Intelligent low-voltage power distribution system

Abstract

According to the multipath 12V platform output power supply configuration system, the positive electrode and the negative electrode of a 12V battery are directly connected to the positive electrode and the negative electrode of a 12V power distribution box, multipath 12V power supply is divided by connecting Mosfet loops in parallel, hardware can share a central control chip, a communication interface, a signal acquisition circuit and the like, a shell is mechanically shared, the cost and the weight are reduced, and the reliability of the system is improved. And meanwhile, external wire harness connection of a plurality of batteries is reduced, and an integrated 12V power supply is realized. The problems that in the prior art, two battery packs are high in cost and heavy in weight, wiring harness connection is complex, and arrangement in a whole vehicle is inconvenient are solved, and the technical effects of reducing cost and weight after integration, protecting batteries and the like are achieved.

Description

Technical Field

[0001] The present invention relates to an integrated DC intelligent low-voltage power distribution system with multiple 12V platform outputs, and particularly to the power supply field of high-level autonomous driving in the field of new energy vehicles. Background Art

[0002] In existing new energy vehicles, there is only one-way 12V power supply at the low-voltage load end. However, with the increasing requirements for vehicle intelligence and more complex power supply energy consumption, the safety of the vehicle's voltage power supply system becomes more prominent. Most of the problems with 12V power supply are as follows: 1. Short circuit of components in the 12V power supply network, resulting in blown fuses; 2. Insufficient power supply due to battery aging, and the vehicle cannot start; 3. Damage to the battery caused by excessive charging current; 4. High stability requirements of the intelligent driving module for 12V power supply; 5. The existing low-voltage power distribution box has a single function, lacking voltage stabilization output ability and battery management.

[0003] In existing solutions, using dual batteries and more fuses will increase costs and the integration complexity of the vehicle's 12V network. It has high costs, heavy weight, complex wire harness connections, and is not convenient for layout inside the vehicle. This application not only directly integrates the function of the BMS but also is compatible with the voltage stabilization output function of the 12V DC / DC converter. In addition, sharing a central controller can save additional controller costs. By monitoring the current and the circuit combination of MOSFETs, the function of an electronic e-fuse is achieved, and the existing physical fuses can be eliminated. The low-voltage power distribution box is directly connected to the battery using a pin connection method, without the need for additional wire harnesses to connect to the battery. Summary of the Invention

[0004] To overcome the above technical defects, the object of the present invention is to provide an intelligent low-voltage power distribution system, including: a 12V battery, a first charge and discharge circuit, a shunt device, a central control unit. The input end of the battery is connected to the first charge and discharge circuit, the first charge and discharge circuit is connected to the input end of the shunt device, the output end of the shunt device is respectively connected in parallel to multiple 12V power supply circuits, and the central control unit is communicatively connected to a CAN communication module, multiple 12V power supply circuits, a charging current limiting module, a DC regulated output module, the first charge and discharge circuit, and a 12V battery acquisition module; the shunt device is used to divide the current output by the 12V battery into multiple paths; the multiple 12V power supply circuits are used to provide multiple 12V output power supplies; the first charge and discharge circuit is used to control the charge and discharge of the 12V battery; the charging current limiting module is used to dynamically adjust the current and voltage output by the battery; the DC regulated output module is used to dynamically adjust the multiple 12V power supply voltages; the 12V battery acquisition module is used to acquire information of the battery; the central control unit controls the charge and discharge of the multiple 12V output power supplies; the central control unit protects the battery by cutting off the charge and discharge switch of the first charge and discharge circuit according to the battery information acquired by the 12V battery acquisition module; the central control unit controls the charging current limiting module to ensure stable charging of the battery; the central control unit controls the DC regulated output module to ensure the multiple 12V output power supplies.

[0005] Further, the multiple 12V power supply circuits specifically include 3 12V power supply circuits. The first 12V power supply circuit supplies power to the body domain 12V network, the second 12V power supply circuit supplies power to the power domain 12V network, and the third 12V power supply circuit supplies power to the intelligent driving domain 12V network; the first 12V power supply circuit includes a first discharge circuit, the second 12V power supply circuit includes a second charge and discharge circuit, and the third 12V power supply circuit includes a second discharge circuit.

[0006] Further, the first 12V power supply circuit further includes a first drive circuit. The first discharge circuit is connected to the first drive circuit through a Mosfet. The second 12V power supply circuit further includes a second drive circuit. The second charge and discharge circuit is connected to the second drive circuit through two parallel Mosfets. The third 12V power supply circuit further includes a third drive circuit. The second discharge circuit is connected to the third drive circuit through a Mosfet; the first charge and discharge circuit is connected to a fourth drive circuit through two parallel Mosfets. The central control module controls the charge and discharge switch through a Mosfet to control the charge and discharge of the first charge and discharge circuit, the first discharge circuit, the second charge and discharge circuit, and the second discharge circuit.

[0007] Further, the DC regulated output module includes a first filter circuit, a first boost / buck circuit, and a fifth drive circuit; the charging current limiting module includes a second filter circuit, a second boost / buck circuit, and a sixth drive circuit.

[0008] Further, the 12V battery acquisition module is also connected to a current shunt resistor Shunt. The 12V battery acquisition module is used to acquire information of the 12V storage battery, including: a cell voltage acquisition module for acquiring the voltage of a single cell of the storage battery, a total voltage acquisition module for acquiring the total voltage of the storage battery, a temperature acquisition module for acquiring the temperature of the storage battery and the temperature of the current shunt resistor Shunt, a cell equalization module for equalizing individual cells, and the current shunt resistor Shunt for detecting the output current of the storage battery.

[0009] Further, the 12V battery acquisition module is connected to the central control module through an SPI line, and the central control module controls the 12V battery acquisition module through SPI.

[0010] Further, the battery acquisition module is also connected to a system self-current consumption acquisition module for acquiring the current of the intelligent low-voltage power distribution system itself.

[0011] Further, an internal 5V auxiliary circuit is also included, which is used to provide power for the central control unit, each module, and each circuit of the intelligent low-voltage power distribution system, and is connected to the central control unit.

[0012] Further, the internal 5V auxiliary circuit is also connected to the PMIC. The PMIC is used for power supply management and power consumption management of the intelligent low-voltage power distribution system itself. The PMIC is connected to a 12V battery or an external 12V power supply, and the PMIC generates a 5V power supply through its own voltage regulation module and supplies it to the internal 5V working circuit.

[0013] Further, the first discharge loop is also connected to a first current detection module, the second charge and discharge loop is also connected to a second current detection module, the second discharge loop is also connected to a third current detection module. The first current detection module, the second current detection module, and the third current detection module are used to detect the current and feedback it to the central control unit.

[0014] Further, NTCs are respectively arranged on the first charge and discharge loop, the first discharge loop, the second charge and discharge loop, the second discharge loop, the charging current limiting module, the DC regulated output module, the 12V battery acquisition module, and the storage battery to detect the temperature.

[0015] Further, the battery acquisition module is connected to the storage battery through a pin connection module.

[0016] Further, the Mosfet can also be replaced by an IGBT or a relay.

[0017] Further, the current detection module can be replaced by a Hall current sensor.

[0018] Further, the shunt device is a copper bar.

[0019] This application not only directly integrates the functions of the BMS but also is compatible with the regulated output function of the 12V DC-DC. In addition, sharing a central controller can save additional controller costs. By monitoring the current and the circuit combination of the Mosfet, the function of the electronic e-fuse is realized, and the existing physical fuse can be cancelled. The low-voltage power distribution system is directly connected to the battery by means of pin connection, without additional wiring harness to connect the battery. When the battery ages, the battery charging performance is too low, or the battery temperature is too low, the central controller disconnects the battery charging circuit and closes the charging current limiting module to protect the stability of the battery and extend its service life. Description of the Drawings

[0020] Figure 1 Schematic diagram of an intelligent low-voltage power distribution box in an embodiment of the intelligent low-voltage power distribution system of the present invention;

[0021] Figure 2 For Figure 1 Internal control circuit schematic diagram of the intelligent low-voltage power distribution box in the embodiment;

[0022] Figure 3 Schematic diagram of the power supply management and power consumption management of the intelligent low-voltage power distribution system itself. Detailed Description of the Embodiments

[0023] The advantages of the present invention will be further elaborated below in conjunction with the drawings and specific embodiments.

[0024] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0025] The terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms "a", "the" and "said" used in the present disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0026] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to a determination".

[0027] In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a mechanical connection or an electrical connection, or it may be the communication inside two components. It may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] In the following description, the suffixes such as "module", "component", or "unit" used to represent elements are only for the convenience of the description of the present invention, and they do not have specific meanings themselves. Therefore, "module" and "component" can be used interchangeably.

[0029] See Figure 1 FIG. is a schematic diagram of an embodiment of the intelligent low-voltage power distribution system of the present application. It is an intelligent low-voltage power distribution box, which includes a housing, a circuit board disposed inside the housing, and a plurality of interfaces disposed on the side wall of the housing. The interfaces include a CAN interface, three 12V power supply interfaces, a 12V battery power input interface, and a ground wire port. The intelligent low-voltage power distribution box is directly mounted on the top of the battery, and NTC1 and NTC2 are provided to directly contact the battery. The ground wire port (B-) is clamped on the negative electrode of the 12V battery, the 12V battery power input interface is clamped on the positive electrode of the battery, a CAN interface is connected to the whole vehicle, and the three 12V output interfaces are respectively connected to the in-vehicle body domain 12V network, the power domain 12V network, and the intelligent driving domain 12V network. A first charge and discharge circuit, a shunt device, and a central control unit MCU are disposed on the circuit board. The input end of the battery is connected to the first charge and discharge circuit, the first charge and discharge circuit is connected to the input end of the shunt device, the output end of the shunt device is respectively connected in parallel to three 12V power supply circuits, and the central control unit is communicatively connected to a CAN communication module, three 12V power supply circuits, a charging current limiting module, a DC regulated output module, and the first charge and discharge circuit. The shunt device is used to divide the current output by the 12V battery into three paths, and the three 12V power supply circuits are used to provide three paths of 12V output power supply. The shunt device may be a copper busbar.

[0030] Further, for the 3-way 12V power supply circuit, the first 12V power supply circuit supplies power to the body domain 12V network, the second 12V power supply circuit supplies power to the powertrain domain 12V network, and the third 12V power supply circuit supplies power to the intelligent driving domain 12V network; the first 12V power supply circuit includes a first discharge circuit, the second 12V power supply circuit includes a second charge-discharge circuit, and the third 12V power supply circuit includes a second discharge circuit.

[0031] Further, the first discharge circuit is also connected to current sensor 1, the second charge-discharge circuit is also connected to current sensor 2, the second discharge circuit is also connected to current sensor 3, and current sensors 1-3 are communicatively connected to the MCU. Specifically, current sensor 1 is used to detect the current output to the body domain 12V network, current sensor 2 is used to detect the current output to the powertrain domain 12V network, and current sensor 3 is used to detect the current output to the intelligent driving domain 12V network. The current sensors can also be replaced with current detection modules.

[0032] The first charge-discharge circuit is used to control the charge and discharge of the 12V battery, and a bidirectional Mosfet is used to control the 12V of the battery to the copper bar inside the channel.

[0033] When the voltage of the battery is very low, the vehicle is requested via the CAN bus to charge the battery.

[0034] When the battery ages, the external charging voltage is too high, the battery charging performance is too low, or the battery's own temperature is too low, the central controller disconnects the battery's charging circuit and closes the charging current limiting module to protect the battery's stability, protect the battery, and extend its service life.

[0035] When the discharge current is too large or the battery is over-discharged, the Mosfet controlling the discharge circuit is disconnected to protect the battery. During charging, when the voltage of the battery is very high, the Mosfet controlling the charging circuit is disconnected to only allow discharge and prevent overcharging.

[0036] The charging current limiting module is used to dynamically adjust the current and voltage output by the battery, and the DC regulated output module is used to dynamically adjust the voltage of the multiple 12V output power supplies.

[0037] Further, NTC, NTC7, NTC3, NTC4, NTC5, NTC8, and NTC6 are respectively arranged near the 12V battery acquisition module, the first charge-discharge circuit, the first discharge circuit, the second charge-discharge circuit, the second discharge circuit, the charging current limiting module, and the DC regulated output module. The NTC is used to detect the temperature of the corresponding module. The temperature of each power device is monitored through the NTC. When the temperature is too high, the central control unit sends a request to the vehicle to reduce the current consumption of the vehicle.

[0038] See Figure 2 It is the internal circuit control diagram of the intelligent low-voltage distribution box.

[0039] The first 12V power supply circuit further includes a first drive circuit. The first discharge loop is connected to the first drive circuit through a control discharge circuit Mosfet. The second 12V power supply circuit further includes a second drive circuit. The second charge-discharge loop is connected to the second drive circuit through two parallel Mosfets (control discharge circuit Mosfet and control charge circuit Mosfet). The third 12V power supply circuit further includes a third drive circuit. The second discharge loop is connected to the third drive circuit through a control discharge circuit Mosfet. The first charge-discharge loop is connected to a fourth drive circuit through two parallel Mosfets (control discharge circuit Mosfet and control charge circuit Mosfet). The first to fourth drive circuits are respectively connected to the MCU. The central control unit MCU can control the on / off of the charge-discharge loop and the discharge loop according to instructions, and uses the unidirectional conduction property of the Mosfet to achieve the control of the on / off and direction of the current.

[0040] Further, the first discharge loop provides 12V power of the battery to the body domain 12V network. When a short circuit occurs in the body domain, the power supply to the body domain is disconnected (protected by a fuse) to ensure the power supply of the 12V network for intelligent driving.

[0041] Further, the second charge-discharge loop provides 12V power of the battery to the power domain 12V network. When a short circuit occurs in the body domain, the power supply to the power domain 12V network is disconnected (protected by a fuse) to ensure the power supply of the 12V network for intelligent driving.

[0042] Further, the second discharge loop provides 12V power of the battery to the intelligent driving domain 12V network. When a short circuit occurs in the intelligent driving domain 12V network, the power supply to the body domain is disconnected (protected by a fuse) to ensure the power supply of the 12V network for intelligent driving.

[0043] Further, the DC regulated output module includes a first filter circuit, a first step-up / step-down circuit and a fifth drive circuit. When the battery voltage is too low or the current is unstable, the DC regulated output module is turned on to output 12V power to the power domain 12V network and the 12V network for intelligent driving.

[0044] Further, the charging current limiting module includes a second filter circuit, a second boost / buck circuit, and a sixth drive circuit. When the charging voltage of the storage battery is too high, the circuit in the charging direction is disconnected to protect the battery, and the charging current limiting module is turned on. The central control unit dynamically adjusts the charging current limiting module according to the voltage information and current information collected by the total voltage acquisition module to output a stable charging current and voltage, thereby protecting the battery.

[0045] The 12V battery acquisition module: The battery acquisition circuit is divided into two parts. The first part is directly connected to the storage battery, temperature resistors NTC1 and NTC2 through a pin module, which reduces the extra wiring harness. This part of the circuit consists of an acquisition circuit, an equalization circuit, a filter circuit, etc., and is directly connected to the pins of the acquisition chip. The second part is connected to the central control chip MCU through an SPI line, and the battery information is acquired through SPI control. Among them, the 12V battery acquisition module further includes a cell voltage acquisition module for acquiring the voltage of a single cell; a temperature acquisition module for acquiring the battery temperature and the temperature of the current shunt resistor shunt; the current shunt resistor shunt for measuring the total current of the battery's power supply to the entire vehicle; a total voltage acquisition module for acquiring the total voltage information; and a control circuit (the cell equalization module is used to equalize a single cell).

[0046] The 12V battery acquisition module is also connected to the system's own current consumption acquisition module. For details, see Figure 3 , and the system's own current consumption acquisition module is used to measure the working power consumption of the system itself, and only the discharging direction is used.

[0047] Further, see Figure 3 , the internal 5V auxiliary circuit is also connected to the PMIC, and the PMIC is used for the power supply management and power consumption management of the intelligent low-voltage power distribution system itself. The PMIC is connected to the 12V battery or an external 12V power supply, and the PMIC generates a 5V power supply through its own voltage stabilization module and supplies it to the internal 5V working circuit.

[0048] The MCU is also connected to the internal 5V auxiliary circuit, and the internal 5V auxiliary circuit provides power for the MCU, each drive circuit, each acquisition circuit, the CAN transceiver, etc.

[0049] The MCU is also communicatively connected to each NTC, and adjusts the circuit drive and battery output limit by collecting the temperature.

[0050] The central control unit MCU calculates the next working mode and operating parameters according to the vehicle working instructions received by the CAN transceiver and the real-time data fed back by the acquisition circuit, and controls the on / off of the 12V output port.

[0051] The CAN communication module completes the bidirectional data transmission between the external and the intelligent low-voltage power distribution box.

[0052] The central control unit MCU can control the on / off of the charge and discharge circuits and the discharge circuit according to instructions. The unidirectional conductivity of the Mosfet is utilized to achieve the control of the on / off and direction of the current.

[0053] The intelligent low-voltage distribution box of the present invention works through the following process:

[0054] At the start of operation, the intelligent low-voltage distribution box maintains a multi-channel 12V output under the power supply of the battery. The battery acquisition module collects the voltage and temperature of the battery cells, and estimates the state of the lithium battery through relevant signals. When the voltage difference between the battery cells is too large, or when the battery cell voltage is overvoltage / undervoltage / overtemperature, relevant protection is carried out, thereby monitoring the battery, the 12V output voltage and current, and its own state, and sending them to the CAN network to the entire vehicle.

[0055] The central control module calculates the next working mode and operating parameters of the intelligent low-voltage distribution box according to the vehicle working instructions received by the CAN transceiver and the real-time data feedback by the acquisition circuit, and controls the drive circuit to protect the battery, and issues the limit information for external output through the CAN bus. The intelligent low-voltage distribution box still maintains a 12V output in the parking state.

[0056] The central control module calculates the state of the battery according to the 12V battery acquisition module. If the voltage difference between the individual battery cells of the battery is too large, the central control module turns on the balancing circuit to balance the battery cells and protect the battery. At the same time, it calculates the remaining energy of the battery and the subsequent battery power supply capacity according to the battery information such as current, voltage, and temperature, and sends them to the entire vehicle.

[0057] When the charging voltage of the battery is unstable, the central control module disconnects the charging current and turns on the charging current limiting module to ensure a stable charge for the battery according to the real-time data feedback by the 12V battery acquisition module.

[0058] The central control module is based on the acquisition circuit ( Figure 2 , 12V battery acquisition module: battery cell voltage, total voltage, temperature circuit, current) to turn on / off the charge and discharge circuit or turn on the DC voltage stabilizing output module according to the real-time data feedback, to ensure the 12V output and guarantee the safety of the vehicle and the battery.

[0059] In the sleep state, the central control module will wake up periodically and collect the real-time data feedback by the acquisition circuit ( Figure 2 , 12V battery acquisition module: battery cell voltage, total voltage, temperature circuit, current), and still ensure the safety of the 12V output even when parked.

[0060] In the present invention, the power circuit is integrated at the hardware level. The first part of the power circuit can switch the current on and off. When the central control unit closes the Mosfet in the discharge direction, the voltage and current of the battery are given to the external interface through the output port. In the second part, the central control unit can select the on and off of that output port through the circuit. When the output current of a certain path is too large, the discharge Mosfet of this path can be disconnected to cut off the large current outside. In the third part, when the battery is under-voltage or a short circuit occurs in one of the output ports, the central control unit can start the DC voltage stabilization output module and close the short circuit port to ensure stable power supply for the vehicle power module and the intelligent driving module, preventing the vehicle from stalling and the steering system from being uncontrollable. In the fourth part, the central control unit can monitor the real-time state of the battery through the 12V battery acquisition module, output the battery information to the whole vehicle, and realize the function of battery management. In the fourth part, when the charging state of the battery from the outside is unstable, the central control module can disconnect the Mosfet in the charging direction and start the charging current limiting module, so as to ensure that the battery can be stably charged and extend the battery life. In the fifth part, the NTC is used to monitor the temperature of each power device. When the temperature is too high, the central control unit sends a request to the whole vehicle to reduce the current consumption of the whole vehicle. In the sixth part, the power supply of the whole system comes from the battery.

[0061] The present invention provides a power supply configuration (control) box with multiple 12V platform outputs (multiple 12V connection ports and 1 ground connection port). By directly connecting the positive and negative poles of the 12V battery to the positive and negative poles of the 12V distribution box, multiple 12V power supplies are divided through a parallel Mosfet circuit. The hardware can share a central control chip, a communication interface, a signal acquisition circuit, etc. Mechanically, a common housing is shared, reducing costs and weight, and at the same time reducing the connection of multiple external battery harnesses, realizing an integrated 12V power supply. It solves the problems of high cost, heavy weight, complex harness connection and inconvenient layout in the vehicle in the prior art, and achieves the technical effects of cost reduction, weight reduction and battery protection after integration.

[0062] It should be noted that the embodiments of the present invention have good implementability and are not any form of limitation to the present invention. Any person skilled in the art may use the disclosed technical content to change or modify it into an equivalent effective embodiment. However, as long as it does not depart from the technical content of the present invention, any modification, equivalent change or modification made to the above embodiments according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. An intelligent low-voltage power distribution system, characterized in that, It includes: a 12V battery, a first charge and discharge circuit, a shunt device, a central control unit. The input end of the battery is connected to the first charge and discharge circuit. The first charge and discharge circuit is connected to the input end of the shunt device. The output end of the shunt device is respectively connected in parallel to multiple 12V power supply circuits. The central control unit is communicatively connected to a CAN communication module, multiple 12V power supply circuits, a charging current limiting module, a DC regulated output module, the first charge and discharge circuit, and a 12V battery acquisition module. The shunt device is used to divide the current output by the 12V battery into multiple paths. The multiple 12V power supply circuits are used to provide multiple 12V output power supplies. The first charge and discharge circuit is used to control the charge and discharge of the 12V battery. The charging current limiting module is used to dynamically adjust the current and voltage output by the battery. The DC regulated output module is used to dynamically adjust the multiple 12V power supply voltages. The 12V battery acquisition module is used to acquire information of the battery. The central control unit controls the charge and discharge of the multiple 12V output power supplies. The central control unit protects the battery by cutting off the charge and discharge switch of the first charge and discharge circuit according to the battery information acquired by the 12V battery acquisition module. The central control unit controls the charging current limiting module to ensure stable charging of the battery. The central control unit controls the DC regulated output module to ensure the multiple 12V output power supplies.

2. The intelligent low-voltage power distribution system according to claim 1, wherein The multiple 12V power supply circuits specifically include 3 12V power supply circuits. The first 12V power supply circuit supplies power to the body domain 12V network. The second 12V power supply circuit supplies power to the power domain 12V network. The third 12V power supply circuit supplies power to the intelligent driving domain 12V network. The first 12V power supply circuit includes a first discharge circuit. The second 12V power supply circuit includes a second charge and discharge circuit. The third 12V power supply circuit includes a second discharge circuit.

3. The intelligent low-voltage power distribution system according to claim 2, wherein The first 12V power supply circuit further includes a first drive circuit. The first discharge circuit is connected to the first drive circuit through a Mosfet. The second 12V power supply circuit further includes a second drive circuit. The second charge and discharge circuit is connected to the second drive circuit through two parallel Mosfets. The third 12V power supply circuit further includes a third drive circuit. The second discharge circuit is connected to the third drive circuit through a Mosfet. The first charge and discharge circuit is connected to a fourth drive circuit through two parallel Mosfets. The central control module controls the charge and discharge switch through a Mosfet to control the charge and discharge of the first charge and discharge circuit, the first discharge circuit, the second charge and discharge circuit, and the second discharge circuit.

4. The intelligent low-voltage power distribution system according to claim 1, characterized in that, The DC regulated output module includes a first filter circuit, a first boost / buck circuit, and a fifth drive circuit. The charging current limiting module includes a second filter circuit, a second boost / buck circuit, and a sixth drive circuit.

5. The intelligent low-voltage power distribution system according to claim 1, characterized in that, The 12V battery acquisition module is also connected to the current shunt resistor Shunt. The 12V battery acquisition module is used to acquire information of the 12V storage battery, including: the cell voltage acquisition module is used to acquire the voltage of a single cell of the storage battery, the total voltage acquisition module is used to acquire the total voltage of the storage battery, the temperature acquisition module is used to acquire the temperature of the storage battery and the temperature of the current shunt resistor Shunt, the cell equalization module is used to equalize single cells, and the current shunt resistor Shunt is used to detect the output current of the storage battery.

6. The intelligent low-voltage power distribution system according to claim 5, characterized in that The 12V battery acquisition module is connected to the central control module through an SPI line, and the central control module controls the 12V battery acquisition module through SPI.

7. The intelligent low-voltage power distribution system according to claim 6, characterized in that, The battery acquisition module is also connected to the system self-current consumption acquisition module, and is used to acquire the current of the intelligent low-voltage power distribution system itself.

8. The intelligent low-voltage power distribution system according to claim 1, wherein, An internal 5V auxiliary circuit is further included, which is used to provide power for the central control unit, each module, and each circuit of the intelligent low-voltage power distribution system, and is connected to the central control unit.

9. The intelligent low-voltage power distribution system according to claim 8, characterized in that The internal 5V auxiliary circuit is also connected to the PMIC, and the PMIC is used for power supply management and power consumption management of the intelligent low-voltage power distribution system itself.

10. The intelligent low-voltage power distribution system according to claim 2, wherein, The first discharge circuit is also connected to the first current detection module, the second charge and discharge circuit is also connected to the second current detection module, the second discharge circuit is also connected to the third current detection module, and the first current detection module, the second current detection module, and the third current detection module are used to detect current and feedback it to the central control unit.

11. The intelligent low-voltage power distribution system according to claim 1, characterized in that, NTCs are respectively arranged on the first charge and discharge circuit, the first discharge circuit, the second charge and discharge circuit, the second discharge circuit, the charge current limiting module, the DC regulated output module, the 12V battery acquisition module, and the storage battery to detect temperature.

12. The intelligent low-voltage power distribution system according to claim 6, wherein The battery acquisition module is connected to the storage battery through a pin connection module.

13. The intelligent low-voltage power distribution system according to claim 3, wherein The Mosfet can also be replaced by an IGBT or a relay.

14. For the intelligent low-voltage power distribution system according to claim 9, the current detection module can be replaced by a Hall current sensor.

15. For the intelligent low-voltage power distribution system according to any one of claims 1-14, the shunt device is a copper busbar.

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