Lithium battery device, automatic guided transport vehicle and battery replacement system

Abstract

The invention discloses a lithium battery device, an automatic guide transport vehicle and a battery replacement system, and relates to the technical field of batteries. The automated guided vehicle is provided with a battery containing bin, a first power supply connecting end is arranged on a first face of the battery containing bin, and an opening is formed in the opposite face of the first face. The first surface is parallel to the bottom surface of the automatic guide transport vehicle; the lithium battery device comprises a lithium battery pack; the first surface of the battery box is provided with a second power supply connecting end, and the second surface of the battery box is provided with a connecting assembly; the second power supply connecting end is electrically connected with the lithium battery pack so as to charge and discharge the lithium battery pack; wherein the first surface of the battery box and the second surface of the battery box are opposite surfaces; and when the first power supply connecting end is correspondingly connected with the second power supply connecting end, the second surface of the battery box corresponds to the opening of the battery accommodating bin, so that the connecting assembly on the second surface of the battery box is exposed at the opening of the battery box. The invention aims to improve the power supply convenience of the automated guided vehicle.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a lithium battery device, an automatic guided transport vehicle and a battery replacement system. Background Art

[0002] AGV (Automated Guided Vehicle) is a driverless vehicle widely used in industrial production, warehousing and logistics. It can drive autonomously without a driver according to a predetermined path or instruction to complete tasks such as cargo handling and material distribution to reduce labor costs. Among them, AGV is usually powered by lithium battery devices, and the energy of AGV can be replenished by replacing or charging the battery.

[0003] However, due to structural design problems, the lithium battery devices in existing AGVs are difficult to replace and need to be replaced manually, resulting in an imperfect overall automation level of the system. Summary of the invention

[0004] The main purpose of the present invention is to provide a lithium battery device, an automatic guided transport vehicle and a battery replacement system, aiming to improve the convenience of power supply for the automatic guided transport vehicle.

[0005] To achieve the above object, the present invention proposes a lithium battery device, which is applied to an automatic guided transport vehicle, characterized in that the automatic guided transport vehicle has a battery storage compartment, a first surface of the battery storage compartment is provided with a first power connection terminal, and an opposite surface of the first surface is an opening; the first surface is parallel to the bottom surface of the automatic guided transport vehicle; the lithium battery device comprises:

[0006] Lithium battery pack;

[0007] A battery box, wherein a first surface of the battery box is provided with a second power connection terminal, and a second surface of the battery box is provided with a connection component; the second power connection terminal is electrically connected to the lithium battery pack to realize charging and discharging of the lithium battery pack;

[0008] Among them, the first side of the battery box and the second side of the battery box are opposite sides; when the first power connection terminal is correspondingly connected to the second power connection terminal, the second side of the battery box corresponds to the opening of the battery accommodating compartment, so that the connecting component of the second side of the battery box is exposed at the opening of the battery box.

[0009] In one embodiment, the lithium battery device further includes a battery management device, and the battery management device includes:

[0010] Main control circuit;

[0011] A temperature detection circuit, wherein an output end of the temperature detection circuit is electrically connected to the main control circuit, and the temperature detection circuit is used to output a temperature detection signal;

[0012] A heating component, the heating component is arranged in the lithium battery pack, and the heating component is electrically connected to the main control circuit;

[0013] Wherein, the main control circuit is used to output a heating control signal according to the temperature detection signal to control the operation of the heating component.

[0014] In one embodiment, the lithium battery device also includes a voltage conversion circuit, a first end of the voltage conversion circuit is electrically connected to the lithium battery pack, a second end of the voltage conversion circuit is electrically connected to the second power connection end, and the voltage conversion circuit is used to convert the input first voltage into a second voltage and output it.

[0015] In one embodiment, the second power connection terminal of the battery box includes:

[0016] A first voltage connection terminal, the first voltage connection terminal is electrically connected to the lithium battery pack, and the first voltage connection terminal is used to output a first voltage;

[0017] A second voltage connection terminal, the second voltage connection terminal is electrically connected to the output terminal of the voltage conversion circuit, and the second voltage connection terminal is used to output a second voltage.

[0018] In one embodiment, the main control circuit is specifically configured as follows:

[0019] When the lithium battery device is in a discharging state, controlling the first voltage connection terminal to output a first voltage, and after a preset time, controlling the second voltage connection terminal to output a second voltage;

[0020] When the lithium battery device is in a stop-discharging state, the second voltage connection terminal is controlled to stop outputting the second voltage, and after a preset time, the first voltage connection terminal is controlled to stop outputting the first voltage.

[0021] In one embodiment, the lithium battery device further includes a heat dissipation component, which is disposed on one side of the battery box, is electrically connected to the main control circuit, and is used to dissipate heat from the voltage conversion circuit.

[0022] In one embodiment, a third power connection terminal is further provided on the second surface of the battery box, and the third power connection terminal is electrically connected to the lithium battery pack.

[0023] In one embodiment, the lithium battery device further comprises:

[0024] a power detection circuit, wherein the input end of the power detection circuit is electrically connected to the second power connection end and the third power connection end respectively, and the output end of the power detection circuit is electrically connected to the main control circuit, and the power detection circuit is used to detect the connection status of the second power connection end and the third power connection end, and output a connection detection signal;

[0025] A power connection switching circuit, wherein a first end of the power connection switching circuit is electrically connected to the lithium battery pack, a second end of the power connection switching circuit is electrically connected to the second power connection end, a third end of the power connection switching circuit is electrically connected to the third power connection end, and a controlled end of the power connection switching circuit is electrically connected to the main control circuit;

[0026] In which, the main control circuit is also used to control the power connection switching circuit to connect the path between the second power connection terminal and the lithium battery pack and disconnect the path between the third power connection terminal and the lithium battery pack according to the connection detection signal; or, the main control circuit is also used to control the power connection switching circuit to connect the path between the third power connection terminal and the lithium battery pack and disconnect the path between the second power connection terminal and the lithium battery pack according to the connection detection signal.

[0027] The present invention also provides an automatic guided transport vehicle, the automatic guided transport vehicle comprising a lithium battery device as described in any one of the above items;

[0028] The automatic guided transport vehicle has a battery storage compartment, a first surface of the battery storage compartment is provided with a first power connection terminal, an opposite surface of the first surface is an opening, and the first surface is parallel to the bottom surface of the automatic guided transport vehicle.

[0029] The present invention also provides a battery replacement system, characterized in that the battery replacement system includes the automatic guided transport vehicle and the battery replacement device as described above;

[0030] Wherein, the battery replacement device has a traction replacement device corresponding to the connection component on the second side of the battery box.

[0031] The technical solution of the present invention is to set a battery storage compartment in the automatic guided transport vehicle, and set a first power connection terminal on the first surface of the battery storage compartment for connecting to the power supply. Among them, the opposite side of the first surface of the battery storage compartment is an opening, and the size of the opening corresponds to the size of the lithium battery device. In addition, the first surface of the battery storage compartment is parallel to the bottom surface of the automatic guided transport vehicle, so that the lithium battery device can place or remove the battery in a direction perpendicular to the bottom surface of the automatic guided transport vehicle. Further, the lithium battery device includes a lithium battery pack and a battery box. Among them, the lithium battery pack is arranged inside the battery box. The first surface of the battery box is provided with a second power connection terminal, and the second power connection terminal is electrically connected to the lithium battery pack, so as to realize the charging and discharging of the lithium battery. The second surface of the battery box is provided with a connecting component, and the second surface of the battery box corresponds to the opening of the battery storage cavity, so that the connecting component of the second surface of the battery box is exposed at the opening of the battery box, which is convenient for the rapid placement and removal of the lithium battery device, and effectively improves the convenience of power supply for the automatic guided transport vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0033] Figure 1 It is a schematic structural diagram of the lithium battery device of the present invention;

[0034] Figure 2 A schematic diagram of a module of a lithium battery device according to an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of a module of another embodiment of a lithium battery device of the present invention;

[0036] Figure 4 It is a structural schematic diagram of an embodiment of a lithium battery device of the present invention;

[0037] Figure 5 FIG. 4 is a schematic diagram of a module of a lithium battery device according to another embodiment of the present invention.

[0038] Description of Figure Numbers:

[0039] A. Second power connection terminal; B. Connection component; C. Third power connection terminal; D. Heat dissipation component; 10. Lithium battery pack; 20. Main control circuit; 30. Temperature detection circuit; 40. Heating component; 50. Voltage conversion circuit; 60. Power detection circuit; 70. Power connection switching circuit.

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] AGV (Automated Guided Vehicle) is a driverless vehicle widely used in industrial production, warehousing and logistics. It can drive autonomously without a driver according to a predetermined path or instruction to complete tasks such as cargo handling and material distribution to reduce labor costs. Among them, AGV is usually powered by lithium battery devices, and the energy of AGV can be replenished by replacing or charging the battery.

[0045] However, due to structural design problems, the lithium battery devices in existing AGVs are difficult to replace and need to be replaced manually, resulting in an imperfect overall automation level of the system.

[0046] To solve the above problems, refer to Figure 1The present invention provides a lithium battery device, which is applied to an automatic guided transport vehicle, wherein the automatic guided transport vehicle has a battery storage compartment, a first surface of the battery storage compartment is provided with a first power connection terminal, and an opposite surface of the first surface is an opening; the first surface is parallel to the bottom surface of the automatic guided transport vehicle; the lithium battery device comprises:

[0047] Lithium battery pack 10;

[0048] A battery box, wherein a second power connection terminal A is disposed on a first surface of the battery box, and a connection component B is disposed on a second surface of the battery box; the second power connection terminal A is electrically connected to the lithium battery pack 10 to realize charging and discharging of the lithium battery pack 10;

[0049] Among them, the first side of the battery box and the second side of the battery box are opposite sides; when the first power connection terminal is correspondingly connected to the second power connection terminal A, the second side of the battery box corresponds to the opening of the battery accommodating compartment, so that the connecting component B on the second side of the battery box is exposed at the opening of the battery box.

[0050] Understandably, some AGVs need to quickly replace batteries in order to reduce downtime and improve work efficiency during long-term operations. For example, in some 24 / 7 operating environments, in order to keep the AGV running continuously, a quickly replaceable battery system is required. When the AGV battery is low, the AGV will automatically go to the designated location to replace the fully charged battery without waiting for the battery to be slowly charged to full power, thereby quickly and effectively improving work efficiency.

[0051] In this embodiment, the lithium battery pack 10 can be implemented by using multiple lithium iron phosphate cells. Among them, lithium iron phosphate batteries are known for their high safety, long cycle life and good thermal stability, which makes them very suitable for building battery packs, especially in applications requiring stability and reliability, such as electric vehicles, energy storage systems, etc. In addition, the lithium battery pack 10 can also be implemented by using lithium cobalt oxide cells. Further, to ensure that the AGV has sufficient power and efficiency, the cells in the lithium battery pack 10 are connected in series to increase the output voltage. Optionally, in this embodiment, the lithium battery pack 10 is implemented by using multiple lithium iron phosphate cells as an example. To ensure that the AGV has sufficient power and efficiency, the nominal voltage output by the lithium battery pack 10 needs to be 76.8V. Among them, the nominal voltage of the lithium iron phosphate cell is 3.2V. Therefore, in order to achieve a total voltage of 76.8V, 24 lithium iron phosphate cells need to be connected in series. In addition, by using 24 lithium iron phosphate cells, a large capacity of 404Ah is provided for the lithium battery pack 10, so that the AGV has sufficient endurance.

[0052] It is understandable that the lithium battery device is applied to the automatic guided transport vehicle, and the battery storage compartment of the automatic guided transport vehicle is provided with an opening parallel to the automatic guided transport vehicle, which will make the lithium battery device directly face the external environment. Therefore, the working environment of the lithium battery device may include various challenges in industrial scenarios, such as mechanical shock, vibration, humidity changes, and temperature fluctuations.

[0053] In this embodiment, the battery box can be implemented by metal materials, composite materials, engineering plastics, etc. Among them, the metal material can be implemented by, for example, aluminum alloy, galvanized steel plate, etc.; the composite material can be implemented by glass fiber reinforced plastic, carbon fiber composite material, etc.; the engineering plastic can be implemented by polycarbonate, ABS, etc. Optionally, in this embodiment, the lithium battery device needs to provide a higher voltage and a larger capacity for the automatic guided transport vehicle, so it is necessary to give priority to metal materials, such as aluminum alloy, because they can not only provide the necessary physical protection, but also have good thermal conductivity to help dissipate heat. In addition, in order to improve certain specific performance (such as electromagnetic shielding, corrosion resistance, etc.), sometimes a coating or other type of protective layer is added to the metal shell. Further, the shape of the battery box needs to correspond to the battery storage compartment and the lithium battery pack 10. For example, the battery storage compartment is a rectangular parallelepiped, and the shape and size of the battery box need to correspond to the battery storage compartment designed as a rectangular parallelepiped. Among them, the first side of the battery box is provided with a second power connection terminal A, which is used to be electrically connected to the first power connection terminal when the lithium battery device is placed in the battery storage compartment, so as to realize power supply for the AGV. In addition, the second side of the battery box is provided with a connection component B, and the connection component B can be implemented by a plug-in structure or a lock structure. Further, the connection component B is provided on the second side of the battery box, and the second side of the battery box corresponds to the opening of the battery storage compartment, so that the connection component B can be directly connected to the traction replacement device of the external battery replacement device, thereby improving the replacement efficiency of the lithium battery device.

[0054] The technical solution of the present application is to set a battery storage compartment in the automatic guided transport vehicle, and set a first power connection terminal on the first surface of the battery storage compartment for connecting to the power supply. Among them, the opposite surface of the first surface of the battery storage compartment is an opening, and the size of the opening corresponds to the size of the lithium battery device. In addition, the first surface of the battery storage compartment is parallel to the bottom surface of the automatic guided transport vehicle, so that the lithium battery device can place or remove the battery in a direction perpendicular to the bottom surface of the automatic guided transport vehicle. Further, the lithium battery device includes a lithium battery pack 10 and a battery box. Among them, the lithium battery pack 10 is arranged inside the battery box. The first surface of the battery box is provided with a second power connection terminal A, and the second power connection terminal A is electrically connected to the lithium battery pack 10, so as to realize the charging and discharging of the lithium battery. The second surface of the battery box is provided with a connection component B, and the second surface of the battery box corresponds to the opening of the battery storage cavity, so that the connection component B on the second surface of the battery box is exposed at the opening of the battery box, which is convenient for the rapid placement and removal of the lithium battery device, and effectively improves the convenience of power supply for the automatic guided transport vehicle.

[0055] refer to Figure 1 and Figure 2 In one embodiment of the present invention, the lithium battery device further includes a battery management device, and the battery management device includes:

[0056] Main control circuit 20;

[0057] A temperature detection circuit 30, wherein an output end of the temperature detection circuit 30 is electrically connected to the main control circuit 20, and the temperature detection circuit 30 is used to output a temperature detection signal;

[0058] A heating component 40, wherein the heating component 40 is disposed in the lithium battery pack 10, and the heating component 40 is electrically connected to the main control circuit 20;

[0059] The main control circuit 20 is used to output a heating control signal according to the temperature detection signal to control the operation of the heating component 40 .

[0060] In this embodiment, the main control circuit 20 can be implemented by a main controller, such as SOC (System On Chip), MCU (Microcontroller Unit), DSP (Digital Signal Process), FPGA (Field Programmable Gate Array), etc.

[0061] In this embodiment, the temperature detection circuit 30 can be implemented by a detection circuit based on a thermistor, such as a resistor divider circuit based on an NTC resistor or an NTC probe, or a resistor divider circuit based on a PTC resistor or a PTC probe. Optionally, the temperature detection circuit 30 can also be implemented by a temperature sensor, such as an infrared temperature sensor, a thermocouple temperature sensor, etc. Among them, there can be multiple temperature detection circuits 30, and the multiple temperature detection circuits 30 can be arranged at different positions in the lithium battery pack 10. The main control circuit 20 can determine multiple temperature values ​​according to multiple temperature detection signals, and calculate the actual operating temperature through a preset temperature algorithm, such as an average value, a weighted calculation, etc., so as to improve the accuracy of the detection of the operating temperature of the battery cell.

[0062] In the present embodiment, the heating component 40 can be implemented by a heating resistor, a PTC heater, or a built-in heating sheet. Among them, the heating component 40 is taken as an example of a heating resistor. A heating resistor is arranged inside or around the lithium battery pack 10, and the main control circuit 20 controls whether it is powered on, thereby controlling whether it generates heat. Further, when the main control circuit 20 detects through the temperature detection circuit 30 that the temperature of the lithium battery pack 10 is lower than the preset value, the main control circuit 20 will output a corresponding heating control signal to control the heating resistor to power on, and detect through the temperature detection circuit 30 whether the current temperature of the lithium battery pack 10 reaches a temperature suitable for the operation of the lithium battery pack 10, thereby outputting a corresponding heating control signal to control the heating resistor to power off, thereby avoiding the operating temperature of the lithium battery pack 10 being too high.

[0063] refer to Figure 1 and Figure 3 In one embodiment of the present invention, the lithium battery device further includes a voltage conversion circuit 50, a first end of the voltage conversion circuit 50 is electrically connected to the lithium battery pack 10, a second end of the voltage conversion circuit 50 is electrically connected to the second power connection terminal A, and the voltage conversion circuit 50 is used to convert the input first voltage into a second voltage and output it.

[0064] It is understandable that AGV usually adopts a DC power supply system because the DC motor and the related drive control system have obvious advantages in starting torque, speed range, etc., and are suitable for applications such as AGV that require precise control of speed and position. Therefore, the lithium battery device will output the power supply voltage corresponding to the DC motor and the related drive control system to facilitate the stable operation of the power system in the AGV. In addition, there are many other systems in the AGV vehicle, such as control systems, navigation and positioning systems, and safety systems. The power supply voltage required by such systems is different from the power supply voltage required by the power system. For example, the power supply voltage required by the power system in the AGV is 76.8V, while the power supply voltage required by the control system is 5V or 12V; for example, the power supply voltage required by the navigation and positioning system is also 5V or 12V. Therefore, in order to realize that the lithium battery device directly provides a higher DC voltage and a lower DC voltage for the AGV, it is necessary to set a voltage conversion circuit 50 in the lithium battery device. Among them, the cells in the lithium battery pack 10 are connected in series in sequence, and normally a nominal voltage of 76.8V will be output. Therefore, the voltage conversion circuit 50 needs to be implemented by a buck circuit, and the buck circuit can be implemented by a switch mode buck converter, a switch capacitor buck converter, a linear regulator, etc. By electrically connecting the input end of the voltage conversion circuit 50 to the output end of the lithium battery pack 10, the first voltage output by the lithium battery pack 10 is obtained; by electrically connecting the output end of the voltage conversion circuit 50 to the second power connection terminal A, the input first voltage is converted into a second voltage and then output to the second power connection terminal A.

[0065] Optionally, the second power connection terminal A of the battery box includes:

[0066] A first voltage connection terminal, the first voltage connection terminal is electrically connected to the lithium battery pack 10, and the first voltage connection terminal is used to output a first voltage;

[0067] A second voltage connection terminal, the second voltage connection terminal is electrically connected to the output terminal of the voltage conversion circuit 50, and the second voltage connection terminal is used to output a second voltage.

[0068] In this embodiment, the second power connection terminal A needs to output the first voltage and the second voltage respectively. Among them, the second power connection terminal A includes a first voltage connection terminal and a second voltage connection terminal. The first voltage connection terminal is electrically connected to the lithium battery pack 10 to directly output the first voltage output by the lithium battery pack 10. The second voltage connection terminal is electrically connected to the output terminal of the voltage conversion circuit 50 to output the second voltage processed by the voltage conversion circuit 50. It can be understood that the first power connection terminal and the second power connection terminal A are both provided with positive and negative ports corresponding to different voltages, and the positive and negative ports corresponding to different voltages correspond to the first voltage connection terminal and the second voltage connection terminal, so that the second power connection terminal A can stably output the second voltage and the first voltage, and the first power connection terminal can stably receive the second voltage and the first voltage.

[0069] Optionally, the main control circuit 20 is specifically configured as follows:

[0070] When the lithium battery device is in a discharging state, controlling the first voltage connection terminal to output a first voltage, and after a preset time, controlling the second voltage connection terminal to output a second voltage;

[0071] When the lithium battery device is in a stop-discharging state, the second voltage connection terminal is controlled to stop outputting the second voltage, and after a preset time, the first voltage connection terminal is controlled to stop outputting the first voltage.

[0072] It is understandable that in a conventional power supply mode, when the lithium battery device is in a discharge state, the second voltage connection terminal is first controlled to output the second voltage, and after a preset time, the first voltage connection terminal is controlled to output the first voltage; when the lithium battery device is in a stop discharge state, the first voltage connection terminal is controlled to stop outputting the first voltage, and after a preset time, the second voltage connection terminal is controlled to stop outputting the second voltage. This method of first applying low voltage and then high voltage, first lowering high voltage and then low voltage is a safer and more common practice. However, in this embodiment, the method of first applying high voltage and then low voltage, first lowering low voltage and then high voltage is adopted, that is, the second power supply connection terminal first outputs the first voltage and then the second voltage, and first stops the output of the second voltage and then stops the output of the first voltage pair. It can be seen from the above that the first voltage is the power supply voltage of the power system in the AGV. Therefore, in AGV applications that can respond quickly by adopting the method of outputting the first voltage first, such as emergency tasks or immediate needs on the production line, directly connecting the high voltage can speed up the startup speed and enable the AGV to enter the working state faster.

[0073] Optionally, the lithium battery device further includes a heat dissipation component D, which is disposed on one side of the battery box, is electrically connected to the main control circuit 20, and is used for dissipating heat from the voltage conversion circuit.

[0074] It is understandable that the AGV requires a variety of different power supply voltages, while the lithium battery pack 10 with cells arranged in series can only output one voltage, namely the first voltage. Therefore, the AGV must require a voltage conversion circuit 50 to meet the power supply voltage of different systems. Further, taking the process of converting a 76.8V high-voltage DC power supply into a 12V low-voltage DC power supply as an example, when different voltage conversion circuits 50 are used, the heat generated is also different. For example, a conversion efficiency of more than 90% can be achieved by using an efficient DC-DC converter (such as a switch mode power supply, SMPS). This means that most of the input power can be effectively converted into output power, and only a small part of the energy is lost in the form of heat. A linear regulator is used for step-down, and since its working principle is to dissipate excess energy through resistance, its efficiency is relatively low, and may be only 50%-60%, which will cause a large amount of heat to be generated. It is understandable that no matter whether a voltage conversion circuit 50 with high conversion efficiency or low conversion efficiency is used, a certain amount of heat will be generated. From the above content, it can be seen that the automatic guided transport vehicle has a battery storage compartment, and the battery storage compartment has an opening. Therefore, by setting the voltage conversion circuit 50 in the lithium battery device and further setting a heat dissipation component D, the influence of the heat generated by the voltage conversion circuit 50 on the AGV and the lithium battery device can be effectively reduced. The heat dissipation component D can be implemented by a heat sink and a fan. By connecting the controlled end of the fan to the main control circuit 20, the fan operation of the main control circuit 20 can be controlled.

[0075] refer to Figure 4 and Figure 5 In one embodiment of the present invention, a third power connection terminal C is further provided on the second surface of the battery box, and the third power connection terminal C is electrically connected to the lithium battery pack 10.

[0076] In this embodiment, in actual applications, there may be some AGVs that do not need to quickly replace the lithium battery device, or cannot quickly replace the lithium battery device. Therefore, a third power connection terminal C is also provided on the second side of the battery box, so that the lithium battery device on the AGV can be charged and discharged through the third power connection terminal C. The AGV can not only charge the lithium battery device through the third power connection terminal C, but also additionally set up a module corresponding to the power interface, and connect the third power connection terminal C to achieve power supply. By setting the third power connection terminal C, the flexibility of the AGV equipped with the lithium battery device is effectively improved.

[0077] Optionally, the lithium battery device further includes:

[0078] A power detection circuit 60, wherein the input end of the power detection circuit 60 is electrically connected to the second power connection terminal A and the third power connection terminal C respectively, and the output end of the power detection circuit 60 is electrically connected to the main control circuit 20, and the power detection circuit 60 is used to detect the connection status of the second power connection terminal A and the third power connection terminal C, and output a connection detection signal;

[0079] A power connection switching circuit 70, wherein a first end of the power connection switching circuit 70 is electrically connected to the lithium battery pack 10, a second end of the power connection switching circuit 70 is electrically connected to the second power connection terminal A, a third end of the power connection switching circuit 70 is electrically connected to the third power connection terminal C, and a controlled end of the power connection switching circuit 70 is electrically connected to the main control circuit 20;

[0080] Among them, the main control circuit 20 is also used to control the power connection switching circuit 70 to connect the path between the second power connection terminal A and the lithium battery pack 10, and disconnect the path between the third power connection terminal C and the lithium battery pack 10 according to the connection detection signal; or, the main control circuit 20 is also used to control the power connection switching circuit 70 to connect the path between the third power connection terminal C and the lithium battery pack 10, and disconnect the path between the second power connection terminal A and the lithium battery pack 10 according to the connection detection signal.

[0081] In this embodiment, the power detection circuit 60 can be implemented by a current detection circuit, a communication protocol circuit, a switch trigger circuit, etc. Among them, the power detection circuit 60 is implemented as a switch trigger circuit. By setting a switch trigger circuit at the second power connection terminal A and the third power connection terminal C respectively, when the second power connection terminal A is plugged into the first power connection terminal, or when the third power connection terminal C is plugged into the charging interface or the load, the switch trigger circuit will output a connection detection signal corresponding to the second power connection terminal A or the third power connection terminal C, so that the main control circuit 20 confirms the connection status of the second power connection terminal A or the third power connection terminal C according to the connection detection signal.

[0082] In this embodiment, the power connection switching circuit 70 can be implemented by using multiple switch circuits, relays or single-pole double-throw switch circuits. Taking the power connection switching circuit 70 as a single-pole double-throw switch circuit as an example, the first end of the single-pole double-throw switch circuit is electrically connected to the lithium battery pack 10, the second end is electrically connected to the second power connection terminal A, the third end is electrically connected to the third power connection terminal C, and the controlled end is electrically connected to the main control circuit 20, so as to realize the path connection between the lithium battery pack 10 and the second power connection terminal A and the third power connection terminal C, and the main control circuit 20 controls the power connection switching circuit 70. Further, when the main control circuit 20 confirms that the second power connection terminal A is in a connected state according to the connection detection signal, it will output a corresponding switching control signal to the power connection switching circuit 70, so that it conducts the path between the lithium battery pack 10 and the second power connection terminal A, and disconnects the path between the lithium battery pack 10 and the third power connection terminal C. When the main control circuit 20 confirms that the third power connection terminal C is in a connected state according to the connection detection signal, it will output a corresponding switching control signal to the power connection switching circuit 70 to connect the path between the lithium battery pack 10 and the third power connection terminal C, and disconnect the path between the lithium battery pack 10 and the second power connection terminal A.

[0083] Optionally, in practical applications, there is also a situation where both the second power connection terminal A and the third power connection terminal C are in a connected state. Therefore, the power connection switching circuit 70 needs to use a corresponding switch circuit that can simultaneously conduct the lithium battery pack 10 to the second power connection terminal A and the third power connection terminal C, and preset and adjust the control program in the main control circuit 20 to achieve the lithium battery pack 10 to charge and discharge through the second power connection terminal A and the third power connection terminal C at the same time.

[0084] The present invention further proposes an automatic guided transport vehicle, the automatic guided transport vehicle comprising a lithium battery device as described in any one of the above items; wherein the automatic guided transport vehicle has a battery storage compartment, a first surface of the battery storage compartment is provided with a first power connection terminal, an opposite surface of the first surface is an opening, and the first surface is parallel to the bottom surface of the automatic guided transport vehicle. It is worth noting that since the automatic guided transport vehicle of the present invention is based on the above-mentioned lithium battery device, the embodiments of the automatic guided transport vehicle of the present invention include all technical solutions of all embodiments of the above-mentioned lithium battery device, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0085] The present invention also proposes a battery replacement system, the battery replacement system comprising the above-mentioned automatic guided transport vehicle and a battery replacement device; wherein the battery replacement device has a traction replacement device corresponding to the connection component of the second surface of the battery box. It is worth noting that since the battery replacement system of the present invention is based on the above-mentioned automatic guided transport vehicle, the embodiments of the battery replacement system of the present invention include all technical solutions of all embodiments of the above-mentioned automatic guided transport vehicle, and the technical effects achieved are also exactly the same, which will not be repeated here.

[0086] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A lithium battery device, applied to an automatic guided vehicle, characterized in that: The automatic guided transport vehicle has a battery storage compartment, a first surface of the battery storage compartment is provided with a first power connection terminal, and an opposite surface of the first surface is an opening; the first surface is parallel to the bottom surface of the automatic guided transport vehicle; the lithium battery device includes: Lithium battery pack; A battery box, wherein a first surface of the battery box is provided with a second power connection terminal, and a second surface of the battery box is provided with a connection component; the second power connection terminal is electrically connected to the lithium battery pack to realize charging and discharging of the lithium battery pack; Among them, the first side of the battery box and the second side of the battery box are opposite sides; when the first power connection terminal is correspondingly connected to the second power connection terminal, the second side of the battery box corresponds to the opening of the battery accommodating compartment, so that the connecting component of the second side of the battery box is exposed at the opening of the battery box.

2. The lithium battery device according to claim 1, characterized in that: The lithium battery device further includes a battery management device, and the battery management device includes: Main control circuit; A temperature detection circuit, wherein an output end of the temperature detection circuit is electrically connected to the main control circuit, and the temperature detection circuit is used to output a temperature detection signal; A heating component, the heating component is arranged in the lithium battery pack, and the heating component is electrically connected to the main control circuit; Wherein, the main control circuit is used to output a heating control signal according to the temperature detection signal to control the operation of the heating component.

3. The lithium battery device according to claim 2, characterized in that: The lithium battery device also includes a voltage conversion circuit, a first end of the voltage conversion circuit is electrically connected to the lithium battery pack, a second end of the voltage conversion circuit is electrically connected to the second power connection end, and the voltage conversion circuit is used to convert the input first voltage into a second voltage and output it.

4. The lithium battery device according to claim 3, characterized in that: The second power connection terminal of the battery box includes: A first voltage connection terminal, the first voltage connection terminal is electrically connected to the lithium battery pack, and the first voltage connection terminal is used to output a first voltage; A second voltage connection terminal, the second voltage connection terminal is electrically connected to the output terminal of the voltage conversion circuit, and the second voltage connection terminal is used to output a second voltage.

5. The lithium battery device according to claim 4, characterized in that: The main control circuit is specifically configured as follows: When the lithium battery device is in a discharging state, controlling the first voltage connection terminal to output a first voltage, and after a preset time, controlling the second voltage connection terminal to output a second voltage; When the lithium battery device is in a stop-discharging state, the second voltage connection terminal is controlled to stop outputting the second voltage, and after a preset time, the first voltage connection terminal is controlled to stop outputting the first voltage.

6. The lithium battery device according to claim 3, characterized in that: The lithium battery device also includes a heat dissipation component, which is arranged on one side of the battery box, electrically connected to the main control circuit, and is used for heat dissipation of the voltage conversion circuit.

7. The lithium battery device according to any one of claims 2 to 6, characterized in that: The second surface of the battery box is also provided with a third power connection terminal, and the third power connection terminal is electrically connected to the lithium battery pack.

8. The lithium battery device according to claim 7, characterized in that: The lithium battery device also includes: a power detection circuit, wherein the input end of the power detection circuit is electrically connected to the second power connection end and the third power connection end respectively, and the output end of the power detection circuit is electrically connected to the main control circuit, and the power detection circuit is used to detect the connection status of the second power connection end and the third power connection end, and output a connection detection signal; A power connection switching circuit, wherein a first end of the power connection switching circuit is electrically connected to the lithium battery pack, a second end of the power connection switching circuit is electrically connected to the second power connection end, a third end of the power connection switching circuit is electrically connected to the third power connection end, and a controlled end of the power connection switching circuit is electrically connected to the main control circuit; In which, the main control circuit is also used to control the power connection switching circuit to connect the path between the second power connection terminal and the lithium battery pack and disconnect the path between the third power connection terminal and the lithium battery pack according to the connection detection signal; or, the main control circuit is also used to control the power connection switching circuit to connect the path between the third power connection terminal and the lithium battery pack and disconnect the path between the second power connection terminal and the lithium battery pack according to the connection detection signal.

9. An automated guided vehicle, characterized in that: The automatic guided transport vehicle comprises a lithium battery device as claimed in any one of claims 1 to 8; The automatic guided transport vehicle has a battery storage compartment, a first surface of the battery storage compartment is provided with a first power connection terminal, an opposite surface of the first surface is an opening, and the first surface is parallel to the bottom surface of the automatic guided transport vehicle.

10. A battery replacement system, characterized in that: The battery replacement system comprises an automated guided transport vehicle and a battery replacement device as claimed in claim 9; Wherein, the battery replacement device has a traction replacement device corresponding to the connection component on the second side of the battery box.

Images