A dual-battery charging system, a vehicle dual-battery charging and power supply system, and a vehicle

Abstract

The utility model relates to a kind of charging system for double battery, double battery charging power supply system for vehicle and vehicle, belong to battery charging control technical field.The system includes controller, the power battery charging circuit for charging power battery and the control battery charging circuit for charging control battery, controller power connection first relay coil and second relay coil, the normally open contact of first relay is connected in series in power battery charging circuit, the normally open contact of second relay is connected in series in control battery charging circuit;Controller is used to control the power-on and power-off of first relay coil and second relay coil, to control the charging circuit where the battery needing charging in power battery and control battery is in conduction state, the charging circuit where the battery not needing charging is in open state.The scheme controls the power-on and power-off of corresponding relay coil by controller, realizes the charging control of two batteries of power battery and control battery, effectively simplifies charging operation.

Description

Technical Field

[0001] This utility model relates to a dual-battery charging system, a dual-battery charging and power supply system for vehicles, and a vehicle, belonging to the field of battery charging control technology. Background Technology

[0002] The load of an electric work vehicle can be divided into two parts: power load and control load. The power load is used to realize the vehicle's driving functions such as walking and steering; the control load is more varied and depends on the functions of the electric work vehicle. Different work vehicle functions use different control loads, which include functional modules, such as bird deterrence modules for scare away birds and FOD modules for detecting and identifying foreign objects in specific scenarios.

[0003] To avoid impacting the chassis's range, separate batteries are used to power the control load and the power load. The control load is powered by a control battery, while the power load is powered by a power battery. For vehicles using this dual-battery configuration, separate indicator lights and charging ports are required on the vehicle body for both the control and power batteries, and each battery also needs its own independent charger. During charging, because the two batteries charge at different rates, operators must constantly monitor the process and manually disconnect the charging circuit of the battery that is fully charged first to prevent overcharging. The charging operation is relatively cumbersome, significantly increasing maintenance costs and training costs for maintenance personnel. Utility Model Content

[0004] The purpose of this utility model is to provide a dual-battery charging system to solve the problem of cumbersome charging operation of existing dual batteries; to provide a dual-battery charging and power supply system for vehicles to solve the problem of cumbersome charging operation of existing dual batteries in vehicles; and to provide a vehicle to solve the problem of cumbersome charging operation of existing dual batteries in vehicles.

[0005] To achieve the above objectives, the solution of this utility model includes:

[0006] This utility model discloses a dual-battery charging system, which includes a controller, a power battery charging circuit for charging a power battery, and a control battery charging circuit for charging a control battery. The controller is powered and connected to a first relay coil and a second relay coil. The power battery charging circuit has a normally open contact of the first relay connected in series, and the control battery charging circuit has a normally open contact of the second relay connected in series.

[0007] The controller is used to control the gain and loss of power of the first relay coil and the second relay coil, so as to control the power battery and the charging circuit of the battery that needs to be charged to be in a conducting state, and the charging circuit of the battery that does not need to be charged to be in a disconnected state.

[0008] Furthermore, the controller is used to communicate with the battery management system of the power battery to obtain the power battery's state of charge.

[0009] In the power battery charging circuit, the two ends of the first charging interface for connecting to an external charging power source are also connected to a first detection relay coil for detecting the input state of the first charging interface. When the charging power source is connected at the first charging interface, the first detection relay coil is energized. The normally open contact of the first detection relay is connected to the signal input terminal of the controller. When the normally open contact of the first detection relay is closed, the signal input terminal of the controller receives a high level, indicating that the input state of the first charging interface is energized. When the normally open contact of the first detection relay is open, the signal input terminal of the controller receives a low level, indicating that the input state of the first charging interface is de-energized.

[0010] The controller is used to energize the first relay coil when it detects that the input state of the first charging interface is energized and the power battery is depleted.

[0011] Furthermore, the controller is used to communicate with the battery management system that controls the battery in order to obtain the battery's state of charge.

[0012] The two ends of the second charging interface in the battery charging circuit, which is used to connect to an external charging power supply, are also connected to a second detection relay coil for detecting the input state of the second charging interface. When the charging power is turned on at the second charging interface, the second detection relay coil is energized. The normally open contact of the second detection relay is connected to the signal input terminal of the controller. When the normally open contact of the second detection relay is closed, the signal input terminal of the controller receives a high level, indicating that the input state of the second charging interface is energized. When the normally open contact of the second detection relay is open, the signal input terminal of the controller receives a low level, indicating that the input state of the second charging interface is de-energized.

[0013] The controller is used to energize the second relay coil when it detects that the input state of the second charging interface is energized and the charge state of the control battery is depleted.

[0014] Furthermore, the controller is used to connect to the control battery, so that the controller is powered by the control battery to form a controller charging circuit;

[0015] The normally open contact of the third relay is connected in series in the control battery charging circuit, and the coil of the third relay is connected to both ends of the second charging interface.

[0016] The controller charging circuit has a normally open contact of a fourth relay connected in series. The two ends of the control battery are connected to a starting branch for starting the control battery power supply. The starting branch has a fourth relay coil connected in series and a starting switch for simultaneously starting the power battery and the control battery power supply. By closing the starting switch, the controller charging circuit is turned on, and then the control battery power is supplied to the controller to start the controller.

[0017] The normally open contact of the third relay in the control battery charging circuit is connected in parallel with the normally open contact of the fourth relay in the controller charging circuit. This allows the normally open contact of the fourth relay to be bypassed when it is in the open state through the closing of the normally open contact of the third relay, and the normally open contact of the third relay to be bypassed when it is in the open state through the closing of the normally open contact of the fourth relay. This enables the switching of power supply from the external charging power source in the control battery charging circuit to the control battery and the control load including the controller, and the switching of power supply from the control battery to the control load including the controller.

[0018] Furthermore, the first charging interface and the second charging interface are the same, and correspondingly, the first detection relay coil and the second detection relay coil are the same, and the normally open contact of the first detection relay and the normally open contact of the second detection relay are also the same.

[0019] Furthermore, when both the first charging interface in the power battery charging circuit and the second charging interface in the control battery charging circuit receive AC power, a charger adapted to the battery for AC-to-DC conversion is connected in series in both the power battery charging circuit and the control battery charging circuit.

[0020] Furthermore, the controller has a CAN interface, which enables communication between the battery management systems of the power battery and the control battery and the controller via the CAN bus.

[0021] This utility model discloses a dual-battery charging and power supply system for vehicles, including a power battery for supplying power to a power load, a control battery for supplying power to a control load including a controller, and a dual-battery charging system, wherein the dual-battery charging system adopts the dual-battery charging system described above.

[0022] Furthermore, the control battery power supply is connected to the controller to form a controller charging circuit. The controller charging circuit is also equipped with a first air switch and / or a negative switch to prevent the control battery from running out of power. The control battery charging circuit is also equipped with a second air switch.

[0023] The present invention relates to a vehicle, including a power load, a control load other than the controller, and a dual-battery charging and power supply system for the vehicle. The dual-battery charging and power supply system for the vehicle adopts the dual-battery charging and power supply system for the vehicle as described above. The control load other than the controller is connected in parallel with the controller, so as to realize the connection of the control battery power supply to the control load other than the controller.

[0024] Furthermore, the dual-battery charging power supply system for vehicles also includes a fifth relay. In addition to the controller, the control load is connected in parallel with the controller after the normally open contact of the fifth relay is connected in series. The controller power supply is connected to the coil of the fifth relay.

[0025] Furthermore, the controller is also used to receive the key switch signal corresponding to the control load, and control the fifth relay coil to be energized according to the state of the key switch signal, so as to realize the start and stop of the control load.

[0026] The beneficial effects of this utility model are:

[0027] This invention is groundbreaking, providing a dual-battery charging system. The controller in this system controls the energization and de-energization of a first relay coil and a second relay coil to maintain the charging circuit of the power battery and the battery requiring charging in a conductive state, while keeping the charging circuit of the battery not requiring charging in a disconnected state. Specifically, when the power battery needs charging, the coil of the first relay is energized, closing the normally open contact of the first relay connected in series in the power battery charging circuit, thus making the power battery charging circuit conductive and enabling charging. When the power battery does not need charging, the coil of the first relay is de-energized, opening the normally open contact of the first relay connected in series in the power battery charging circuit, thus making the power battery charging circuit disconnected and preventing charging. Similarly, when the control battery needs to be charged, the coil of the second relay is energized, causing the normally open contact of the second relay connected in series in the control battery charging circuit to close, thereby putting the control battery charging circuit into a conducting state and realizing the charging of the control battery; when the control battery does not need to be charged, the coil of the second relay is de-energized, causing the normally open contact of the second relay connected in series in the control battery charging circuit to open, thereby putting the control battery charging circuit into a disconnected state and putting the control battery into a non-charging state.

[0028] Compared to the constant monitoring by operators and the one-to-one charging operation between the battery and its matching charging circuit, this solution can control the charging of both the power battery and the control battery by controlling the energization and de-energization of the corresponding relay coil through the controller, effectively simplifying the charging operation. Attached Figure Description

[0029] Figure 1 This is a circuit diagram for a vehicle's dual-battery charging power supply.

[0030] Figure 2 This is a circuit diagram for a different type of vehicle that uses a dual-battery charging system. Detailed Implementation

[0031] To address the problems in the background technology, this utility model employs a controller to keep the charging circuit of the battery that needs charging in a conducting state and the charging circuit of the battery that does not need charging in a disconnected state, thereby realizing dual-battery charging control in the vehicle. This effectively simplifies the charging operation, allows for timely charging and timely stopping of charging, effectively prevents overcharging and over-discharging, improves battery life, and significantly reduces maintenance costs and maintenance personnel training costs.

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] One implementation method for a vehicle:

[0034] A vehicle includes a power load, a control load other than a controller, and a dual-battery charging power supply system for the vehicle.

[0035] A dual-battery charging power supply system for vehicles, reference Figure 1 and Figure 2 It includes a controller, a power battery for supplying power to the power load, a power battery charging circuit for charging the power battery, a control battery for supplying power to the control load including the controller, and a control battery charging circuit for charging the control battery.

[0036] Among them, the control loads other than the controller are connected in parallel with the controller to realize the control battery power supply to the control loads other than the controller.

[0037] The controller is connected to the coil of the first relay K1 and the coil of the second relay K2. The normally open contact of the first relay K1 is connected in series in the power battery charging circuit, and the normally open contact of the second relay K2 is connected in series in the control battery charging circuit.

[0038] The controller controls the energization and de-energization of the first and second relay coils to ensure that the charging circuits of the power battery and the batteries within it that require charging are in a conductive state, while the charging circuits of the batteries that do not require charging are in a disconnected state. Specifically, when the power battery needs charging, the coil of the first relay is energized, causing the normally open contact of the first relay connected in series in the power battery charging circuit to close, thus making the power battery charging circuit conductive and enabling charging. When the power battery does not need charging, the coil of the first relay is de-energized, causing the normally open contact of the first relay connected in series in the power battery charging circuit to open, thus making the power battery charging circuit disconnected and preventing charging. Similarly, when the control battery needs to be charged, the coil of the second relay is energized, causing the normally open contact of the second relay connected in series in the control battery charging circuit to close, thereby putting the control battery charging circuit into a conducting state and realizing the charging of the control battery; when the control battery does not need to be charged, the coil of the second relay is de-energized, causing the normally open contact of the second relay connected in series in the control battery charging circuit to open, thereby putting the control battery charging circuit into a disconnected state and putting the control battery into a non-charging state.

[0039] Specifically, the controller is used to communicate with the battery management system of the power battery to obtain the power battery's state of charge.

[0040] In the power battery charging circuit, the two ends of the first charging interface used for external charging power supply are also connected to a first detection relay coil for detecting the input state of the first charging interface, so that the first detection relay coil is energized when the charging power supply is connected at the first charging interface. The normally open contact of the first detection relay is connected to the signal input terminal of the controller, so that when the normally open contact of the first detection relay is closed, the signal input terminal of the controller receives a high level, and considers the input state of the first charging interface to be energized; when the normally open contact of the first detection relay is open, the signal input terminal of the controller receives a low level, and considers the input state of the first charging interface to be de-energized.

[0041] The controller is used to energize the first relay coil when it detects that the input state of the first charging interface is energized and the power battery is depleted.

[0042] The controller is configured to energize the first relay coil only when it detects that the input state of the first charging interface is energized, so as to avoid the situation where the controller fails to control the charging of the power battery when the first charging interface, which is used for external charging power in the power battery charging circuit, is not connected to the charging power.

[0043] This solution employs a controller that determines whether the power battery needs charging based on its state of charge. When the power battery requires charging and the first charging interface in the power battery charging circuit is energized, the first relay coil is energized, putting the charging circuit containing the power battery into a conductive state. Conversely, when the charging circuit is conductive but the power battery does not require charging, the first relay coil is de-energized, putting the charging circuit into a disconnected state. This achieves control over the charging of the vehicle's power battery, effectively simplifying charging operations, enabling timely charging and stopping, preventing overcharging and over-discharging, extending the power battery's lifespan, and significantly reducing maintenance costs and training costs for maintenance personnel.

[0044] Specifically, the controller is used to communicate with the battery management system that controls the battery in order to obtain the battery's state of charge.

[0045] The second charging interface in the battery charging circuit, used for connecting an external charging power source, is also connected to two ends with a second detection relay coil for detecting the input state of the second charging interface. When the charging power is connected to the second charging interface, the second detection relay coil is energized. The normally open contact of the second detection relay is connected to the signal input terminal of the controller. When the normally open contact of the second detection relay is closed, the controller's signal input terminal receives a high level, indicating that the input state of the second charging interface is energized. When the normally open contact of the second detection relay is open, the controller's signal input terminal receives a low level, indicating that the input state of the second charging interface is de-energized.

[0046] The controller is used to energize the second relay coil when it detects that the input state of the second charging interface is energized and the charge state of the control battery is depleted.

[0047] The controller energizes the second relay coil only when it detects that the input state of the second charging interface is energized, so as to avoid the situation where the controller fails to control the battery charging when the charging power is not connected at the second charging interface used for external charging power in the battery charging circuit.

[0048] This solution employs a controller that determines whether the control battery needs charging based on its charge status. When the control battery requires charging and the input state of the second charging interface in the control battery charging circuit (used for external charging) is energized, the second relay coil is energized, putting the charging circuit containing the control battery into a conductive state. Conversely, when the charging circuit is conductive but the control battery does not require charging, the second relay coil is de-energized, putting the charging circuit into a disconnected state. This achieves control over the charging of the control battery in the vehicle, effectively simplifying charging operations, enabling timely charging and stopping, effectively preventing overcharging and over-discharging, improving control battery life, and significantly reducing maintenance costs and training costs for maintenance personnel.

[0049] More specifically, the controller is used to communicate with the battery management system of the power battery and the control battery to obtain the state of charge of the power battery and the control battery, and to determine whether the two batteries need to be charged based on the state of charge of the power battery and the control battery. Then, based on the determination result, it controls whether the first relay coil and / or the second relay coil are energized, so as to control the charging circuit of the battery that needs to be charged to be in a conducting state and the charging circuit of the battery that does not need to be charged to be in a disconnected state.

[0050] The system's controller determines whether the power battery and control battery need charging based on the acquired state of charge (SOC) of both. Based on this determination, it controls the charging circuit to either: energize only the coil of the first relay, energize only the coil of the second relay, or energize both coils. This ensures the charging circuit for the battery requiring charging is active, while the charging circuit for the battery not requiring charging is disconnected. Compared to the constant monitoring by operators and the one-to-one charging operation between each battery and its corresponding charging circuit, this solution simplifies the charging process by simultaneously controlling the charging of both batteries. It also allows for timely charging based on the SOC of both batteries, preventing over-discharge and overcharging, thus significantly reducing maintenance and personnel training costs.

[0051] This invention employs a controller that determines whether the power battery and control battery need charging based on their charge status. This controller keeps the charging circuit of the battery that needs charging in a conducting state and the charging circuit of the battery that does not need charging in a disconnected state, thereby achieving dual-battery charging control in the vehicle. This effectively simplifies the charging operation, allows for timely charging and timely stopping of charging, effectively prevents overcharging and over-discharging, improves battery life, and significantly reduces maintenance costs and training costs for maintenance personnel.

[0052] The battery status includes the battery status change and the actual battery level. When the battery status change is that the battery level decreases over time, it is considered that the battery is supplying power and is in a non-charging state. When the battery status change is that the battery level increases over time, it is considered that the battery is charging and is in a charging state.

[0053] Specifically, the system determines whether the two batteries need charging based on their state of charge and a comparison of their actual charge levels with the set low and full charge thresholds. The low charge threshold is set based on the battery's charge level at the point of near over-discharge, and the full charge threshold is set based on the battery's charge level at the point of near over-charge.

[0054] When the battery is not charging and the comparison result shows that the actual battery charge is less than the set low charge threshold, the battery is considered to need to be charged as soon as possible to avoid over-discharge. When the battery is charging and the comparison result shows that the actual battery charge is greater than or equal to the set full charge threshold, the battery is considered not to need to be charged and charging should be stopped as soon as possible to avoid overcharging.

[0055] When only the power battery needs charging, the controller controls the first relay coil to be energized and the second relay coil to be de-energized. This causes the normally open contact of the first relay, which is connected in series in the power battery charging circuit, to close and the normally open contact of the second relay, which is connected in series in the control battery charging circuit, to open. This connects the power battery charging circuit and disconnects the control battery charging circuit, so that the power battery is in a charging state and the control battery is in a non-charging state.

[0056] When only the control battery needs charging, the controller de-energizes the first relay coil and energizes the second relay coil. This causes the normally open contact of the first relay, which is connected in series in the power battery charging circuit, to open, and the normally open contact of the second relay, which is connected in series in the control battery charging circuit, to close. This disconnects the power battery charging circuit and connects the control battery charging circuit, leaving the power battery in a non-charging state and the control battery in a charging state.

[0057] When both the power battery and the control battery need to be charged, the controller is used to energize the first and second relay coils, thereby closing the normally open contacts of the first relay connected in series in the power battery charging circuit and the normally open contacts of the second relay connected in series in the control battery charging circuit, so that both the power battery charging circuit and the control battery charging circuit are connected, and both the power battery and the control battery are in a charging state.

[0058] When neither the power battery nor the control battery needs charging, the controller de-energizes the first and second relay coils, thereby opening both the normally open contacts of the first relay connected in series in the power battery charging circuit and the normally open contacts of the second relay connected in series in the control battery charging circuit. This disconnects both the power battery charging circuit and the control battery charging circuit, leaving both the power battery and the control battery in a non-charging state.

[0059] Specifically, the controller is used to connect to the control battery so that the controller is powered by the control battery to form a controller charging circuit.

[0060] The normally open contact of a third relay is connected in series in the control battery charging circuit, and the coil of the third relay is connected to both ends of the second charging interface.

[0061] The controller charging circuit has a normally open contact of a fourth relay connected in series. The two ends of the control battery are connected to a starting branch for starting the control battery power supply. The starting branch has a fourth relay coil connected in series and a starting switch for simultaneously starting the power battery and the control battery power supply. By closing the starting switch, the controller charging circuit is turned on, and then the control battery power is supplied to the controller to start the controller.

[0062] When the control battery's power supply and charging are shared, the normally open contact of the third relay connected in series in the control battery charging circuit is connected in parallel with the normally open contact of the fourth relay connected in series in the controller charging circuit. This bypasses the normally open contact of the fourth relay (which is in the open state) by closing the normally open contact of the third relay, and vice versa. This allows for switching between supplying power from the external charging power source to the control battery and control loads (including the controller), and between the control battery supplying power to the control loads (including the controller). To improve the control battery charging speed, the external charging power source can supply power only to the controller and the control battery.

[0063] Specifically, to simplify the circuit, the first charging interface and the second charging interface are the same.

[0064] Assuming that the first charging interface and the second charging interface are the same, correspondingly, the first detection relay coil and the second detection relay coil are the same, and the normally open contact of the first detection relay and the normally open contact of the second detection relay are also the same.

[0065] Specifically, the controller is connected to the battery power supply to form a controller charging circuit. The controller charging circuit also has a normally open contact of a fourth relay connected in series. The two ends of the control battery power supply side are also connected to a starting branch for starting the control battery power supply. The starting branch has a fourth relay coil and a starting switch for simultaneously starting the power battery and the control battery power supply connected in series. By closing the starting switch, the controller charging circuit is turned on, and then the controller is started by supplying power to the controller through the control battery.

[0066] Specifically, when both the first charging interface in the power battery charging circuit and the second charging interface in the control battery charging circuit receive AC power, the power battery charging circuit and the control battery charging circuit are respectively connected in series with a charger adapted to their battery for AC-to-DC conversion.

[0067] In another implementation, when both the first charging interface in the power battery charging circuit and the second charging interface in the control battery charging circuit receive DC power, an AC-to-DC charger adapted to the corresponding battery is provided by the external charging pile that serves as the charging power source.

[0068] Specifically, the controller has a CAN interface, which enables communication between the battery management systems of the power battery and the control battery and the controller via the CAN bus. Of course, the controller can also achieve communication between the battery management systems of the power battery and the control battery and the controller via other communication methods.

[0069] Specifically, the controller is connected to the battery power supply to form a controller charging circuit. The controller charging circuit is also equipped with a first air switch (referred to as an air switch) for overload and short circuit protection and / or a negative switch for preventing the control battery from running out of power.

[0070] Specifically, a second air switch is also provided in the control battery charging circuit to realize overload and short circuit protection.

[0071] Specifically, the dual-battery charging power supply system for vehicles also includes a fifth relay. Control loads other than the controller are connected in parallel with the controller after the normally open contact of the fifth relay is connected in series. The controller power supply is connected to the coil of the fifth relay so as to control the charging of control loads other than the controller through the controller.

[0072] Specifically, the controller is also used to receive key switch signals corresponding to control loads other than the controller itself, and to control the fifth relay coil to be energized according to the state of the key switch signals, thereby realizing the start and stop of the control load. The control load can be a functional module or an indicator module. Functional modules include bird-repelling modules for scaring away birds and FOD modules for detecting and identifying foreign objects in specific scenarios, etc. Indicator modules include indicator lights for indicating charging status such as fully charged, charging in progress, and low battery. The specific control load can be selected according to the actual required functions.

[0073] Specifically, in addition to the controller, the normally open contact of the restart relay is also connected in series with the normally open contact of the fifth relay on the branch of the control load connected in series with the controller. The coil of the restart relay is connected in series with the reset switch and then in parallel with the controller to realize the connection of the control battery power supply to the restart relay coil. By closing the reset switch, the charging circuit of the control load connected in series with the normally open contact of the restart relay is opened and closed.

[0074] The following example uses a shared control battery with the same power supply and charging side, the same first and second charging interfaces, the same first and second detection relay coils, the same normally open contacts for the first and second detection relays, and AC power received by the shared charging interface for both batteries. Figure 1 and Figure 2 To provide a more detailed description of a vehicle.

[0075] For ease of understanding in the following text, the following will be... Figure 1 and Figure 2 The meanings of the relevant symbols are explained below:

[0076] SB1 is a start switch for simultaneously starting the power battery and controlling the battery power supply; SB2 is a reset switch; S1 is the key switch for functional module 1; S2 is the key switch for functional module 2; K1 is the power battery charging relay as the first relay; K2 is the control battery charging relay as the second relay; K3 is the functional module 1 charging relay as the fifth relay; K4 is the functional module 2 charging relay as the fifth relay; K5 is the functional module 2 restart relay; K6 is the functional module 3 charging relay as the fifth relay; K7 is the control battery output start relay as the fourth relay; K8 is the battery low / charging indicator light activation relay; K9 is the battery charging complete indicator light activation relay; K11 is the third relay; K12 is a detection relay; QF is an air switch; HL1 is the low / charging indicator light; HL2 is the charging complete indicator light; CAN-H is the CAN bus high data line; CAN-L is the CAN bus low data line.

[0077] like Figure 1As shown, to simplify the charging operation of dual-battery systems (control battery and power battery) used in vehicles, a vehicle applicable to electric work vehicles is provided that only requires one AC power input. That is, the charging interface shared by the power battery and control battery is connected to AC power. Figure 1 The vehicle body charging interface is connected to AC220V. The equipped controller monitors the status of each battery in real time and controls the on / off of the battery charging circuit on the vehicle body. It also inputs corresponding signals to the controller according to the function selection buttons connected to the vehicle body. The controller performs logical judgment based on the signals received and the battery status, controls the power supply of each functional module on the vehicle body, and outputs the results such as low power and full power through indicator lights.

[0078] like Figure 2 As shown, different Figure 1 The charging interface shared by the power battery and the control battery is connected to direct current (DC). Figure 2 The vehicle's charging interface connects to external DC power. The DC power supplied to the charging interface is the result of AC power being converted by the chargers corresponding to the two batteries.

[0079] This solution utilizes two batteries in the vehicle: one powering the load and the other powering the control load. Both batteries are equipped with charging circuits and controllers. The controller monitors the status of both batteries in real time and controls the corresponding status indicator lights. It also works in conjunction with a start switch SB1, a reset switch SB2, and various relays to control the power supply to the corresponding functional modules and / or indicator modules. During charging, the controller shuts off the power supply to the functional modules and controls the opening and closing of the corresponding charging circuits based on the status of the two batteries, preventing overcharging and undervoltage. This solution allows a single charging port on the vehicle body to charge both batteries simultaneously.

[0080] The vehicle includes a power battery that supplies power to the power load. The power battery is connected in series to the output terminal of its matching charger 1. The input terminal of the charger 1 is connected in series to the vehicle body charging interface. The phase line of the input terminal of the charger 1 is connected to the normally open contact of the AC relay K1, which serves as the first relay. The other end of the normally open contact of K1 is connected to the phase line of the vehicle body charging interface.

[0081] Charger 2 is compatible with the control battery, which supplies power to the control load. It is connected in parallel to the vehicle's charging interface with the input terminal of Charger 1. The live wire of Charger 2's input terminal is connected to the normally open contact of AC relay K2 (which acts as the second relay), and the other end of K2's normally open contact is connected to the live wire of the vehicle's charging interface. A third relay, K11, is connected to both the live and neutral wires of the vehicle's charging interface. The output terminal of Charger 2 is connected in parallel to the output of the control battery.

[0082] The controller is connected in parallel to the output terminal of the control battery to obtain power. The controller connects to the normally open contacts of key switches S1 (function module 1) and S2 (function module 2), specifically connecting the normally open contacts of the key switches to the input terminal of the controller. The other ends of the normally open contacts of key switches S1 and S2 are connected to the positive terminal of the control battery output. The controller is connected to the coils of relays K1, K2, K3, K4, K6, K8, and K9, and the other ends of the coils of relays K1, K2, K3, K4, K6, K8, and K9 are connected to the negative terminal of the control battery output.

[0083] Functional module 1 is connected in parallel to the output terminal of the control battery. The positive terminal of the input terminal of functional module 1 is connected to the normally open contact of relay K3, and the other end of the normally open contact of relay K3 is connected to the positive terminal of the control battery.

[0084] Functional module 2 is connected in parallel to the output terminal of the control battery. The positive input terminal of functional module 2 is connected to the normally open contact of relay K4, and the other end of the normally open contact of relay K4 is connected to the positive terminal of the control battery. The negative input terminal of functional module 2 is connected to the normally closed contact of relay K5, and the normally closed contact of relay K5 is connected to the negative output terminal of the control battery. The coil of relay K5 is connected in series with a reset switch, with one end of reset switch SB2 connected to the positive output terminal of the control battery, and the other end of the coil of relay K5 connected to the negative terminal of the control battery.

[0085] Functional module 3 is connected in parallel to the output terminal of the control battery. The positive terminal of the input terminal of functional module 3 is connected to the normally open contact of relay K6, and the other end of the normally open contact of relay K6 is connected to the positive terminal of the control battery.

[0086] One end of the low battery / charging indicator HL1 (red) is connected to the negative terminal of the control battery output, and the other end is connected to the normally open contact of relay K8. The other end of the normally open contact of relay K8 is connected to the positive terminal of the control battery output.

[0087] One end of the charging completion indicator HL2 (red) is connected to the negative terminal of the control battery output, and the other end is connected to the normally open contact of relay K8. The other end of the normally open contact of relay K8 is connected to the positive terminal of the control battery output.

[0088] One end of the normally open contact of the SB1 start switch is connected to the positive terminal of the control battery output, and the other end is connected to the coil of relay K7. The other end of the coil of relay K7 is connected to the negative terminal of the control battery output.

[0089] The negative terminal of the control battery output is connected in series with a negative switch, and the other end of the negative switch is connected to a circuit breaker QF. The positive terminal of the control battery is directly connected to the circuit breaker QF. The circuit breaker QF is connected in series at the control battery output for overload and short-circuit protection.

[0090] The negative terminal of the control battery output is connected to the normally open contact of relay K11 via circuit breaker QF. The normally open contact of relay K7 is connected in parallel with the normally open contact of relay K11.

[0091] The BMS of the power battery and control battery has its own communication system, which is connected to the controller via CAN bus to achieve real-time communication.

[0092] Specifically, the control method for the dual-battery charging and power supply circuit of the work vehicle is as follows:

[0093] When the vehicle is not in use for an extended period, turn off the negative terminal switch to prevent the control battery from running out of power.

[0094] The vehicle activation process is as follows:

[0095] Open the circuit breaker QF and the negative switch in the control battery circuit. Press the SB1 start switch. SB1 is a self-locking push-button switch. The relay K7 coil is energized, causing K7 to engage, thus connecting the negative terminal of the control battery and supplying power to the controller, which then starts. Simultaneously, because the SB1 start switch is pressed, the power battery starts outputting power.

[0096] The controller detects the input status. If there is AC220V input at the vehicle's charging port, the coil of relay K12 will be energized, and the normally open contact of relay K12 will close. After the normally open contact closes, the controller input receives a high level, and the corresponding input signal is set to 1. At this time, the charging state is in progress. The control program in the controller will shut off the power supply to the functional modules, and functional modules 1-3 will be de-energized, which can reduce unnecessary power consumption and improve the charging speed.

[0097] The controller detects the input status. If there is no AC220V input at the vehicle charging port, the coil of relay K12 is not energized, the normally open contact of relay K12 is not closed, the controller input is floating, and the corresponding input signal is set to 0. At this time, the controller will energize the coil of relay K4, closing the normally open contact of K4, thus energizing functional module 2. Simultaneously, the controller controls the opening and closing of the corresponding relays K3 and K4 based on the status of the key switches for functional module 1 and functional module 2 to determine whether functional modules 1 and 2 receive power.

[0098] The controller obtains the power and control battery levels via the CAN bus. Both batteries report SOC information to the controller. When the power or control battery level is below 20%, the controller outputs a high level at the output terminal of the K8 coil, the K8 coil conducts, the normally open contact of K8 closes, and the low power / charging indicator HL1 (red) lights up, reminding the operator to charge.

[0099] The vehicle body charging interface has an AC220V input, which energizes the coil of relay K12. The normally open contact of relay K12 closes, and the controller input receives a high level, setting the corresponding input signal to 1. At this point, the vehicle is in charging mode. The controller program will then shut off the power supply to the control load, de-energizing functional modules 1-3. The controller program then assumes the vehicle body is in charging mode.

[0100] Currently charging:

[0101] The controller obtains the power battery and control battery power through the CAN bus. When the power of any battery reaches 100%, the controller will control its corresponding AC relay to disconnect. The power battery corresponds to AC relay K1, and the control battery corresponds to AC relay K2.

[0102] When the controller detects that both the power battery and the control battery are at 100% charge, it de-energizes the coils of control relays K1 and K2, energizes the chargers for both the power battery and the control battery, and stops charging to prevent overcharging. Simultaneously, it energizes the coil of control relay K9, closing its normally open contact and illuminating the charging completion indicator HL2 (green), indicating to the operator that charging is complete.

[0103] This vehicle relates to the field of power supply technology for electric work vehicles. It has the functions of automatically switching battery charging circuits, outputting battery power status, and controlling module power supply. It can effectively simplify charging operations, avoid overcharging and over-discharging of the battery, improve battery life, make the battery status of the vehicle body clearer and more concise, and improve the module power supply control function. It can significantly reduce maintenance costs and maintenance personnel training costs, and has strong practical value.

[0104] An embodiment of a dual-battery charging system:

[0105] A dual-battery charging system, different from a vehicle dual-battery charging and supply system, specifically includes a controller, a power battery charging circuit for charging the power battery, and a control battery charging circuit for charging the control battery. The connections between the components in this system have been described in detail in an embodiment of a vehicle and will not be repeated here.

[0106] An implementation method for a dual-battery charging power supply system for vehicles:

[0107] A dual-battery charging and power supply system for vehicles has been described in detail in an embodiment of a vehicle, and will not be repeated here.

Claims

1. A charging system for dual batteries, characterized in that, The system includes a controller, a power battery charging circuit for charging the power battery, and a control battery charging circuit for charging the control battery. The controller is powered and connected to the first relay coil and the second relay coil. The normally open contact of the first relay is connected in series in the power battery charging circuit, and the normally open contact of the second relay is connected in series in the control battery charging circuit. The controller is used to control the gain and loss of power of the first relay coil and the second relay coil, so as to control the power battery and the charging circuit of the battery that needs to be charged to be in a conducting state, and the charging circuit of the battery that does not need to be charged to be in a disconnected state.

2. The dual-battery charging system according to claim 1, characterized in that, The controller is used to communicate with the battery management system of the power battery to obtain the power battery's state of charge. In the power battery charging circuit, the two ends of the first charging interface for connecting to an external charging power source are also connected to a first detection relay coil for detecting the input state of the first charging interface. When the charging power source is connected at the first charging interface, the first detection relay coil is energized. The normally open contact of the first detection relay is connected to the signal input terminal of the controller. When the normally open contact of the first detection relay is closed, the signal input terminal of the controller receives a high level, indicating that the input state of the first charging interface is energized. When the normally open contact of the first detection relay is open, the signal input terminal of the controller receives a low level, indicating that the input state of the first charging interface is de-energized. The controller is used to energize the first relay coil when it detects that the input state of the first charging interface is energized and the power battery is depleted.

3. The dual-battery charging system according to claim 2, characterized in that, The controller is used to communicate with the battery management system that controls the battery in order to obtain the battery's state of charge. The two ends of the second charging interface in the battery charging circuit, which is used to connect to an external charging power supply, are also connected to a second detection relay coil for detecting the input state of the second charging interface. When the charging power is turned on at the second charging interface, the second detection relay coil is energized. The normally open contact of the second detection relay is connected to the signal input terminal of the controller. When the normally open contact of the second detection relay is closed, the signal input terminal of the controller receives a high level, indicating that the input state of the second charging interface is energized. When the normally open contact of the second detection relay is open, the signal input terminal of the controller receives a low level, indicating that the input state of the second charging interface is de-energized. The controller is used to energize the second relay coil when it detects that the input state of the second charging interface is energized and the charge state of the control battery is depleted.

4. The dual-battery charging system according to claim 3, characterized in that, The controller is used to connect to the control battery so that the controller is powered by the control battery to form a controller charging circuit; The control battery charging circuit has a normally open contact of a third relay connected in series, and the coil of the third relay is connected to both ends of the second charging interface. The controller charging circuit has a normally open contact of a fourth relay connected in series. The two ends of the control battery are connected to a starting branch for starting the control battery power supply. The starting branch has a fourth relay coil connected in series and a starting switch for simultaneously starting the power battery and the control battery power supply. By closing the starting switch, the controller charging circuit is turned on, and then the controller is powered by the control battery to start the controller. The normally open contact of the third relay in the control battery charging circuit is connected in parallel with the normally open contact of the fourth relay in the controller charging circuit. This allows the normally open contact of the third relay to bypass the normally open contact of the fourth relay when it is in the open state, and the normally open contact of the fourth relay to bypass the normally open contact of the third relay when it is in the open state. This enables the switching of power supply from the external charging power source to the control battery and the control load, including the controller, and the switching of power supply from the control battery to the control load, including the controller.

5. The dual-battery charging system according to claim 3 or 4, characterized in that, The first charging interface and the second charging interface are the same. Correspondingly, the first detection relay coil and the second detection relay coil are the same, and the normally open contact of the first detection relay and the normally open contact of the second detection relay are also the same.

6. The dual-battery charging system according to claim 1, characterized in that, When both the first charging interface in the power battery charging circuit and the second charging interface in the control battery charging circuit receive AC power, a charger adapted to the battery for converting AC to DC is connected in series in both the power battery charging circuit and the control battery charging circuit.

7. The dual-battery charging system according to claim 3, characterized in that, The controller has a CAN interface, which enables communication between the battery management systems of the power battery and the control battery and the controller via the CAN bus.

8. A dual-battery charging and power supply system for vehicles, comprising a power battery for supplying power to a power load, a control battery for supplying power to a control load including a controller, and a dual-battery charging system, characterized in that, The dual-battery charging system adopts the dual-battery charging system as described in any one of claims 1 to 7.

9. The dual-battery charging and power supply system for vehicles according to claim 8, characterized in that, The control battery power supply is connected to the controller to form a controller charging circuit. The controller charging circuit is also equipped with a first air switch and / or a negative switch to prevent the control battery from running out of power. The control battery charging circuit is also equipped with a second air switch.

10. A vehicle comprising a power load, a control load excluding a controller, and a dual-battery charging and power supply system for the vehicle, characterized in that, The dual-battery charging and power supply system for vehicles adopts the dual-battery charging and power supply system for vehicles as described in claim 8 or 9, wherein the control load other than the controller is connected in parallel with the controller, thereby realizing the connection of the control battery power supply to the control load other than the controller.

11. The vehicle according to claim 10, characterized in that, The dual-battery charging and power supply system for the vehicle also includes a fifth relay. The control load, in addition to the controller, is connected in parallel with the controller after the normally open contact of the fifth relay is connected in series. The controller's power supply is connected to the coil of the fifth relay.

12. The vehicle according to claim 11, characterized in that, The controller is also used to receive the key switch signal corresponding to the control load, and control the fifth relay coil to be energized according to the state of the key switch signal, so as to realize the start and stop of the control load.

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