Charging control method and device, computer equipment, storage medium and program product

Abstract

The invention relates to the technical field of battery charging, and discloses a charging control method and device, computer equipment, a storage medium and a program product, and the method comprises the steps: obtaining a plurality of preset ideal charging strategies, the maximum charging capability of the charging equipment, and the current demand current and the current charge state of a to-be-charged battery; determining an optimal charging strategy in multiple ideal charging strategies according to the maximum charging capability and the current demand current; and controlling the charging process of the to-be-charged battery according to the current charge state and the optimal charging strategy. According to the method, the charging strategy is adjusted according to the capacity of the charging equipment, the overall charging strategy can be flexibly adjusted on the basis of dynamically adjusting the charging process, the charging capacity of the charging equipment is fully utilized, the safety of battery operation is ensured within the lithium precipitation boundary of the battery core, and the charging time is effectively saved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery charging, and in particular to a charging control method, device, computer equipment, storage medium and program product. Background Art

[0002] The continuous charging map for battery cells is a charging strategy based on test data from the three electrodes of the cell, taking into account cell safety and minimizing charging time. Generally, the current is high during the initial charging phase. As the cell charge increases, the negative electrode potential decreases. To avoid lithium deposition and damage to the cell caused by overcharging, the current is gradually reduced. When charging the battery pack, the battery management system (BMS) obtains the charging current value based on the changes in the SOC (State of Charge) and sends a request to the charging station, charging with the smaller value of the requested current and the actual current available.

[0003] However, in the existing technology, the same battery cell corresponds to battery packs of various specifications. The same battery pack can work with charging guns of various specifications, but each battery cell only provides one continuous charging map, which makes it impossible for the battery pack to change the charging steps according to the actual charging gun capacity, resulting in a waste of charging time. Summary of the Invention

[0004] In view of this, the present invention provides a charging control method, apparatus, computer equipment, storage medium and program product to solve the problem that battery charging cannot be flexibly adjusted according to the capacity of the charging pile.

[0005] In a first aspect, the present invention provides a charging control method, which includes: obtaining a plurality of pre-set ideal charging strategies, the maximum charging capacity of the charging device, and the current demand current and current state of charge of the battery to be charged; determining the best charging strategy among the plurality of ideal charging strategies based on the maximum charging capacity and the current demand current; and controlling the charging process of the battery to be charged based on the current state of charge and the best charging strategy.

[0006] The charging control method provided by the present invention pre-sets multiple ideal charging strategies, determines the optimal charging strategy among these strategies based on the maximum charging capacity of the charging device and the current current demand of the battery to be charged, and controls the charging process of the battery to be charged based on the current state of charge of the battery to be charged and the optimal charging strategy. By adjusting the charging strategy based on the capabilities of the charging device, the present invention can flexibly adjust the overall charging strategy based on dynamic adjustment of the charging process, fully utilizing the charging capacity of the charging device, ensuring battery operation safety within the lithium plating boundary of the battery cell, and effectively reducing charging time.

[0007] In an optional embodiment, the setting process of the ideal charging strategy includes: charging the battery to be charged according to the initial charging rate, and performing a three-electrode test on the battery to be charged during the charging process; obtaining the real-time state of charge and real-time negative electrode potential of the battery to be charged, and judging whether the real-time negative electrode potential reaches a preset threshold value, and if it reaches the preset threshold value, reducing the initial charging rate; charging the battery to be charged according to the target charging rate after the reduction, and returning to the step of judging whether the real-time negative electrode potential reaches the preset threshold value until charging is completed; determining the corresponding ideal charging strategy according to the real-time state of charge, initial charging rate and target charging rate during the charging process; obtaining multiple ideal charging strategies based on different initial charging rates, and determining the main charging strategy among the multiple ideal charging strategies.

[0008] The present invention performs charging tests on the battery at different charging rates in advance, and can determine corresponding charging strategies according to the electrochemical polarization properties of the battery at different charging rates, thereby avoiding lithium plating problems that may cause damage to the battery cell.

[0009] In an optional embodiment, the best charging strategy among multiple ideal charging strategies is determined based on the maximum charging capacity and the current demand current, including: judging whether the maximum charging capacity is greater than or equal to the current demand current; if the maximum charging capacity is less than the current demand current, determining the best charging rate based on the maximum charging capacity and the current demand current; matching the best charging rate with the initial charging rate corresponding to each ideal charging strategy to determine the best charging strategy.

[0010] When the charging capacity of the charging device is insufficient, the present invention determines the optimal charging strategy according to the charging capacity of the charging device. On the basis of a small charging current in the early stage and within the lithium plating boundary of the battery cell, the current limit in the later stage can be released, thereby effectively saving charging time.

[0011] In an optional embodiment, determining an optimal charging strategy among multiple ideal charging strategies based on the maximum charging capacity and the current demand current also includes: if the maximum charging capacity is greater than or equal to the current demand current, determining whether aggressive charging is allowed; if aggressive charging is not allowed, using the main charging strategy as the optimal charging strategy; if aggressive charging is allowed, determining an optimal charging rate based on the maximum charging capacity and the current demand current; and matching the optimal charging rate with an initial charging rate corresponding to the ideal charging strategy to determine the optimal charging strategy.

[0012] When the charging capacity of the charging device is sufficient, the present invention determines the optimal charging strategy according to the charging capacity of the charging device and the battery performance, which can achieve fast charging, further shorten the charging time, and meet the user's demand for fast charging.

[0013] In an optional embodiment, before obtaining the maximum charging capacity of the charging device and the current required current and current state of charge of the battery to be charged, it also includes: generating a first charging current request based on the current state of charge and the main charging strategy, and sending the first charging current request to the charging device.

[0014] The present invention communicates with the charging pile in advance according to the main body charging strategy. When the optimal charging strategy cannot be determined, the charging current can be requested according to the normal charging demand of the battery, thereby obtaining the charging capacity of the charging pile through communication and ensuring the safe operation of the battery.

[0015] In an optional embodiment, the charging process of the rechargeable battery is controlled according to the current state of charge and the optimal charging strategy, including: determining the current charging rate according to the current state of charge and the optimal charging strategy; generating a second charging current request based on the current charging rate, and sending the second charging current request to the charging device, so that the charging device charges the rechargeable battery according to the second charging current request and the current charging rate.

[0016] Under the optimal charging strategy, the present invention determines the current charging rate according to the current state of charge, and can adjust the charging process according to the battery power, avoiding the lithium plating problem caused by continuing high-current charging when the battery power increases and the negative electrode potential decreases, thereby ensuring the safety of battery operation.

[0017] In a second aspect, the present invention provides a charging control device, which includes: an information acquisition module for obtaining a plurality of pre-set ideal charging strategies, the maximum charging capacity of the charging device, and the current demand current and current state of charge of the battery to be charged; a strategy selection module for determining the best charging strategy among the plurality of ideal charging strategies based on the maximum charging capacity and the current demand current; and a charging control module for controlling the charging process of the battery to be charged based on the current state of charge and the best charging strategy.

[0018] In a third aspect, the present invention provides a computer device comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to thereby execute the charging control method of the first aspect or any corresponding embodiment thereof.

[0019] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the charging control method of the first aspect or any corresponding embodiment thereof.

[0020] In a fifth aspect, the present invention provides a computer program product, comprising computer instructions, which are used to enable a computer to execute the charging control method of the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 is a flow chart of a charging control method according to an embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of a specific flow chart of a charging control method according to an embodiment of the present invention;

[0024] Figure 3 is a flow chart of another charging control method according to an embodiment of the present invention;

[0025] Figure 4 is a map diagram of another charging control method according to an embodiment of the present invention;

[0026] Figure 5 is a flow chart of another charging control method according to an embodiment of the present invention;

[0027] Figure 6 is a structural block diagram of a charging control device according to an embodiment of the present invention;

[0028] Figure 7 Schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0030] The embodiments of the present invention are applicable to scenarios where charging is performed on passenger cars or commercial vehicles using charging stations / charging guns. Related technologies stipulate that during the charging process, to quickly increase the battery's charge level, a higher current is used in the initial stages of charging, thereby shortening the charging time and improving charging efficiency. This is because the battery is at a lower charge level during the initial charging phase and can withstand a higher current input. This higher current can replenish the battery in a shorter period of time. As the battery cell's charge level gradually increases, the negative electrode potential decreases. This decrease in negative electrode potential indicates a change in the electrochemical environment within the battery, leading to lithium plating. Lithium plating occurs when lithium ions deposit on the negative electrode surface to form metallic lithium during charging, which can have a significant impact on battery performance and safety. When the negative electrode potential decreases to a certain level, the rate of lithium ion deposition on the negative electrode surface accelerates, increasing the risk of lithium plating. Therefore, to avoid lithium plating, the charging current needs to be gradually reduced. A lower charging current can reduce the rate of lithium ion deposition on the negative electrode surface, thereby reducing the likelihood of lithium plating. This effectively protects the battery cell and extends the battery's lifespan. During the actual charging process, the pre-stored continuous charging map (corresponding charging strategy) communicates with the charging pile to monitor the battery status and parameters in real time, and reasonably adjusts the charging current based on information such as the battery power level and negative electrode potential.

[0031] However, if only one Map is stored, the battery cannot change the charging steps according to the actual charging gun's capabilities. At present, batteries usually contain at least one cell, thus forming different battery pack architectures, such as 1-in-1, 2-in-1, or 3-in-1. For example, a 200Ah (ampere-hour), 2-in-1 battery pack (containing two batteries, each with a capacity of 200Ah). If the charging strategy of current limiting after charging to 80% at 1C is followed, it can only be charged at a maximum current of 0.5C under a 200A charging gun, and can only be charged at a maximum current of 0.75C under a 300A charging gun. It can be charged at a maximum charging current of 1C under a 400A charging gun, but the current limiting conditions of the three after 80% SOC are the same. As for the capacity of the battery cell itself, the charging current is small in the early stage, the polarization of the charging process is small, and the current that can be tolerated in the later stage is also greater; so for the charging condition of less than 1C in the early stage, if the current limit is released in the last 10-20% SOC (the charging rate in the high SOC state close to the full power state is often very low, which has a great impact on the charging time), the charging time can be effectively saved, and the safety of the battery operation is guaranteed within the lithium plating boundary of the battery cell. In addition, the same battery cell will also correspond to different battery pack architectures, such as 1-parallel, 2-parallel, and 3-parallel battery pack architectures. Then, the same 200A charging pile (taking 200Ah battery cell as an example) has a maximum charging capacity of 1C, 1 / 2C, and 1 / 3C respectively. Only one set of charging Maps will greatly limit the charging capacity, resulting in a waste of charging time. Therefore, an embodiment of the present invention provides a charging control method, which achieves the effect of saving charging time by providing different ideal charging strategies to achieve charging according to the optimal charging strategy.

[0032] According to an embodiment of the present invention, an embodiment of a charging control method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0033] In this embodiment, a charging control method is provided, which can be used in the BMS system of the above-mentioned vehicle. Figure 1 is a flow chart of a charging control method according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0034] Step S101 , obtaining a plurality of preset ideal charging strategies, the maximum charging capacity of the charging device, and the current required current and current state of charge of the battery to be charged.

[0035] Specifically, in an embodiment of the present invention, a three-electrode test charging matrix is used in advance to measure the charging process of the battery to be charged at different charging rates. Among them, the three-electrode system consists of a working electrode, a reference electrode and a counter electrode. The working electrode is the core of the research and is used to test the performance of the battery's active materials; the reference electrode provides a stable potential reference and can accurately measure the potential of the working electrode; the counter electrode forms a loop with the working electrode to ensure the transmission of electrons. For example, in lithium-ion battery research, lithium ion insertion and deinsertion reactions can be carried out on the working electrode, the reference electrode can accurately measure the potential change of the electrode, and the counter electrode assists in completing the electrochemical reaction. In an embodiment of the present invention, the negative electrode of the battery to be charged serves as the working motor. At this time, by comparing with the reference electrode, the potential change of the negative electrode can be accurately measured to understand its reaction kinetics and electrochemical activity under different conditions. For example, when studying the lithium insertion and delithiation processes of the negative electrode of a lithium-ion battery (such as a graphite negative electrode), the negative electrode is used as the working electrode, the reference electrode (such as a lithium sheet as a reference electrode) provides a stable potential reference, and the counter electrode is usually selected from materials that can provide electron transfer (such as lithium sheets, etc.), thus forming a complete three-electrode system to study the performance of the negative electrode.

[0036] In some optional embodiments, the embodiments of the present invention respectively test the charging potential change with charging rates of 2C, 1.75C, 1.5C, 1.25C, 1C, 0.75C and 0.5C as the initial charging current, adjust the charging rate according to the charging potential change during the charging process, and record the SOC of the battery at this time, so as to formulate a charging map under different initial charging rates, that is, an ideal charging strategy. According to the electrochemical polarization properties of the lithium battery, under each ideal charging strategy, the larger the initial current, the more severe the polarization, and the smaller the current limit required at a high SOC close to the fully charged state, that is, the larger the current in the early stage, the faster the charging, and the smaller the current limit in the later stage, the slower the charging.

[0037] In some optional implementations, multiple continuous charging maps are stored in the BMS system, and the main map (main charging strategy) is determined according to the capacity of the battery to be charged. Figure 2 As shown, the system first requests the charging pile current using the charging current limit of the main map. It also obtains multiple charging maps and the current state of charge of the battery to be charged. It then communicates with the charging pile to determine the maximum charging capacity of the charging device and the current current demand of the battery to be charged. For example, the maximum charging capacity of the charging device, using the charging pile as an example, refers to the maximum power or maximum charging current and voltage the charging pile can provide to the vehicle battery under specific conditions, such as 200A. The current current demand of the battery to be charged corresponds to the total capacity of all cells in the battery to be charged. For example, for a 200Ah, 2-in-1 battery pack, the current demand is 400A.

[0038] Step S102 : determining an optimal charging strategy among multiple ideal charging strategies according to the maximum charging capacity and the current demand current.

[0039] Specifically, in the embodiment of the present invention, there are various specifications of charging piles and battery packs on the market. Therefore, in order to shorten the charging time as much as possible, based on the different ideal charging strategies that have been determined, the optimal charging strategy is determined by matching the maximum charging capacity of the charging gun with the current demand current of the battery to be charged. Figure 2 As shown in the figure, the maximum charging capacity of the charging pile may be greater than the current demand current of the battery to be charged, or it may be equal to or less than the current demand current of the battery to be charged. The optimal charging strategy needs to be determined according to different situations to make full use of the charging capacity of the charging pile.

[0040] Step S103 : controlling the charging process of the battery to be charged according to the current state of charge and the optimal charging strategy.

[0041] Specifically, in the embodiment of the present invention, the charging rate corresponding to each ideal charging strategy is not fixed, but is determined according to the change of charging potential during the early stage of testing through the three-electrode test charging matrix. The change of charging rate in different ideal charging strategies is different, and different charge states in the same ideal charging strategy correspond to the same or different charging rates. Figure 2 As shown, if the maximum charging capacity is greater than the current demand current, then, if an aggressive charging plan is allowed, the optimal charging strategy is the aggressive plan, which is used to quickly charge the battery to be charged. If the aggressive charging plan is not allowed, charging continues according to the main map. If the maximum charging capacity is less than the current demand current, the plan with the shortest charging time at the maximum charging capacity is calculated based on the number of battery packs connected in parallel, and this is used as the optimal charging plan for charging the battery to be charged. In this case, the optimal charging strategy can appropriately relax the charging current limit in the later stages of charging.

[0042] The charging control method provided by the present invention pre-sets multiple ideal charging strategies, determines the optimal charging strategy among these strategies based on the maximum charging capacity of the charging device and the current current demand of the battery to be charged, and controls the charging process of the battery to be charged based on the current state of charge of the battery to be charged and the optimal charging strategy. By adjusting the charging strategy based on the capabilities of the charging device, the present invention can flexibly adjust the overall charging strategy based on dynamic adjustment of the charging process, fully utilizing the charging capacity of the charging device, ensuring battery operation safety within the lithium plating boundary of the battery cell, and effectively reducing charging time.

[0043] In this embodiment, a charging control method is provided, which can be used in the BMS system of the above-mentioned vehicle. Figure 3 is a flow chart of a charging control method according to an embodiment of the present invention. Figure 3 As shown, the process includes the following steps:

[0044] Step S301 , obtaining a plurality of preset ideal charging strategies, the maximum charging capacity of the charging device, and the current required current and current state of charge of the battery to be charged.

[0045] Specifically, the above step S301 includes:

[0046] Step S3011 , charging the rechargeable battery according to the initial charging rate, and performing a three-electrode test on the rechargeable battery during the charging process.

[0047] Specifically, in an embodiment of the present invention, a three-electrode test charging matrix was constructed using 2C, 1.75C, 1.5C, 1.25C, 1C, 0.75C, and 0.5C as initial charge rates to charge a battery. During the charging process, the negative electrode of the battery served as the working electrode, while the reference electrode provided a stable and accurate potential reference. A high-precision potential measuring instrument recorded the potential change of the working electrode relative to the reference electrode in real time, thereby monitoring the potential of the negative electrode of the battery in real time.

[0048] Step S3012, obtaining the real-time state of charge and real-time negative electrode potential of the battery to be charged, and determining whether the real-time negative electrode potential reaches a preset threshold. If it reaches the preset threshold, the initial charging rate is reduced.

[0049] Specifically, in an embodiment of the present invention, the real-time state of charge of the battery to be charged and the real-time negative electrode potential detected during the charging process are obtained, and it is determined whether the real-time negative electrode potential reaches a preset threshold. When the battery starts to charge, lithium ions are released from the positive electrode and migrate to the negative electrode through the electrolyte. At this time, the negative electrode potential will drop rapidly, because the reduction reaction of lithium ions on the surface of the negative electrode begins to occur, and electrons flow into the negative electrode, lowering its potential. During the continuous charging process, the negative electrode potential continues to decrease. If the negative electrode potential drops to a lower threshold, if charging continues at this time, the negative electrode potential may further drop to the lithium precipitation potential, resulting in lithium precipitation, which seriously affects the performance and safety of the battery. Therefore, it is necessary to determine whether the real-time negative electrode potential reaches the preset threshold. The preset threshold can be set to 0V, which is only used as an example and is not limited to this.

[0050] In some optional embodiments, when the real-time negative electrode potential reaches a preset threshold, the initial charge rate is reduced to a target charge rate, with the degree of reduction determined based on the state of charge of the battery to be charged or based on actual experience. When the charge rate is reduced, the negative electrode potential will rise to a certain extent.

[0051] Step S3013: Charge the battery to be charged according to the reduced target charging rate, and return to the step of determining whether the real-time negative electrode potential reaches a preset threshold value until charging is completed.

[0052] Specifically, in this embodiment of the present invention, when the battery to be recharged continues to be charged at the reduced target charge rate, lithium plating continues to occur, causing the negative electrode potential to drop. Therefore, the real-time negative electrode potential is continuously determined to see if it reaches a preset threshold. If so, the charge rate is further reduced. This cycle continues until charging is complete, ensuring the safety of the battery.

[0053] Step S3014: determining a corresponding ideal charging strategy according to the real-time state of charge, the initial charging rate, and the target charging rate during the charging process.

[0054] Specifically, in an embodiment of the present invention, during the above charging process, the real-time state of charge of the battery, the initial charging rate, and the target charging rate after each decrease are recorded, so as to construct a Map corresponding to the ideal charging strategy.

[0055] Step S3015 , obtaining multiple ideal charging strategies based on different initial charging rates, and determining a main charging strategy among the multiple ideal charging strategies.

[0056] Specifically, in the embodiment of the present invention, the battery to be charged is charged at different charging rates. Because the initial charging rates are different, the lithium electron deposition speed is different, and the corresponding negative electrode potential decrease rate is different, so multiple ideal charging strategies can be obtained in the end. The embodiment of the present invention takes the ideal charging strategy with an initial charging rate of 1C as the main charging strategy, that is, the main Map is determined in advance, such as Figure 4 shown.

[0057] Step S302 : determining an optimal charging strategy among multiple ideal charging strategies according to the maximum charging capacity and the current demand current.

[0058] Specifically, the above step S302 includes:

[0059] Step S3021: determine whether the maximum charging capacity is greater than or equal to the current demand current.

[0060] Specifically, in this embodiment of the present invention, before determining the optimal charging strategy, the charging pile current is requested using the charging limit current corresponding to the master map, corresponding to the current demand of the battery to be charged. During this process, the maximum charging capacity of the charging pile output current is determined by communicating with the charging pile, and whether the maximum charging capacity of the charging pile is greater than or equal to the current demand current.

[0061] Step S3022: If the maximum charging capacity is less than the current demand current, determine the optimal charging rate according to the maximum charging capacity and the current demand current.

[0062] Specifically, in an embodiment of the present invention, if the maximum charging capacity of the charging pile is less than the current demand current of the battery to be charged, it proves that the charging pile cannot charge the battery to be charged according to normal demand, so it is necessary to calculate the solution with the shortest charging time under this capacity. The embodiment of the present invention determines the optimal charging rate, that is, the maximum charging rate that the charging pile can provide, by calculating the ratio of the maximum charging capacity to the current demand current. For example, if the maximum charging capacity of the charging pile is 200A and the current demand current of the battery to be charged is 400A, the optimal charging rate is 200A / 400A=0.5C.

[0063] Step S3023 , matching the optimal charging rate with the initial charging rate corresponding to each ideal charging strategy to determine the optimal charging strategy.

[0064] Specifically, in the embodiment of the present invention, the calculated optimal charging rate is matched with the initial charging rate in the Map corresponding to each ideal charging strategy to determine the optimal charging strategy. Figure 4 As shown, the initial charge rate of the main Map is 1C, the initial charge rate of Map-2 is 0.5, and the initial charge rate of Map-3 is 1.2C. If the calculated optimal charge rate is 0.5C, Map-2 is used as the optimal charging strategy. This is for example only and is not limited to this. In actual operation, if the calculated optimal charge rate is different from the initial charge rate in each Map, the Map with the closest optimal charge rate is used as the optimal charging strategy.

[0065] Step S303 : controlling the charging process of the battery to be charged according to the current state of charge and the optimal charging strategy.

[0066] Specifically, the above step S303 includes:

[0067] Step S3031: Determine the current charging rate according to the current state of charge and the optimal charging strategy.

[0068] Specifically, in this embodiment of the present invention, the charge rates corresponding to different SOCs in each Map are the same or different, with a higher charge rate in the early stages of charging and a lower charge rate in the later stages. Therefore, during the charging process, the current state of charge of the battery to be charged is obtained in real time, and the current charge rate is determined by looking up the Map corresponding to the optimal charging strategy. For example, if the optimal charging strategy is Map-2 and the current state of charge is 10%, the current charge rate is 0.5C. This is for example only and is not intended to be limiting.

[0069] Step S3032: Generate a second charging current request based on the current charging rate, and send the second charging current request to the charging device, so that the charging device charges the battery to be charged according to the second charging current request and the current charging rate.

[0070] Specifically, in an embodiment of the present invention, taking the current demand current of 400A and the current charging rate of 0.5C as an example, a charging current request of 200A is generated, so that the charging device charges the battery to be charged according to the output current of 200A. At this time, the corresponding charging rate is 0.5C. During the charging process, the state of charge of the battery to be charged increases, and when it is between 90% and 100%, the current charging rate is determined to be 0.4C. By comparing with the main Map, it can be seen that under normal circumstances, the charging rate is 0.3C when the state of charge is 80%-90%, and the charging rate is 0.1 when it is 90%-100%. Therefore, charging according to Map-2 can relax the charging current limit to a certain extent after reaching the late stage of charging, thereby shortening the charging time.

[0071] The charging control method provided by the present invention pre-sets multiple ideal charging strategies, determines the optimal charging strategy among these strategies based on the maximum charging capacity of the charging device and the current current demand of the battery to be charged, and controls the charging process of the battery to be charged based on the current state of charge of the battery to be charged and the optimal charging strategy. By adjusting the charging strategy based on the capabilities of the charging device, the present invention can flexibly adjust the overall charging strategy based on dynamic adjustment of the charging process, fully utilizing the charging capacity of the charging device, ensuring battery operation safety within the lithium plating boundary of the battery cell, and effectively reducing charging time.

[0072] In this embodiment, a charging control method is provided, which can be used in the BMS system of the above-mentioned vehicle. Figure 5 is a flow chart of a charging control method according to an embodiment of the present invention. Figure 5 As shown, the process includes the following steps:

[0073] Step S501: Obtain multiple preset ideal charging strategies, the maximum charging capacity of the charging device, the current required current of the battery to be charged, and the current state of charge. Figure 3 Step S301 of the illustrated embodiment will not be described in detail here.

[0074] Step S502 : determining an optimal charging strategy among multiple ideal charging strategies according to the maximum charging capacity and the current demand current.

[0075] Specifically, the above step S502 includes:

[0076] Step S5021: Determine whether the maximum charging capacity is greater than or equal to the current required current. Figure 3 Step S3021 of the illustrated embodiment will not be described in detail here.

[0077] Step S5022: If the maximum charging capacity is greater than or equal to the current demand current, determine whether aggressive charging is allowed.

[0078] Specifically, in an embodiment of the present invention, high-charging-capacity charging piles are currently available on the market, based on the needs of different users. Common charging piles on the market are 500A, while 600 / 700A charging piles have also been developed. When charging a battery to be charged, if it is determined that the maximum charging capacity of the charging pile is greater than or equal to the current current demand of the battery to be charged, it indicates that the charging pile supports fast charging. However, the charging pile's charging capacity can only be fully utilized if the battery to be charged allows fast charging; otherwise, damage to the battery will occur.

[0079] Step S5023: If aggressive charging is not allowed, the main charging strategy is used as the optimal charging strategy.

[0080] Specifically, in an embodiment of the present invention, if the battery to be charged does not allow aggressive charging at this time (which can be selected by the user or pre-set), the theme charging strategy is directly used as the optimal charging strategy, that is, the charging time is shortened to the greatest extent within the tolerance range of the battery to be charged.

[0081] Step S5024: If aggressive charging is allowed, an optimal charging rate is determined based on the maximum charging capacity and the current demand current; the optimal charging rate is matched with the initial charging rate corresponding to the ideal charging strategy to determine the optimal charging strategy.

[0082] Specifically, in an embodiment of the present invention, if charging is allowed, the ratio of the maximum charging capacity of the charging pile to the current demand of the battery to be charged can be calculated to determine the maximum charging rate that the charging pile can provide at this time. This is used as the optimal charging rate, and the optimal charging rate is matched with the initial charging rate of each Map to determine the corresponding optimal charging strategy. In addition, in actual operation, there may be a situation where the battery to be charged allows aggressive charging, but the charging capacity of the charging pile is too large for the battery to be charged. Therefore, the maximum demand current or maximum charging rate of the battery to be charged can be set in advance, so that the optimal charging strategy is determined according to the maximum demand current or the corresponding maximum charging rate.

[0083] The charging control method provided by the present invention pre-sets multiple ideal charging strategies, determines the optimal charging strategy among these strategies based on the maximum charging capacity of the charging device and the current current demand of the battery to be charged, and controls the charging process of the battery to be charged based on the current state of charge of the battery to be charged and the optimal charging strategy. By adjusting the charging strategy based on the capabilities of the charging device, the present invention can flexibly adjust the overall charging strategy based on dynamic adjustment of the charging process, fully utilizing the charging capacity of the charging device, ensuring battery operation safety within the lithium plating boundary of the battery cell, and effectively reducing charging time.

[0084] This embodiment also provides a charging control device for implementing the above-mentioned embodiments and preferred embodiments. Details already described will not be repeated. As used below, the term "module" may refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

[0085] This embodiment provides a charging control device, such as Figure 6 Shown, including:

[0086] The information acquisition module 601 is used to obtain a plurality of preset ideal charging strategies, the maximum charging capacity of the charging device, and the current required current and current state of charge of the battery to be charged.

[0087] The strategy selection module 602 is configured to determine the best charging strategy among multiple ideal charging strategies according to the maximum charging capability and the current demand current.

[0088] The charging control module 603 is used to control the charging process of the battery to be charged according to the current state of charge and the optimal charging strategy.

[0089] In some optional implementations, the device further includes: a policy setting module, the policy setting module including:

[0090] The charging test unit is used to charge the rechargeable battery according to the initial charging rate and perform a three-electrode test on the rechargeable battery during the charging process.

[0091] The rate adjustment unit is used to obtain the real-time state of charge and real-time negative electrode potential of the battery to be charged, and to determine whether the real-time negative electrode potential reaches a preset threshold. If the preset threshold is reached, the initial charging rate is reduced.

[0092] The cycle adjustment unit is used to charge the battery to be recharged according to the reduced target charging rate and return to the step of determining whether the real-time negative electrode potential reaches a preset threshold until charging is completed.

[0093] The strategy determination unit is used to determine the corresponding ideal charging strategy according to the real-time state of charge, initial charging rate and target charging rate during the charging process.

[0094] The main strategy determination unit is used to obtain multiple ideal charging strategies based on different initial charging rates and determine the main charging strategy among the multiple ideal charging strategies.

[0095] In some optional implementations, the strategy selection module 602 includes:

[0096] The capacity judgment unit is used to judge whether the maximum charging capacity is greater than or equal to the current demand current.

[0097] The rate calculation unit is used to determine the optimal charging rate based on the maximum charging capacity and the current demand current if the maximum charging capacity is less than the current demand current.

[0098] The first strategy matching unit is used to match the optimal charging rate with the initial charging rate corresponding to each ideal charging strategy to determine the optimal charging strategy.

[0099] In some optional implementations, the strategy selection module 602 further includes:

[0100] The fast charging judgment unit is used to determine whether aggressive charging is allowed if the maximum charging capacity is greater than or equal to the current demand current.

[0101] The second strategy matching unit is configured to use the main charging strategy as the optimal charging strategy if aggressive charging is not allowed.

[0102] The third strategy matching unit is used to determine the optimal charging rate based on the maximum charging capacity and the current demand current if aggressive charging is allowed; match the optimal charging rate with the initial charging rate corresponding to the ideal charging strategy to determine the optimal charging strategy.

[0103] In some optional embodiments, the device further comprises:

[0104] The first charging request unit is configured to generate a first charging current request according to a current state of charge and a main body charging strategy, and send the first charging current request to a charging device.

[0105] In some optional implementations, the charging control module 603 includes:

[0106] The rate determination unit is used to determine the current charging rate according to the current state of charge and the optimal charging strategy.

[0107] The second charging request unit is used to generate a second charging current request based on the current charging rate, and send the second charging current request to the charging device, so that the charging device charges the battery to be charged according to the second charging current request and the current charging rate.

[0108] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0109] The charging control device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0110] The embodiment of the present invention also provides a computer device having the above Figure 6 The charging control device shown.

[0111] See also Figure 7 , Figure 7 is a structural diagram of a computer device provided by an optional embodiment of the present invention, such as Figure 7 As shown, the computer device includes: one or more processors 10, memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components utilize different buses to communicate with each other and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in the memory or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Equally, multiple computer devices can be connected, and each device provides part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 7 A processor 10 is taken as an example.

[0112] The processor 10 may be a central processing unit, a network processor, or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic, or any combination thereof.

[0113] The memory 20 stores instructions that can be executed by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0114] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created based on the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0115] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0116] The computer device further includes a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0117] The embodiment of the present invention also provides a computer-readable storage medium. The above-mentioned method according to the embodiment of the present invention can be implemented in hardware, firmware, or implemented as a computer code that can be recorded in a storage medium, or implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and downloaded through a network and will be stored in a local storage medium, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state drive, etc.; further, the storage medium can also include a combination of the above-mentioned types of memory. It can be understood that a computer, a processor, a microprocessor controller or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor or hardware, the method shown in the above embodiment is implemented.

[0118] A portion of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the form in which the computer program instruction exists in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc. Accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium that can be accessed by the computer.

[0119] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A charging control method, characterized in that: The method comprises: Obtain multiple pre-set ideal charging strategies, the maximum charging capacity of the charging device, and the current required current and current state of charge of the battery to be charged; determining an optimal charging strategy among multiple ideal charging strategies according to the maximum charging capacity and the current demand current; The charging process of the battery to be charged is controlled according to the current state of charge and the optimal charging strategy.

2. The method according to claim 1, characterized in that The process of setting the ideal charging strategy includes: Charging the battery to be charged according to an initial charging rate, and performing a three-electrode test on the battery to be charged during the charging process; Obtaining a real-time state of charge and a real-time negative electrode potential of the battery to be charged, and determining whether the real-time negative electrode potential reaches a preset threshold value, and if so, reducing the initial charge rate; charging the battery to be charged according to the reduced target charging rate, and returning to the step of determining whether the real-time negative electrode potential reaches a preset threshold value until charging is completed; Determine a corresponding ideal charging strategy according to the real-time state of charge, the initial charging rate, and the target charging rate during the charging process; A plurality of ideal charging strategies are obtained based on different initial charging rates, and a main charging strategy among the plurality of ideal charging strategies is determined.

3. The method according to claim 2, characterized in that The determining of the optimal charging strategy among multiple ideal charging strategies according to the maximum charging capability and the current demand current includes: Determining whether the maximum charging capacity is greater than or equal to the current demand current; If the maximum charging capacity is less than the current demand current, determining the optimal charging rate according to the maximum charging capacity and the current demand current; The optimal charging rate is matched with the initial charging rate corresponding to each ideal charging strategy to determine the optimal charging strategy.

4. The method according to claim 3, characterized in that The determining of the optimal charging strategy among multiple ideal charging strategies according to the maximum charging capacity and the current demand current further includes: If the maximum charging capacity is greater than or equal to the current demand current, determining whether aggressive charging is allowed; If aggressive charging is not allowed, the main charging strategy is used as the optimal charging strategy; If aggressive charging is allowed, an optimal charging rate is determined based on the maximum charging capacity and the current demand current; the optimal charging rate is matched with an initial charging rate corresponding to the ideal charging strategy to determine the optimal charging strategy.

5. The method according to claim 2, characterized in that Before obtaining the maximum charging capacity of the charging device and the current required current and current state of charge of the battery to be charged, the following steps are also required: A first charging current request is generated according to the current state of charge and the main body charging strategy, and the first charging current request is sent to the charging device.

6. The method according to claim 1, characterized in that The controlling the charging process of the battery to be charged according to the current state of charge and the optimal charging strategy includes: Determining a current charging rate according to the current state of charge and the optimal charging strategy; A second charging current request is generated based on the current charging rate, and the second charging current request is sent to the charging device, so that the charging device charges the battery to be charged according to the second charging current request and the current charging rate.

7. A charging control device, characterized in that: The device comprises: An information acquisition module is used to obtain a plurality of preset ideal charging strategies, the maximum charging capacity of the charging device, and the current required current and current state of charge of the battery to be charged; a strategy selection module, configured to determine an optimal charging strategy among multiple ideal charging strategies based on the maximum charging capacity and the current demand current; A charging control module is used to control the charging process of the battery to be charged according to the current state of charge and the optimal charging strategy.

8. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the charging control method according to any one of claims 1 to 6 by executing the computer instructions.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the charging control method according to any one of claims 1 to 6.

10. A computer program product, characterized in that The method comprises computer instructions for causing a computer to execute the charging control method according to any one of claims 1 to 6.

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