A method, system and device for maintaining charging of an alternating current charging pile

Abstract

The application discloses a kind of maintenance charging methods of alternating current charging pile, comprising the following steps: receiving battery information and charging mode information, the battery information includes battery capacity, and the charging mode information includes conventional charging mode information and maintenance charging mode information: when receiving conventional charging mode information, select conventional charging mode to execute charging, when receiving maintenance charging mode information, select maintenance charging mode to execute charging;After selecting maintenance charging mode to execute charging, corresponding maintenance charging strategy is selected according to battery capacity, and the maintenance charging strategy includes at least three, and different battery capacities are corresponded respectively.Compared with prior art, the maintenance function of alternating current charging pile can be realized by the application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging, in particular to a maintenance charging method, system and device of an alternating current charging pile. BACKGROUND

[0002] As the core energy supplement equipment in the family scene, the alternating current charging pile has gradually replaced the traditional emergency energy supplement mode and become the main choice for family charging, with the advantages of convenient installation, low use cost and wide adaptability. However, as the service life of new energy vehicles is extended, the internal single cell of the power battery as the core energy storage component of the vehicle is gradually affected by factors such as the number of charge and discharge cycles, temperature fluctuations in the working environment, and differences in aging rates, and gradually appears the problem of voltage imbalance. This imbalance will directly lead to a significant decrease in the overall charge and discharge efficiency of the battery pack, and then cause a significant reduction in the vehicle's range, which not only seriously affects the user's daily driving experience, but also shortens the overall service life of the power battery and increases the user's later vehicle cost.

[0003] At present, the solution to the problem of battery voltage imbalance in the industry still mainly relies on the battery management system (BMS) independently developed by automobile manufacturers. However, the existing battery management system generally lacks effective active balancing control means, and is limited by the priority consideration of the market's demand for rapid energy supplement. Most manufacturers focus more on improving the charging speed to meet the user's immediate energy supplement demand when formulating the battery management strategy, and pay insufficient attention to the long-term maintenance of the voltage balance of the single cell, which makes it difficult to fundamentally improve the balance problem.

[0004] Therefore, a maintenance charging method, system and device of an alternating current charging pile are provided. SUMMARY

[0005] The purpose of the present application is to provide a maintenance charging method, system and device of an alternating current charging pile to realize the maintenance function of the alternating current charging pile.

[0006] The above technical purpose of the present application is realized by the following technical scheme:

[0007] A maintenance charging method of an alternating current charging pile, comprising the steps of:

[0008] receiving battery information and charging mode information, the battery information including battery capacity, and the charging mode information including regular charging mode information and maintenance charging mode information:

[0009] when receiving the regular charging mode information, selecting the regular charging mode to perform charging, and when receiving the maintenance charging mode information, selecting the maintenance charging mode to perform charging;

[0010] After selecting the maintenance charging mode to perform charging, a corresponding maintenance charging strategy is selected according to the battery capacity, and the maintenance charging strategy includes at least three, corresponding to different battery capacities respectively.

[0011] In a preferred embodiment, the maintenance charging strategy includes a low-capacity charging strategy, a medium-capacity charging strategy, and a high-capacity charging strategy, the power curve function under the low-capacity charging strategy is set as f1(x), the power curve function under the medium-capacity charging strategy is set as f2(x), and the power curve function under the high-capacity charging strategy is set as f3(x), the battery capacity is a parameter a, the first capacity node is j, the second capacity node is h, and the third capacity node is k, and the following functions are provided:

[0012]

[0013] Wherein a is a positive number, u is the input voltage, and t is the charging time.

[0014] In a preferred embodiment, the first capacity node j is 40, the second capacity node h is 60, and the third capacity node k is 100.

[0015] In a preferred embodiment, the charging time t is less than or equal to 24.

[0016] In a preferred embodiment, the battery capacity is the total capacity of the battery.

[0017] In a preferred embodiment, the maintenance charging mode is selected to perform charging only when the battery capacity is between 15% and 25%.

[0018] In a preferred embodiment, the battery capacity is calculated as follows:

[0019] Obtain the total capacity and the occupied capacity of the battery;

[0020] Calculate the remaining capacity: total capacity - occupied capacity;

[0021] Calculate the battery capacity = remaining capacity / (100% - maintenance preset remaining capacity).

[0022] In a preferred embodiment, the maintenance preset remaining capacity is set to 15%-25%.

[0023] A maintenance charging system for an alternating current charging pile, comprising:

[0024] An information receiving unit for receiving battery information and charging mode information, the battery information including battery capacity, and the charging mode information including regular charging mode information and maintenance charging mode information:

[0025] A mode selection unit is configured to select a regular charging mode to perform charging when receiving regular charging mode information, and select a maintenance charging mode to perform charging when receiving maintenance charging mode information.

[0026] A maintenance charging unit is configured to select a corresponding maintenance charging strategy according to the battery capacity after selecting the maintenance charging mode to perform charging, and the maintenance charging strategy includes at least three corresponding to different battery capacities.

[0027] The maintenance charging strategy includes a low-capacity charging strategy, a medium-capacity charging strategy, and a high-capacity charging strategy, the power curve function under the low-capacity charging strategy is set as f1(x), the power curve function under the medium-capacity charging strategy is set as f2(x), the power curve function under the high-capacity charging strategy is set as f3(x), the battery capacity is a parameter a, the first capacity node is j, the second capacity node is h, and the third capacity node is k, and the following functions are provided:

[0028]

[0029] Wherein, a is a positive number, u is an input voltage, and t is a charging time.

[0030] A maintenance charging device of an alternating current charging pile, which applies the maintenance charging method of the alternating current charging pile or the maintenance charging system of the alternating current charging pile.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] Under the technical framework of the maintenance charging method of the alternating current charging pile defined by the present application, the core function upgrade of the alternating current charging pile from traditional "passive response" to "active control" is first realized, and the complete dependence of the existing charging technology on the vehicle battery management system (BMS) is completely eliminated, effectively solving the key defect in the prior art that the vehicle BMS prioritizes fast energy replenishment and ignores battery cell voltage balancing. Specifically, the method receives user input battery information (corely including battery capacity) and charging mode information (distinguishing between regular charging and maintenance charging), and can start the exclusive control logic in the maintenance charging mode, rather than passively executing the instructions of the vehicle BMS as a regular charging pile, which enables the charging pile to independently develop battery maintenance strategies, even if the balancing logic of the vehicle BMS itself is imperfect or has a low priority, the charging pile can still actively intervene to achieve efficient battery balancing management.

[0033] Further, the design of "selecting the corresponding maintenance charging strategy according to the battery capacity, and the maintenance charging strategy is at least three" in the scheme can accurately adapt to the new energy vehicle batteries of different capacity specifications on the market (can cover more than 95% of common vehicle models), avoiding the problem of poor balancing effect caused by the existing general charging strategy that cannot match the characteristics of different capacity batteries. For example, for small capacity batteries, the corresponding maintenance charging strategy can be adjusted to a relatively low power mode to avoid the impact of fast charging on balancing; for large capacity batteries, the optimized power curve can ensure that the charging process from 20% to 100% SOC is completed within 24 hours, while providing sufficient time for battery cell balancing. This differentiated strategy design based on battery capacity ensures that each type of battery can obtain an adaptive charging current (precise regulation within the range of 8-32A) and power output, ensuring that the battery management system has sufficient time to execute the cell voltage balancing algorithm during the charging process, gradually reducing the voltage difference between single cells, and avoiding the accumulation of voltage difference leading to battery capacity degradation.

[0034] Finally, by actively developing maintenance strategies and differentiating capacity adaptation, the method directly promotes the single cell voltage of the battery cell to be consistent, effectively improving the capacity fullness of the battery. Compared with the traditional charging method relying on the vehicle BMS, after using the method, the battery can store more electric energy under the same SOC state, which reflects the significant improvement of the vehicle's endurance level. At the same time, long-term maintenance charging can also slow down the battery capacity degradation rate, indirectly extending the overall service life of the battery, bringing "endurance improvement + battery durability" double benefits to users, and also endowing the alternating current charging pile with battery maintenance value-added functions in addition to basic charging. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a flowchart of the maintenance charging method of the alternating current charging pile according to the present application.

[0036] Figures 2 is a power curve diagram of the low-capacity charging strategy of the maintenance charging method of the alternating current charging pile according to the present application.

[0037] Figures 3 is a power curve diagram of the medium-capacity charging strategy of the maintenance charging method of the alternating current charging pile according to the present application.

[0038] Figures 4 is a power curve diagram of the high-capacity charging strategy of the maintenance charging method of the alternating current charging pile according to the present application. DETAILED DESCRIPTION

[0039] The present application will be further described in detail below in conjunction with the drawings.

[0040] The specific embodiments are merely illustrative of the present application, and are not intended to limit the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, and as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law. Embodiment one:

[0041] As shown in the figure, a maintenance charging method of an alternating current charging pile, comprising the steps of: Figure 1

[0042] receiving battery information and charging mode information, the battery information including battery capacity, and the charging mode information including regular charging mode information and maintenance charging mode information:

[0043] when receiving the regular charging mode information, selecting the regular charging mode to perform charging, and when receiving the maintenance charging mode information, selecting the maintenance charging mode to perform charging;

[0044] after selecting the maintenance charging mode to perform charging, selecting a corresponding maintenance charging strategy according to the battery capacity, the maintenance charging strategy including at least three corresponding to different battery capacities.

[0045] In the technical architecture of the alternating current charging pile maintenance charging method, the primary realization is the fundamental transformation of the alternating current charging pile function — from the single role of "passively receiving vehicle instructions and only bearing electric energy transmission" in the traditional charging scene to the core control role of "actively leading the charging process and independently formulating maintenance plans". This transformation completely breaks through the technical limitations of existing charging technology which completely relies on the vehicle battery management system (BMS), effectively solving the key problem of weakening battery cell voltage balancing in existing solutions due to the vehicle BMS focusing on "quick energy replenishment". Even if the BMS balancing logic of some vehicles has design defects or low priority settings, through this method, the alternating current charging pile can still provide efficient balancing management for the battery with its own strategy formulation ability, without being subject to the control logic of the vehicle end.

[0046] ​At the same time, the design of selecting the corresponding maintenance charging strategy according to the battery capacity, and the number of maintenance charging strategies is at least three, has strong adaptability - can accurately cover most of the battery capacity specifications of new energy vehicles on the market (coverage ratio can reach more than 95% of common vehicle models), avoiding the problem that the existing general charging strategy cannot match the charging and discharging characteristics of batteries of different capacities, resulting in over-fast charging of small-capacity batteries, insufficient equalization time, or long charging time and low efficiency of large-capacity batteries. For example, for small-capacity batteries, the corresponding maintenance charging strategy will use relatively moderate power output and adaptive current (8-32A range for accurate control) to ensure sufficient equalization process; for large-capacity batteries, through the optimized power curve design, the charging period of 20%-100% SOC is efficiently completed within 24 hours, and sufficient time is reserved for battery cell equalization. This differentiated strategy based on battery capacity allows each type of battery to operate under adaptive charging conditions, ensuring that the battery management system has sufficient time to execute the cell voltage equalization algorithm, gradually reducing the voltage difference between single cells, and preventing battery capacity degradation caused by long-term accumulation of voltage difference.

[0047] The above method promotes the single-cell voltage of the battery to be stable and consistent through active control and differentiated adaptation, significantly improving the capacity of the battery - compared to the traditional charging method relying on the vehicle BMS, the battery can store more electric energy under the same SOC state after using this method, directly reflecting the improvement of vehicle range; Long-term use can also slow down the battery capacity decay rate and prolong the overall service life of the battery. This not only brings users practical benefits such as "enhanced range and durable battery", but also enables AC charging piles to break through the functional boundaries of basic charging and add value-added properties of battery maintenance. Further, the maintenance charging strategy includes a low-capacity charging strategy, a medium-capacity charging strategy, and a high-capacity charging strategy, the power curve function under the low-capacity charging strategy is set as f1(x), the power curve function under the medium-capacity charging strategy is set as f2(x), and the power curve function under the high-capacity charging strategy is set as f3(x), the battery capacity is a parameter a, the first capacity node is j, the second capacity node is h, and the third capacity node is k, and the following functions are provided:

[0048]

[0049] Wherein a is a positive number, u is an input voltage, and t is a charging time. In this embodiment, u is 220V.

[0050] The battery charging strategy is divided into low, medium and high categories according to capacity, and the differentiated power curve is designed to fully match the charging and discharging characteristics and maintenance needs of batteries of different capacities, solving the problem of poor adaptability and unstable balancing effect caused by the traditional general strategy "one size fits all". The low-capacity charging strategy adopts a horizontal power curve corresponding to the minimum current. The core advantage is to adapt to the characteristics of low-capacity batteries, which generally have weak charging acceptance and limited heat dissipation performance. The minimum current output can always maintain a stable charging state, avoiding the expansion of local heating and cell voltage difference caused by current fluctuations, and at the same time, the continuous low-power environment allows the battery management system (BMS) to adjust the balancing logic without frequent adjustments, ensuring that the balancing process is continuous and complete, and the balancing effect is maximized without being interrupted by sudden changes in power.

[0051] The medium-capacity charging strategy "first maximum power charging, then gradually reducing power, and finally ending with the lowest power" precisely balances maintenance efficiency and balancing depth. The initial charging period uses maximum power to quickly raise the battery SOC from 20% to the medium-high range, effectively shortening the overall maintenance period and avoiding reducing user willingness due to long charging time. As the SOC rises, the battery's charging acceptance gradually decreases, so gradually reducing the power can reduce battery heating and prevent cell damage caused by overcurrent, while providing more time to address voltage differences between cells. Finally, switching to the lowest power, the remaining voltage difference is fine-tuned through slow charging at extremely low power, further reducing cell voltage differences.

[0052] The high-capacity charging strategy "similar to the medium-capacity strategy but with slower power reduction" fully considers the characteristics of high-capacity batteries, which have large energy reserves and require more power to supplement. The slower power reduction rate can maintain a relatively high charging power for a longer period of time, ensuring that the high-capacity battery is fully charged during the maintenance period and avoiding the risk of charging timeout due to rapid power reduction. At the same time, the slow and steady power curve provides a stable and consistent balancing environment, allowing the cell voltage balancing to progress simultaneously while supplementing a large amount of power, avoiding the situation where the power is fully supplemented but the balancing is insufficient, achieving the dual goals of "efficient power supplementation" and "deep balancing". Overall, the three types of curves are designed to match the characteristics of different capacity batteries, allowing each type of battery to complete maintenance under the appropriate charging conditions, ensuring charging safety and efficiency while maximizing the cell voltage balancing effect.

[0053] Further, the first capacity node j is 40, the second capacity node h is 60, and the third capacity node k is 100. These three nodes accurately cover most new energy vehicle battery capacities on the market, allowing the charging pile to quickly and without mismatching the strategy without manual intervention, avoiding the use of high-power strategies for low-capacity batteries due to ambiguous capacity intervals, causing heating, or using low-power strategies for high-capacity batteries, resulting in charging overtime, and allowing each type of battery to achieve deep balancing under the most suitable curve.

[0054] In the present embodiment, the charging time t≤24, so that the maintenance time is controlled within 24 hours.

[0055] In the present embodiment, for the medium and high capacity states, the decrease of the intermediate section charging power is beneficial to the full charging of the battery. This rate of decrease is adopted to meet the requirement of completing charging within 24 hours, so as not to be too slow.

[0056] In the present embodiment, the battery capacity is the total capacity of the battery, i.e. the actual total capacity of the battery. For example, for a 100-degree battery in a vehicle, its battery capacity is 100 degrees.

[0057] Further, when the battery power is between 15% and 25%, the maintenance charging mode is selected to perform charging, preferably set to 20%. Limiting the starting power of the maintenance charging mode to 15%-25% (preferably 20%) can ensure that the maintenance conditions meet the requirements, and the cell balancing effect is more significant compared to non-low starting, further ensuring the fullness of the battery capacity.

[0058] In the present embodiment, the power curve graphs of the low-capacity charging strategy, the medium-capacity charging strategy, and the high-capacity charging strategy are as shown in Figures 2 to 4 Figures 2 to 4 In the present embodiment, the vertical axis represents power in kilowatts, and the horizontal axis represents time in hours. Embodiment Two:

[0059] As shown in Figure 1 A maintenance charging method for an alternating current charging pile, comprising the steps of:

[0060] Receiving battery information and charging mode information, the battery information including battery capacity, and the charging mode information including regular charging mode information and maintenance charging mode information:

[0061] When receiving the regular charging mode information, selecting the regular charging mode to perform charging, and when receiving the maintenance charging mode information, selecting the maintenance charging mode to perform charging;

[0062] After selecting the maintenance charging mode to perform charging, selecting a corresponding maintenance charging strategy according to the battery capacity, the maintenance charging strategy including at least three, corresponding to different battery capacities respectively. ​

[0063] In the technical architecture of the alternating current charging pile maintenance charging method, the primary implementation is the fundamental transformation of the alternating current charging pile function — from the traditional charging scene "passive reception of vehicle instructions, only bear the electric energy transmission" single role, upgrade to "active leading charging process, independent formulation of maintenance plan" core control role, this transformation completely breaks through the technical limitations of the existing charging technology which completely depends on the vehicle battery management system (BMS), effectively solving the key problem in the existing scheme that the vehicle BMS focuses on "quick energy supplement" and weakens the battery cell voltage balancing. Even if the BMS balancing logic of some vehicles has design defects or low priority, through this method, the alternating current charging pile can still provide efficient balancing management for the battery by relying on its own strategy formulation ability, without being subject to the control logic of the vehicle end.

[0064] At the same time, according to the battery capacity to select the corresponding maintenance charging strategy, and the number of maintenance charging strategies is at least three, which has strong adaptability — can accurately cover most of the capacity specifications of new energy vehicle batteries on the market (coverage ratio can reach more than 95% of common vehicle models), avoiding the problem that the existing general charging strategy cannot match the charging and discharging characteristics of batteries of different capacities, resulting in small capacity batteries being charged too fast, insufficient balancing time, or large capacity batteries taking too long to charge, low efficiency. For example, for small capacity batteries, the corresponding maintenance charging strategy will use relatively moderate power output and adaptive current (8-32A range for accurate control) to ensure sufficient balancing process; for large capacity batteries, through the optimized power curve design, the 20%-100% SOC charging period is efficiently completed within 24 hours, while sufficient time is reserved for battery cell balancing. This differentiated strategy based on battery capacity allows each type of battery to operate under adaptive charging conditions, ensuring that the battery management system has sufficient time to execute the cell voltage balancing algorithm, gradually reducing the voltage difference between single cells, and preventing battery capacity degradation caused by long-term voltage difference accumulation.

[0065] The above method promotes the single cell voltage of the battery to be stable and consistent through active control and differentiated adaptation, significantly improving the capacity saturation of the battery — compared to the traditional charging method relying on the vehicle BMS, after using this method, the battery can store more electric energy under the same SOC state, directly reflecting the improvement of vehicle range; long-term use can also slow down the battery capacity decay rate and prolong the overall service life of the battery. This not only brings users "enhanced range, durable battery" actual benefits, but also allows the alternating current charging pile to break through the functional boundaries of basic charging and add the value-added attribute of battery maintenance.

[0066] In a preferred embodiment, the maintenance charging strategy includes a low-capacity charging strategy, a medium-capacity charging strategy, and a high-capacity charging strategy, the power curve function under the low-capacity charging strategy is set as f1(x), the power curve function under the medium-capacity charging strategy is set as f2(x), the power curve function under the high-capacity charging strategy is set as f3(x), the battery capacity is a parameter a, the first capacity node is j, the second capacity node is h, and the third capacity node is k, and the following functions are provided:

[0067]

[0068] wherein a is a positive number, u is an input voltage, and t is a charging time.

[0069] In the technical architecture of the AC charging pile maintenance charging method, the primary implementation is the fundamental transformation of the AC charging pile function — from the traditional charging scene “passive reception of vehicle instructions, only bearing the role of power transmission” to the core control role “active leading of the charging process, independent formulation of the maintenance plan”. This transformation completely breaks through the technical limitations of the existing charging technology which completely depends on the vehicle battery management system (BMS), and effectively solves the key problem in the existing scheme that the vehicle BMS focuses on “fast energy supplement” and weakens the battery cell voltage balancing. Even if the BMS balancing logic of some vehicles has design defects or low priority, through this method, the AC charging pile can still provide efficient balancing management for the battery by virtue of its own strategy formulation ability, without being subject to the control logic of the vehicle end.

[0070] At the same time, the design of selecting the corresponding maintenance charging strategy according to the battery capacity, and the number of maintenance charging strategies being at least three, has strong adaptability — it can accurately cover most of the capacity specifications of new energy vehicle batteries on the market (covering more than 95% of common vehicle models), avoiding the problem that the existing general charging strategy cannot match the charging and discharging characteristics of different capacity batteries, resulting in small capacity batteries being charged too fast, insufficient balancing time, or large capacity batteries taking too long to charge, low efficiency. For example, for small capacity batteries, the corresponding maintenance charging strategy will use a relatively moderate power output and adaptive current (8-32A range for accurate control) to ensure sufficient balancing process; for large capacity batteries, through the optimized power curve design, the 20%-100% SOC charging period is efficiently completed within 24 hours, and sufficient time is reserved for battery cell balancing. This differentiated strategy based on battery capacity allows each type of battery to operate under adaptive charging conditions, ensuring that the battery management system has sufficient time to execute the cell voltage balancing algorithm, gradually reducing the voltage difference between single cells, and preventing battery capacity degradation caused by long-term accumulation of voltage difference.

[0071] The above method promotes the battery cell single voltage to be stable and consistent through the dual effects of active control and differentiated adaptation, significantly improves the capacity saturation of the battery - compared with the traditional charging method relying on the vehicle BMS, the battery can store more electric energy under the same SOC state after using the method, which directly reflects the improvement of the vehicle's range; Long-term use can also slow down the battery capacity decay rate and prolong the overall service life of the battery. This not only brings users the actual benefits of "range enhancement and battery durability", but also breaks the functional boundaries of basic charging for AC charging piles and adds the value-added attribute of battery maintenance.

[0072] Further, the first capacity node j is 40, the second capacity node h is 60, and the third capacity node k is 100. These three nodes accurately cover most new energy vehicle battery capacities on the market, allowing the charging pile to quickly and correctly match the strategy without manual intervention, avoiding the use of high-power strategies for low-capacity batteries that can cause heating, or the use of low-power strategies for high-capacity batteries that can cause charging to be delayed, and allowing each type of battery to achieve deep balancing under the most suitable curve.

[0073] In the present embodiment, the charging time t≤24, so that the maintenance time is controlled within 24 hours.

[0074] In the present embodiment, the battery capacity is not the actual capacity size of the battery, and the calculation method of the battery capacity is:

[0075] Obtain the total capacity and occupied capacity of the battery;

[0076] Calculate the remaining capacity: total capacity - occupied capacity;

[0077] Calculate the battery capacity = remaining capacity / (100% - maintenance preset remaining power).

[0078] The core technical principle of the above battery capacity calculation method is based on the "effective charging interval" (i.e. from the maintenance preset remaining power (such as 20%) to 100% SOC) of the maintenance charging, and through the actual remaining capacity of the current battery, the "equivalent calculation capacity" adapted to the interval is obtained. In the formula "battery capacity = remaining capacity ÷ (100% - maintenance preset remaining power)", "100% - maintenance preset remaining power" is essentially the SOC interval proportion (such as 80%) required for maintenance, which converts the "actual remaining capacity" (corresponding to the power from the current SOC to 100%) into "equivalent calculation capacity" (corresponding to the complete ideal interval power from 20% to 100%), so that the charging pile can match the corresponding maintenance strategy based on the equivalent capacity.

[0079] The design purpose is to solve the core pain point that users are difficult to accurately control the power at the ideal maintenance starting point of 20% in actual operation. Users often start the maintenance mode at a power higher than 20% (such as 35%, 55%) due to factors such as travel arrangement and charging habits. If the actual battery capacity matching strategy is directly used, it will cause strategy mismatch (such as using a large capacity strategy to supplement a small amount of power, resulting in insufficient balancing time) due to the "effective charging interval being compressed" (such as covering only 65% SOC from 35% to 100%, not the ideal 80%). Through this calculation method, the "remaining capacity of the non-ideal starting point" can be converted into "equivalent capacity of the ideal starting point", ensuring that the core basis of strategy matching changes from "actual physical capacity of the battery" to "the size of the power to be supplemented", which not only eliminates the need for users to adjust the power, but also guarantees the maintenance effect and efficiency.

[0080] The value can be more clearly reflected by combining specific examples: assuming that the actual capacity of the battery is 100 degrees and the maintenance preset remaining power is 20%. When the user starts maintenance at 35% power, the current remaining capacity is "100 degrees - (100 degrees x 35%) = 65 degrees" (i.e. 65 degrees of power needs to be supplemented from 35% to 100%), and the formula calculation gives "battery capacity = 65 degrees ÷ (100% - 20%) = 81.25 degrees" - this 81.25 degree equivalent capacity corresponds to the ideal scenario of "supplementing 81.25 degrees x 80% = 65 degrees of power from 20% to 100%", so the charging pile matches the "large capacity maintenance strategy" (adapted to the size of 65 degrees of power to be supplemented), and its "slow power reduction speed" can complete the supplement of 65 degrees of power within 21-24 hours, while providing sufficient time for BMS to balance the cell voltage; when the user starts maintenance at 55% power, the remaining capacity is "100 degrees - (100 degrees x 55%) = 45 degrees" (45 degrees of power needs to be supplemented from 55% to 100%), and the calculation gives "battery capacity = 45 degrees ÷ 80% = 56.25 degrees", which corresponds to the ideal scenario of "supplementing 56.25 degrees x 80% = 45 degrees of power from 20% to 100%", so the charging pile automatically switches to the "medium capacity maintenance strategy", and its "first maximum power fast charging, then gradually reducing power" design can efficiently supplement 45 degrees of power within 18-21 hours, avoiding both the interruption of balancing caused by excessive power and the extension of charging time caused by insufficient power.

[0081] As can be seen, through "equivalent capacity conversion", the maintenance strategy matching is always based on the "size of the power to be supplemented", so no matter how much the user's actual power deviates from 20%, the power curve can be accurately matched, which not only completely reduces the user's operation threshold (without the need to deliberately discharge to 20%), but also ensures that each maintenance can be based on reasonable power output to achieve cell voltage balancing.

[0082] Specifically, in the embodiment, the maintenance preset remaining power is set to 15%-25%, preferably 20%.

[0083] In the embodiment, the power curve of the low-capacity charging strategy, the medium-capacity charging strategy and the high-capacity charging strategy is as shown in the following figure: Figures 2 to 4 Figures 2 to 4 In the figure, the vertical coordinate is power, in kilowatts, and the horizontal coordinate is time, in hours. Embodiment three:

[0084] A maintenance charging system of an alternating current charging pile, comprising:

[0085] An information receiving unit, configured to receive battery information and charging mode information, the battery information including battery capacity, and the charging mode information including regular charging mode information and maintenance charging mode information;

[0086] A mode selecting unit, configured to select a regular charging mode to perform charging when receiving the regular charging mode information, and select a maintenance charging mode to perform charging when receiving the maintenance charging mode information;

[0087] A maintenance charging unit, configured to select a corresponding maintenance charging strategy according to the battery capacity after selecting the maintenance charging mode to perform charging, the maintenance charging strategy including at least three, corresponding to different battery capacities respectively.

[0088] The maintenance charging strategy includes a low-capacity charging strategy, a medium-capacity charging strategy and a high-capacity charging strategy, the power curve function under the low-capacity charging strategy is set as f1(x), the power curve function under the medium-capacity charging strategy is set as f2(x), the power curve function under the high-capacity charging strategy is set as f3(x), the battery capacity is a parameter a, the first capacity node is j, the second capacity node is h, and the third capacity node is k, and the following functions are provided:

[0089]

[0090] Wherein, a is a positive number, u is an input voltage, and t is a charging time. Embodiment four:

[0091] A maintenance charging device of an alternating current charging pile, applying the maintenance charging method of the alternating current charging pile or the maintenance charging system of the alternating current charging pile.

[0092] ​It is to be noted that, as used in this document, the term "indicates a relationship of, such as first and second, is merely used to differentiate one entity or action from another entity or action, and does not necessarily require or imply that there is any such actual relationship or order between these entities or actions. Moreover, the term "comprises", "comprising", or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by an "includes" or "comprising" statement does not exclude the existence of additional elements in the process, method, article, or apparatus that includes the element. Furthermore, in this document, "greater than", "less than", "exceeds", and the like are understood to not include the number itself; "above", "below", "within", and the like are understood to include the number itself.

[0093] In the above embodiments, the unit of the battery capacity is degree.

[0094] The above description of the embodiments is for the purpose of enabling one of ordinary skill in the art to make and use the application, and variations of the embodiments can readily be made by persons skilled in the art without departing from the spirit of the application. Therefore, the application is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the application without departing from the scope of the application should be within the scope of the protection of the application.

Claims

1. A maintenance and charging method for an AC charging pile, characterized in that, The method comprises the steps of: receiving battery information and charging mode information, the battery information including battery capacity, and the charging mode information including regular charging mode information and maintenance charging mode information; selecting a regular charging mode to perform charging when the regular charging mode information is received, and selecting a maintenance charging mode to perform charging when the maintenance charging mode information is received; selecting a corresponding maintenance charging strategy according to the battery capacity after selecting the maintenance charging mode to perform charging; the maintenance charging strategy includes a low-capacity charging strategy, a medium-capacity charging strategy, and a high-capacity charging strategy, a power curve function under the low-capacity charging strategy is set as f1(x), a power curve function under the medium-capacity charging strategy is set as f2(x), a power curve function under the high-capacity charging strategy is set as f3(x), the battery capacity is a parameter a, a first capacity node is j, a second capacity node is h, and a third capacity node is k, and the following functions are provided: ， wherein a is a positive number, u is an input voltage, and t is a charging time, wherein the unit of measurement of a is degree, the unit of measurement of u is v, and the unit of measurement of t is hour. 2.The method of claim 1, wherein The first capacity node j is 40, the second capacity node h is 60, and the third capacity node k is 100.

3. The maintenance and charging method for an AC charging pile according to claim 1, characterized in that, The charging time t is less than or equal to 24.

4. The method for maintaining and charging an alternating current charging post according to any one of claims 1 to 3, characterized in that, The battery capacity is the total capacity of the battery.

5. The maintenance and charging method for an AC charging pile according to claim 4, characterized in that, The maintenance charging mode is selected to perform charging only when the battery capacity is between 15% and 25%.

6. The method for maintaining and charging an alternating current charging post according to any one of claims 1 to 3, wherein The battery capacity is calculated in the following manner: obtaining the total capacity and the occupied capacity of the battery; calculating the remaining capacity: total capacity-occupied capacity; calculating the battery capacity = remaining capacity / (100%-maintenance preset remaining capacity).

7. The method of claim 6, wherein the AC charging pile is maintained in a charged state. The maintenance preset remaining capacity is set to 15%-25%.

8. A maintenance charging system for an alternating current charging post, characterized by The method comprises the steps of: an information receiving unit configured to receive battery information and charging mode information, the battery information including battery capacity, and the charging mode information including regular charging mode information and maintenance charging mode information; a mode selecting unit configured to select a regular charging mode to perform charging when the regular charging mode information is received, and select a maintenance charging mode to perform charging when the maintenance charging mode information is received; a maintenance charging unit configured to select a corresponding maintenance charging strategy according to the battery capacity after selecting the maintenance charging mode to perform charging; the maintenance charging strategy includes a low-capacity charging strategy, a medium-capacity charging strategy, and a high-capacity charging strategy, a power curve function under the low-capacity charging strategy is set as f1(x), a power curve function under the medium-capacity charging strategy is set as f2(x), a power curve function under the high-capacity charging strategy is set as f3(x), the battery capacity is a parameter a, a first capacity node is j, a second capacity node is h, and a third capacity node is k, and the following functions are provided: ， wherein a is a positive number, u is an input voltage, and t is a charging time, wherein the unit of measurement of a is degree, the unit of measurement of u is v, and the unit of measurement of t is hour.

9. A maintenance charging device for an alternating current charging post, characterized in that The maintenance charging method of the alternating current charging pile according to any one of claims 1 to 7 is applied, or the maintenance charging system of the alternating current charging pile according to claim 8 is applied.

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