A charging method, a charging device and a readable storage medium

Abstract

The embodiment of the application discloses a charging method, a charging device and a readable storage medium. The method comprises the following steps: obtaining the charging rate of a target vehicle battery and the type of the target vehicle battery from a BMS or a terminal device of a vehicle; determining the corresponding relationship between the charging voltage corresponding to the target vehicle battery and the residual capacity of the target vehicle battery, and the corresponding relationship between the charging current corresponding to the target vehicle battery and the residual capacity of the target vehicle battery according to the charging rate of the target vehicle battery and the type of the target vehicle battery; when the BMS is in an offline state, collecting the terminal voltage value of the target vehicle battery, and charging the target vehicle battery after determining the target charging current value according to the terminal voltage value of the target vehicle battery, the corresponding relationship between the charging voltage corresponding to the target vehicle battery and the residual capacity of the target vehicle battery, and the corresponding relationship between the charging current corresponding to the target vehicle battery and the residual capacity of the target vehicle battery. By adopting the embodiment of the application, the current size of the charging device can be adjusted, and the charging time is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicles, and in particular to a charging method, a charging device and a readable storage medium. BACKGROUND

[0002] With the increasing emphasis on environmental protection and low carbon, the development pace of new energy vehicles has also accelerated significantly. The relevant technologies in the fields of automobiles, energy, transportation, information communication, etc. are accelerating integration, and electrification, networking and intelligence have become the trend and trend of the automobile industry. New technologies for new energy vehicles are emerging like mushrooms, for example: application number CN202110228793.2, invention name Hybrid power system, hybrid power vehicle and control method thereof; application number CN202110231482.1, invention name Hybrid power system, hybrid power vehicle and control method thereof, vehicle controller; application number CN202110251139.3, invention name Hybrid power system, hybrid power vehicle and control method thereof, vehicle controller; application number CN202010609385.7, invention name Vehicle power generation control method and device and vehicle; all describe hybrid technology dominated by electricity, with multiple advantages such as fast, economical, quiet, smooth and green. Application number CN202311373582.3, invention name Vehicle control method, medium and vehicle; application number CN202311351004.X, invention name Vehicle braking method, brake controller, storage medium and vehicle; application number CN202311222836.1, invention name Parking method, medium and vehicle; application number CN202311164098.X, invention name Vehicle control system, method and vehicle; application number CN202311170393.6, invention name Vehicle control system, control method, controller and vehicle; application number CN202211678720.4, invention name Vehicle power control method, device, medium, vehicle controller and vehicle; application number CN202211469445.5, invention name Vehicle and control method, device and medium, electronic equipment thereof; application number CN202210182808.0, invention name Tire pressure identification device and vehicle; application number CN202110744962.8, invention name Electric drive assembly, four-wheel drive system and automobile; application number CN202110474242.4, invention name Steering control method for vehicle, electronic control unit, system and vehicle; application number CN202110351399.8, invention name Brake control method, device, medium and electronic equipment; all describe a power system with four-wheel independent drive as the core, which greatly improves the safety and power of new energy vehicles.

[0003] With the development of new energy technology in recent years, users have higher and higher performance requirements for electric vehicles, and the demand for charging equipment is also increasing. Users are also increasingly concerned about the time it takes for charging equipment to charge vehicle batteries. Charging equipment can be a device or equipment used to charge independent batteries or batteries in vehicles, such as charging piles, which are usually installed at charging stations or parking lots and the like, and can provide different types of charging services such as direct current fast charging and alternating current slow charging.

[0004] The output current of the existing charging equipment changes according to the charging demand information of the vehicle battery reported by the battery management system (BMS). After receiving the charging demand information, the charging equipment outputs the corresponding charging current. If the communication between the BMS of the vehicle and the charging equipment fails, that is, the BMS is in an offline state, the charging equipment cannot provide a charging current according to the charging demand of the vehicle battery. Currently, when the BMS is in an offline state, the charging equipment defaults to charging the vehicle battery with the smallest charging current, resulting in a long charging time for the vehicle battery. SUMMARY

[0005] The embodiments of the present application provide a charging method, a charging device and a readable storage medium, which can adjust the current size of the charging device and shorten the charging time of the target vehicle battery.

[0006] The present application will be described from different aspects below. It should be understood that the embodiments and advantages of the different aspects below can be mutually referred to.

[0007] In a first aspect, the embodiments of the present application provide a charging method, which can be applied to a charging device. The method comprises:

[0008] The charging device obtains the charging rate of a target vehicle battery and the type of the target vehicle battery from a battery management system or a terminal device of a vehicle. The charging device determines the corresponding relationship between the charging voltage and the remaining capacity of the target vehicle battery corresponding to the target vehicle battery, and the corresponding relationship between the charging current and the remaining capacity of the target vehicle battery corresponding to the target vehicle battery according to the charging rate of the target vehicle battery and the type of the target vehicle battery. When the battery management system is in an offline state, the charging device collects the terminal voltage value of the target vehicle battery. The charging device determines the target charging current value according to the terminal voltage value of the target vehicle battery, the corresponding relationship between the charging voltage and the remaining capacity of the target vehicle battery corresponding to the target vehicle battery, and the corresponding relationship between the charging current and the remaining capacity of the target vehicle battery corresponding to the target vehicle battery. The charging device charges the target vehicle battery according to the target charging current value.

[0009] In the embodiments of the present application, according to the charging rate of the target vehicle battery and the type of the target vehicle battery, the charging device can determine the correspondence between the charging voltage and the remaining capacity of the target vehicle battery, and the correspondence between the charging current and the remaining capacity of the target vehicle battery. When the battery management system is in an offline state, the charging device can collect the terminal voltage value of the target vehicle battery, and then determine the target charging current value according to the terminal voltage value of the target vehicle battery, the correspondence between the charging voltage and the remaining capacity of the target vehicle battery, and the correspondence between the charging current and the remaining capacity of the target vehicle battery, so that the charging device can charge the target vehicle battery according to the target charging current value. During the charging process of the target vehicle battery by the charging device, the terminal voltage value (charging voltage) of the target vehicle battery changes with the change of the remaining capacity, and the target charging current value (charging current) changes with the change of the remaining capacity. Therefore, when the BMS is in an offline state, the current of the charging device can still be adjusted, and the charging time of the target vehicle battery can be shortened.

[0010] In combination with the first aspect, in a possible implementation, the charging device obtains the charging rate of the target vehicle battery and the type of the battery from the battery management system of the vehicle, including:

[0011] When the battery management system is in an online state, the charging device sends a query instruction to the battery management system of the vehicle, the query instruction being used to query the charging rate of the target vehicle battery and the type of the target vehicle battery; the charging device receives a response message returned by the battery management system, the response message including the charging rate of the target vehicle battery and the type of the target vehicle battery.

[0012] In the embodiments of the present application, when the battery management system is in an online state, the charging device can effectively communicate with the battery management system of the vehicle and perform data transmission. Therefore, the charging device can obtain the charging rate of the target vehicle battery and the type of the target vehicle battery through the battery management system of the vehicle. Even if the battery management system is in an offline state subsequently, that is, the charging device cannot effectively communicate with the battery management system of the vehicle, the charging rate of the target vehicle battery and the type of the target vehicle battery obtained when the battery management system is in an online state can still be used.

[0013] In combination with the first aspect, in a possible implementation, the charging device obtains the charging rate of the target vehicle battery and the type of the battery from the terminal device, including:

[0014] When the battery management system is in an offline state, the charging device sends a notification message to the terminal device, the notification message being used to notify that the battery management system of the vehicle is in an offline state and request to obtain the charging rate of the target vehicle battery and the type of the target vehicle battery; the charging device receives information from the terminal device, the information including the charging rate of the target vehicle battery and the type of the target vehicle battery.

[0015] In the embodiments of the present application, when the battery management system is in an offline state, the charging device can effectively communicate with the terminal device (such as a mobile phone) and perform data transmission. Because the terminal device can communicate with the battery management system of the vehicle and obtain the charging rate of the target vehicle battery and the type of the target vehicle battery in real time. Therefore, the charging device can send a notification message to the terminal device to request to obtain the charging rate of the target vehicle battery and the type of the target vehicle battery. Even if the battery management system is in an offline state all the time, the charging rate of the target vehicle battery and the type of the target vehicle battery can be indirectly obtained through the terminal device.

[0016] In combination with the first aspect, in a feasible implementation manner, the charging device determines, according to the charging rate of the target vehicle battery and the type of the target vehicle battery, a corresponding relationship between the charging voltage and the remaining capacity corresponding to the target vehicle battery and a corresponding relationship between the charging current and the remaining capacity corresponding to the target vehicle battery, including:

[0017] The charging device determines, from a database, a plurality of sets of relationship graphs corresponding to the type of the target vehicle battery; the plurality of sets of relationship graphs include corresponding relationships between charging voltages and remaining capacities and corresponding relationships between charging currents and remaining capacities of the same type of battery under different charging rates; the charging device determines, from the plurality of sets of relationship graphs, a set of relationship graphs corresponding to the charging rate of the target vehicle battery; the set of relationship graphs include the corresponding relationship between the charging voltage and the remaining capacity corresponding to the target vehicle battery and the corresponding relationship between the charging current and the remaining capacity corresponding to the target vehicle battery.

[0018] In combination with the first aspect, in a feasible implementation manner, the charging device determines, according to the terminal voltage value of the target vehicle battery, the corresponding relationship between the charging voltage and the remaining capacity corresponding to the target vehicle battery, and the corresponding relationship between the charging current and the remaining capacity corresponding to the target vehicle battery, a target charging current value, including:

[0019] The charging device determines, from the corresponding relationship between the charging voltage and the remaining capacity corresponding to the target vehicle battery, a remaining capacity value corresponding to the terminal voltage value of the target vehicle battery; the charging device determines, from the corresponding relationship between the charging current and the remaining capacity corresponding to the target vehicle battery, a charging current value corresponding to the remaining capacity value; and the charging current value is determined as the target charging current value.

[0020] In a second aspect, the embodiments of the present application provide a charging device for executing the method in the first aspect or any possible implementation manner of the first aspect. The charging device comprises:

[0021] an acquisition module configured to acquire a charging rate of a target vehicle battery and a type of the target vehicle battery from a battery management system or a terminal device of a vehicle;

[0022] a determination module configured to determine a corresponding relationship between a charging voltage and a remaining capacity of the target vehicle battery and a corresponding relationship between a charging current and the remaining capacity of the target vehicle battery according to the charging rate of the target vehicle battery and the type of the target vehicle battery;

[0023] a collection module configured to collect an end voltage value of the target vehicle battery when the battery management system is in an offline state;

[0024] The determination module is further configured to determine a target charging current value according to the end voltage value of the target vehicle battery, the corresponding relationship between the charging voltage and the remaining capacity of the target vehicle battery, and the corresponding relationship between the charging current and the remaining capacity of the target vehicle battery.

[0025] a charging module configured to charge the target vehicle battery according to the target charging current value.

[0026] With reference to the second aspect, in a possible implementation manner, the acquisition module is specifically configured to send a query instruction to the battery management system of the vehicle when the battery management system is in an online state, the query instruction being used to query the charging rate of the target vehicle battery and the type of the target vehicle battery; and the acquisition module is specifically configured to receive a response message returned by the battery management system, the response message comprising the charging rate of the target vehicle battery and the type of the target vehicle battery.

[0027] With reference to the second aspect, in a possible implementation manner, the acquisition module is specifically configured to send a notification message to the terminal device when the battery management system is in an offline state, the notification message being used to notify that the battery management system of the vehicle is in the offline state and request to acquire the charging rate of the target vehicle battery and the type of the target vehicle battery; and the acquisition module is specifically configured to receive information from the terminal device, the information comprising the charging rate of the target vehicle battery and the type of the target vehicle battery.

[0028] In a possible implementation of the second aspect, the determining module is specifically configured to determine, from the database, a plurality of sets of relationship graphs corresponding to the type of the target vehicle battery; the plurality of sets of relationship graphs include corresponding relationships between charging voltages and remaining capacities of the same type of battery at different charging rates, and corresponding relationships between charging currents and the remaining capacities; the determining module is specifically configured to determine, from the plurality of sets of relationship graphs, a set of relationship graphs corresponding to the charging rate of the target vehicle battery; the set of relationship graphs includes corresponding relationships between the charging voltage corresponding to the target vehicle battery and the remaining capacity, and corresponding relationships between the charging current corresponding to the target vehicle battery and the remaining capacity.

[0029] In a possible implementation of the second aspect, the determining module is specifically configured to determine, from the corresponding relationship between the charging voltage corresponding to the target vehicle battery and the remaining capacity, a remaining capacity value corresponding to an end voltage value of the target vehicle battery; and the determining module is specifically configured to determine, from the corresponding relationship between the charging current corresponding to the target vehicle battery and the remaining capacity, a charging current value corresponding to the remaining capacity value.

[0030] In a possible implementation of the third aspect, the charging device can include a processor, a memory, and a network interface. The network interface is configured to provide a data communication function, the memory is configured to store a computer program, and the processor is configured to invoke the computer program to enable the charging device to perform the charging method provided in the first aspect or any possible implementation of the first aspect, and achieve the beneficial effects of the charging method provided in the first aspect.

[0031] In a possible implementation of the fourth aspect, the computer readable storage medium is configured to store a computer program. When the computer program runs on the communication device, the charging device performs the charging method provided in the first aspect or any possible implementation of the first aspect, and achieves the beneficial effects of the charging method provided in the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0033] Figure 1 is a charging scene schematic diagram provided by an embodiment of the present application;

[0034] Figure 2is a flowchart of a charging method provided by an embodiment of the present application;

[0035] Figure 3 is a schematic diagram of a relationship corresponding to different charging rates provided by an embodiment of the present application;

[0036] Figure 4 is a structural schematic diagram of a database of a charging device provided by an embodiment of the present application;

[0037] Figure 5 is a structural schematic diagram of a charging device provided by an embodiment of the present application;

[0038] Figure 6 is a structural schematic diagram of a charging device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0040] In the description of the present application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this document is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean: A alone, A and B together, B alone, and the like. In addition, "at least one" means one or more, and "multiple" means two or more. "At least one" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can mean: a, b, c; a and b; a and c; b and c; or a and b and c. Where a, b, and c can be single or multiple.

[0041] In the present application, the words "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design scheme described as "exemplary", "for example" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "exemplary", "for example" or "for example" is intended to present the relevant concept in a specific manner.

[0042] It should be understood that in the present application, "when", "if" and "whether" refer to the device making corresponding processing under certain objective conditions, not limited in time, and do not require the device to have a judgment action when implemented, nor does it mean that there are other limitations.

[0043] In the present application, the use of singular elements is intended to represent "one or more", not "one and only one", unless otherwise specified.

[0044] It can be understood that in the embodiments of the present application, "A corresponds to B" means that A and B have a corresponding relationship, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean that B is determined only according to A, but B can also be determined according to A and / or other information.

[0045] The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

[0046] Referring to Figure 1 , Figure 1 is a charging scenario provided by an embodiment of the present application. As Figure 1 indicated, the charging device in the charging scenario of the present application can charge the vehicle battery through the cable, and obtain the information of the vehicle battery through the Controller Area Network (CAN) bus.

[0047] Exemplarily, Figure 1 The charging device can be a charging pile, a charging column, a charging station, a mobile charging device, a portable charging device, etc., which can be used to charge the vehicle and provide data transmission and other functions. In the embodiments of the present application, the vehicle battery refers to a key component for storing electrical energy in an electric vehicle or a hybrid vehicle, which is used to provide power for the electric vehicle. The vehicle battery is usually located at the bottom or rear of the vehicle, and can include ternary lithium ion battery, iron lithium phosphate battery, nickel hydrogen battery, lead-acid battery, sodium ion battery, lithium-sulfur battery, solid-state battery, lithium-titanium oxide battery, and other batteries that can provide electrical energy for the vehicle. The vehicle battery can be referred to as "vehicle battery", "vehicle battery", "vehicle-mounted battery", "battery pack", "power battery" or "battery pack", etc. The present application is not limited herein.

[0048] Referring to Figure 2 , Figure 2 is a flowchart of a charging method provided by an embodiment of the present application. As Figure 2 indicated, the method includes but is not limited to the following steps:

[0049] Step S101: The charging device obtains the charging rate of the target vehicle battery and the type of the target vehicle battery from the battery management system or the terminal device of the vehicle.

[0050] The charging device obtains the charging rate of the vehicle battery and the type of the vehicle battery in two ways. One way is that the charging device directly obtains the information from the battery management system of the vehicle, but the battery management system needs to be in an online state. The other way is that the charging device indirectly obtains the information from the terminal device, but the charging device and the terminal device need to be able to communicate with each other.

[0051] In a possible implementation, when the battery management system is in an online state, the charging device sends a query instruction to the battery management system of the vehicle, and the query instruction is used to query the charging rate of the target vehicle battery and the type of the target vehicle battery. The charging device receives a response message returned by the battery management system, and the response message includes the charging rate of the target vehicle battery and the type of the target vehicle battery.

[0052] It should be understood that the battery management system being in an online state means that the BMS and the charging device have established an effective communication connection and can transmit data in real time. In this online state, the BMS can receive the query instruction from the charging device and respond in time, and provide the charging rate of the vehicle battery and the type of the vehicle battery and other information required by the charging device according to the query instruction. On the contrary, the battery management system being in an offline state means that the BMS and the charging device have lost the effective communication connection and cannot transmit data. In this case, the BMS cannot receive the query instruction from the charging device, and the BMS cannot provide the charging rate of the vehicle battery and the type of the vehicle battery and other information to the charging device. The reasons for the BMS being in an offline state can include a disconnection state caused by communication failure, charging device failure, network problems, or other technical obstacles.

[0053] For example, the query instruction can be sent in a specific data format and communication protocol. The specific data format and communication protocol between the charging device and the BMS can ensure that the charging device can correctly identify and parse the response of the BMS. For example, the Open Charge Point Protocol (OCPP) can be used as an open communication protocol for communication between the charging device and the BMS. In OCPP, the query instruction can be encapsulated in JavaScript Object Notation (JSON) format and transmitted through WebSocket or HTTP protocol. The specific format and fields of the query instruction can vary depending on the protocol version and implementation, but generally can include information such as identifying the type of instruction, request parameters, etc. For another example, the ISO15118 standard defines the protocol for communication between electric vehicles and charging devices, as well as specific message types for charging devices to query vehicle battery information. The message type is usually encoded in ASN.1 format and transmitted using a security protocol such as TLS (Transport Layer Security).

[0054] When the BMS of the vehicle receives the query instruction sent by the charging device, the BMS parses the query instruction and returns a response. The BMS can extract the charging rate of the target vehicle battery and the type of the target vehicle battery from its storage space according to the content of the query instruction, and encapsulate them into a response message and return them to the charging device.

[0055] It should be understood that the type of vehicle battery can refer to the chemical material and structure of the vehicle battery. Common battery types can include lithium-ion batteries, nickel-hydrogen batteries, lead-acid batteries, etc. For example, lithium-ion batteries are one of the most commonly used battery types in new energy vehicles, including ternary lithium-ion batteries and lithium iron phosphate batteries. For another example, nickel-hydrogen batteries are widely used in hybrid electric vehicles and electric vehicles, and their main features are environmental protection and long service life.

[0056] It should be understood that the charging rate of the vehicle battery (also known as the charging rate) can refer to the current size of the vehicle battery charged or discharged in a unit of time. The charging rate of the vehicle battery is usually expressed in multiples of the battery capacity. For example, C represents the battery capacity. If C is 100 Ah, then charging the vehicle battery at a charging rate of 1C in a unit of time can mean charging the vehicle battery with a current size of 100 A in a unit of time. If C is 10 Ah, then charging the vehicle battery at a charging rate of 1C in a unit of time can mean charging the vehicle battery with a current size of 10 A in a unit of time. The above examples show that even if the charging rate is 1C, because the battery capacity is different, the current size of the charging in a unit of time is different. Therefore, the charging rate of the vehicle battery is related to the capacity of the vehicle battery, and is expressed in multiples of its capacity, such as 0.2C, 2C, 3C.

[0057] For example, the BMS can estimate the current charging rate of the battery by continuously monitoring the terminal voltage, charging current, temperature and other parameters of the vehicle battery. In addition, the BMS can also record and analyze the historical data of the vehicle battery, which can include current, voltage, temperature and other information during charging and discharging. Through the analysis of the historical data, the BMS can more accurately estimate the charging rate of the battery. The method of calculating the charging rate of the vehicle battery by the BMS is not limited here.

[0058] In another possible implementation, when the battery management system is in an offline state, the charging device sends a notification message to the terminal device, the notification message being used to notify that the battery management system of the vehicle is in an offline state and to request to obtain the charging rate of the target vehicle battery and the type of the target vehicle battery; the charging device receives information from the terminal device, the information including the charging rate of the target vehicle battery and the type of the target vehicle battery.

[0059] Exemplarily, when the charging device detects that it is in an offline state with the BMS but in an online state with the terminal device, the charging device sends a notification message to the terminal device. The notification message can be used to notify that the charging device is in an offline state with the BMS, i.e., the current BMS cannot communicate with the charging device, and the communication message can also be used to request the terminal device to obtain the charging rate of the target vehicle battery and the type of the target vehicle battery. After receiving the notification message sent by the charging device, the terminal device can display a corresponding prompt or warning message on the user interface of the terminal device. Exemplarily, the prompt or warning message can be: the battery management system is in an offline state, the vehicle is charging the target vehicle battery at the minimum rate, and if you want to increase the charging rate, the charging device requests to obtain the charging rate of the target vehicle battery and the type of the target vehicle battery. Exemplarily, the terminal device can confirm whether the user agrees to provide the charging rate of the target vehicle battery and the type of the target vehicle battery according to the request in the notification message, and if the user inputs an agreement instruction on the terminal device, the terminal device can send a confirmation instruction to the charging device, the confirmation instruction including the charging rate of the target vehicle battery and the type of the target vehicle battery. The charging device receives the charging rate of the target vehicle battery and the type of the target vehicle battery from the terminal device.

[0060] Exemplarily, after receiving the above notification message, the terminal device can also obtain the charging rate of the target vehicle battery and the type of the target vehicle battery from the BMS without user agreement, and send the obtained charging rate of the target vehicle battery and the type of the target vehicle battery to the charging device.

[0061] It should be understood that the terminal device in the embodiment can be a smartphone, a notebook computer, a tablet computer, an Internet of Things device, etc. The terminal device can provide data transmission, including wired terminals and wireless terminals. The wireless terminal can be a handheld device with wireless connection function, or other processing devices connected to a wireless modem, a mobile terminal communicating with one or more core networks through a radio access network (RAN). For example, the wireless terminal can be a mobile phone, a computer, a tablet computer, a personal digital assistant (PDA), a mobile internet device (MID), a wearable device, and an e-book reader (E-book Reader), etc.

[0062] Step S102: The charging device determines the correspondence between the charging voltage and the remaining power corresponding to the target vehicle battery according to the charging rate of the target vehicle battery and the type of the target vehicle battery, and the correspondence between the charging current and the remaining power corresponding to the target vehicle battery.

[0063] In a possible implementation, before the step S102, each type of vehicle battery can be charged at different charging rates, and the terminal voltage, charging current, and residual capacity of the vehicle battery during charging are recorded. Based on the experimental data, the correspondence between the charging voltage and the residual capacity, and the correspondence between the charging current and the residual capacity can be obtained and stored in the database of the charging device in advance.

[0064] Optionally, based on the above-obtained experimental data of the terminal voltage, charging current, and residual capacity of the vehicle battery, a mathematical modeling method can be used to determine the correspondence between the charging voltage and the residual capacity of the vehicle battery, and the correspondence between the charging current and the residual capacity of the vehicle battery. For example, a polynomial fitting method can be used to establish the relationship between the charging voltage and the residual capacity, and a linear regression method can be used to establish the relationship between the charging current and the residual capacity. The experimental data of the terminal voltage, charging current, and residual capacity of the vehicle battery can be sorted into a relational correspondence table, a relational correspondence graph, and / or a relational correspondence array by using a mathematical model, and the corresponding relational correspondence table, relational correspondence graph, and / or relational correspondence array can be stored in the storage space (such as a database) of the charging device.

[0065] In a possible implementation, the charging device can query, from the database, a plurality of sets of relational graphs corresponding to the type of the target vehicle battery. The plurality of sets of relational graphs include the correspondence between the charging voltage and the residual capacity of the batteries belonging to the same type as the target vehicle battery at different charging rates, and the correspondence between the charging current and the residual capacity. The charging device can determine, from the plurality of sets of relational graphs, a set of relational graphs corresponding to the charging rate of the target vehicle battery. The set of relational graphs includes the correspondence between the charging voltage and the residual capacity of the target vehicle battery corresponding to the charging rate of the target vehicle battery, and the correspondence between the charging current and the residual capacity corresponding to the target vehicle battery.

[0066] It should be understood that the charging device can store a plurality of sets of relational graphs corresponding to the type of the vehicle battery in the database thereof. The database of the charging device stores the relationship between the charging voltage and the residual capacity, and the correspondence between the charging current and the residual capacity according to the charging rate of the vehicle battery and the type of the vehicle battery. The relationship between the charging voltage and the residual capacity, and the correspondence between the charging current and the residual capacity can be stored in the storage space in the form of a relational graph, a relational table, and / or a relational array (data structure). Therefore, the charging device can determine, from the database, a plurality of sets of relational graphs corresponding to the type of the target vehicle battery, and determine, from the plurality of sets of relational graphs, a set of relational graphs corresponding to the charging rate of the target vehicle battery.

[0067] For example, refer to Figure 3 , Figure 3 is a relationship diagram corresponding to different charging rates provided by an embodiment of the present application. A plurality of relationship diagrams of the same type of battery under different charging rates are stored in the database of the charging device for the same type of battery. The plurality of relationship diagrams of the same type of battery under different charging rates mainly include a corresponding relationship diagram between the charging voltage and the remaining capacity of the vehicle battery, a corresponding relationship diagram between the charging current and the remaining capacity of the vehicle battery, and a corresponding relationship diagram between the state of health and the number of charge-discharge cycles of the vehicle battery.

[0068] As shown in Figure 3 , when the charging rate of a certain type of battery is C1, the I-Q relationship diagram represents the corresponding relationship between the charging voltage and the remaining capacity of the vehicle battery, the Q-V relationship diagram represents the corresponding relationship between the charging current and the remaining capacity of the vehicle battery, and the SOH-Cycle relationship diagram represents the corresponding relationship between the state of health and the number of charge-discharge cycles of the vehicle battery. The experiment can measure the different rates of each type of battery corresponding to the vehicle, from the initial charging rate C1 to the charging rate C n , each type of battery corresponds to a plurality of different I-Q relationship diagrams, Q-V relationship diagrams, and SOH-Cycle relationship diagrams, and a set of relationship diagrams can include the I-Q relationship diagram, the Q-V relationship diagram, and the SOH-Cycle relationship diagram of the same type of battery under the same charging rate.

[0069] Step S103: When the battery management system is in an offline state, the charging device collects the terminal voltage value of the target vehicle battery, and determines the target charging current value according to the terminal voltage value of the target vehicle battery, the corresponding relationship between the charging voltage and the remaining capacity of the target vehicle battery, and the corresponding relationship between the charging current and the remaining capacity of the target vehicle battery.

[0070] In a possible implementation, when the battery management system is in an offline state, the charging device cannot directly obtain the terminal voltage value of the target vehicle battery from the battery management system in real time. For example, the charging device can directly measure the terminal voltage value of the target vehicle battery through an internal voltage sensor or measuring device. The sensor or measuring device can be connected to the positive and negative electrodes of the target vehicle battery to obtain the terminal voltage value of the target vehicle battery. After the charging device obtains the terminal voltage value of the target vehicle battery, the sensor in the charging device converts the terminal voltage value of the target vehicle battery into a digital signal or an analog signal, and then displays or records the terminal voltage value of the target vehicle battery in the charging device after processing by the processing circuit or microcontroller in the charging device. After the charging device collects the terminal voltage value of the target vehicle battery, the target charging current value can be determined according to the relationship diagram in the database obtained through the above experimental measurement.

[0071] In a possible implementation, the charging device determines, from the correspondence between the charging voltage and the remaining capacity of the target vehicle battery, a remaining capacity value corresponding to the terminal voltage value of the target vehicle battery; the charging device determines, from the correspondence between the charging current and the remaining capacity of the target vehicle battery, a charging current value corresponding to the remaining capacity value; and the charging device determines the charging current value as the target charging current value.

[0072] It should be understood that when the battery management system is in an offline state, after the charging device collects the terminal voltage value of the target vehicle battery, the charging device sends a first query instruction to its database according to the terminal voltage value of the target vehicle battery, and the first query instruction is used to obtain, from the correspondence between the charging voltage and the remaining capacity of the vehicle battery, a remaining capacity value corresponding to the terminal voltage value of the target vehicle battery. According to the obtained remaining capacity value, the charging device sends a second query instruction to its database, and the second query instruction is used to obtain, from the correspondence between the charging current and the remaining capacity of the vehicle battery, a charging current value corresponding to the remaining capacity value. The charging device determines the obtained charging current value as the target charging current value.

[0073] For example, the charging device obtains from the battery management system or the terminal device of the vehicle that the charging rate of the target vehicle battery is 10A, and the type of the target vehicle battery is a lithium iron phosphate battery. The charging device can query the corresponding relationship diagram between the charging voltage and the remaining capacity of the target vehicle battery corresponding to the charging rate of 10A and the lithium iron phosphate battery in the database of the charging pile according to the charging rate of 10A and the lithium iron phosphate battery, and the corresponding relationship diagram between the charging current and the remaining capacity of the target vehicle battery. When the charging device collects the terminal voltage value of the target vehicle battery, the charging device sends a first query instruction to its database, which is used to obtain the remaining capacity value corresponding to the terminal voltage value of the target vehicle battery from the corresponding relationship diagram between the charging voltage and the remaining capacity of the vehicle battery. According to the obtained remaining capacity value, the charging device sends a second query instruction to its database, which is used to obtain the charging current value corresponding to the remaining capacity value from the corresponding relationship between the charging current and the remaining capacity of the vehicle battery. The charging device determines the obtained charging current value as the target charging current value.

[0074] For example, referring to Figure 4 , Figure 4 is a structural diagram of a database of a charging device provided by an embodiment of the present application. As shown in Figure 4 , the structural diagram of the database of the charging device provided by an embodiment of the present application includes but is not limited to a target vehicle battery basic information database table, a target vehicle battery state information database table, a vehicle battery working condition information database table, a Q-V corresponding relationship diagram database table, and an I-Q corresponding relationship diagram database table. The data in the target vehicle battery basic information database table and the target vehicle battery state information database table is obtained by the charging device from the BMS of the target vehicle battery. The data in the vehicle battery working condition information database table, the Q-V corresponding relationship diagram database table, and the I-Q corresponding relationship diagram database table is obtained by experimental measurement and stored in the storage space of the charging device. It should be understood that the vehicle battery working condition information database table can be measured in combination with the charging rate of the vehicle battery, the temperature of the vehicle battery, the health status of the vehicle battery, safety, stability and other factors. The specific experimental factors need to be determined according to the design of the vehicle and the vehicle battery, and the present embodiment is only an example, which is not limited herein.

[0075] The working condition information database table of the vehicle battery can include the identification number of the vehicle, the type of the vehicle battery, the number of the vehicle battery, the charging rate of the vehicle battery, the state of health (SOH) of the vehicle battery, the cycle of the vehicle battery, the temperature of the vehicle battery, the terminal voltage of the vehicle battery, the charging current of the vehicle battery, the capacity of the vehicle battery, the physical parameters (such as size, weight, etc.) of the vehicle battery, the SOH-cycle corresponding relationship number, the Q-V corresponding relationship number, and the I-Q corresponding relationship number. The identification number of the vehicle is the primary key of the basic information database table of the target vehicle battery and is the unique identifier of the database table. The charging device can associate the identification number of the vehicle with the state information database table of the target vehicle battery or other database tables. The number of the vehicle battery is the foreign key of the working condition information database table of the vehicle battery, and the charging device can associate the number of the vehicle battery with the basic information database table of the target vehicle battery or other database tables. The Q-V corresponding relationship number is the foreign key of the working condition information database table of the vehicle battery, and the charging device can associate the Q-V corresponding relationship number with the Q-V corresponding relationship graph database table or other database tables. The I-Q corresponding relationship number is the foreign key of the working condition information database table of the vehicle battery, and the charging device can associate the I-Q corresponding relationship number with the I-Q corresponding relationship graph database table or other database tables.

[0076] For example, when the charging device obtains the charging rate of the target vehicle battery and the type of the target vehicle battery, the charging device can associate the number of the target vehicle battery and the target vehicle battery state number with the working condition information database table of the vehicle battery, find the working condition information database table of the vehicle battery corresponding to the number of the target vehicle battery and the target vehicle battery state number, and obtain the Q-V corresponding relationship number, the I-Q corresponding relationship number, the SOH-cycle corresponding relationship number, and other information from the corresponding working condition information database table of the vehicle battery. For example, the charging device can find the corresponding relationship between the charging voltage and the remaining capacity of the target vehicle battery, the corresponding relationship between the charging current and the remaining capacity of the target vehicle battery, and the corresponding relationship between the state of health and the cycle of the target vehicle battery according to the Q-V corresponding relationship number, the I-Q corresponding relationship number, and the SOH-cycle corresponding relationship number.

[0077] The basic information database table of the target vehicle battery can include a target vehicle battery number, a target vehicle battery model, a target vehicle battery type, target vehicle battery manufacturer and supplier information, and target vehicle battery physical parameters (such as size, weight, etc.). Among them, the target vehicle battery number is the primary key of the basic information database table of the target vehicle battery, which is the unique identifier of the database table, and the charging device can associate the target vehicle battery number with the vehicle battery working condition information database table or other database tables. The target vehicle battery type is the foreign key of the basic information database table of the target vehicle battery, and the charging device can associate the target vehicle battery type with the vehicle battery working condition information database table or other database tables.

[0078] For example, when the charging device obtains the basic information of the target vehicle battery, such as the target vehicle battery model, the target vehicle battery type, etc., the charging device can find the vehicle battery working condition information database table corresponding to the basic information of the target vehicle battery through the association relationship between the target vehicle battery number and the vehicle battery working condition information database table.

[0079] The state information database table of the target vehicle battery can include a target vehicle battery state number, a target vehicle identification number, a target vehicle battery charging rate, a target vehicle battery state of health (SOH), a target vehicle battery cycle, a target vehicle battery temperature, a target vehicle battery end voltage, a target vehicle battery charging current, a target vehicle battery capacity, a target vehicle battery remaining capacity change (SOC), and target vehicle battery physical parameters (such as size, weight, etc.). Among them, the target vehicle battery state number is the primary key of the basic information database table of the target vehicle battery, which is the unique identifier of the database table, and the charging device can associate the target vehicle battery state number with the vehicle battery working condition information database table or other database tables. The vehicle identification number and the target vehicle battery charging rate are the foreign keys of the basic information database table of the target vehicle battery, and the charging device can associate the vehicle identification number and / or the target vehicle battery charging rate with the vehicle battery working condition information database table or other database tables.

[0080] For example, when the charging device obtains the state information of the target vehicle battery, such as the target vehicle battery charging rate, the target vehicle battery state of health (SOH), the target vehicle battery cycle, etc., the charging device can find the vehicle battery working condition information database table corresponding to the state information of the target vehicle battery through the association relationship between the target vehicle battery state number and the vehicle battery working condition information database table.

[0081] The Q-V correspondence graph database table can include a Q-V correspondence number, a charging voltage (V) of the vehicle battery, a remaining capacity (Q) of the vehicle battery, and an I-Q correspondence number. The Q-V correspondence number is the primary key of the Q-V correspondence graph database table and is the unique identifier of the database table. The charging device can associate the Q-V correspondence number with the vehicle battery operating condition information database table or other database tables. The I-Q correspondence number is the foreign key of the Q-V correspondence graph database table. The charging device can associate the I-Q correspondence number with the I-Q correspondence graph database table or other database tables.

[0082] The I-Q correspondence graph database table can include an I-Q correspondence number, a charging current (I) of the vehicle battery, and a remaining capacity (Q) of the vehicle battery. The I-Q correspondence number is the primary key of the I-Q correspondence graph database table and is the unique identifier of the database table. The charging device can associate the I-Q correspondence number with the vehicle battery operating condition information database table or other database tables.

[0083] For example, the charging device can find the correspondence between the charging voltage and the remaining capacity of the target vehicle battery, the correspondence between the charging current and the remaining capacity of the target vehicle battery, and the correspondence between the health status and the number of charge-discharge cycles of the target vehicle battery according to the Q-V correspondence number, the I-Q correspondence number, and the SOH-Cycle correspondence number.

[0084] For example, the charging device can obtain the charging current value according to the real-time collected terminal voltage of the target vehicle battery, the correspondence between the charging voltage and the remaining capacity of the target vehicle battery, and the correspondence between the charging current and the remaining capacity of the target vehicle battery obtained from the Q-V correspondence graph database table and the I-Q correspondence graph database table.

[0085] Step S104: The charging device charges the target vehicle battery according to the target charging current value.

[0086] In a possible implementation, the charging device starts a charging process and begins to deliver electric energy to the target vehicle battery. The charging device charges the target vehicle battery according to the target charging current value. The charging device can monitor the current in real time through a current sensor, and ensure that the charging current value of the target vehicle battery matches the determined target charging current value. The charging device continues to deliver electric energy to the target vehicle battery until a preset charging termination condition is reached, for example, when the target charging current value obtained by the charging device is zero or close to zero, the charging device stops power supply, indicating that the target vehicle battery is fully charged at this time.

[0087] In the embodiment of the application, the charging device obtains the charging rate of the target vehicle battery and the type of the target vehicle battery from the battery management system or the terminal device of the vehicle. Then, the charging device determines the correspondence between the charging voltage and the remaining capacity of the target vehicle battery, and the correspondence between the charging current and the remaining capacity of the target vehicle battery according to the charging rate of the target vehicle battery and the type of the target vehicle battery. When the battery management system is in an offline state, the charging device collects the terminal voltage value of the target vehicle battery. The charging device determines the target charging current value according to the terminal voltage value of the target vehicle battery, the correspondence between the charging voltage and the remaining capacity of the target vehicle battery, and the correspondence between the charging current and the remaining capacity of the target vehicle battery. Finally, the charging device charges the target vehicle battery according to the target charging current value. During the charging process of the target vehicle battery by the charging device, the terminal voltage value (charging voltage) of the target vehicle battery changes with the change of the remaining capacity, and the target charging current value (charging current) changes with the change of the remaining capacity. Therefore, when the BMS is in an offline state, the current size of the charging device can be adjusted to shorten the charging time of the target vehicle battery. In addition, when the BMS is in an offline state, the current size of the charging device can still be adjusted, and when the target vehicle battery is fully charged, the charging device adjusts the current size to zero or close to zero (A), that is, the charging device stops charging the target vehicle battery, which can avoid overcharging of the target vehicle battery and improve the performance and life of the target vehicle battery.

[0088] The above describes the method of the embodiment of the application in detail, and the device of the embodiment of the application is provided below.

[0089] Please refer to Figure 5 , Figure 5 is a structural schematic diagram of a charging device provided by the embodiment of the application, which can include:

[0090] The acquisition module 401 is configured to acquire the charging rate of the target vehicle battery and the type of the target vehicle battery from the battery management system or the terminal device of the vehicle.

[0091] The determining module 402 is configured to determine a correspondence between the charging voltage and the remaining capacity of the target vehicle battery and a correspondence between the charging current and the remaining capacity of the target vehicle battery according to the charging rate of the target vehicle battery and the type of the target vehicle battery.

[0092] The collecting module 403 is configured to collect the terminal voltage value of the target vehicle battery when the battery management system is in an offline state.

[0093] The determining module 402 is further configured to determine the target charging current value according to the terminal voltage value of the target vehicle battery, the correspondence between the charging voltage and the remaining capacity of the target vehicle battery, and the correspondence between the charging current and the remaining capacity of the target vehicle battery.

[0094] The charging module 404 is configured to charge the target vehicle battery according to the target charging current value.

[0095] In a feasible implementation, the obtaining module 401 is specifically configured to send a query instruction to the battery management system of the vehicle when the battery management system is in an online state, where the query instruction is used to query the charging rate of the target vehicle battery and the type of the target vehicle battery; and the obtaining module 401 is specifically configured to receive a response message returned by the battery management system, where the response message includes the charging rate of the target vehicle battery and the type of the target vehicle battery.

[0096] In a feasible implementation, the obtaining module 401 is specifically configured to send a notification message to the terminal device when the battery management system is in an offline state, where the notification message is used to notify that the battery management system of the vehicle is in an offline state and request to obtain the charging rate of the target vehicle battery and the type of the target vehicle battery; and the obtaining module 401 is specifically configured to receive information from the terminal, where the information includes the charging rate of the target vehicle battery and the type of the target vehicle battery.

[0097] In a feasible implementation, the determining module 402 is specifically configured to determine, from a database, a plurality of sets of relationship graphs corresponding to the type of the target vehicle battery; the plurality of sets of relationship graphs include a correspondence between the charging voltage and the remaining capacity of the same type of battery under different charging rates and a correspondence between the charging current and the remaining capacity; and the determining module 402 is specifically configured to determine, from the plurality of sets of relationship graphs, a set of relationship graphs corresponding to the charging rate of the target vehicle battery; the set of relationship graphs includes a correspondence between the charging voltage and the remaining capacity of the target vehicle battery and a correspondence between the charging current and the remaining capacity of the target vehicle battery.

[0098] In an implementable manner, the determination module 402 is specifically configured to determine, from the correspondence between the charging voltage and the residual capacity of the target vehicle battery, a residual capacity value corresponding to the terminal voltage value of the target vehicle battery; and the determination module 402 is specifically configured to determine, from the correspondence between the charging current and the residual capacity of the target vehicle battery, a charging current value corresponding to the residual capacity value.

[0099] In a specific implementation, the charging device can execute the above steps through the above modules Figure 2 The steps or methods performed by the charging device in the embodiments shown above achieve the functions achieved in the method embodiments, and specific implementation can be referred to the above Figure 2 The corresponding descriptions provided by each step in the method embodiments are not repeated here.

[0100] In the embodiments of the present application, the acquisition module 401 acquires the charging rate of the target vehicle battery and the type of the target vehicle battery from the battery management system or the terminal device of the vehicle, the determination module 402 determines the correspondence between the charging voltage and the residual capacity of the target vehicle battery and the correspondence between the charging current and the residual capacity of the target vehicle battery according to the charging rate of the target vehicle battery and the type of the target vehicle battery; the collection module 403 collects the terminal voltage value of the target vehicle battery when the battery management system is in an offline state, the determination module 402 determines the target charging current value according to the terminal voltage value of the target vehicle battery, the correspondence between the charging voltage and the residual capacity of the target vehicle battery, and the correspondence between the charging current and the residual capacity of the target vehicle battery, and the charging module 404 charges the target vehicle battery according to the target charging current value. Therefore, when the BMS is in an offline state, the current size of the charging device can be adjusted, and the charging time of the target vehicle battery can be shortened. In addition, when the BMS is in an offline state, the current size of the charging device can still be adjusted, and when the target vehicle battery is fully charged, the charging device will adjust the current size to zero or close to zero (A), that is, the charging device stops charging the target vehicle battery, which can avoid the phenomenon of overcharging of the target vehicle battery and improve the performance and life of the target vehicle battery.

[0101] Please refer to Figure 6 , Figure 6 is a structural schematic diagram of a charging device provided by an embodiment of the present application. The charging device can be the charging device in any of the above embodiments, and can be used to implement the steps of the charging method performed by the charging device described in any of the above embodiments. The charging device can include a processor 501, a memory 502, a network interface 503, and a bus system 504.

[0102] The memory 502 includes, but is not limited to, a RAM, a ROM, an EPROM or a CD-ROM, and is configured to store relevant instructions and data. The memory 502 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:

[0103] Operation instructions: include various operation instructions for implementing various operations.

[0104] Operating system: includes various system programs for implementing various basic services and processing hardware-based tasks.

[0105] Figure 6 Only one memory is shown in the figure, but the memory can also be set to multiple according to the needs.

[0106] The processor 501 can be a controller, a CPU, a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It can implement or execute various exemplary logical blocks, modules and circuits described in combination with the disclosure of the embodiments of the present application. For example, the process of collecting the terminal voltage value of the target vehicle battery by the charging device as described in Embodiment One. The processor 501 can also be a combination of computing functions, such as a combination of one or more microprocessors, a combination of DSP and microprocessor, etc.

[0107] The network interface 503 can provide network communication functions, and can optionally include standard wired interfaces, wireless interfaces (such as WI-FI interfaces). In the present application, the network interface 503 is used to perform the process of obtaining the charging rate of the target vehicle battery and the type of the target vehicle battery by the charging device from the battery management system or terminal device of the vehicle as described in Embodiment One.

[0108] In specific applications, the various components of the charging device are coupled together through the bus system 504, which can include not only a data bus, but also a power bus, a control bus and a status signal bus, etc. However, in order to clearly illustrate, all kinds of buses are marked as bus system 504 in the figure. Figure 6 For ease of representation, Figure 6 only the schematic drawing is shown.

[0109] It should be noted that in actual applications, the processor in the embodiments of the present application can be an integrated circuit chip with signal processing capability. In the implementation process, each step of the method embodiments described above can be completed by integrated logic circuits of hardware in the processor or instructions in the form of software. The processor described above can be a general processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. Each method, step and logic block diagram disclosed in the embodiments of the present application can be implemented or executed.

[0110] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically EPROM (EEPROM) or a flash memory. The volatile memory can be a random access memory (RAM) used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM) and direct rambus RAM (DR RAM). It should be noted that the memory described in the embodiments of the present application is intended to include but not limited to these and any other suitable types of memory.

[0111] The embodiments of the present application also provide a computer readable storage medium having a computer program stored thereon, which, when executed by a computer, implements the method or steps performed by the charging device in any of the above embodiments.

[0112] The embodiment of the present application further provides a computer program product, which realizes the method or the steps executed by the charging device in any of the above embodiments when executed by a computer.

[0113] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been described in general terms in the above description. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0114] In summary, the above only describes the preferred embodiments of the technical solutions of the present application, and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A charging method characterized by, The method is applied to a charging device, and the method comprises: obtaining a charging rate of a target vehicle battery and a type of the target vehicle battery from a battery management system of a vehicle; or, when the battery management system is in an offline state, sending a notification message to a terminal device, the notification message being used to notify that the battery management system of the vehicle is in the offline state and to request to obtain the charging rate of the target vehicle battery and the type of the target vehicle battery; receiving information from the terminal device, the information comprising the charging rate of the target vehicle battery and the type of the target vehicle battery; determining a corresponding relationship between a charging voltage and a remaining capacity of the target vehicle battery and a corresponding relationship between a charging current and the remaining capacity of the target vehicle battery according to the charging rate of the target vehicle battery and the type of the target vehicle battery; when the battery management system is in the offline state, collecting an end voltage value of the target vehicle battery, and determining a target charging current value according to the end voltage value of the target vehicle battery, the corresponding relationship between the charging voltage and the remaining capacity of the target vehicle battery, and the corresponding relationship between the charging current and the remaining capacity of the target vehicle battery; charging the target vehicle battery according to the target charging current value.

2. The method of claim 1, wherein, The obtaining of the charging rate of the target vehicle battery and the type of the target vehicle battery from the battery management system of the vehicle comprises: when the battery management system is in an online state, sending a query instruction to the battery management system of the vehicle, the query instruction being used to query the charging rate of the target vehicle battery and the type of the target vehicle battery; receiving a response message returned by the battery management system, the response message comprising the charging rate of the target vehicle battery and the type of the target vehicle battery.

3. The method of claim 1 or 2, wherein, The determining of the corresponding relationship between the charging voltage and the remaining capacity of the target vehicle battery and the corresponding relationship between the charging current and the remaining capacity of the target vehicle battery according to the charging rate of the target vehicle battery and the type of the target vehicle battery comprises: determining a plurality of sets of relationship graphs corresponding to the type of the target vehicle battery from a database; the plurality of sets of relationship graphs comprise corresponding relationships between charging voltages and remaining capacities of the same type of battery under different charging rates and corresponding relationships between charging currents and the remaining capacities; determining a set of relationship graphs corresponding to the charging rate of the target vehicle battery from the plurality of sets of relationship graphs; the set of relationship graphs comprise the corresponding relationship between the charging voltage and the remaining capacity of the target vehicle battery and the corresponding relationship between the charging current and the remaining capacity of the target vehicle battery.

4. The method of claim 1, wherein, The determining of the target charging current value according to the end voltage value of the target vehicle battery, the corresponding relationship between the charging voltage and the remaining capacity of the target vehicle battery, and the corresponding relationship between the charging current and the remaining capacity of the target vehicle battery comprises: determining a remaining capacity value corresponding to the end voltage value of the target vehicle battery from the corresponding relationship between the charging voltage and the remaining capacity of the target vehicle battery; determine, from the correspondence between the charging current corresponding to the target vehicle battery and the residual power, a charging current value corresponding to the residual power value; determine the charging current value as a target charging current value.

5. A charging device, characterized by comprise: an acquisition module, configured to acquire a charging rate of a target vehicle battery and a type of the target vehicle battery from a battery management system of a vehicle; alternatively, the acquisition module is further configured to, when the battery management system is in an offline state, send a notification message to a terminal device, the notification message being used to notify that the battery management system of the vehicle is in the offline state and request to acquire the charging rate of the target vehicle battery and the type of the target vehicle battery; and receive information from the terminal device, the information comprising the charging rate of the target vehicle battery and the type of the target vehicle battery; a determination module, configured to determine, according to the charging rate of the target vehicle battery and the type of the target vehicle battery, a correspondence between a charging voltage corresponding to the target vehicle battery and residual power, and a correspondence between a charging current corresponding to the target vehicle battery and the residual power; an acquisition module, configured to, when the battery management system is in the offline state, acquire an end voltage value of the target vehicle battery; the determination module is further configured to determine, according to the end voltage value of the target vehicle battery, the correspondence between the charging voltage corresponding to the target vehicle battery and the residual power, and the correspondence between the charging current corresponding to the target vehicle battery and the residual power, a target charging current value; a charging module, configured to charge the target vehicle battery according to the target charging current value.

6. The apparatus of claim 5, wherein, the acquisition module further comprises: specifically configured to, when the battery management system is in an online state, send a query instruction to the battery management system of the vehicle, the query instruction being used to query the charging rate of the target vehicle battery and the type of the target vehicle battery; specifically configured to receive a response message returned by the battery management system, the response message comprising the charging rate of the target vehicle battery and the type of the target vehicle battery.

7. A charging device, characterized by comprise: a processor, a memory, and a network interface; the processor is connected to the memory and the network interface, wherein the network interface is configured to provide a data communication function, the memory is configured to store a computer program, and the processor is configured to invoke the computer program to enable the charging device to perform the method according to any one of claims 1-4.

8. A computer-readable storage medium, characterized in that, the computer readable storage medium stores a computer program, and the processor loads and executes the computer program to enable the device having the processor to perform the method according to any one of claims 1-4.

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