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

Abstract

The invention relates to a charging control method and device, a BMS, a storage medium and a computer program product, and relates to the technical field of battery management. The charging control method comprises the steps that charging parameters of a power battery are obtained, and the charging parameters comprise full-charge cut-off voltage and charging stage jump limiting voltage; under the condition that the real-time charging voltage of the power battery does not reach the full-charge cut-off voltage, the initial charging current is used for charging the power battery; under the condition that the real-time single maximum voltage of a battery cell in the power battery is larger than or equal to the charging stage jump limiting voltage and is kept for a first time, a prediction request charging current is determined, and when the prediction request charging current is applied to the power battery, the real-time single maximum voltage is smaller than the charging stage jump limiting voltage; and determining a target request charging current according to the predicted request charging current and the real-time SOH of the power battery.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery management, and particularly to a charging control method, a charging control device, a BMS (Battery Management System), a computer-readable storage medium, and a computer program product. Background Art

[0002] During the charging process of a power battery, it is necessary to reasonably control the charging current of the power battery to ensure the safety of the power battery during the charging process. Summary of the Invention

[0003] The inventors have found that: during the charging process of a power battery, it is necessary to determine the appropriate power reception capacity according to the SOC and temperature of the power battery. After determining the power reception capacity, the charging current of the power battery during the charging process shall not exceed this power reception capacity. If the charging current exceeds this power reception capacity during the charging process, it will accelerate the decline of the SOH (State of Health) of the power battery, reduce the capacity of the power battery to affect the endurance of the power battery, and also accelerate the precipitation of metal particles to affect the safety of the power battery during use. Therefore, how to adjust the charging current of the power battery in real time and accurately to ensure the safety of the power battery is a problem to be solved.

[0004] In view of this, the present disclosure provides a charging control method. According to some embodiments of the first aspect of the present disclosure, a charging control method is provided, including: obtaining charging parameters of a power battery, where the charging parameters include a full charge cut-off voltage and a charging stage jump limit voltage; when the real-time charging voltage of the power battery does not reach the full charge cut-off voltage, charging the power battery with an initial charging current; when the real-time maximum voltage of a single cell in the power battery is greater than or equal to the charging stage jump limit voltage and remains for a first period of time, determining a predicted requested charging current, where when the predicted requested charging current is applied to the power battery, the real-time maximum voltage of a single cell is less than the charging stage jump limit voltage; determining a target requested charging current according to the predicted requested charging current and the real-time battery health SOH of the power battery.

[0005] In some embodiments, determining the predicted requested charging current includes: determining a first charging stage of the power battery; determining a second charging stage according to the real-time state of charge SOC of the power battery; determining a target charging stage according to the sequence numbers of the first charging stage and the second charging stage; determining a predicted charging current according to the real-time temperature of the cells in the power battery and the target charging stage; when the real-time maximum voltage of a single cell is less than the charging stage jump limit voltage when the predicted charging current is applied to the power battery, determining the predicted charging current as the predicted requested charging current.

[0006] In some embodiments, determining the predicted requested charging current further includes: when the predicted charging current is applied to the power battery, if the highest single-cell voltage in real time is greater than or equal to the charging stage jump limit voltage, re-determining the predicted charging current.

[0007] In some embodiments, the real-time temperature of the battery cells in the power battery is the lowest real-time temperature among the real-time temperatures corresponding to multiple battery cells in the power battery.

[0008] In some embodiments, the charging parameters further include a first correspondence relationship, and the first correspondence relationship is used to indicate the requested charging current corresponding to the real-time temperature and the charging stage. According to the real-time temperature of the battery cells in the power battery and the target charging stage, determining the predicted charging current includes: determining the predicted charging current according to the real-time temperature of the battery cells in the power battery, the target charging stage, and the first correspondence relationship.

[0009] In some embodiments, the charging parameters further include a first correspondence relationship and a second correspondence relationship. The first correspondence relationship is used to indicate the requested charging current corresponding to the real-time temperature and the charging stage, and the second correspondence relationship is used to indicate the charging stage corresponding to the real-time SOC. Charging the power battery with the initial charging current includes: determining the charging stage of the power battery according to the real-time SOC of the power battery and the second correspondence relationship; determining the initial charging current according to the real-time temperature of the battery cells in the power battery, the charging stage of the power battery, and the first correspondence relationship; charging the power battery with the initial charging current.

[0010] In some embodiments, determining the target charging stage according to the sequence numbers of the first charging stage and the second charging stage includes: determining the charging stage with the larger sequence number among the first charging stage and the second charging stage as the target charging stage.

[0011] In some embodiments, determining the first charging stage of the power battery includes: when the sequence number of the charging stage where the power battery is located is less than the specified threshold, determining the next charging stage of the charging stage where the power battery is located as the first charging stage.

[0012] In some embodiments, determining the predicted requested charging current further includes: when the sequence number of the charging stage where the power battery is located is equal to the specified threshold, determining the predicted requested charging current according to the real-time temperature of the battery cells in the power battery and the charging stage where the power battery is located.

[0013] In some embodiments, the charging control method further includes: when the real-time charging voltage of the power battery reaches the full charge cut-off voltage and remains for a second time, determining that the target requested charging current is zero.

[0014] In some embodiments, the charging control method further includes: when the target requested charging current is greater than the charging current of the power battery at the current moment, controlling the charging current of the power battery to increase to the target requested charging current within a third time period.

[0015] According to some embodiments of the second aspect of the present disclosure, a charging control device is provided, including: an acquisition unit configured to acquire charging parameters of a power battery, where the charging parameters include a full charge cut-off voltage and a charging stage jump limit voltage; a first determination unit configured to charge the power battery with an initial charging current when the real-time charging voltage of the power battery does not reach the full charge cut-off voltage; a second determination unit configured to determine a predicted requested charging current when the real-time maximum cell voltage in the power battery is greater than or equal to the charging stage jump limit voltage and remains for a first time period, where when the predicted requested charging current is applied to the power battery, the real-time maximum cell voltage is less than the charging stage jump limit voltage; and a third determination unit configured to determine a target requested charging current according to the predicted requested charging current and the real-time state of health (SOH) of the power battery.

[0016] According to some embodiments of the third aspect of the present disclosure, a charging control device is provided, including: a memory and a processor coupled to the memory, where the processor is configured to execute the charging control method in any of the above embodiments based on instructions stored in the memory.

[0017] According to some embodiments of the fourth aspect of the present disclosure, a battery management system (BMS) is provided, including: the charging control device in any of the above embodiments; a power battery or a simulation device of the power battery configured to provide the real-time charging voltage, the real-time maximum cell voltage, and the real-time SOH of the power battery to the charging control device.

[0018] In some embodiments, when the BMS includes a power battery, the power battery is further configured to provide at least one of the real-time state of charge (SOC) and the real-time temperature of the power battery to the charging control device; when the BMS includes a simulation device of the power battery, the simulation device of the power battery is further configured to provide at least one of the real-time SOC and the real-time temperature of the power battery to the charging control device.

[0019] According to some embodiments of the fifth aspect of the present disclosure, a computer-readable storage medium is provided, on which computer instructions are stored, and when the instructions are executed by a processor, the charging control method in any of the above embodiments is implemented.

[0020] According to some embodiments of the sixth aspect of the present disclosure, a computer program product is provided, including computer instructions, and when the computer instructions are executed by a processor, the charging control method in any of the above embodiments is implemented.

[0021] In the above embodiments, it is determined whether the power battery is in a fully charged state by judging whether the real-time charging voltage of the power battery reaches the full-charge cut-off voltage. When the power battery needs to be charged, the power battery is first charged with the initial charging current, and then the magnitude relationship between the real-time maximum cell voltage of the power battery and the charging stage jump limit voltage is judged to determine whether the current charging current of the current power battery is reasonable. When the real-time maximum cell voltage of the power battery is greater than or equal to the charging stage jump limit voltage, it indicates that the current charging current is inappropriate, and then the predicted requested charging current is determined. Until the predicted requested charging current is applied to the power battery, the real-time maximum cell voltage is made less than the charging stage jump limit voltage. The predicted requested charging current is determined iteratively to determine the appropriate predicted requested charging current. The target requested charging current is determined through the predicted requested charging current and the real-time SOH, realizing the real-time and accurate adjustment of the charging current of the power battery. It can make the charging current of the power battery reasonable as soon as possible even when the SOC estimation of the power battery is inaccurate, so as to meet the requirement that the charging current of the power battery is less than the power receiving capacity of the power battery, ensuring the safety of the power battery and reducing the risks caused by the decrease of the SOH or the decrease of the endurance of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings forming a part of the specification depict embodiments of the present disclosure and, together with the specification, are used to explain the principles of the present disclosure.

[0023] With reference to the drawings, the present disclosure can be more clearly understood according to the following detailed description.

[0024] Figure 1 Schematic diagrams showing some embodiments of the charging control method of the present disclosure.

[0025] Figure 2 Schematic diagrams showing some embodiments of the first correspondence relationship of the present disclosure.

[0026] Figure 3 Schematic diagrams showing some embodiments of the second correspondence relationship of the present disclosure.

[0027] Figure 4 Schematic diagrams showing some embodiments of the correspondence relationship between the current difference and the current change rate of the present disclosure.

[0028] Figure 5 Schematic diagrams showing some embodiments of the charging control device of the present disclosure.

[0029] Figure 6 Schematic diagrams showing some other embodiments of the charging control device of the present disclosure.

[0030] Figure 7Schematic diagrams showing some embodiments of the BMS of the present disclosure. Detailed Description of Specific Embodiments

[0031] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0032] At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to actual proportional relationships.

[0033] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present disclosure, its application, or its use.

[0034] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and devices should be regarded as part of the specification.

[0035] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Accordingly, other examples of the exemplary embodiments may have different values.

[0036] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0037] During the charging process of a power battery, it is necessary to determine the charging stage of the power battery according to the SOC of the power battery. However, during the use of the power battery, the SOC may be estimated inaccurately. If the estimated value of the SOC of the power battery is smaller than the true data of the SOC, it will cause the charging current requested during the fast charging of the power battery to exceed the power receiving capacity of the power battery, resulting in damage to the power battery.

[0038] Regarding how to adjust the charging current of the power battery in real time and accurately to ensure the safety of the power battery and reduce the risk of harm caused by an excessive charging current due to a too large requested charging current, it is as follows.

[0039] Figure 1 Schematic diagrams showing some embodiments of the charging control method of the present disclosure.

[0040] As Figure 1 shown, the charging control method includes steps 110 to 140, and this charging control method is executed by a charging control device.

[0041] In step 110, charging parameters of the power battery are obtained. The charging parameters include a full charge cut-off voltage and a charging stage jump limit voltage. Among them, the full charge cut-off voltage refers to the cut-off voltage when the power battery is fully charged.

[0042] In step 120, when the real-time charging voltage of the power battery does not reach the full charge cut-off voltage, the power battery is charged using an initial charging current.

[0043] For example, the real-time charging voltage of the power battery can be collected in real time by the power battery or obtained from a simulation device of the power battery.

[0044] Regarding charging the power battery using the initial charging current, it includes steps (21) to (23). Among them, the charging parameters further include a first correspondence and a second correspondence. The first correspondence is used to indicate a requested charging current corresponding to the real-time temperature and the charging stage, and the second correspondence is used to indicate the charging stage corresponding to the real-time SOC. The real-time temperature can be collected in real time by the power battery or obtained from a simulation device of the power battery. Specifically as follows.

[0045] Regarding the first correspondence, Figure 2 A schematic diagram showing some embodiments of the first correspondence of the present disclosure.

[0046] As Figure 2 shown, when the charging stage is fixed, as the real-time temperature gradually increases, the charging current (or the requested current) shows a trend of increasing first and then decreasing; when the real-time temperature is fixed, as the sequence number of the charging stage gradually increases, the charging current (or the requested current) shows a trend of decreasing rapidly.

[0047] For example, the first correspondence can be a charging current table corresponding to different temperatures and different charging stages.

[0048] Regarding the second correspondence, Figure 3 A schematic diagram showing some embodiments of the second correspondence of the present disclosure.

[0049] As Figure 3 shown, as the SOC gradually increases, the sequence number of the charging stage shows a trend of gradually increasing.

[0050] In step (21), according to the real-time SOC of the power battery and the second correspondence, the charging stage where the power battery is located is determined.

[0051] In step (22), according to the real-time temperature of the battery cells in the power battery, the charging stage where the power battery is located, and the first correspondence, the initial charging current is determined.

[0052] In step (23), the power battery is charged using the initial charging current.

[0053] By determining the charging stage of the power battery according to the real-time SOC of the power battery, and then determining the initial charging current according to the real-time temperature of the battery cells in the power battery and the charging stage of the power battery, it helps to adjust the requested current of the power battery in real time subsequently.

[0054] In step 130, when the real-time maximum cell voltage in the power battery is greater than or equal to the charging stage jump limit voltage and remains for the first time, the predicted requested charging current is determined, where when the predicted requested charging current is applied to the power battery, the real-time maximum cell voltage is less than the charging stage jump limit voltage. Among them, the real-time maximum cell voltage in the power battery can be collected in real time by the power battery or obtained from the simulation device of the power battery. The real-time maximum cell voltage refers to the maximum voltage among the voltages corresponding to different battery cells in the power battery collected or obtained.

[0055] By adding the condition of the charging stage jump limit voltage during the charging process of the power battery, the problem that the SOC estimation of the power battery is inaccurate and it cannot jump to the appropriate charging stage in time is solved. By comparing the magnitude between the real-time maximum cell voltage in the power battery and the charging stage jump limit voltage, it is used to check whether the initial charging current is reasonable, reducing the risk caused by too large charging current and ensuring the safety of the power battery.

[0056] Regarding the determination of the predicted requested charging current, it specifically includes steps (31) to (35), where the charging process of the power battery is a multi-stage charging, and multiple charging stages are divided, specifically as follows.

[0057] In step (31), the first charging stage of the power battery is determined.

[0058] In some embodiments, when the sequence number of the charging stage where the power battery is located is less than the specified threshold, the next charging stage of the charging stage where the power battery is located is determined as the first charging stage.

[0059] In some embodiments, determining the predicted requested charging current further includes: when the sequence number of the charging stage where the power battery is located is equal to the specified threshold, determining the predicted requested charging current according to the real-time temperature of the battery cells in the power battery and the charging stage where the power battery is located.

[0060] For example, specify the threshold as the maximum value of the timing number of the charging stage (for example, if the charging process of the power battery is divided into 11 stages, then the specified threshold is 11). By determining whether the charging stage where the power battery is located is the last charging stage, if the charging stage where it is located is the last charging stage, then directly determine the predicted requested charging current based on the real-time temperature of the power battery and the charging stage where it is located, without performing subsequent judgments on the charging stage, simplifying the process of determining the target requested charging current and ensuring the feasibility of this charging control method.

[0061] In step (32), determine the second charging stage according to the real-time state of charge (SOC) of the power battery.

[0062] In step (33), determine the target charging stage according to the timing numbers of the first charging stage and the second charging stage.

[0063] In some embodiments, determine the charging stage with the larger timing number among the first charging stage and the second charging stage as the target charging stage.

[0064] The larger the timing number of the charging stage, the later the charging stage. The later the charging stage, the smaller the corresponding predicted charging current. By determining the charging stage with the larger timing number as the target charging stage, that is, requesting charging according to the smaller predicted charging current as much as possible, the stability of providing a reasonable charging current for the power battery is improved, that is, the stability of ensuring the safety of the power battery is improved.

[0065] In step (34), determine the predicted charging current according to the real-time temperature of the battery cells in the power battery and the target charging stage.

[0066] In some embodiments, the battery pack is composed of many battery cells connected in series, and the temperatures corresponding to different battery cells are different. The power receiving capacity of the battery cells with lower temperatures is worse. The real-time temperature of the battery cells in the power battery is the lowest real-time temperature among the real-time temperatures corresponding to multiple battery cells in the power battery.

[0067] The smaller the real-time temperature of the battery cells in the power battery, the smaller the corresponding predicted charging current. By determining the predicted charging current according to the lowest real-time temperature among the real-time temperatures corresponding to multiple battery cells in the power battery, that is, requesting charging according to the smaller predicted charging current as much as possible, the stability of providing a reasonable charging current for the power battery is improved, that is, the stability of ensuring the safety of the power battery is improved.

[0068] In some embodiments, the charging parameter further includes a first correspondence relationship, which is used to indicate the requested charging current corresponding to the real-time temperature and the charging stage. Regarding how to determine the predicted charging current according to the real-time temperature of the battery cells in the power battery and the target charging stage, the specific method is as follows: Determine the predicted charging current according to the real-time temperature of the battery cells in the power battery, the target charging stage, and the first correspondence relationship.

[0069] In step (35), when the predicted charging current is applied to the power battery and the real-time maximum single-cell voltage is less than the charging stage jump limit voltage, the predicted charging current is determined as the predicted requested charging current.

[0070] In some embodiments, determining the predicted requested charging current further includes: when the predicted charging current is applied to the power battery and the real-time maximum single-cell voltage is greater than or equal to the charging stage jump limit voltage, re-determine the predicted charging current.

[0071] Repeat the determination of the appropriate predicted charging current until, when the predicted charging current is applied to the power battery, the real-time maximum single-cell voltage is less than the charging stage jump limit voltage. By iteratively optimizing the determined predicted charging current, a predicted charging current that meets the requirements (i.e., when the predicted charging current is applied to the power battery, the real-time maximum single-cell voltage is less than the charging stage jump limit voltage) can be determined, which helps to determine the appropriate target requested charging current and ensures the safety of the power battery.

[0072] In step 140, determine the target requested charging current according to the predicted requested charging current and the real-time state of health (SOH) of the power battery.

[0073] During the process of determining the target requested charging current, the real-time SOH of the power battery is considered, and the actual situation of the power battery is combined when determining the target requested charging current, which improves the accuracy of the target requested charging current.

[0074] For example, to determine the target requested charging current according to the predicted requested charging current and the real-time state of health (SOH) of the power battery, it can be to calculate the product of the predicted requested charging current and the SOH of the power battery, and determine this product as the target requested charging current.

[0075] For example, when the SOH is 80% and the predicted requested charging current is 100A, the target requested charging current should not be 100A, but the product of 100A and 80%, that is, the target requested charging current is 80A.

[0076] In the above embodiments, by determining whether the real-time charging voltage of the power battery reaches the full charge cut-off voltage, it is judged whether the power battery is in a fully charged state. When the power battery needs to be charged, the power battery is first charged with the initial charging current, and then by judging the magnitude relationship between the real-time maximum cell voltage of the power battery and the charging stage jump limit voltage, it is determined whether the current charging current of the power battery is reasonable. When the real-time maximum cell voltage of the power battery is greater than or equal to the charging stage jump limit voltage, it indicates that the current charging current is inappropriate, and then the predicted requested charging current is determined. Until the predicted requested charging current is applied to the power battery, the real-time maximum cell voltage is less than the charging stage jump limit voltage. By iteratively determining the predicted requested charging current to determine the appropriate predicted requested charging current, and based on the predicted requested charging current and the real-time SOH, the target requested charging current is determined, which realizes the real-time and accurate adjustment of the charging current of the power battery. It can make the charging current of the power battery reasonable as soon as possible even when the SOC estimation of the power battery is inaccurate, so as to meet the requirement that the charging current of the power battery is less than the power receiving capacity of the power battery, ensuring the safety of the power battery and reducing the risks caused by the decrease of the SOH or the cruising range of the power battery.

[0077] In some embodiments, when the real-time charging voltage of the power battery reaches the full charge cut-off voltage and remains for a second time, the target requested charging current is determined to be zero.

[0078] By judging whether the real-time charging voltage of the power battery reaches the full charge cut-off voltage and lasts for a certain period of time to judge whether the power battery is fully charged, it is possible to cut off the power supply of the power battery in time when the power battery is fully charged, reducing the risk of damage caused by overcharging the battery.

[0079] In some embodiments, the charging control method further includes: smoothing the increased part of the target requested charging current compared with the charging current of the power battery at the current moment.

[0080] In some embodiments, when the target requested charging current is greater than the charging current of the power battery at the current moment, the charging current of the power battery is controlled to increase to the target requested charging current within a third time.

[0081] For example, the charging current of the power battery at the current moment is 100A, and the target requested charging current is 150A, that is, the charging current needs to increase to 150A. The increased 50A is required to be increased within 1s (i.e., the third time). The scheduling period is 10ms. Then it is necessary to increase 0.5A every 10ms. The starting time is 0, 0ms corresponds to 100A, 10ms corresponds to 100.05A, 20ms corresponds to 100.1A, and 1s corresponds to 150A.

[0082] By controlling the charging current of the power battery to increase to the target requested charging current within the third time, the risk caused by the impact on the single cells of the power battery and related high-voltage accessories in the power battery due to the sudden increase in the charging current is reduced, and the safety of the power battery is ensured.

[0083] Figure 4 Schematic diagrams showing some embodiments of the correspondence between the current difference and the current change rate of the present disclosure.

[0084] As Figure 4 shown, when the current difference is different, the current change rate is also different. As the current difference gradually increases, the current change rate shows a gradually increasing trend.

[0085] Figure 5 Schematic diagrams showing some embodiments of the charging control device of the present disclosure.

[0086] As Figure 5 shown, the charging control device 50 includes an acquisition unit 51, a first determination unit 52, a second determination unit 53, and a third determination unit 54.

[0087] The acquisition unit 51 is configured to acquire the charging parameters of the power battery, and the charging parameters include the full charge cut-off voltage and the charging stage jump limit voltage.

[0088] The first determination unit 52 is configured to charge the power battery with the initial charging current when the real-time charging voltage of the power battery does not reach the full charge cut-off voltage.

[0089] In some embodiments, the charging parameters further include a first correspondence and a second correspondence. The first correspondence is used to indicate the requested charging current corresponding to the real-time temperature and the charging stage, and the second correspondence is used to indicate the charging stage corresponding to the real-time SOC. The first determination unit 52 is further configured to determine the charging stage of the power battery according to the real-time SOC of the power battery and the second correspondence; determine the initial charging current according to the real-time temperature of the cells in the power battery, the charging stage of the power battery, and the first correspondence; and charge the power battery with the initial charging current.

[0090] In some embodiments, the first determination unit 52 is further configured to determine that the target requested charging current is zero when the real-time charging voltage of the power battery reaches the full charge cut-off voltage and remains for the second time.

[0091] A second determination unit 53, configured to determine a predicted requested charging current when the real-time maximum single-cell voltage of the battery cells in the power battery is greater than or equal to the charging stage jump limit voltage and remains for a first period of time, wherein when the predicted requested charging current is applied to the power battery, the real-time maximum single-cell voltage is less than the charging stage jump limit voltage.

[0092] In some embodiments, the second determination unit 53 is further configured to determine a first charging stage of the power battery; determine a second charging stage according to the real-time state of charge (SOC) of the power battery; determine a target charging stage according to the sequence numbers of the first charging stage and the second charging stage; determine a predicted charging current according to the real-time temperature of the battery cells in the power battery and the target charging stage; and when the predicted charging current is applied to the power battery and the real-time maximum single-cell voltage is less than the charging stage jump limit voltage, determine the predicted charging current as the predicted requested charging current.

[0093] In some embodiments, the real-time temperature of the battery cells in the power battery is the lowest real-time temperature among the real-time temperatures corresponding to multiple battery cells in the power battery.

[0094] In some embodiments, the charging parameter further includes a first correspondence relationship for indicating the requested charging current corresponding to the real-time temperature and the charging stage. The second determination unit 53 is further configured to determine the predicted charging current according to the real-time temperature of the battery cells in the power battery, the target charging stage, and the first correspondence relationship.

[0095] In some embodiments, the second determination unit 53 is further configured to re-determine the predicted charging current when the real-time maximum single-cell voltage is greater than or equal to the charging stage jump limit voltage when the predicted charging current is applied to the power battery.

[0096] In some embodiments, the second determination unit 53 is further configured to determine the charging stage with a larger sequence number in the first charging stage and the second charging stage as the target charging stage.

[0097] In some embodiments, the second determination unit 53 is further configured to, when the sequence number of the charging stage in which the power battery is located is less than a specified threshold, determine the next charging stage of the charging stage in which the power battery is located as the first charging stage.

[0098] In some embodiments, the second determination unit 53 is further configured to, when the sequence number of the charging stage in which the power battery is located is equal to the specified threshold, determine the predicted requested charging current according to the real-time temperature of the battery cells in the power battery and the charging stage in which the power battery is located.

[0099] A third determination unit 54, configured to determine a target requested charging current according to a predicted requested charging current and a real-time state of health (SOH) of the power battery.

[0100] In some embodiments, the charging control device 50 further includes a control unit, configured to control the charging current of the power battery to increase to the target requested charging current within a third time period when the target requested charging current is greater than the charging current of the power battery at the current moment.

[0101] In the above embodiments, by determining whether the real-time charging voltage of the power battery reaches the full charge cut-off voltage, it is determined whether the power battery is in a fully charged state. When the power battery needs to be charged, the power battery is first charged with an initial charging current, and then by determining the magnitude relationship between the real-time maximum cell voltage of the power battery and the charging stage jump limit voltage, it is determined whether the current charging current of the power battery is reasonable. When the real-time maximum cell voltage of the power battery is greater than or equal to the charging stage jump limit voltage, it indicates that the current charging current is inappropriate, and then the predicted requested charging current is determined until the predicted requested charging current is applied to the power battery, making the real-time maximum cell voltage less than the charging stage jump limit voltage. By iteratively determining the predicted requested charging current to determine a suitable predicted requested charging current, and by using the predicted requested charging current and the real-time SOH to determine the target requested charging current, it realizes real-time and accurate adjustment of the charging current of the power battery, and can make the charging current of the power battery reasonable as soon as possible even when the SOC estimation of the power battery is inaccurate, so as to meet the requirement that the charging current of the power battery is less than the power receiving capacity of the power battery, ensuring the safety of the power battery and reducing the risks caused by the decrease in the SOH or the decrease in the endurance of the power battery.

[0102] Figure 6 A schematic diagram showing other embodiments of the charging control device of the present disclosure.

[0103] As Figure 6 shown, the charging control device 50 of this embodiment includes: a memory 61 and a processor 62 coupled to the memory 61. The processor 62 is configured to execute the charging control method in any of the foregoing embodiments based on instructions stored in the memory 61.

[0104] The memory 61 may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory stores, for example, an operating system, application programs, a boot loader, and other programs.

[0105] The charging control device 50 may further include an input / output interface 63, a network interface 64, a storage interface 65, etc. These interfaces 63, 64, 65, the memory 61, and the processor 62 may be connected, for example, through a bus 66. Among them, the input / output interface 63 provides connection interfaces for input / output devices such as a display, a mouse, a keyboard, a touch screen, a microphone, and a speaker. The network interface 64 provides connection interfaces for various networking devices. The storage interface 65 provides connection interfaces for external storage devices such as an SD card and a USB flash drive.

[0106] In the above embodiment, by determining whether the real-time charging voltage of the power battery reaches the full charge cut-off voltage, it is determined whether the power battery is in a fully charged state. When the power battery needs to be charged, the power battery is first charged with an initial charging current, and then by judging the magnitude relationship between the real-time maximum single-cell voltage of the power battery and the charging stage jump limit voltage, it is determined whether the current charging current of the power battery is reasonable. When the real-time maximum single-cell voltage of the power battery is greater than or equal to the charging stage jump limit voltage, it indicates that the current charging current is inappropriate, and then the predicted requested charging current is determined. Until the predicted requested charging current is applied to the power battery, the real-time maximum single-cell voltage is less than the charging stage jump limit voltage. By iteratively determining the predicted requested charging current to determine a suitable predicted requested charging current, and by the predicted requested charging current and the real-time SOH, the target requested charging current is determined, realizing real-time and accurate adjustment of the charging current of the power battery, and enabling the charging current of the power battery to be reasonable as soon as possible even when the SOC estimation of the power battery is inaccurate, so as to satisfy that the charging current of the power battery is less than the power receiving capacity of the power battery, ensuring the safety of the power battery and reducing the risks caused by the decrease of the SOH or the cruising range of the power battery.

[0107] Figure 7 A schematic diagram showing some embodiments of the BMS (Battery Management System) of the present disclosure.

[0108] As Figure 7 shown, the BMS 70 includes the charging control device 50 in any of the above embodiments and a power battery or a simulation device 71 of the power battery.

[0109] The power battery or the simulation device 71 of the power battery is configured to provide the real-time charging voltage, the real-time maximum single-cell voltage, and the real-time SOH of the power battery to the charging control device 50.

[0110] In some embodiments, when the BMS 70 includes the power battery in the simulation device 71 of the power battery, the power battery is further configured to provide at least one of the real-time SOC and the real-time temperature of the power battery to the charging control device 50.

[0111] In some embodiments, when the BMS 70 includes a simulation device of a power battery in the power battery or the simulation device 71 of the power battery, the simulation device of the power battery is further configured to provide at least one of the real-time SOC and the real-time temperature of the power battery to the charging control device 50.

[0112] In the above embodiments, by determining whether the real-time charging voltage of the power battery reaches the full charge cut-off voltage, it is determined whether the power battery is in a fully charged state. When the power battery needs to be charged, the power battery is first charged with the initial charging current, and then by judging the magnitude between the real-time maximum voltage of the single cell of the power battery and the charging stage jump limit voltage, it is determined whether the charging current of the current power battery is reasonable. When the real-time maximum voltage of the single cell of the power battery is greater than or equal to the charging stage jump limit voltage, it indicates that the charging current at the current moment is inappropriate, and then the predicted requested charging current is determined until the predicted requested charging current is applied to the power battery, so that the real-time maximum voltage of the single cell is less than the charging stage jump limit voltage. By iteratively determining the predicted requested charging current to determine the appropriate predicted requested charging current, and by the predicted requested charging current and the real-time SOH, the target requested charging current is determined, realizing the real-time and accurate adjustment of the charging current of the power battery, and enabling the charging current of the power battery to be reasonable as soon as possible even when the SOC estimation of the power battery is inaccurate, so as to satisfy that the charging current of the power battery is less than the power receiving capacity of the power battery, ensuring the safety of the power battery and reducing the risks caused by the decrease of the SOH or the decrease of the endurance of the power battery.

[0113] In some embodiments, a computer program product is protected, including a computer program or instruction, which implements the above charging control method when executed by a processor. The computer program product includes a computer program carried on a computer-readable medium, and the computer program includes program codes for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network by the charging control device, or installed from a storage device, or installed from a ROM. When the computer program is executed by the CPU, the above functions defined in the method of the embodiments of the present disclosure are executed.

[0114] Those skilled in the art should understand that the embodiments of the present disclosure can be provided as a method, a system, or a computer program product. Therefore, the present disclosure can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present disclosure can take the form of a computer program product implemented on one or more computer-usable non-transitory storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0115] So far, the charging control method, device, BMS, storage medium and computer program product of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details well known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0116] The methods and systems of the present disclosure may be implemented in many ways. For example, the methods and systems of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of steps for the methods is for illustration only, and the steps of the methods of the present disclosure are not limited to the specific order described above, unless otherwise specifically stated. In addition, in some embodiments, the present disclosure may also be implemented as a program recorded in a recording medium, and these programs include machine-readable instructions for implementing the methods according to the present disclosure. Therefore, the present disclosure also covers a recording medium storing a program for executing the methods according to the present disclosure.

[0117] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustration only and not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments may be modified without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A charging control method, comprising: Obtaining charging parameters of the power battery, wherein the charging parameters include a full-charge cut-off voltage and a charging stage jump limit voltage; When the real-time charging voltage of the power battery does not reach the full-charge cut-off voltage, charging the power battery with an initial charging current; When the real-time single cell maximum voltage of the battery cell in the power battery is greater than or equal to the charging stage jump limit voltage and is maintained for a first time, determining a predicted requested charging current, wherein when the predicted requested charging current is applied to the power battery, the real-time single cell maximum voltage is less than the charging stage jump limit voltage; A target requested charging current is determined according to the predicted requested charging current and the real-time state of health (SOH) of the power battery.

2. The charging control method according to claim 1, wherein: The determining of the predicted requested charging current comprises: Determining a first charging stage of the power battery; Determining a second charging stage according to the real-time battery state of charge SOC of the power battery; Determining a target charging stage according to the timing numbers of the first charging stage and the second charging stage; Determining a predicted charging current according to the real-time temperature of the battery cell in the power battery and the target charging stage; When the predicted charging current is applied to the power battery and the real-time single cell maximum voltage is less than the charging stage jump limit voltage, the predicted charging current is determined as the predicted requested charging current.

3. The charging control method according to claim 2, wherein: The determining the predicted requested charging current further includes: When the predicted charging current is applied to the power battery, in a case where the real-time single cell maximum voltage is greater than or equal to the charging stage jump limit voltage, the predicted charging current is re-determined.

4. The charging control method according to claim 2, wherein: The real-time temperature of the battery cell in the power battery is the lowest real-time temperature among the real-time temperatures corresponding to the multiple battery cells in the power battery.

5. The charging control method according to claim 2, wherein: The charging parameter further includes a first corresponding relationship, wherein the first corresponding relationship is used to indicate a requested charging current corresponding to the real-time temperature and the charging stage. The determining the predicted charging current according to the real-time temperature of the battery cell in the power battery and the target charging stage comprises: The predicted charging current is determined according to the real-time temperature of the battery cell in the power battery, the target charging stage and the first corresponding relationship.

6. The charging control method according to claim 1, wherein: The charging parameters further include a first corresponding relationship and a second corresponding relationship, wherein the first corresponding relationship is used to indicate a requested charging current corresponding to the real-time temperature and the charging stage, and the second corresponding relationship is used to indicate a charging stage corresponding to the real-time SOC. The charging of the power battery using the initial charging current comprises: Determining the charging stage of the power battery according to the real-time SOC of the power battery and the second corresponding relationship; determining the initial charging current according to the real-time temperature of the battery cell in the power battery, the charging stage of the power battery and the first corresponding relationship; The power battery is charged using the initial charging current.

7. The charging control method according to any one of claims 2 to 5, wherein: The step of determining the target charging stage according to the timing numbers of the first charging stage and the second charging stage comprises: The charging stage with a larger timing sequence number between the first charging stage and the second charging stage is determined as the target charging stage.

8. The charging control method according to any one of claims 2 to 5, wherein: Determining the first charging stage of the power battery includes: When the timing number of the charging stage in which the power battery is located is less than a specified threshold, the next charging stage of the charging stage in which the power battery is located is determined as the first charging stage.

9. The charging control method according to any one of claims 2 to 5, wherein: The determining the predicted requested charging current further includes: When the timing number of the charging stage of the power battery is equal to the specified threshold, the predicted requested charging current is determined according to the real-time temperature of the battery cells in the power battery and the charging stage of the power battery.

10. The charging control method according to any one of claims 1 to 6, further comprising: When the real-time charging voltage of the power battery reaches the full-charge cut-off voltage and is maintained for a second time, the target requested charging current is determined to be zero.

11. The charging control method according to any one of claims 1 to 6, further comprising: When the target requested charging current is greater than the current charging current of the power battery, the charging current of the power battery is controlled to increase to the target requested charging current within a third time.

12. A charging control device, comprising: An acquisition unit is configured to acquire charging parameters of the power battery, wherein the charging parameters include a full-charge cut-off voltage and a charging stage jump limit voltage; a first determining unit, configured to charge the power battery using an initial charging current when the real-time charging voltage of the power battery does not reach the full-charge cut-off voltage; A second determining unit is configured to determine a predicted requested charging current when a real-time single cell maximum voltage of a cell in the power battery is greater than or equal to the charging stage jump limit voltage and is maintained for a first time, wherein when the predicted requested charging current is applied to the power battery, the real-time single cell maximum voltage is less than the charging stage jump limit voltage; The third determining unit is configured to determine a target requested charging current according to the predicted requested charging current and the real-time state of health SOH of the power battery.

13. A charging control device, comprising: Memory; and A processor coupled to the memory, the processor being configured to execute the charging control method according to any one of claims 1 to 11 based on instructions stored in the memory.

14. A battery management system BMS, comprising: The charging control device according to claim 12 or 13; The power battery or the simulation device of the power battery is configured to provide the charging control device with the real-time charging voltage, the real-time maximum voltage of the single cell and the real-time SOH of the power battery.

15. The BMS according to claim 14, wherein: In the case where the BMS includes the power battery, the power battery is further configured to provide at least one of a real-time SOC and a real-time temperature of the power battery to the charging control device; In the case where the BMS includes the simulation device of the power battery, the simulation device of the power battery is further configured to provide at least one of a real-time SOC and a real-time temperature of the power battery to the charging control device. 16 . A computer-readable storage medium having computer instructions stored thereon, wherein the instructions, when executed by a processor, implement the charging control method according to any one of claims 1 to 11. 17 . A computer program product, comprising computer instructions, wherein when the computer instructions are executed by a processor, the charging control method according to claim 1 is implemented.

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