Battery charging method, system and vehicle

Abstract

The embodiment of the present application discloses a battery charging method, system and vehicle, which relates to the field of battery technology. The method includes: the power accumulation calculation module detects the output current and output voltage of the battery to be charged, and determines whether the battery to be charged is in a low-power state according to the output current and output voltage of the battery to be charged; when the battery to be charged is in a low-power state, the battery manager controls the DC relay to be attracted through a separate path to make the voltage conversion circuit including the power battery, the DC relay and the voltage converter conductive; when the DC relay is attracted, the voltage converter converts the first voltage output by the power battery into a second voltage to charge the battery to be charged, wherein the first voltage is greater than the second voltage. According to the above method, when charging the battery to be charged, energy consumption can be reduced, and the problem of high energy consumption when charging the battery can be alleviated.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery charging method, system and vehicle. Background Art

[0002] With the advancement of battery power supply technology, batteries are currently widely used in industries such as electric vehicles and substations. In such industries, the power supply system used for power supply usually includes a power battery with a higher output voltage and a storage battery with a lower output voltage. Taking the power supply system in an electric vehicle as an example, after the power supply system has been working for a period of time, the power battery in the electric vehicle can replenish the battery, allowing the battery to be used for a longer time and providing the necessary power support for driving.

[0003] Traditional battery recharging methods include a method of regularly recharging the battery and a method of triggering recharging when the battery voltage is detected to be lower than a threshold value. If the scheduled recharging method is used to recharge the battery, the battery may be in a low-power state for a long time. If the battery is in a low-power state for a long time, chemical reactions may occur in the battery electrodes, thereby causing blockage of the internal ion channels during battery charging, reducing the charging performance of the battery, making it difficult to fully charge, and shortening the battery life, thereby causing a large waste of energy. If a method of triggering recharging when the battery voltage is detected to be lower than a threshold value is used, there is also a problem of energy waste. Therefore, the battery recharging method in the prior art has the problem of high energy consumption. Summary of the invention

[0004] The present application proposes a battery charging method, system and vehicle, which can alleviate the problem of high energy consumption during battery charging.

[0005] In a first aspect, an embodiment of the present application provides a battery charging method, which is applied to a battery charging system, wherein the battery charging system includes a power accumulation calculation module, a voltage converter, a DC relay, a battery manager, and a power battery, and the method includes: the power accumulation calculation module detects the output current and output voltage of the battery to be charged, and determines whether the battery to be charged is in a low-power state based on the output current and output voltage of the battery to be charged; when the battery to be charged is in a low-power state, the battery manager controls the DC relay to be attracted through a separate path to make the voltage conversion circuit including the power battery, the DC relay, and the voltage converter conductive; when the DC relay is in the attracted state, the voltage converter converts the first voltage output by the power battery into a second voltage to charge the battery to be charged, wherein the first voltage is greater than the second voltage.

[0006] In a second aspect, the embodiment of the present application further provides a battery charging system, which includes: a power battery, a power accumulation calculation module, a voltage converter, a DC relay, and a battery manager. The power battery is used to provide a first voltage; the power accumulation calculation module is connected to the battery to be charged, and is used to detect the output current and output voltage of the battery to be charged, and determine whether the battery to be charged is in a power-deficient state according to the output current and output voltage of the battery to be charged; the voltage converter is connected to the battery to be charged and the power battery respectively, and is used to convert the first voltage output by the power battery into a second voltage, wherein the first voltage is greater than the second voltage; the DC relay is connected between the battery to be charged and the power battery through a separate path; and the battery manager is connected to the DC relay, the voltage converter, and the power accumulation calculation module respectively, and is used to control the DC relay to be attracted through a separate path when the battery to be charged is in a power-deficient state, so that the voltage conversion circuit including the power battery, the DC relay, and the voltage converter is turned on, and the voltage converter converts the first voltage output by the power battery into the second voltage to charge the battery to be charged.

[0007] In a third aspect, an embodiment of the present application further provides a vehicle, which includes a vehicle body and the above-mentioned battery charging system.

[0008] The method provided by the present application includes: in a battery charging system including a power accumulation calculation module, a voltage converter, a DC relay, a battery manager and a power battery, the power accumulation calculation module detects the output current and output voltage of the battery to be charged, and determines whether the battery to be charged is in a low-power state according to the output current and output voltage of the battery to be charged. If the battery to be charged is in a low-power state, the battery manager controls the DC relay to be attracted through a separate path to make the voltage conversion circuit including the power battery, the DC relay and the voltage converter conductive, and the voltage converter converts the first voltage output by the power battery into a second voltage to charge the battery to be charged, wherein the first voltage is greater than the second voltage. When the battery to be charged is in a low-power state, the battery manager is enabled to control the entire charging process. In this process, the battery manager, the DC relay and the voltage converter are started and operated only when charging is needed. Therefore, during the charging process, only the energy required for the normal operation of each device in the above-mentioned battery charging system is consumed, thereby reducing the energy consumed when charging the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0010] Figure 1 A schematic diagram of a process of a battery charging method provided in an embodiment of the present application is shown;

[0011] Figure 2 A schematic diagram of a process of a battery charging method provided in another embodiment of the present application is shown;

[0012] Figure 3 A schematic diagram of a process of a battery charging method provided by another embodiment of the present application is shown;

[0013] Figure 4 A structural block diagram of a battery charging system in which a DC relay is connected between a power battery and a voltage converter through a separate path is shown in another embodiment of the present application;

[0014] Figure 5 A structural block diagram of a battery charging system provided by another embodiment of the present application is shown, in which a DC relay is connected between a battery to be charged and a voltage converter through a separate path;

[0015] Figure 6 A structural block diagram of a battery charging system including a high-voltage relay and a low-voltage relay provided in another embodiment of the present application is shown;

[0016] Figure 7 A schematic diagram of a vehicle provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0017] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0018] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] Below, the technical terms involved in this application are first introduced.

[0020] Electric vehicle, electric vehicle refers to a vehicle that uses an on-board power supply as power, drives the wheels with an electric motor, and complies with various requirements of road traffic, safety regulations, etc. Electric vehicles can include pure electric vehicles, hybrid electric vehicles, and fuel cell vehicles. Electric vehicles are composed of mechanical systems such as electric drive systems, control systems, and drive force transmission systems, as well as working devices that realize other functions. The electric drive and control system is the core of electric vehicles and the biggest difference between electric vehicles and traditional internal combustion engine vehicles. The electric drive and control system consists of a drive motor, a power supply, and a speed control device for the motor. Other devices of electric vehicles are basically the same as those of internal combustion engine vehicles. The power supply can provide electrical energy for the drive motor of the electric vehicle, and the motor can convert the electrical energy of the power supply into mechanical energy, thereby driving the wheels and other working devices directly or through a transmission device. Electric vehicles can include two types of batteries, one is a power battery, which can be used to provide a first voltage for the engine of the whole vehicle, and the other is a low-voltage battery, which can be used to provide a second voltage for the electrical equipment of the whole vehicle, such as the central control and indicator lights, wherein the first voltage is greater than the second voltage.

[0021] Power battery, a power battery is a power source that provides power for equipment. The power battery mentioned in this application can be a power source that provides driving power energy for electric vehicles, with high capacity and output power. The power battery has a relatively complete management system, which can detect the health status of the power battery and manage the charging and discharging of the power battery through its management system, thereby ensuring the normal operation of the power battery.

[0022] The battery to be recharged mentioned in the present application may be a battery that provides a second voltage working power supply for the working device of the electric vehicle. The battery to be recharged may be charged by converting the first voltage output by the power battery into the second voltage through a voltage converter, wherein the first voltage is greater than the second voltage.

[0023] With the advancement of electric vehicle technology, the functions of electric vehicles are becoming more and more complex, resulting in an increase in vehicle electronic control units and electrical equipment. The power supply of an electric vehicle generally includes a power supply capable of outputting a first voltage and a low-voltage battery capable of outputting a second voltage, wherein the first voltage is greater than the second voltage. The battery replenishment method generally uses a voltage converter to convert the first voltage output by the power battery into a second voltage to replenish the battery to be replenished, including a method for regularly replenishing the battery to be replenished, and a method for triggering replenishment when the voltage of the battery to be replenished is detected to be lower than a threshold. When replenishing the battery to be replenished, it is necessary to enable the vehicle controller VCU and other controllers to control the voltage converter to convert the first voltage output by the power battery into a second voltage and replenish the battery to be replenished, which consumes a lot of energy. Therefore, the traditional battery replenishment method has the problem of high energy consumption.

[0024] Therefore, in order to alleviate the above-mentioned defects, an embodiment of the present application provides a battery charging method, which is applied to a battery charging system, wherein the battery charging system includes a power accumulation calculation module, a voltage converter, a DC relay, a battery manager and a power battery. The method includes: in the battery charging system including the power accumulation calculation module, the voltage converter, the DC relay, the battery manager and the power battery, the power accumulation calculation module detects the output current and output voltage of the battery to be charged, and determines whether the battery to be charged is in a low-power state according to the output current and output voltage of the battery to be charged. If the battery to be charged is in a low-power state, the battery manager controls the DC relay to be attracted through a separate path to turn on the voltage conversion circuit including the power battery, the DC relay and the voltage converter, and the voltage converter converts the first voltage output by the power battery into a second voltage to charge the battery to be charged, wherein the first voltage is greater than the second voltage.

[0025] By enabling the battery manager to control the entire charging process when the battery to be charged is in a low-power state, only the energy required by the above-mentioned battery charging system is consumed. Therefore, the method provided in this application can reduce the energy consumed during battery charging and alleviate the problem of high energy consumption during battery charging.

[0026] The following is an introduction to the battery charging method involved in this application.

[0027] Please refer to Figure 1 , Figure 1 A schematic flow chart of a battery charging method provided in an embodiment of the present application. The battery charging method may include the following steps:

[0028] Step S110: the power accumulation calculation module detects the output current and output voltage of the battery to be charged, and determines whether the battery to be charged is in a power-deficient state according to the output current and output voltage of the battery to be charged.

[0029] In an embodiment of the present application, the power accumulation calculation module can be a sensor for detecting the operating parameters of the battery such as the current, voltage and charge amount. Specifically, the power accumulation calculation module can be an EBS sensor (Electronic Battery Sensor) or other sensors in a DCDC (Direct current-Direct current) converter. The EBS sensor can be used to detect the current flowing into or out of the battery and perform cumulative calculations. It can also be used to detect the voltage of the battery, thereby obtaining the charge of the battery according to the current flowing into or out of the battery and the voltage of the battery. The DCDC converter is a voltage converter that effectively outputs a fixed voltage after converting the input voltage. The DCDC converter is divided into three categories: a boost DCDC converter, a buck DCDC converter and a buck-boost DCDC converter. The boost DCDC converter can be used to convert a low voltage into a high voltage, and the buck DCDC converter can be used to convert a high voltage into a low voltage.

[0030] The battery to be charged can be discharged by providing power to the working device of the vehicle and discharging during driving, or by discharging the battery to be charged due to static power consumption generated by the vehicle being parked or not used for a long time. The output current and output voltage of the battery to be charged are respectively the current and voltage of the battery to be charged during the discharge process.

[0031] The battery to be charged is in a low-power state, which means that the battery to be charged is insufficient. When the battery to be charged is in a low-power state, a load using the battery to be charged as a power source cannot obtain a rated voltage for normal operation.

[0032] In an exemplary embodiment, the above step S110 includes the following sub-steps:

[0033] Sub-step S111: obtaining the output charge of the battery to be recharged according to the output current and output voltage of the battery to be recharged, and determining whether the output charge of the battery to be recharged is not less than a first preset threshold value; if the output charge of the battery to be recharged is not less than the first preset threshold value, the battery to be recharged is in a low-power state; if the output charge of the battery to be recharged is less than the first preset threshold value, the battery to be recharged is not in a low-power state.

[0034] In an embodiment of the present application, the output charge of the battery to be recharged is obtained based on the output current and output voltage of the battery to be recharged. The method may be as follows: during the discharge of the battery to be recharged, the power accumulation calculation module may continuously detect the output current of the battery to be recharged at a fixed frequency, as well as the output voltage of the battery to be recharged at each detection, and perform accumulation calculation to obtain the output charge of the battery to be recharged.

[0035] The first preset threshold may be a battery charge threshold that is set by default before a user uses a vehicle including the battery charging system. Specifically, the first preset threshold may be 50%, 60% or 70% of the charge of a fully charged battery.

[0036] As an optional implementation, if the charge of the battery to be recharged is 40Ah when fully charged, the first preset threshold value can be 24Ah. If the charge output by the battery to be recharged during the discharge process is greater than or equal to 24Ah, the battery to be recharged is in a low-power state; if it is less than 24Ah, it is not in a low-power state.

[0037] Step S120: When the battery to be charged is in a low-power state, the battery manager controls the DC relay to be attracted through a separate path to turn on the voltage conversion circuit including the power battery, the DC relay and the voltage converter.

[0038] In an embodiment of the present application, a DC relay may be an electrical appliance that causes a predetermined step change in a controlled quantity in an electrical output circuit when a change in the input quantity of a first voltage circuit reaches a specified requirement. A DC relay may be composed of an iron core, a coil, an armature, and a contact spring. When a DC relay is used to control a circuit, the coil of the DC relay may be energized so that the coil generates an electromagnetic effect through current, so that the armature overcomes the spring tension under the attraction of the electromagnetic force and approaches the iron core, thereby driving the moving contact and the static contact of the armature to close. When the coil is powered off, the electromagnetic force disappears, and the armature returns to its original position under the reaction force of the spring, releasing the moving contact and the static contact. By closing and releasing the DC relay, the circuit in which the DC relay is located can be turned on and off.

[0039] In the embodiment of the present application, the voltage converter may be a DCDC converter, which may be used to convert a first voltage output by the power battery into a second voltage that is smaller than the first voltage.

[0040] In the embodiment of the present application, the battery manager can be a BMS (Battery Management System) battery manager or a DCDC converter. The BMS battery manager can be used to perform online detection and real-time monitoring of the vehicle battery, provide the vehicle with information such as power battery voltage, current, temperature and insulation status, and judge the battery operation status and battery pack discreteness in real time. If a fault occurs, a fault signal is sent to the vehicle's central control or electronic equipment associated with the vehicle in a timely manner and an alarm is issued.

[0041] As an optional implementation, the battery manager is a BMS battery manager. The BMS battery manager can directly control the DC relay to be attracted / released through a separate path through a CAN (Controller Area Network) communication line connected between the BMS battery manager and the DC relay, so that the communication link in the battery charging process is shorter, the charging process is faster, and less energy is consumed. Among them, CAN is a serial communication protocol certified by the International Organization for Standardization, and the CAN communication line can be used for communication between the BMS battery manager and the DC relay.

[0042] The voltage conversion circuit may specifically be composed of a power battery, a DC relay and a voltage converter connected in series. When the DC relay is in an energized state, the voltage conversion circuit is turned on, and the power battery may transmit a first voltage to the voltage converter.

[0043] Step S130: When the DC relay is in the energized state, the voltage converter converts the first voltage output by the power battery into a second voltage to charge the battery to be charged, wherein the first voltage is greater than the second voltage.

[0044] As an optional implementation, when the above method is applied to a car, the battery to be charged can be a low-voltage battery, which can be used to provide a 13V voltage for the vehicle's lighting and other working devices, and the second voltage can be 13V. The power battery can be a high-voltage battery, which can be used to provide a 380V voltage for equipment such as a drive system, and the first voltage can be 380V. The low-voltage battery charging power supply can be provided by the power battery, but since the power battery provides 380V and the low-voltage battery requires a voltage of 13V to 14V, a voltage converter is required to convert the 380V voltage output by the power battery into a 14V voltage to power the low-voltage battery.

[0045] It should be understood that when the above method is applied to different devices, the voltage values ​​of the first voltage and the second voltage can be set according to actual needs, which will not be described in detail here.

[0046] As an optional implementation, considering that the power battery may be insufficient in power or fail to meet the power supply conditions, in order to maintain the battery performance of the power battery, before executing step S120, the method further includes:

[0047] The power accumulation calculation module detects the output current and output voltage of the power battery, and determines whether the power battery meets the power supply condition according to the output current and output voltage of the power battery.

[0048] Step S120 may also be: when the storage battery to be charged is in a low-power state and the power battery meets the power supply condition, the battery manager controls the DC relay to be attracted through a separate path.

[0049] In this embodiment, the power accumulation calculation module may include a first sensor, which can be used to detect the input current, input voltage, output current and output voltage of the battery to be recharged. The power accumulation calculation module may also include a second sensor, which can be used to detect the output current and output voltage of the power battery. When the power accumulation calculation module includes the first sensor, the first sensor is connected to the battery to be recharged, that is, the power accumulation calculation module is connected to the battery to be recharged; when the power accumulation calculation module includes the second sensor, the second sensor is connected to the power battery, that is, the power accumulation calculation module is connected to the power battery. As an optional embodiment, the power accumulation calculation module includes the first sensor and the second sensor, and accordingly, the power accumulation calculation module is connected to the battery to be recharged and the power battery respectively.

[0050] The power battery meeting the power supply condition may mean that the remaining power of the power battery is sufficient. The remaining power of the power battery is sufficient may mean that the remaining power of the power battery is sufficient to maintain the operation of the entire vehicle for a predetermined time, so that the user can charge the power battery within the predetermined time.

[0051] The power battery meeting the power supply conditions may also mean that the power battery is in a healthy state. The power battery being in a healthy state may mean that the operating parameters of the power battery, such as the voltage, current, and battery temperature, are within a normal range that will not damage the power battery.

[0052] In this implementation manner, determining whether the power battery meets the power supply condition is performed based on the output current and output voltage of the power battery. The method may be as follows: obtaining the output charge of the power battery based on the output current and output voltage of the power battery, and determining whether the output charge of the power battery is less than a second preset threshold value; if the output charge of the power battery is less than the second preset threshold value, the power battery meets the power supply condition; if the output charge of the power battery is not less than the second preset threshold value, the power battery does not meet the power supply condition.

[0053] As an implementation mode, the output charge of the power battery is obtained according to the output current and output voltage of the power battery. The method may be as follows: during the discharge of the power battery, the power accumulation calculation module may continuously detect the output current of the power battery at a fixed frequency, as well as the output voltage of the power battery during each detection, and perform accumulation calculation to obtain the output charge of the power battery.

[0054] As another implementation, the output charge of the power battery is obtained based on the output current and output voltage of the power battery. Alternatively, the power accumulation calculation module obtains the remaining charge of the power battery by monitoring the voltage of the power battery, and then obtains the output charge of the power battery by the charge of the power battery when it is fully charged and the remaining charge.

[0055] In an embodiment of the present application, the second preset threshold may be the power battery charge threshold that is set by default for the vehicle before the user uses the vehicle including the battery charging system. Specifically, the second preset threshold may be 50%, 60% or 70% of the charge when the power battery is fully charged.

[0056] As an optional implementation, if the charge of the power battery when fully charged is 180Ah, the second preset threshold may be 108Ah. If the charge output by the power battery during discharge is less than 108Ah, the power battery meets the power supply condition; if it is greater than or equal to 108Ah, the power supply condition is not met.

[0057] This embodiment provides a battery charging method, in which when the power accumulation calculation module detects that the battery to be charged is in a low-power state, the battery manager controls the DC relay to be attracted through a separate path to turn on the voltage conversion circuit including the power battery, the DC relay and the voltage converter, and the voltage converter converts the first voltage output by the power battery into a second voltage to charge the battery to be charged. During the above charging process, only the energy required by the above battery charging system is consumed, and there is no need to consume the energy required to enable the vehicle controller VCU and other controllers in the traditional battery charging method. Therefore, the method provided by this application can reduce the energy consumed when the battery is charged, and alleviate the problem of high energy consumption when the battery is charged.

[0058] Please refer to Figure 2 , Figure 2 A flowchart of a battery charging method provided in another embodiment of the present application. The battery charging method may include the following steps:

[0059] Step S210: the power accumulation calculation module detects the output current and output voltage of the battery to be charged, and determines whether the battery to be charged is in a power-deficient state according to the output current and output voltage of the battery to be charged.

[0060] Step S220: When the battery to be charged is in a low-power state, the battery manager controls the DC relay to be attracted through a separate path to turn on the voltage conversion circuit including the power battery, the DC relay and the voltage converter.

[0061] Step S230: When the DC relay is in the energized state, the voltage converter converts the first voltage output by the power battery into a second voltage to charge the battery to be charged, wherein the first voltage is greater than the second voltage.

[0062] Step S240: the power accumulation calculation module detects the input current and input voltage of the battery to be charged, and determines whether the battery to be charged meets the charging stop condition according to the input current and input voltage of the battery to be charged.

[0063] In the embodiment of the present application, determining whether the battery to be charged meets the condition for stopping charging according to the input current and input voltage of the battery to be charged may be: after charging the battery to be charged by the power supply and the voltage converter, determining whether the sum of the charged power and the remaining power reaches the range of sufficient power of the battery to be charged. If the range of sufficient power of the battery to be charged is reached, the battery to be charged is sufficiently charged and meets the condition for stopping charging. If the range of sufficient power of the battery to be charged is not reached, the battery to be charged is not sufficiently charged and does not meet the condition for stopping charging.

[0064] In an exemplary embodiment, the above step S240 includes the following sub-steps:

[0065] Sub-step S241: obtaining the input charge of the battery to be recharged according to the input current and input voltage of the battery to be recharged, and determining whether the input charge of the battery to be recharged is not less than the output charge of the battery to be recharged; if the input charge of the battery to be recharged is not less than the output charge of the battery to be recharged, the battery to be recharged meets the condition for stopping recharging; if the input charge of the battery to be recharged is less than the output charge of the battery to be recharged, the battery to be recharged does not meet the condition for stopping recharging.

[0066] In an embodiment of the present application, the input charge of the battery to be charged is obtained based on the input current and input voltage of the battery to be charged, which can be: during the charging process of the battery to be charged, the power accumulation calculation module can continuously detect the input current of the battery to be charged at a fixed frequency, as well as the input voltage of the battery to be charged at each detection, and perform accumulation calculation to obtain the input charge of the battery to be charged.

[0067] The condition for stopping charging may refer to that the charging amount of the battery to be charged is equal to the discharge amount, that is, the battery to be charged is fully charged. If the input charge amount of the battery to be charged is less than the output charge amount of the battery to be charged, then the charging amount of the battery to be charged is less than the discharge amount, and it is not fully charged, and the condition for stopping charging is not met. If the input charge amount of the battery to be charged is equal to the output charge amount of the battery to be charged, then the charging amount of the battery to be charged is equal to the discharge amount, and at this time the battery to be charged is fully charged, and the condition for stopping charging is met.

[0068] As an optional implementation, if the charge of the battery to be recharged is 40Ah when fully charged and the discharged charge is 24Ah, if the charge input into the battery to be recharged during the recharging process is equal to 24Ah, then the battery to be recharged meets the condition for stopping recharging; if it is less than 24Ah, then the condition for stopping recharging is not met.

[0069] Step S250: When the storage battery to be charged meets the condition for stopping charging, the battery manager controls the DC relay to be released through a separate path so that the power battery stops charging the storage battery to be charged.

[0070] In the embodiment of the present application, the battery manager controls the release of the DC relay through a separate path, so that the circuit where the DC relay is located can be disconnected. The circuit where the DC relay is located can refer to a voltage conversion circuit composed of a power battery, a DC relay and a voltage converter in series. When the DC relay is released, the series circuit is disconnected, and the power battery stops transmitting the first voltage to the voltage converter, thereby stopping charging the battery to be charged.

[0071] This embodiment provides another battery charging method, in which the power accumulation calculation module detects the input current and input voltage of the battery to be charged during the charging process, and determines whether the battery to be charged meets the condition for stopping charging according to the input current and input voltage of the battery to be charged. When the battery to be charged meets the condition for stopping charging, the battery manager controls the release of the DC relay through a separate path to stop charging the battery to be charged.

[0072] When the charged capacity of the battery to be charged is equal to the discharged capacity, that is, when the battery to be charged is fully charged, the battery manager controls the release of the DC relay through a separate path to disconnect the voltage conversion circuit for charging the battery to be charged, thereby avoiding continuous charging after the battery to be charged is fully charged, thereby saving energy after the battery to be charged is fully charged. Therefore, the method provided in the present application can reduce the energy consumed when charging the battery and alleviate the problem of high energy consumption when charging the battery.

[0073] Please refer to Figure 3 , Figure 3A flowchart of a battery charging method applicable to a vehicle is provided for another embodiment of the present application. The battery charging method provided by the present application can be used in the normal use of the vehicle or in the dormant state of the vehicle. The battery charging method may include the following steps:

[0074] Step S310: the power accumulation calculation module detects the output current and output voltage of the battery to be charged, and determines whether the battery to be charged is in a power-deficient state according to the output current and output voltage of the battery to be charged.

[0075] As an optional implementation, the above step S310 can be performed when the vehicle is in a dormant state. Specifically, the vehicle dormant state may refer to that after the vehicle is locked and powered off, each device in the vehicle enters a low power consumption state to avoid a static high power consumption state. When the vehicle is in a dormant state, the battery charging system in the vehicle only maintains a simple battery detection function, and other high-power consumption loads in the vehicle are in an off state. The vehicle user can wake up the dormant vehicle by unlocking the door with the vehicle key, or by unlocking the door by long-distance 4G unlocking, Bluetooth unlocking, etc., or by waking up the entire vehicle without unlocking the door, and only waking up the devices in the battery charging system in the vehicle.

[0076] In an embodiment of the present application, the battery manager can detect whether the vehicle is locked and powered off. If the vehicle is locked and powered off, the battery manager can send a power-off sleep command to the voltage converter in the battery charging system to put the voltage conversion device into a sleep state. The battery manager can also control the release of the relay. At the same time, the battery manager can also enter the sleep state within a preset time after the vehicle is locked and powered off. However, it should be noted that in an embodiment of the present application, when the vehicle is in a sleep state, the power accumulation calculation module can maintain a simple battery detection function.

[0077] Specifically, since the static power consumption of the vehicle in the dormant state is relatively stable, the power accumulation calculation module can continuously detect the output current of the battery to be charged and the power battery at a fixed frequency; the power accumulation calculation module can also reduce the sampling rate in the process of detecting the output voltage of the battery to be charged and the power battery to save energy.

[0078] In an exemplary embodiment, if the battery to be recharged is not in a low-power state, the vehicle continues to remain in a dormant state, and the battery recharging system in the vehicle continues to maintain a simple battery detection function.

[0079] Step S320: When the power accumulation calculation module determines that the battery to be charged is in a low-power state, the power accumulation calculation module sends a first wake-up instruction to the battery manager to wake up the battery manager.

[0080] When the power accumulation calculation module determines that the battery to be charged is in a low-power state, the vehicle is still in a dormant state, and the battery manager, voltage converter and other equipment have not yet been awakened and started working. Therefore, the power accumulation calculation module sends a first wake-up instruction to the battery manager, wherein the first wake-up instruction is used to wake up the battery manager and start working.

[0081] In the embodiment of the present application, the power accumulation calculation module does not need to send instructions to the vehicle controller VCU, and then the vehicle controller wakes up the battery manager. Instead, it can send a first wake-up instruction to the battery manager through the LIN (Local Interconnect Network) communication line connected between the power accumulation calculation module and the battery manager to directly wake up the battery manager, so that the communication link in the battery charging process is shorter, the charging process is faster, and there is no need to use the vehicle controller, consuming less energy. Among them, LIN is a low-cost serial communication protocol based on UART (Universal Asynchronous Receiver / Transmitter) / SCI (Serial Communication Interface), and the LIN communication line can be used for communication between the power accumulation calculation module and the battery manager.

[0082] As an optional implementation, when the power accumulation calculation module determines that the battery to be charged is in a low-power state, the power accumulation calculation module can increase the sampling rate to make the detection of the input charge of the battery to be charged more accurate during the charging process.

[0083] Step S330: the power accumulation calculation module sends a charging instruction to the battery manager, so that the battery manager confirms that the battery to be charged is in a low-power state when receiving the charging instruction.

[0084] As an implementation mode, the power accumulation calculation module sends a power replenishment instruction to the battery manager, which may be: after the power accumulation calculation module sends a first wake-up instruction to the battery manager and wakes up the battery manager, the power accumulation calculation module then sends a power replenishment instruction to the battery manager via a LIN communication line connected between the power accumulation calculation module and the battery manager, wherein the power replenishment instruction is used to enable the battery manager to confirm that the battery to be replenished is in a low-power state, and start to execute the power replenishment operation for the battery to be replenished.

[0085] As another implementation, the power accumulation calculation module sends a power replenishment instruction to the battery manager, which may be: while sending the first wake-up instruction to the battery manager, the power accumulation calculation module sends a power replenishment instruction to the battery manager through the LIN communication line connected between the power accumulation calculation module and the battery manager, wherein the power replenishment instruction is used to enable the battery manager to confirm that the battery to be replenished is in a low-power state, and start executing the power replenishment operation for the battery to be replenished.

[0086] Step S340: When the battery to be charged is in a low-power state, the battery manager controls the DC relay to be attracted through a separate path to turn on the voltage conversion circuit including the power battery, the DC relay and the voltage converter.

[0087] Step S350: When the storage battery to be charged is in a low-power state, the battery manager sends a second wake-up instruction to the voltage converter to wake up the voltage converter.

[0088] When the power accumulation calculation module determines that the battery to be charged is in a low-power state and wakes up the battery manager, the vehicle is still in a dormant state, and devices such as the voltage converter have not yet been awakened and started working. Therefore, the battery manager can send a second wake-up instruction to the voltage converter through the CAN communication line connected between the battery manager and the voltage converter, wherein the second wake-up instruction is used to wake up the voltage converter and start working.

[0089] In an embodiment of the present application, the step of the battery manager controlling the DC relay to be energized through a separate path can be executed simultaneously with the step of the battery manager sending a second wake-up instruction to the voltage converter, or can be executed before the step of the battery manager sending the second wake-up instruction to the voltage converter. The present application does not impose any restrictions on this.

[0090] Step S360: When the DC relay is in the energized state, the voltage converter converts the first voltage output by the power battery into a second voltage to charge the battery to be charged, wherein the first voltage is greater than the second voltage.

[0091] Step S370: the power accumulation calculation module detects the input current and input voltage of the battery to be charged, and determines whether the battery to be charged meets the charging stop condition according to the input current and input voltage of the battery to be charged.

[0092] In an exemplary embodiment, if the battery to be charged does not meet the conditions for stopping charging, the battery manager continues to control the DC relay to remain in a closed state through a separate path, and the voltage converter continues to convert the first voltage output by the power battery into a second voltage to charge the battery to be charged, wherein the first voltage is greater than the second voltage.

[0093] Step S380: When the power accumulation calculation module determines that the battery to be charged meets the stop charging condition, the power accumulation calculation module sends a stop charging instruction to the battery manager, so that the battery manager determines that the battery to be charged meets the stop charging condition when receiving the stop charging instruction.

[0094] In an embodiment of the present application, the method in which the power accumulation calculation module sends a stop power replenishment instruction to the battery manager may be: the power accumulation calculation module sends a stop power replenishment instruction to the battery manager via a LIN communication line connected between the power accumulation calculation module and the battery manager, wherein the stop power replenishment instruction is used to enable the battery manager to confirm that the battery to be replenished meets the stop power replenishment conditions, and start to execute the operation of stopping further power replenishment.

[0095] Step S390: When the battery manager determines that the battery to be charged satisfies the condition for stopping charging, the battery manager sends a sleep instruction to the voltage converter to put the voltage converter into a sleep state.

[0096] When the battery to be charged meets the conditions for stopping charging, the battery to be charged can no longer be charged, and the device awakened during the charging process of the battery to be charged can re-enter the sleep state. Therefore, the battery manager can send a sleep command to the voltage converter through the CAN communication line connected between the battery manager and the voltage converter, where the sleep command is used to put the voltage converter into the sleep state.

[0097] Step S3100: When the storage battery to be charged meets the condition for stopping charging, the battery manager controls the DC relay to be released through a separate path so that the power battery stops charging the storage battery to be charged.

[0098] In an embodiment of the present application, the step of the battery manager sending a sleep instruction to the voltage converter can be executed simultaneously with the step of the battery manager controlling the release of the DC relay through a separate channel, or can be executed before the step of the battery manager controlling the release of the DC relay through a separate channel. The present application does not impose any restrictions on this.

[0099] Step S3110: The battery manager enters a sleep state.

[0100] After the battery manager sends a sleep command to the voltage converter and controls the release of the DC relay through a separate path, or after the battery manager detects and confirms that the voltage converter has entered the sleep state and the DC relay is in the released state, the battery manager automatically enters the sleep state.

[0101] As an optional implementation, before the battery manager automatically enters a sleep state, the battery manager can send a power consumption reduction instruction to the power accumulation calculation module via a LIN communication line connected between the power accumulation calculation module and the battery manager, wherein the power consumption reduction instruction is used to cause the power accumulation calculation module to reduce the sampling rate to save energy.

[0102] As an optional implementation, since the power accumulation calculation module may have errors in detecting the output charge and input charge of the battery to be recharged, the battery to be recharged may be recharged for a preset time at every preset interval. For example, when the power accumulation calculation module confirms that the input charge of the battery to be recharged is equal to the output charge of the battery to be recharged, the recharge is stopped. However, due to the error of the power accumulation calculation module, the input charge of the battery to be recharged is actually less than the output charge of the battery to be recharged, and the battery to be recharged is not fully charged. Therefore, the battery to be recharged may be recharged for 4 hours every week to ensure that the battery to be recharged is actually fully charged, thereby improving the accuracy of the battery to be recharged. It should be understood that the battery to be recharged may also be recharged for a preset time after the vehicle has traveled a preset mileage, and this application does not limit this.

[0103] The present embodiment provides another battery charging method. When the vehicle is in a dormant state and the power accumulation calculation module determines that the battery to be charged is in a low-power state, the power accumulation calculation module wakes up the battery manager and sends a charging instruction to the battery manager, and then the battery manager wakes up the voltage converter; when the power accumulation calculation module determines that the battery to be charged meets the conditions for stopping charging, the power accumulation calculation module sends a stop charging instruction to the battery manager, and then the battery manager sends a dormancy instruction to the voltage converter, and then the battery manager enters a dormant state.

[0104] By waking up the equipment in the battery charging system only when the battery to be charged is in a low-power state, and making the awakened equipment re-enter a sleep state when the battery to be charged meets the conditions for stopping charging, it is avoided that the equipment in the battery charging system is woken up when the battery to be charged does not need to be charged, thereby saving energy during the time when the battery to be charged does not need to be charged. Therefore, the method provided in the present application can reduce the energy consumed when the battery is charged, and alleviate the problem of high energy consumption when the battery is charged.

[0105] Please refer to Figure 4 , Figure 4 The structural block diagram of a battery charging system provided in another embodiment of the present application is as follows: The battery charging system 100 comprises: a power battery 110 , a power accumulation calculation module 120 , a voltage converter 130 , a DC relay 140 and a battery manager 150 .

[0106] The battery charging system 100 can be used to execute the battery charging method in the above embodiment. For a detailed description of the steps of the battery charging system 100 executing the battery charging method in the above embodiment, please refer to the description of the battery charging method in the above embodiment, which will not be repeated in this embodiment.

[0107] The power battery 110 is used to provide a first voltage; the power accumulation calculation module 120 is connected to the battery to be charged, and is used to detect the output current and output voltage of the battery to be charged, and determine whether the battery to be charged is in a power-deficient state according to the output current and output voltage of the battery to be charged; the voltage converter 130 is connected to the battery to be charged and the power battery 110, respectively, and is used to convert the first voltage output by the power battery 110 into a second voltage, wherein the first voltage is greater than the second voltage; the DC relay 14 ... The path is connected between the battery to be recharged and the power battery 110; the battery manager 150 is respectively connected to the DC relay 140, the voltage converter 130 and the power accumulation calculation module 120, and is used to control the DC relay 140 to be attracted through a separate path when the battery to be recharged is in a power-deficient state, so that the voltage conversion circuit including the DC relay 140 and the voltage converter 130 is turned on, and the voltage converter 130 converts the first voltage output by the power battery 110 into a second voltage to recharge the battery to be recharged.

[0108] As an implementation method, the voltage converter 130 is connected to the battery to be charged, which can be: Figure 5 As shown, the voltage converter 130 is directly connected to the battery to be charged, so that the voltage converter 130 can input the second voltage to the battery to be charged.

[0109] As another implementation, the voltage converter 130 is connected to the battery to be charged, and can also be: Figure 4 As shown, the voltage converter 130 is connected to the power accumulation calculation module 120, and the power accumulation calculation module 120 is connected to the battery to be charged, so that the voltage converter 130 is connected to the battery to be charged, and the voltage converter 130 can input the second voltage to the battery to be charged.

[0110] As an implementation method, the voltage converter 130 is connected to the power battery 110 and can be: Figure 5 As shown, the voltage converter 130 is directly connected to the power battery 110, so that the voltage converter 130 can convert the first voltage output by the power battery 110 into a second voltage. In this embodiment, the DC relay 140 is connected between the voltage converter 130 and the battery to be charged through a separate path.

[0111] As another embodiment, the voltage converter 130 is connected to the power battery 110 and can also be: Figure 4 As shown, the voltage converter 130 is connected to the DC relay 140 through a separate path, and the DC relay 140 is connected to the power battery 110 through a separate path, so that the voltage converter 130 is connected to the power battery 110, and the voltage converter 130 can convert the first voltage output by the power battery 110 into a second voltage. In this embodiment, the DC relay 140 is connected between the voltage converter 130 and the power battery 110 through a separate path.

[0112] In the embodiment of the present application, the battery manager 150 is connected to the DC relay 140, the voltage converter 130 and the power accumulation calculation module 120 respectively, which can be: Figure 4 As shown, the battery manager 150 is connected to the DC relay 140 through a separate passage via a connecting line such as a wire; the battery manager 150 is connected to the CAN communication line 152, and the CAN communication line 152 is connected to the voltage converter 130, thereby connecting the battery manager 150 to the voltage converter 130; and the battery manager 150 is connected to the LIN communication line 151, and the LIN communication line 151 is connected to the power accumulation calculation module 120, thereby connecting the battery manager 150 to the power accumulation calculation module 120.

[0113] In an exemplary embodiment, if Figure 6 As shown, the power battery 110 and the battery manager 150 can also be connected to the high-voltage relay 160 respectively, wherein the high-voltage relay 160 can be connected to other high-voltage loads in the vehicle that need to use the power battery 110 as a power source, and is used to make the circuit including the power battery 110, the high-voltage relay 160 and other high-voltage loads conductive.

[0114] The battery charging system 100 in this exemplary embodiment can be used to execute the above-mentioned battery charging method. As an optional implementation, the above-mentioned battery charging method is used in the dormant state of the vehicle. When the battery to be charged is in a low-power state, the battery manager 150 only controls the DC relay 140 to be attracted through a separate path, and does not control the high-voltage relay 160 to be attracted, so that the high-voltage relay 160 is in a released state, and the circuits including the power battery 110, the high-voltage relay 160 and other high-voltage loads remain disconnected. By using the DC relay 140 to control the circuit where the voltage converter 130 is located, only the voltage converter 130 is enabled when charging the battery to be charged, avoiding enabling other high-voltage loads when the vehicle is dormant and other high-voltage loads are not needed, thereby saving energy consumption when charging the battery.

[0115] In an exemplary embodiment, if Figure 6As shown, the voltage converter 130 and the battery manager 150 can also be connected to the low-voltage relay 170 respectively, wherein the low-voltage relay 170 can be connected to other low-voltage loads in the vehicle that require low voltage, and is used to make the circuit including the voltage converter 130, the low-voltage relay 170 and other low-voltage loads conductive.

[0116] The battery charging system 100 in this exemplary embodiment can be used to execute the above-mentioned battery charging method. As an optional implementation, the above-mentioned battery charging method is used in the dormant state of the vehicle. When the battery to be charged is in a low-power state, the battery manager 150 only controls the DC relay 140 to be attracted through a separate path, and does not control the low-voltage relay 170 to be attracted, so that the low-voltage relay 170 is in a released state, and the circuits including the voltage converter 130, the low-voltage relay 170 and other low-voltage loads remain disconnected. By controlling the circuit where the battery to be charged is located separately, when charging the battery to be charged, it is avoided to enable other low-voltage loads when the vehicle is dormant and other low-voltage loads are not needed, thereby saving energy consumption when charging the battery.

[0117] The present embodiment provides a battery charging system 100, in which the power battery 110 is used to provide a first voltage, the power accumulation calculation module 120 is connected to the battery to be charged, the voltage converter 130 is connected to the battery to be charged and the power battery 110 respectively, the DC relay 140 is connected between the battery to be charged and the power battery 110 through a separate path, and the battery manager 150 is connected to the DC relay 140, the voltage converter 130 and the power accumulation calculation module 120 respectively.

[0118] When using the battery charging system 100 to charge the battery to be charged, the battery manager 150 is used to control other devices in the battery charging system 100, and there is no need to use the vehicle controller VCU and other controllers. Only the energy required by the various devices in the above-mentioned battery charging system 100 is consumed, and there is no need to consume the energy required to enable the vehicle controller VCU and other controllers in the traditional battery charging method. Therefore, the battery charging system 100 provided in the present application can reduce the energy consumed when charging the battery, and alleviate the problem of high energy consumption when charging the battery.

[0119] Please refer to Figure 7 , Figure 7 A schematic diagram of a vehicle provided in an embodiment of the present application. The vehicle 200 may include a vehicle body and the battery charging system in the above embodiment.

[0120] In an exemplary embodiment, the vehicle may further include vehicle lights 210 , and the battery to be charged may be used to provide power for low-voltage loads such as the vehicle lights 210 .

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery charging method, characterized in that: Applied to a battery charging system, the battery charging system includes a power accumulation calculation module, a voltage converter, a DC relay, a battery manager and a power battery, and the method includes: The power accumulation calculation module detects the output current and output voltage of the battery to be charged, and determines whether the battery to be charged is in a power-deficient state according to the output current and output voltage of the battery to be charged. The power accumulation calculation module includes an EBS sensor, which is used to detect the current and voltage flowing into or out of the battery to be charged, and to perform accumulation calculation to obtain the amount of charge flowing into or out of the battery to be charged; When the battery to be charged is in a low-power state, the battery manager controls the DC relay to be attracted through a separate path, so that the voltage conversion circuit including the power battery, the DC relay and the voltage converter is turned on; The voltage converter converts the first voltage output by the power battery into a second voltage to replenish the battery to be replenished when the DC relay is in the energized state, wherein the first voltage is greater than the second voltage; The power accumulation calculation module detects the input current and input voltage of the battery to be recharged, and determines whether the battery to be recharged meets the stopping condition according to the input current and input voltage of the battery to be recharged; When the storage battery to be charged meets the stopping charging condition, the battery manager controls the DC relay to be released through a separate path so that the power battery stops charging the storage battery to be charged; The battery manager controls the DC relay to be attracted through a separate path at each preset interval or after each preset mileage, so that the voltage conversion circuit including the power battery, the DC relay and the voltage converter is turned on, and the voltage converter converts the first voltage output by the power battery into the second voltage to replenish the battery to be replenished for a preset time period.

2. The method according to claim 1, characterized in that When the battery to be charged is in a power-deficient state, before the battery manager controls the DC relay to be attracted through a separate path, the method further includes: When the power accumulation calculation module determines that the battery to be charged is in a low-power state, the power accumulation calculation module sends a first wake-up instruction to the battery manager to wake up the battery manager; The power accumulation calculation module sends a charging instruction to the battery manager, so that the battery manager confirms that the battery to be charged is in a low-power state when receiving the charging instruction; Before the voltage converter converts the first voltage output by the power battery into a second voltage to replenish the battery to be replenished, the method further includes: When the storage battery to be charged is in a power-deficient state, the battery manager sends a second wake-up instruction to the voltage converter to wake up the voltage converter.

3. The method according to claim 1, characterized in that When the battery to be charged meets the condition for stopping charging, the battery manager controls the DC relay to be released through a separate path, and before the battery manager controls the DC relay to be released, further comprising: When the power accumulation calculation module determines that the battery to be charged meets the condition for stopping charging, the power accumulation calculation module sends a stop charging instruction to the battery manager, so that the battery manager determines that the battery to be charged meets the condition for stopping charging when receiving the stop charging instruction; When the battery manager determines that the battery to be charged satisfies the condition for stopping charging, the battery manager sends a sleep instruction to the voltage converter to put the voltage converter into a sleep state; When the battery to be charged meets the condition for stopping charging, the battery manager controls the DC relay to be released through a separate path, and further includes: The battery manager enters a dormant state.

4. The method according to claim 1, characterized in that: The step of determining whether the battery to be recharged is in a power-deficient state according to the output current and output voltage of the battery to be recharged comprises: The output charge of the battery to be recharged is obtained according to the output current and output voltage of the battery to be recharged, and it is determined whether the output charge of the battery to be recharged is not less than a first preset threshold value. If the output charge of the battery to be recharged is not less than the first preset threshold value, the battery to be recharged is in a low-power state; if the output charge of the battery to be recharged is less than the first preset threshold value, the battery to be recharged is not in a low-power state.

5. The method according to claim 4, characterized in that The determining whether the battery to be recharged satisfies the condition for stopping recharging according to the input current and input voltage of the battery to be recharged comprises: The input charge of the battery to be recharged is obtained according to the input current and input voltage of the battery to be recharged, and it is determined whether the input charge of the battery to be recharged is not less than the output charge of the battery to be recharged. If the input charge of the battery to be recharged is not less than the output charge of the battery to be recharged, the battery to be recharged meets the condition for stopping recharging. If the input charge of the battery to be recharged is less than the output charge of the battery to be recharged, the battery to be recharged does not meet the condition for stopping recharging.

6. The method according to claim 1, characterized in that When the battery to be charged is in a power-deficient state, the battery manager controls the DC relay to be closed through a separate path, and further includes: The power accumulation calculation module detects the output current and output voltage of the power battery, and determines whether the power battery meets the power supply condition according to the output current and output voltage of the power battery; When the battery to be charged is in a power-deficient state, the battery manager controls the DC relay to be attracted through a separate path, including: When the storage battery to be charged is in a power-deficient state and the power battery meets the power supply condition, the battery manager controls the DC relay to be attracted through a separate path.

7. The method according to claim 6, characterized in that The determining whether the power battery meets the power supply condition according to the output current and output voltage of the power battery comprises: The output charge of the power battery is obtained according to the output current and the output voltage of the power battery, and it is determined whether the output charge of the power battery is less than a second preset threshold value; if the output charge of the power battery is less than the second preset threshold value, the power battery meets the power supply condition; if the output charge of the power battery is not less than the second preset threshold value, the power battery does not meet the power supply condition.

8. A battery charging system, characterized in that: include: A power battery, wherein the power battery is used to provide a first voltage; An electric quantity accumulation calculation module, which is connected to the battery to be charged, and is used to detect the output current and output voltage of the battery to be charged, and determine whether the battery to be charged is in a power-deficient state according to the output current and output voltage of the battery to be charged. The electric quantity accumulation calculation module includes an EBS sensor, which is used to detect the current and voltage flowing into or out of the battery to be charged, and to perform accumulation calculation to obtain the amount of charge flowing into or out of the battery to be charged; a voltage converter, the voltage converter being connected to the battery to be charged and the power battery respectively, and being used to convert a first voltage output by the power battery into a second voltage, wherein the first voltage is greater than the second voltage; a DC relay connected between the battery to be charged and the power battery through a separate path; and a battery manager, the battery manager being connected to the DC relay, the voltage converter and the power accumulation calculation module respectively, and being used for controlling the DC relay to be attracted through a separate path when the storage battery to be replenished is in a power-deficient state, so as to turn on the voltage conversion circuit including the power battery, the DC relay and the voltage converter, and to enable the voltage converter to convert the first voltage output by the power battery into the second voltage to replenish the storage battery to be replenished; The power accumulation calculation module is further used to detect the input current and input voltage of the battery to be recharged, and determine whether the battery to be recharged meets the stopping condition according to the input current and input voltage of the battery to be recharged; The battery manager is further configured to control the DC relay to release through a separate path when the storage battery to be recharged meets the stopping recharge condition, so that the power battery stops recharging the storage battery to be recharged; The battery manager is further used to control the DC relay to be attracted through a separate path at each preset interval or after each preset mileage, so that the voltage conversion circuit including the power battery, the DC relay and the voltage converter is turned on, and to enable the voltage converter to convert the first voltage output by the power battery into the second voltage to replenish the battery to be replenished for a preset time period.

9. A vehicle, characterized in that: It comprises a vehicle body and the battery charging system as claimed in claim 8.

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