High-voltage power distribution unit supporting switching of double battery packs for electric forklift and control method

Abstract

The invention discloses a high-voltage power distribution unit supporting switching of double battery packs for an electric forklift and a control method, and belongs to the technical field of new energy power systems of electric forklifts. The high-voltage power distribution unit supports the electric forklift to be provided with one or two battery packs, each battery pack corresponds to one high-voltage power distribution unit, and the power distribution units are integrally installed in a battery box body. The power distribution unit comprises core loops and components such as a discharging loop, a charging loop, a pre-charging loop and a heating loop, through cooperative control of the BMS and the VCU, discharging, charging and low-temperature heating of a single battery pack can be achieved, non-inductive switching (automatic switching of a master pack and a slave pack and no influence on operation) of double battery packs can also be achieved, and the double battery packs are not limited by capacity and can be independently charged and replaced. According to the electric forklift, the problems that a traditional electric forklift cannot give consideration to rapid charging and rapid battery replacement at the same time, and the compatibility of batteries with different capacities is poor are solved, and the use flexibility, operation continuity and environmental adaptability of the electric forklift are improved.

Description

Technical Field

[0001] This invention relates to the field of battery power supply and control for electric forklifts, specifically to a high-voltage power distribution unit and control method for electric forklifts that supports switching between dual battery packs. Background Technology

[0002] With the rapid development of the new energy industry, electric forklifts are increasingly widely used in warehousing, logistics, and manufacturing due to their advantages such as environmental friendliness and low noise. In practical applications, the battery requirements for electric forklifts are concentrated in two aspects: fast charging and fast battery swapping. On the one hand, some operational scenarios require continuous operation of the forklift, necessitating fast charging to shorten downtime; on the other hand, in some scenarios, charging facilities are insufficient, requiring fast battery swapping to ensure operational continuity.

[0003] However, traditional low-voltage platform electric forklifts mostly use large-capacity non-standard batteries, which can usually only meet one of the requirements of fast charging or fast battery swapping, and cannot meet both simultaneously. In addition, the battery system of traditional electric forklifts is highly dependent on battery capacity, and the incompatibility of batteries of different capacities is poor. This makes it impossible to flexibly adapt to the needs of different work intensities and durations, limiting the flexibility and adaptability of electric forklifts in use, and increasing the user's equipment procurement and maintenance costs. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a high-voltage power distribution unit and control method for electric forklifts that supports dual battery pack switching. By optimizing the structure and control logic of the power distribution unit, it realizes seamless switching, independent charging and flexible adaptation of dual battery packs, while meeting the needs of electric forklifts for fast charging and fast battery swapping, thereby improving the flexibility of equipment use and the continuity of operation.

[0005] This invention is achieved through the following technical solution: a high-voltage power distribution unit for electric forklifts that supports dual battery pack switching, comprising: Electric forklifts are equipped with one or two battery packs; Each battery pack is equipped with a high-voltage power distribution unit; The high-voltage power distribution unit is installed inside the battery box, which is then mounted on the electric forklift. The high-voltage power distribution unit can switch between the two battery packs at will to provide power output to the electric forklift.

[0006] Each battery pack is equipped with an independent discharge and charging interface, which can provide power output to the electric forklift independently and charge the battery pack independently. When the electric forklift is equipped with two battery packs, the two battery packs provide power output to the electric forklift independently. There is no capacity limitation for a single battery pack, and two battery packs with different capacities can be installed on the same electric forklift at the same time.

[0007] When the electric forklift is equipped with two battery packs, namely battery pack A and battery pack B, the two battery packs work independently. When the power of battery pack A is exhausted, the power is seamlessly switched to battery pack B through the high-voltage power distribution unit.

[0008] The high-voltage power distribution unit includes a discharge contactor A, a discharge contactor B, a charging contactor, a pre-charge contactor, a heating contactor A, a heating contactor B, a fuse A, a fuse B, a shunt, and a power diode. Fuse A, the charging contactor, the shunt, and the battery pack form a charging circuit. Fuse A is connected to the positive terminal of the battery pack, the shunt is connected to the negative terminal of the battery, the positive terminal of the charger is connected to the charging contactor, and the negative terminal of the charger is connected to the shunt. The charging heating contactor, fuse B, a heating film, and the charger form a charging heating circuit. The positive terminal of the charger is connected to the charging heating contactor. The contactors are connected, with the negative terminal of the charger connected to the heating film. The pre-charge contactor and the pre-charge resistor are connected in series to form a pre-charge circuit. The pre-charge circuit, discharge contactor A, and discharge contactor B are connected in parallel to form a discharge module. One end of the discharge module is connected to the positive terminal of the battery discharge circuit group, and the other end is connected to the positive terminal of the load of the electric forklift. The negative terminal of the load is connected to the negative terminal of the battery discharge circuit group. Fuse B is connected to the positive terminal of the load through the discharge heating contactor. The discharge heating contactor, discharge contactor A, discharge contactor B, and pre-charge contactor are all connected to the BMS, which controls the operation of each contactor.

[0009] Based on the control method of the high-voltage power distribution unit supporting dual battery pack switching for electric forklifts, discharge contactor A, discharge contactor B, and pre-charge contactor are all connected to the BMS, and the BMS controls the operation of each contactor. When the electric forklift is only equipped with battery pack A, the discharge process is as follows: After the electric forklift key switch is turned on and the BMS self-checks without faults, it closes the pre-charge contactor. When the voltage at the back end of discharge contactor A reaches the set pre-charge voltage, discharge contactor A is closed. After a delay, the pre-charge contactor is opened. At this time, the circuit of discharge contactor A is connected, and battery pack A supplies power to the forklift load. The discharge heating process is as follows: When the BMS detects that the battery temperature is lower than the preset temperature, it closes the discharge heating contactor and enters the discharge heating mode. The heating film starts to work. When the battery temperature reaches the preset temperature, the discharge heating contactor is opened.

[0010] When an electric forklift is equipped with two battery packs, battery pack A is the master pack and battery pack B is the slave pack. The discharge process is as follows: After the vehicle key switch is turned on, both the BMS of battery pack A and the BMS of battery pack B perform self-tests. Battery pack A is in the master pack working mode. After the self-test is fault-free, its BMS controls the internal pre-charge contactor and discharge contactor to perform discharge according to the discharge process described in claim 5. The discharge contactor A is closed, and battery pack A supplies power to the load. After the BMS of battery pack B is fault-free, it enters the sleep mode to reduce system power consumption. When battery pack A has a low battery level, the switching process begins: Battery pack A's BMS requests a battery pack switching command from the VCU. Upon receiving the command, the VCU sends a switching permission command to battery pack A's BMS at an appropriate time. Battery pack A's BMS wakes up battery pack B's BMS and simultaneously closes its internal discharge contactor B with a power diode circuit. After a delay, it opens its internal discharge contactor A and sends the contactor status to battery pack B's BMS. Battery pack B's BMS detects that battery pack A's discharge contactor A is open and discharge contactor B is engaged, then closes its own discharge contactor B with a power diode circuit and sends the contactor status to battery pack A's BMS. Battery pack A's BMS detects that battery pack B's discharge contactor B is engaged and then opens its own power diode circuit discharge contactor B. Battery pack B detects that battery pack A's contactor is properly open and engages its own discharge contactor A. After a delay, it opens its power diode circuit discharge contactor B. At this point, the power supply circuit switches from battery pack A to battery pack B, battery pack B switches to master mode, and battery pack A switches to slave mode. When battery pack B is no longer in use and power needs to be switched to battery pack A, the battery pack switching process is initiated, automatically switching to battery pack A for power, and battery pack B goes into sleep mode. The switching process is the reverse of the above process: Battery pack B's BMS requests a battery pack switching command from the VCU. After receiving the switching command, the VCU automatically selects an appropriate time to send a switching permission command to battery pack B's BMS. Upon receiving the switching permission command, battery pack B's BMS wakes up battery pack A's BMS, simultaneously closing the discharge contactor B with the power diode circuit inside battery pack B. After a delay, the discharge contactor A inside battery pack B is opened, and the contactor status is sent to battery pack A's BMS. Battery pack B's BMS then... After the MS detects that the discharge contactor A of battery pack B is open and the discharge contactor B is closed, it closes the discharge contactor B of the power diode circuit of battery pack A and sends the contactor status to the BMS of battery pack B. After the BMS of battery pack B detects that the discharge contactor B of battery pack A is closed, it opens the discharge contactor B of the power diode circuit of battery pack B. If battery pack A detects that the contactor of battery pack B is open and the contactor is open, it closes the discharge contactor A of battery pack A and opens the discharge contactor B of the power diode circuit after a delay. At this time, the power supply circuit switches from battery pack B to battery pack A. Battery pack A operates in master mode and battery pack B operates in slave mode, and battery pack A supplies power to the vehicle load.

[0011] When the battery packs need charging, the charging circuits of battery pack A and battery pack B are independent of each other, allowing individual charging of either battery pack A or battery pack B, or simultaneous charging of both battery packs using two chargers. When the BMS of battery pack A detects the connection of the charging gun, it hands with the charger according to the national standard charging procedure. After a successful handshake, the charging contactor of battery pack A closes, and the charging gun charges the battery module. When the BMS of battery pack B detects the connection of the charging gun, it hands with the charger according to the same national standard charging procedure. After a successful handshake, the charging contactor of battery pack B closes, and the charging gun charges the battery module.

[0012] The beneficial effects of this invention are: strong compatibility: it supports high-voltage power distribution units that support dual battery pack switching for single electric forklifts / high-voltage power distribution units that support dual battery pack switching for electric forklifts with flexible dual battery pack configuration. In dual battery pack mode, there is no capacity limitation, and battery packs of different capacities can be adapted simultaneously, reducing the adaptation cost of user equipment and improving scenario adaptability.

[0013] Seamless switching: The dual battery pack switching process is automatically controlled by the high-voltage power distribution unit (BMS) and the high-voltage power distribution unit (VCU) for electric forklifts that support dual battery pack switching. No manual operation is required, and power diodes ensure continuous power supply during switching, so as not to affect forklift operation, improving ease of use and work efficiency.

[0014] Combining fast charging and battery swapping: The battery pack has an independent charging port, supporting simultaneous charging of one or two packs for fast charging; it also supports independent replacement of a single pack for quick battery swapping, meeting the range assurance needs in different scenarios.

[0015] Good low-temperature adaptability: The integrated discharge heating circuit can automatically start the heating function in low-temperature environments, ensuring battery performance and service life, and expanding the range of applicable environments for the equipment.

[0016] High reliability: Through the design of fuses, pre-charging circuits, etc., the battery and circuit system are effectively protected to avoid overcurrent, overvoltage and other faults, thereby improving the stability and safety of system operation. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the single battery pack principle of the present invention; Figure 3 This is a schematic diagram illustrating the principle of the dual battery pack of the present invention; In the diagram: 1. Fuse B; 2. Charging heating contactor; 3. Discharging heating contactor; 4. Charging contactor; 5. Discharging contactor A; 6. Discharging contactor B; 7. Fuse; 8. Shunt; 9. Pre-charge resistor; 10. High-power diode. Detailed Implementation

[0019] like Figure 1 The high-voltage power distribution unit for the electric forklift shown, which supports dual battery pack switching, includes: Electric forklifts are equipped with one or two battery packs; Each battery pack is equipped with a high-voltage power distribution unit; The high-voltage power distribution unit is installed inside the battery box, which is then mounted on the electric forklift. The high-voltage power distribution unit can switch between the two battery packs at will to provide power output to the electric forklift.

[0020] Each battery pack is equipped with an independent discharge and charging interface, which can provide power output to the electric forklift independently and charge the battery pack independently. When the electric forklift is equipped with two battery packs, the two battery packs provide power output to the electric forklift independently. There is no capacity limitation for a single battery pack, and two battery packs with different capacities can be installed on the same electric forklift at the same time.

[0021] When the electric forklift is equipped with two battery packs, namely battery pack A and battery pack B, the two battery packs work independently. When the power of battery pack A is exhausted, the power is seamlessly switched to battery pack B through the high-voltage power distribution unit.

[0022] The high-voltage power distribution unit includes a discharge contactor A5, a discharge contactor B6, a charging contactor 4, a pre-charge contactor, a heating contactor A, a heating contactor B, a fuse A7, a fuse B1, a shunt 8, and a power diode 10. The fuse A7, charging contactor 4, shunt 8, and battery pack form a charging circuit. The fuse A7 is connected to the positive terminal of the battery pack, the shunt 8 is connected to the negative terminal of the battery, the positive terminal of the charger is connected to the charging contactor 4, and the negative terminal of the charger is connected to the shunt 8. The charging heating contactor 2, fuse B1, heating film, and charger form a charging heating circuit. The positive terminal of the charger is connected to the charging contactor 4. Electric heating contactor 2 is connected, and the negative terminal of the charger is connected to the heating film; the pre-charge contactor and pre-charge resistor 9 are connected in series to form a pre-charge circuit. The pre-charge circuit, discharge contactor A5, and discharge contactor B6 are connected in parallel to form a discharge module. One end of the discharge module is connected to the positive terminal of the battery discharge circuit group, and the other end is connected to the positive terminal of the load of the electric forklift. The negative terminal of the load is connected to the negative terminal of the battery discharge circuit group; fuse B1 is connected to the positive terminal of the load through discharge heating contactor 3. Discharge heating contactor 3, discharge contactor A5, discharge contactor B6, and pre-charge contactor are all connected to the BMS, and the BMS controls the operation of each contactor.

[0023] like Figure 2 As shown, when the electric forklift is equipped with only battery pack A, the discharge process is as follows: After the electric forklift key switch is turned on and the BMS self-tests without faults, the pre-charge contactor is closed. When the voltage at the back end of the discharge contactor A5 reaches the set pre-charge voltage, the discharge contactor A5 is closed. After a delay, the pre-charge contactor is opened. At this time, the circuit of the discharge contactor A5 is connected, and battery pack A supplies power to the forklift load. The discharge heating process is as follows: When the BMS detects that the battery temperature is lower than the preset temperature, the discharge heating contactor 3 is closed, and the discharge heating mode is entered. The heating film starts to work. When the battery temperature reaches the preset temperature, the discharge heating contactor 3 is opened.

[0024] like Figure 3 As shown, when the electric forklift is equipped with two battery packs, battery pack A is the master pack and battery pack B is the slave pack. The discharge process is as follows: After the vehicle key switch is turned on, both the BMS of battery pack A and the BMS of battery pack B perform self-tests. Battery pack A is in the master pack working mode. After the self-test is fault-free, its BMS controls the internal pre-charge contactor and discharge contactor to perform discharge according to the discharge process described in claim 5. The discharge contactor A5 is closed, and battery pack A supplies power to the load. After the BMS of battery pack B is fault-free, it enters the sleep mode to reduce system power consumption. When battery pack A has a low battery level, the switching process is initiated: Battery pack A's BMS requests a battery pack switching command from the VCU. Upon receiving the command, the VCU sends a switching permission command to battery pack A's BMS at an appropriate time. Battery pack A's BMS wakes up battery pack B's BMS and simultaneously closes the internal discharge contactor B6 with the power diode 10 circuit. After a delay, the internal discharge contactor A5 is opened, and the contactor status is sent to battery pack B's BMS. Battery pack B's BMS detects that battery pack A's discharge contactor A5 is open and discharge contactor B6 is engaged, and then closes... The discharge contactor B6 of the battery pack B with its own power diode 10 circuit is activated, and the contactor status is sent to the BMS of the battery pack A. After the BMS of the battery pack A detects that the discharge contactor B6 of the battery pack B is activated, it disconnects the discharge contactor B6 of its own power diode 10 circuit. After the battery pack B detects that the contactor of the battery pack A is disconnected normally, it activates its own discharge contactor A5, and after a delay, disconnects the discharge contactor B6 of the power diode 10 circuit. At this time, the power supply circuit is switched from the battery pack A to the battery pack B. The battery pack B switches to master mode, and the battery pack A switches to slave mode. When battery pack B is no longer in use and power needs to be switched to battery pack A, the battery pack switching process is initiated, automatically switching to battery pack A and putting battery pack B into sleep mode. The switching process is the reverse of the above: Battery pack B's BMS requests a battery pack switching command from the VCU. Upon receiving the command, the VCU automatically selects an appropriate time to send a switching permission command to battery pack B's BMS. Upon receiving the permission command, battery pack B's BMS wakes up battery pack A's BMS and simultaneously closes the discharge contactor B6 inside battery pack B, which has a power diode 10 circuit. After a delay, it opens the discharge contactor A5 inside battery pack B and sends the contactor status to battery pack A's BMS. Battery pack A's BMS detects this. After discharge contactor A5 of battery pack B opens and discharge contactor B6 closes, discharge contactor B6 of the power diode 10 circuit of battery pack A closes. At the same time, the contactor status is sent to the BMS of battery pack B. When the BMS of battery pack B detects that discharge contactor B6 of battery pack A is closed, it opens discharge contactor B6 of the power diode 10 circuit of battery pack B. When battery pack A detects that the contactor of battery pack B is open normally, it closes discharge contactor A5 of battery pack A and opens discharge contactor B6 of the power diode 10 circuit after a delay. At this time, the power supply circuit switches from battery pack B to battery pack A. Battery pack A operates in master mode and battery pack B operates in slave mode, with battery pack A supplying power to the vehicle load.

[0025] When the battery packs need charging, the charging circuits of battery pack A and battery pack B are independent of each other, allowing individual charging of either battery pack A or battery pack B, or simultaneous charging of both battery packs using two chargers. When the BMS of battery pack A detects the connection of the charging gun, it hands with the charger according to the national standard charging procedure. After a successful handshake, the charging contactor 4 of battery pack A closes, and the charging gun charges the battery module. When the BMS of battery pack B detects the connection of the charging gun, it hands with the charger according to the same national standard charging procedure. After a successful handshake, the charging contactor 4 of battery pack B closes, and the charging gun charges the battery module.

Claims

1. A high-voltage power distribution unit for electric forklifts that supports dual battery pack switching, characterized in that, include: Electric forklifts are equipped with one or two battery packs; Each battery pack is equipped with a high-voltage power distribution unit; The high-voltage power distribution unit is installed inside the battery box, which is then mounted on the electric forklift. The high-voltage power distribution unit can switch between the two battery packs at will to provide power output to the electric forklift.

2. The high-voltage power distribution unit for electric forklifts supporting dual battery pack switching according to claim 1, characterized in that: Each battery pack is equipped with an independent discharge and charging interface, which can provide power output to the electric forklift independently and charge the battery pack independently. When the electric forklift is equipped with two battery packs, the two battery packs provide power output to the electric forklift independently. There is no capacity limitation for a single battery pack, and two battery packs with different capacities can be installed on the same electric forklift at the same time.

3. The high-voltage power distribution unit for electric forklifts supporting dual battery pack switching according to claim 2, characterized in that: When the electric forklift is equipped with two battery packs, namely battery pack A and battery pack B, the two battery packs work independently. When the power of battery pack A is exhausted, the power is seamlessly switched to battery pack B through the high-voltage power distribution unit.

4. The high-voltage power distribution unit for electric forklifts supporting dual battery pack switching according to claim 1, characterized in that: The high-voltage power distribution unit includes a discharge contactor A, a discharge contactor B, a charging contactor, a pre-charge contactor, a heating contactor A, a heating contactor B, a fuse A, a fuse B, a shunt, and a power diode. Fuse A, the charging contactor, the shunt, and the battery pack form a charging circuit. Fuse A is connected to the positive terminal of the battery pack, the shunt is connected to the negative terminal of the battery, the positive terminal of the charger is connected to the charging contactor, and the negative terminal of the charger is connected to the shunt. The charging heating contactor, fuse B, a heating film, and the charger form a charging heating circuit. The positive terminal of the charger is connected to the charging heating contactor. The contactors are connected, with the negative terminal of the charger connected to the heating film. The pre-charge contactor and the pre-charge resistor are connected in series to form a pre-charge circuit. The pre-charge circuit, discharge contactor A, and discharge contactor B are connected in parallel to form a discharge module. One end of the discharge module is connected to the positive terminal of the battery discharge circuit group, and the other end is connected to the positive terminal of the load of the electric forklift. The negative terminal of the load is connected to the negative terminal of the battery discharge circuit group. Fuse B is connected to the positive terminal of the load through the discharge heating contactor. The discharge heating contactor, discharge contactor A, discharge contactor B, and pre-charge contactor are all connected to the BMS, which controls the operation of each contactor.

5. A control method for a high-voltage power distribution unit supporting dual battery pack switching for an electric forklift, based on any one of claims 1-4, characterized in that: Discharge contactor A, discharge contactor B, and pre-charge contactor are all connected to the BMS, which controls the operation of each contactor. When the electric forklift is only equipped with battery pack A, the discharge process is as follows: After the electric forklift key switch is turned on and the BMS self-tests without faults, it closes the pre-charge contactor. When the voltage at the back end of discharge contactor A reaches the set pre-charge voltage, discharge contactor A closes again. After a delay, the pre-charge contactor opens, and the circuit of discharge contactor A is completed, supplying power to the forklift load. The discharge heating process is as follows: When the BMS detects that the battery temperature is lower than the preset temperature, it closes the discharge heating contactor, enters the discharge heating mode, and the heating film starts working. When the battery temperature reaches the preset temperature, the discharge heating contactor opens.

6. The control method for a high-voltage power distribution unit supporting dual battery pack switching for an electric forklift according to claim 5, characterized in that: When an electric forklift is equipped with two battery packs, battery pack A is the master pack and battery pack B is the slave pack. The discharge process is as follows: After the vehicle key switch is turned on, both the BMS of battery pack A and the BMS of battery pack B perform self-tests. Battery pack A is in the master pack working mode. After the self-test is fault-free, its BMS controls the internal pre-charge contactor and discharge contactor to perform discharge according to the discharge process described in claim 5. The discharge contactor A is closed, and battery pack A supplies power to the load. After the BMS of battery pack B is fault-free, it enters the sleep mode to reduce system power consumption. When battery pack A has a low battery level, the switching process is initiated: Battery pack A's BMS requests a battery pack switching command from the VCU. Upon receiving the command, the VCU sends a switching permission command to battery pack A's BMS at an appropriate time. Battery pack A's BMS then wakes up battery pack B's BMS and simultaneously closes the internal discharge contactor B with its power diode circuit. After a delay, the internal discharge contactor A is opened, and the contactor status is sent to battery pack B's BMS. After B's BMS detects that battery pack A's discharge contactor A is open and discharge contactor B is closed, it closes its own discharge contactor B with power diode circuit and sends the contactor status to battery pack A's BMS. After battery pack A's BMS detects that battery pack B's discharge contactor B is closed, it opens its own power diode circuit's discharge contactor B. After battery pack B detects that battery pack A's contactor is open normally, it closes its own discharge contactor A, and after a delay, opens the power diode circuit's discharge contactor B. At this time, the power supply circuit switches from battery pack A to battery pack B, battery pack B switches to master mode, and battery pack A switches to slave mode. When battery pack B is no longer in use and power needs to be switched to battery pack A, the battery pack switching process is initiated, automatically switching to battery pack A for power, and battery pack B goes into sleep mode. The switching process is the reverse of the above process: Battery pack B's BMS requests a battery pack switching command from the VCU. After receiving the switching command, the VCU automatically selects an appropriate time to send a switching permission command to battery pack B's BMS. Upon receiving the switching permission command, battery pack B's BMS wakes up battery pack A's BMS, simultaneously closing the discharge contactor B with the power diode circuit inside battery pack B. After a delay, the discharge contactor A inside battery pack B is opened, and the contactor status is sent to battery pack A's BMS. Battery pack B's BMS then... After the MS detects that the discharge contactor A of battery pack B is open and the discharge contactor B is closed, it closes the discharge contactor B of the power diode circuit of battery pack A and sends the contactor status to the BMS of battery pack B. After the BMS of battery pack B detects that the discharge contactor B of battery pack A is closed, it opens the discharge contactor B of the power diode circuit of battery pack B. If battery pack A detects that the contactor of battery pack B is open and the contactor is open, it closes the discharge contactor A of battery pack A and opens the discharge contactor B of the power diode circuit after a delay. At this time, the power supply circuit switches from battery pack B to battery pack A. Battery pack A operates in master mode and battery pack B operates in slave mode, and battery pack A supplies power to the vehicle load.

7. The control method for a high-voltage power distribution unit supporting dual battery pack switching for an electric forklift according to claim 5, characterized in that: When the battery packs need charging, the charging circuits of battery pack A and battery pack B are independent of each other, allowing individual charging of either battery pack A or battery pack B, or simultaneous charging of both battery packs using two chargers. When the BMS of battery pack A detects the connection of the charging gun, it hands with the charger according to the national standard charging procedure. After a successful handshake, the charging contactor of battery pack A closes, and the charging gun charges the battery module. When the BMS of battery pack B detects the connection of the charging gun, it hands with the charger according to the same national standard charging procedure. After a successful handshake, the charging contactor of battery pack B closes, and the charging gun charges the battery module.

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