Battery charging current control method and device

Abstract

The invention provides a battery charging current control method and device, and the method comprises the steps: determining the required current of a target battery in an initial charging stage based on the temperature and charge state of the target battery; increasing the request current of the target battery in the initial charging stage to the required current of the initial charging stage according to the first current step length; in the increasing process, current response parameters of the target charging pile are determined based on the output current of the target charging pile; determining a second current step length of the target battery based on the stage current difference and the current response parameter of the target battery; the request current corresponding to the subsequent charging stage is increased according to the second current step length; and when the voltage of the target battery reaches the cut-off voltage, controlling the target charging pile to stop charging the target battery. By adopting the technical scheme provided by the invention, the optimal control of the battery charging current is realized, the charging time is shortened, the overcharge risk is effectively reduced, and the health degree of the battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery charging current control, and in particular to a method and device for controlling battery charging current. Background Art

[0002] With the increasing popularity of new energy vehicles, ensuring users experience optimal battery charging performance has become a key industry concern. In this process, battery charge current control is a key technology in battery charge management. Accurate charge current control not only extends battery life but also improves battery safety and reliability.

[0003] However, in actual applications, the response characteristics of different charging piles and the diverse charging needs of users will affect the performance of battery charging current control. Summary of the Invention

[0004] In view of this, the embodiments of the present application provide a method and device for controlling battery charging current to achieve optimized control of battery charging current, thereby shortening charging time, effectively reducing the risk of overcharging and improving battery health.

[0005] This application mainly includes the following aspects: In a first aspect, an embodiment of the present application provides a method for controlling a battery charging current, the method comprising: (A) determining a required current of a target battery in an initial charging stage based on a temperature and a state of charge of a target battery; (B) increasing a requested current of the target battery in the initial charging stage to a required current of the initial charging stage according to a first current step, so that an output current of a target charging pile reaches a required current interval corresponding to the initial charging stage; (C) during the increase, determining a current response parameter of the target charging pile based on the output current of the target charging pile; (D) determining that the target battery enters a next charging stage of the initial charging stage when the output current of the target charging pile reaches the required current interval corresponding to the initial charging stage and the voltage of the target battery does not reach a cut-off voltage; (E) determining a required current of the target battery in the next charging stage based on the temperature and the state of charge of the target battery; and (F) determining a current response parameter of the target charging pile based on a stage current difference of the target battery and a current difference of the target battery. The current response parameter is used to determine the second current step of the target battery; wherein the stage current difference is the difference between the demand current of the initial charging stage and the demand current of the next charging stage; (G) increasing the requested current of the target battery in the next charging stage to the demand current of the next charging stage according to the second current step, so that the output current of the target charging pile in the next charging stage reaches the demand current interval corresponding to the next charging stage; (H) when the output current of the target charging pile in the next charging stage reaches the demand current interval corresponding to the next charging stage and the voltage of the target battery has not reached the cut-off voltage, determining that the target battery enters the next charging stage of the next charging stage, re-obtaining the demand current of the next charging stage of the next charging stage, and returning to execution step (G); (I) when the voltage of the target battery reaches the cut-off voltage, controlling the target charging pile to stop charging the target battery.

[0006] Furthermore, the step (C) includes: during the increasing process, for each increasing moment of multiple increasing moments, the time from the increasing moment to the time when the output current of the target charging pile reaches the preset output current range corresponding to the increasing moment is determined as the target charging pile response time corresponding to the increasing moment; starting from the moment when the current increase instruction is issued, the time until the actual output current of the charging pile reaches the preset current range (such as ±5% error band) corresponding to the instruction is the charging pile response time of this current increasing operation; the quotient of the first current step and the target charging pile response time corresponding to the increasing moment is determined as the current response parameter corresponding to the increasing moment; and the average value of the current response parameters corresponding to all increasing moments is determined as the current response parameter of the target charging pile.

[0007] Furthermore, the step (E) includes: determining at least one candidate demand current of the target battery in the next charging stage based on the temperature and state of charge of the target battery; screening out the largest candidate demand current from all candidate currents in the next charging stage, and screening out the smallest candidate demand current from all candidate demand currents in the next charging stage; if the screened largest candidate demand current and the screened smallest candidate demand current are both greater than the demand current in the initial charging stage, reacquiring the temperature and state of charge of the target battery, and determining the demand current in the next charging stage based on the reacquired temperature and state of charge of the target battery; if the screened largest candidate demand current and the screened smallest candidate demand current are both not greater than the demand current in the initial charging stage, determining the demand current of the target battery in the next charging stage based on the preset charging mode of the target battery.

[0008] Furthermore, the preset charging mode includes a rapid charging mode; the preset charging mode based on the target battery determines the required current of the target battery in the next charging stage, including: when the preset charging mode of the target battery is the rapid charging mode, if the difference between the screened maximum candidate demand current and the screened minimum candidate demand current is less than the safety boundary compensation current corresponding to the rapid charging mode, then the screened maximum candidate demand current is determined as the required current of the target battery in the next charging stage; if the difference between the screened maximum candidate demand current and the screened minimum candidate demand current is not less than the safety boundary compensation current corresponding to the rapid charging mode, then the sum of the screened minimum candidate demand current and the safety boundary compensation current corresponding to the rapid charging mode is determined as the required current of the target battery in the next charging stage.

[0009] Furthermore, the preset charging mode includes a healthy charging mode; The method of determining the target battery's demand current in the next charging stage based on the preset charging mode of the target battery includes: when the preset charging mode of the target battery is a healthy charging mode, if the difference between the screened maximum candidate demand current and the screened minimum candidate demand current is less than the usage boundary compensation current corresponding to the healthy charging mode, then the screened maximum candidate demand current is determined as the target battery's demand current in the next charging stage; if the difference between the screened maximum candidate demand current and the screened minimum candidate demand current is not less than the usage boundary compensation current corresponding to the healthy charging mode, then the sum of the screened minimum candidate demand current and the usage boundary compensation current corresponding to the healthy charging mode is determined as the target battery's demand current in the next charging stage.

[0010] Furthermore, the preset charging mode includes a healthy charging mode; the preset charging mode based on the target battery determines the demand current of the target battery in the next charging stage, including: when the preset charging mode of the target battery is a balanced charging mode, determining the average value of all candidate demand currents in the next charging stage as the average candidate demand current of the next charging stage; if the difference between the average candidate demand current of the next charging stage and the screened minimum candidate demand current is less than the usage boundary compensation current corresponding to the balanced charging mode, then determining the average candidate demand current of the next charging stage as the demand current of the target battery in the next charging stage; if the difference between the average candidate demand current of the next charging stage and the screened minimum candidate demand current is not less than the usage boundary compensation current corresponding to the balanced charging mode, then determining the sum of the screened minimum candidate demand current and the usage boundary compensation current corresponding to the balanced charging mode as the demand current of the target battery in the next charging stage.

[0011] Furthermore, step (F) includes: determining the quotient of the stage current difference of the target battery and the current response parameter as the response time of the next charging stage; if the response time of the next charging stage is less than the usage boundary exceeding time corresponding to the preset charging mode, determining the first preset value as the second current step of the target battery; if the response time of the next charging stage is not less than the usage boundary exceeding time corresponding to the preset charging mode, determining the product of the current response parameter and the usage boundary exceeding time corresponding to the preset charging mode as the second current step of the target battery.

[0012] Furthermore, the control method also includes: in the current charging stage, determining whether the demand current of the target battery in the current charging stage meets the current limiting condition corresponding to the preset charging mode; if the demand current of the target battery in the current charging stage meets the current limiting condition corresponding to the preset charging mode, then determining the product of the target battery's request current and a preset coefficient as the first safety request current of the target battery, so that the output current of the target charging pile is reduced to the safety request current of the target battery; when the output current of the target charging pile is reduced to the safety request current of the target battery, if the demand current of the target battery in the current charging stage does not meet the current limiting condition corresponding to the preset charging mode, then restoring the first safety request current of the target battery to the demand current of the current charging stage, so that the output current of the target charging pile reaches the demand current of the current charging stage.

[0013] In a second aspect, an embodiment of the present application further provides a battery charging current control device, the control device comprising: a first demand current determination module, which determines the demand current of the target battery in the initial charging stage based on the temperature and state of charge of the target battery; a first increase module, which increases the requested current of the target battery in the initial charging stage to the demand current of the initial charging stage according to a first current step, so that the output current of the target charging pile reaches the demand current interval corresponding to the initial charging stage; a parameter determination module, which determines the current response parameter of the target charging pile based on the output current of the target charging pile during the increase process; a stage conversion module, which determines that the target battery enters the next charging stage of the initial charging stage when the output current of the target charging pile reaches the demand current interval corresponding to the initial charging stage and the voltage of the target battery does not reach the cut-off voltage; a second demand current determination module, which determines the demand current of the target battery in the next charging stage based on the temperature and state of charge of the target battery; a step determination module, which determines the output current of the target battery in the initial charging stage based on the target battery The second current step of the target battery is determined based on the stage current difference of the target battery and the current response parameter; wherein the stage current difference is the difference between the demand current of the initial charging stage and the demand current of the next charging stage; a second increasing module increases the requested current of the target battery in the next charging stage to the demand current of the next charging stage according to the second current step, so that the output current of the target charging pile in the next charging stage reaches the demand current interval corresponding to the next charging stage; a re-acquisition module determines that the target battery enters the next charging stage of the next charging stage when the output current of the target charging pile in the next charging stage reaches the demand current interval corresponding to the next charging stage and the voltage of the target battery does not reach the cut-off voltage, and re-acquires the demand current of the next charging stage of the next charging stage, and returns to execute the second increasing module; a stop module controls the target charging pile to stop charging the target battery when the voltage of the target battery reaches the cut-off voltage.

[0014] In a third aspect, an embodiment of the present application further provides an electronic device comprising: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the battery charging current control method described in the first aspect or any possible implementation of the first aspect.

[0015] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of controlling the battery charging current described in the first aspect or any possible implementation of the first aspect are executed.

[0016] An embodiment of the present application provides a method for controlling battery charging current, which determines the required current of the target battery in the initial charging stage based on the temperature and state of charge of the target battery; increases the requested current of the target battery in the initial charging stage to the required current in the initial charging stage according to a first current step; during the increase, determines the current response parameter of the target charging pile based on the output current of the target charging pile; determines the second current step of the target battery based on the stage current difference and current response parameter of the target battery; the requested current corresponding to the subsequent charging stages is increased according to the second current step; when the voltage of the target battery reaches the cut-off voltage, controls the target charging pile to stop charging the target battery.

[0017] In this way, optimal control of the battery charging current is achieved, which shortens the charging time while effectively reducing the risk of overcharging and improving battery health.

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 One of the flow charts of a method for controlling battery charging current provided in an embodiment of the present application is shown; Figure 2 A second flowchart of a method for controlling battery charging current provided in an embodiment of the present application is shown; Figure 3 A third flowchart of a method for controlling battery charging current provided in an embodiment of the present application is shown; Figure 4 An example table of a three-dimensional mapping of temperature, SOC, and demand current provided in an embodiment of the present application is shown; Figure 5 A fourth flowchart of a method for controlling battery charging current provided in an embodiment of the present application is shown; Figure 6 One of the structural schematic diagrams of a battery charging current control device provided in an embodiment of the present application is shown; Figure 7 A second structural diagram of a battery charging current control device provided in an embodiment of the present application is shown; Figure 8 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of illustration and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts can be implemented out of sequence, and steps without logical context can be reversed or implemented simultaneously. In addition, those skilled in the art, under the guidance of the contents of this application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0022] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0023] The following methods, devices, electronic devices, or computer-readable storage media of the embodiments of the present application can be applied to any scenario requiring battery charging. The embodiments of the present application are not limited to specific application scenarios. Any scheme using the battery charging current control method and device provided by the embodiments of the present application is within the scope of protection of this application.

[0024] It's worth noting that with the increasing popularity of new energy vehicles, ensuring users experience optimal battery charging performance has become a key industry concern. Within this process, battery charging current control is a key technology for battery charging management. Accurate charging current control not only extends battery life but also improves battery safety and reliability. However, in practice, the response characteristics of different charging stations and the diverse charging needs of users can affect the performance of battery charging current control.

[0025] To address the above issues, the embodiments of the present application propose a method and device for controlling battery charging current to achieve optimized control of battery charging current, thereby shortening charging time, effectively reducing the risk of overcharging and improving battery health.

[0026] To facilitate understanding of the present application, the technical solutions provided in the present application are described in detail below in conjunction with specific embodiments.

[0027] See also Figure 1 , Figure 1 This is one of the flow charts of a method for controlling battery charging current provided in an embodiment of the present application.

[0028] like Figure 1 As shown in , the method for controlling the battery charging current provided in the embodiment of the present application includes the following steps: Step S101 : determining the required current of the target battery in an initial charging phase based on the temperature and state of charge of the target battery.

[0029] In this application, a three-dimensional mapping table is pre-set for the target battery temperature, state of charge (SOC), and required current. For example, when the target battery temperature is 10°C and the SOC is 20%, the preset temperature-SOC-required current mapping table is used to determine that the required current under this operating condition is 100A.

[0030] Step S102 : increasing the requested current of the target battery in the initial charging stage to the required current in the initial charging stage according to a first current step, so that the output current of the target charging pile reaches the required current range corresponding to the initial charging stage.

[0031] Here, the battery controller sends the target battery's requested current to the target charging pile, and the target charging pile outputs the actual charging current based on the target battery's requested current to charge the target battery. In the initial charging phase, the target battery's requested current increases from 0 until it reaches the target battery's required current Ic0. As an example, Iq=Iq'+ΔI', where Iq' is the requested current value at the previous increase moment of Iq, ΔI' is the first current step, ΔI' can be defined as Ic0 / 10, and ΔI' can also be defined in other forms, which are not limited here.

[0032] Step S103 : During the increasing process, the current response parameter of the target charging pile is determined based on the output current of the target charging pile.

[0033] The following combination Figure 2 To illustrate how to determine the current response parameters of the target charging pile based on the output current of the target charging pile.

[0034] See also Figure 2 , Figure 2 This is a second flow chart of a method for controlling battery charging current provided in an embodiment of the present application.

[0035] like Figure 2As shown in FIG, regarding step S103, in a specific implementation, as an example, the following steps may be included: Step S1031, during the increasing process, for each of the multiple increasing moments, the time from the increasing moment to the output current of the target charging pile reaching the preset output current range corresponding to the increasing moment is determined as the target charging pile response time corresponding to the increasing moment.

[0036] Here, the time it takes for the output current of the target charging pile to respond to each change in the requested current, ΔI', is calculated. When the target charging pile receives the demand current Iq command at time t0, the output current I of the target charging pile begins to dynamically adjust. When the output current satisfies I∈(Iq-ΔI1', Iq+ΔI1'), the charging pile is determined to have completed its current response and the output current is within the preset output current range. ΔI1' includes errors caused by current sampling, load consumption, and other factors, and its value range is [2A, 5A].

[0037] Step S1032: Determine the quotient of the first current step length and the target charging pile response time corresponding to the increasing moment as the current response parameter corresponding to the increasing moment.

[0038] Here, the current response parameter K corresponding to time t0 is t0 =ΔI' / t q Among them, t q is the target charging pile response time corresponding to time t0.

[0039] Step S1033: Determine the average value of the current response parameters corresponding to all the added moments as the current response parameter of the target charging pile.

[0040] Here, the current response parameters corresponding to each added moment are added and the average value is taken to obtain the current response parameter of the target charging pile.

[0041] See again Figure 1 In step S104 , when the output current of the target charging pile reaches the required current interval corresponding to the initial charging stage and the voltage of the target battery does not reach the cut-off voltage, it is determined that the target battery enters the next charging stage of the initial charging stage.

[0042] Here, when the voltage of the target battery reaches the cut-off voltage, it indicates that the target battery is fully charged.

[0043] Step S105 : determining the required current of the target battery in the next charging stage based on the temperature and the state of charge of the target battery.

[0044] The following combination Figure 3 To illustrate how to determine the current response parameters of the target charging pile based on the output current of the target charging pile.

[0045] See also Figure 3 , Figure 3 This is a third flow chart of a method for controlling battery charging current provided in an embodiment of the present application.

[0046] like Figure 3 As shown in FIG, regarding step S105, in a specific implementation, as an example, the following steps may be included: Step S1051 : determining at least one candidate required current of the target battery in the next charging stage based on the temperature and the state of charge of the target battery.

[0047] Here, by querying the preset temperature-SOC-demand current three-dimensional mapping table, the possible demand current of the target battery in the next charging stage is determined. As an example, Figure 4 As shown in , if the current temperature of the target battery is 10%, the SOC is 40%, and the corresponding demand current is Ic0, then the possible demand currents in the next charging stage are: Ic1, Ic2, Ic3, Ic4 and Ic5.

[0048] Step S1052 , screening out the largest candidate demand current from all candidate demand currents of the next charging stage, and screening out the smallest candidate demand current from all candidate demand currents of the next charging stage.

[0049] In step S1053, if the maximum candidate demand current and the minimum candidate demand current are both greater than the demand current of the initial charging stage, the temperature and state of charge of the target battery are reacquired, and the demand current of the next charging stage is determined based on the reacquired temperature and state of charge of the target battery.

[0050] Here, if the maximum candidate demand current and the minimum candidate demand current screened out are both greater than the demand current of the initial charging stage, the preset temperature-SOC-demand current three-dimensional mapping table is queried based on the temperature and state of charge of the target battery that are retrieved to determine the demand current of the next charging stage.

[0051] Step S1054 : If the largest candidate demand current and the smallest candidate demand current are both not greater than the demand current in the initial charging stage, the demand current of the target battery in the next charging stage is determined based on the preset charging mode of the target battery.

[0052] Here, the preset charging mode is a charging mode set by the user. The preset charging mode may include, but is not limited to, at least one of the following: fast charging mode, healthy charging mode, and balanced charging mode. Fast charging mode has the fastest charging speed but may slightly affect battery life. Healthy charging mode has a slower charging speed than fast charging mode but can extend battery life. Balanced charging mode has a charging speed and battery life that is between fast charging and healthy charging modes.

[0053] Regarding step S1054, in specific implementation, as an example, the following steps may be included: When the preset charging mode of the target battery is the extreme charging mode, if the difference between the maximum candidate demand current and the minimum candidate demand current is less than the safety margin compensation current corresponding to the extreme charging mode, the maximum candidate demand current is determined as the target battery's demand current for the next charging stage; wherein, the difference between the maximum candidate demand current and the minimum candidate demand current is less than the safety margin compensation current corresponding to the extreme charging mode, indicating that the target charging pile output current exceeds the target battery's charging current safety margin. If the difference between the maximum candidate demand current and the minimum candidate demand current is not less than the safety margin compensation current corresponding to the extreme charging mode, then the sum of the minimum candidate demand current and the safety margin compensation current corresponding to the extreme charging mode is determined as the target battery's demand current for the next charging stage; wherein, the difference between the maximum candidate demand current and the minimum candidate demand current is not less than the safety margin compensation current corresponding to the extreme charging mode, indicating that the target charging pile output current exceeds the target battery's charging current safety margin. Here, the use boundary is the target battery's maximum allowable charging current boundary, and the safety boundary is the target battery's limit charging current boundary.

[0054] When the preset charging mode of the target battery is the healthy charging mode, if the difference between the screened maximum candidate demand current and the screened minimum candidate demand current is less than the usage boundary compensation current corresponding to the healthy charging mode, the screened maximum candidate demand current is determined as the target battery's demand current in the next charging stage; wherein, the difference between the screened maximum candidate demand current and the screened minimum candidate demand current is less than the usage boundary compensation current corresponding to the healthy charging mode, indicating that the target charging pile output current does not exceed the target battery's charging current usage boundary. If the difference between the screened maximum candidate demand current and the screened minimum candidate demand current is not less than the usage boundary compensation current corresponding to the healthy charging mode, then the sum of the screened minimum candidate demand current and the usage boundary compensation current corresponding to the healthy charging mode is determined as the target battery's demand current in the next charging stage; wherein, the difference between the screened maximum candidate demand current and the screened minimum candidate demand current is not less than the usage boundary compensation current corresponding to the healthy charging mode, indicating that the target charging pile output current exceeds the target battery's charging current usage boundary.

[0055] When the preset charging mode of the target battery is the balanced charging mode, the average value of all candidate demand currents for the next charging stage is determined as the average candidate demand current for the next charging stage; if the difference between the average candidate demand current for the next charging stage and the screened minimum candidate demand current is less than the usage boundary compensation current corresponding to the balanced charging mode, the average candidate demand current for the next charging stage is determined as the target battery's demand current for the next charging stage; wherein, the difference between the screened maximum candidate demand current and the screened minimum candidate demand current is less than the usage boundary compensation current corresponding to the balanced charging mode, indicating that the target charging pile output current does not exceed the target battery's charging current usage boundary. If the difference between the average candidate demand current for the next charging stage and the screened minimum candidate demand current is not less than the usage boundary compensation current corresponding to the balanced charging mode, the sum of the screened minimum candidate demand current and the usage boundary compensation current corresponding to the balanced charging mode is determined as the target battery's demand current for the next charging stage; wherein, the difference between the screened maximum candidate demand current and the screened minimum candidate demand current is not less than the usage boundary compensation current corresponding to the balanced charging mode, indicating that the target charging pile output current exceeds the target battery's charging current usage boundary.

[0056] See again Figure 1 , step S106, determining a second current step length of the target battery based on the stage current difference of the target battery and the current response parameter.

[0057] The following combination Figure 5 It will be described how to determine the second current step length of the target battery based on the stage current difference of the target battery and the current response parameter.

[0058] See also Figure 5 , Figure 5 This is a fourth flow chart of a method for controlling battery charging current provided in an embodiment of the present application.

[0059] like Figure 5 As shown in FIG, regarding step S106, in a specific implementation, as an example, the following steps may be included: Step S1061 : determining the quotient of the stage current difference of the target battery and the current response parameter as the response time of the next charging stage.

[0060] Step S1062: If the response time of the next charging stage is less than the usage limit exceeding time corresponding to the preset charging mode, the first preset value is determined as the second current step of the target battery.

[0061] In this embodiment of the present application, the first preset value is 0. If the response time of the next charging phase is less than the usage limit exceeding time corresponding to the preset charging mode, it means that the response time of the target charging pile in the next charging phase is within the usage limit exceeding time corresponding to the preset charging mode. The requested current of the target battery can be directly converted to the demand current.

[0062] Here, the usage boundary over-limit time is less than the safety boundary over-limit time. There are differences in the values ​​of usage boundary compensation current, safety boundary compensation current, usage boundary over-limit time and safety boundary over-limit time of different mode preset charging modes. The usage boundary compensation current, safety boundary compensation current, usage boundary over-limit time and safety boundary over-limit time are determined according to the battery temperature, SOC and aging status. As an example, when the target battery is in a low temperature state or a high SOC or the target battery is aged, the values ​​of usage boundary compensation current, safety boundary compensation current, usage boundary over-limit time and safety boundary over-limit time of different mode preset charging modes will all decrease; the usage boundary compensation current, safety boundary compensation current, usage boundary over-limit time and safety boundary over-limit time corresponding to the healthy charging mode are less than the usage boundary compensation current, safety boundary compensation current, usage boundary over-limit time and safety boundary over-limit time corresponding to the balanced mode; the usage boundary compensation current and usage boundary over-limit time corresponding to the extreme charging mode are greater than the usage boundary compensation current and usage boundary over-limit time corresponding to the balanced mode.

[0063] Step S1063 : If the response time of the next charging stage is not less than the usage limit exceeding time corresponding to the preset charging mode, the current response parameter and the usage limit exceeding time corresponding to the preset charging mode are determined as the second current step of the target battery.

[0064] See again Figure 1In step S107, the requested current of the target battery in the next charging stage is increased to the required current of the next charging stage according to the second current step, so that the output current of the target charging pile in the next charging stage reaches the required current range corresponding to the next charging stage.

[0065] Step S108, when the output current of the target charging pile in the next charging stage reaches the demand current interval corresponding to the next charging stage and the voltage of the target battery has not reached the cut-off voltage, it is determined that the target battery enters the next charging stage of the next charging stage, and the demand current of the next charging stage of the next charging stage is re-obtained, and the execution returns to step S107.

[0066] Here, the requested current in the subsequent charging phase is increased according to the second current step size.

[0067] Step S109: When the voltage of the target battery reaches the cut-off voltage, the target charging pile is controlled to stop charging the target battery.

[0068] In this application, the battery charging current control method further includes: In the current charging stage, determine whether the demand current of the target battery in the current charging stage meets the current limiting condition corresponding to the preset charging mode; if the demand current of the target battery in the current charging stage meets the current limiting condition corresponding to the preset charging mode, then determine the product of the target battery's request current and the preset coefficient as the first safety request current of the target battery, so that the output current of the target charging pile is reduced to the safety request current of the target battery; when the output current of the target charging pile is reduced to the safety request current of the target battery, if the demand current of the target battery in the current charging stage does not meet the current limiting condition corresponding to the preset charging mode, then restore the first safety request current of the target battery to the demand current of the current charging stage, so that the output current of the target charging pile reaches the demand current of the current charging stage.

[0069] Here, the preset coefficient ranges from [0, 1]. Based on the preset charging mode, the optimal requested current is controlled to limit the requested current of the target battery while ensuring the charging speed and avoiding safety risks such as lithium plating.

[0070] When the preset charging mode of the target battery is the healthy charging mode or the balanced charging mode, the upper limit current is determined as the sum of the target battery's demand current in the current charging phase and the usage limit compensation current corresponding to the preset charging mode. The current limit condition corresponding to the preset charging mode is that the output current of the target charging pile is greater than the usage limit current, and the duration that the output current of the target charging pile exceeds the usage limit current is not less than the usage limit exceedance time corresponding to the preset charging mode.

[0071] When the target battery's preset charging mode is the extreme charging mode, the sum of the target battery's demand current during the current charging phase and the safety margin compensation current corresponding to the preset charging mode is determined as the upper safety limit current. The current limit condition corresponding to the preset charging mode is that the output current of the target charging pile exceeds the upper safety limit current, and the duration of the target charging pile's output current exceeding the upper safety limit current is not less than the safety margin excess time corresponding to the preset charging mode.

[0072] This application can output the optimal charging current based on the user's customized charging mode, while strictly adhering to the battery's usage and safety boundaries. This not only fully utilizes the battery's charging performance potential, but also enables refined current regulation based on the real-time response characteristics of the charging station, significantly improving charging efficiency while effectively avoiding the risk of overcharging, ultimately providing users with a safer, more efficient, and more personalized charging experience.

[0073] An embodiment of the present application provides a method for controlling battery charging current. By means of the method, optimal control of battery charging current is achieved, thereby shortening charging time while effectively reducing the risk of overcharging and improving battery health.

[0074] Based on the same application concept, the embodiments of the present application also provide a battery charging current control device corresponding to the battery charging current control method provided in the above embodiments. Since the principle of solving the problem by the device in the embodiments of the present application is similar to the battery charging current control method in the above embodiments of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0075] See also Figure 6 and Figure 7 , Figure 6 This is one of the structural diagrams of a battery charging current control device provided in an embodiment of the present application. Figure 7 This is a second structural diagram of a battery charging current control device provided in an embodiment of the present application.

[0076] like Figure 6 As shown in FIG, the battery charging current control device 610 provided in the embodiment of the present application includes: A first demand current determination module 611 determines a demand current of the target battery in an initial charging phase based on the temperature and state of charge of the target battery; A first increasing module 612 increases the requested current of the target battery in the initial charging phase to the required current of the initial charging phase according to a first current step size, so that the output current of the target charging pile reaches the required current range corresponding to the initial charging phase; The parameter determination module 613 determines the current response parameter of the target charging pile based on the output current of the target charging pile during the increase process; The stage conversion module 614 determines that the target battery enters the next charging stage of the initial charging stage when the output current of the target charging pile reaches the required current interval corresponding to the initial charging stage and the voltage of the target battery does not reach the cut-off voltage; A second demand current determination module 615 determines a demand current of the target battery in the next charging stage based on the temperature and state of charge of the target battery; a step size determination module 616 for determining a second current step size of the target battery based on a stage current difference of the target battery and the current response parameter; wherein the stage current difference is a difference between a required current of the initial charging stage and a required current of the next charging stage; The second increasing module 617 increases the requested current of the target battery in the next charging stage to the required current of the next charging stage according to the second current step size, so that the output current of the target charging pile in the next charging stage reaches the required current range corresponding to the next charging stage; The re-acquisition module 618 determines that the target battery enters the next charging stage after the next charging stage when the output current of the target charging pile in the next charging stage reaches the required current interval corresponding to the next charging stage and the voltage of the target battery has not reached the cut-off voltage, re-acquires the required current of the next charging stage after the next charging stage, and returns to execute the second adding module; The stop module 619 controls the target charging pile to stop charging the target battery when the voltage of the target battery reaches the cut-off voltage.

[0077] Furthermore, the parameter determination module 613 is specifically configured to: During the incrementing process, for each of the multiple incrementing moments, the time from the incrementing moment to the output current of the target charging pile reaching the preset output current range corresponding to the incrementing moment is determined as the target charging pile response time corresponding to the incrementing moment; Determine the quotient of the first current step length and the target charging pile response time corresponding to the increasing moment as the current response parameter corresponding to the increasing moment; The average value of the current response parameters corresponding to all the added moments is determined as the current response parameter of the target charging pile.

[0078] Furthermore, the second demand current determining module 615 is specifically configured to: determining, based on the temperature and the state of charge of the target battery, at least one candidate required current of the target battery in the next charging stage; Screening out a maximum candidate demand current from all candidate currents for the next charging stage, and screening out a minimum candidate demand current from all candidate currents for the next charging stage; If both the largest candidate demand current and the smallest candidate demand current are greater than the demand current of the initial charging stage, reacquiring the temperature and state of charge of the target battery, and determining the demand current of the next charging stage based on the reacquired temperature and state of charge of the target battery; If the largest candidate demand current and the smallest candidate demand current are both not greater than the demand current in the initial charging stage, the demand current of the target battery in the next charging stage is determined based on the preset charging mode of the target battery.

[0079] Furthermore, the preset charging mode includes an extreme charging mode; and the second demand current determination module 615, when used to determine the demand current of the target battery in the next charging stage based on the preset charging mode of the target battery, is further specifically configured to: When the preset charging mode of the target battery is the extreme charging mode, if the difference between the largest candidate demand current screened out and the smallest candidate demand current screened out is less than the safety margin compensation current corresponding to the extreme charging mode, then the largest candidate demand current screened out is determined as the demand current of the target battery in the next charging stage; If the difference between the largest screened candidate demand current and the smallest screened candidate demand current is not less than the safety margin compensation current corresponding to the extreme charging mode, the sum of the smallest screened candidate demand current and the safety margin compensation current corresponding to the extreme charging mode is determined as the demand current of the target battery in the next charging stage.

[0080] Furthermore, the preset charging mode includes a healthy charging mode; When used to determine the required current of the target battery in the next charging stage based on the preset charging mode of the target battery, the second required current determination module 615 is further specifically configured to: When the preset charging mode of the target battery is the healthy charging mode, if the difference between the screened maximum candidate demand current and the screened minimum candidate demand current is less than the usage boundary compensation current corresponding to the healthy charging mode, then the screened maximum candidate demand current is determined as the demand current of the target battery in the next charging stage; If the difference between the largest screened candidate demand current and the smallest screened candidate demand current is not less than the usage boundary compensation current corresponding to the healthy charging mode, the sum of the smallest screened candidate demand current and the usage boundary compensation current corresponding to the healthy charging mode is determined as the demand current of the target battery in the next charging stage.

[0081] Furthermore, the preset charging mode includes a healthy charging mode; When used to determine the required current of the target battery in the next charging stage based on the preset charging mode of the target battery, the second required current determination module 615 is further specifically configured to: When the preset charging mode of the target battery is the balanced charging mode, determining an average value of all candidate demand currents in the next charging stage as an average candidate demand current in the next charging stage; If the difference between the average candidate demand current of the next charging stage and the screened minimum candidate demand current is less than the usage boundary compensation current corresponding to the balanced charging mode, the average candidate demand current of the next charging stage is determined as the demand current of the target battery in the next charging stage; If the difference between the average candidate demand current and the screened minimum candidate demand current in the next charging stage is not less than the usage boundary compensation current corresponding to the balanced charging mode, the sum of the screened minimum candidate demand current and the usage boundary compensation current corresponding to the balanced charging mode is determined as the demand current of the target battery in the next charging stage.

[0082] Furthermore, the second adding module 617 is specifically configured to: Determining the quotient of the stage current difference of the target battery and the current response parameter as the response time of the next charging stage; If the response time of the next charging stage is less than the usage limit exceeding time corresponding to the preset charging mode, determining the first preset value as the second current step length of the target battery; If the response time of the next charging stage is not less than the usage limit exceeding time corresponding to the preset charging mode, the product of the current response parameter and the usage limit exceeding time corresponding to the preset charging mode is determined as the second current step of the target battery.

[0083] like Figure 7 As shown in , further, the control device 610 also includes: The limiting module 620 determines, in the current charging stage, whether the demand current of the target battery in the current charging stage meets the current limiting condition corresponding to the preset charging mode; if the demand current of the target battery in the current charging stage meets the current limiting condition corresponding to the preset charging mode, the product of the target battery's request current and the preset coefficient is determined as the first safety request current of the target battery, so that the output current of the target charging pile is reduced to the safety request current of the target battery; when the output current of the target charging pile is reduced to the safety request current of the target battery, if the demand current of the target battery in the current charging stage does not meet the current limiting condition corresponding to the preset charging mode, the first safety request current of the target battery is restored to the demand current of the current charging stage, so that the output current of the target charging pile reaches the demand current of the current charging stage.

[0084] An embodiment of the present application provides a battery charging current control device, through which optimized control of the battery charging current is achieved, thereby shortening the charging time while effectively reducing the risk of overcharging and improving battery health.

[0085] See also Figure 8 , Figure 8 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0086] like Figure 8 As shown in FIG, the electronic device 800 includes a processor 810, a memory 820 and a bus 830.

[0087] The memory 820 stores machine-readable instructions executable by the processor 810. When the electronic device 800 is running, the processor 810 communicates with the memory 820 via the bus 830. When the machine-readable instructions are executed by the processor 810, the above-mentioned Figure 1 、 Figure 2 、 Figure 3 and Figure 5 The specific implementation of the steps of the method for controlling the battery charging current in the method embodiment shown can be found in the method embodiment, and will not be repeated here.

[0088] The embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the computer program can execute the above-mentioned Figure 1 、 Figure 2 、 Figure 3 and Figure 5 The specific implementation of the steps of the method for controlling the battery charging current in the method embodiment shown can be found in the method embodiment, and will not be repeated here.

[0089] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0090] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0091] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0092] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0093] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for controlling battery charging current, characterized in that: The control method includes: (A) Determining the required current of the target battery during the initial charging phase based on the temperature and state of charge of the target battery; (B) increasing the requested current of the target battery in the initial charging stage to the required current in the initial charging stage according to a first current step, so that the output current of the target charging pile reaches the required current range corresponding to the initial charging stage; (C) During the increasing process, determining a current response parameter of the target charging pile based on the output current of the target charging pile; (D) when the output current of the target charging pile reaches the required current interval corresponding to the initial charging stage and the voltage of the target battery has not reached the cut-off voltage, determining that the target battery enters the next charging stage after the initial charging stage; (E) determining a required current of the target battery in the next charging stage based on the temperature and the state of charge of the target battery; (F) determining a second current step length of the target battery based on a stage current difference of the target battery and the current response parameter, wherein the stage current difference is a difference between a required current of the initial charging stage and a required current of the next charging stage; (G) increasing the requested current of the target battery in the next charging stage to the required current of the next charging stage according to the second current step, so that the output current of the target charging pile in the next charging stage reaches the required current range corresponding to the next charging stage; (H) when the output current of the target charging pile in the next charging stage reaches the required current interval corresponding to the next charging stage and the voltage of the target battery has not reached the cut-off voltage, determining that the target battery enters the next charging stage of the next charging stage, and re-obtaining the required current of the next charging stage of the next charging stage, and returning to step (G); (I) When the voltage of the target battery reaches the cut-off voltage, the target charging pile is controlled to stop charging the target battery.

2. The method for controlling battery charging current according to claim 1, wherein: The step (C) comprises: During the adding process, for each of the multiple adding moments, the time from the adding moment to the output current of the target charging pile reaching the preset output current range corresponding to the adding moment is determined as the target charging pile response time corresponding to the adding moment; Determine the quotient of the first current step length and the target charging pile response time corresponding to the increasing moment as the current response parameter corresponding to the increasing moment; The average value of the current response parameters corresponding to all the added moments is determined as the current response parameter of the target charging pile.

3. The method for controlling battery charging current according to claim 1, wherein: The step (E) comprises: determining, based on the temperature and the state of charge of the target battery, at least one candidate required current of the target battery in the next charging stage; Screening out a maximum candidate demand current from all candidate currents for the next charging stage, and screening out a minimum candidate demand current from all candidate currents for the next charging stage; If both the largest candidate demand current and the smallest candidate demand current are greater than the demand current of the initial charging stage, reacquiring the temperature and state of charge of the target battery, and determining the demand current of the next charging stage based on the reacquired temperature and state of charge of the target battery; If the largest candidate demand current and the smallest candidate demand current are both not greater than the demand current in the initial charging stage, the demand current of the target battery in the next charging stage is determined based on the preset charging mode of the target battery.

4. The method for controlling battery charging current according to claim 3, wherein: The preset charging mode includes an extreme-speed charging mode; The determining, based on the preset charging mode of the target battery, the required current of the target battery in the next charging stage includes: When the preset charging mode of the target battery is the extreme charging mode, if the difference between the largest candidate demand current screened out and the smallest candidate demand current screened out is less than the safety margin compensation current corresponding to the extreme charging mode, then the largest candidate demand current screened out is determined as the demand current of the target battery in the next charging stage; If the difference between the largest screened candidate demand current and the smallest screened candidate demand current is not less than the safety margin compensation current corresponding to the extreme charging mode, the sum of the smallest screened candidate demand current and the safety margin compensation current corresponding to the extreme charging mode is determined as the demand current of the target battery in the next charging stage.

5. The method for controlling battery charging current according to claim 3, wherein: The preset charging mode includes a healthy charging mode; The determining, based on the preset charging mode of the target battery, the required current of the target battery in the next charging stage includes: When the preset charging mode of the target battery is the healthy charging mode, if the difference between the screened maximum candidate demand current and the screened minimum candidate demand current is less than the usage boundary compensation current corresponding to the healthy charging mode, then the screened maximum candidate demand current is determined as the demand current of the target battery in the next charging stage; If the difference between the largest screened candidate demand current and the smallest screened candidate demand current is not less than the usage boundary compensation current corresponding to the healthy charging mode, the sum of the smallest screened candidate demand current and the usage boundary compensation current corresponding to the healthy charging mode is determined as the demand current of the target battery in the next charging stage.

6. The method for controlling battery charging current according to claim 3, wherein: The preset charging mode includes a healthy charging mode; The determining, based on the preset charging mode of the target battery, the required current of the target battery in the next charging stage includes: When the preset charging mode of the target battery is the balanced charging mode, determining an average value of all candidate demand currents in the next charging stage as an average candidate demand current in the next charging stage; If the difference between the average candidate demand current of the next charging stage and the screened minimum candidate demand current is less than the usage boundary compensation current corresponding to the balanced charging mode, the average candidate demand current of the next charging stage is determined as the demand current of the target battery in the next charging stage; If the difference between the average candidate demand current and the screened minimum candidate demand current in the next charging stage is not less than the usage boundary compensation current corresponding to the balanced charging mode, the sum of the screened minimum candidate demand current and the usage boundary compensation current corresponding to the balanced charging mode is determined as the demand current of the target battery in the next charging stage.

7. The method for controlling battery charging current according to claim 3, wherein: The step (F) comprises: Determining the quotient of the stage current difference of the target battery and the current response parameter as the response time of the next charging stage; If the response time of the next charging stage is less than the usage limit exceeding time corresponding to the preset charging mode, determining the first preset value as the second current step length of the target battery; If the response time of the next charging stage is not less than the usage limit exceeding time corresponding to the preset charging mode, the product of the current response parameter and the usage limit exceeding time corresponding to the preset charging mode is determined as the second current step of the target battery.

8. The method for controlling battery charging current according to claim 3, wherein: The control method further includes: In the current charging stage, determining whether the required current of the target battery in the current charging stage meets the current limiting condition corresponding to the preset charging mode; If the target battery's demand current in the current charging phase meets the current limit condition corresponding to the preset charging mode, the product of the target battery's demand current and the preset coefficient is determined as the target battery's first safety request current, so that the target charging pile's output current is reduced to the target battery's safety request current; When the output current of the target charging pile is reduced to the safety request current of the target battery, if the demand current of the target battery in the current charging stage does not meet the current limit condition corresponding to the preset charging mode, the first safety request current of the target battery is restored to the demand current of the current charging stage so that the output current of the target charging pile reaches the demand current of the current charging stage.

9. A battery charging current control device, characterized in that: The control device comprises: a first demand current determination module, which determines a demand current of the target battery in an initial charging phase based on a temperature and a state of charge of the target battery; A first increasing module increases the requested current of the target battery in the initial charging stage to the required current of the initial charging stage according to a first current step size, so that the output current of the target charging pile reaches the required current range corresponding to the initial charging stage; a parameter determination module, which determines a current response parameter of the target charging pile based on the output current of the target charging pile during the addition process; a stage conversion module, which determines that the target battery enters the next charging stage of the initial charging stage when the output current of the target charging pile reaches the required current interval corresponding to the initial charging stage and the voltage of the target battery does not reach the cut-off voltage; a second demand current determining module, which determines a demand current of the target battery in the next charging stage based on the temperature and the state of charge of the target battery; a step size determination module, configured to determine a second current step size of the target battery based on a stage current difference of the target battery and the current response parameter; wherein the stage current difference is a difference between a required current of the initial charging stage and a required current of the next charging stage; a second increasing module, increasing the requested current of the target battery in the next charging stage to the required current of the next charging stage according to the second current step size, so that the output current of the target charging pile in the next charging stage reaches the required current range corresponding to the next charging stage; a re-acquisition module, which determines that the target battery enters the next charging stage of the next charging stage when the output current of the target charging pile in the next charging stage reaches the required current interval corresponding to the next charging stage and the voltage of the target battery has not reached the cut-off voltage, re-acquires the required current of the next charging stage of the next charging stage, and returns to execute the second adding module; The stop module controls the target charging pile to stop charging the target battery when the voltage of the target battery reaches the cut-off voltage.

10. An electronic device, characterized in that: include: A processor, a memory, and a bus, wherein the memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor and the memory communicate via the bus. When the processor is running, the machine-readable instructions execute the steps of the battery charging current control method as described in any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for controlling the battery charging current according to any one of claims 1 to 8 are executed.

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