A power management system of a new energy vehicle, a vehicle and a power management method

Abstract

This invention discloses a power management system for a new energy vehicle, a vehicle, and a power management method. The power management system includes a signal acquisition module, a power management module, a magnetic latching relay, and a redundant switch. The output of the signal acquisition module is connected to the input of the power management module, and the output of the power management module is connected to the magnetic latching relay. The power management module receives parameters of the low-voltage battery acquired by the signal acquisition module and controls the magnetic latching relay to turn on or off via a control signal output from its output. The power management module is connected to the redundant switch, and controls the magnetic latching relay to turn on or off based on the on / off state of the redundant switch. When the magnetic latching relay is on or off, the electrical equipment is connected or disconnected from the low-voltage battery. By incorporating a magnetic latching relay into the power management system, and by controlling the magnetic latching relay's on / off state based on the low-voltage battery parameters, the power management module prevents the low-voltage battery from operating with a low charge.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle control technology, and in particular to a power management system, vehicle, and power management method for a new energy vehicle. Background Technology

[0002] Lithium batteries, as low-voltage batteries for new energy vehicles, have advantages such as high energy density, high power density, and long cycle life.

[0003] However, new energy commercial vehicles have many controllers and large static current, and lithium batteries, as low-voltage batteries in new energy commercial vehicles, may be subject to power loss. Summary of the Invention

[0004] This invention provides a power management system, vehicle, and power management method for new energy vehicles to solve the problem of low-voltage battery depletion.

[0005] According to one aspect of the present invention, a power management system for a new energy vehicle is provided, characterized in that it includes: a signal acquisition module, a power management module, a magnetic latching relay, and a redundant switch;

[0006] The signal acquisition module is connected to the low-voltage battery and is used to acquire the parameters of the low-voltage battery. The output terminal of the signal acquisition module is connected to the input terminal of the power management module, and the output terminal of the power management module is connected to the magnetic latching relay. The power management module is used to receive the parameters of the low-voltage battery acquired by the signal acquisition module and to control the magnetic latching relay to be turned on or off through the control signal output from the output terminal. The power management module is also connected to the redundant switch and is used to control the magnetic latching relay to be turned on or off according to the on or off state of the redundant switch.

[0007] The magnetic latching relay is connected between the low-voltage battery and the electrical device. When the magnetic latching relay is turned on, the electrical device is connected to the low-voltage battery, and the low-voltage battery provides power to the electrical device. When the magnetic latching relay is turned off, the electrical device is disconnected from the low-voltage battery, and the low-voltage battery does not provide power to the electrical device.

[0008] Optionally, the power management system also includes a vehicle control module, which is activated by a key switch or a charging gun. The vehicle control module is connected to the power management module. After activation, the vehicle control module controls the control signals output by the power management module to control the on or off of the magnetic latching relay.

[0009] Optionally, the power management module includes a wake-up unit, which is used to periodically wake up the power management module according to the characteristics of the low-voltage battery.

[0010] Optionally, when the key switch is closed, the power management module judges the parameters of the low-voltage battery collected by the signal acquisition module. When the power management module determines that the parameters of the low-voltage battery meet the first preset condition, the power management module controls the magnetic latching relay to turn on; when the power management module determines that the parameters of the low-voltage battery do not meet the first preset condition, the power management module controls the magnetic latching relay to turn off.

[0011] Optionally, the first preset conditions include that the low-voltage battery charge is not lower than a first threshold, the low-voltage battery terminal voltage is not lower than a second threshold, the low-voltage battery cell voltage is not greater than a third threshold, the cell temperature is within a preset range, and there are no other safety faults.

[0012] Optionally, when the key switch is closed and the key switch or the charging gun is active, when the vehicle control module is activated and sends a control signal to turn off the magnetic latching relay, the vehicle control module controls the magnetic latching relay to turn off through the power management module; when the vehicle control module is not activated, the power management module controls the magnetic latching relay to turn on.

[0013] Optionally, when the key switch is closed, the redundant switch is closed and held for a preset time. When the key switch and the charging gun are invalid, the power management module controls the magnetic latching relay to turn off. When the key switch or the charging gun is valid, if the vehicle control module is activated and sends a control signal to turn off the magnetic latching relay, the vehicle control module controls the magnetic latching relay to turn off through the power management module. If the vehicle control module is not activated, the power management module controls the magnetic latching relay to turn on.

[0014] Optionally, the key switch is disconnected, and the wake-up unit periodically wakes up the power management module according to the characteristics of the low-voltage battery. When the power management module is woken up, it judges the parameters of the low-voltage battery collected by the signal acquisition module. When the power management module determines that the parameters of the low-voltage battery meet the first preset condition, it controls the magnetic latching relay to turn on; when the power management module determines that the parameters of the low-voltage battery do not meet the first preset condition, it controls the magnetic latching relay to turn off.

[0015] According to another aspect of the present invention, a vehicle is provided, the vehicle including the power management system.

[0016] According to another aspect of the present invention, a power management method is provided, the method comprising:

[0017] When the key switch is closed, the power management module judges the parameters of the low-voltage battery collected by the signal acquisition module. When the power management module determines that the parameters of the low-voltage battery meet the first preset condition, the power management module controls the magnetic latching relay to turn on; when the power management module determines that the parameters of the low-voltage battery do not meet the first preset condition, the power management module controls the magnetic latching relay to turn off.

[0018] When the key switch is closed and the key switch or the charging gun is active, when the vehicle control module is activated and sends a control signal to turn off the magnetic latching relay, the vehicle control module controls the magnetic latching relay to turn off through the power management module. When the vehicle control module is not activated, the power management module controls the magnetic latching relay to turn on.

[0019] When the key switch is closed, the redundant switch is closed and held for a preset time. When the key switch and the charging gun are invalid, the power management module controls the magnetic latching relay to turn off. When the key switch or the charging gun is valid, if the vehicle control module is activated and sends a control signal to turn off the magnetic latching relay, the vehicle control module controls the magnetic latching relay to turn off through the power management module. If the vehicle control module is not activated, the power management module controls the magnetic latching relay to turn on.

[0020] When the key switch is turned off, the wake-up unit periodically wakes up the power management module based on the characteristics of the low-voltage battery. When the power management module is woken up, it judges the parameters of the low-voltage battery collected by the signal acquisition module. When the power management module determines that the parameters of the low-voltage battery meet the first preset condition, it controls the magnetic latching relay to turn on; when the power management module determines that the parameters of the low-voltage battery do not meet the first preset condition, it controls the magnetic latching relay to turn off.

[0021] The technical solution of this invention provides a power management system including a signal acquisition module, a power management module, a magnetic latching relay, and a redundant switch. The signal acquisition module is connected to a low-voltage battery and is used to acquire the parameters of the low-voltage battery. The output terminal of the signal acquisition module is connected to the input terminal of the power management module, and the output terminal of the power management module is connected to the magnetic latching relay. The power management module receives the parameters of the low-voltage battery acquired by the signal acquisition module and controls the magnetic latching relay to be turned on or off through a control signal output from its output terminal. The redundant switch is connected to the power management module, and the power management module controls the magnetic latching relay to be turned on or off according to the on or off state of the redundant switch. The magnetic latching relay is connected between the low-voltage battery and the electrical device. When the magnetic latching relay is on, the electrical device is connected to the low-voltage battery, and the low-voltage battery provides power to the electrical device. When the magnetic latching relay is off, the electrical device is disconnected from the low-voltage battery, and the low-voltage battery does not provide power to the electrical device. The power management system is equipped with a magnetic latching relay. The power management module controls the magnetic latching relay to turn on or off according to the low-voltage battery parameters, which avoids the low-voltage battery from running out of power and solves the problem of low-voltage battery running out of power.

[0022] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of a power management system structure provided in an embodiment of the present invention;

[0025] Figure 2 This is a circuit diagram of a power management system provided in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of another power management system structure provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the power management module structure provided in an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the working process of the power management system provided in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of a vehicle structure provided in an embodiment of the present invention;

[0030] Figure 7 This is a flowchart of a power management method provided in an embodiment of the present invention. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] Figure 1 This is a schematic diagram of a power management system structure provided in an embodiment of the present invention, such as... Figure 1As shown, the power management system 100 includes a signal acquisition module 110, a power management module 120, a magnetic latching relay 130, and a redundant switch 140. The signal acquisition module 110 is connected to a low-voltage battery and is used to acquire the parameters of the low-voltage battery. The output terminal of the signal acquisition module 110 is connected to the input terminal of the power management module 120, and the output terminal of the power management module 120 is connected to the magnetic latching relay 130. The power management module 120 is used to receive the parameters of the low-voltage battery acquired by the signal acquisition module 110 and control the magnetic latching relay 130 through the control signal output from its output terminal. The power management module 120 is connected to the redundant switch 140 and is also used to control the on or off of the magnetic latching relay 130 according to the on or off state of the redundant switch 140. The magnetic latching relay 130 is connected between the low-voltage battery and the electrical equipment. When the magnetic latching relay 130 is on, the electrical equipment is connected to the low-voltage battery and the low-voltage battery provides power to the electrical equipment. When the magnetic latching relay 130 is off, the electrical equipment is disconnected from the low-voltage battery and the low-voltage battery does not provide power to the electrical equipment.

[0034] In this embodiment, power management refers to the effective allocation of power to different electrical devices. The power management system can extend battery life by reducing energy consumption when devices are idle. The signal acquisition module 110 is connected to the low-voltage battery and is used to acquire the battery's parameters, including current and voltage parameters. The signal acquisition module 110 can use a Hall sensor to acquire the battery's current parameters and a voltage sensor to acquire the battery's voltage parameters. The power management module 120, as the core module of the power management system, is connected to the signal acquisition module 110 and is used to receive the low-voltage battery parameters acquired by the signal acquisition module 110. The power management module 120 processes the low-voltage battery parameters and outputs a control signal, which is used to control the magnetic latching relay 130 to turn on or off. For example, the control signal can be represented by a high level or a low level. Simultaneously, the power management module 120 confirms the status information fed back by the magnetic latching relay 130 to ensure the accuracy of the magnetic latching relay 130's status. The redundant switch 140 can input switch information to the power management module 120. The power management module 120 controls the magnetic latching relay 130 to turn on or off according to the switch information output by the redundant switch 140. The redundant switch 140 can be turned on manually.

[0035] Figure 2 This is a circuit diagram of a power management system provided in an embodiment of the present invention, such as... Figure 2As shown, the information acquisition module 110 uses a Hall sensor and a voltage sensor to acquire the current and voltage of the low-voltage battery, respectively. The Hall sensor is connected to the positive terminal of the low-voltage battery, and the voltage sensor is connected to both the positive and negative terminals of the low-voltage battery. The negative terminal of the low-voltage battery is grounded, and the positive terminal of the low-voltage battery is connected to the power management module 120 and the magnetic latching relay 130. The low-voltage battery supplies power to the power management module 120 and the magnetic latching relay 130. The redundant switch 140 is a self-resetting switch and is connected to the power management module 120. The power management module 120 controls the magnetic latching relay 130 based on the switch information received from the redundant switch 140. The magnetic latching relay 130 is connected between the low-voltage battery and the electrical equipment to control the low-voltage battery to supply power to the electrical equipment. The electrical equipment includes a distribution box, a DC-DC converter, etc. For example, the distribution box is connected to the vehicle's equipment to distribute power to the vehicle's equipment.

[0036] In this embodiment, the signal acquisition module 110 acquires the parameters of the low-voltage battery and sends the low-voltage battery parameters to the power management module 120. The power management module 120 processes the low-voltage battery parameters and outputs a control signal. When the control signal output by the power management module 120 is a high-level signal, the magnetic latching relay 130 is turned on, and the low-voltage battery provides power to the electrical equipment. When the control signal output by the power management module 120 is a low-level signal, the magnetic latching relay 130 is turned off, and the low-voltage battery does not provide power to the electrical equipment.

[0037] This embodiment provides a power management system including a signal acquisition module, a power management module, a magnetic latching relay, and a redundant switch. The signal acquisition module is connected to a low-voltage battery and is used to acquire the parameters of the low-voltage battery. The output terminal of the signal acquisition module is connected to the input terminal of the power management module, and the output terminal of the power management module is connected to the magnetic latching relay. The power management module receives the parameters of the low-voltage battery acquired by the signal acquisition module and controls the magnetic latching relay to be turned on or off through a control signal output from its output terminal. The redundant switch is connected to the power management module, and the power management module controls the magnetic latching relay to be turned on or off according to the on or off state of the redundant switch. The magnetic latching relay is connected between the low-voltage battery and the electrical device. When the magnetic latching relay is on, the electrical device is connected to the low-voltage battery, and the low-voltage battery provides power to the electrical device. When the magnetic latching relay is off, the electrical device is disconnected from the low-voltage battery, and the low-voltage battery does not provide power to the electrical device. The power management system is equipped with a magnetic latching relay. The power management module controls the magnetic latching relay to turn on or off according to the low-voltage battery parameters, which avoids the low-voltage battery from running out of power and solves the problem of low-voltage battery running out of power.

[0038] Based on the above embodiments, Figure 3This is a schematic diagram of another power management system structure provided in an embodiment of the present invention, such as... Figure 3 As shown, the power management system also includes a vehicle control module 310, which is connected to the power management module 120. The vehicle control module 310 is activated by a key switch or a charging gun. After activation, the vehicle control module 310 controls the control signals output by the power management module 120 to control the on / off state of the magnetic latching relay 130. The control signal can be a broadcast signal. When the vehicle control module 310 is not activated, it cannot output control signals, and therefore cannot control the control signals output by the power management module 120.

[0039] In this embodiment, Figure 4 This is a schematic diagram of the power management module structure provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the power management module 120 includes a wake-up unit 410, which is used to periodically wake up the power management module 120 according to the characteristics of the low-voltage battery. The duration of each wake-up is limited by the executable logic judgments and data storage of the power management module 120. The low-voltage battery characteristics can be represented by low-voltage battery parameters. For example, the wake-up period of the power management module 120 is obtained based on the MAP linear interpolation table of the remaining battery charge (SOC), as shown in Table 1. The wake-up period of the power management module 120 shortens as the low-voltage battery charge decreases.

[0040] Table 1

[0041] SOC Wake-up cycle (h) 0 1 20 1 40 5 60 8 80 10 100 12

[0042] In this embodiment, when the key switch is closed, the vehicle is in the ON position, and when the key switch is open, the vehicle is in the OFF position. The operation of the power management system is different when the vehicle is in the ON or OFF position.

[0043] For example, Figure 5 This is a schematic diagram of the working process of the power management system provided in an embodiment of the present invention, as shown below. Figure 5 As shown, after the key switch is closed, the vehicle is in the ON position, and all functions of the power management module 120 are online, checking and reporting the low-voltage battery status. The power management module 120 judges the parameters of the low-voltage battery collected by the signal acquisition module 110. When the power management module 120 determines that the parameters of the low-voltage battery meet the first preset condition, the power management module 120 controls the magnetic latching relay 130 to conduct; when the power management module 120 determines that the parameters of the low-voltage battery do not meet the first preset condition, the power management module 120 controls the magnetic latching relay 130 to turn off.

[0044] In this embodiment, the low-voltage battery is generally a battery pack. The first preset conditions include that the low-voltage battery's charge is not lower than a first threshold, the low-voltage battery's terminal voltage is not lower than a second threshold, the low-voltage battery's individual cell voltage is not greater than a third threshold, the individual cell temperature is within a preset range, and there are no other safety faults. Taking a 24V lithium battery as an example, the first threshold for the low-voltage battery's state of charge (SOC) is 30%, the second threshold for the low-voltage battery's terminal voltage is 22V, the third threshold for the low-voltage battery's individual cell voltage is 200mV, and the low-voltage battery's individual cell temperature does not exceed -40℃ to 60℃.

[0045] In this embodiment, the vehicle is in the ON position, and the key switch or charging gun is active. When the vehicle control module 310 is activated and sends a control signal to turn off the magnetic latching relay 130, the vehicle control module 310 controls the magnetic latching relay 130 to turn off via the power management module 120. When the vehicle control module 310 is not activated, the power management module 120 controls the magnetic latching relay 130 to turn on. The condition that "the key switch or charging gun is active, and the vehicle control module 310 is activated and sends a control signal to turn off the magnetic latching relay 130" is the second preset condition. When the electrical management system meets the second preset condition, the vehicle control module 310 controls the magnetic latching relay 130 to turn off via the power management module 120. At this time, the low-voltage battery has no output current. When the electrical management system does not meet the second preset condition, the power management module 120 controls the magnetic latching relay 130 to turn on. At this time, the power management module 120 can normally perform functions such as low-voltage battery system status checks and reporting.

[0046] In this embodiment, the vehicle is in the ON position, and the redundant switch 140 is closed and maintained for a preset time, for example, 5 minutes. When the ignition switch and charging gun are inactive, the power management module 120 controls the magnetic latching relay 130 to turn off. When the ignition switch or charging gun is active, if the vehicle control module 310 is activated and sends a control signal to turn off the magnetic latching relay 130, the vehicle control module 310 controls the magnetic latching relay 130 to turn off through the power management module 120. If the vehicle control module 310 is not activated, the power management module 120 controls the magnetic latching relay 130 to turn on. The conditions "the redundant switch 140 is closed and maintained for a preset time, while the ignition switch and charging gun are inactive" and "the redundant switch 140 is closed and maintained for a preset time, the ignition switch and charging gun are active, and the vehicle control module 310 is activated and sends a control signal to turn off the magnetic latching relay 130" constitute the third preset condition. When the third preset condition is met, the magnetic latching relay 130 is turned off, and the low-voltage battery has no output current. When the third preset condition is not met, the magnetic latching relay 130 is turned on, and the power management module 120 can normally perform functions such as checking and reporting the status of the low-voltage battery system.

[0047] In this embodiment, the vehicle is in the OFF position. The wake-up unit 410 periodically wakes up the power management module 120 according to the characteristics of the low-voltage battery. When the power management module 120 is woken up, it judges the parameters of the low-voltage battery collected by the signal acquisition module 110. When the power management module 120 determines that the parameters of the low-voltage battery meet the first preset condition, it controls the magnetic latching relay 130 to turn on. When the power management module 120 determines that the parameters of the low-voltage battery do not meet the first preset condition, it controls the magnetic latching relay 130 to turn off.

[0048] In this embodiment, the battery management system executes different control modes according to different vehicle states. When the vehicle is in the ON position, the power management module and the vehicle control module jointly control the magnetic latching relay. When the vehicle is in the OFF position, the power management module periodically wakes up the magnetic latching relay through the wake-up unit and controls the magnetic latching relay independently, thereby achieving precise control of the magnetic latching relay according to the state of the low-voltage battery.

[0049] Figure 6 This is a schematic diagram of a vehicle structure provided by an embodiment of the present invention, such as... Figure 6 As shown, vehicle 600 includes a power management system 100.

[0050] In this embodiment, the power management system is applied to the vehicle. The power management module in the power management system can control the magnetic latching relay according to the state of the low-voltage battery. The magnetic latching relay is connected between the low-voltage battery and the electrical equipment, or between the low-voltage battery and the controller. The power management module controls the magnetic latching relay to turn on or off, thereby realizing the connection or disconnection between the low-voltage battery and the electrical equipment, or between the low-voltage battery and the controller. This ensures that the low-voltage battery has sufficient operating power and avoids the low-voltage battery from being depleted due to a large static current caused by the large number of controllers in the vehicle, or from being depleted due to static current when the vehicle is powered off.

[0051] Figure 7 This is a flowchart of a power management method provided in an embodiment of the present invention, such as... Figure 7 As shown, the method includes:

[0052] S710, when the key switch is closed, the power management module judges the parameters of the low-voltage battery collected by the signal acquisition module. When the power management module determines that the parameters of the low-voltage battery meet the first preset condition, the power management module controls the magnetic latching relay to turn on; when the power management module determines that the parameters of the low-voltage battery do not meet the first preset condition, the power management module controls the magnetic latching relay to turn off.

[0053] Optionally, the first preset conditions include that the low-voltage battery charge is not lower than a first threshold, the low-voltage battery terminal voltage is not lower than a second threshold, the low-voltage battery cell voltage is not greater than a third threshold, the cell temperature is within a preset range, and there are no other safety faults.

[0054] S720. When the key switch is closed and the key switch or the charging gun is active, when the vehicle control module is activated and sends a control signal to turn off the magnetic latching relay, the vehicle control module controls the magnetic latching relay to turn off through the power management module. When the vehicle control module is not activated, the power management module controls the magnetic latching relay to turn on.

[0055] S730. When the key switch is closed, the redundant switch is closed and held for a preset time. When the key switch and the charging gun are invalid, the power management module controls the magnetic latching relay to turn off. When the key switch or the charging gun is valid, if the vehicle control module is activated and sends a control signal to turn off the magnetic latching relay, the vehicle control module controls the magnetic latching relay to turn off through the power management module. If the vehicle control module is not activated, the power management module controls the magnetic latching relay to turn on.

[0056] S740, when the key switch is turned off, the wake-up unit periodically wakes up the power management module according to the characteristics of the low-voltage battery. When the power management module is woken up, it judges the parameters of the low-voltage battery collected by the signal acquisition module. When the power management module determines that the parameters of the low-voltage battery meet the first preset condition, it controls the magnetic latching relay to turn on; when the power management module determines that the parameters of the low-voltage battery do not meet the first preset condition, it controls the magnetic latching relay to turn off.

[0057] This embodiment provides a power management method that can be executed by the power management system described in the above embodiment. The power management module in the power management system can control a magnetic latching relay based on the state of the low-voltage battery. When the power management module determines that the low-voltage battery meets the operating conditions based on its parameters, it controls the magnetic latching relay to turn on. When the power management module determines that the low-voltage battery does not meet the operating conditions based on its parameters, it controls the magnetic latching relay to turn off, ensuring that the low-voltage battery has sufficient power and avoiding operation with a low voltage, thus solving the problem of low-voltage battery depletion.

[0058] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0059] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A power management system for a new energy vehicle, characterized in that, include: Signal acquisition module, power management module, magnetic latching relay and redundant switch; The signal acquisition module is connected to the low-voltage battery and is used to acquire the parameters of the low-voltage battery. The output terminal of the signal acquisition module is connected to the input terminal of the power management module, and the output terminal of the power management module is connected to the magnetic latching relay. The power management module is used to receive the parameters of the low-voltage battery acquired by the signal acquisition module and to control the magnetic latching relay to be turned on or off through the control signal output from the output terminal. The power management module is also connected to the redundant switch and is used to control the magnetic latching relay to be turned on or off according to the on or off state of the redundant switch. The magnetic latching relay is connected between the low-voltage battery and the electrical device. When the magnetic latching relay is turned on, the electrical device is connected to the low-voltage battery, and the low-voltage battery provides power to the electrical device. When the magnetic latching relay is turned off, the electrical device is disconnected from the low-voltage battery, and the low-voltage battery does not provide power to the electrical device. It also includes a vehicle control module, which is activated by a key switch or a charging gun. The vehicle control module is connected to the power management module. After the vehicle control module is activated, it is used to control the control signal output by the power management module to control the magnetic latching relay to turn on or off. The power management module includes a wake-up unit, which is used to periodically wake up the power management module according to the characteristics of the low-voltage battery.

2. The power management system for new energy vehicles according to claim 1, characterized in that, When the key switch is closed, the power management module judges the parameters of the low-voltage battery collected by the signal acquisition module. When the power management module determines that the parameters of the low-voltage battery meet the first preset condition, the power management module controls the magnetic latching relay to turn on; when the power management module determines that the parameters of the low-voltage battery do not meet the first preset condition, the power management module controls the magnetic latching relay to turn off.

3. The power management system for new energy vehicles according to claim 2, characterized in that, The first preset conditions include that the low-voltage battery charge is not lower than the first threshold, the low-voltage battery terminal voltage is not lower than the second threshold, the low-voltage battery cell voltage is not greater than the third threshold, the cell temperature is within the preset range, and there are no other safety faults.

4. The power management system for new energy vehicles according to claim 1, characterized in that, When the key switch is closed and the key switch or the charging gun is active, when the vehicle control module is activated and sends a control signal to turn off the magnetic latching relay, the vehicle control module controls the magnetic latching relay to turn off through the power management module. When the vehicle control module is not activated, the power management module controls the magnetic latching relay to turn on.

5. The power management system for new energy vehicles according to claim 1, characterized in that, When the key switch is closed, the redundant switch is closed and held for a preset time. When the key switch and the charging gun are invalid, the power management module controls the magnetic latching relay to turn off. When the key switch or the charging gun is valid, if the vehicle control module is activated and sends a control signal to turn off the magnetic latching relay, the vehicle control module controls the magnetic latching relay to turn off through the power management module. If the vehicle control module is not activated, the power management module controls the magnetic latching relay to turn on.

6. The power management system for new energy vehicles according to claim 1, characterized in that, When the key switch is turned off, the wake-up unit periodically wakes up the power management module based on the characteristics of the low-voltage battery. When the power management module is woken up, it judges the parameters of the low-voltage battery collected by the signal acquisition module. When the power management module determines that the parameters of the low-voltage battery meet the first preset condition, it controls the magnetic latching relay to turn on; when the power management module determines that the parameters of the low-voltage battery do not meet the first preset condition, it controls the magnetic latching relay to turn off.

7. A vehicle, characterized in that, Includes the power management system described in any one of claims 1-6.

8. A power management method, executed by the power management system according to any one of claims 1-6, the method comprising: When the key switch is closed, the power management module judges the parameters of the low-voltage battery collected by the signal acquisition module. When the power management module determines that the parameters of the low-voltage battery meet the first preset condition, the power management module controls the magnetic latching relay to turn on; when the power management module determines that the parameters of the low-voltage battery do not meet the first preset condition, the power management module controls the magnetic latching relay to turn off. When the key switch is closed and the key switch or the charging gun is active, when the vehicle control module is activated and sends a control signal to turn off the magnetic latching relay, the vehicle control module controls the magnetic latching relay to turn off through the power management module. When the vehicle control module is not activated, the power management module controls the magnetic latching relay to turn on. When the key switch is closed, the redundant switch is closed and held for a preset time. When the key switch and the charging gun are invalid, the power management module controls the magnetic latching relay to turn off. When the key switch or the charging gun is valid, if the vehicle control module is activated and sends a control signal to turn off the magnetic latching relay, the vehicle control module controls the magnetic latching relay to turn off through the power management module. If the vehicle control module is not activated, the power management module controls the magnetic latching relay to turn on. When the key switch is turned off, the wake-up unit periodically wakes up the power management module based on the characteristics of the low-voltage battery. When the power management module is woken up, it judges the parameters of the low-voltage battery collected by the signal acquisition module. When the power management module determines that the parameters of the low-voltage battery meet the first preset condition, it controls the magnetic latching relay to turn on; when the power management module determines that the parameters of the low-voltage battery do not meet the first preset condition, it controls the magnetic latching relay to turn off.

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