithium battery DCDC (14) is connected to the output end of the lithium battery pack (15) through the key switch (6) and the emergency power-off switch (5) in sequence. The two end ports of the coil of the discharge contactor (4) are respectively connected to the B1 port of the BMS controller (13) and the B2 port of the BMS controller (13).

4. The integrated lithium battery dual charging system for an electric forklift according to claim 3, characterized in that: The output end of the key switch (6) is also connected to the input end of the vehicle instrument (12) via a conversion relay (7).

5. The integrated lithium battery dual charging system for an electric forklift according to claim 4, characterized in that: The slow-charging charger (24), the fast-charging charger, the BMS controller (13), the vehicle instrument (12) and the vehicle controller (9) are connected via a CAN communication bus.

Images