Battery charging method and device, vehicle and storage medium

Abstract

The application relates to the field of vehicles, in particular to a battery charging method and device, a vehicle and a storage medium. The method comprises the following steps: collecting a current voltage of a target battery; determining a target voltage interval in which the current voltage is located, and determining a current charging mode of the target battery according to the target voltage interval; and in the case that the current charging mode is a preset low-voltage power compensation mode or a preset extreme power shortage mode, charging the target battery according to a power compensation strategy corresponding to the current charging mode. Thus, the problems that the related art lacks emergency power compensation capability, the anti-interference capability is insufficient, and the battery polarization damage is easily caused to affect the service life of the battery are solved, and the practicability and the universality are significantly improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a battery charging method, apparatus, vehicle, and storage medium. Background Technology

[0002] Long-term idling of new energy vehicles can easily cause deep discharge of low-voltage batteries, making the vehicle unable to be woken up and powered on.

[0003] In related technologies, the high-voltage power supply of the vehicle is reverse-stepped to charge the battery, and the battery is charged by a DC / DC (Direct Current-Direct Current) converter based on the high-voltage bus of the vehicle.

[0004] However, since the relevant technologies only operate under the premise that the battery has sufficient remaining power and the controller can be woken up normally, they lack emergency power replenishment capabilities, have insufficient anti-interference capabilities, and are prone to battery polarization damage, which in turn affects battery life. These problems urgently need to be solved. Summary of the Invention

[0005] This application provides a battery charging method, apparatus, vehicle, and storage medium to solve the problems of lack of emergency power replenishment capability, insufficient anti-interference capability, and easy occurrence of battery polarization damage that affects battery life in related technologies, thereby significantly improving practicality and versatility.

[0006] To achieve the above objectives, the first aspect of this application proposes a battery charging method, comprising the following steps: Collect the current voltage of the target battery; Determine the target voltage range in which the current voltage is located, and determine the current charging mode of the target battery based on the target voltage range; When the current charging mode is a preset low-voltage charging mode or a preset extreme power depletion mode, the target battery is charged according to the charging strategy corresponding to the current charging mode.

[0007] According to one embodiment of this application, before charging the target battery, the method further includes: In response to the voltage change rate of the target battery being less than or equal to a preset change rate, the type of battery depletion is determined to be static depletion. In response to the voltage change rate being greater than the preset change rate, the power loss type is determined to be leakage power loss.

[0008] According to one embodiment of this application, after determining that the power loss type is leakage power loss, the method further includes: The leakage load branch and leakage current value are determined based on at least one branch current of the target battery. Based on the leakage load branch and the leakage current value, an early warning message is generated and sent to a preset mobile terminal.

[0009] According to one embodiment of this application, determining the current charging mode of a target battery based on a target voltage range includes: The target voltage range is the first range, and the current charging mode is the preset low-voltage charging mode. The target voltage range is the second range, and the current charging mode is the preset extreme power depletion mode; The upper limit of the second interval is less than the lower limit of the first interval.

[0010] According to one embodiment of this application, when the current charging mode is the preset low-voltage charging mode, charging the target battery according to the charging strategy corresponding to the current charging mode includes: The high-voltage main relay of the target battery is kept in the off state. The target battery is charged using an external charging device.

[0011] According to one embodiment of this application, when the current charging mode is a preset extreme power depletion mode, the target battery is charged according to the power replenishment strategy corresponding to the current charging mode, including: The target battery is charged using a preset auxiliary power source; When the voltage of the target battery after charging is greater than or equal to the preset voltage, the target battery is charged through the preset main power supply.

[0012] According to one embodiment of this application, when charging the target battery according to the power replenishment strategy corresponding to the current charging mode, the method further includes: When the temperature of the target battery is greater than a first temperature or the temperature of the current on-board charger is greater than a second temperature, the target battery is charged with reduced current or charging is paused.

[0013] The battery charging method proposed in this application determines the current charging mode of the battery based on the current voltage range. When the charging mode is a preset low-voltage replenishment mode or a preset extreme power depletion mode, the target battery is charged according to the corresponding replenishment strategy. This solves the problems of lack of emergency replenishment capability, insufficient anti-interference capability, and susceptibility to battery polarization damage that affects battery life in related technologies, significantly improving practicality and versatility.

[0014] To achieve the above objectives, a second aspect of this application provides a battery charging device, comprising: The data acquisition module collects the current voltage of the target battery. The determination module determines the target voltage range in which the current voltage is located, and determines the current charging mode of the target battery based on the target voltage range; The charging module, when the current charging mode is a preset low-voltage charging mode or a preset extreme power depletion mode, charges the target battery according to the charging strategy corresponding to the current charging mode.

[0015] According to one embodiment of this application, before charging the target battery, the charging module is further configured to: In response to the voltage change rate of the target battery being less than or equal to a preset change rate, the type of battery depletion is determined to be static depletion. In response to the voltage change rate being greater than the preset change rate, the power loss type is determined to be leakage power loss.

[0016] According to one embodiment of this application, after determining that the power loss type is leakage power loss, the charging module is further configured to: The leakage load branch and leakage current value are determined based on at least one branch current of the target battery. Based on the leakage load branch and the leakage current value, an early warning message is generated and sent to a preset mobile terminal.

[0017] According to one embodiment of this application, the determining module is specifically used for: The target voltage range is the first range, and the current charging mode is the preset low-voltage charging mode. The target voltage range is the second range, and the current charging mode is the preset extreme power depletion mode; The upper limit of the second interval is less than the lower limit of the first interval.

[0018] According to one embodiment of this application, when the current charging mode is the preset low-voltage charging mode, the charging module is specifically used for: The high-voltage main relay of the target battery is kept in the off state. The target battery is charged using an external charging device.

[0019] According to one embodiment of this application, when the current charging mode is a preset extreme power depletion mode, the charging module is specifically used for: The target battery is charged using a preset auxiliary power source; When the voltage of the target battery after charging is greater than or equal to the preset voltage, the target battery is charged through the preset main power supply.

[0020] According to one embodiment of this application, when charging the target battery according to the power replenishment strategy corresponding to the current charging mode, the charging module is further configured to: When the temperature of the target battery is greater than a first temperature or the temperature of the current on-board charger is greater than a second temperature, the target battery is charged with reduced current or charging is paused.

[0021] The battery charging device proposed in this application determines the current charging mode of the battery based on the current voltage range of the battery. When the charging mode is a preset low-voltage replenishment mode or a preset extreme power depletion mode, the target battery is charged according to the corresponding replenishment strategy. This solves the problems of lack of emergency replenishment capability, insufficient anti-interference capability, and susceptibility to battery polarization damage that affects battery life in related technologies, significantly improving practicality and versatility.

[0022] To achieve the above objectives, a third aspect of this application provides a vehicle comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the battery charging method as described in the above embodiments.

[0023] To achieve the above objectives, a fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the battery charging method as described in the above embodiments.

[0024] To achieve the above objectives, a fifth aspect of this application provides a computer program product, which, when executed by a processor, implements the battery charging method as described in the above embodiments.

[0025] Additional aspects and advantages of this application 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 application. Attached Figure Description

[0026] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a battery charging method provided according to an embodiment of this application; Figure 2 This is a schematic diagram of a charging curve for a multi-stage charging strategy provided according to an embodiment of this application. Figure 3 This is a flowchart of a charging method under a preset extreme power depletion mode according to an embodiment of this application; Figure 4 A flowchart of a battery charging method according to an embodiment of this application; Figure 5 This is a block diagram of a battery charging device provided according to an embodiment of this application; Figure 6 This is a structural schematic diagram of a vehicle provided according to an embodiment of this application. Detailed Implementation

[0027] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0028] The following description, with reference to the accompanying drawings, outlines a battery charging method, apparatus, vehicle, and storage medium according to embodiments of this application.

[0029] Before introducing the battery charging method of the embodiments of this application, we will first introduce the battery charging method in the related art.

[0030] With the increasing popularity of new energy vehicles, the problem of low-voltage battery depletion caused by prolonged vehicle parking is becoming increasingly prominent. When the low-voltage battery (usually a 12V lead-acid battery or a 12V lithium battery) is severely depleted, the vehicle controller cannot be properly activated, and the vehicle cannot be started with high-voltage electricity. Users often need to jump-start the vehicle or replace the battery to solve the problem, which seriously affects the user experience.

[0031] On the one hand, the relevant technologies adopt a split architecture of "on-board charger + independent external DC-DC converter", which clearly discloses that the on-board charger is powered by an independent DC-DC converter and the DC-DC converter charges the low-voltage battery. Its core is to achieve conventional low-voltage charging through a split hardware architecture. It does not have a deep power loss auxiliary start-up mechanism, cannot solve the problem of power replenishment for controller failure, and has no leakage current identification or parameter adaptive adjustment function. It can only achieve basic charging.

[0032] On the other hand, the related technologies have solved the problem that the vehicle controller cannot be woken up and the vehicle cannot start charging due to the deep discharge of the low-voltage battery in electric vehicles. However, the related technologies wake up the controller based on the residual voltage of the battery, which completely fails when the battery is deeply discharged. The charging requires interaction with the high-voltage system and the power battery. The charging strategy is fixed and does not take into account the thermal management coordination of the integrated on-board charger. Furthermore, there is no leakage current location, charging parameter self-learning, or CP (Control Pilot) auxiliary power supply voltage stabilization and filtering design. Therefore, it cannot be adapted to the scenario of dual discharge of the power battery and the low-voltage battery, and it cannot avoid secondary damage to the battery.

[0033] Based on the aforementioned problems, this application provides a battery charging method that is independent of vehicle control and high-voltage circuits, features hardware self-starting, and can self-rescue from deep battery depletion. The method determines the battery's current charging mode based on its current voltage range. When the charging mode is a preset low-voltage charging mode or a preset extreme battery depletion mode, the target battery is charged according to the corresponding charging strategy. This solves the problems of lack of emergency charging capability, insufficient anti-interference capability, and susceptibility to battery polarization damage that affects battery life in related technologies, significantly improving practicality and versatility.

[0034] Specifically, Figure 1 This is a flowchart of a battery charging method according to an embodiment of this application.

[0035] like Figure 1 As shown, the battery charging method includes the following steps: In step S101, the current voltage of the target battery is acquired.

[0036] Specifically, this application embodiment includes a wake-up control module that enters low-power sleep mode when the vehicle is powered off and stationary, and is woken up by a timer at a preset period. After being woken up, the wake-up control module collects the current voltage of the target battery. and the current voltage of the target battery Noise is filtered out through pre-processing to ensure accurate parameters.

[0037] In step S102, the target voltage range in which the current voltage is located is determined, and the current charging mode of the target battery is determined based on the target voltage range.

[0038] Optionally, in some embodiments, determining the current charging mode of the target battery based on the target voltage range includes: the target voltage range being a first range and the current charging mode being a preset low-voltage charging mode; or the target voltage range being a second range and the current charging mode being a preset extreme depletion mode, wherein the upper limit of the second range is less than the lower limit of the first range.

[0039] The target voltage range refers to a predefined range of values ​​with the battery voltage as the boundary. The first and second ranges can be ranges preset by the user, ranges obtained through a limited number of experiments, or ranges obtained through a limited number of computer simulations.

[0040] Specifically, this application embodiment sets three voltage thresholds: , and The current charging mode of the target battery is determined based on the current voltage obtained in step S101. For example, a 12V lead-acid battery. =11.8V (room temperature) =5V =9.5V; Lithium battery =12.5V (normal temperature), =5V =10.0V; Adjusted by ±0.1V every 10℃ with temperature.

[0041] Furthermore, when the current voltage is greater than or equal to When the battery is fully charged, the control module is awakened and returns to sleep mode; when the current voltage is greater than or equal to... and less than When the current voltage is less than a certain value, it indicates that the battery is slightly to moderately discharged and enters the preset low-voltage charging mode; When this occurs, it indicates that the battery is extremely deeply discharged and enters the preset extreme discharge mode.

[0042] Furthermore, when the current voltage is greater than or equal to and less than When the current voltage is greater than or equal to the specified value, it indicates that the battery is only slightly discharged; and less than This indicates that the battery is moderately discharged. > > .

[0043] In step S103, if the current charging mode is a preset low-voltage charging mode or a preset extreme power depletion mode, the target battery is charged according to the charging strategy corresponding to the current charging mode.

[0044] Optionally, in some embodiments, when the current charging mode is a preset low-voltage charging mode, the target battery is charged according to the charging strategy corresponding to the current charging mode, including: controlling the high-voltage main relay of the target battery to remain in an open state; and charging the target battery based on an external charging device.

[0045] Among them, external charging equipment refers to an external power supply device that is independent of the vehicle body, can be connected to the vehicle's external charging equipment interface, and can provide power to the vehicle. The power is not taken from the vehicle's own power battery.

[0046] Specifically, when the current charging mode of the battery is the preset low-voltage charging mode, the high-voltage main relay is disconnected, the high-voltage bus has no voltage, and the charging energy does not pass through the power battery. At the same time, a new high-voltage system linkage monitoring is added (real-time detection of high-voltage bus voltage and high-voltage relay status). If an abnormality in the high-voltage system is detected, the charging is immediately interrupted and an alarm is triggered.

[0047] Furthermore, in this embodiment, the on-board charger connection is first confirmed. After the charging gun is detected to be connected, the power supply capacity and connection status are analyzed through the CP / CC (Connection Confirm) signal (such as GB / T 20234.2 (Connection set for conductive charging of electric vehicles—Part 2: AC charging coupler, "Connection device for conductive charging of electric vehicles—Part 2: AC charging interface")). When the power supply is unstable, charging is refused and a prompt signal is output. For example, when the power is <1.5kW or the voltage fluctuation is >±5V, charging is refused and a prompt is given. When the power supply is stable, the operating parameters are sent to the on-board charger. At the same time, the on-board charger compatibility test is completed, and the corresponding upper limit of charging current is automatically identified and matched for external charging devices with different power specifications from 1.5kW to 3.5kW (1.5kW corresponds to 7A, 3.5kW corresponds to 15A). After determining that the battery discharge type is mild or moderate, this embodiment closes the controllable switch (MOS (Metal-Oxide-Semiconductor field-effect transistor) with a switching response ≤10ms) and activates pre-charge protection (10Ω pre-charge resistor) to limit the instantaneous current to less than or equal to 2A. After pre-charging is completed (e.g., 500ms), the pre-charge resistor is short-circuited. This embodiment adds voltage change monitoring during the pre-charging stage. If the pre-charge voltage rise rate is >0.5V / s, the switch is immediately disconnected to avoid hardware damage. After pre-charging is completed, this embodiment issues a start command, and the on-board charger starts the ACDC (Alternating Current-Direct Current) and the built-in DC / DC unit, sharing the main control and power link, and coordinates the adjustment to convert 220V AC power to an adapted low voltage. This application's embodiments introduce a new integrated architecture-specific collaborative logic: the ACDC output voltage and DC / DC input voltage are linked in real time to avoid voltage fluctuations, while simultaneously monitoring DC / DC output ripple to ensure charging stability. This collaborative logic differs from the independent control mode of a split architecture. For example, based on the startup command, the ACDC converts 220V to 400V±10V DC, and the DC / DC step-down is adjusted to the appropriate voltage (slight 13.5V, deep 12V). This application's embodiments monitor the DC / DC output ripple in real time (≤50mV is normal). If the ripple is abnormal, the main controller synchronously adjusts the ACDC output voltage and DC / DC step-down parameters to ensure charging stability. This collaborative logic, unlike the independent control of a split architecture, prevents voltage fluctuations from damaging the battery.

[0048] Furthermore, in this embodiment of the application, operating parameters are collected in real time during charging, and a three-stage differentiated charging strategy of trickle charging, constant current charging, and constant voltage charging is executed to dynamically adjust the parameters. For example... Figure 2 As shown, Figure 2 This is a schematic diagram of the charging curve of a multi-stage charging strategy provided according to an embodiment of this application. < At that time, the battery was classified as moderately discharged, and the embodiment of this application adopted trickle pre-charging; ≥ At that time, the battery is slightly discharged. In this embodiment, constant current pre-charging is used; after reaching the float charging voltage, the voltage is kept constant and the current drops to 0.5A to 1A to complete the charging process.

[0049] This application embodiment adds a self-learning function for charging parameters, recording the battery type, aging level (capacity decay rate calculated by fitting the charging curve), ambient temperature, and charging efficiency for each charging cycle, establishing a self-learning model, and automatically adapting the optimal charging parameters (such as trickle current and fast charging time) for subsequent charging cycles, thus solving the defects of fixed charging parameters and inability to adapt to batteries of different ages in related technologies. When the charging current drops to the preset termination current, the charging cycle is determined to be complete, the controllable switch is disconnected, and the charging record, leakage fault information, and updated self-learning parameters are stored and uploaded to the vehicle-mounted T-BOX (Telematics Box, remote information processing terminal), providing data support for subsequent fault tracing and control strategy iteration optimization. Finally, the system switches back to a low-power sleep state, completing a low-voltage charging cycle.

[0050] Optionally, in some embodiments, when the current charging mode is a preset extreme power depletion mode, the target battery is charged according to the power replenishment strategy corresponding to the current charging mode, including: charging the target battery through a preset auxiliary power supply; and charging the target battery through a preset main power supply when the voltage of the target battery after charging is greater than or equal to a preset voltage.

[0051] Furthermore, when the current charging mode of the battery is the preset extreme low-power mode, this embodiment first performs signal detection and compatibility confirmation. After the vehicle charger is connected, the CP / CC signal is detected to determine the connection validity, and the CP signal protocol of the vehicle charger is identified to adapt to the control logic of different manufacturers' equipment, avoiding start-up failures caused by protocol incompatibility. This embodiment further performs power switching and voltage regulation. When the main power supply is <4.5V and the CP voltage is >9V, the CP auxiliary power supply is automatically connected. After voltage regulation and filtering, the start-up voltage of 5V±0.1V adapted to the controller is obtained. At the same time, the working status of the voltage regulation circuit is monitored in real time. Once an abnormal voltage regulation output is detected (i.e., the output voltage deviation is >±0.2V), the system immediately switches to the backup voltage regulation path (provided by the backup voltage regulation chip) to ensure reliable power-up of the controller. The CP auxiliary power supply refers to the power supply built using the weak power provided by the control guide signal line of AC charging. When the vehicle battery is deeply discharged and cannot supply power to the vehicle controller, it no longer relies on the battery for power, but directly obtains power from the CP signal line to wake up the control unit, realizing emergency start-up under conditions of no battery power supply.

[0052] Furthermore, this embodiment wakes up the control module with a minimum power consumption of no more than 50mW, enabling only necessary functions and dynamically adjusting power consumption based on the CP auxiliary power supply's capacity. If the CP supply current is <100mA, unnecessary current acquisition functions are disabled, reducing power consumption to ≤30mW to avoid CP signal line overload and increasing the startup success rate under extreme conditions to over 99.5%. This embodiment confirms stable power supply from the vehicle charger (vehicle charger power ≥1.5kW); otherwise, it prompts for reconnection. Simultaneously, it checks the high-voltage system status (high-voltage bus voltage ≤10V) to ensure the high-voltage main relay is in the open state, preventing false starts of the high-voltage circuit and strengthening safety protection.

[0053] Furthermore, in this embodiment, the pre-charge instantaneous current is limited to ≤0.5A, and trickle charging with a minimum of no more than 0.2A is used to prioritize restoring the battery's current voltage to the controller's normal operating threshold. The voltage drop rate during the trickle charging phase is continuously monitored, and if abnormal voltage decay occurs (e.g., dU / dt < -0.05V / min), the trickle current is immediately adjusted (to 0.1A) to prevent battery polarization damage. When the battery's current voltage recovers to the main power supply's operating threshold (e.g., ... When the voltage is ≥5.5V, the embodiment of this application switches to the main power supply of the battery and shuts down the voltage regulation and filtering circuit of the CP auxiliary power supply, according to the smooth power supply switching strategy (series 100 (Capacitors) suppress voltage surges to prevent damage to the controller. After the power supply switch is completed, this embodiment of the application launches a low-power operation state, calls a pre-built self-learning model of charging parameters and combines it with the characteristics of this power depletion, and switches to a preset low-voltage replenishment mode charging process to achieve a smooth transition from emergency pre-charging to regular controllable charging.

[0054] For example, such as Figure 3 As shown, Figure 3 This is a flowchart of a charging method under a preset extreme power depletion mode according to an embodiment of this application. The charging method under the preset extreme power depletion mode includes the following steps: S301, Signal Detection and Compatibility Confirmation.

[0055] S302, dual-channel power supply switching and voltage regulation filtering.

[0056] S303, Lowest power startup and function activation.

[0057] S304, Secondary Confirmation and High-Voltage Linkage Detection.

[0058] S305, Minimum trickle start charging and voltage monitoring.

[0059] S306, Main power restoration and power supply switching.

[0060] S307, normal charging restored.

[0061] Therefore, the current charging mode of the battery is determined based on its current voltage range. When the charging mode is a preset low-voltage replenishment mode or a preset extreme discharge mode, the target battery is charged according to the corresponding replenishment strategy. This solves the problems of lack of emergency replenishment capability, insufficient anti-interference capability, and susceptibility to battery polarization damage that affects battery life in related technologies, significantly improving practicality and versatility.

[0062] Furthermore, in order to solve the problem of repeated power loss at its root, this application embodiment performs power loss type identification and leakage location.

[0063] Optionally, in some embodiments, before charging the target battery, the method further includes: determining that the target battery's discharge type is static discharge in response to the voltage change rate of the target battery being less than or equal to a preset change rate; and determining that the discharge type is leakage discharge in response to the voltage change rate being greater than the preset change rate.

[0064] Furthermore, in some embodiments, after determining that the power loss type is leakage power loss, the method further includes: determining the leakage load branch and leakage current value based on at least one branch current of the target battery; generating early warning information based on the leakage load branch and leakage current value, and sending the early warning information to a preset mobile terminal.

[0065] The preset rate of change can be a rate of change set by the user, a rate of change obtained through a finite number of experiments, or a rate of change obtained through a finite number of computer simulations.

[0066] Specifically, this application embodiment also collects the battery voltage change rate dU / dt and the current of each branch of the low-voltage circuit (including the output current of the on-board charger, the battery charging and discharging current, and the current of each electrical load branch). After 500ms moving average filtering preprocessing, dU / dt is reduced from 5 times... The fitting calculation shows that when dU / dt > 0.1V / min, an interrupt is triggered, and the power depletion identification and leakage location process is started.

[0067] Furthermore, this embodiment of the application combines dU / dt with a preset rate of change (which can be 0.1V / min) to identify static power loss or leakage power loss. dU / dt ≤ 0.1V / min indicates static power loss, and dU / dt > 0.1V / min indicates leakage power loss. For the identified abnormal leakage power loss, this embodiment of the application performs leakage location. By comparing the current difference between each branch of the low-voltage circuit, the specific leakage load branch (such as the output current of the on-board charger, the charging and discharging current of the battery, the current of the navigation / sleep load, etc.) is located, and the leakage branch identification and leakage current magnitude are recorded. Specifically, the leakage current location method collects the current of each branch through the current acquisition module, calculates the difference between the output current of the on-board charger, the charging and discharging current of the battery, and the sum of the currents of each load branch. If the difference is greater than 0.05A, leakage is determined. The specific leakage branch is located by combining the abnormal branch current situation (e.g., if the current of the navigation branch increases abnormally, it is determined to be navigation leakage). The leakage branch identifier, leakage current magnitude, and duration are recorded. If the leakage continues for more than 5 minutes, this embodiment of the application triggers a forced suspension of charging and sends an early warning.

[0068] Before charging the target battery, this embodiment sets charging parameters based on the type of battery depletion and leakage location results (no leakage / specific leakage branch). If leakage exists, this embodiment simultaneously sends a leakage branch warning to the user (via the vehicle's instrument panel or a mobile application). For example, if leakage exists, the leakage branch is displayed on the vehicle's instrument panel (e.g., "Navigation branch leakage"), and a warning message is pushed to the mobile application.

[0069] Therefore, by comparing branch currents to locate leakage loads, fault warning and tracing can be achieved, and differentiated charging can extend battery life by more than 30%.

[0070] Furthermore, in order to suppress the risk of battery aging and device overheating caused by high temperature, the embodiments of this application set a temperature threshold.

[0071] Optionally, in some embodiments, when charging the target battery according to the charging strategy corresponding to the current charging mode, the method further includes: when the temperature of the target battery is greater than a first temperature or the temperature of the current on-board charger is greater than a second temperature, performing reduced-current charging or pausing charging on the target battery.

[0072] The first temperature and the second temperature can be temperatures preset by the user, temperatures obtained through a limited number of experiments, or temperatures obtained through a limited number of computer simulations.

[0073] Specifically, embodiments of this application collect the temperature of the target battery in real time. and the temperature of the current on-board charger (OBC) Furthermore, this application embodiment implements dual temperature control linkage, where the target battery temperature is higher than a first temperature (e.g., ...). ) or the current temperature of the on-board charger is greater than the second temperature (e.g. When the flow rate drops by 20% or the temperature exceeds the limit, the process will be paused.

[0074] Therefore, by adopting a control method of reducing current or suspending charging when the battery temperature exceeds the first temperature or the on-board charger temperature exceeds the second temperature, the safety and reliability of the charging process are improved.

[0075] To help those skilled in the art further understand the battery charging method proposed in the embodiments of this application, further explanation is provided below with reference to specific embodiments.

[0076] On the one hand, such as Figure 4 As shown, Figure 4 This is a flowchart of a battery charging method according to an embodiment of this application, the battery charging method including the following steps: S401, Begin.

[0077] S402, multi-parameter acquisition and preprocessing.

[0078] S403, determine whether there is a power shortage, and identify the power shortage type, locate the leakage current, and determine the power shortage status. If it exists, proceed to step S405; otherwise, return to step S404.

[0079] S404, return to sleep mode, awaiting the next test. S405, confirm charging mode.

[0080] If it is a low-voltage power supply mode, then step S407 is executed; if it is an extreme power supply mode, then step S406 is executed.

[0081] S406, extreme battery depletion replenishment mode, and execute step S408.

[0082] S407, low-voltage battery charging mode, and execute step S408.

[0083] S408, End.

[0084] On the other hand, this application embodiment proposes a low-voltage battery power replenishment system 20, which includes: a wake-up control module 1, a voltage detection module 2, an integrated on-board charger 3, a controllable switch 4, a charging interface module 5, a temperature acquisition module 6, a pre-charge protection circuit 7, a hardware isolation circuit 8, a current acquisition module 9, a leakage current location module 11, a self-learning module 12, and a high-voltage monitoring module 13. The integrated on-board charger 3 integrates ACDC and DC / DC converters, sharing the main control and power link, without an external DC / DC converter, and also includes a ripple monitoring unit. Both the wake-up control module 1 and the integrated on-board charger 3 have dual power supplies; the CP auxiliary power supply is regulated and filtered by a voltage regulator circuit, and a backup voltage regulator path is also provided. The current acquisition module 9 acquires the current of each branch of the low-voltage circuit, the leakage current location module 11 locates the leakage branch through current difference, the self-learning module 12 establishes a self-learning model of charging parameters, and the high-voltage monitoring module 13 monitors the high-voltage system status. The temperature acquisition module 6 acquires dual temperatures, the pre-charge protection circuit 7 limits instantaneous current, and the optocoupler isolates the charging circuit from the high-voltage system. Furthermore, the wake-up control module 1 integrates a data recording module, synchronously uploading data to the on-board T-BOX; the controllable switch is a MOSFET (response ≤10ms); the voltage regulator and filter circuit is designed with two paths, main and auxiliary, to prevent interference; and the smooth transition circuit is implemented with a series capacitor.

[0085] Therefore, this application proposes an integrated architecture and dedicated collaborative control, eliminating the need for an external DC / DC converter. The ACDC and DC / DC converters work together to regulate the power, and new voltage linkage and ripple monitoring significantly improve charging efficiency. This can be achieved with only a software upgrade, facilitating widespread adoption. Unlike existing separate architectures with independent control, this addresses the shortcomings of hardware redundancy and low efficiency. It does not rely on the power battery, adding hardware isolation and high-voltage system linkage monitoring to prevent false starts in the high-voltage circuit, adapting to scenarios where the power battery is depleted. This fundamentally differs from existing solutions, completely resolving the over-discharge problem caused by reliance on the high-voltage system and power battery. Extreme self-starting reliability is improved through CP voltage regulation and low power consumption collaboration, along with new protocol adaptation and fault backup paths, significantly increasing the start-up success rate and addressing pain points such as inability to start and insufficient reliability. It is also compatible with vehicle chargers from different manufacturers. Enhanced versatility; low-power identification and leakage location, differentiated charging extends battery life by over 30%, and the addition of leakage location and early warning solves the problem of repeated low-power issues at the root, significantly improving practicality; self-learning adaptive charging automatically adapts to batteries with different aging levels and operating conditions, improving charging efficiency and battery life, and avoiding undercharging or overcharging caused by fixed parameters; multi-dimensional safety protection, with the addition of pre-charge voltage monitoring, voltage stabilization fault backup, and high-voltage linkage detection, greatly improving charging safety and avoiding hardware damage and safety hazards; fault traceability, with charging data, leakage data, and self-learning parameters archived simultaneously, facilitating later fault investigation and strategy optimization; strong versatility, compatible with existing architectures, requiring no hardware modifications, adaptable to existing and new vehicle models, and compatible with vehicle chargers of different power and from different manufacturers, making it applicable to a wider range of scenarios.

[0086] The battery charging method proposed in this application determines the current charging mode of the battery based on the current voltage range. When the charging mode is a preset low-voltage replenishment mode or a preset extreme power depletion mode, the target battery is charged according to the corresponding replenishment strategy. This solves the problems of lack of emergency replenishment capability, insufficient anti-interference capability, and susceptibility to battery polarization damage that affects battery life in related technologies, significantly improving practicality and versatility.

[0087] Next, the battery charging device according to the embodiments of this application is described with reference to the accompanying drawings.

[0088] Figure 5 This is a block diagram of a battery charging device according to an embodiment of this application.

[0089] like Figure 5 As shown, the battery charging device 10 includes: a data acquisition module 100, a determination module 200, and a charging module 300, wherein, Acquisition module 100 acquires the current voltage of the target battery; The module 200 determines the target voltage range in which the current voltage is located, and determines the current charging mode of the target battery based on the target voltage range; The charging module 300 charges the target battery according to the charging strategy corresponding to the current charging mode when the current charging mode is a preset low-voltage charging mode or a preset extreme power loss mode.

[0090] According to one embodiment of this application, before charging the target battery, the charging module 300 is further configured to: In response to the target battery's voltage change rate being less than or equal to a preset change rate, the target battery's discharge type is determined to be static discharge. If the voltage change rate is greater than the preset change rate, the power loss type is determined to be leakage power loss.

[0091] According to one embodiment of this application, after determining that the power loss type is leakage power loss, the charging module 300 is further configured to: Determine the leakage load branch and leakage current value based on the current of at least one branch of the target battery; Early warning information is generated based on the leakage load branch and leakage current value, and the early warning information is sent to the preset mobile terminal.

[0092] According to one embodiment of this application, the determining module 200 is specifically used for: The target voltage range is the first range, and the current charging mode is the preset low-voltage charging mode. The target voltage range is the second range, and the current charging mode is the preset extreme power depletion mode; The upper limit of the second interval is less than the lower limit of the first interval.

[0093] According to one embodiment of this application, when the current charging mode is a preset low-voltage charging mode, the charging module 300 is specifically used for: The high-voltage main relay of the target battery is kept in the off state. The target battery is charged using an external charging device.

[0094] According to one embodiment of this application, when the current charging mode is a preset extreme power depletion mode, the charging module 300 is specifically used for: The target battery is charged using a preset auxiliary power source; When the voltage of the target battery after charging is greater than or equal to the preset voltage, the target battery is charged through the preset main power supply.

[0095] According to one embodiment of this application, when charging the target battery according to the power replenishment strategy corresponding to the current charging mode, the charging module 300 is further configured to: When the temperature of the target battery is higher than the first temperature or the temperature of the current on-board charger is higher than the second temperature, the target battery is charged with reduced current or charging is paused.

[0096] It should be noted that the foregoing explanation of the battery charging method embodiment also applies to the battery charging device of this embodiment, and will not be repeated here.

[0097] The battery charging device proposed in this application determines the current charging mode of the battery based on the current voltage range of the battery. When the charging mode is a preset low-voltage replenishment mode or a preset extreme power depletion mode, the target battery is charged according to the corresponding replenishment strategy. This solves the problems of lack of emergency replenishment capability, insufficient anti-interference capability, and susceptibility to battery polarization damage that affects battery life in related technologies, significantly improving practicality and versatility.

[0098] Figure 6 This is a schematic diagram of a vehicle provided in an embodiment of the present invention. The vehicle may include: The memory 601, the processor 602, and the computer program stored on the memory 601 and capable of running on the processor 602.

[0099] When the processor 602 executes the program, it implements the battery charging method provided in the above embodiments.

[0100] Furthermore, the vehicle also includes: Communication interface 603 is used for communication between memory 601 and processor 602.

[0101] The memory 601 is used to store computer programs that can run on the processor 602.

[0102] The memory 601 may include high-speed RAM (Random Access Memory) memory, and may also include non-volatile memory, such as at least one disk storage.

[0103] If the memory 601, processor 602, and communication interface 603 are implemented independently, then the communication interface 603, memory 601, and processor 602 can be interconnected via a bus to complete communication between them. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0104] Optionally, in a specific implementation, if the memory 601, processor 602, and communication interface 603 are integrated on a single chip, then the memory 601, processor 602, and communication interface 603 can communicate with each other through an internal interface.

[0105] Processor 602 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement embodiments of the present invention.

[0106] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the battery charging method described above.

[0107] This application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps in any of the above-described battery charging method embodiments.

[0108] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0109] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0110] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery charging method, characterized in that, include: Collect the current voltage of the target battery; Determine the target voltage range in which the current voltage is located, and determine the current charging mode of the target battery based on the target voltage range; When the current charging mode is a preset low-voltage charging mode or a preset extreme power depletion mode, the target battery is charged according to the charging strategy corresponding to the current charging mode.

2. The method according to claim 1, characterized in that, Before charging the target battery, the method further includes: In response to the voltage change rate of the target battery being less than or equal to a preset change rate, the type of battery depletion is determined to be static depletion. In response to the voltage change rate being greater than the preset change rate, the power loss type is determined to be leakage power loss.

3. The method according to claim 2, characterized in that, After determining that the power loss type is leakage power loss, the following steps are also included: The leakage load branch and leakage current value are determined based on at least one branch current of the target battery. Based on the leakage load branch and the leakage current value, an early warning message is generated and sent to a preset mobile terminal.

4. The method according to claim 1, characterized in that, Determine the current charging mode of the target battery based on the target voltage range, including: The target voltage range is the first range, and the current charging mode is the preset low-voltage charging mode. The target voltage range is the second range, and the current charging mode is the preset extreme power depletion mode; The upper limit of the second interval is less than the lower limit of the first interval.

5. The method according to claim 1 or 4, characterized in that, When the current charging mode is the preset low-voltage charging mode, charging the target battery according to the charging strategy corresponding to the current charging mode includes: The high-voltage main relay of the target battery is kept in the off state. The target battery is charged using an external charging device.

6. The method according to claim 1 or 4, characterized in that, When the current charging mode is the preset extreme power depletion mode, the target battery is charged according to the power replenishment strategy corresponding to the current charging mode, including: The target battery is charged using a preset auxiliary power source; When the voltage of the target battery after charging is greater than or equal to the preset voltage, the target battery is charged through the preset main power supply.

7. The method according to claim 1, characterized in that, When charging the target battery according to the replenishment strategy corresponding to the current charging mode, the method further includes: When the temperature of the target battery is greater than a first temperature or the temperature of the current on-board charger is greater than a second temperature, the target battery is charged with reduced current or charging is paused.

8. A battery charging device, characterized in that, include: The data acquisition module collects the current voltage of the target battery. The determination module determines the target voltage range in which the current voltage is located, and determines the current charging mode of the target battery based on the target voltage range; The charging module, when the current charging mode is a preset low-voltage charging mode or a preset extreme power depletion mode, charges the target battery according to the charging strategy corresponding to the current charging mode.

9. A vehicle, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the battery charging method as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the battery charging method as described in any one of claims 1-7.

Images