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

Abstract

The present disclosure 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: obtaining a charging parameter of a power battery, the charging parameter comprising a full-charge cut-off voltage and a charging stage jump limit voltage; charging the power battery using an initial charging current when a real-time charging voltage of the power battery does not reach the full-charge cut-off voltage; determining a predicted request charging current when a real-time single highest voltage of a cell in the power battery is greater than or equal to the charging stage jump limit voltage and remains for a first time, wherein the real-time single highest voltage is less than the charging stage jump limit voltage when the predicted request charging current is applied to the power battery; and determining a target request charging current according to the predicted request charging current and a real-time state of health (SOH) of the power battery.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of battery management, and in particular, 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

[0002] In the process of charging, the charging current of the power battery needs to be reasonably controlled to ensure the safety of the power battery in the charging process. SUMMARY

[0003] The inventor finds that in the process of charging, the power battery needs to determine the appropriate power receiving capability according to the SOC and temperature of the power battery. After determining the power receiving capability, the charging current of the power battery in the charging process cannot exceed the power receiving capability. If the charging current exceeds the power receiving capability in the charging process, the decline of the SOH (State of Health) of the power battery will be accelerated, the capacity of the power battery will be reduced to affect the endurance of the power battery, and the metal particles will be precipitated to affect the safety of the power battery in use. Therefore, how to accurately adjust the charging current of the power battery in real time to ensure the safety of the power battery is a problem to be solved.

[0004] Therefore, 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, the charging parameters including a full-charge cutoff voltage and a charging phase jump limit voltage; charging the power battery with an initial charging current when a real-time charging voltage of the power battery does not reach the full-charge cutoff voltage; determining a predicted request charging current when a real-time single highest voltage of a cell in the power battery is greater than or equal to the charging phase jump limit voltage and remains for a first time, wherein the real-time single highest voltage is less than the charging phase jump limit voltage when the predicted request charging current is applied to the power battery; and determining a target request charging current according to the predicted request charging current and a real-time battery health degree SOH of the power battery.

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

[0006] In some embodiments, the determining the predicted request charging current further comprises: in a case that the real-time single highest voltage is greater than or equal to the charging phase jump limit voltage when the predicted charging current is applied to the power battery, re-determining the predicted charging current.

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

[0008] In some embodiments, the charging parameter further comprises a first correspondence relationship, the first correspondence relationship being used to indicate a request charging current corresponding to a real-time temperature and a charging phase, and the determining the predicted charging current comprises: determining the predicted charging current according to the real-time temperature of the cell in the power battery, the target charging phase, and the first correspondence relationship.

[0009] In some embodiments, the charging parameter further comprises a first correspondence relationship and a second correspondence relationship, the first correspondence relationship being used to indicate a request charging current corresponding to a real-time temperature and a charging phase, and the second correspondence relationship being used to indicate a charging phase corresponding to a real-time SOC, and the charging the power battery with the initial charging current comprises: determining a charging phase in which the power battery is located 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 cell in the power battery, the charging phase in which the power battery is located, and the first correspondence relationship; and charging the power battery with the initial charging current.

[0010] In some embodiments, the determining the target charging phase according to the time sequence numbers of the first charging phase and the second charging phase comprises: determining a charging phase with a larger time sequence number between the first charging phase and the second charging phase as the target charging phase.

[0011] In some embodiments, the determining the first charging phase of the power battery comprises: in a case that a time sequence number of the charging phase in which the power battery is located is less than a specified threshold, determining a next charging phase of the charging phase in which the power battery is located as the first charging phase.

[0012] In some embodiments, the determining the predicted request charging current further comprises: in a case that the time sequence number of the charging phase in which the power battery is located is equal to the specified threshold, determining the predicted request charging current according to the real-time temperature of the cell in the power battery and the charging phase in which the power battery is located.

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

[0014] In some embodiments, the charging control method further comprises: in a case where the target requested charging current is greater than the current charging current of the power battery, controlling the charging current of the power battery to increase to the target requested charging current within a third time.

[0015] According to some embodiments of the second aspect of the present disclosure, a charging control device is provided, comprising: an acquisition unit configured to acquire charging parameters of a power battery, the charging parameters comprising a full-charge cutoff voltage and a charging stage jump limit voltage; a first determination unit configured to charge the power battery with an initial charging current in a case where a real-time charging voltage of the power battery does not reach the full-charge cutoff voltage; a second determination unit configured to determine a predicted requested charging current in a case where a real-time single highest voltage of a cell in the power battery is greater than or equal to the charging stage jump limit voltage and remains for a first time, wherein the real-time single highest voltage is less than the charging stage jump limit voltage when the predicted requested charging current is applied to the power battery; and a third determination unit configured to determine a target requested charging current according to the predicted requested charging current and a 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, comprising: a memory and a processor coupled to the memory, the processor being 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, comprising: the charging control device in any of the above embodiments; and a power battery or an analog device of the power battery configured to provide the charging control device with a real-time charging voltage, a real-time single highest voltage, and a real-time SOH of the power battery.

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

[0019] According to some embodiments of the fifth aspect of the present disclosure, a computer-readable storage medium is provided, having computer instructions stored thereon, the instructions being executed by a processor to implement the charging control method in any of the above embodiments.

[0020] According to some embodiments of the sixth aspect of the present disclosure, a computer program product is provided, comprising computer instructions, the computer instructions being executed by a processor to implement the charging control method in any of the above embodiments.

[0021] In the above embodiment, by judging whether the real-time charging voltage of the power battery reaches the full charging cut-off voltage, it is judged whether the power battery is in a full state, when the power battery needs to be charged, the initial charging current is used to charge the power battery first, and then the size between the real-time single highest voltage of the power battery and the charging stage jump limit voltage is judged to determine whether the current charging current of the power battery is reasonable, when the real-time single highest 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 not suitable, then the predicted request charging current is determined, until the predicted request charging current is applied to the power battery, so that the real-time single highest voltage is less than the charging stage jump limit voltage. The predicted request charging current is determined by iteration to determine the suitable predicted request charging current, and the target request charging current is determined by the predicted request charging current and the real-time SOH, which realizes the 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 in the case that the SOC estimation of the power battery is not accurate, so as to meet the condition that the charging current of the power battery is less than the power receiving capacity of the power battery, and the safety of the power battery is ensured, and the risk caused by the decrease of SOH or the decrease of endurance of the power battery is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0023] Referring to the drawings and in accordance with the following detailed description, the present disclosure can be more clearly understood.

[0024] Figure 1 A schematic diagram showing some embodiments of the charging control method of the present disclosure.

[0025] Figure 2 A schematic diagram showing some embodiments of the first correspondence of the present disclosure.

[0026] Figure 3 A schematic diagram showing some embodiments of the second correspondence of the present disclosure.

[0027] Figure 4 A schematic diagram showing some embodiments of the correspondence between the current difference and the current change speed of the present disclosure.

[0028] Figure 5 A schematic diagram showing some embodiments of the charging control device of the present disclosure.

[0029] Figure 6 A schematic diagram showing some other embodiments of the charging control device of the present disclosure.

[0030] Figure 7A schematic diagram showing some embodiments of the BMS of the present disclosure. DETAILED DESCRIPTION

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

[0032] At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportion relationship for the convenience of description.

[0033] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application or uses.

[0034] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered part of the specification.

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

[0036] It should be noted that like numbers and letters refer to like items throughout the drawings, and once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0037] In the charging process of the power battery, the charging stage of the power battery needs to be determined according to the SOC of the power battery, but in the use process of the power battery, the SOC is estimated to be inaccurate. If the estimated value of the SOC of the power battery is smaller than the true data of the SOC, the requested charging current will exceed the power receiving capacity of the power battery during the fast charging process of the power battery, resulting in damage to the power battery.

[0038] For how to accurately adjust the charging current of the power battery in real time to ensure the safety of the power battery and reduce the risk of damage caused by the excessive charging current due to the excessive requested charging current, the following is specific.

[0039] Figure 1 A schematic diagram 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 the charging control method is performed by a charging control device.

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

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

[0043] For example, the real-time charging voltage of the power battery can be acquired in real time by the power battery or acquired from an analog device of the power battery.

[0044] For charging the power battery by using the initial charging current, steps (21) to (23) are included, wherein the charging parameters further include a first correspondence relationship and a second correspondence relationship, the first correspondence relationship is used to indicate a requested charging current corresponding to a real-time temperature and a charging stage, and the second correspondence relationship is used to indicate a charging stage corresponding to a real-time SOC. The real-time temperature can be acquired in real time by the power battery or acquired from an analog device of the power battery, and details are as follows.

[0045] For the first correspondence relationship, Figure 2 A schematic diagram showing some embodiments of the first correspondence relationship of the present disclosure is shown.

[0046] As shown in Figure 2 In a case where the charging stage is fixed, as the real-time temperature gradually increases, the charging current (or the requested current) presents a change trend of first increasing and then decreasing. In a case where the real-time temperature is fixed, as the time sequence number of the charging stage gradually increases, the charging current (or the requested current) presents a change trend of gradually decreasing.

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

[0048] For the second correspondence relationship, Figure 3 A schematic diagram showing some embodiments of the second correspondence relationship of the present disclosure is shown.

[0049] As shown in Figure 3 As the SOC gradually increases, the time sequence number of the charging stage presents a change trend of gradually increasing.

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

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

[0052] In step (23), the power battery is charged by 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 cell in the power battery and the charging stage of the power battery, the real-time adjustment of the subsequent requested current of the power battery is facilitated.

[0054] In step 130, in a case where the real-time single highest voltage of the battery cell in the power battery is greater than or equal to the charging stage jump limit voltage and remains for a first time, a predicted requested charging current is determined, wherein when the predicted requested charging current is applied to the power battery, the real-time single highest voltage is less than the charging stage jump limit voltage. The real-time single highest voltage of the battery cell in the power battery can be collected in real time from the power battery or obtained from an analog device of the power battery. The real-time single highest 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 in the charging process of the power battery, the problem that the power battery SOC estimation is inaccurate and cannot jump to the appropriate charging stage in time is solved. By comparing the size between the real-time single highest voltage of the battery cell in the power battery and the charging stage jump limit voltage, it is checked whether the initial charging current is reasonable, the risk caused by the excessive charging current is reduced, and the safety of the power battery is ensured.

[0056] For determining the predicted requested charging current, steps (31) to (35) are specifically included, wherein the charging process of the power battery is multi-stage charging, and a plurality of charging stages are divided, as follows.

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

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

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

[0060] For example, the threshold is set as the maximum value of the time sequence number of the charging stage (for example, if the charging process of the power battery is divided into 11 stages, the threshold is set as 11), by judging whether the charging stage of the power battery is the last charging stage, if the charging stage is the last charging stage, the predicted request charging current is directly determined according to the real-time temperature of the power battery and the charging stage, and the subsequent judgment of the charging stage is no longer performed, thereby simplifying the determination process of the target request charging current and guaranteeing the feasibility of the charging control method.

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

[0062] In step (33), the target charging stage is determined according to the time sequence numbers of the first charging stage and the second charging stage.

[0063] In some embodiments, the charging stage with a larger time sequence number in the first charging stage and the second charging stage is determined as the target charging stage.

[0064] The larger the time sequence number of the charging stage is, the later the charging stage is, and the smaller the corresponding predicted charging current is. By determining the charging stage with a larger time sequence number as the target charging stage, the charging is requested as much as possible according to the smaller predicted charging current, thereby improving the stability of providing a reasonable charging current for the power battery, i.e., improving the stability of guaranteeing the safety of the power battery.

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

[0066] In some embodiments, the battery pack is a plurality of cells connected in series, and the temperatures of different cells are different. The lower the temperature of the cell is, the worse the power receiving capability of the cell is. The real-time temperature of the cell in the power battery is the lowest real-time temperature among the real-time temperatures corresponding to the plurality of cells in the power battery.

[0067] The smaller the real-time temperature of the cell in the power battery is, the smaller the corresponding predicted charging current is. By determining the predicted charging current according to the lowest real-time temperature among the real-time temperatures corresponding to the plurality of cells in the power battery, the charging is requested as much as possible according to the smaller predicted charging current, thereby improving the stability of providing a reasonable charging current for the power battery, i.e., improving the stability of guaranteeing the safety of the power battery.

[0068] In some embodiments, the charging parameter further comprises a first correspondence relationship, the first correspondence relationship being used to indicate a requested charging current corresponding to the real-time temperature and the target charging stage, and the prediction charging current is determined according to the real-time temperature of the battery cell in the power battery and the target charging stage, specifically as follows: the prediction 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 correspondence relationship.

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

[0070] In some embodiments, the determination of the prediction requested charging current further comprises: in a case where the real-time single cell maximum voltage is greater than or equal to the charging stage jump limit voltage when the prediction charging current is applied to the power battery, the prediction charging current is re-determined.

[0071] The suitable prediction charging current is repeatedly determined until the real-time single cell maximum voltage is less than the charging stage jump limit voltage when the prediction charging current is applied to the power battery, and by iteratively optimizing the determined prediction charging current, the prediction charging current meeting the requirement (i.e., making the real-time single cell maximum voltage less than the charging stage jump limit voltage when the prediction charging current is applied to the power battery) can be determined, which helps to determine the suitable target requested charging current and guarantees the safety of the power battery.

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

[0073] In 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 in the determination of the target requested charging current, thereby improving the accuracy of the target requested charging current.

[0074] For example, the target requested charging current can be determined according to the prediction requested charging current and the real-time SOH of the power battery by calculating the product of the prediction requested charging current and the SOH of the power battery, and determining the product as the target requested charging current.

[0075] For example, in a case where the SOH is 80% and the prediction requested charging current is 100A, the target requested charging current should not be 100A, but the product of 100A and 80%, i.e., the target requested charging current is 80A.

[0076] In the above embodiment, by judging 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 full state. When the power battery needs to be charged, the power battery is first charged using the initial charging current, and then it is determined whether the current charging current of the power battery is reasonable by judging the size between the real-time single highest voltage of the power battery and the charging phase jump limit voltage. When the real-time single highest voltage of the power battery is greater than or equal to the charging phase jump limit voltage, it indicates that the current charging current is not suitable, and the predicted request charging current is determined until the real-time single highest voltage is less than the charging phase jump limit voltage when the predicted request charging current is applied to the power battery. The predicted request charging current is determined by iteration to determine the suitable predicted request charging current. The target request charging current is determined by the predicted request charging current and the real-time SOH, which realizes the 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 in the case that the SOC estimation of the power battery is not accurate, 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, and the safety of the power battery is ensured, and the risk caused by the decrease of SOH or the decrease of endurance of the power battery is reduced.

[0077] In some embodiments, in the case that the real-time charging voltage of the power battery reaches the full-charge cut-off voltage and remains for a second time, the target request 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 remains for a certain time, it is judged whether the power battery is fully charged, which can timely cut off the power supply to the power battery when the power battery is fully charged, and reduces the risk of damage caused by overcharging of the battery.

[0079] In some embodiments, the charging control method further comprises: smoothing the part of the target request charging current that is increased compared with the charging current of the power battery at the current time.

[0080] In some embodiments, in the case that the target request charging current is greater than the charging current of the power battery at the current time, the charging current of the power battery is controlled to increase to the target request charging current within a third time.

[0081] For example, the charging current of the power battery at the current time is 100A, and the target request charging current is 150A, i.e. the charging current needs to be increased to 150A, and the increased 50A needs to be completed within 1s (i.e. the third time). The scheduling period is 10ms, so 0.5A needs to be increased 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 battery cell of the power battery and the related high-voltage accessories in the power battery when the charging current suddenly increases is reduced, and the safety of the power battery is ensured.

[0083] Figure 4 A schematic diagram showing some embodiments of the correspondence between the current difference and the current change speed of the present disclosure.

[0084] As Figure 4 shown, the current change speed is different when the current difference is different, and as the current difference gradually increases, the current change speed presents a gradually increasing trend.

[0085] Figure 5 A schematic diagram 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 charging parameters of the power battery, the charging parameters including a full-charge cutoff voltage and a charging stage jump limit voltage.

[0088] The first determination unit 52 is 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 cutoff voltage.

[0089] In some embodiments, the charging parameters further include a first correspondence relationship and a second correspondence relationship, the first correspondence relationship being used to indicate the requested charging current corresponding to the real-time temperature and the charging stage, and the second correspondence relationship being 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 relationship; determine 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 correspondence relationship; 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 cutoff voltage and remains for a second time.

[0091] The second determining unit 53 is configured to determine a predicted request charging current in a case that the real-time cell highest voltage of the cells in the power battery is greater than or equal to the charging phase jump limit voltage and keeps the first time, wherein the real-time cell highest voltage is less than the charging phase jump limit voltage when the predicted request charging current is applied to the power battery.

[0092] In some embodiments, the second determining unit 53 is further configured to determine a first charging phase of the power battery, determine a second charging phase according to a real-time battery state of charge (SOC) of the power battery, determine a target charging phase according to a time sequence number of the first charging phase and the second charging phase, determine a predicted charging current according to a real-time temperature of the cells in the power battery and the target charging phase, and determine the predicted charging current as the predicted request charging current in a case that the real-time cell highest voltage is less than the charging phase jump limit voltage when the predicted charging current is applied to the power battery.

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

[0094] In some embodiments, the charging parameters further include a first correspondence relationship, the first correspondence relationship being used to indicate a request charging current corresponding to a real-time temperature and a charging phase, and the second determining unit 53 is further configured to determine the predicted charging current according to the real-time temperature of the cells in the power battery, the target charging phase, and the first correspondence relationship.

[0095] In some embodiments, the second determining unit 53 is further configured to re-determine the predicted charging current in a case that the real-time cell highest voltage is greater than or equal to the charging phase jump limit voltage when the predicted charging current is applied to the power battery.

[0096] In some embodiments, the second determining unit 53 is further configured to determine the target charging phase as a charging phase with a larger time sequence number between the first charging phase and the second charging phase.

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

[0098] In some embodiments, the second determining unit 53 is further configured to determine the predicted request charging current according to the real-time temperature of the cells in the power battery and the charging phase in which the power battery is located in a case that the time sequence number of the charging phase in which the power battery is located is equal to the specified threshold.

[0099] The third determining unit 54 is configured to determine the target requested charging current according to the predicted requested charging current and the real-time SOH of the power battery.

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

[0101] In the above embodiments, by judging 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 full state. When the power battery needs to be charged, the power battery is first charged by using the initial charging current, and then it is determined whether the current charging current of the power battery is reasonable by judging the size between the real-time highest cell voltage of the power battery and the charging phase jump limit voltage. When the real-time highest cell voltage of the power battery is greater than or equal to the charging phase jump limit voltage, it indicates that the current charging current is not appropriate, and then the predicted requested charging current is determined until the real-time highest cell voltage is less than the charging phase jump limit voltage when the predicted requested charging current is applied to the power battery. The predicted requested charging current is determined by iteration to determine the appropriate predicted requested charging current. The target requested charging current is determined by the predicted requested charging current and the real-time SOH, which realizes real-time and accurate adjustment of the charging current of the power battery. In the case that the SOC estimation of the power battery is not accurate, the charging current of the power battery can also be made reasonable as soon as possible to meet the condition that the charging current of the power battery is less than the power receiving capability of the power battery, thereby ensuring the safety of the power battery and reducing the risk caused by the decrease of the SOH or the endurance capability of the power battery.

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

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

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

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

[0106] In the above embodiment, by judging whether the real-time charging voltage of the power battery reaches the full charging cut-off voltage, it is judged whether the power battery is in the full state, when the power battery needs to be charged, the initial charging current is used to charge the power battery first, and then the size between the real-time single highest voltage of the power battery and the charging stage jump limit voltage is judged to determine whether the current charging current of the power battery is reasonable, when the real-time single highest voltage of the power battery is greater than or equal to the charging stage jump limit voltage, it means that the current charging current is not suitable, then the predicted request charging current is determined, until the predicted request charging current is applied to the power battery, so that the real-time single highest voltage is less than the charging stage jump limit voltage. The predicted request charging current is determined by iteration to determine the suitable predicted request charging current, and the target request charging current is determined by the predicted request charging current and the real-time SOH, which realizes the 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 in the case of inaccurate SOC estimation of the power battery, 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, and the safety of the power battery is ensured, and the risk caused by the decrease of SOH or the decrease of endurance of the power battery is reduced.

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

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

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

[0110] In some embodiments, in the case where the BMS 70 comprises the power battery in the power battery simulation device 71, 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 apparatus 50.

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

[0112] In the above-mentioned embodiments, by judging 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 full state, when the power battery needs to be charged, the initial charging current is first used to charge the power battery, and then the size between the real-time single highest voltage of the power battery and the charging phase jump limit voltage is judged to determine whether the current charging current of the power battery is reasonable, when the real-time single highest voltage of the power battery is greater than or equal to the charging phase jump limit voltage, it indicates that the charging current at the current time is not suitable, then the predicted request charging current is determined, until the predicted request charging current is applied to the power battery, so that the real-time single highest voltage is less than the charging phase jump limit voltage. The predicted request charging current is determined by iteration to determine the suitable predicted request charging current, and the target request charging current is determined by the predicted request charging current and the real-time SOH, which realizes the 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 in the case where the SOC estimation of the power battery is not accurate, 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, and the safety of the power battery is guaranteed, and the risk caused by the decrease of SOH or the decrease of endurance of the power battery is reduced.

[0113] In some embodiments, a computer program product is protected, which includes a computer program or instructions, which, when executed by a processor, implements the above-mentioned charging control method. The computer program product includes a computer program carried on a computer readable medium, which includes program codes for executing the method shown in the flow chart. In such embodiments, the computer program can be downloaded and installed from a 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-mentioned 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 an entirely hardware embodiment, an entirely 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-ROMs, 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. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.

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

[0117] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can 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 a charging parameter of a power battery, the charging parameter comprising a full-charge cut-off voltage and a charging stage jump limit voltage; charging the power battery with an initial charging current in a case where a real-time charging voltage of the power battery does not reach the full-charge cut-off voltage; in a case where a real-time single highest voltage of a cell in the power battery is greater than or equal to the charging stage jump limit voltage and remains for a first time, determining a predicted request charging current, comprising: determining a first charging stage of the power battery; determining a second charging stage according to a real-time battery state of charge of the power battery; determining a target charging stage according to a time sequence number of the first charging stage and the second charging stage; determining a predicted charging current according to a real-time temperature of the cell in the power battery and the target charging stage; in a case where the real-time single highest voltage is less than the charging stage jump limit voltage when the predicted request charging current is applied to the power battery, determining the predicted request charging current as the predicted charging current, wherein the real-time single highest voltage is less than the charging stage jump limit voltage when the predicted request charging current is applied to the power battery; determining a target request charging current according to the predicted request charging current and a real-time battery health of the power battery.

2. The charge control method according to claim 1, wherein, The determining of the predicted request charging current further comprises: in a case where the real-time single highest voltage is greater than or equal to the charging stage jump limit voltage when the predicted charging current is applied to the power battery, re-determining the predicted charging current.

3. The charge control method according to claim 1, wherein, The real-time temperature of the cell in the power battery is a lowest real-time temperature among real-time temperatures of a plurality of cells in the power battery.

4. The charge control method according to claim 1, wherein, The charging parameter further comprises a first correspondence relationship, the first correspondence relationship being used to indicate a request charging current corresponding to a real-time temperature and a charging stage, The determining of the predicted charging current according to the real-time temperature of the cell in the power battery and the target charging stage comprises: determining the predicted charging current according to the real-time temperature of the cell in the power battery, the target charging stage and the first correspondence relationship.

5. The charge control method according to claim 1, wherein, The charging parameter further comprises a first correspondence relationship and a second correspondence relationship, the first correspondence relationship being used to indicate a request charging current corresponding to a real-time temperature and a charging stage, and the second correspondence relationship being used to indicate a charging stage corresponding to a real-time battery state of charge, The charging of the power battery with the initial charging current comprises: determining a charging stage in which the power battery is located according to a real-time battery state of charge of the power battery and the second correspondence relationship; determining the initial charging current according to a real-time temperature of the cell in the power battery, the charging stage in which the power battery is located and the first correspondence relationship; charging the power battery with the initial charging current.

6. The charging control method according to any one of claims 1 to 4, wherein, The determining of the target charging stage according to the time sequence number of the first charging stage and the second charging stage comprises: determining the target charging phase as the charging phase with a larger time sequence number between the first charging phase and the second charging phase.

7. The charging control method according to any one of claims 1 to 4, wherein, The determining the first charging phase of the power battery comprises: In a case where the time sequence number of the charging phase in which the power battery is located is less than a specified threshold, determining a next charging phase of the charging phase in which the power battery is located as the first charging phase.

8. The charging control method according to any one of claims 1 to 4, wherein, The determining the predicted request charging current further comprises: In a case where the time sequence number of the charging phase in which the power battery is located is equal to the specified threshold, determining the predicted request charging current according to the real-time temperature of the cell in the power battery and the charging phase in which the power battery is located.

9. The charging control method according to any one of claims 1 to 5, further comprising: In a case where the real-time charging voltage of the power battery reaches the full-charge cut-off voltage and remains for a second time, determining the target request charging current as zero.

10. The charging control method of any one of claims 1 to 5, further comprising: In a case where the target request charging current is greater than the charging current of the power battery at a current time, controlling the charging current of the power battery to increase to the target request charging current within a third time.

11. A charging control apparatus, comprising: an acquisition unit configured to acquire charging parameters of a power battery, the charging parameters comprising a full-charge cut-off voltage and a charging phase jump limit voltage; a first determination unit configured to charge the power battery with an initial charging current in a case where a 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 request charging current in a case where a real-time single highest voltage of a cell in the power battery is greater than or equal to the charging phase jump limit voltage and remains for a first time, comprising: determining a first charging phase of the power battery; determining a second charging phase according to a real-time battery state of charge of the power battery; determining a target charging phase according to time sequence numbers of the first charging phase and the second charging phase; determining a predicted charging current according to a real-time temperature of the cell in the power battery and the target charging phase; and determining the predicted request charging current as the predicted charging current in a case where the real-time single highest voltage is less than the charging phase jump limit voltage when the predicted charging current is applied to the power battery, wherein the real-time single highest voltage is less than the charging phase jump limit voltage when the predicted request charging current is applied to the power battery; a third determination unit configured to determine a target request charging current according to the predicted request charging current and a real-time battery health of the power battery.

12. A charging control apparatus, comprising: a memory; and a processor coupled to the memory, the processor configured to execute the charging control method of any one of claims 1 to 10 based on instructions stored in the memory.

13. A battery management system, comprising: the charging control apparatus of claim 11 or 12; The power battery or the simulation device of the power battery is configured to provide the real-time charging voltage, the real-time single highest voltage and the real-time battery health degree of the power battery to the charging control device. 14.The battery management system of claim 13, wherein, In a case where the battery management system comprises the power battery, the power battery is further configured to provide at least one of the real-time battery state of charge and the real-time temperature of the power battery to the charging control device; In a case where the battery management system comprises the 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 battery state of charge and the real-time temperature of the power battery to the charging control device. 15.A computer readable storage medium having stored thereon computer instructions, which when executed by a processor, implement the charging control method of any one of claims 1 to 10. 16.A computer program product comprising computer instructions, which when executed by a processor, implement the charging control method of any one of claims 1 to 10.

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