Charging control method and device, storage medium, battery system and aircraft

Abstract

The embodiment of the invention provides a charging control method and device, a storage medium, a battery system and an aircraft, the battery system comprises a plurality of battery packs, each battery pack comprises a BMS, the BMS comprises a first BMS and at least one second BMS, and the charging control method comprises the steps that the first BMS establishes communication with a charging pile, and sends a charging mode to the second BMS, obtaining a first request current of the battery pack; the second BMS obtains a second request current of the battery pack according to the charging mode, and sends the second request current to the first BMS; the first BMS calculates target charging current according to the first request current and the second request current and sends a charging request to the charging pile, and the charging request carries the target charging current. According to the charging control method, the multiple battery packs of the battery system can be charged at the same time through one charging pile, the charging method can be suitable for charging the eVTOL manned aircraft with multiple sets of power batteries, the structure is simple, and the cost is low.

Description

Technical Field

[0001] This application relates to the field of charging technology for eVTOL (electric Vertical Take-off and Landing) aircraft, and particularly to a charging control method, device, storage medium, battery system, and aircraft. Background Technology

[0002] Lithium-ion batteries possess high energy density, voltage platform, and excellent cycle performance, leading to their widespread application in automotive power batteries. With technological innovation and the development of the information industry, automobiles and electric vehicles have become commonplace. However, the increasing number of cars on the road has ironically caused severe traffic congestion.

[0003] Therefore, many companies have begun developing eVTOL manned aircraft to alleviate traffic congestion and reduce environmental problems such as air pollution. However, the single battery pack and single battery management system commonly used in electric vehicles cannot meet the power requirements of aircraft, necessitating multiple power battery systems. This places higher demands on the charging control strategies for the power batteries.

[0004] Currently, the charging control methods for single battery packs and single battery management systems are not suitable for aircraft with multiple power batteries, and therefore urgently need to be improved. Summary of the Invention

[0005] This application provides a charging control method, device, storage medium, battery system, and electric vertical takeoff and landing (eVTOL) aircraft, which can realize information coordination among multiple BMSs of the battery system. Multiple battery packs of the battery system can be charged simultaneously through a single charging pile. It is applicable to charging eVTOL manned aircraft with multiple power batteries, and no additional hardware configuration is required. The structure is simple and the cost is low.

[0006] This application provides a charging control method for a battery system. The battery system includes multiple battery packs, each battery pack including a battery management system (BMS). The multiple BMSs include a first BMS and at least one second BMS. The charging control method includes: The first BMS establishes communication with the charging pile, sends the charging mode to the second BMS, and obtains the first request current of the battery pack. The second BMS obtains the second requested current of the battery pack according to the charging mode, and sends the second requested current to the first BMS; The first BMS calculates the target charging current based on the first requested current and the second requested current, and sends a charging request to the charging pile, the charging request carrying the target charging current.

[0007] In some embodiments, the battery system further includes a central management system, which is connected to the first BMS and the second BMS; The first BMS sends information to the second BMS through the central management system, and receives information sent by the second BMS through the central management system.

[0008] In some embodiments, before the first BMS establishes communication with the charging pile, the charging control method further includes: The central management system responds to the connection of the charging pile by sending a wake-up command to the first BMS; The first BMS is woken up according to the wake-up command and establishes communication with the charging pile.

[0009] In some embodiments, the first BMS calculates the target charging current based on the first requested current and the second requested current, including: Determine the minimum current from the first requested current and one or more of the second requested currents; The minimum current is multiplied by the number of battery packs to obtain the target charging current.

[0010] In some embodiments, before sending a charging request to the charging pile, the charging control method further includes: The first BMS calculates the target charging voltage; The charging request carries the target charging voltage.

[0011] In some embodiments, the first BMS calculates the target charging voltage according to the following formula: V = V1 * N + V0 Wherein, V is the target charging voltage, V1 is the charging cut-off voltage of the cells in the battery pack, N is the number of cells in the battery system, and V0 is the preset compensation voltage.

[0012] This application embodiment also provides a charging control device for a battery system, the battery system including multiple battery packs, each battery pack including a BMS, the multiple BMS including a first BMS and at least one second BMS, the charging control device including: The first control module is used to control the first BMS to establish communication with the charging pile, send the charging mode to the second BMS, and obtain the first request current of the battery pack to which the first BMS belongs. The second control module is used to control the second BMS to obtain the second requested current of the battery pack according to the charging mode. The charging request module is used to control the first BMS to calculate the target charging current based on the first requested current and the second requested current, and send a charging request to the charging pile, wherein the charging request carries the target charging current.

[0013] This application also provides a storage medium storing a computer program, which, when executed by a processor, implements the charging control method of any of the above embodiments.

[0014] This application also provides a battery system for implementing the charging control method of any of the above embodiments.

[0015] This application also provides an electric vertical takeoff and landing aircraft, including a battery system and a power motor. The battery system is used to supply power to the power motor and to implement the charging control method of any of the above embodiments.

[0016] In the charging control method of this application embodiment, the first BMS communicates with the charging pile and with each second BMS, which enables information coordination between multiple BMS. Multiple battery packs of the battery system can be charged simultaneously through one charging pile. It is applicable to charging eVTOL manned aircraft with multiple sets of power batteries, and no additional hardware configuration is required. The structure is simple and the cost is low. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the battery system according to an embodiment of this application.

[0019] Figure 2 This is a flowchart illustrating the charging control method according to an embodiment of this application.

[0020] Figure 3 This is a schematic diagram illustrating the internal structure of the battery system and its communication interaction with the charging pile, as described in an embodiment of this application.

[0021] Figure 4This is a schematic diagram illustrating the interaction between the first BMS, the central management system, and the second BMS in a battery system according to an embodiment of this application.

[0022] Figure 5 This is a schematic diagram of the charging control device according to an embodiment of this application. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] This application provides a charging control method for a battery system, used to charge the battery system. The battery system can be applied to an eVTOL aircraft.

[0025] refer to Figure 1 , Figure 1 This is a schematic diagram of the battery system according to an embodiment of this application. The battery system includes multiple battery packs, such as battery pack 1, battery pack 2, battery pack 3, ..., battery pack X. It is understood that eVTOL aircraft have higher safety requirements for their power systems than electric vehicles; therefore, a single battery pack approach is not suitable for eVTOL aircraft, and a multi-battery pack configuration is required to create safety redundancy in the power system.

[0026] Each battery pack includes a Battery Management System (BMS). For example, battery pack 1 includes BMS1, battery pack 2 includes BMS2, battery pack 3 includes BMS3, and battery pack X includes BMSX. These multiple BMSs include a first BMS and at least one second BMS. It should be noted that the first BMS does not specifically refer to a single BMS with additional functions; any of the multiple BMSs can serve as the first BMS, and the remaining BMSs are all second BMSs. For example, if BMS1 can serve as the first BMS, then BMS2 through BMSX are all second BMSs. As another example, if BMS2 can serve as the first BMS, then BMS1, BMS3 through BMSX are all second BMSs. In practical applications, the system determines which of the multiple BMSs serves as the first BMS based on the status of each BMS, and the remaining BMSs are all second BMSs.

[0027] refer to Figure 2 , Figure 2This is a schematic flowchart of a charging control method according to an embodiment of this application. The charging control method includes the following steps 110-130: 110. The first BMS establishes communication with the charging pile, sends the charging mode to the second BMS, and obtains the first request current of the battery pack. 120. The second BMS obtains the second requested current of its battery pack according to the charging mode and sends the second requested current to the first BMS. 130. The first BMS calculates the target charging current based on the first requested current and the second requested current, and sends a charging request to the charging pile, the charging request carrying the target charging current.

[0028] The charging pile is used to charge each battery pack in the battery system. In step 110, during the charging connection process, the first BMS first establishes communication with the charging pile. The first BMS is responsible for exchanging information such as charging current, charging voltage, and control commands with the charging pile. After establishing communication, the first BMS obtains the charging mode of the charging pile through information exchange. In practical applications, the charging mode may include, for example, fast charging mode, equalization charging mode, and slow charging mode (maintenance mode).

[0029] Subsequently, the first BMS sends the charging mode of the charging pile to the second BMS and obtains the first requested current of the battery pack to which the first BMS belongs. It should be noted that when sending the charging mode to the second BMS, the first BMS sends the charging mode of the charging pile to each of the second BMSs. When obtaining the first requested current of the battery pack to which the first BMS belongs, for example, if the first BMS is BMS1 as described above, then the first requested current of battery pack 1 is obtained; and if the first BMS is BMS3 as described above, then the first requested current of battery pack 3 is obtained, and so on.

[0030] In step 120, after receiving the charging mode from the first BMS, the second BMS obtains the second requested current of its battery pack and sends the second requested current to the first BMS. For example, if the first BMS is BMS1 and the second BMS includes BMS2 to BMSX, then BMS2 obtains the second requested current of battery pack 2 and sends it to BMS1, BMS3 obtains the second requested current of battery pack 3 and sends it to BMS1, and so on, until BMSX obtains the second requested current of battery pack X and sends it to BMS1.

[0031] In step 130, after receiving the second request currents sent by each of the second BMS, the first BMS calculates the target charging current based on the first and second request currents. For example, the target charging current can be obtained by accumulating the first request current and each of the second request currents. Subsequently, the first BMS sends a charging request to the charging pile, carrying the target charging current, so that the charging pile charges the battery system according to the target charging current, that is, charges each battery pack.

[0032] Therefore, in the charging control method of this application embodiment, communication between the first BMS and the charging pile, and communication between the first BMS and each of the second BMS, can realize information coordination between multiple BMS. Multiple battery packs of the battery system can be charged simultaneously through one charging pile. It can be applied to charging eVTOL manned aircraft with multiple sets of power batteries, and no additional hardware configuration is required. The structure is simple and the cost is low.

[0033] In some embodiments, reference Figure 3 , Figure 3 This is a schematic diagram illustrating the internal structure of the battery system and its communication interaction with the charging pile, as described in an embodiment of this application.

[0034] The battery system also includes a CMS (Central Management System). The CMS is connected to both the first BMS and the second BMS, for example, through a communication connection. Specifically, the first BMS sends information to the second BMS and receives information from the second BMS through the CMS. For example, the first BMS can be BMS1, and the second BMS can be BMSX (2 / 3 / 4). The CMS is communicatively connected to both BMS1 and BMSX (2 / 3 / 4). BMS1 sends information to BMSX (2 / 3 / 4) through the CMS, such as sending charging modes, and receives information from BMSX (2 / 3 / 4) through the CMS, such as receiving a second current request from BMSX (2 / 3 / 4).

[0035] In practical applications, the CMS can perform the following functions: issuing high-voltage commands; issuing high-voltage commands; identifying whether the aircraft level allows charging; transmitting the charging mode of the first BMS to the second BMS; and transmitting the second request current from the second BMS to the first BMS.

[0036] In practical applications, the first BMS (e.g., BMS1) can act as the central processing unit of the battery system, performing the following functions: coordinating the charging status and charging requests of the second BMS (e.g., BMS2, BMS3, ..., BMSX, etc.); detecting the connection status of the charging port; managing the charging control process at the charging pile end; performing self-tests and handling the charging requirements of the battery pack; responding to high-voltage commands, low-voltage commands, and charging permission commands from the CMS; and sending charging status and charging mode to the CMS. In practical applications, the first BMS (e.g., BMS1) can communicate with the charging pile via the charging CAN bus and connect to the charging pile via the A+ pin and the CC2 pull-down resistor. The charging pile can provide auxiliary power to the battery system via the A+ pin, and the CC2 pull-down resistor allows the charging pile to identify the battery system.

[0037] The second BMS (e.g., BMS2, BMS3, ..., BMSX, etc.) can perform the following functions: receive the charging mode transmitted by the CMS topology; respond to the high voltage command, low voltage command, and charging permission command from the CMS; and send the charging status and request current to the first BMS via the CMS topology.

[0038] In some embodiments, before the first BMS establishes communication with the charging pile, the charging control method further includes the following steps: The central management system responds to the connection of the charging pile by sending a wake-up command to the first BMS; The first BMS is activated by the wake-up command and establishes communication with the charging pile.

[0039] Understandably, when the battery system does not require charging, the first BMS can enter a sleep state to save power. When the charging pile is connected to the battery system, for example, when the CMS (Central Management System) detects the charging pile plug connection, the CMS responds to the connection by generating a wake-up command and sending it to the first BMS. Subsequently, the first BMS wakes up from its sleep state according to the wake-up command and establishes communication with the charging pile to achieve data interaction. In practical applications, the first BMS can enter a sleep state again after the battery system has finished charging.

[0040] In this embodiment of the application, when the charging pile is connected to the battery system, the first BMS is woken up by the CMS, so the first BMS can be put into sleep and woken up, which can save power consumption and ensure that the first BMS responds to charging needs in a timely manner.

[0041] In some embodiments, when the first BMS calculates the target charging current based on the first requested current and the second requested current, the following steps are included: Determine the minimum current from the first requested current and one or more second requested currents; Multiply the minimum current by the number of battery packs to obtain the target charging current.

[0042] In this process, after receiving the second request currents from each of the second BMS, the first BMS determines the minimum current from the first request current and one or more second request currents. The minimum current can be expressed by the following formula: I min (I) BMS1 I BMSX ), where I min I represents the minimum current. BMS1 I represents the first requested current of the battery pack to which the first BMS belongs. BMSX This indicates the second requested current for the battery pack to which the second BMS belongs.

[0043] Subsequently, the first BMS multiplies the minimum current by the number of battery packs to obtain the target charging current. The target charging current can be expressed by the following formula: I = I min *N, where I represents the target charging current and N represents the number of battery packs included in the battery system.

[0044] Understandably, in practical applications, the target charging current can be adjusted according to the actual condition of the battery system. For example, when the BMS (first BMS or second BMS) detects some minor faults that allow charging but require limiting the charging current, the target charging current can be further set according to the required limit.

[0045] In this embodiment, the first BMS calculates the target charging current based on the minimum current. The calculation method is simple and does not require complex analysis and data processing. Therefore, the target charging current can be obtained quickly, thereby improving the charging start-up speed.

[0046] In some embodiments, before sending a charging request to a charging station, the charging control method further includes the following step: the first BMS calculates the target charging voltage.

[0047] The first BMS can calculate the target charging voltage and then send a charging request to the charging pile carrying the target charging voltage, so that the charging pile can charge the battery system according to the target charging voltage, that is, charge each battery pack.

[0048] Understandably, the first BMS calculates the target charging voltage and sends it to the charging pile, enabling the charging pile to charge the battery system at the target charging voltage. This improves the compatibility between the charging pile's charging voltage and the battery system, avoiding the mismatch between the charging pile's charging voltage and the battery system's voltage requirements caused by charging the battery system solely with the charging pile's own output voltage, thereby improving the charging safety of the battery system.

[0049] In some embodiments, the first BMS calculates the target charging voltage according to the following formula: V = V1 * N + V0 Where V is the target charging voltage, V1 is the charging cut-off voltage of the cells in the battery pack, N is the number of cells in the battery system, and V0 is the preset compensation voltage.

[0050] In this context, a battery cell is a single charging unit within the battery system. The total number of battery cells in the battery system is N, where N is the sum of the number of cells in each battery pack (battery pack 1, battery pack 2, battery pack 3, ..., up to battery pack X). In practical applications, the cell specifications of each battery pack can be identical, and each cell has the same charging cutoff voltage V1. V0 is a preset compensation voltage; in one example, the preset compensation voltage V0 can be 10V.

[0051] Understandably, the first BMS can quickly calculate the required target charging voltage V based on the above formula and send the target charging voltage V to the charging pile, enabling the charging pile to start charging quickly.

[0052] In some embodiments, reference Figure 4 , Figure 4 This diagram illustrates the interaction between the first BMS, the central management system, and the second BMS in a battery system according to an embodiment of this application. Specifically, BMS1 is used as the first BMS, and BMSX (2 / 3 / 4) are used as the second BMS. The charging control method of this embodiment will be described in detail below.

[0053] The charging process of the battery system can be divided into three stages: charging wait, charging in progress, and charging complete.

[0054] Charging Waiting Phase: After the charging gun of the charging station is connected to the battery system, BMS1 wakes up, obtains the charging mode of the charging station, and sends the charging mode to CMS. CMS transmits the charging mode of BMS1 to BMSX. BMSX performs a self-test; if the self-test result indicates that charging is allowed, it sends the BMSX charging permission information to CMS. CMS transmits the BMSX charging permission information to BMS1. BMS1 performs a self-test; if the self-test result indicates that charging is allowed, it sends the BMS1 charging permission information to CMS. CMS self-tests whether charging is allowed at the aircraft level; if the self-test result indicates that charging is allowed, it sends the CMS charging permission information to BMS1 and BMSX. BMS1 interacts with the charging station to confirm whether charging is allowed. When the confirmation result indicates that charging is allowed, the charging waiting phase ends, and the charging in progress phase begins.

[0055] During the charging phase: BMSX acquires the requested charging current (i.e., the second requested current) and sends it to CMS. CMS then forwards the BMSX's requested charging current to BMS1. BMS1 acquires the requested charging current of its battery pack (i.e., the first requested current), calculates the overall charging current based on the BMSX's and BMS1's requested charging currents, and sends the overall charging current to the charging station, requesting the charging station to output it. During charging, both BMS1 and BMSX perform real-time self-checks to determine if the conditions for exiting charging are met. When BMSX's self-check meets the conditions for exiting charging, it sends an exit charging message to CMS. CMS then forwards the BMSX's exit charging message to BMS1. When BMS1's self-check meets the conditions for exiting charging, it exits charging and sends an exit charging message to CMS. Subsequently, CMS performs a self-check at the aircraft level to determine if the conditions for exiting charging are met at the aircraft level. When CMS's self-check meets the conditions for exiting charging, it exits charging and sends an exit charging message to BMS1 and BMSX. At this point, the charging phase has ended, and we are now entering the charging completion phase.

[0056] Charging Completion Stage: After CMS exits charging, it generates a CMS high-voltage command and sends it to BMS1 and BMSX. BMS1 disconnects the high-voltage circuit according to the CMS high-voltage command. BMSX disconnects the high-voltage circuit according to the CMS high-voltage command. Charging is now complete.

[0057] The charging control method of this application embodiment will be further described in detail below with a specific example. The charging control method includes the following steps: S1. The charging pile plug connection is detected, and the system enters the wake-up phase. The CMS issues a wake-up command to wake up the first BMS (BMS1 is used as an example below).

[0058] S2 and BMS1 successfully wake up and enter the charging waiting stage. The charging pile sends its configuration parameters to BMS1. BMS1 performs a self-test and receives and identifies the configuration parameters.

[0059] S3 and BMS1 pass self-tests, and the charging pile is recognized, entering the charging state. BMSX sends charging current requests for each battery pack to BMS1. BMS1 aggregates the charging needs of each battery pack and adjusts the requested charging current based on information such as the target charging current, requested charging current, and actual charging current (sampled). It calculates and uses closed-loop control to determine the requested current and voltage. Simultaneously, BMS1 receives charging feedback information and continuously performs self-tests during the charging process.

[0060] S4. If the charging current is lower than the threshold or the charging end timeout occurs, the charging end state will be entered, the charging relay will be disconnected, and the high voltage circuit will be disconnected.

[0061] S5 and BMS1 disconnect the charging pile power relay, enter the sleep stage, reduce the voltage, shut down ECAN transmission and reception, and store data before going into sleep mode.

[0062] In one example, step S3 includes the following sub-steps: S3.1 BMS1 performs self-checks for the following conditions. When all conditions are met, it will enter the charging state from the charging wait state: ① BMS1 allows charging; ② CMS allows charging; ③ High voltage is applied; ④ Charging gun connection is normal; ⑤ DC charging pile allows charging; ⑥ BMS1 communicates normally with the charging pile and CMS.

[0063] S3.2 BMSX performs self-checks for the following conditions. If all conditions are met, it enters the charging state: ①BMSX allows charging; ②CMS allows charging; ③High voltage is applied; ④Charging gun connection is normal.

[0064] S3.3 BMS1 self-test: If any of the following conditions are met, the charging wait state will be changed to the charging end state: ① BMS1 detects an abnormal situation (including non-fault abnormal situations such as abnormal charging gun connection or mismatch between the DC charging pile output voltage platform and the battery pack); ② BMS1 does not allow charging (a charging prohibition fault diagnosed according to the fault diagnosis specification); ③ The battery charging cutoff condition is reached (full charge or overvoltage non-full charge cutoff); ④ The charging pile actively stops charging; ⑤ Charging CAN message interaction is abnormal; ⑥ CMS initiates a stop charging command; ⑦ CMS communication loss is detected.

[0065] S3.4 BMSX self-test: If any of the following conditions are met, the charging wait state will be changed to the charging end state: ① BMS1 detects an abnormality (abnormal charging gun connection); ② BMS1 does not allow charging (a charging prohibition fault diagnosed according to the fault diagnosis specification); ③ The battery charging cutoff condition is reached (full charge or overvoltage non-full charge cutoff); ④ CMS initiates a stop charging command; ⑤ CMS communication loss is detected.

[0066] S3.5 During charging, BMS1 continuously performs self-tests. If the BMS1 self-test meets any of the conditions in S3.3, it will transition from charging in progress to the charging end state.

[0067] S3.6 During charging, BMSX continuously performs self-checks. If the BMSX self-check meets any of the conditions in S3.4, it will transition from charging in progress to the charging end state.

[0068] S3.7 When normal charging is complete, wait for the charging current to fall below the set value (e.g., 5A) or for the timeout to reach the set time (e.g., 10s) before disconnecting the charging relay. If the command to disconnect the charging relay is issued, there will be a delay (e.g., 100ms) before charging ends.

[0069] S3.8. During the charging process, if a high-level fault occurs (a high-level fault requires disconnection of the high-voltage circuit within 300ms), the charging process will directly end, and there will no longer be a requirement to delay for a period of time (e.g., 100ms) before the charging process ends.

[0070] S3.9 The allowable charging current of the battery pack is obtained by looking up the table (charging MAP table) and taking the smaller value based on the maximum / minimum cell voltage and the highest / lowest battery temperature, and then calculating it based on the battery SOH (State of Health) coefficient.

[0071] S3.10. If the BMS (BMS1 or BMSX) detects a minor fault (indicating a fault that allows charging but requires limiting the charging current), calculate the target charging current according to the following formula: I = k * I0. Where I represents the target charging current, k represents the current coefficient limiting charging due to the minor fault detected by the BMS, and I0 represents the allowable charging current of the battery system.

[0072] S3.11 and BMS1 have a closed-loop control function for requesting charging current from the charging pile. They can adjust the requested charging current based on information such as the target charging current and the actual charging current (obtained by sampling) to ensure that the battery system is always charged within the allowable charging current range.

[0073] S3.12. Calculate the target charging current using the following formula: I = I min (I) BMS1 I BMSX )*N. Where I represents the target charging current, I min I represents the minimum current. BMS1 I represents the first requested current of the battery pack to which the first BMS belongs. BMSX This indicates the second requested current of the battery pack to which the second BMS belongs, and N indicates the number of battery packs included in the battery system.

[0074] S3.13. Calculate the target charging voltage according to the following formula: V = V1 * N + V0. Where V is the target charging voltage, V1 is the charging cut-off voltage of a single cell, N is the number of cells in the battery system, and V0 is the preset compensation voltage, which can be, for example, 10V.

[0075] S3.14. For the charging cut-off voltage V1 of individual cells of different specifications, select the highest value.

[0076] S3.15 and BMS1 have a function to estimate the remaining charging time, and can provide real-time feedback (for example, by displaying the remaining charging time on the instrument panel of the whole machine).

[0077] S3.16 When calculating the remaining charging time, BMS1 needs to consider the charging output capacity of the charging pile. If the maximum output capacity of the charging pile is not within the effective range, the remaining time shall be calculated according to the maximum output capacity of the charging pile.

[0078] In one example, step S4 includes the following sub-steps: S4.1 The on / off control of the charging relay is handled by BMS1, and BMSX does not need to control the charging relay.

[0079] S4.2. BMS1 diagnoses charging relay sticking when any of the following conditions are met: ① If charging current is detected after the charging relay is disconnected while the charging gun is plugged in, it is determined that the charging relay is sticking; ② If charging current is detected after the charging gun is unplugged, it is determined that the charging relay is sticking.

[0080] S4.3 Before closing the charging relay, the charging port voltage needs to be checked. If the charging port voltage is less than the set value (e.g., 60V), the charging relay is closed; otherwise, the charging relay is not closed.

[0081] S4.4 When charging begins, the charging relay shall be closed after the main positive contactor of the system is closed; S4.5 After charging is complete, disconnect the charging relay and then disconnect the system's main positive contactor.

[0082] The charging control method of this application embodiment communicates with the charging pile through the first BMS (e.g., BMS1) and with each of the second BMS (e.g., BMSX) through the first BMS (e.g., BMS1). This enables information coordination between multiple BMSs, allowing multiple battery packs of the battery system to be charged simultaneously through a single charging pile. It is applicable to charging eVTOL manned aircraft with multiple sets of power batteries, and requires no additional hardware configuration. It has a simple structure and low cost.

[0083] This application also provides a charging control device for a battery system, used to control the charging of the battery system. The battery system can be applied to an eVTOL aircraft. The battery system includes multiple battery packs, for example... Figure 1The diagram shows battery packs 1, 2, 3, ..., X. Each battery pack includes a Battery Management System (BMS). For example, battery pack 1 includes BMS1, battery pack 2 includes BMS2, battery pack 3 includes BMS3, and battery pack X includes BMSX. Multiple BMSs include a first BMS and at least one second BMS. Each of the aforementioned multiple BMSs can serve as a first BMS, and the other BMSs are all second BMSs. For example, in one example, BMS1 can serve as the first BMS, and BMS2 through BMSX are all second BMSs.

[0084] refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of a charging control device according to an embodiment of this application. The charging control device includes a first control module 210, a second control module 220, and a charging request module 230.

[0085] The first control module 210 is used to control the first BMS to establish communication with the charging pile, send the charging mode to the second BMS, and obtain the first request current of the battery pack to which the first BMS belongs. The second control module 220 is used to control the second BMS to obtain the second requested current of the battery pack according to the charging mode. The charging request module 230 is used to control the first BMS to calculate the target charging current based on the first request current and the second request current, and send a charging request to the charging pile, the charging request carrying the target charging current.

[0086] In some embodiments, the first control module 210 is configured to: The central management system responds to the connection of the charging pile by sending a wake-up command to the first BMS; The first BMS is activated by the wake-up command and establishes communication with the charging pile.

[0087] In some embodiments, the charging request module 230 is configured to: Determine the minimum current from the first requested current and one or more second requested currents; Multiply the minimum current by the number of battery packs to obtain the target charging current.

[0088] In some embodiments, the charging request module 230 is further configured to: control the first BMS to calculate the target charging voltage before sending a charging request to the charging pile. The charging request carries the target charging voltage.

[0089] In some embodiments, when the charging request module 230 controls the first BMS to calculate the target charging voltage, it calculates it according to the following formula: V = V1 * N + V0 Where V is the target charging voltage, V1 is the charging cut-off voltage of the cells in the battery pack, N is the number of cells in the battery system, and V0 is the preset compensation voltage.

[0090] It should be noted that the specific implementation methods of the above modules can be found in the descriptions of the various embodiments of the charging control method, and will not be repeated here.

[0091] This application also provides a storage medium storing a computer program, which, when executed by a processor, implements the charging control method of any of the above embodiments.

[0092] This application also provides a battery system for implementing the charging control method of any of the above embodiments.

[0093] This application also provides an electric vertical takeoff and landing (eVTOL) aircraft. The eVTOL aircraft includes a battery system and a power motor. The battery system supplies power to the power motor, which drives the eVTOL aircraft to fly. The battery system is used to implement the charging control method of any of the above embodiments.

[0094] In the description of this application, it should be understood that terms such as “first” and “second” are used only to distinguish similar objects and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0095] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0096] The charging control method, apparatus, storage medium, battery system, and electric vertical takeoff and landing aircraft provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application, and the descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A charging control method for a battery system, characterized in that, The battery system includes multiple battery packs, each battery pack including a battery management system (BMS), and the multiple BMSs including a first BMS and at least one second BMS. The charging control method includes: The first BMS establishes communication with the charging pile, sends the charging mode to the second BMS, and obtains the first request current of the battery pack. The second BMS obtains the second requested current of the battery pack according to the charging mode, and sends the second requested current to the first BMS; The first BMS calculates the target charging current based on the first requested current and the second requested current, and sends a charging request to the charging pile, the charging request carrying the target charging current.

2. The charging control method according to claim 1, characterized in that, The battery system also includes a central management system, which is connected to the first BMS and the second BMS. The first BMS sends information to the second BMS through the central management system, and receives information sent by the second BMS through the central management system.

3. The charging control method according to claim 2, characterized in that, Before the first BMS establishes communication with the charging pile, the charging control method further includes: The central management system responds to the connection of the charging pile by sending a wake-up command to the first BMS; The first BMS is woken up according to the wake-up command and establishes communication with the charging pile.

4. The charging control method according to claim 1, characterized in that, The first BMS calculates the target charging current based on the first requested current and the second requested current, including: Determine the minimum current from the first requested current and one or more of the second requested currents; The minimum current is multiplied by the number of battery packs to obtain the target charging current.

5. The charging control method according to claim 1, characterized in that, Before sending a charging request to the charging pile, the charging control method further includes: The first BMS calculates the target charging voltage; The charging request carries the target charging voltage.

6. The charging control method according to claim 5, characterized in that, The first BMS calculates the target charging voltage according to the following formula: V = V1 * N + V0 Wherein, V is the target charging voltage, V1 is the charging cut-off voltage of the cells in the battery pack, N is the number of cells in the battery system, and V0 is the preset compensation voltage.

7. A charging control device for a battery system, characterized in that, The battery system includes multiple battery packs, each battery pack including a battery management system (BMS), the multiple BMS including a first BMS and at least one second BMS, and the charging control device including: The first control module is used to control the first BMS to establish communication with the charging pile, send the charging mode to the second BMS, and obtain the first request current of the battery pack to which the first BMS belongs. The second control module is used to control the second BMS to obtain the second requested current of the battery pack according to the charging mode. The charging request module is used to control the first BMS to calculate the target charging current based on the first requested current and the second requested current, and send a charging request to the charging pile, wherein the charging request carries the target charging current.

8. A storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the charging control method according to any one of claims 1 to 6.

9. A battery system, characterized in that, The battery system is used to implement the charging control method according to any one of claims 1 to 6.

10. An electric vertical takeoff and landing aircraft, characterized in that, It includes a battery system and a power motor, wherein the battery system is used to supply power to the power motor and to implement the charging control method according to any one of claims 1 to 6.

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