Maintenance method and system for low-voltage storage battery of new energy vehicle and new energy vehicle

Abstract

The application discloses a new energy vehicle low-voltage storage battery maintenance method, system and new energy vehicle, and the maintenance method comprises the following steps: determining the maintenance requirement of the storage battery based on a preset trigger condition and a storage battery parameter; determining that the state of the new energy vehicle meets a new energy vehicle support maintenance type for storage battery maintenance; and determining the maintenance strategy type of the storage battery based on a preset trigger condition type and the new energy vehicle support maintenance type. The application determines the maintenance requirement and adopts diversified maintenance strategy types based on the determination of the preset trigger condition and the storage battery parameter, integrates information acquisition, processing and execution modules, realizes accurate monitoring and control of the state of the new energy vehicle and the storage battery, optimizes the charging and discharging process of the storage battery through slow-fast-slow trickle charging and full discharge and full charge maintenance methods, improves the charging efficiency and the performance of the storage battery, and prolongs the service life. The scheme of the application is intelligent, efficient and reliable, and provides reliable support for sustainable travel.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle maintenance technology, specifically to maintenance methods and systems for low-voltage batteries in new energy vehicles, and to new energy vehicles themselves. Background Technology

[0002] Currently, new energy vehicles use two power sources. The first is a high-voltage power battery, typically a 300V or higher lithium battery. The main function of the power battery is to provide power to the drive motor and to convert the high voltage to 12V low voltage via DC-DC converter to supply power to the vehicle's electrical loads during startup, while also charging the 12V low-voltage battery. The second is a low-voltage 12V battery, which uses a 12V lead-acid battery. The main function of the 12V low-voltage battery is to provide constant power (approximately 20mA-5A) to the vehicle when it is parked, maintaining the standby state of various controllers. Another function is to provide operating current (approximately 5A-100A) when high voltage is applied.

[0003] Low-voltage batteries often face the following problems during use: being deeply discharged due to occasional abnormal power consumption, which causes irreversible damage to the plates due to rapid charging with high current after deep discharge; and being kept at a high charge level for a long time under normal conditions due to deep charging and shallow discharging, which can easily lead to electrolyte evaporation and negative electrode sulfation. Both of these situations have a direct impact on the capacity decay and lifespan of low-voltage batteries, so the maintenance of low-voltage batteries is particularly important.

[0004] The existing technology has relatively simple conditions for judging the maintenance of low-voltage batteries, which cannot be combined with the actual vehicle usage and the working conditions of related devices. It also cannot formulate the best maintenance plan for low-voltage batteries based on various situations, which often results in poor maintenance of low-voltage batteries.

[0005] How to combine various influencing factors and formulate the best maintenance plan for low-voltage batteries in accordance with actual use scenarios is an urgent problem to be solved in this field. Summary of the Invention

[0006] To address the problem that batteries cannot formulate optimal maintenance plans based on complex operating conditions in actual applications, this invention provides a maintenance method, system, and vehicle for low-voltage batteries in new energy vehicles. It comprehensively considers the parameters of the battery, the status of the new energy vehicle, and the operating conditions of related maintenance equipment to provide battery maintenance strategies that are tailored to the actual situation, effectively improving the maintenance effect of the battery and extending its service life.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A method for maintaining a low-voltage battery in a new energy vehicle includes:

[0009] The maintenance needs of the battery are determined based on preset trigger conditions and battery parameters.

[0010] Determine if the status of the new energy vehicle meets the maintenance type supported by the new energy vehicle for battery maintenance.

[0011] The maintenance strategy for the battery is determined based on the preset trigger condition type and the maintenance type supported by new energy vehicles.

[0012] Preferably, the battery parameters include: battery charge value and charge change rate within a specified time range.

[0013] Preferably, the preset trigger condition type includes a first trigger condition and a second trigger condition.

[0014] Wherein, the first triggering condition is that the battery value is less than a first battery threshold and the rate of change of battery within a first time range is greater than a first rate of change threshold; and the second triggering condition is that the rate of change of battery within a second time range is less than a second rate of change threshold.

[0015] When the battery parameters meet the first or second trigger condition, it is determined that the battery needs maintenance.

[0016] Preferably, the new energy vehicle status includes: the new energy vehicle gear status, the power battery gear status, the charger working status, and the power battery charge level.

[0017] Preferably, the maintenance types supported by the new energy vehicles include:

[0018] The first type is when the new energy vehicle is in P gear, the power battery is in OFF gear, the charger is not connected, and the power battery charge meets the first preset threshold.

[0019] The second type is when the new energy vehicle is in P gear, the power battery gear is in OFF gear, the charger is in connected charging state, and the power battery charge meets the second preset threshold.

[0020] The third type is when the new energy vehicle is not in P gear, the power battery is in ON gear, the charger is in ready state, and the power battery charge meets the third preset threshold.

[0021] Preferably, the first preset threshold is less than the second preset threshold, and the second preset threshold is less than the third preset threshold.

[0022] Preferably, the maintenance strategy types include:

[0023] The first maintenance strategy is adopted when the battery meets the first triggering condition and the new energy vehicle supports maintenance type one, two, or three; and

[0024] The second maintenance strategy is adopted when the battery meets the second triggering condition and the new energy vehicle supports the first, second or third type of maintenance.

[0025] Preferably, the first maintenance strategy adopts a slow-fast-slow three-step trickle charging method, dividing the maintenance stage into a first stage, a second stage, and a third stage, wherein the charging power of the first stage and the third stage is less than the charging power of the second stage.

[0026] If the maintenance process in the first stage meets the first transition condition, it will proceed to the second stage; if the maintenance process in the second stage meets the second transition condition, it will proceed to the third stage; and if the maintenance process in the third stage meets the third transition condition, the maintenance will end.

[0027] Preferably, in the first maintenance strategy, the first transition condition, the second transition condition, and the third transition condition correspond to the battery's power increment threshold / charging time threshold, power threshold, and power threshold / charging time threshold during the first, second, and third stages of the maintenance process, respectively.

[0028] Preferably, the second maintenance strategy adopts a full discharge and full charge maintenance method. After the battery temperature and charge reach a preset level through a discharge load, the maintenance stage is divided into a first stage, a second stage and a third stage. The charging power of the first stage and the third stage is less than the charging power of the second stage.

[0029] If the maintenance process in the first stage meets the fourth transition condition, it will proceed to the second stage; if the maintenance process in the second stage meets the fifth transition condition, it will proceed to the third stage; if the maintenance process in the third stage meets the sixth transition condition, the maintenance will end.

[0030] Preferably, the preset level includes at least two temperature ranges and their corresponding battery remaining power thresholds.

[0031] Preferably, in the second maintenance strategy, the fourth transition condition, the fifth transition condition, and the sixth transition condition correspond to the battery charging time thresholds during the first, second, and third stages of maintenance, respectively.

[0032] A maintenance system for low-voltage batteries in new energy vehicles, comprising:

[0033] Information acquisition module, the information acquisition module is used to acquire battery parameters and new energy vehicle status;

[0034] The information processing module determines the battery maintenance needs based on preset trigger conditions and battery parameters; determines the new energy vehicle status that meets the new energy vehicle support maintenance type for battery maintenance; and determines the battery maintenance strategy based on the preset trigger condition type and the new energy vehicle support maintenance type.

[0035] The power battery performs maintenance on the storage battery according to the second maintenance strategy;

[0036] A discharge load, which is used to assist the battery in discharging.

[0037] Preferably, the battery parameters include: battery charge value and charge change rate within a specified time range.

[0038] Preferably, the preset trigger condition type includes a first trigger condition and a second trigger condition.

[0039] Wherein, the first triggering condition is that the battery value is less than a first battery threshold and the rate of change of battery within a first time range is greater than a first rate of change threshold; and the second triggering condition is that the rate of change of battery within a second time range is less than a second rate of change threshold.

[0040] When the battery parameters meet the first or second trigger condition, it is determined that the battery needs maintenance.

[0041] Preferably, the new energy vehicle status includes: the new energy vehicle gear status, the power battery gear status, the charger working status, and the power battery charge level.

[0042] Preferably, the maintenance types supported by the new energy vehicles include:

[0043] The first type is when the new energy vehicle is in P gear, the power battery is in OFF gear, the charger is not connected, and the power battery charge meets the first preset threshold.

[0044] The second type is when the new energy vehicle is in P gear, the power battery gear is in OFF gear, the charger is in connected charging state, and the power battery charge meets the second preset threshold.

[0045] The third type is when the new energy vehicle is not in P gear, the power battery is in ON gear, the charger is in ready state, and the power battery charge meets the third preset threshold.

[0046] Preferably, the first preset threshold is less than the second preset threshold, and the second preset threshold is less than the third preset threshold.

[0047] Preferably, the maintenance strategy types include:

[0048] The first maintenance strategy is adopted when the battery meets the first triggering condition and the new energy vehicle supports maintenance type one, two, or three; and

[0049] The second maintenance strategy is adopted when the battery meets the second triggering condition and the new energy vehicle supports the first, second or third type of maintenance.

[0050] Preferably, the first maintenance strategy adopts a slow-fast-slow three-step trickle charging method, dividing the maintenance stage into a first stage, a second stage, and a third stage, wherein the charging power of the first stage and the third stage is less than the charging power of the second stage.

[0051] If the maintenance process in the first stage meets the first transition condition, it will proceed to the second stage; if the maintenance process in the second stage meets the second transition condition, it will proceed to the third stage; and if the maintenance process in the third stage meets the third transition condition, the maintenance will end.

[0052] Preferably, in the first maintenance strategy, the first transition condition, the second transition condition, and the third transition condition correspond to the battery's power increment threshold / charging time threshold, power threshold, and power threshold / charging time threshold during the first, second, and third stages of the maintenance process, respectively.

[0053] Preferably, the second maintenance strategy adopts a full discharge and full charge maintenance method. After the battery temperature and charge reach a preset level through a discharge load, the maintenance stage is divided into a first stage, a second stage and a third stage. The charging power of the first stage and the third stage is less than the charging power of the second stage.

[0054] If the maintenance process in the first stage meets the fourth transition condition, it will proceed to the second stage; if the maintenance process in the second stage meets the fifth transition condition, it will proceed to the third stage; if the maintenance process in the third stage meets the sixth transition condition, the maintenance will end.

[0055] Preferably, the preset level includes at least two temperature ranges and their corresponding battery remaining power thresholds.

[0056] Preferably, in the second maintenance strategy, the fourth transition condition, the fifth transition condition, and the sixth transition condition correspond to the battery charging time thresholds during the first, second, and third stages of maintenance, respectively.

[0057] A new energy vehicle includes a maintenance system for the low-voltage battery of the new energy vehicle.

[0058] The beneficial effects of this invention are:

[0059] (1) Optimize the battery maintenance strategy type: The solution determines the maintenance strategy type based on the preset trigger conditions of the battery and the maintenance types supported by new energy vehicles, thereby making battery maintenance more targeted. This strategy not only considers the state of the battery, but also takes into account the specific situation of new energy vehicles, making it more comprehensive and accurate.

[0060] (2) Ensure vehicle operation stability: This solution ensures that the battery discharge and charging current reaches the preset target value by real-time monitoring and adjustment, thereby ensuring stable power supply to the vehicle and normal operation of the vehicle.

[0061] (3) Considering the health status of the battery and environmental factors: When determining whether to initiate a maintenance procedure and selecting the type of maintenance strategy, the plan comprehensively considers factors such as the health status of the battery, the type of vehicle, and the vehicle's hardware conditions. Furthermore, in the full discharge and full charge maintenance method, the battery temperature and remaining charge are also taken into account.

[0062] (4) Minimize the impact on other vehicle functions: When performing maintenance, the solution will minimize the impact on other vehicle functions. For example, in the full discharge and full charge maintenance method, the maintenance procedure will only be started after certain conditions are met.

[0063] (5) Easy to implement: The whole solution is clear and easy to understand, the process design is reasonable, and it is widely adaptable. It can be applied to a variety of different types and states of batteries, making it easy to implement.

[0064] (6) Improve battery charging and discharging efficiency: The constant current charging model and staged charging design of the scheme help improve the charging efficiency of the battery. At the same time, the constant current discharging model helps improve the discharging efficiency of the battery. Attached Figure Description

[0065] Figure 1 This is a schematic diagram of the maintenance method of the present invention;

[0066] Figure 2 This is a schematic diagram illustrating the maintenance strategy types of the present invention;

[0067] Figure 3 This is a block diagram of the maintenance system of the present invention;

[0068] Figure 4 This is a schematic diagram of the maintenance system of the present invention. Detailed Implementation

[0069] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0070] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0071] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0072] When using expressions such as "at least one of A, B, and C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). Similarly, when using expressions such as "at least one of A, B, or C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.).

[0073] The accompanying drawings illustrate several block diagrams and / or flowcharts. It should be understood that some blocks, or combinations thereof, in the block diagrams and / or flowcharts can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that, when executed by the processor, these instructions can create means for implementing the functions / operations described in these block diagrams and / or flowcharts. The technology of this disclosure can be implemented in hardware and / or software (including firmware, microcode, etc.). Alternatively, the technology of this disclosure can take the form of a computer program product stored on a computer-readable storage medium, which is available for use by or in conjunction with an instruction execution system.

[0074] like Figures 1-2 As shown, a maintenance method for a low-voltage battery in a new energy vehicle includes:

[0075] The maintenance needs of the battery are determined based on preset trigger conditions and battery parameters.

[0076] Determine if the status of the new energy vehicle meets the maintenance type supported by the new energy vehicle for battery maintenance.

[0077] The maintenance strategy for the battery is determined based on the preset trigger condition type and the maintenance type supported by new energy vehicles.

[0078] The term "battery" as used in this invention refers to low-voltage batteries used in new energy vehicles.

[0079] This invention determines whether the battery requires maintenance based on preset trigger conditions and battery parameters. Secondly, it determines whether the current state of the new energy vehicle is suitable for maintenance. Then, based on the type of preset trigger conditions and the types of maintenance the vehicle can support, it determines the most suitable battery maintenance strategy.

[0080] This approach allows us to tailor battery maintenance strategies to specific circumstances, rather than rigidly adhering to fixed rules. This leads to more effective battery maintenance, extends battery life, and improves the performance and efficiency of new energy vehicles.

[0081] Preferably, the battery parameters include: battery charge value and charge change rate within a specified time range.

[0082] This invention assesses the condition and performance of a battery by evaluating its parameters, thereby determining whether maintenance is required.

[0083] For example, assuming a specified time range is 24 hours, the battery charge change rate refers to the change in battery charge within those 24 hours. If the battery charge change is small within this time range, it indicates that the battery is relatively stable. However, a large charge change rate may indicate abnormal power consumption or other problems with the battery.

[0084] By monitoring the battery's charge level and the rate of charge change within a specified time range, we can understand the battery's operating status and performance. If the charge level drops significantly in a short period of time, or the rate of charge change exceeds a certain threshold, this may indicate a problem with the battery and require maintenance. Such monitoring and evaluation can help us promptly detect abnormalities in the battery and take appropriate maintenance measures, thereby ensuring the normal operation of the battery and extending its service life.

[0085] Preferably, the preset trigger condition type includes a first trigger condition and a second trigger condition.

[0086] Wherein, the first triggering condition is that the battery value is less than a first battery threshold and the rate of change of battery within a first time range is greater than a first rate of change threshold; and the second triggering condition is that the rate of change of battery within a second time range is less than a second rate of change threshold.

[0087] When the battery parameters meet the first or second trigger condition, it is determined that the battery needs maintenance.

[0088] The first trigger condition for battery maintenance is an abnormally rapid drop in deep discharge. The determination method is to compare the rate of change of charge and the current charge value within a specified time range (e.g., 24 hours) with the first rate of change threshold and the first charge threshold, respectively. For example, if the first rate of change threshold is 30% and the first charge threshold is 50%, then: ΔSOC / 24H decrease ≥30% and SOC≤50%. If both of the above conditions are met simultaneously, the first trigger condition is satisfied.

[0089] The second trigger condition for battery maintenance is normal gradual degradation through deep charging and shallow discharging. The determination method is to compare the rate of change of charge within a second time range (e.g., 24 hours) and the duration (e.g., 180 days) with a second rate of change threshold. For example, if the second rate of change threshold is 10% and the duration is 180 days, then: ΔSOC / 24H decrease ≤ 10% and the duration is ≥ 180 days. If both of the above conditions are met, the second trigger condition is satisfied.

[0090] If the battery meets one of the two triggering conditions mentioned above, it is determined that the battery currently meets the maintenance requirements and can be maintained.

[0091] For example: set the first time range to 24 hours, the first battery capacity threshold to 50%, and the first rate of change threshold to 30%. If the battery capacity drops by more than 30% within 24 hours and the current capacity is below 50%, then the first trigger condition is met, indicating that the battery has experienced an abnormally rapid drop in deep discharge.

[0092] In addition, the second time range is set to 24 hours, the second rate of change threshold is 10%, and the duration is 180 days. If the battery's charge decreases by less than or equal to 10% within 24 hours and this continues for 180 days, then the second trigger condition is met, indicating that the battery has undergone normal gradual degradation through deep charging and shallow discharging.

[0093] By setting different trigger conditions and thresholds, it is possible to determine whether a battery requires maintenance. The first trigger condition is used to detect abnormally rapid decline in deep discharge, while the second trigger condition is used to detect normal, gradual degradation during deep charging and shallow discharging. When the battery meets either of these two trigger conditions, the system can determine that the battery currently meets maintenance requirements and needs to undergo corresponding maintenance operations.

[0094] This trigger-based determination method can more accurately assess the battery's maintenance needs and perform corresponding maintenance operations based on the battery's actual condition. This avoids premature or delayed maintenance, improving battery life and performance while reducing unnecessary maintenance costs.

[0095] Preferably, the new energy vehicle status includes: the new energy vehicle gear status, the power battery gear status, the charger working status, and the power battery charge level.

[0096] The status information of new energy vehicles is used to determine whether new energy vehicles meet the conditions for battery maintenance.

[0097] For example: the gear positions of new energy vehicles can be divided into P (parked) and non-P (driving). The gear positions of the power battery can be divided into OFF (not working) and ON (working). The working status of the charger can be divided into disconnected and connected charging. The power battery's charge level can be expressed as a percentage, for example, 80% means the charge level is 80%.

[0098] By monitoring various status information of new energy vehicles, it can be determined whether the conditions for battery maintenance are met. This status information reflects the actual working condition of the vehicle and battery, playing a crucial role in determining maintenance needs.

[0099] For example, when a new energy vehicle is in Park (P) gear, the power battery is in Off (OFF) gear, the charger is not connected, and the power battery charge meets a preset threshold, this can be considered a first-type maintenance entry condition. This means the vehicle is parked, the power battery is not working and is not connected to a charger, and the battery charge meets maintenance requirements. Based on different types of maintenance entry conditions, corresponding maintenance strategies can be developed.

[0100] This vehicle condition-based determination method can more accurately determine whether a new energy vehicle is suitable for battery maintenance, formulate the best maintenance plan according to the actual situation of the vehicle, improve the performance and life of the battery, and ensure the normal operation of the vehicle.

[0101] Preferably, the maintenance types supported by the new energy vehicles include:

[0102] The first type is when the new energy vehicle is in P gear, the power battery is in OFF gear, the charger is not connected, and the power battery charge meets the first preset threshold, for example, the power battery charge is ≥40%, then the first type of entry condition is met.

[0103] The second type is when the new energy vehicle is in P gear, the power battery is in OFF gear, the charger is in connected charging mode, and the power battery charge meets the second preset threshold, for example, the power battery charge is ≥30%, then the second type of entry conditions are met.

[0104] The third type is when the new energy vehicle is not in P gear, the power battery is in ON gear, the charger is in READY state, and the power battery charge meets the third preset threshold, such as power battery charge ≥ 50%.

[0105] If the status of a new energy vehicle meets the above three types, it is determined that the current new energy vehicle supports battery maintenance.

[0106] This invention categorizes new energy vehicles into different maintenance types based on their various states, including vehicle gear position, power battery gear position, charger operating status, and power battery charge level. Battery maintenance can only be performed when the new energy vehicle's state meets specific conditions.

[0107] For example, the conditions for entering the first type of maintenance are: the new energy vehicle is in P gear, the power battery is in OFF gear, the charger is not connected, and the power battery charge meets the first preset threshold (e.g., charge ≥ 40%). This means that the vehicle is parked, the power battery is not working, it is not connected to a charger, and the battery charge is sufficient.

[0108] By determining whether the condition of a new energy vehicle meets the entry conditions for different types of maintenance, it can be determined whether the vehicle supports battery maintenance. Different maintenance types reflect the feasibility of the vehicle under different conditions, so as to formulate an appropriate maintenance strategy for the vehicle.

[0109] For example, when a new energy vehicle is in P gear, the power battery is in OFF gear, the charger is not connected, and the power battery charge meets a first preset threshold, it can be determined that the first type of maintenance entry condition has been met. This means that the vehicle is parked, the battery is not working, not connected to a charger, and has sufficient charge to meet the conditions for maintenance.

[0110] By determining the type of maintenance required based on the vehicle's condition, it's possible to ensure that maintenance is performed appropriately, improving its effectiveness and impact. This guarantees battery performance and lifespan, and optimizes the overall operating status of new energy vehicles.

[0111] Preferably, the first preset threshold is less than the second preset threshold, and the second preset threshold is less than the third preset threshold.

[0112] This invention provides an effective judgment mechanism by setting reasonable preset thresholds to ensure the order and magnitude relationship between thresholds. This has the following effects:

[0113] This ensures the reasonableness and logic of the thresholds. By setting different thresholds, the battery's condition and maintenance needs can be determined more accurately.

[0114] It provides multiple levels of judgment criteria. Due to the increasing relationship between the thresholds, different maintenance strategies and measures can be determined based on different battery charge levels.

[0115] The maintenance plan has been optimized for greater flexibility. By setting appropriate thresholds, it can be adjusted and optimized according to actual needs to adapt to the battery maintenance requirements of different vehicles and usage conditions.

[0116] In summary, by setting reasonable preset thresholds and maintaining their relative magnitudes, the accuracy and reliability of battery maintenance programs can be improved, further optimizing battery performance and lifespan.

[0117] Preferably, the maintenance strategy types include:

[0118] The first maintenance strategy is adopted when the battery meets the first triggering condition and the new energy vehicle supports maintenance type one, two, or three; and

[0119] The second maintenance strategy is adopted when the battery meets the second triggering condition and the new energy vehicle supports the first, second or third type of maintenance.

[0120] This invention includes selection principles for two maintenance strategy types. The appropriate maintenance strategy type is determined based on the triggering conditions met by the battery and the maintenance types supported by the new energy vehicle.

[0121] For example, when the battery meets the first trigger condition (abnormally rapid drop in deep discharge) and the maintenance type supported by the new energy vehicle is the first type (P gear, OFF gear, no charging connection, battery level ≥ 40%), the first maintenance strategy (slow-fast-slow three-step trickle charging method) is adopted.

[0122] In addition, when the battery meets the second triggering condition (normal gradual decay of deep charge and shallow discharge) and the maintenance type supported by the new energy vehicle is the third type (not in P gear, ON gear, ready state, battery level ≥ 50%), the second maintenance strategy is adopted.

[0123] By selecting the appropriate maintenance strategy type based on the triggering conditions and the maintenance types supported by new energy vehicles, the following effects can be achieved:

[0124] Precise matching of maintenance strategy types: Based on the specific condition of the battery and the type of new energy vehicle it supports, the most suitable maintenance strategy type is selected. This ensures accurate and targeted battery maintenance, improving maintenance effectiveness and efficiency.

[0125] Adapt to actual conditions: Determine the optimal maintenance strategy based on the specific condition of the battery and the type of new energy vehicle it supports. This allows for the selection of the most suitable maintenance method based on actual circumstances, maximizing battery life and performance.

[0126] Flexibility and adaptability: The system allows for flexible adaptation to different battery conditions and vehicle characteristics, based on matching triggering conditions and maintenance types. This helps improve battery performance and lifespan while reducing unnecessary maintenance operations and resource waste.

[0127] In summary, selecting the appropriate maintenance strategy based on the triggering conditions met by the battery and the maintenance types supported by new energy vehicles can improve the accuracy and effectiveness of maintenance.

[0128] Preferably, the first maintenance strategy adopts a slow-fast-slow three-step trickle charging method, dividing the maintenance stage into a first stage, a second stage, and a third stage, wherein the charging power of the first stage and the third stage is less than the charging power of the second stage.

[0129] In one embodiment, the first maintenance strategy implementation steps are as follows:

[0130] The first step is to use a low-current constant-current slow charging method, with the battery charging current Ib set as the target current based on the battery's 20-hour rate discharge current I20 (capacity / 20).

[0131] Establish a charging current balance calculation model: Ib=(Ud*Id-Uf*If) / Ub*T

[0132] For example, the target current of a 60AH battery is Ib = 60 / 20 = 3A, Ud is the output voltage of the DC-DC converter, Id is the output current of the DC-DC converter, Uf is the load operating voltage, If is the load operating current, and T is the temperature compensation coefficient (1 for 0°C and above, increasing by 0.2 for every 5°C decrease).

[0133] The difference between the target current and the actual current is calculated by comparing the real-time current value Ibs collected by the battery sensor with the target current Ib. Ib-Ibs=△Ibb.

[0134] When ΔIbb≥0, the DC-DC converter increases the output current Id=Id+ΔIbb, making the actual charging current Ibs of the battery infinitely close to the target current Ib;

[0135] When ΔIbb < 0, the DC-DC converter reduces the output current Id = Id - ΔIbb, making the actual charging current Ibs of the battery infinitely close to the target current Ib.

[0136] The second step is: the fast charging method adopts constant voltage and unlimited current charging, and the target value of the battery charging voltage is set to Ub (e.g., 14.2V at 0°C and above, and 0.1V for every 5°C decrease).

[0137] The voltage value Ubs collected in real time by the battery sensor is compared with the target voltage Ub, and the difference between the target voltage and the actual voltage is calculated as Ub-Ubs=△Ubb;

[0138] When ΔUbb≥0, the DC-DC converter increases the output voltage Ud=Ud+ΔUbb, making the actual charging voltage Ubs of the battery infinitely close to the target voltage Ub.

[0139] When ΔUbb < 0, the DC-DC converter reduces the output voltage Ud = Ud - ΔUbb, making the actual charging voltage Ubs of the battery infinitely close to the target voltage Ub.

[0140] The third step is: slow charging method using step-down constant voltage charging, the target value of battery charging voltage is set to Ub (e.g. 13.5V at 0°C and above, increasing by 0.1V for every 5°C decrease), the output power of DCDC is not limited, and the DCDC output voltage control method is consistent with the second step;

[0141] If the maintenance process in the first stage meets the first transition condition, it will proceed to the second stage; if the maintenance process in the second stage meets the second transition condition, it will proceed to the third stage; and if the maintenance process in the third stage meets the third transition condition, the maintenance will end.

[0142] The first maintenance strategy employs a slow-fast-slow three-step trickle charging method, using different charging methods and target parameters to maintain the battery. In each stage, based on the battery's condition and target current / voltage settings, the output current and voltage of the DC-DC converter are adjusted to bring the actual charging current and voltage of the battery close to the target values, thereby completing the maintenance process.

[0143] For example, suppose the battery capacity is 60AH, the target current is set to 3A, and the target voltage is set to 14.2V. In the first step of low-current constant-current slow charging, the output current of the DC-DC converter is adjusted by comparing the real-time current value collected by the battery with the target current to make the actual charging current close to the target current. If the actual current is greater than the target current, the output current of the DC-DC converter is increased; if the actual current is less than the target current, the output current of the DC-DC converter is decreased.

[0144] This slow-fast-slow charging method allows for control of battery charging power at different stages. The first stage uses low-current constant-current slow charging, the second stage uses fast-charging constant-voltage charging, and the third stage uses slow-charging step-down constant-voltage charging. This maintenance strategy better meets the battery's charging needs and improves maintenance effectiveness. By performing deep charge-discharge and constant-current / constant-voltage charging, the battery's state of charge can be optimized, improving its lifespan and performance.

[0145] In general, the primary maintenance strategy can employ different charging methods and parameter controls based on the specific condition of the battery and the target current / voltage settings to achieve precise battery maintenance. This will effectively extend the battery's lifespan and improve its performance and reliability.

[0146] Preferably, in the first maintenance strategy, the first transition condition, the second transition condition, and the third transition condition correspond to the battery's power increment threshold / charging time threshold, power threshold, and power threshold / charging time threshold during the first, second, and third stages of the maintenance process, respectively.

[0147] In one embodiment, the first transition condition, such as the end point of slow charging, is determined by the incremental threshold ΔSOC of the battery charge (real-time charge) or the continuous charging time threshold t, such as ΔSOC≥10% or t≥3600S.

[0148] The second transition condition is determined, for example, by the battery charge (real-time charge) SOC reaching the charge increment threshold (e.g., SOC≥80);

[0149] The third transition condition, such as the end point of slow charging, is determined by the SOC reaching the power threshold or the continuous charging time threshold t. For example, if SOC ≥ 95% or t ≥ 3600S, the maintenance is confirmed to be completed and the maintenance mode is exited.

[0150] By setting appropriate transition conditions, the switching between different stages during maintenance can be effectively controlled. When the battery's charge increment or charging time reaches a set threshold, the completion status of the maintenance stage can be accurately determined, and the process can smoothly proceed to the next stage. This ensures that the battery receives appropriate charging at different stages to achieve optimal maintenance results.

[0151] Overall, these transition conditions provide a flexible way to determine the completion status of different stages during maintenance. By setting appropriate power increment thresholds / charging time thresholds and power thresholds, judgments can be made based on the actual condition of the battery, ensuring that the battery is fully charged during maintenance to achieve good maintenance results.

[0152] Preferably, the second maintenance strategy adopts a full discharge and full charge maintenance method. After the battery temperature and charge reach a preset level through a discharge load, the maintenance stage is divided into a first stage, a second stage and a third stage. The charging power of the first stage and the third stage is less than the charging power of the second stage.

[0153] If the maintenance process in the first stage meets the fourth transition condition, it will proceed to the second stage; if the maintenance process in the second stage meets the fifth transition condition, it will proceed to the third stage; if the maintenance process in the third stage meets the sixth transition condition, the maintenance will end.

[0154] In one embodiment, the implementation steps of the second maintenance strategy are as follows:

[0155] The first step is to use constant current discharge. The target constant current discharge current Ib of the battery is set according to the 20-hour rate discharge current I20 (capacity / 20). For example, the target discharge current Ib of a 60AH battery is 60 / 20 = 3A.

[0156] According to the charge / discharge current balance calculation model, Ib = (Ud*Id - Uf*If) / Ub*T

[0157] When the first or second type of trigger condition is initiated, the DC-DC output current Id is 0, and the air conditioner blower is turned on as the load discharge current If.

[0158] The difference between the target current and the actual current is calculated by comparing the real-time current value Ibs collected by the battery sensor with the target current Ib. Ib-Ibs=△Ibb.

[0159] When ΔIbb≥0, control the working current of the blower If=If-ΔIbb, so that the actual discharge current Ibs of the battery is infinitely close to the target current Ib;

[0160] When ΔIbb < 0, control the working current of the blower If = If + ΔIbb, so that the actual discharge current Ibs of the battery is infinitely close to the target current Ib.

[0161] When the third type of activation enters the second trigger condition, the dynamic variable of the vehicle electrical load current If is adjusted by regulating the DC-DC output current Id to make the battery discharge current Ib reach a balance and stability.

[0162] The difference between the target current and the actual current is calculated by comparing the real-time current value Ibs collected by the battery sensor with the target current Ib. Ib-Ibs=△Ibb.

[0163] When ΔIbb≥0, control the DC-DC output current to decrease Id=Id-ΔIbb, so that the actual discharge current Ibs of the battery is infinitely close to the target current Ib.

[0164] When ΔIbb < 0, control the DCDC output current to increase Id = Id + ΔIbb, so that the actual discharge current Ibs of the battery is infinitely close to the target current Ib;

[0165] The second step is constant current charging. The charging model is based on Ib = (Ud*Id - Uf*If) / Ub*T, and the process is divided into three steps.

[0166] The first stage uses a constant current charging method of 0.05 * C20 for 8 hours; for example, the target current Ib for a 60AH battery is 0.05 * 60 = 3A.

[0167] The second stage uses a constant current charging method of 0.1*C20 for 8 hours; for example, the target current Ib for a 60AH battery is 0.1*60 = 6A.

[0168] The third stage uses a constant current charging method of 0.05*C20 for 2 hours; for example, the target current Ib for a 60AH battery is 0.05*60 = 3A.

[0169] The target current for constant current charging is set as above. Based on the current value collected in real time by the battery sensor, the output current of the DC-DC converter is controlled to make the battery charging current reach a balanced and stable state.

[0170] The end point of the second step, constant current charging, is determined according to the three segmented charging time thresholds. Once these thresholds are reached, the maintenance is confirmed to be complete, and the maintenance mode is exited.

[0171] The second maintenance strategy employs a full discharge and full charge method. After the battery's temperature and charge reach a preset level through a discharge load, the maintenance process is divided into three stages: Stage 1, Stage 2, and Stage 3. The charging power in Stage 1 and Stage 3 is lower than that in Stage 2. During implementation, the discharge load or DC-DC output current is controlled based on the difference between the battery's real-time current and the target current, ensuring that the actual battery discharge current closely approximates the target current.

[0172] For example, the first step is the constant current discharge stage, where the target constant current discharge current Ib is set based on the battery's 20-hour rate discharge current I20 (capacity / 20). By comparing the difference between the actual current and the target current ΔIbb, the blower operating current If or the DC-DC output current Id is controlled to make the battery's actual discharge current infinitely close to the target current Ib. The second step is the constant current charging stage, where segmented charging is performed according to the set charging time and current value. Based on the difference between the battery's real-time current and the target current ΔIbb, the DC-DC output current Id is controlled to make the battery charging current reach a balanced and stable state.

[0173] The second maintenance strategy achieves battery maintenance through two stages: constant current discharge and constant current charging. In the constant current discharge stage, the actual discharge current of the battery is brought as close as possible to the target current by controlling the discharge load or the DC-DC output current, thus achieving a maintenance effect. In the constant current charging stage, segmented charging is performed according to the set charging time and current value, and the battery charging current is balanced and stable by controlling the DC-DC output current.

[0174] In general, the second maintenance strategy maintains the battery through a full discharge and full charge process, achieving the desired maintenance effect by precisely controlling the current during discharge and charging. This ensures that the battery receives appropriate discharge and charge during maintenance to maintain its performance and lifespan. Furthermore, by dividing the maintenance process into different stages and setting different charging times and current values, precise adjustments can be made according to the battery's actual condition and needs to achieve optimal maintenance results.

[0175] The advantage of this full-discharge-full-charge maintenance method lies in its more comprehensive battery maintenance, taking into account both the battery's temperature and charge level. The control strategies for the discharge load and constant-current charging stages can be dynamically adjusted based on the battery's real-time status to meet maintenance needs. By dividing the maintenance process into different stages and setting different charging power according to the stage requirements, the battery charging process can be controlled more effectively, ensuring its safety and stability.

[0176] For example, if the battery triggers maintenance conditions and meets the requirements of the second maintenance strategy, according to the steps in the embodiment, a constant current discharge stage is first performed. If the actual discharge current of the battery deviates from the target current, the blower operating current is controlled or the DC-DC output current is adjusted to bring it closer to the target current. Next is the constant current charging stage, where charging is performed in segments according to the set charging time and current value. By controlling the DC-DC output current, the battery charging current is made to reach a balanced and stable state, and the charging process is judged to be complete according to the charging time threshold set for each stage.

[0177] This type of maintenance strategy ensures that the battery receives proper handling during charging and discharging, eliminating the risk of overcharging or over-discharging and extending battery life. Furthermore, dynamically adjusting the current during charging and discharging based on actual conditions better adapts to the characteristics and needs of different batteries, improving maintenance effectiveness and efficiency.

[0178] In summary, the second maintenance strategy employs a full discharge and full charge method. By precisely controlling the current and charging time during the discharge and charging processes, comprehensive and effective battery maintenance can be achieved. This strategy considers important parameters such as battery temperature and charge level, and dynamically adjusts them according to actual conditions to achieve optimal maintenance results, extend battery life, and improve the performance and reliability of new energy vehicles.

[0179] Preferably, the preset level includes at least two temperature ranges and their corresponding battery remaining power thresholds.

[0180] In one embodiment, the preset levels include:

[0181] The first tier, with temperatures above 0°C set at 10%;

[0182] The second tier, with temperatures at or below 0°C, is set at 15%.

[0183] The third tier, with temperatures of -18℃ and below, is set at 20%.

[0184] The fourth level, -30℃ and below, is set at 25%.

[0185] This invention, by classifying batteries into different grades, can determine the maintenance needs of batteries based on changes in temperature and charge, and take corresponding maintenance measures.

[0186] For example, in one embodiment, the preset levels are divided into four levels, each with different thresholds set for different temperature ranges and remaining battery power. The first level is for temperature ranges above 0°C, with a remaining battery power threshold set at 10%. The second level is for temperature ranges of 0°C and below, with a remaining battery power threshold set at 15%. The third level is for temperature ranges of -18°C and below, with a remaining battery power threshold set at 20%. The fourth level is for temperature ranges of -30°C and below, with a remaining battery power threshold set at 25%.

[0187] Such preset levels can set maintenance trigger conditions and corresponding maintenance strategies based on the battery's remaining charge under different temperature conditions. For example, the battery's remaining charge threshold is set higher at lower temperatures because low temperatures affect battery performance, and a higher remaining charge is needed to ensure the battery operates normally in low-temperature environments.

[0188] By setting preset levels, the maintenance needs of the battery can be determined based on changes in temperature and remaining charge, and corresponding maintenance measures can be taken. This ensures stable operation of the battery under different temperature conditions, extends its service life, and improves the performance and reliability of new energy vehicles.

[0189] In summary, the preset maintenance levels are based on temperature ranges and the remaining battery charge threshold to determine the battery's maintenance needs. By appropriately setting different thresholds, a secondary maintenance strategy can be determined based on changes in temperature and remaining charge, ensuring the battery's normal operation in different environments and extending its lifespan.

[0190] Preferably, in the second maintenance strategy, the fourth transition condition, the fifth transition condition, and the sixth transition condition correspond to the battery charging time thresholds during the first, second, and third stages of maintenance, respectively.

[0191] As in the second step of the above embodiment,

[0192] The first segment uses a charging time threshold of 8 hours;

[0193] The second stage uses a charging time threshold of 8 hours;

[0194] The third segment uses a charging time threshold of 2 hours.

[0195] The transition conditions in the second maintenance strategy are determined by charging time thresholds to switch between different stages of the battery maintenance process. The transition conditions for each stage are determined based on the set charging time thresholds, which then decide whether to proceed to the next stage.

[0196] For example, in one embodiment, the second step of the second maintenance strategy is divided into three stages, each using a different charging time threshold. The charging time threshold for the first stage is set to 8 hours, the charging time threshold for the second stage is also 8 hours, and the charging time threshold for the third stage is 2 hours.

[0197] This setting means that during the implementation of the second maintenance strategy, when the battery is charging, the actual charging time is compared with the set threshold to determine whether the transition conditions are met, and thus decide whether to proceed to the next stage of the maintenance process.

[0198] For example, during the first stage of maintenance, if the battery charging time exceeds the set threshold of 8 hours, the fourth transition condition is met, and the second stage of maintenance can proceed. Similarly, during the second and third stages of maintenance, whether the charging time reaches the corresponding threshold is used to determine whether the transition condition is met, thus deciding whether to proceed to the next stage of maintenance.

[0199] By setting different charging time thresholds, the maintenance process can be controlled based on the charging time during battery maintenance. This ensures that the battery is fully charged at different stages of maintenance and switches according to the set time thresholds to achieve a full discharge and full charge maintenance effect.

[0200] In summary, the transition conditions in the second maintenance strategy are based on charging time thresholds to determine the process switching during battery maintenance. By setting charging time thresholds for different stages, the actual charging time can be compared with the set thresholds to determine whether the transition conditions are met and whether to proceed to the next stage of the maintenance process. This ensures that the battery receives adequate charging during maintenance and switches maintenance processes according to the set time thresholds, achieving a full discharge and full charge maintenance effect.

[0201] like Figures 3-4 As shown, a maintenance system for a low-voltage battery in a new energy vehicle includes:

[0202] Information acquisition module, the information acquisition module is used to acquire battery parameters and new energy vehicle status;

[0203] The information processing module determines the battery maintenance needs based on preset trigger conditions and battery parameters; determines the new energy vehicle status that meets the new energy vehicle support maintenance type for battery maintenance; and determines the battery maintenance strategy based on the preset trigger condition type and the new energy vehicle support maintenance type.

[0204] The power battery performs maintenance on the storage battery according to the second maintenance strategy;

[0205] A discharge load, which is used to assist the battery in discharging.

[0206] The maintenance system also includes: a charger, a DC-DC converter, a VCU controller, a battery, and a battery sensor. The DC-DC converter is connected in parallel with the battery and the discharge load, the battery sensor is connected to the battery, and the VCU controller is connected to the signals of the battery sensor and the DC-DC converter.

[0207] The maintenance system of this invention acquires information on the battery and vehicle status through an information acquisition module, determines maintenance needs based on preset trigger conditions and parameters through an information processing module, and determines the maintenance strategy type. The power battery and discharge load cooperate to perform charging and discharging processes to achieve the purpose of battery maintenance.

[0208] The coordinated operation of the entire maintenance system ensures that the battery is charged and discharged according to the set maintenance strategy, thereby maintaining battery performance and extending its lifespan. Simultaneously, through information acquisition and processing, the system can adjust the maintenance strategy based on real-time status, achieving precise battery charge and discharge control to meet maintenance needs under different conditions. The advantages of this maintenance system lie in its intelligent maintenance strategy types and system components, enabling effective battery maintenance based on actual conditions.

[0209] For example, when the battery parameters and the status of the new energy vehicle meet preset trigger conditions, the information processing module determines that maintenance is required. Based on the set maintenance strategy type, the power battery performs charging maintenance according to specific stages and conditions by controlling the charging current and voltage. A discharge load assists in completing the discharge process. Through precise control of the charging and discharging processes, the maintenance system can achieve effective maintenance and management of the battery, extend its service life, and improve the performance and reliability of the entire new energy vehicle system.

[0210] Furthermore, the battery maintenance system is scalable and flexible. By setting different preset levels, different maintenance requirements can be determined based on different temperature ranges and the battery's remaining charge threshold. The system can be adjusted and expanded according to actual needs to adapt to different models and specifications of new energy vehicles and batteries.

[0211] Overall, the maintenance system for low-voltage batteries in new energy vehicles of this invention employs intelligent information acquisition, processing, and control methods to achieve regular battery maintenance through charge and discharge control. It can determine the optimal maintenance strategy type based on preset trigger conditions, battery parameters, and the state of the new energy vehicle, and complete the charging and discharging process through the power battery and discharge load. Such a system can improve the battery's lifespan and performance, while simultaneously enhancing the reliability and efficiency of new energy vehicles.

[0212] Preferably, the battery parameters include: battery charge value and charge change rate within a specified time range.

[0213] This invention assesses the condition and performance of a battery by evaluating its parameters, thereby determining whether maintenance is required.

[0214] For example, assuming a specified time range is 24 hours, the battery charge change rate refers to the change in battery charge within those 24 hours. If the battery charge change is small within this time range, it indicates that the battery is relatively stable. However, a large charge change rate may indicate abnormal power consumption or other problems with the battery.

[0215] By monitoring the battery's charge level and the rate of charge change within a specified time range, we can understand the battery's operating status and performance. If the charge level drops significantly in a short period of time, or the rate of charge change exceeds a certain threshold, this may indicate a problem with the battery and require maintenance. Such monitoring and evaluation can help us promptly detect abnormalities in the battery and take appropriate maintenance measures, thereby ensuring the normal operation of the battery and extending its service life.

[0216] Preferably, the preset trigger condition type includes a first trigger condition and a second trigger condition.

[0217] Wherein, the first triggering condition is that the battery value is less than a first battery threshold and the rate of change of battery within a first time range is greater than a first rate of change threshold; and the second triggering condition is that the rate of change of battery within a second time range is less than a second rate of change threshold.

[0218] When the battery parameters meet the first or second trigger condition, it is determined that the battery needs maintenance.

[0219] The first trigger condition for battery maintenance is an abnormally rapid drop in deep discharge. The determination method is to compare the rate of change of charge and the current charge value within a specified time range (e.g., 24 hours) with the first rate of change threshold and the first charge threshold, respectively. For example, if the first rate of change threshold is 30% and the first charge threshold is 50%, then: ΔSOC / 24H decrease ≥30% and SOC≤50%. If both of the above conditions are met simultaneously, the first trigger condition is satisfied.

[0220] The second trigger condition for battery maintenance is normal gradual degradation through deep charging and shallow discharging. The determination method is to compare the rate of change of charge within a second time range (e.g., 24 hours) and the duration (e.g., 180 days) with a second rate of change threshold. For example, if the second rate of change threshold is 10% and the duration is 180 days, then: ΔSOC / 24H decrease ≤ 10% and the duration is ≥ 180 days. If both of the above conditions are met, the second trigger condition is satisfied.

[0221] If the battery meets one of the two triggering conditions mentioned above, it is determined that the battery currently meets the maintenance requirements and can be maintained.

[0222] For example: set the first time range to 24 hours, the first battery capacity threshold to 50%, and the first rate of change threshold to 30%. If the battery capacity drops by more than 30% within 24 hours and the current capacity is below 50%, then the first trigger condition is met, indicating that the battery has experienced an abnormally rapid drop in deep discharge.

[0223] In addition, the second time range is set to 24 hours, the second rate of change threshold is 10%, and the duration is 180 days. If the battery's charge decreases by less than or equal to 10% within 24 hours and this continues for 180 days, then the second trigger condition is met, indicating that the battery has undergone normal gradual degradation through deep charging and shallow discharging.

[0224] By setting different trigger conditions and thresholds, it is possible to determine whether a battery requires maintenance. The first trigger condition is used to detect abnormally rapid decline in deep discharge, while the second trigger condition is used to detect normal, gradual degradation during deep charging and shallow discharging. When the battery meets either of these two trigger conditions, the system can determine that the battery currently meets maintenance requirements and needs to undergo corresponding maintenance operations.

[0225] This trigger-based determination method can more accurately assess the battery's maintenance needs and perform corresponding maintenance operations based on the battery's actual condition. This avoids premature or delayed maintenance, improving battery life and performance while reducing unnecessary maintenance costs.

[0226] Preferably, the new energy vehicle status includes: the new energy vehicle gear status, the power battery gear status, the charger working status, and the power battery charge level.

[0227] The status information of new energy vehicles is used to determine whether new energy vehicles meet the conditions for battery maintenance.

[0228] For example: the gear positions of new energy vehicles can be divided into P (parked) and non-P (driving). The gear positions of the power battery can be divided into OFF (not working) and ON (working). The working status of the charger can be divided into disconnected and connected charging. The power battery's charge level can be expressed as a percentage, for example, 80% means the charge level is 80%.

[0229] By monitoring various status information of new energy vehicles, it can be determined whether the conditions for battery maintenance are met. This status information reflects the actual working condition of the vehicle and battery, playing a crucial role in determining maintenance needs.

[0230] For example, when a new energy vehicle is in Park (P) gear, the power battery is in Off (OFF) gear, the charger is not connected, and the power battery charge meets a preset threshold, this can be considered a first-type maintenance entry condition. This means the vehicle is parked, the power battery is not working and is not connected to a charger, and the battery charge meets maintenance requirements. Based on different types of maintenance entry conditions, corresponding maintenance strategies can be developed.

[0231] This vehicle condition-based determination method can more accurately determine whether a new energy vehicle is suitable for battery maintenance, formulate the best maintenance plan according to the actual situation of the vehicle, improve the performance and life of the battery, and ensure the normal operation of the vehicle.

[0232] Preferably, the maintenance types supported by the new energy vehicles include:

[0233] The first type is when the new energy vehicle is in P gear, the power battery is in OFF gear, the charger is not connected, and the power battery charge meets the first preset threshold, for example, the power battery charge is ≥40%, then the first type of entry condition is met.

[0234] The second type is when the new energy vehicle is in P gear, the power battery is in OFF gear, the charger is in connected charging mode, and the power battery charge meets the second preset threshold, for example, the power battery charge is ≥30%, then the second type of entry conditions are met.

[0235] The third type is when the new energy vehicle is not in P gear, the power battery is in ON gear, the charger is in READY state, and the power battery charge meets the third preset threshold, such as power battery charge ≥ 50%.

[0236] If the status of a new energy vehicle meets the above three types, it is determined that the current new energy vehicle supports battery maintenance.

[0237] This invention categorizes new energy vehicles into different maintenance types based on their various states, including vehicle gear position, power battery gear position, charger operating status, and power battery charge level. Battery maintenance can only be performed when the new energy vehicle's state meets specific conditions.

[0238] For example, the conditions for entering the first type of maintenance are: the new energy vehicle is in P gear, the power battery is in OFF gear, the charger is not connected, and the power battery charge meets the first preset threshold (e.g., charge ≥ 40%). This means that the vehicle is parked, the power battery is not working, it is not connected to a charger, and the battery charge is sufficient.

[0239] By determining whether the condition of a new energy vehicle meets the entry conditions for different types of maintenance, it can be determined whether the vehicle supports battery maintenance. Different maintenance types reflect the feasibility of the vehicle under different conditions, so as to formulate an appropriate maintenance strategy for the vehicle.

[0240] For example, when a new energy vehicle is in P gear, the power battery is in OFF gear, the charger is not connected, and the power battery charge meets a first preset threshold, it can be determined that the first type of maintenance entry condition has been met. This means that the vehicle is parked, the battery is not working, not connected to a charger, and has sufficient charge to meet the conditions for maintenance.

[0241] By determining the type of maintenance required based on the vehicle's condition, it's possible to ensure that maintenance is performed appropriately, improving its effectiveness and impact. This guarantees battery performance and lifespan, and optimizes the overall operating status of new energy vehicles.

[0242] Preferably, the first preset threshold is less than the second preset threshold, and the second preset threshold is less than the third preset threshold.

[0243] This invention provides an effective judgment mechanism by setting reasonable preset thresholds to ensure the order and magnitude relationship between thresholds. This has the following effects:

[0244] This ensures the reasonableness and logic of the thresholds. By setting different thresholds, the battery's condition and maintenance needs can be determined more accurately.

[0245] It provides multiple levels of judgment criteria. Due to the increasing relationship between the thresholds, different maintenance strategies and measures can be determined based on different battery charge levels.

[0246] The maintenance plan has been optimized for greater flexibility. By setting appropriate thresholds, it can be adjusted and optimized according to actual needs to adapt to the battery maintenance requirements of different vehicles and usage conditions.

[0247] In summary, by setting reasonable preset thresholds and maintaining their relative magnitudes, the accuracy and reliability of battery maintenance programs can be improved, further optimizing battery performance and lifespan.

[0248] Preferably, the maintenance strategy types include:

[0249] The first maintenance strategy is adopted when the battery meets the first triggering condition and the new energy vehicle supports maintenance type one, two, or three; and

[0250] The second maintenance strategy is adopted when the battery meets the second triggering condition and the new energy vehicle supports the first, second or third type of maintenance.

[0251] This invention includes selection principles for two maintenance strategy types. The appropriate maintenance strategy type is determined based on the triggering conditions met by the battery and the maintenance types supported by the new energy vehicle.

[0252] For example, when the battery meets the first trigger condition (abnormally rapid drop in deep discharge) and the maintenance type supported by the new energy vehicle is the first type (P gear, OFF gear, no charging connection, battery level ≥ 40%), the first maintenance strategy (slow-fast-slow three-step trickle charging method) is adopted.

[0253] In addition, when the battery meets the second triggering condition (normal gradual decay of deep charge and shallow discharge) and the maintenance type supported by the new energy vehicle is the third type (not in P gear, ON gear, ready state, battery level ≥ 50%), the second maintenance strategy is adopted.

[0254] By selecting the appropriate maintenance strategy type based on the triggering conditions and the maintenance types supported by new energy vehicles, the following effects can be achieved:

[0255] Precise matching of maintenance strategy types: Based on the specific condition of the battery and the type of new energy vehicle it supports, the most suitable maintenance strategy type is selected. This ensures accurate and targeted battery maintenance, improving maintenance effectiveness and efficiency.

[0256] Adapt to actual conditions: Determine the optimal maintenance strategy based on the specific condition of the battery and the type of new energy vehicle it supports. This allows for the selection of the most suitable maintenance method based on actual circumstances, maximizing battery life and performance.

[0257] Flexibility and adaptability: The system allows for flexible adaptation to different battery conditions and vehicle characteristics, based on matching triggering conditions and maintenance types. This helps improve battery performance and lifespan while reducing unnecessary maintenance operations and resource waste.

[0258] In summary, selecting the appropriate maintenance strategy based on the triggering conditions met by the battery and the maintenance types supported by new energy vehicles can improve the accuracy and effectiveness of maintenance.

[0259] Preferably, the first maintenance strategy adopts a slow-fast-slow three-step trickle charging method, dividing the maintenance stage into a first stage, a second stage, and a third stage, wherein the charging power of the first stage and the third stage is less than the charging power of the second stage.

[0260] In one embodiment, the first maintenance strategy implementation steps are as follows:

[0261] The first step is to use a low-current constant-current slow charging method, with the battery charging current Ib set as the target current based on the battery's 20-hour rate discharge current I20 (capacity / 20).

[0262] Establish a charging current balance calculation model: Ib=(Ud*Id-Uf*If) / Ub*T

[0263] For example, the target current of a 60AH battery is Ib = 60 / 20 = 3A, Ud is the output voltage of the DC-DC converter, Id is the output current of the DC-DC converter, Uf is the load operating voltage, If is the load operating current, and T is the temperature compensation coefficient (1 for 0°C and above, increasing by 0.2 for every 5°C decrease).

[0264] The difference between the target current and the actual current is calculated by comparing the real-time current value Ibs collected by the battery sensor with the target current Ib. Ib-Ibs=△Ibb.

[0265] When ΔIbb≥0, the DC-DC converter increases the output current Id=Id+ΔIbb, making the actual charging current Ibs of the battery infinitely close to the target current Ib;

[0266] When ΔIbb < 0, the DC-DC converter reduces the output current Id = Id - ΔIbb, making the actual charging current Ibs of the battery infinitely close to the target current Ib.

[0267] The second step is: the fast charging method adopts constant voltage and unlimited current charging, and the target value of the battery charging voltage is set to Ub (e.g., 14.2V at 0°C and above, and 0.1V for every 5°C decrease).

[0268] The voltage value Ubs collected in real time by the battery sensor is compared with the target voltage Ub, and the difference between the target voltage and the actual voltage is calculated as Ub-Ubs=△Ubb;

[0269] When ΔUbb≥0, the DC-DC converter increases the output voltage Ud=Ud+ΔUbb, making the actual charging voltage Ubs of the battery infinitely close to the target voltage Ub.

[0270] When ΔUbb < 0, the DC-DC converter reduces the output voltage Ud = Ud - ΔUbb, making the actual charging voltage Ubs of the battery infinitely close to the target voltage Ub.

[0271] The third step is: slow charging method using step-down constant voltage charging, the target value of battery charging voltage is set to Ub (e.g. 13.5V at 0°C and above, increasing by 0.1V for every 5°C decrease), the output power of DCDC is not limited, and the DCDC output voltage control method is consistent with the second step;

[0272] If the maintenance process in the first stage meets the first transition condition, it will proceed to the second stage; if the maintenance process in the second stage meets the second transition condition, it will proceed to the third stage; and if the maintenance process in the third stage meets the third transition condition, the maintenance will end.

[0273] The first maintenance strategy employs a slow-fast-slow three-step trickle charging method, using different charging methods and target parameters to maintain the battery. In each stage, based on the battery's condition and target current / voltage settings, the output current and voltage of the DC-DC converter are adjusted to bring the actual charging current and voltage of the battery close to the target values, thereby completing the maintenance process.

[0274] For example, suppose the battery capacity is 60AH, the target current is set to 3A, and the target voltage is set to 14.2V. In the first step of low-current constant-current slow charging, the output current of the DC-DC converter is adjusted by comparing the real-time current value collected by the battery with the target current to make the actual charging current close to the target current. If the actual current is greater than the target current, the output current of the DC-DC converter is increased; if the actual current is less than the target current, the output current of the DC-DC converter is decreased.

[0275] This slow-fast-slow charging method allows for control of battery charging power at different stages. The first stage uses low-current constant-current slow charging, the second stage uses fast-charging constant-voltage charging, and the third stage uses slow-charging step-down constant-voltage charging. This maintenance strategy better meets the battery's charging needs and improves maintenance effectiveness. By performing deep charge-discharge and constant-current / constant-voltage charging, the battery's state of charge can be optimized, improving its lifespan and performance.

[0276] In general, the primary maintenance strategy can employ different charging methods and parameter controls based on the specific condition of the battery and the target current / voltage settings to achieve precise battery maintenance. This will effectively extend the battery's lifespan and improve its performance and reliability.

[0277] Preferably, in the first maintenance strategy, the first transition condition, the second transition condition, and the third transition condition correspond to the battery's power increment threshold / charging time threshold, power threshold, and power threshold / charging time threshold during the first, second, and third stages of the maintenance process, respectively.

[0278] In one embodiment, the first transition condition, such as the end point of slow charging, is determined by the incremental threshold ΔSOC of the battery charge (real-time charge) or the continuous charging time threshold t, such as ΔSOC≥10% or t≥3600S.

[0279] The second transition condition is determined, for example, by the battery charge (real-time charge) SOC reaching the charge increment threshold (e.g., SOC≥80);

[0280] The third transition condition, such as the end point of slow charging, is determined by the SOC reaching the power threshold or the continuous charging time threshold t. For example, if SOC ≥ 95% or t ≥ 3600S, the maintenance is confirmed to be completed and the maintenance mode is exited.

[0281] By setting appropriate transition conditions, the switching between different stages during maintenance can be effectively controlled. When the battery's charge increment or charging time reaches a set threshold, the completion status of the maintenance stage can be accurately determined, and the process can smoothly proceed to the next stage. This ensures that the battery receives appropriate charging at different stages to achieve optimal maintenance results.

[0282] Overall, these transition conditions provide a flexible way to determine the completion status of different stages during maintenance. By setting appropriate power increment thresholds / charging time thresholds and power thresholds, judgments can be made based on the actual condition of the battery, ensuring that the battery is fully charged during maintenance to achieve good maintenance results.

[0283] Preferably, the second maintenance strategy adopts a full discharge and full charge maintenance method. After the battery temperature and charge reach a preset level through a discharge load, the maintenance stage is divided into a first stage, a second stage and a third stage. The charging power of the first stage and the third stage is less than the charging power of the second stage.

[0284] If the maintenance process in the first stage meets the fourth transition condition, it will proceed to the second stage; if the maintenance process in the second stage meets the fifth transition condition, it will proceed to the third stage; if the maintenance process in the third stage meets the sixth transition condition, the maintenance will end.

[0285] In one embodiment, the implementation steps of the second maintenance strategy are as follows:

[0286] The first step is to use constant current discharge. The target constant current discharge current Ib of the battery is set according to the 20-hour rate discharge current I20 (capacity / 20). For example, the target discharge current Ib of a 60AH battery is 60 / 20 = 3A.

[0287] According to the charge / discharge current balance calculation model, Ib = (Ud*Id - Uf*If) / Ub*T

[0288] When the first or second type of trigger condition is initiated, the DC-DC output current Id is 0, and the air conditioner blower is turned on as the load discharge current If.

[0289] The difference between the target current and the actual current is calculated by comparing the real-time current value Ibs collected by the battery sensor with the target current Ib. Ib-Ibs=△Ibb.

[0290] When ΔIbb≥0, control the working current of the blower If=If-ΔIbb, so that the actual discharge current Ibs of the battery is infinitely close to the target current Ib;

[0291] When ΔIbb < 0, control the working current of the blower If = If + ΔIbb, so that the actual discharge current Ibs of the battery is infinitely close to the target current Ib.

[0292] When the third type of activation enters the second trigger condition, the dynamic variable of the vehicle electrical load current If is adjusted by regulating the DC-DC output current Id to make the battery discharge current Ib reach a balance and stability.

[0293] The difference between the target current and the actual current is calculated by comparing the real-time current value Ibs collected by the battery sensor with the target current Ib. Ib-Ibs=△Ibb.

[0294] When ΔIbb≥0, control the DC-DC output current to decrease Id=Id-ΔIbb, so that the actual discharge current Ibs of the battery is infinitely close to the target current Ib.

[0295] When ΔIbb < 0, control the DCDC output current to increase Id = Id + ΔIbb, so that the actual discharge current Ibs of the battery is infinitely close to the target current Ib;

[0296] The second step is constant current charging. The charging model is based on Ib = (Ud*Id - Uf*If) / Ub*T, and the process is divided into three steps.

[0297] The first stage uses a constant current charging method of 0.05 * C20 for 8 hours; for example, the target current Ib for a 60AH battery is 0.05 * 60 = 3A.

[0298] The second stage uses a constant current charging method of 0.1*C20 for 8 hours; for example, the target current Ib for a 60AH battery is 0.1*60 = 6A.

[0299] The third stage uses a constant current charging method of 0.05*C20 for 2 hours; for example, the target current Ib for a 60AH battery is 0.05*60 = 3A.

[0300] The target current for constant current charging is set as above. Based on the current value collected in real time by the battery sensor, the output current of the DC-DC converter is controlled to make the battery charging current reach a balanced and stable state.

[0301] The end point of the second step, constant current charging, is determined according to the three segmented charging time thresholds. Once these thresholds are reached, the maintenance is confirmed to be complete, and the maintenance mode is exited.

[0302] The second maintenance strategy employs a full discharge and full charge method. After the battery's temperature and charge reach a preset level through a discharge load, the maintenance process is divided into three stages: Stage 1, Stage 2, and Stage 3. The charging power in Stage 1 and Stage 3 is lower than that in Stage 2. During implementation, the discharge load or DC-DC output current is controlled based on the difference between the battery's real-time current and the target current, ensuring that the actual battery discharge current closely approximates the target current.

[0303] For example, the first step is the constant current discharge stage, where the target constant current discharge current Ib is set based on the battery's 20-hour rate discharge current I20 (capacity / 20). By comparing the difference between the actual current and the target current ΔIbb, the blower operating current If or the DC-DC output current Id is controlled to make the battery's actual discharge current infinitely close to the target current Ib. The second step is the constant current charging stage, where segmented charging is performed according to the set charging time and current value. Based on the difference between the battery's real-time current and the target current ΔIbb, the DC-DC output current Id is controlled to make the battery charging current reach a balanced and stable state.

[0304] The second maintenance strategy achieves battery maintenance through two stages: constant current discharge and constant current charging. In the constant current discharge stage, the actual discharge current of the battery is brought as close as possible to the target current by controlling the discharge load or the DC-DC output current, thus achieving a maintenance effect. In the constant current charging stage, segmented charging is performed according to the set charging time and current value, and the battery charging current is balanced and stable by controlling the DC-DC output current.

[0305] In general, the second maintenance strategy maintains the battery through a full discharge and full charge process, achieving the desired maintenance effect by precisely controlling the current during discharge and charging. This ensures that the battery receives appropriate discharge and charge during maintenance to maintain its performance and lifespan. Furthermore, by dividing the maintenance process into different stages and setting different charging times and current values, precise adjustments can be made according to the battery's actual condition and needs to achieve optimal maintenance results.

[0306] The advantage of this full-discharge-full-charge maintenance method lies in its more comprehensive battery maintenance, taking into account both the battery's temperature and charge level. The control strategies for the discharge load and constant-current charging stages can be dynamically adjusted based on the battery's real-time status to meet maintenance needs. By dividing the maintenance process into different stages and setting different charging power according to the stage requirements, the battery charging process can be controlled more effectively, ensuring its safety and stability.

[0307] For example, if the battery triggers maintenance conditions and meets the requirements of the second maintenance strategy, according to the steps in the embodiment, a constant current discharge stage is first performed. If the actual discharge current of the battery deviates from the target current, the blower operating current is controlled or the DC-DC output current is adjusted to bring it closer to the target current. Next is the constant current charging stage, where charging is performed in segments according to the set charging time and current value. By controlling the DC-DC output current, the battery charging current is made to reach a balanced and stable state, and the charging process is judged to be complete according to the charging time threshold set for each stage.

[0308] This type of maintenance strategy ensures that the battery receives proper handling during charging and discharging, eliminating the risk of overcharging or over-discharging and extending battery life. Furthermore, dynamically adjusting the current during charging and discharging based on actual conditions better adapts to the characteristics and needs of different batteries, improving maintenance effectiveness and efficiency.

[0309] In summary, the second maintenance strategy employs a full discharge and full charge method. By precisely controlling the current and charging time during the discharge and charging processes, comprehensive and effective battery maintenance can be achieved. This strategy considers important parameters such as battery temperature and charge level, and dynamically adjusts them according to actual conditions to achieve optimal maintenance results, extend battery life, and improve the performance and reliability of new energy vehicles.

[0310] Preferably, the preset level includes at least two temperature ranges and their corresponding battery remaining power thresholds.

[0311] In one embodiment, the preset levels include:

[0312] The first tier, with temperatures above 0°C set at 10%;

[0313] The second tier, with temperatures at or below 0°C, is set at 15%.

[0314] The third tier, with temperatures of -18℃ and below, is set at 20%.

[0315] The fourth level, -30℃ and below, is set at 25%.

[0316] This invention, by classifying batteries into different grades, can determine the maintenance needs of batteries based on changes in temperature and charge, and take corresponding maintenance measures.

[0317] For example, in one embodiment, the preset levels are divided into four levels, each with different thresholds set for different temperature ranges and remaining battery power. The first level is for temperature ranges above 0°C, with a remaining battery power threshold set at 10%. The second level is for temperature ranges of 0°C and below, with a remaining battery power threshold set at 15%. The third level is for temperature ranges of -18°C and below, with a remaining battery power threshold set at 20%. The fourth level is for temperature ranges of -30°C and below, with a remaining battery power threshold set at 25%.

[0318] Such preset levels can set maintenance trigger conditions and corresponding maintenance strategies based on the battery's remaining charge under different temperature conditions. For example, the battery's remaining charge threshold is set higher at lower temperatures because low temperatures affect battery performance, and a higher remaining charge is needed to ensure the battery operates normally in low-temperature environments.

[0319] By setting preset levels, the maintenance needs of the battery can be determined based on changes in temperature and remaining charge, and corresponding maintenance measures can be taken. This ensures stable operation of the battery under different temperature conditions, extends its service life, and improves the performance and reliability of new energy vehicles.

[0320] In summary, the preset maintenance levels are based on temperature ranges and the remaining battery charge threshold to determine the battery's maintenance needs. By appropriately setting different thresholds, a secondary maintenance strategy can be determined based on changes in temperature and remaining charge, ensuring the battery's normal operation in different environments and extending its lifespan.

[0321] Preferably, in the second maintenance strategy, the fourth transition condition, the fifth transition condition, and the sixth transition condition correspond to the battery charging time thresholds during the first, second, and third stages of maintenance, respectively.

[0322] As in the second step of the above embodiment,

[0323] The first segment uses a charging time threshold of 8 hours;

[0324] The second stage uses a charging time threshold of 8 hours;

[0325] The third segment uses a charging time threshold of 2 hours.

[0326] The transition conditions in the second maintenance strategy are determined by charging time thresholds to switch between different stages of the battery maintenance process. The transition conditions for each stage are determined based on the set charging time thresholds, which then decide whether to proceed to the next stage.

[0327] For example, in one embodiment, the second step of the second maintenance strategy is divided into three stages, each using a different charging time threshold. The charging time threshold for the first stage is set to 8 hours, the charging time threshold for the second stage is also 8 hours, and the charging time threshold for the third stage is 2 hours.

[0328] This setting means that during the implementation of the second maintenance strategy, when the battery is charging, the actual charging time is compared with the set threshold to determine whether the transition conditions are met, and thus decide whether to proceed to the next stage of the maintenance process.

[0329] For example, during the first stage of maintenance, if the battery charging time exceeds the set threshold of 8 hours, the fourth transition condition is met, and the second stage of maintenance can proceed. Similarly, during the second and third stages of maintenance, whether the charging time reaches the corresponding threshold is used to determine whether the transition condition is met, thus deciding whether to proceed to the next stage of maintenance.

[0330] By setting different charging time thresholds, the maintenance process can be controlled based on the charging time during battery maintenance. This ensures that the battery is fully charged at different stages of maintenance and switches according to the set time thresholds to achieve a full discharge and full charge maintenance effect.

[0331] In summary, the transition conditions in the second maintenance strategy are based on charging time thresholds to determine the process switching during battery maintenance. By setting charging time thresholds for different stages, the actual charging time can be compared with the set thresholds to determine whether the transition conditions are met and whether to proceed to the next stage of the maintenance process. This ensures that the battery receives adequate charging during maintenance and switches maintenance processes according to the set time thresholds, achieving a full discharge and full charge maintenance effect.

[0332] A new energy vehicle includes a maintenance system for the low-voltage battery of the new energy vehicle.

[0333] The design of this new energy vehicle includes a maintenance system for its low-voltage battery, designed to ensure battery performance and lifespan. This system will be analyzed below.

[0334] In principle, the maintenance system for low-voltage batteries in new energy vehicles achieves regular battery maintenance through the coordinated work of an information acquisition module, an information processing module, a power battery, a discharge load, and other components. The information acquisition module collects data on battery parameters and the status of the new energy vehicle. The information processing module determines the battery's maintenance needs based on preset trigger conditions and battery parameters, and then determines the applicable maintenance type and strategy. The power battery performs the charging maintenance process, while the discharge load assists in the battery's discharge process. These components work together to achieve precise battery maintenance.

[0335] For example, a new energy vehicle is equipped with this maintenance system. When the battery parameters and vehicle status meet the set trigger conditions, the information processing module determines that the battery needs maintenance. According to a preset second maintenance strategy, the system charges the battery according to a specific charging method and stages, while a discharge load assists in completing the discharge process. Through precise control, the maintenance system can ensure that the battery receives proper charging and discharging, thereby extending its service life.

[0336] In terms of effectiveness, the maintenance system for low-voltage batteries in new energy vehicles can significantly improve battery performance and reliability. Regular maintenance can control battery capacity degradation, extending its lifespan. The system's intelligent design and precise control methods make charging and discharging processes more accurate and efficient, thereby improving battery energy storage efficiency and the overall performance of the new energy vehicle system.

[0337] Overall, this maintenance system for low-voltage batteries in new energy vehicles is designed to ensure the normal operation of the batteries and extend their lifespan. Through information acquisition, processing, and control, the system can determine maintenance needs based on battery parameters and vehicle status, and implement corresponding secondary maintenance strategies. The application of this system can improve the reliability and lifespan of new energy vehicles, enhance energy storage efficiency, and ensure the stable operation of the entire new energy vehicle system.

[0338] Besides its battery maintenance function, this low-voltage battery maintenance system for new energy vehicles offers other advantages. First, the system's information acquisition module can monitor battery parameters and vehicle status in real time, providing timely data feedback and fault diagnosis for owners and maintenance personnel, thus improving vehicle manageability and maintainability. Second, the intelligent design of the maintenance system makes the maintenance process more automated and precise, reducing the burden of manual operation and improving maintenance efficiency and accuracy. Furthermore, the maintenance system connects and works collaboratively with other key components such as chargers, DC-DC converters, and VCU controllers, achieving integrated control and optimization of the entire energy management system.

[0339] For example, a new energy electric vehicle is equipped with this maintenance system. During vehicle operation, the information acquisition module continuously monitors parameters such as battery charge, temperature, and voltage, and collects vehicle status information such as vehicle gear position, battery gear position, and charger status. The information processing module determines maintenance needs based on preset trigger conditions and battery parameters, and selects the appropriate maintenance type and strategy. The battery and discharge load then perform charging and discharging processes according to the second maintenance strategy to ensure battery performance and lifespan.

[0340] Overall, this maintenance system for low-voltage batteries in new energy vehicles achieves precise maintenance and optimized management of the batteries through information acquisition, processing, and control. It provides accurate determination of maintenance needs, intelligent selection of secondary maintenance strategies, efficient charging and discharging processes, and coordinated operation with other components. This maintenance system can significantly improve battery performance and reliability, extend its service life, and provide crucial support for the reliable operation and efficient energy management of new energy vehicles.

[0341] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0342] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0343] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1The function specified in one or more boxes.

[0344] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0345] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0346] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, like read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0347] Computer-readable media include both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0348] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0349] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for maintaining a low-voltage battery in a new energy vehicle, characterized in that, include: The maintenance needs of the battery are determined based on preset trigger conditions and battery parameters; the battery parameters include the battery charge value and the rate of change of charge within a specified time range. Determine if the status of the new energy vehicle meets the maintenance type supported by the new energy vehicle for battery maintenance. The maintenance strategy for the battery is determined based on the preset trigger condition type and the maintenance type supported by the new energy vehicle. The preset trigger condition type includes a first trigger condition and a second trigger condition. The first trigger condition is that the battery value is less than a first battery threshold and the battery change rate within a first time range is greater than a first change rate threshold. The second trigger condition is that the battery change rate within a second time range is less than a second change rate threshold. The maintenance strategy includes a first maintenance strategy used when the battery meets the first triggering condition and a second maintenance strategy used when the battery meets the second triggering condition. The first maintenance strategy is a slow-fast-slow three-step trickle charging method, and the second maintenance strategy is a full discharge and full charge maintenance method.

2. The maintenance method for low-voltage batteries in new energy vehicles according to claim 1, characterized in that, The status of the new energy vehicle includes: the gear position of the new energy vehicle, the gear position of the power battery, the working status of the charger, and the power battery charge.

3. The maintenance method for low-voltage batteries in new energy vehicles according to claim 2, characterized in that, The maintenance types supported by the new energy vehicles include: The first type is when the new energy vehicle is in P gear, the power battery is in OFF gear, the charger is not connected, and the power battery charge meets the first preset threshold. The second type is when the new energy vehicle is in P gear, the power battery gear is in OFF gear, the charger is in connected charging state, and the power battery charge meets the second preset threshold. The third type is when the new energy vehicle is not in P gear, the power battery is in ON gear, the charger is in ready state, and the power battery charge meets the third preset threshold.

4. The maintenance method for low-voltage batteries in new energy vehicles according to claim 3, characterized in that, The first preset threshold is less than the second preset threshold, and the second preset threshold is less than the third preset threshold.

5. The maintenance method for low-voltage batteries in new energy vehicles according to claim 1, characterized in that, The first maintenance strategy divides the maintenance phase into a first phase, a second phase, and a third phase, with the charging power of the first and third phases being less than that of the second phase. If the maintenance process in the first stage meets the first transition condition, it will proceed to the second stage; if the maintenance process in the second stage meets the second transition condition, it will proceed to the third stage; and if the maintenance process in the third stage meets the third transition condition, the maintenance will end.

6. The maintenance method for low-voltage batteries in new energy vehicles according to claim 5, characterized in that, In the first maintenance strategy, the first transition condition, the second transition condition, and the third transition condition correspond to the battery's power increment threshold / charging time threshold, power threshold, and power threshold / charging time threshold during the first, second, and third stage maintenance processes, respectively.

7. The maintenance method for low-voltage batteries in new energy vehicles according to claim 1, characterized in that, The second maintenance strategy divides the maintenance phase into a first phase, a second phase, and a third phase after the battery temperature and charge reach a preset level through a discharge load. The charging power of the first phase and the third phase is less than that of the second phase. If the maintenance process in the first stage meets the fourth transition condition, it will proceed to the second stage; if the maintenance process in the second stage meets the fifth transition condition, it will proceed to the third stage; if the maintenance process in the third stage meets the sixth transition condition, the maintenance will end.

8. The maintenance method for low-voltage batteries in new energy vehicles according to claim 7, characterized in that, The preset levels include at least two temperature ranges and their corresponding battery remaining power thresholds.

9. The maintenance method for low-voltage batteries in new energy vehicles according to claim 7, characterized in that, In the second maintenance strategy, the fourth, fifth, and sixth transition conditions correspond to the battery charging time thresholds during the first, second, and third stages of maintenance, respectively.

10. A maintenance system for low-voltage batteries in new energy vehicles, characterized in that, include: An information acquisition module is used to acquire battery parameters and the status of the new energy vehicle; the battery parameters include the battery charge value and the charge change rate within a specified time range. The information processing module determines the battery maintenance needs based on preset trigger conditions and battery parameters; and determines the new energy vehicle status that meets the new energy vehicle support maintenance type for battery maintenance. The battery maintenance strategy is determined based on preset trigger condition types and the maintenance types supported by new energy vehicles. The preset trigger condition types include a first trigger condition and a second trigger condition. The first trigger condition is that the battery charge value is less than a first charge threshold and the rate of change of charge within a first time range is greater than a first rate of change threshold. The second trigger condition is that the rate of change of charge within a second time range is less than a second rate of change threshold. The maintenance strategy types include a first maintenance strategy adopted when the battery meets the first trigger condition and a second maintenance strategy adopted when the battery meets the second trigger condition. The first maintenance strategy is a slow-fast-slow three-step trickle charging method, and the second maintenance strategy is a full discharge and full charge maintenance method. The power battery performs maintenance on the storage battery according to the maintenance strategy; A discharge load, which is used to assist the battery in discharging.

11. The maintenance system for low-voltage batteries of new energy vehicles according to claim 10, characterized in that, The status of the new energy vehicle includes: the gear position of the new energy vehicle, the gear position of the power battery, the working status of the charger, and the power battery charge.

12. The maintenance system for low-voltage batteries of new energy vehicles according to claim 11, characterized in that, The maintenance types supported by the new energy vehicles include: The first type is when the new energy vehicle is in P gear, the power battery is in OFF gear, the charger is not connected, and the power battery charge meets the first preset threshold. The second type is when the new energy vehicle is in P gear, the power battery gear is in OFF gear, the charger is in connected charging state, and the power battery charge meets the second preset threshold. The third type is when the new energy vehicle is not in P gear, the power battery is in ON gear, the charger is in ready state, and the power battery charge meets the third preset threshold.

13. The maintenance system for low-voltage batteries of new energy vehicles according to claim 12, characterized in that, The first preset threshold is less than the second preset threshold, and the second preset threshold is less than the third preset threshold.

14. The maintenance system for low-voltage batteries of new energy vehicles according to claim 10, characterized in that, The first maintenance strategy divides the maintenance phase into a first phase, a second phase, and a third phase, and the charging power of the first phase and the third phase is less than that of the second phase. If the maintenance process in the first stage meets the first transition condition, it will proceed to the second stage; if the maintenance process in the second stage meets the second transition condition, it will proceed to the third stage; and if the maintenance process in the third stage meets the third transition condition, the maintenance will end.

15. The maintenance system for low-voltage batteries of new energy vehicles according to claim 14, characterized in that, In the first maintenance strategy, the first transition condition, the second transition condition, and the third transition condition correspond to the battery's power increment threshold / charging time threshold, power threshold, and power threshold / charging time threshold during the first, second, and third stage maintenance processes, respectively.

16. The maintenance system for low-voltage batteries of new energy vehicles according to claim 10, characterized in that, The second maintenance strategy divides the maintenance phase into a first phase, a second phase, and a third phase after the battery temperature and charge reach a preset level through a discharge load. The charging power of the first phase and the third phase is less than that of the second phase. If the maintenance process in the first stage meets the fourth transition condition, it will proceed to the second stage; if the maintenance process in the second stage meets the fifth transition condition, it will proceed to the third stage; if the maintenance process in the third stage meets the sixth transition condition, the maintenance will end.

17. The maintenance system for low-voltage batteries of new energy vehicles according to claim 16, characterized in that, The preset levels include at least two temperature ranges and their corresponding battery remaining power thresholds.

18. The maintenance system for low-voltage batteries of new energy vehicles according to claim 16, characterized in that, In the second maintenance strategy, the fourth, fifth, and sixth transition conditions correspond to the battery charging time thresholds during the first, second, and third stages of maintenance, respectively.

19. A new energy vehicle, characterized in that, The new energy vehicle includes a maintenance system for the low-voltage battery of the new energy vehicle as described in any one of claims 10-18.

Images