Double-power-battery power supply system and method for logistics vehicle

Abstract

The invention discloses a dual-power-battery power supply system and method for a logistics vehicle, and belongs to the technical field of new energy automobiles. The battery replacement module is used for charging the first power battery pack when the residual electric quantity is not smaller than 10%, cutting off the connection with the first power battery when the residual electric quantity is smaller than 10% of the rated capacity, and charging voltage U = U1 + (4-6) V when the first power battery pack is charged, and U1 is the real-time voltage value of the first power battery pack. During use, the battery replacement module supplies power to the first power battery pack through the method, charging is achieved while driving is conducted, battery replacement is conducted on the battery replacement module when the electric quantity of the battery replacement module is smaller than 10% of the rated capacity, due to the fact that the battery replacement module is small in size, the construction cost and the occupied area of the battery replacement station are lower, high-density arrangement of the battery replacement station can be facilitated, and the service life of the battery replacement station is prolonged. And timely replacement of the battery replacement module of the vehicle is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile power supply technology, in particular to a logistics vehicle dual-power battery power supply system and method. BACKGROUND

[0002] At present, the battery replacement mode of new energy logistics vehicles is one vehicle one battery. When replacing the battery, the entire battery pack needs to be replaced. The battery replacement cost is high, the battery replacement time is long, the charging time of the battery pack after replacement is long, the utilization rate is low, the land occupation area of the battery replacement station is large, the land utilization rate is low, the investment is large, which leads to insufficient construction density of the battery replacement station and affects the long-distance endurance of cold chain logistics. SUMMARY

[0003] The purpose of the present application is to solve the above problems and provide a logistics vehicle dual-power battery power supply system and method.

[0004] To achieve the above purpose, the technical scheme of the present application is as follows: a logistics vehicle dual-power battery power supply system, comprising: a first power battery pack; a battery replacement module, configured to charge the first power battery pack when the remaining power is not less than 10%, and to disconnect the first power battery when the remaining power is less than 10% of the rated capacity, and to charge the first power battery pack at a charging voltage U=U1+(4-6)V, wherein U1 is the real-time voltage value of the first power battery pack.

[0005] Further, the battery replacement module comprises a battery replacement battery module, and the capacity of the battery replacement battery module is 20kW·h-40kW·h.

[0006] Further, the battery replacement module comprises a DCDC bidirectional charge and discharge module, and the DCDC bidirectional charge and discharge module is configured to obtain the bus voltage of the first power battery pack in real time.

[0007] Further, the battery replacement module comprises a BMS management system, configured to collect the working parameters of the battery replacement battery module; and the BMS management system is connected with the DCDC bidirectional charge and discharge module.

[0008] Further, the present application also provides a logistics vehicle dual-battery power supply method, comprising the following steps: Step one, detecting the bus voltage U1 of the first power battery pack, connecting the first power battery and the battery replacement module after a predetermined time t on the first power battery, and supplying power to the first power battery by the battery replacement module voltage U, U=U1+(4-6)V; Step two, disconnecting the first power battery from the battery replacement module when the remaining power of the battery replacement module is less than 10% of the rated capacity.

[0009] Further, the predetermined time t is in the range of 15 seconds to 30 seconds.

[0010] The logistics vehicle double-power battery power supply system and method has the following beneficial effects compared with the prior art: through the double-power design, the battery replacement module has a small volume, so that the construction cost and land occupation of the battery replacement station are lower, and the high-density arrangement of the battery replacement station is facilitated, and the vehicle can be timely replaced with the battery replacement module. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is an electrical schematic diagram of the logistics vehicle double-power battery power supply system.

[0012] Figure 2 It is a partial enlarged schematic diagram of the electrical schematic diagram of the logistics vehicle double-power battery power supply system.

[0013] Figure 3 It is a circuit diagram of the bidirectional control circuit in the logistics vehicle double-power battery power supply system.

[0014] Figure 4 It is a flowchart of the logistics vehicle double-power battery power supply method. DETAILED DESCRIPTION

[0015] The present application will now be further described in detail with reference to the accompanying drawings. The accompanying drawings are simplified schematic diagrams and only schematically illustrate the basic structure of the present application, and thus only show the components related to the present application.

[0016] Example 1 The present application provides a logistics vehicle double-power battery power supply system. As a specific embodiment, reference is made to Figure 1 、 Figure 2 The system comprises: a first power battery pack; a battery replacement module, configured to charge the first power battery pack when the remaining power is not less than 10%, and to disconnect the first power battery when the remaining power is less than 10% of the rated capacity, and to charge the first power battery pack at a charging voltage U=U1+(4-6) V, wherein U1 is the real-time voltage value of the first power battery pack.

[0017] Specifically, the technical solution of the present application comprises a first power battery pack, which is the A battery shown in Figure 1 , and is the original vehicle power battery pack, fixedly installed on the vehicle; and further comprises a battery replacement module, which is Figure 1 、 Figure 2The battery swapping module includes a B battery and a BMS management system, a DC-DC bidirectional charge and discharge control module, and a dual-battery control circuit connected to the B battery. The B battery is the battery swapping module. In practical applications, the battery is integrated into the battery box to form a detachable and easy-to-replace battery pack. The BMS management system, DC-DC bidirectional charge and discharge control module, and dual-battery control circuit are all integrated into the battery pack.

[0018] In this application, battery B is connected to the BMS management system. The BMS management system is responsible for controlling the box to obtain the rated voltage, differential voltage, and temperature parameters of each individual battery in the battery pack. Specifically, it includes a voltage acquisition module, a temperature acquisition module, and a current acquisition module to obtain the operating parameters of battery B. Based on the voltage parameters, it obtains the charge status of battery B. It should be noted that the voltage acquisition module, temperature acquisition module, and current acquisition module all adopt existing technologies.

[0019] In this application, the DC-DC bidirectional charge and discharge control module is connected to the output terminal of battery B. During operation, it also acquires the bus voltage information of battery A and adjusts the output voltage according to the bus voltage of battery A. The output voltage of battery B is the charging voltage U of battery A. It ensures that the charging voltage U and the real-time voltage U1 of battery A satisfy the following relationship: U = U1 + (4~6)V. Specifically, the values ​​of the charging voltage U are: U = U1 + 4V, U = U1 + 5V, U = U1 + 6V. Specifically, the DC-DC bidirectional charge and discharge control module acquires the bus voltage of battery A and controls the output voltage, thereby controlling the charging voltage so that battery B charges battery A with a maximum current of 20A.

[0020] Further, refer to Figure 3This is a circuit diagram of the bidirectional control circuit in this application, which includes a first contactor K2, a second contactor K1, a third contactor K17, a first current rectifier diode D3, and a second current rectifier diode D4. The control pin of the first contactor K2 is electrically connected to the control terminal. The first contactor K2 also includes a first conductive pin and a second conductive pin, with the first conductive pin electrically connected to the positive terminal (B+) of the battery. The contactor operates by using current flowing through the coil to generate a magnetic field, causing the contacts to close, thereby controlling the load. In this application, the control terminal provides control current to the first contactor K2. When the control terminal provides control current to the first contactor K2, the first and second conductive pins conduct, enabling the main circuit to be connected. The first conductive pin is electrically connected to the positive terminal of the battery. Similarly, the control pin of the second contactor K1 is electrically connected to the control terminal. The second contactor K1 also includes a third conductive pin and a fourth conductive pin. The third conductive pin is electrically connected to the second conductive pin, and the fourth conductive pin is electrically connected to the positive terminal of the battery. The control pin of the third contactor K17 is electrically connected to the control terminal. The third contactor K17 also includes a fifth pin and a sixth pin. The fifth pin is electrically connected to the second and third conductive pins, respectively, and the sixth pin is connected to the charging positive terminal. It should be noted that the control terminal selectively provides current to the control pins of the first contactor K2, the second contactor K1, and the third contactor K17 to achieve separate control of each contactor. The input terminal of the first current rectifier diode D3 is connected to the positive terminal of battery A, and the output terminal of the first current rectifier diode D3 is electrically connected to the second conductive pin. The input terminal of the second current rectifier diode D4 is connected to the charging positive terminal, and the output terminal of the second current rectifier diode D4 is electrically connected to the second, third, and fifth conductive pins, respectively. The battery positive terminal B+ is connected to the positive terminal of the DC-DC bidirectional charging and discharging module in the battery swapping module. The charging positive terminal P+ is connected to a terminal block for insertion into the positive terminal of battery A, thus facilitating the detachment of the battery swapping module.

[0021] When the battery swapping module is installed in the vehicle, the charging positive terminal P+ can be connected to the wiring port for mating with the positive terminal of battery A. When the battery swapping module is installed in the vehicle, the charging positive terminal P+ is connected to the positive terminal of battery A. The charging process of battery A by the battery swapping module includes: First, the pre-charging circuit is activated via the control terminal, providing voltage to the third contactor K17. Typically, 12V is used. Pins 1 and 2 of K17 (i.e., the control pins) are energized to achieve engagement. At this time, the first contactor K2 and the second contactor K1 are not engaged, so current flows from the battery's positive terminal B+, through the first current rectifier diode D3, to pin 4 of the third contactor K17. Since the third contactor K17 is now engaged, current is then directed from pin 3 to battery A, which is connected to the charging positive terminal P+, thus achieving pre-charging. After pre-charging, the first contactor K2 is in the open state, so current flows from the battery's positive terminal B+, through the first current rectifier diode D3, to pin 3 of the second contactor K1. The control terminal provides voltage to the second contactor K1, energizing pins 1 and 2 to achieve engagement. Pins 3 and 4 of the second contactor K1 are now conducting, and current flows to the charging positive terminal P+, discharging battery B and charging battery A.

[0022] When the battery swapping module is separated from the vehicle for charging, the positive terminal of the external charging circuit is connected to the charging positive terminal P+. First, the pre-charging circuit is activated by the control terminal to provide voltage to the third contactor K17. Typically, a 12V voltage can be used. Pins 1 and 2 of K17 (i.e., the control pins) are energized to achieve engagement. At this time, the first contactor K2 and the second contactor K1 are not engaged, so the current is triggered from the battery positive terminal B+, passes through the first current rectifier diode D3, and reaches pin 4 of the third contactor K17. At this time, the third contactor K17 is engaged, so the current is then led out from pin 3 to the charging positive terminal to charge battery B in the battery swapping module.

[0023] Specifically, this application provides a dual-battery power supply system for logistics vehicles. This system utilizes a swappable battery module and a battery A fixed to the vehicle. By using two sets of batteries, the original high-capacity battery is replaced with two smaller battery sets. During operation, battery B charges battery A, allowing the vehicle to charge battery A while driving. When the charge of battery B drops below 10% of its rated capacity, the BMS management system automatically disconnects the bus circuit, and the vehicle is then powered by battery A. The vehicle can then proceed to a nearby battery swapping station to replace the entire battery module. Due to the small size of the battery module, the construction cost and floor space of the battery swapping station are reduced, facilitating high-density deployment and timely replacement of battery modules. Furthermore, the miniaturization of the battery module allows for rapid charging at charging stations. Statistics show that a battery capacity of 20 kWh to 40 kWh also facilitates rapid recharging within charging stations, promoting the circulation and use of the battery module and further reducing the construction cost of battery swapping stations.

[0024] Furthermore, as a specific implementation, the battery swapping module includes a battery swapping unit with a capacity of 20 kWh - 40 kWh. Specifically, designing the capacity of battery B in the battery swapping unit to be 20 kWh - 40 kWh ensures the miniaturization of the battery swapping module.

[0025] Referring to the table below, the dual-power supply system provided in this application, compared with the traditional whole-pack battery swapping technology, can significantly reduce the investment cost of battery swapping stations; moreover, the battery swapping time is short and the battery capacity of the battery swapping module is small, which is conducive to rapid replenishment of power. Therefore, it can effectively improve the battery utilization rate and thus effectively reduce the scale of battery swapping stations, which is conducive to the implementation of micro-small battery swapping stations and has a high land utilization rate.

[0026] Furthermore, the battery swapping module includes a DC-DC bidirectional charge / discharge module, which is used to acquire the bus voltage of the first power battery pack in real time. Specifically, in practical applications, the DC-DC bidirectional charge / discharge module of the battery swapping module is electrically connected to battery A. Through the DC-DC bidirectional charge / discharge module, the bus voltage of battery A can be acquired in real time, thereby enabling real-time regulation of the output voltage to ensure that the charging voltage U and the bus voltage of battery A have a predetermined difference.

[0027] Furthermore, the battery swapping module includes a BMS management system for collecting the operating parameters of the battery swapping module; the BMS management system is connected to the DC-DC bidirectional charging and discharging module. Specifically, the parameters of the B battery within the battery swapping module are controlled and managed by setting up the BMS management system.

[0028] Example 2 This application also provides a method for supplying power to a logistics vehicle using dual power batteries, see reference. Figure Four The method includes the following steps: Step 1: Detect the bus voltage U1 of the first power battery pack. After a predetermined time t after the first power battery pack is powered on, connect the first power battery and the battery swapping module. The voltage U of the battery swapping module supplies power to the first power battery, U = U1 + (4~6)V. Step 2: When the remaining power of the battery swapping module is less than 10% of its rated capacity, the battery swapping module is disconnected from the first power battery.

[0029] Specifically, the method provided in this embodiment is based on the dual-battery power supply system for logistics vehicles in Embodiment 1. In actual operation, after the vehicle is powered on, after a predetermined delay t, the dual-battery control circuit connects battery A and the DC-DC bidirectional charging / discharging module. The DC-DC bidirectional charging / discharging module automatically detects the bus voltage of the original vehicle's battery A and simultaneously reads data from the battery swapping module's BMS management system to obtain the voltage of battery B. It then actively adjusts the voltage to be 5V higher than the original battery, charging the original vehicle's power battery with a maximum current of 20A. When the SOC of battery B drops to 10%, the BMS management system automatically disconnects the bus circuit for separate charging (or battery swapping). The logistics vehicle only needs to enter a battery swapping station to replace the BMS management system, main control module, and battery B pack to continuously replenish the original vehicle's power pack.

[0030] Furthermore, as a specific implementation method, the predetermined duration t ranges from 15 seconds to 30 seconds. For details, please refer to... Figure 2 A delay switch 8 is connected to the positive terminal of battery B, and the specific value of the predetermined time t can be set through the delay switch.

[0031] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A dual-power battery power supply system for a logistics vehicle, characterized in that, include: First power battery pack; The battery swapping module is used to charge the first power battery pack when the remaining power is not less than 10%, and to disconnect from the first power battery when the remaining power is less than 10% of the rated capacity. When charging the first power battery pack, the charging voltage is U = U1 + (4~6)V, where U1 is the real-time voltage value of the first power battery pack.

2. The dual-power battery power supply system for a logistics vehicle according to claim 1, characterized in that, The battery swapping module includes a battery swapping module with a capacity of 20 kWh to 40 kWh.

3. The dual-power battery power supply system for a logistics vehicle according to claim 2, characterized in that, The battery swapping module includes a DC-DC bidirectional charge and discharge module, which is used to obtain the bus voltage of the first power battery pack in real time.

4. The dual-power battery power supply system for a logistics vehicle according to claim 3, characterized in that, The battery swapping module includes a BMS management system for collecting the operating parameters of the battery swapping module. The BMS management system is connected to the DC-DC bidirectional charging and discharging module.

5. A method for supplying power to a logistics vehicle using dual power batteries, characterized in that, Includes the following steps: Step 1: Detect the bus voltage U1 of the first power battery pack. After a predetermined time t after the first power battery pack is powered on, connect the first power battery and the battery swapping module. The voltage U of the battery swapping module supplies power to the first power battery, U = U1 + (4~6)V. Step 2: When the remaining power of the battery swapping module is less than 10% of its rated capacity, the battery swapping module is disconnected from the first power battery.

6. A method for supplying power to a logistics vehicle using dual power batteries according to claim 5, characterized in that, The predetermined duration t ranges from 15 seconds to 30 seconds.

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