Battery charging system and method based on trickle circuit

Abstract

The invention provides a battery charging system and method based on a trickle circuit, and relates to the technical field of battery charging. A battery charging module is constructed through a vehicle-mounted charger, a trickle module, an MCU and a battery; performing battery charging data state analysis on the battery charging module to obtain battery charging analysis data, further determining a trickle charging threshold value, triggering trickle current limiting mode switching, and obtaining trickle mode switching information; performing trickle charging control analysis according to the trickle mode switching information to obtain trickle current control data; according to the invention, large current impact under the condition of the tail end of the battery is protected, the service life of the battery is prolonged, and the problem of battery aging caused by full charge of the battery is solved.

Description

Technical Field

[0001] This invention proposes a battery charging system and method based on a trickle circuit, relating to the field of battery charging technology, specifically to the field of trickle circuit battery charging technology. Background Technology

[0002] When lead-acid batteries are used in truck parking batteries, their characteristics mean they lack circuit protection. However, the use of lithium iron phosphate batteries in truck parking batteries requires consideration of battery safety and the safety of the truck during operation, protecting the battery from safety issues such as shortened lifespan, bulging, and overcharging caused by high current surges. Summary of the Invention

[0003] This invention provides a battery charging system and method based on a trickle circuit to solve the above-mentioned problems:

[0004] This invention proposes a battery charging system and method based on a trickle circuit, the method comprising:

[0005] S1. Construct a battery charging module using an on-board charger, trickle charging module, MCU, and battery;

[0006] S2. Analyze the battery charging data status of the battery charging module to obtain battery charging analysis data, and then determine the trickle charging threshold, trigger the trickle current limiting mode switching, and obtain trickle mode switching information.

[0007] S3. Perform trickle charging control analysis based on trickle mode switching information to obtain trickle current control data;

[0008] S4. Perform termination current control based on the trickle current control data.

[0009] Further, S1 includes:

[0010] Connect the vehicle charger to the trickle charging module, and connect the trickle charging module to the battery and the MCU respectively to obtain a battery charging module;

[0011] The on-board charger has a built-in DC-DC device, which includes a constant voltage charging mode and a trickle current limiting mode.

[0012] The maximum current in the trickle current limiting mode is 2A.

[0013] Further, S2 includes:

[0014] Preset charging data is obtained through the MCU, and the battery is charged through constant voltage charging mode according to the preset charging data to obtain battery charging data.

[0015] Perform battery charging data analysis to obtain battery charging analysis data;

[0016] Determine the trickle charging threshold based on battery charging analysis data;

[0017] Trickle charging threshold combined with battery charging data triggers trickle current limiting mode switching to obtain trickle mode switching information.

[0018] Furthermore, the step of performing battery charging data analysis on the battery charging data to obtain battery charging analysis data includes:

[0019] Obtain data on the types of battery charging factors based on battery charging data;

[0020] Calculate the ratio of the battery charging factor type data to the corresponding type state threshold to obtain the factor state coefficient;

[0021] Obtain preset category weight data for multiple battery charging factor types;

[0022] Calculate the product of the factor state coefficient and the preset category weight data to obtain the factor weight state coefficient;

[0023] Calculate the average of the factor weight state coefficients for all battery charging factor types to obtain the battery charging state coefficient.

[0024] The battery state of charge coefficient is compared with a preset battery state of charge threshold to obtain a battery state of charge comparison result.

[0025] The battery charging state comparison results are the battery charging analysis data.

[0026] Further, the step of triggering trickle current limiting mode switching based on the trickle charging threshold and battery charging data to obtain trickle mode switching information includes:

[0027] When the battery charging data reaches the trickle charging threshold, the MCU cuts off the main circuit, switches the constant voltage charging mode to trickle current limiting mode, and obtains trickle mode switching information.

[0028] When the battery charging data does not reach the trickle charging threshold, the trickle current limiting mode is not triggered, and trickle mode charging information is not obtained.

[0029] Further, S3 includes:

[0030] Based on the trickle charging mode switching information, obtain trickle charging data;

[0031] Trickle charging data analysis is performed on the trickle charging data to obtain trickle charging analysis data;

[0032] Determine the trickle current control parameters based on trickle charging analysis data;

[0033] Trickle current control is performed on the trickle current charging data based on the trickle current control parameters to obtain trickle current control data.

[0034] Furthermore, the step of performing trickle charging data analysis on the trickle charging data to obtain trickle charging analysis data includes:

[0035] The trickle charging data is divided into real-time single-cell voltage, real-time trickle charging current, cell voltage range, and trickle charging duration to obtain multiple types of trickle charging data.

[0036] Calculate the ratio of the data for each trickle type to the corresponding preset trickle type state threshold to obtain the trickle type state coefficient;

[0037] Obtain preset trickle weight data for multiple trickle types;

[0038] Calculate the product of the trickle type state coefficient and the corresponding preset trickle weight data to obtain the trickle weight state coefficient;

[0039] Calculate the average of the trickle weight state coefficients for all trickle types to obtain the comprehensive trickle state coefficient;

[0040] The trickle integrated state coefficient is compared with the preset trickle integrated state threshold to obtain the trickle integrated state comparison result.

[0041] The results of the trickle charge comprehensive state comparison are the trickle charge analysis data.

[0042] Further, the step of controlling the trickle current based on the trickle current control parameters to obtain trickle current control data includes:

[0043] Based on the trickle charging analysis data, trickle state anomaly determination is performed to obtain trickle anomaly determination information;

[0044] Based on the trickle anomaly determination information, determine whether the cell voltage range is greater than the preset cell voltage difference equalization threshold, and obtain the cell determination result;

[0045] Based on the cell judgment result, the trickle current control parameter is determined to be either a stepped current reduction parameter or a current stabilization adjustment parameter, thus obtaining the adjustment judgment type;

[0046] The MCU sends a current adjustment command to the trickle module based on the adjustment type, generating trickle current control data.

[0047] Further, S4 includes:

[0048] Determine the trickle termination threshold based on the trickle current control data;

[0049] Triggering termination current control based on the trickle charge termination threshold and the trickle charge data to obtain termination current control information.

[0050] Furthermore, the system includes:

[0051] Build-up modules are used to construct battery charging modules using an onboard charger, trickle charging module, MCU, and battery;

[0052] The charging control module is used to analyze the battery charging data status of the battery charging module, obtain battery charging analysis data, determine the trickle charging threshold, trigger trickle current limiting mode switching, and obtain trickle mode switching information.

[0053] The trickle control module is used to perform trickle charging control analysis based on trickle mode switching information to obtain trickle current control data.

[0054] The termination module is used to perform termination current control based on the trickle current control data.

[0055] The beneficial effects of this invention are as follows: This method achieves battery control through trickle charging technology. It limits the charging current as the battery approaches full charge, extending the time it takes to reach full charge. This extends battery life, improves battery safety during actual use, and avoids issues such as screen flickering and control system malfunctions caused by pulse interference from overcharging. It also protects against large current surges at the end of the charging process, increasing battery life and mitigating battery aging caused by full charge. The advantages include reducing the overcharging time of lithium batteries, allowing the battery to absorb energy from the generator for a longer period, improving vehicle safety, reducing accelerated aging issues at full charge, increasing the battery's capacity to store more charge during trickle charging at the end of the charging process, and avoiding rapid overcharging caused by large current surges. Attached Figure Description

[0056] Figure 1 A schematic diagram of a battery charging method based on a trickle circuit;

[0057] Figure 2 This is a schematic diagram of a battery charging system based on a trickle circuit.

[0058] Figure 3 This is a schematic diagram of a battery charging module, which is a building block of a battery charging system based on a trickle circuit. Detailed Implementation

[0059] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0060] In one embodiment of the present invention, a battery charging system and method based on a trickle circuit is proposed, the method comprising:

[0061] S1. Construct a battery charging module using an on-board charger, trickle charging module, MCU, and battery;

[0062] S2. Analyze the battery charging data status of the battery charging module to obtain battery charging analysis data, and then determine the trickle charging threshold, trigger the trickle current limiting mode switching, and obtain trickle mode switching information.

[0063] S3. Perform trickle charging control analysis based on trickle mode switching information to obtain trickle current control data;

[0064] S4. Perform termination current control based on the trickle current control data, such as... Figure 1 As shown.

[0065] The working principle and technical effects of the above technical solution are as follows: This invention charges the battery through a trickle circuit using an MCU. Within the voltage difference range between the battery reaching a threshold (e.g., 3.5V) and the full charge voltage (3.65V), the charging time of the battery is extended. This not only protects against bulging and aging caused by long-term overcharging but also reduces the impact on the battery pack, which requires capacitors to absorb energy due to overcharging. Through the DC-DC converter, the current in the main circuit is switched to the trickle circuit to charge the battery. After the MCU detects that the individual cell voltage reaches 3.5V, it quickly cuts off the main circuit and enters current-limiting mode. In current-limiting mode, the maximum current is 2A. After entering current-limiting mode, it charges the battery with a small current until the individual cell is fully charged to 3.65V, and the overall voltage reaches 29.2V before shutting off the charging function.

[0066] The trickle-feed battery utilizes DC-DC technology, with the MCU controlling the switching on and off of trickle-feed mode. This addresses key issues such as battery safety, improved cycle life, and increased charging capacity. This protection feature is not supported by conventional lithium batteries.

[0067] The trigger threshold must accurately detect the battery voltage. The system can only switch from constant voltage charging mode to trickle charging mode when the voltage reaches the preset trickle charging start point (usually corresponding to a battery that is nearly fully charged, such as about 3.5V / cell for lithium-ion batteries). Inaccurate thresholds can lead to overcharging or undercharging.

[0068] When the charging current continues to decrease in trickle mode and falls below a preset termination current, the system should determine that the battery is fully charged and completely stop charging. This current value is typically set to 0.01C or lower (e.g., for a 1000mAh battery, the termination current is 1A or less).

[0069] Trickle current must be strictly controlled. Excessive current will continuously generate side reactions inside the battery, leading to lithium plating (in lithium batteries), causing permanent damage and the risk of thermal runaway. Insufficient current may prevent the battery from ever being fully charged. The trickle current needs to be kept stable to avoid large fluctuations due to power supply variations or load changes.

[0070] This method constructs a complete battery charging control process, encompassing module setup, threshold determination, trickle charging regulation, and charging termination. A complete charging hardware closed loop is built using the onboard charger, trickle charging module, MCU, and battery. The MCU then analyzes battery data during the charging process to accurately determine the trickle charging threshold and trigger mode switching. Dynamic current control is implemented for the charging state during the trickle charging phase. A termination threshold is set based on trickle charging regulation data, completing the closed-loop management of the charging process. The entire process uses the MCU as the core control unit to achieve real-time adaptation between the charging mode and the battery state.

[0071] This method solves the technical problems of traditional truck parking battery charging solutions lacking systematic control logic and failing to balance charging efficiency and battery safety; it achieves intelligent management and control of the entire process from hardware setup to charging termination, and connects the technical links of charging, protection, and termination; it improves the integrity and operability of the charging solution and ensures the coordination between each step; it reduces safety hazards such as battery overcharging and bulging caused by disordered charging process, while reducing the need for manual intervention.

[0072] In one embodiment of the present invention, S1 includes:

[0073] Connect the vehicle charger to the trickle charging module, and then connect the trickle charging module to the battery and the MCU respectively to obtain a battery charging module, such as... Figure 3 As shown;

[0074] The on-board charger has a built-in DC-DC device, which includes a constant voltage charging mode and a trickle current limiting mode.

[0075] The maximum current in the trickle current limiting mode is 2A.

[0076] The working principle and technical effect of the above technical solution are as follows: This method forms a battery charging module with a defined function through hardware connection, and electrically connects the vehicle charger and the trickle module. The trickle module simultaneously establishes signal and power supply connections with the battery and the MCU. The DCDC device built into the vehicle charger has two working modes: constant voltage charging mode for high-current fast charging when the battery voltage is low, and trickle current limiting mode for low-current supplementary charging when the battery is close to full charge. The maximum current of the trickle mode is limited to 2A. The MCU, as the control center, can collect battery status data in real time and send control commands to each module.

[0077] This method solves the technical problems of traditional charging solutions, such as loose hardware architecture, lack of dedicated trickle protection path, and lack of hardware support for charging mode switching. It realizes the integrated design of charging modules, clarifies the functional division of each hardware unit, and obtains a hardware carrier for switching between constant voltage charging and trickle current limiting modes. It improves the stability and compatibility of the charging system and adapts to the on-board application scenario of truck parking batteries. It reduces the probability of charging failure caused by chaotic hardware links, while avoiding the risk of high current impact on the battery during the trickle stage.

[0078] In one embodiment of the present invention, S2 includes:

[0079] Preset charging data is obtained through the MCU, and the battery is charged through constant voltage charging mode according to the preset charging data to obtain battery charging data.

[0080] Perform battery charging data analysis to obtain battery charging analysis data;

[0081] The trickle charging threshold is determined based on battery charging analysis data. When the battery state of charge coefficient is less than the preset battery state of charge threshold, the preset trickle charging threshold is adjusted downward based on the battery state of charge coefficient to obtain the trickle charging threshold.

[0082] Trickle charging threshold combined with battery charging data triggers trickle current limiting mode switching to obtain trickle mode switching information.

[0083] The working principle and technical effect of the above technical solution are as follows: The core of this method is an adaptive trickle charging threshold determination mechanism based on battery charging data. The MCU retrieves preset charging parameters, controls the DCDC device to fast charge the battery in constant voltage mode, and simultaneously collects battery data during the charging process; charging analysis data is generated by analyzing the charging data, and the initial trickle charging threshold is determined based on this; when the calculated battery charging state coefficient is lower than the preset threshold, the battery is determined to be in an aging or abnormal state, and the trickle trigger threshold is automatically lowered; based on the comparison between real-time battery data and the adjusted trickle threshold, it is determined whether to trigger the trickle current limiting mode switch, thereby achieving dynamic adaptation of the threshold.

[0084] This invention solves the technical problem that traditional fixed trickle charging thresholds cannot adapt to battery aging conditions and easily lead to overcharging or undercharging of aging batteries; it achieves adaptive adjustment of the trickle charging threshold, allowing the charging strategy to be dynamically optimized according to the real-time battery status; it improves the adaptability of the charging solution to batteries in different health states, ensuring the charging safety of aging batteries; it reduces the rate of battery life degradation caused by fixed thresholds, while also reducing the risk of pulse interference to the vehicle's infotainment system caused by overcharging.

[0085] In one embodiment of the present invention, the step of performing battery charging data analysis on battery charging data to obtain battery charging analysis data includes:

[0086] Battery charging factor data is obtained from battery charging data; the battery charging factor data includes voltage rise rate, charging current tolerance data, and cell voltage difference data, etc.

[0087] Calculate the ratio of the battery charging factor type data to the corresponding type state threshold to obtain the factor state coefficient;

[0088] Obtain preset category weight data for multiple battery charging factor types;

[0089] Calculate the product of the factor state coefficient and the preset category weight data to obtain the factor weight state coefficient;

[0090] Calculate the average of the factor weight state coefficients for all battery charging factor types to obtain the battery charging state coefficient.

[0091] The battery state of charge coefficient is compared with a preset battery state of charge threshold to obtain a battery state of charge comparison result.

[0092] The battery charging state comparison results are the battery charging analysis data.

[0093] The working principle and technical effect of the above technical solution are as follows: This method uses a weighted coefficient method to quantitatively analyze battery charging data. Key influencing factors such as voltage rise rate, charging current tolerance, and cell voltage difference are extracted from the collected battery charging data. The ratio of each factor's data to its corresponding preset state threshold is calculated to obtain the state coefficient of each factor. Different preset weights are assigned to each factor based on its impact on battery health. The weighted state coefficients of each factor are obtained through weighted calculation, and then the average value is calculated to obtain the comprehensive battery charging state coefficient. This coefficient is compared with the preset threshold to generate charging analysis data that can be directly used for threshold determination, ensuring the accuracy of the analysis results.

[0094] This method solves the technical problems of traditional charging data analysis methods, such as being too simplistic, failing to consider the weight differences of multiple factors, and providing one-sided analysis results. It achieves multi-dimensional and weighted quantitative assessment of battery charging status, improving the reliability of analysis results; it enhances the accuracy of battery status determination, avoiding misjudgments caused by single data anomalies; and it reduces the probability of incorrect switching of charging modes caused by data analysis errors.

[0095] In one embodiment of the present invention, the step of triggering trickle current limiting mode switching based on the trickle charging threshold and battery charging data to obtain trickle mode switching information includes:

[0096] When the battery charging data reaches the trickle charging threshold, the MCU cuts off the main circuit, switches the constant voltage charging mode to trickle current limiting mode, and obtains trickle mode switching information.

[0097] When the battery charging data does not reach the trickle charging threshold, the trickle current limiting mode is not triggered, and trickle mode charging information is not obtained.

[0098] The working principle and technical effect of the above technical solution are as follows: Based on the comparison between battery charging data and trickle charging threshold, precise switching control of charging mode is achieved. When the MCU detects that the battery charging data reaches or exceeds the adjusted trickle charging threshold, it immediately sends a control command to cut off the main charging circuit, and simultaneously controls the DCDC device to switch from constant voltage charging mode to trickle current limiting mode, and records the mode switching information; when the battery charging data does not reach the trickle charging threshold, the constant voltage charging mode is maintained, the mode switching is not triggered, and no trickle mode related information is generated, ensuring that the timing of mode switching is perfectly matched with the battery state.

[0099] It solves the technical problems of ambiguous timing, lack of clear triggering conditions, and easy delay or premature mode switching in traditional charging modes; it achieves precise and controllable switching of charging modes, ensuring that the battery enters trickle protection mode in time when it is close to full charge; it improves the safety of the charging process and avoids the risk of overcharging caused by continuous charging in constant voltage mode; it reduces problems such as battery swelling and aging caused by improper mode switching, and at the same time reduces the failure of vehicle system such as screen flickering and control system abnormalities caused by overcharging.

[0100] In one embodiment of the present invention, S3 includes:

[0101] Based on the trickle charging mode switching information, obtain trickle charging data;

[0102] Trickle charging data analysis is performed on the trickle charging data to obtain trickle charging analysis data;

[0103] Determine the trickle current control parameters based on trickle charging analysis data;

[0104] Trickle current control is performed on the trickle current charging data based on the trickle current control parameters to obtain trickle current control data.

[0105] The working principle and technical effect of the above technical solution are as follows: This method implements refined control of the trickle charging process. After receiving the trickle mode switching information, the MCU collects battery charging data in real time during the trickle phase; by analyzing the trickle charging data, trickle charging analysis data characterizing the charging stability and battery state during the trickle phase is generated; based on this analysis data, trickle current control parameters adapted to the current battery state are determined; the trickle charging current is dynamically adjusted according to the control parameters, and the data during the adjustment process is recorded to form complete trickle current control data, realizing closed-loop control during the trickle phase.

[0106] It solves the technical problems of traditional trickle charging mode, which uses a fixed current, cannot dynamically adjust according to the charging status, and has poor charging effect; it realizes precise and dynamic control of the charging current in the trickle stage, so that the trickle charging strategy matches the real-time state of the battery; it improves the adaptability and safety of trickle charging, and ensures the charging quality of the battery before full charge; it reduces the risk of overcharging or undercharging of the battery due to fixed trickle current, and further extends the battery cycle life.

[0107] In one embodiment of the present invention, the step of performing trickle charging data analysis on the trickle charging data to obtain trickle charging analysis data includes:

[0108] The trickle charging data is divided into real-time single-cell voltage, real-time trickle charging current, cell voltage range, and trickle charging duration to obtain multiple types of trickle charging data.

[0109] Calculate the ratio of each trickle flow type data to the corresponding preset trickle flow type state threshold to obtain the trickle flow type state coefficient; the preset trickle flow type state threshold includes a preset trickle flow stage single cell voltage ramp-up rate threshold, a preset trickle flow current fluctuation threshold, a preset cell voltage difference equalization threshold, and a preset trickle flow stage duration threshold.

[0110] Obtain preset trickle weight data for multiple trickle types;

[0111] Calculate the product of the trickle type state coefficient and the corresponding preset trickle weight data to obtain the trickle weight state coefficient;

[0112] Calculate the average of the trickle weight state coefficients for all trickle types to obtain the comprehensive trickle state coefficient;

[0113] The trickle integrated state coefficient is compared with the preset trickle integrated state threshold to obtain the trickle integrated state comparison result.

[0114] The results of the trickle charge comprehensive state comparison are the trickle charge analysis data.

[0115] Taking an 8-cell lithium iron phosphate start-up battery as an example, the preset thresholds are: single-cell voltage ramp-up rate 0.02V / min (weight 0.3), trickle current fluctuation 0.2A (weight 0.2), cell voltage difference balancing 50mV (weight 0.3), trickle charging time 60min (weight 0.2), and a preset trickle overall state threshold of 0.15. The specific steps are as follows:

[0116] Data collected during the trickle charging phase showed a real-time cell voltage ramp-up rate of 0.015V / min, trickle current fluctuation of 0.15A, cell voltage difference of 40mV, and trickle charging duration of 45min.

[0117] Divide each type of data by the corresponding preset threshold to obtain the voltage ramp-up rate coefficient of 0.75, the current fluctuation coefficient of 0.75, the cell voltage difference coefficient of 0.8, and the duration coefficient of 0.75.

[0118] Multiplying each state coefficient by its corresponding preset weight yields a voltage ramp rate weight coefficient of 0.225, a current fluctuation weight coefficient of 0.15, a cell voltage difference weight coefficient of 0.24, and a duration weight coefficient of 0.15.

[0119] The sum of the four weighting coefficients and the result divided by the number of data types (4) yields a comprehensive state coefficient of 0.19125.

[0120] The comprehensive state coefficient of 0.19125 is compared with the preset threshold of 0.15 to determine that the trickle charging state is normal. This determination result is the trickle charging analysis data.

[0121] The working principle and technical effect of the above technical solution are as follows: This method continues the weighted coefficient analysis logic to conduct a special evaluation of the trickle charging data. The trickle charging data is divided into four core data categories: real-time single-cell voltage, real-time trickle charging current, cell voltage range, and trickle charging duration. The ratio of each data category to its corresponding preset threshold is calculated to obtain the trickle charging state coefficient for each data category. Preset weights are assigned according to the degree of influence of each data category on trickle charging safety. The trickle charging weight state coefficients for each data category are obtained through weighted calculation, and then the average value is calculated to obtain the comprehensive trickle charging state coefficient. This coefficient is compared with the preset threshold to generate trickle charging analysis data for current control parameter determination, ensuring that the analysis results closely match the charging characteristics of the trickle charging stage.

[0122] It solves the technical problem of lacking targeted data analysis methods in the traditional trickle charging stage and being unable to accurately determine the trickle charging state; it realizes the quantitative assessment of the charging state in the trickle stage; it improves the accuracy of trickle charging state determination and ensures the rationality of subsequent current regulation; it reduces the risk of improper current regulation caused by misjudgment of trickle state and avoids battery damage caused by excessive cell voltage difference or abnormal current fluctuation.

[0123] In one embodiment of the present invention, the step of controlling the trickle current based on the trickle current control parameters to obtain trickle current control data includes:

[0124] Based on the trickle charging analysis data, trickle state anomaly determination is performed to obtain trickle anomaly determination information;

[0125] Based on the trickle anomaly determination information, determine whether the cell voltage range is greater than the preset cell voltage difference equalization threshold, and obtain the cell determination result;

[0126] Based on the cell judgment result, the trickle current control parameter is determined to be either a stepped current reduction parameter or a current stabilization adjustment parameter, thus obtaining the adjustment judgment type;

[0127] The MCU sends a current adjustment command to the trickle module based on the adjustment type, generating trickle current control data.

[0128] If the trickle charge state coefficient is significantly lower than the preset threshold (e.g., if the battery is at risk of short circuit), then a forced termination of charging will be triggered directly.

[0129] For example, analyzing trickle charging data reveals a trickle overall state coefficient of 0.7 and a cell voltage difference of 60mV, indicating an abnormal cell voltage difference and generating trickle anomaly judgment information. Comparison shows 60mV > 50mV, indicating an excessive cell voltage difference. Based on this result, the trickle current control parameter is determined to be a stepped current reduction parameter (e.g., gradually decreasing from 2A to 1A), and the adjustment judgment type is stepped current reduction. The MCU sends a stepped current reduction command to the trickle module, recording the adjustment amplitude, time, and corresponding voltage changes, generating trickle current control data. If the trickle overall state coefficient is detected to be 0.3 (significantly below 0.6, indicating a short circuit risk), a forced termination of charging is directly triggered, cutting off the charging path.

[0130] The working principle and technical effect of the above technical solution are as follows: This method implements differentiated current control based on trickle charging analysis data and sets up an anomaly fallback strategy. It determines whether there are any anomalies in the trickle charging stage based on the trickle charging analysis data; if the cell voltage difference is determined to exceed the preset equalization threshold, a stepped current reduction parameter is used to gradually reduce the trickle current to promote cell voltage equalization; if the current fluctuation is determined to exceed the preset threshold, a current stabilization adjustment parameter is used to maintain current stability and avoid impact; the MCU sends instructions to the trickle module according to the adjustment type to generate current control data; simultaneously, a fallback mechanism is set up: when the trickle charging comprehensive state coefficient is significantly lower than the threshold, it is determined that the battery has a serious safety hazard such as a short circuit, directly triggering forced termination of charging to ensure system safety.

[0131] It solves the technical problems of traditional trickle current control strategies being simplistic, lacking mechanisms to handle abnormal operating conditions, and easily causing safety accidents; it achieves differentiated and precise control of trickle current and emergency handling of severe anomalies, improving the system's fault tolerance; it enhances charging safety and cell balance during the trickle phase, ensuring the consistency of the battery pack; it reduces the risk of local overcharging caused by excessive cell voltage differences, while avoiding safety accidents caused by serious faults such as battery short circuits.

[0132] In one embodiment of the present invention, S4 includes:

[0133] Determine the trickle termination threshold based on the trickle current control data;

[0134] Triggering termination current control based on the trickle charge termination threshold and the trickle charge data to obtain termination current control information.

[0135] For example, extract real-time current (1.2A), voltage (3.62V per cell / 28.96V total), and cell range (20mV, good balance) from trickle current control data, and determine the termination threshold as "cell ≥ 3.65V and total voltage ≥ 29.2V" or "current ≤ 0.3A and cell ≥ 3.63V".

[0136] The MCU compares the trickle charging data in real time. When it detects that "single cell 3.65V, total 29.2V, current 0.4A" meets the threshold conditions, it immediately cuts off the charging path and generates termination current control information including termination time, trigger conditions, and execution results.

[0137] If a sudden drop in current of less than 0.1A is detected but the voltage of a single cell is only 3.5V (short circuit risk), an emergency termination is triggered, the circuit is cut off and an alarm is triggered, and the abnormal termination information is recorded.

[0138] The working principle and technical effect of the above technical solution are as follows: Based on the current control data of the trickle charging stage, a precise charging termination threshold is determined. The MCU extracts key state parameters such as battery voltage and current from the trickle current control data, and sets the trickle termination threshold in combination with the battery's full charge characteristics; it continuously monitors the trickle charging data, and when the data reaches the termination threshold, it immediately sends a control command to cut off the charging path, triggers termination current control, generates termination control information, and completes the entire charging process, ensuring that the charging termination timing is precisely matched with the battery's full charge state.

[0139] It solves the technical problems of insufficient basis for determining the charging termination time in traditional charging methods, which are prone to premature termination or overcharging termination; it realizes precise charging termination control based on trickle regulation data, ensuring the closed-loop integrity of the charging process; it improves the accuracy of charging termination, ensuring that the battery stops charging in time when it is fully charged; it reduces the risk of battery life degradation caused by overcharging, while avoiding the impact of undercharging on the performance of the start-up battery.

[0140] According to one embodiment of the present invention, the system includes:

[0141] Build-up modules are used to construct battery charging modules using an onboard charger, trickle charging module, MCU, and battery;

[0142] The charging control module is used to analyze the battery charging data status of the battery charging module, obtain battery charging analysis data, determine the trickle charging threshold, trigger trickle current limiting mode switching, and obtain trickle mode switching information.

[0143] The trickle control module is used to perform trickle charging control analysis based on trickle mode switching information to obtain trickle current control data.

[0144] The termination module is used to perform termination current control based on the trickle current control data.

[0145] The working principle and technical effects of the above technical solution are as follows: This system (e.g. Figure 2 As shown, a complete battery charging control process (including module setup, threshold determination, trickle charging control, and charging termination) is constructed. A complete charging hardware closed loop is built using the onboard charger, trickle charging module, MCU, and battery. The MCU then analyzes battery data during the charging process to accurately determine the trickle charging threshold and trigger mode switching. Dynamic current control is implemented for the charging state during the trickle charging phase. A termination threshold is set based on the trickle charging control data, completing the closed-loop management of the charging process. The entire process uses the MCU as the core control unit to achieve real-time adaptation between the charging mode and the battery state.

[0146] This system solves the technical problems of traditional truck parking battery charging solutions lacking systematic control logic and failing to balance charging efficiency and battery safety; it achieves intelligent management and control of the entire process from hardware setup to charging termination, and connects the technical links of charging, protection, and termination; it improves the integrity and operability of the charging solution and ensures the coordination between each step; it reduces safety hazards such as battery overcharging and bulging caused by disordered charging process, while reducing the need for manual intervention.

[0147] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A battery charging method based on a trickle circuit, characterized in that, The method includes: S1. Construct a battery charging module using an on-board charger, trickle charging module, MCU, and battery; S2. Analyze the battery charging data status of the battery charging module to obtain battery charging analysis data, and then determine the trickle charging threshold, trigger the trickle current limiting mode switching, and obtain trickle mode switching information. S3. Perform trickle charging control analysis based on trickle mode switching information to obtain trickle current control data; S4. Perform termination current control based on the trickle current control data.

2. The battery charging method based on a trickle circuit according to claim 1, characterized in that, S1 includes: Connect the vehicle charger to the trickle charging module, and connect the trickle charging module to the battery and the MCU respectively to obtain a battery charging module; The on-board charger has a built-in DC-DC device, which includes a constant voltage charging mode and a trickle current limiting mode. The maximum current in the trickle current limiting mode is 2A.

3. The battery charging method based on a trickle circuit according to claim 1, characterized in that, S2 includes: Preset charging data is obtained through the MCU, and the battery is charged through constant voltage charging mode according to the preset charging data to obtain battery charging data. Perform battery charging data analysis to obtain battery charging analysis data; Determine the trickle charging threshold based on battery charging analysis data; Trickle charging threshold combined with battery charging data triggers trickle current limiting mode switching to obtain trickle mode switching information.

4. The battery charging method based on a trickle circuit according to claim 3, characterized in that, The process of analyzing battery charging data to obtain battery charging analysis data includes: Obtain data on the types of battery charging factors based on battery charging data; Calculate the ratio of the battery charging factor type data to the corresponding type state threshold to obtain the factor state coefficient; Obtain preset category weight data for multiple battery charging factor types; Calculate the product of the factor state coefficient and the preset category weight data to obtain the factor weight state coefficient; Calculate the average of the factor weight state coefficients for all battery charging factor types to obtain the battery charging state coefficient. The battery state of charge coefficient is compared with a preset battery state of charge threshold to obtain a battery state of charge comparison result. The battery charging state comparison results are the battery charging analysis data.

5. The battery charging method based on a trickle circuit according to claim 3, characterized in that, The step of triggering trickle current limiting mode switching based on the trickle charging threshold and battery charging data, and obtaining trickle mode switching information, includes: When the battery charging data reaches the trickle charging threshold, the MCU cuts off the main circuit, switches the constant voltage charging mode to trickle current limiting mode, and obtains trickle mode switching information. When the battery charging data does not reach the trickle charging threshold, the trickle current limiting mode is not triggered, and trickle mode charging information is not obtained.

6. The battery charging method based on a trickle circuit according to claim 1, characterized in that, S3 includes: Based on the trickle charging mode switching information, obtain trickle charging data; Trickle charging data analysis is performed on the trickle charging data to obtain trickle charging analysis data; Determine the trickle current control parameters based on trickle charging analysis data; Trickle current control is performed on the trickle current charging data based on the trickle current control parameters to obtain trickle current control data.

7. The battery charging method based on a trickle circuit according to claim 6, characterized in that, The step of performing trickle charging data analysis to obtain trickle charging analysis data includes: The trickle charging data is divided into real-time single-cell voltage, real-time trickle charging current, cell voltage range, and trickle charging duration to obtain multiple types of trickle charging data. Calculate the ratio of the data for each trickle type to the corresponding preset trickle type state threshold to obtain the trickle type state coefficient; Obtain preset trickle weight data for multiple trickle types; Calculate the product of the trickle type state coefficient and the corresponding preset trickle weight data to obtain the trickle weight state coefficient; Calculate the average of the trickle weight state coefficients for all trickle types to obtain the comprehensive trickle state coefficient; The trickle integrated state coefficient is compared with the preset trickle integrated state threshold to obtain the trickle integrated state comparison result. The results of the trickle charge comprehensive state comparison are the trickle charge analysis data.

8. The battery charging method based on a trickle circuit according to claim 6, characterized in that, The step of controlling the trickle current based on the trickle current control parameters to obtain trickle current control data includes: Based on the trickle charging analysis data, trickle state anomaly determination is performed to obtain trickle anomaly determination information; Based on the trickle anomaly determination information, determine whether the cell voltage range is greater than the preset cell voltage difference equalization threshold, and obtain the cell determination result; Based on the cell judgment result, the trickle current control parameter is determined to be either a stepped current reduction parameter or a current stabilization adjustment parameter, thus obtaining the adjustment judgment type; The MCU sends a current adjustment command to the trickle module based on the adjustment type, generating trickle current control data.

9. The battery charging method based on a trickle circuit according to claim 1, characterized in that, S4 includes: Determine the trickle termination threshold based on the trickle current control data; Triggering termination current control based on the trickle charge termination threshold and the trickle charge data to obtain termination current control information.

10. A battery charging system based on a trickle circuit, characterized in that, The system includes: Build-up modules are used to construct battery charging modules using an onboard charger, trickle charging module, MCU, and battery; The charging control module is used to analyze the battery charging data status of the battery charging module, obtain battery charging analysis data, determine the trickle charging threshold, trigger trickle current limiting mode switching, and obtain trickle mode switching information. The trickle control module is used to perform trickle charging control analysis based on trickle mode switching information to obtain trickle current control data. The termination module is used to perform termination current control based on the trickle current control data.

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