Vehicle lithium battery charging method, device and electronic equipment

Abstract

The present disclosure provides a vehicle lithium battery charging method, device and electronic equipment. The method comprises: in response to a charging signal sent by a vehicle electronic control unit, issuing a closing instruction to a charging relay to enter a charging mode; and in a first charging phase after the charging mode start time, judging whether an overcurrent fault of the lithium battery occurs based on a first current threshold, wherein the lithium battery is charged at a first charging current in the first charging phase; in a second charging phase from the end of the first charging phase to the lithium battery reaching a highest charging total voltage, judging whether an overcurrent fault of the lithium battery occurs based on a second current threshold, wherein the lithium battery is charged at a second charging current in the second charging phase; and in a third charging phase from the end of the second charging phase to the lithium battery reaching a single highest voltage, judging whether an overcurrent fault of the lithium battery occurs based on a third current threshold, wherein the lithium battery is charged at a third charging current in the third charging phase, which can ensure the safety of the battery.

Description

Technical Field

[0001] This disclosure relates to the field of new energy battery technology, and in particular to a method, apparatus and electronic device for charging vehicle lithium batteries. Background Technology

[0002] Traditional industrial electric vehicles mostly use lead-acid batteries, which are charged by voltage float charging. Individual cells and temperature have little impact on the performance of lead-acid batteries. Therefore, the total voltage of the battery can be used to determine the full charge and discharge status of the battery, thus eliminating the need for interaction between the Battery Management System (BMS) and the charger.

[0003] Lithium-ion batteries are susceptible to changes in temperature and current during charging and discharging. Therefore, during lithium-ion battery charging, the Battery Management System (BMS) typically needs to communicate with the charger to actively control the charging current and report fault information. In this situation, if only the lead-acid batteries in traditional industrial electric vehicles are replaced with lithium-ion batteries while other devices such as the charger remain unchanged, a "blind charging" phenomenon will inevitably occur, where the lithium-ion battery does not communicate with the charger, thus affecting the safety of lithium-ion battery charging. Summary of the Invention

[0004] This disclosure presents a method, apparatus, and electronic device for charging a vehicle lithium battery, which aims to at least partially solve one of the technical problems in the related art.

[0005] The first aspect of this disclosure provides a method for charging a vehicle lithium battery, comprising: responding to a charging signal sent by a vehicle electronic control unit, issuing a closing command to a charging relay to enter a charging mode; in a first charging stage after the start time of the charging mode, determining whether an overcurrent fault has occurred in the lithium battery based on a first current threshold, wherein the lithium battery is charged with a first charging current in the first charging stage, the first charging current being the charging current at the lowest applicable ambient temperature; in a second charging stage from the end of the first charging stage to the lithium battery reaching its maximum total charging voltage, determining whether an overcurrent fault has occurred in the lithium battery based on a second current threshold, wherein the lithium battery is charged with a second charging current in the second charging stage, the second charging current being the maximum allowable charging current within a preset temperature range; and in a third charging stage from the end of the second charging stage to the lithium battery reaching its highest single-cell voltage, determining whether an overcurrent fault has occurred in the lithium battery based on a third current threshold, wherein the lithium battery is charged with a third charging current in the third charging stage, the third charging current being a preset constant current.

[0006] A second aspect of this disclosure provides a vehicle lithium battery charging device, comprising: a response module for issuing a closing command to a charging relay to enter a charging mode in response to a charging signal sent by a vehicle electronic control unit; a first charging module for determining whether an overcurrent fault has occurred in the lithium battery based on a first current threshold during a first charging phase after the start time of the charging mode, wherein the lithium battery is charged with a first charging current during the first charging phase, the first charging current being the charging current at the lowest applicable ambient temperature; a second charging module for determining whether an overcurrent fault has occurred in the lithium battery based on a second current threshold during a second charging phase from the end of the first charging phase to the lithium battery reaching its maximum total charging voltage, wherein the lithium battery is charged with a second charging current during the second charging phase, the second charging current being the maximum allowable charging current within a preset temperature range; and a third charging module for determining whether an overcurrent fault has occurred in the lithium battery based on a third current threshold during a third charging phase from the end of the second charging phase to the lithium battery reaching its highest single-cell voltage, wherein the lithium battery is charged with a third charging current during the third charging phase, the third charging current being a preset constant current.

[0007] A third aspect of this disclosure provides an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform a vehicle lithium battery charging method according to an embodiment of this disclosure.

[0008] A fourth aspect of this disclosure provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute a vehicle lithium battery charging method disclosed in this disclosure.

[0009] In this embodiment, in response to a charging signal sent by the vehicle's electronic control unit, a closing command is issued to the charging relay to enter the charging mode. During the first charging stage after the charging mode start time, an overcurrent fault is detected in the lithium battery based on a first current threshold. The lithium battery is charged with a first charging current at the lowest applicable ambient temperature during this first charging stage. During the second charging stage, from the end of the first charging stage until the lithium battery reaches its maximum total charging voltage, an overcurrent fault is detected based on a second current threshold. During this second charging stage, the lithium battery is charged with a second charging current, which is the maximum allowable charging current within a preset temperature range. During the third charging stage, from the end of the second charging stage until the lithium battery reaches its highest single-cell voltage, an overcurrent fault is detected based on a third current threshold. During this third charging stage, the lithium battery is charged with a third charging current, which is a preset constant current. This allows for multi-stage charging of the lithium battery using different charging currents without communication between the lithium battery and the charger, ensuring battery safety and enabling overcurrent fault detection during the charging process.

[0010] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0011] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0012] Figure 1 This is a schematic flowchart of a vehicle lithium battery charging method according to an embodiment of the present disclosure;

[0013] Figure 2 This is a schematic diagram of a vehicle lithium battery charging system provided according to an embodiment of the present disclosure;

[0014] Figure 3 This is a schematic diagram of the relationship between temperature and remaining power charge according to the embodiments of this disclosure;

[0015] Figure 4 This is a schematic diagram of the overall process of vehicle lithium battery charging and fault detection according to the embodiments of this disclosure;

[0016] Figure 5 This is a schematic diagram of a vehicle lithium battery charging device according to another embodiment of the present disclosure;

[0017] Figure 6 A block diagram of an exemplary electronic device suitable for implementing embodiments of the present disclosure is shown. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0019] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0020] It should be noted that the vehicle lithium battery charging method in this embodiment can be executed by a vehicle lithium battery charging device, which can be implemented by software and / or hardware. The device can be configured in an electronic device, which may include, but is not limited to, a terminal, a server, etc.

[0021] Figure 1 This is a schematic flowchart of a vehicle lithium battery charging method according to an embodiment of the present disclosure, as shown below. Figure 1 As shown, the method includes:

[0022] S101: In response to the charging signal sent by the vehicle's electronic control unit, a closing command is sent to the charging relay to enter the charging mode.

[0023] As described in the background section, the vehicle in this embodiment is an electric vehicle that uses a lithium battery instead of a lead-acid battery. Figure 2 This is a schematic diagram of a vehicle lithium battery charging system provided according to an embodiment of this disclosure, such as... Figure 2 As shown, the vehicle's lithium battery charging system includes a battery pack B1 (i.e., the lithium battery pack), a discharge switch K1 (also known as a discharge relay), and a charging switch K2 (also known as a charging relay). All of these switches are controlled by the Battery Management System (BMS), which can detect information such as the lithium battery's voltage and temperature. Furthermore, the BMS communicates with the vehicle's core electronic control unit (VCU) to exchange battery information and adjust vehicle operations based on this information. Additionally, as... Figure 2 As shown, the battery charging system also includes a battery charging socket Z1, a battery charging plug Z4, a brush plate stabilization motor M1, a vehicle-end brush plate Z2, a charger-end brush plate Z3, a charger C1, a position switch T (including the position switch body Ta and the position switch contact Tb) set on the vehicle-end brush plate Z2, and any other possible devices. The vehicle-end brush plate Z2 and the charger-end brush plate Z3 are made of highly conductive copper. When the position switch contact Tb is not compressed, that is, in its natural state, the position switch T is in the open state. After the brush plate is in position, the contact switch retracts into the body, and the switch T is in the closed state.

[0024] During actual charging, when the vehicle's battery is depleted, for example, when the remaining SOC of the lithium battery is below a certain value (e.g., 30%), it needs to enter charging mode. In this case, the vehicle automatically moves to the designated charging position according to the program. The VCU controls Z2 and Z3 to engage, T closes, and the switch signal is connected to the VCU and detected by the VCU. At this time, the electronic control unit (VCU) issues a command to activate the stabilization motor M1 to maintain the tight connection of the brush plates for conductivity. The engagement of Z2 and Z3 requires the stabilization motor to maintain this connection. This power is supplied through the rear interface of the discharge switch K1. Moreover, the power supply of the entire vehicle's VCU also comes from the vehicle's lithium battery. Therefore, the discharge relay must be in the closed state during charging.

[0025] Furthermore, the vehicle electronic control unit (VCU) sends a charging signal (or charging command) to the battery management system (BMS) via the vehicle CAN bus. In this case, the battery management system (BMS) can respond to the charging signal by sending a closing command to the charging relay K2 to control the charging relay K2 to close, thereby entering the charging mode. That is to say, the vehicle lithium battery charging method in this embodiment can be executed by the battery management system (BMS).

[0026] S102: In the first charging phase after the start time of the charging mode, determine whether the lithium battery has an overcurrent fault based on the first current threshold.

[0027] After entering charging mode, since only lithium batteries are used to replace lead-acid batteries, there is no communication between the battery management system (BMS) and the charger. Therefore, the BMS cannot control the charging current, i.e., blind charging.

[0028] Therefore, to ensure the safe charging of lithium batteries under a reasonable current, embodiments of this disclosure can include multiple charging stages, such as a first charging stage, a second charging stage, a third charging stage, etc., and the charging current for each charging stage can be pre-set on the charger side. Some embodiments... Figure 3 This is a schematic diagram of the structure of the charging current relationship table corresponding to temperature and remaining power provided in the embodiments of this disclosure, as shown below. Figure 3 As shown, in this embodiment, a relationship table (battery MAP table) corresponding to different temperatures and remaining charge (SOC) can be pre-configured according to the experimental method. When determining the charging current for each charging stage, it can be determined based on the battery MAP table.

[0029] In this embodiment, after entering the charging mode, the lithium battery first begins the first charging stage, meaning the start time of the first charging stage is the charging mode start time. Normally, the Battery Management System (BMS) issues a closing command to the charging relay to determine entry into the charging mode. The time of issuing the closing command can be called the first issuance time, i.e., the first issuance time is used as the charging mode start time. However, in practical applications, due to the rebound phenomenon of the charging relay during the closing process, there is a delay from the issuance of the closing command to the stabilization of the charging relay contacts. This delay duration can be called the first delay duration. According to relay testing results, this delay is within 50 milliseconds. Therefore, in this embodiment, the first delay duration can be set to 50 milliseconds. In this case, when determining the charging mode start time, the first issuance time of the closing command is first determined, and then the charging mode start time is determined based on the first issuance time and the first delay duration. That is, the first delay duration is accumulated on the first issuance time to serve as the charging mode start time. Therefore, delaying the entry into the charging mode can improve operational stability.

[0030] The charging current used by the lithium battery in the first charging stage can be referred to as the first charging current (initial charging current), which can be represented by I1. That is to say, the first charging current I1 can be determined based on the battery MAP table. Considering that I1 is the initial charging current, in order to ensure charging safety, this embodiment can use the charging current of the vehicle at the lowest application ambient temperature as the first charging current. It is understood that using this first charging current has a relatively small impact on the temperature change of the lithium battery.

[0031] For example, in this embodiment, the vehicle's application environment is indoors, with a minimum operating temperature of 10 degrees Celsius, and the vehicle's remaining current SOC is 30%, requiring charging. In this case, the first charging current used by the charger to charge the lithium battery in the first charging phase can be determined to be 0.5C based on the battery MAP table. Furthermore, this embodiment can also configure the charging time of the first charging phase as T1. In some embodiments, this charging time T1 is, for example, the time it takes for the temperature of the lithium battery to rise from 10 degrees Celsius to 15 degrees Celsius while charging with the first charging current, which can be experimentally measured. That is, the battery management system (BMS) can determine that within a time period T1 after the start of the charging mode (i.e., the first charging phase), the charger charges with the first charging current (0.5C).

[0032] Furthermore, the battery management system (BMS) of this embodiment can also perform charging fault detection during the first charging stage, such as overcurrent fault detection. Specifically, this embodiment can pre-set a current threshold for the first charging stage, which can be referred to as the first current threshold. During the first charging stage, the battery management system (BMS) can compare the actual charging current with the first current threshold to determine whether an overcurrent fault has occurred. That is, if the actual charging current exceeds the first current threshold, it can be determined as an overcurrent fault.

[0033] In some embodiments, the first current threshold can be determined based on the first charging current. For example, the first current threshold is 1.2 times the first charging current, and the allowable time error for fault detection in the first charging stage is ±2%. This ensures that the charging range is adapted to 1.2 times the application current and provides charging safety during blind charging.

[0034] S103: In the second charging stage, from the end of the first charging stage to the lithium battery reaching the maximum total charging voltage, determine whether the lithium battery has experienced an overcurrent fault based on the second current threshold.

[0035] The maximum total charging voltage of a lithium battery can be represented by U1, which is 3.85V * the number of lithium batteries in series. Before reaching the maximum total charging voltage U1, no single cell of the lithium battery will reach the maximum cutoff voltage of 3.65V.

[0036] The period from the end of the first charging stage to the lithium battery reaching its maximum total charging voltage U1 can be referred to as the second charging stage. The charging current used by the lithium battery in the second charging stage can be called the second charging current, which can be represented by I2. That is to say, from the end of the first charging stage to the lithium battery reaching its maximum total charging voltage U1, the charger charges the lithium battery with the second charging current I2. It is understood that after the first charging stage ends, the lithium battery temperature reaches about 15 degrees Celsius, which is the normal operating temperature. In this case, in order to shorten the charging time as much as possible, this embodiment can select the maximum allowable charging current within the normal charging temperature range of the lithium battery as the second charging current I2. In some embodiments, this temperature range is, for example, 15°C-55°C. In practical applications, the maximum allowable charging current within 15°C-55°C is, for example, 0.9C. That is to say, the second charging stage is charged at 0.9C until the lithium battery reaches its maximum total charging voltage U1.

[0037] Similarly, the battery management system (BMS) of this embodiment can also perform charging fault detection during the second charging stage, such as overcurrent fault detection. Specifically, this embodiment can pre-set a current threshold for the second charging stage, which can be referred to as the second current threshold. During the second charging stage, the BMS can compare the actual charging current with the second current threshold to determine whether an overcurrent fault has occurred. The second current threshold can be determined based on the second charging current; for example, the second current threshold is 1.2 times the second charging current I2.

[0038] S104: In the third charging stage, from the end of the second charging stage to when the lithium battery reaches its highest single-cell voltage, determine whether the lithium battery has experienced an overcurrent fault based on the third current threshold.

[0039] The third charging stage refers to the period from the end of the second charging stage to when the lithium battery reaches its maximum single-cell voltage. Reaching the maximum single-cell voltage (3.65V) indicates that the lithium battery is fully charged. The charging current used in this third charging stage is called the third charging current, denoted by I3. This means that from the maximum total charging voltage until the lithium battery is fully charged, the charger uses the third charging current I3. The third charging current I3 is a preset constant current; for example, if I3 is 0.1C, it means that the battery is charged at 0.1C during the third charging stage until it is fully charged.

[0040] Similarly, the battery management system (BMS) of this embodiment can also perform charging fault detection, such as overcurrent fault detection, during the third charging stage. Specifically, this embodiment can pre-set a current threshold for the third charging stage, which can be referred to as the third current threshold. During the third charging stage, the BMS can compare the actual charging current with this third current threshold to determine whether an overcurrent fault has occurred. The third current threshold can be determined based on the third charging current; for example, the third current threshold is 1.2 times the third charging current I2.

[0041] In some embodiments, after the third charging stage ends (i.e., the lithium battery is fully charged), the Battery Management System (BMS) sends a disconnect command to the charging relay and determines the timing of the disconnect command. This timing can be referred to as the second disconnect time. In practical applications, the charging relay can de-energize the charging coil upon receiving the disconnect command. However, due to the inductive characteristics of the magnetic inductance coil, the magnetic force of the coil also needs some time to dissipate when the charging relay disconnects. Therefore, there is a certain delay from the start of disconnection to the complete disappearance of the electromagnetic field. This delay can be referred to as the second delay duration. According to experiments, this second delay duration is generally 50 milliseconds. Furthermore, this embodiment can determine the discharge mode start time based on the second disconnect time and the second delay duration. That is, the time obtained by adding the second delay duration to the second disconnect time is used as the discharge mode start time. Thus, delaying the entry into the discharge mode can improve operational stability.

[0042] In other embodiments, after entering discharge mode, the lithium battery voltage will briefly reach its maximum voltage of 3.65V, which is typically considered a level two fault in discharge mode. In this case, this embodiment can set a certain delay, the duration of which can be called the third delay duration. Experiments show that the 3.65V duration during discharge is 5 seconds; therefore, the third delay duration in this embodiment is 5 seconds. Thus, this embodiment can determine the discharge fault detection start time based on the discharge mode start time and the third delay duration. Specifically, it adds the third delay duration to the discharge mode start time and uses this added time as the discharge fault detection start time. Therefore, even if the voltage is still at 3.65V after switching to discharge mode, a fault cannot be triggered, thus avoiding faults during switching and improving the rationality of fault detection.

[0043] In this embodiment, in response to a charging signal sent by the vehicle's electronic control unit, a closing command is issued to the charging relay to enter the charging mode. During the first charging stage after the charging mode start time, an overcurrent fault is detected in the lithium battery based on a first current threshold. The lithium battery is charged with a first charging current at the lowest applicable ambient temperature during this first charging stage. During the second charging stage, from the end of the first charging stage until the lithium battery reaches its maximum total charging voltage, an overcurrent fault is detected based on a second current threshold. During this second charging stage, the lithium battery is charged with a second charging current, which is the maximum allowable charging current within a preset temperature range. During the third charging stage, from the end of the second charging stage until the lithium battery reaches its highest single-cell voltage, an overcurrent fault is detected based on a third current threshold. During this third charging stage, the lithium battery is charged with a third charging current, which is a preset constant current. This allows for multi-stage charging of the lithium battery using different charging currents without communication between the lithium battery and the charger, ensuring battery safety and enabling overcurrent fault detection during the charging process.

[0044] In a specific instance Figure 4 This is a schematic diagram of the overall process for vehicle lithium battery charging and fault detection according to embodiments of this disclosure, as shown below. Figure 4 As shown, during the vehicle lithium battery charging and fault detection process, the vehicle sends a signal to the charger location and simultaneously sends a charging start signal to the BMS. The BMS enters charging mode, with a 50-millisecond delay based on relay bounce theory. Once the BMS completes charging mode (i.e., charging mode is active), a charging flag can be set, and all faults are entered into the charging fault judgment process. Stage 1 (first charging stage): I1 current charges for T1. Stage 2 (second charging stage): I2 current charges until the total voltage reaches U1. Stage 3 (third charging stage): I3 current charges until fully charged to 3.65V. A full charge flag is reported on the vehicle's CAN bus, the charging relay coil is de-energized, and 3.65V is set to SOC 100%. The system then switches to discharge mode, with a 50-millisecond delay based on relay bounce theory. Switching to discharge mode is indicated by the relay completely disconnecting. After switching, all faults are judged in discharge mode. 3.65V is also a level 2 discharge fault, with a 5-second delay.

[0045] To achieve the above embodiments, this disclosure also proposes a vehicle lithium battery charging device.

[0046] Figure 5 This is a schematic diagram of a vehicle lithium battery charging device according to another embodiment of the present disclosure.

[0047] like Figure 5 As shown, the vehicle lithium battery charging device 80 includes:

[0048] The response module 501 is used to respond to the charging signal sent by the vehicle electronic control unit and send a closing command to the charging relay to enter the charging mode.

[0049] The first charging module 502 is used to determine whether the lithium battery has an overcurrent fault based on a first current threshold during the first charging stage after the charging mode start time. The lithium battery is charged with a first charging current during the first charging stage, and the first charging current is the charging current at the lowest application ambient temperature.

[0050] The second charging module 503 is used to determine whether the lithium battery has an overcurrent fault based on a second current threshold during the second charging stage from the end of the first charging stage to the lithium battery reaching the highest total charging voltage. The lithium battery is charged with a second charging current during the second charging stage, and the second charging current is the maximum charging current allowed within a preset temperature range.

[0051] The third charging module 504 is used to determine whether the lithium battery has an overcurrent fault based on a third current threshold during the third charging stage, from the end of the second charging stage to the lithium battery reaching the highest voltage of a single cell. The lithium battery is charged with a third charging current during the third charging stage, and the third charging current is a preset constant current.

[0052] In some embodiments, the device 50 further includes: a first determining module for determining a first issuance time of a closing command; and a second determining module for determining a charging mode start time based on the first issuance time and a first delay duration.

[0053] In some embodiments, the device 50 further includes: a third determining module, configured to send a disconnect command to the charging relay and determine a second sending time after the third charging phase ends; and a fourth determining module, configured to determine the discharge mode start time based on the second sending time and a second delay duration.

[0054] In some embodiments, the device 50 further includes a fifth determining module, configured to determine the discharge fault detection start time based on the discharge mode start time and the third delay duration.

[0055] In some embodiments, the device 50 further includes a sixth determining module, specifically configured to: determine a first current threshold based on a first charging current, wherein the first current threshold is 1.2 times the first charging current; determine a second current threshold based on a second charging current, wherein the second current threshold is 1.2 times the second charging current; and determine a third current threshold based on a third charging current, wherein the third current threshold is 1.2 times the third charging current.

[0056] In this embodiment, in response to a charging signal sent by the vehicle's electronic control unit, a closing command is issued to the charging relay to enter the charging mode. During the first charging stage after the charging mode start time, an overcurrent fault is detected in the lithium battery based on a first current threshold. The lithium battery is charged with a first charging current at the lowest applicable ambient temperature during this first charging stage. During the second charging stage, from the end of the first charging stage until the lithium battery reaches its maximum total charging voltage, an overcurrent fault is detected based on a second current threshold. During this second charging stage, the lithium battery is charged with a second charging current, which is the maximum allowable charging current within a preset temperature range. During the third charging stage, from the end of the second charging stage until the lithium battery reaches its highest single-cell voltage, an overcurrent fault is detected based on a third current threshold. During this third charging stage, the lithium battery is charged with a third charging current, which is a preset constant current. This allows for multi-stage charging of the lithium battery using different charging currents without communication between the lithium battery and the charger, ensuring battery safety and enabling overcurrent fault detection during the charging process.

[0057] According to embodiments of this disclosure, this disclosure also provides an electronic device, a readable storage medium, and a computer program product.

[0058] To implement the above embodiments, this disclosure also proposes a computer program product that, when executed by an instruction processor, performs a vehicle lithium battery charging method as described in the foregoing embodiments of this disclosure.

[0059] Figure 6 A block diagram of an exemplary electronic device suitable for implementing embodiments of the present disclosure is shown. Figure 6 The electronic device 12 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments disclosed herein.

[0060] like Figure 6 As shown, the electronic device 12 is represented in the form of a general-purpose computing device. The components of the electronic device 12 may include, but are not limited to: one or more processors or processing units 16, system memory 28, and bus 18 connecting different system components (including system memory 28 and processing unit 16).

[0061] Bus 18 represents one or more of several bus architectures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus architectures. Examples of these architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnect (PCI) bus.

[0062] Electronic device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by electronic device 12, including volatile and non-volatile media, removable and non-removable media.

[0063] Memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM) 30 and / or cache memory 32. Electronic device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 34 may be used to read and write non-removable, non-volatile magnetic media (… Figure 6 Not shown; usually referred to as a "hard drive".

[0064] although Figure 6 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk") and an optical disc drive for reading and writing to a removable non-volatile optical disc (e.g., a compact disc read-only memory (CD-ROM), a digital video disc read-only memory (DVD-ROM), or other optical media) may be provided. In these cases, each drive may be connected to bus 18 via one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of this disclosure.

[0065] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28. Such program modules 42 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. Program modules 42 typically perform the functions and / or methods described in the embodiments of this disclosure.

[0066] Electronic device 12 can also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), and with one or more devices that enable a user to interact with electronic device 12, and / or with any device that enables electronic device 12 to communicate with one or more other computing devices (e.g., network card, modem, etc.). This communication can be performed via input / output (I / O) interface 22. Furthermore, electronic device 12 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 20. As shown, network adapter 20 communicates with other modules of electronic device 12 via bus 18. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with electronic device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0067] The processing unit 16 executes various functional applications by running programs stored in the system memory 28, such as implementing the vehicle lithium battery charging method mentioned in the foregoing embodiments.

[0068] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0069] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

[0070] It should be noted that in the description of this disclosure, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0071] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.

[0072] It should be understood that various parts of this disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0073] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0074] Furthermore, the functional units in the various embodiments of this disclosure can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0075] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0076] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0077] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A method for charging a vehicle lithium battery, characterized in that, The method includes: In response to the charging signal sent by the vehicle's electronic control unit, a closing command is sent to the charging relay to enter the charging mode; In the first charging phase after the start time of the charging mode, it is determined whether the lithium battery has an overcurrent fault based on a first current threshold, wherein the lithium battery is charged with a first charging current in the first charging phase, and the first charging current is the charging current at the lowest application ambient temperature. In the second charging stage, from the end of the first charging stage to the lithium battery reaching the highest total charging voltage, it is determined whether the lithium battery has an overcurrent fault based on a second current threshold. The lithium battery is charged with a second charging current in the second charging stage, and the second charging current is the maximum charging current allowed within a preset temperature range. In the third charging stage, from the end of the second charging stage to the point where the lithium battery reaches its highest single-cell voltage, an overcurrent fault is determined based on a third current threshold. The lithium battery is charged with a third charging current in the third charging stage, and the third charging current is a preset constant current.

2. The method as described in claim 1, characterized in that, In the first charging phase after the start time of the charging mode, before determining whether the lithium battery has experienced an overcurrent fault based on a first current threshold, the method further includes: Determine the first issuance time of the closing instruction; and The start time of the charging mode is determined based on the first issuance time and the first delay duration.

3. The method as described in claim 1, characterized in that, After determining whether the lithium battery has experienced an overcurrent fault based on a third current threshold, the method further includes: After the third charging phase is completed, a disconnect command is sent to the charging relay and a second sending time is determined; and The discharge mode start time is determined based on the second transmission time and the second delay duration.

4. The method as described in claim 3, characterized in that, After determining the start time of the discharge mode, the method further includes: The discharge fault detection start time is determined based on the discharge mode start time and the third delay duration.

5. The method as described in claim 1, characterized in that, The method further includes: The first current threshold is determined based on the first charging current, wherein the first current threshold is 1.2 times the first charging current; The second current threshold is determined based on the second charging current, wherein the second current threshold is 1.2 times the second charging current; and The third current threshold is determined based on the third charging current, wherein the third current threshold is 1.2 times the third charging current.

6. A vehicle lithium battery charging device, characterized in that, include: The response module is used to respond to the charging signal sent by the vehicle's electronic control unit and send a closing command to the charging relay to enter the charging mode; The first charging module is used to determine whether the lithium battery has an overcurrent fault based on a first current threshold during the first charging phase after the charging mode start time. The lithium battery is charged with a first charging current during the first charging phase, and the first charging current is the charging current at the lowest application ambient temperature. The second charging module is used to determine whether the lithium battery has an overcurrent fault based on a second current threshold during the second charging stage from the end of the first charging stage to the point where the lithium battery reaches its maximum total charging voltage. The lithium battery is charged with a second charging current during the second charging stage, and the second charging current is the maximum charging current allowed within a preset temperature range. The third charging module is used to determine whether the lithium battery has an overcurrent fault based on a third current threshold during the third charging stage from the end of the second charging stage to the point where the lithium battery reaches its highest single-cell voltage. The lithium battery is charged with a third charging current during the third charging stage, and the third charging current is a preset constant current.

7. The apparatus as claimed in claim 6, characterized in that, The device further includes: The first determining module is used to determine the first issuance time of the closing instruction; and The second determining module is used to determine the start time of the charging mode based on the first sending time and the first delay duration.

8. The apparatus as claimed in claim 6, characterized in that, The device further includes: The third determining module is used to send a disconnect command to the charging relay after the third charging phase ends and determine the second sending time; and The fourth determining module is used to determine the discharge mode start time based on the second sending time and the second delay duration.

9. The apparatus as claimed in claim 8, characterized in that, The device further includes: The fifth determining module is used to determine the discharge fault detection start time based on the discharge mode start time and the third delay duration.

10. A non-transitory computer-readable storage medium storing computer instructions, wherein, The computer instructions are used to cause the computer to perform the method according to any one of claims 1-5.

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