Battery charging method and battery management system thereof

Abstract

The application provides a battery charging method and a battery management system thereof. The method comprises: obtaining a charging time and a charging quantity percentage required for the battery to be fully charged in a specified SOC interval, wherein the charging stage corresponding to the specified SOC interval is configured to be divided into a first charging stage and at least one second charging stage, the first charging stage is configured as a fast charging stage, and the second charging stage is configured as a non-fast charging stage; adjusting an initial charging rate of the first charging stage to obtain a first charging rate, and adjusting an initial charging rate of the second charging stage to obtain a second charging rate, wherein the first charging rate is less than the initial charging rate of the first charging stage; and charging the battery by using the first charging rate and the second charging rate, so that the sum of the first charging time and the second charging time is equal to the charging time.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery charging method and its battery management system. Background Technology

[0002] With the development of new energy vehicles, electric vehicles have gradually become the main means of transportation for people's daily lives. The power of electric vehicles mainly comes from the battery system.

[0003] In related technologies, in order to meet users' demands for charging speed, battery systems need to be charged with sufficient power in a short time. This places high demands on the overcurrent and heat dissipation of the battery system, leading to an increase in battery system costs. Summary of the Invention

[0004] This application provides a battery charging method and a battery management system thereof, which aims to reduce the cost of the battery system by optimizing the battery charging method.

[0005] On one hand, this application provides a battery charging method, the method comprising:

[0006] The charging time and percentage of charge required to fully charge the battery to a specified SOC range are obtained, wherein the charging phase corresponding to the specified SOC range is configured to be divided into a first charging phase and at least one second charging phase, the first charging phase is configured as a fast charging phase, and the second charging phase is configured as a non-fast charging phase.

[0007] The initial charging rate of the first charging stage is adjusted to obtain a first charging rate, and the initial charging rate of the second charging stage is adjusted to obtain a second charging rate, wherein the first charging rate is less than the initial charging rate of the first charging stage.

[0008] The battery is charged using the first charging rate and the second charging rate, such that the sum of the first charging time and the second charging time is equal to the total charging time. The first charging time is the time required to fully charge the first charging stage using the first charging rate, and the second charging time is the time required to fully charge the second charging stage using the second charging rate.

[0009] In one embodiment, the step of adjusting the charging rate of the first charging stage to obtain the first charging rate includes:

[0010] The first charging time is determined based on the charging time.

[0011] The first charge percentage is determined based on the charge percentage.

[0012] The first charging rate is obtained by adjusting the charging rate of the first charging stage based on the first charging time and the first charging amount percentage.

[0013] In one embodiment, the step of determining the first charging time based on the charging time includes:

[0014] Obtain the second charging time;

[0015] The first charging time is obtained by subtracting the second charging time from the first charging time.

[0016] In one embodiment, each of the second charging stages is configured to be divided into multiple sub-charging stages;

[0017] The step of obtaining the second charging time includes:

[0018] Obtain the third charging rate for each sub-charging stage;

[0019] Obtain the third percentage of charge for each sub-charging stage;

[0020] The ratio calculated by comparing the third charge percentage with the third charge rate is used as the third charging time required to fully charge each sub-charging stage.

[0021] Add up the third charging times required for all sub-charging stages, and the sum is the total second charging time required to fully charge all second charging stages.

[0022] In one embodiment, the step of obtaining the third charging rate for each sub-charging stage includes:

[0023] Obtain the maximum charging rate for each sub-charging stage;

[0024] Obtain the safety factor of the third charging rate for each sub-charging stage;

[0025] The safety factor is multiplied by the limit charging rate, and the product is used as the third charging rate for each sub-charging stage.

[0026] In one embodiment, charging the battery using the second charging rate includes:

[0027] In each sub-charging stage of the second charging stage, the battery is charged using the corresponding third charging rate.

[0028] In one embodiment, the step of adjusting the charging rate of the first charging stage to obtain the first charging rate based on the first charging time and the first charging amount percentage includes:

[0029] The ratio obtained by comparing the first percentage of charge amount with the first charging time is taken as the first charging rate.

[0030] In one embodiment, the step of determining the first charge percentage based on the charge percentage includes:

[0031] Obtain the second percentage of charge;

[0032] The difference between the first charge percentage and the second charge percentage is taken as the percentage of the first charge that is fully charged.

[0033] In one embodiment, each of the second charging stages is configured to be divided into multiple sub-charging stages;

[0034] The step of obtaining the second charge percentage includes:

[0035] Obtain the third percentage of charge for each sub-charging stage;

[0036] The second charge percentage is obtained by summing the third charge percentages of all sub-charging stages.

[0037] On the other hand, this application also provides a battery management system, the battery management system comprising:

[0038] One or more processors;

[0039] Memory; and

[0040] One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the battery charging method.

[0041] On the other hand, this application also provides a computer-readable storage medium having a computer program stored thereon, the computer program being loaded by a processor to perform the steps in the battery charging method.

[0042] On the other hand, embodiments of this application also provide a computer program product, including a computer program or instructions, and steps in the battery charging method when the computer program or instructions are executed by a processor.

[0043] In this embodiment, a specified SOC range is divided into a first charging stage and at least one second charging stage. The first charging stage is configured as a fast charging stage, and the second charging stage is configured as a non-fast charging stage. Then, the initial charging rate of the first charging stage and the initial charging rate of the second charging stage are balanced to obtain corresponding first charging rate and second charging rate, respectively. The first charging rate is less than the initial charging rate of the first charging stage. The battery is then charged using the first charging rate and the second charging rate, so that the sum of the first charging time and the second charging time is equal to the total charging time. The first charging time is the time required to fully charge the first charging stage using the first charging rate, and the second charging time is the time required to fully charge the second charging stage using the second charging rate. This ensures that the initial charging rate, i.e., the maximum charging rate, of the battery during the actual charging process is reduced while the overall charging time remains unchanged. This reduces the overcurrent and heat dissipation requirements of the battery system, reduces the design cost of the battery system, and further reduces the overall cost of the battery system. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic flowchart of an embodiment of the battery charging method provided in this application.

[0046] Figure 2 This is a schematic flowchart of another embodiment of the battery charging method provided in this application;

[0047] Figure 3 This is a schematic diagram of the SOC-charging rate curves of the battery provided in the embodiments of this application at different charging stages;

[0048] Figure 4 This is a schematic diagram of an embodiment of the battery management system provided in this application. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0052] Because battery systems in related technologies need to quickly charge to meet users' demands for fast charging speeds, this places high demands on overcurrent and heat dissipation, leading to increased battery system costs. Therefore, this application provides a battery charging method and its battery management system. This method divides a specified SOC range into a first charging stage and at least one second charging stage. The first charging stage is configured as a fast charging stage, and the second charging stage is configured as a non-fast charging stage. Then, the initial charging rate of the first charging stage and the initial charging rate of the second charging stage are balanced to obtain corresponding first and second charging rates, respectively. The first charging rate is less than the second charging rate. The initial charging rate of the first charging stage is used, and then the battery is charged using the first charging rate and the second charging rate, so that the sum of the first charging time and the second charging time is equal to the total charging time. The first charging time is the time required to fully charge the first charging stage using the first charging rate, and the second charging time is the time required to fully charge the second charging stage using the second charging rate. This ensures that the initial charging rate (i.e., the maximum charging rate) of the battery during actual charging is reduced while maintaining the overall charging time. This reduces the overcurrent and heat dissipation requirements of the battery system, lowers the design cost of the battery system, and further reduces the overall cost of the battery system. Please refer to the detailed description below for specific details.

[0053] Next, we will introduce the battery charging method provided in the embodiments of this application.

[0054] In the embodiments of the battery charging method of this application, a battery management system is used as the execution subject. For simplicity and ease of description, this execution subject will be omitted in subsequent method embodiments. The method includes: obtaining the charging time and percentage of charge required to fully charge the battery to a specified SOC range, wherein the charging stage corresponding to the specified SOC range is configured to be divided into a first charging stage and at least one second charging stage, the first charging stage is configured as a fast charging stage, and the second charging stage is configured as a non-fast charging stage; adjusting the initial charging rate of the first charging stage to obtain a first charging rate, and adjusting the initial charging rate of the second charging stage to obtain a second charging rate, wherein the first charging rate is less than the initial charging rate of the first charging stage; charging the battery using the first charging rate and the second charging rate, such that the sum of the first charging time and the second charging time is equal to the charging time, wherein the first charging time is the time required to fully charge the first charging stage using the first charging rate, and the second charging time is the time required to fully charge the second charging stage using the second charging rate.

[0055] The battery charging method described in this application will be described in detail below with reference to the accompanying drawings. Although this application provides method operation steps as shown in the following embodiments or drawings, more or fewer operation steps may be included in the method based on conventional or non-inventive effort. For steps that do not have a logically necessary causal relationship, the execution order of these steps is not limited to the execution order provided in the embodiments of this application. In actual object processing or device execution, the method may be executed in the order shown in the embodiments or drawings, or in parallel (e.g., in a parallel processor or multi-threaded processing environment).

[0056] Please see Figures 1 to 3 , Figure 1 This is a schematic flowchart of an embodiment of the battery charging method provided in this application, which includes steps 201 to 205:

[0057] 201. Obtain the charging time and percentage of charge required to fully charge the battery to a specified SOC range, wherein the charging stage corresponding to the specified SOC range is configured to be divided into a first charging stage and at least one second charging stage, the first charging stage is configured as a fast charging stage, and the second charging stage is configured as a non-fast charging stage.

[0058] In this embodiment, the battery's SOC (State of Charge) refers to the percentage of the battery's current remaining capacity relative to its total capacity when fully charged. This parameter is used to represent the battery's charge level or remaining capacity, and is typically expressed as a percentage.

[0059] Specifically, the formula for calculating SOC is:

[0060] SOC=Q_remain / Q_rated×100%;

[0061] Where Q_remain is the current remaining charge of the battery, and Q_rated is the nominal (rated) charge capacity of the battery. This application uses SOC as a core parameter.

[0062] The specified SOC range is predefined, and the corresponding percentage of charge can be set according to actual needs. For example, it can include 10% to 80%, 30% to 80%, 10% to 90%, or 0% to 100% of the entire SOC range.

[0063] The charging time required to fully charge a specified SOC range is preset, and its specific duration is usually related to the size of the specified SOC range. It can be set according to actual needs, for example, the charging time can be 5min, 10min, 12min, 15min, 18min, 20min or 25min.

[0064] In the entire charging process of the battery, the charging rate corresponding to the fast charging stage is the maximum charging rate. This application reduces the maximum charging rate of the battery to reduce the overcurrent and temperature of the battery during the charging process using the maximum charging rate. This reduces the peak overcurrent and peak high temperature during the entire charging process, thereby reducing the requirements for overcurrent and heat dissipation of the battery system and further reducing the design cost of the battery system.

[0065] At least one second charging stage may be one, two or more, but regardless of the number, the first charging stage and at least one second charging stage are interconnected as a whole.

[0066] In one specific embodiment, such as Figure 3 As shown, at least one second charging stage includes three second charging stages, namely, a pre-charging stage, a fast charging current reduction stage, and an end-of-charge current reduction stage.

[0067] The pre-charging phase is the pre-charging stage before actual charging, during which the charging rate gradually increases; the fast charging phase has a charging rate k... m The maximum charging rate during the charging process; the fast charging current reduction stage is the charging stage where the charging rate decreases after fast charging, and its charging rate gradually decreases; the final current reduction stage is the low-rate charging stage when the battery is almost fully charged; the charging rates of each stage satisfy the following relationship: k1 < k2, k2 < k3…k m-1 <k m ;k m >k m+1 k m+1 >k m+2 …k n-2 >k n-1 k n-1 >k n .

[0068] Figure 3 In this process, each charging stage is further divided into multiple sub-charging stages, and the actual charging rate k in each sub-stage is less than the maximum charging rate k. / The limit charge rate is the boundary charge rate at which lithium plating failure occurs during charging. This is a preset parameter that can be obtained from a preset target storage object.

[0069] It should be noted that the non-fast charging stage refers to a target charging stage that is different from the fast charging stage. In fact, this target charging stage also belongs to the charging stage of "fast charging". This "fast charging" is different from "slow charging". Generally speaking, the main difference between "fast charging" and "slow charging" is the charging method. That is, "fast charging" is DC charging and "slow charging" is AC charging.

[0070] 202. Adjust the initial charging rate of the first charging stage to obtain a first charging rate, and adjust the initial charging rate of the second charging stage to obtain a second charging rate, wherein the first charging rate is less than the initial charging rate of the first charging stage.

[0071] During the entire first charging phase, the charging rate can be constant. For example, if the first charging phase is 10% to 65% SOC, then the corresponding charging rate is the same at 10%, 15%, 25%, 65%, or any of these SOCs.

[0072] In addition, the initial charging rate of the first charging stage is characterized as the initial charging rate determined before this charging, while the first charging rate is the adjusted charging rate.

[0073] In some embodiments, the step of adjusting the initial charging rate of the second charging stage to obtain the second charging rate may include: adjusting the initial charging rate of each of the at least one second charging stage to obtain its corresponding second charging rate.

[0074] The second charging rate refers to the average charging rate across all second charging phases. As explained below, each second charging phase is further divided into multiple sub-charging phases.

[0075] In some embodiments, the step of adjusting the initial charging rate of the second charging stage to obtain the second charging rate may include: adjusting the initial charging rate of at least one target second charging stage in at least one of the second charging stages to obtain the corresponding second charging rate.

[0076] In some embodiments, such as Figure 2 As shown, the step of adjusting the charging rate of the first charging stage to obtain the first charging rate may specifically include steps 2021 to 2023:

[0077] 2021. Determine the first charging time based on the charging time;

[0078] In some embodiments, the step of determining the first charging time based on the charging time may include: obtaining the second charging time; and subtracting the second charging time from the first charging time to obtain the first charging time.

[0079] In some embodiments, each of the second charging stages is configured to be divided into multiple sub-charging stages, wherein the number of sub-charging stages can be set according to actual needs. For example, it can be two, three, or more.

[0080] The step of obtaining the second charging time includes: obtaining the third charging rate of each sub-charging stage; obtaining the third charging percentage of each sub-charging stage; comparing the third charging percentage with the third charging rate, and calculating the ratio as the third charging time required to fully charge each sub-charging stage; adding the third charging times required for all sub-charging stages, and calculating the sum as the total second charging time required to fully charge all second charging stages.

[0081] In some embodiments, the step of obtaining the third charging rate for each sub-charging stage includes: obtaining the maximum charging rate for each sub-charging stage; obtaining a safety factor for the third charging rate for each sub-charging stage; multiplying the safety factor by the maximum charging rate, and using the product as the third charging rate for each sub-charging stage.

[0082] As mentioned above, the limit charge rate is the boundary charge rate at which lithium plating failure occurs during charging. This is a preset parameter that can be obtained from a preset target storage object.

[0083] Let a1, a2, ... a m-1 a m+1 …a n-1 a n The safety factor for each sub-charging stage satisfies 0 ≤ a n <1, where, similar to the limit charging rate, the safety factor can also be a preset parameter, which can be obtained from a preset target storage object.

[0084] In one embodiment, the step of obtaining the safety factor of the third charging rate for each sub-charging stage may include: obtaining the internal resistance of the battery corresponding to each sub-charging stage, and determining the safety factor of the third charging rate for each sub-charging stage based on the internal resistance and the relationship between the internal resistance and the preset internal resistance and the safety factor.

[0085] The internal resistance of the battery in each sub-charging stage can also be a preset value, that is, a value that is measured in advance and stored in the target storage object.

[0086] In one specific embodiment, the value is set based on the relationship between the internal resistance value at the current SOC stage and the average internal resistance R from 0% SOC to 100% SOC. If the cell internal resistance at the current SOC stage is greater than the average internal resistance R from 0% SOC to 100% SOC, the value is 0.7; if the cell internal resistance at the current SOC stage is less than or equal to the average internal resistance R from 0% SOC to 100% SOC, the value is 0.8; when a n A value of 0 indicates that this stage does not exist.

[0087] 2022. Determine the first charging percentage based on the stated charging percentage;

[0088] In some embodiments, the step of determining the first charge percentage based on the charge percentage includes: obtaining the second charge percentage; subtracting the charge percentage from the second charge percentage, and using the difference as the percentage of the first charge that is fully charged.

[0089] In some embodiments, each of the second charging stages is configured to be divided into multiple sub-charging stages.

[0090] The step of obtaining the second charge percentage includes: obtaining the third charge percentage for each sub-charging stage; and adding the third charge percentages of all sub-charging stages to obtain the second charge percentage.

[0091] In some embodiments, obtaining the third charge percentage for each sub-charging stage may include: obtaining the internal resistance of the battery at different charging stages, and determining the third charge percentage for each sub-charging stage based on the internal resistance and a preset internal resistance.

[0092] The internal resistance of the battery at different charging stages can also be a preset value, that is, a value that is measured in advance and stored in the target storage object.

[0093] The percentage of the third charge in each sub-charging stage can be divided according to the battery's internal resistance. Specifically, let △SOC1, △SOC2, △SOC3...△SOC m-1 △SOC m+1 …△SOC n-1 △SOC n This represents the third percentage of charge for each sub-charging stage. It can be divided based on the difference in cell internal resistance. For example, if the difference in internal resistance between the current SOC range and the next SOC range is ≥10%, then a SOC range is defined. For instance, if the internal resistance of the 0%–5% SOC range is 1.1R, and the internal resistance of the 5%–10% SOC range is R, with a resistance difference of 0.1R and ≥10%, then it is divided into two SOC ranges: △SOC1 (0%–5%) and △SOC2 (5%–10%), and so on.

[0094] 2023. Based on the first charging time and the first charging amount percentage, adjust the charging rate of the first charging stage to obtain the first charging rate.

[0095] In some embodiments, the step of adjusting the charging rate of the first charging stage to obtain the first charging rate based on the first charging time and the first charging amount percentage includes: comparing the first charging amount percentage with the first charging time, and using the resulting ratio as the first charging rate.

[0096] To facilitate understanding of the above data processing procedure, the specific calculation process is provided below:

[0097] Let the first charging time be t. m , t m It can be calculated using the following formula (1):

[0098]

[0099] The first charge percentage is △SOC. m , △SOC m It can be calculated using the following formula (2):

[0100] ΔSOC m =ΔSOC-ΔSOC1-ΔSOC2-…-ΔSOC m-1 -ΔSOC m+1 -…-ΔSOC n-1 -ΔSOC n …(2)

[0101] The first charging rate is k. m k m It can be calculated using the following formula (3):

[0102]

[0103] Among them, t1, t2, t3…t m-1 t m+1 …t n-1 t n The charging time for each stage satisfies the following relationship:

[0104]

[0105] k1=a1k / 1, k2 = a2k / 2…k m-1 =a m-1 k / m-1 k m+1 =a m+1 k / m+1 …k n-1 =a n-1 k / n-1 k n =a n k / n k is the actual charging rate, k / This represents the maximum charging rate. The actual charging rate k in each sub-stage is less than the maximum charging rate k. / .

[0106] Among them, a1, a2…a m-1 a m+1 …an -1 a n The safety factor for the charging rate of each sub-charging stage.

[0107] 203. Charge the battery using the first charging rate and the second charging rate, such that the sum of the first charging time and the second charging time is equal to the charging time, wherein the first charging time is the time required to fully charge the first charging stage using the first charging rate, and the second charging time is the time required to fully charge the second charging stage using the second charging rate.

[0108] Here, "fully charging the second charging stage" means fully charging all the second charging stages in at least one second charging stage.

[0109] Dividing the battery's State of Charge (SOC) into multiple charging stages refers to dividing the charging process into different stages based on different SOC ranges. Each stage corresponds to a SOC range, such as from 0% to 25%, 25% to 50%, and so on.

[0110] Specifically, when the battery's State of Charge (SOC) reaches a certain value, it enters the next charging stage. For example, if a battery is divided into four stages, with each stage separated by 25%, then when the SOC increases from 0% to 25%, the battery is in the first charging stage; when the SOC increases from 25% to 50%, the battery is in the second charging stage, and so on.

[0111] This segmentation method helps to better control the charging process, ensuring that the battery receives appropriate charging current and voltage at different stages, thereby improving charging efficiency and safety. Furthermore, this multi-stage charging strategy can optimize battery performance and lifespan by adjusting the charging parameters (such as current and voltage) at each stage.

[0112] In some embodiments, charging the battery using the second charging rate includes: charging the battery using the corresponding third charging rate in each sub-charging stage of the second charging stage.

[0113] In one specific embodiment, the charging time in the 0% to 80% SOC range is required to be no more than 25 minutes.

[0114] The 0% to 80% SOC range is divided into three stages: pre-charge stage, fast charge stage, and fast charge current reduction stage.

[0115] (1) Pre-charge stage:

[0116] The pre-charge phase corresponds to the 0% to 10% SOC range:

[0117] Maximum charging rate k / 1 = 3; safety factor a1 = 0.5; charging rate k1 = 1.5; charging time t1 = △SOC1 / k1 = 4 min.

[0118] (2) Fast charging current reduction stage:

[0119] ①65%~70% SOC range:

[0120] Maximum charging rate k / 3 = 2.5; safety factor a3 = 0.8; charging rate k3 = 2.0; charging time t3 = △SOC3 / k3 = 1.5 min.

[0121] ②70%–75% SOC range:

[0122] Maximum charging rate k / 4 = 2.0; safety factor a4 = 0.75; charging rate k4 = 1.5; charging time t4 = △SOC4 / k4 = 2min.

[0123] ③ 75%–80% SOC range:

[0124] Maximum charging rate k / 5 = 2.0; safety factor a5 = 0.75; charging rate k5 = 1.5; charging time t5 = △SOC5 / k5 = 2min.

[0125]

[0126] (3) Fast charging stage:

[0127] Fast charging corresponds to the 10%–65% SOC range:

[0128] Maximum charging rate k / 2 = 3;

[0129] Charging time t2 = t0 - t1 - t3 - t4 - t5 = 25 - 4 - 1.5 - 2 - 2 = 15.5 min;

[0130] The charging rate k2 = ΔSOC2 / t2 = 2.13 < k / 2 = 3.

[0131] In this embodiment, a specified SOC range is divided into a first charging stage and at least one second charging stage. The first charging stage is configured as a fast charging stage, and the second charging stage is configured as a non-fast charging stage. Then, the initial charging rate of the first charging stage and the initial charging rate of the second charging stage are balanced to obtain corresponding first charging rate and second charging rate, respectively. The first charging rate is less than the initial charging rate of the first charging stage. The battery is then charged using the first charging rate and the second charging rate, so that the sum of the first charging time and the second charging time is equal to the total charging time. The first charging time is the time required to fully charge the first charging stage using the first charging rate, and the second charging time is the time required to fully charge the second charging stage using the second charging rate. This ensures that the initial charging rate, i.e., the maximum charging rate, of the battery during the actual charging process is reduced while the overall charging time remains unchanged. This reduces the overcurrent and heat dissipation requirements of the battery system, reduces the design cost of the battery system, and further reduces the overall cost of the battery system.

[0132] Based on the same inventive concept, embodiments of this application also provide a battery management system. This battery management system can be a server or a terminal device. The battery management system includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps of the aforementioned battery charging method. This enables various functions, such as: obtaining the charging time and percentage of charge required to fully charge the battery within a specified SOC range, wherein the charging stage corresponding to the specified SOC range is configured to be divided into a first charging stage and at least one second charging stage, the first charging stage being configured as a fast charging stage and the second charging stage as a non-fast charging stage; adjusting the initial charging rate of the first charging stage to obtain a first charging rate, and adjusting the initial charging rate of the second charging stage to obtain a second charging rate, wherein the first charging rate is less than the initial charging rate of the first charging stage; charging the battery using the first charging rate and the second charging rate such that the sum of the first charging time and the second charging time is equal to the total charging time, wherein the first charging time is the time required to fully charge the first charging stage using the first charging rate, and the second charging time is the time required to fully charge the second charging stage using the second charging rate.

[0133] The battery management system provided in this application divides a specified SOC range into a first charging stage and at least one second charging stage. The first charging stage is configured as a fast charging stage, and the second charging stage is configured as a non-fast charging stage. Then, the initial charging rate of the first charging stage and the initial charging rate of the second charging stage are balanced to obtain corresponding first charging rate and second charging rate, respectively. The first charging rate is less than the initial charging rate of the first charging stage. The battery is then charged using the first charging rate and the second charging rate, so that the sum of the first charging time and the second charging time is equal to the total charging time. The first charging time is the time required to fully charge the first charging stage using the first charging rate, and the second charging time is the time required to fully charge the second charging stage using the second charging rate. This ensures that the initial charging rate, i.e., the maximum charging rate, of the battery is reduced during the actual charging process while the overall charging time remains unchanged. This reduces the overcurrent and heat dissipation requirements of the battery system, reduces the design cost of the battery system, and further reduces the overall cost of the battery system.

[0134] For details on the implementation of each of the above operations, please refer to the previous examples, which will not be repeated here.

[0135] In one embodiment, the battery management system is exemplified by a terminal device, and its internal structure diagram can be as follows: Figure 4 As shown, the battery management system includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When the computer program is executed by the processor, it implements a battery charging method. The display unit of the battery management system is used to form a visually visible image. It can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the battery management system can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the battery management system, or external keyboards, touchpads, or mice, etc.

[0136] Those skilled in the art will understand that Figure 4 The structure shown is only a block diagram of a part of the structure related to the solution of this application, and does not constitute a limitation on the battery management system on which the solution of this application is applied. The specific battery management system may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements.

[0137] Based on the same inventive concept, embodiments of this application also provide a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, etc.

[0138] Since the computer program stored in the computer-readable storage medium can execute any of the battery charging methods provided in the embodiments of this application, the beneficial effects that any of the battery charging methods provided in the embodiments of this application can achieve can be realized, as detailed in the preceding embodiments, and will not be repeated here.

[0139] Based on the same inventive concept, embodiments of this application also provide a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. The processor of the battery management system reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the battery management system to perform the methods provided in the various optional implementations of the above embodiments.

[0140] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the methods described above.

[0141] Any reference to memory, database, or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0142] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0143] In the above embodiments of the battery charging method, battery management system, computer-readable storage medium, and computer program product, the descriptions of each embodiment have different focuses. Parts not described in detail in a particular embodiment can be referred to in the relevant descriptions of other embodiments. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes and beneficial effects of the battery charging method apparatus, computer-readable storage medium, computer program product, battery management system, and their corresponding units described above can be referred to the description of the battery charging method in the above embodiments, and will not be repeated here.

[0144] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0145] The foregoing has provided a detailed description of a battery charging method, a battery management system, a computer-readable storage medium, and a computer program product provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and its core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery charging method, characterized in that, The method includes: The charging time and percentage of charge required to fully charge a battery within a specified SOC range are obtained. The charging phase corresponding to the specified SOC range is configured to be divided into a first charging phase and at least one second charging phase. The first charging phase is configured as a fast charging phase, and the second charging phase is configured as a non-fast charging phase. Each second charging phase is configured to be divided into multiple sub-charging phases. The initial charging rate of the first charging stage is adjusted to obtain a first charging rate, and the initial charging rate of the second charging stage is adjusted to obtain a second charging rate, wherein the first charging rate is less than the initial charging rate of the first charging stage. The battery is charged using the first charging rate and the second charging rate, such that the sum of the first charging time and the second charging time is equal to the charging time. The first charging time is the time required to fully charge the first charging stage using the first charging rate, and the second charging time is the time required to fully charge the second charging stage using the second charging rate. The step of charging the battery using the second charging rate includes: charging the battery using a corresponding third charging rate in each sub-charging stage of the second charging stage; the third charging rate for each sub-charging stage is obtained by acquiring the maximum charging rate for each sub-charging stage, acquiring a safety factor for the third charging rate for each sub-charging stage, multiplying the safety factor by the maximum charging rate, and using the product as the third charging rate for each sub-charging stage; the safety factor is determined based on the internal resistance of the battery in each sub-charging stage and the relationship between the preset internal resistance and the safety factor.

2. The battery charging method according to claim 1, characterized in that, The step of adjusting the charging rate of the first charging stage to obtain the first charging rate includes: The first charging time is determined based on the charging time. Based on the stated percentage of charge, determine the first percentage of charge. The first charging rate is obtained by adjusting the charging rate of the first charging stage based on the first charging time and the first charging amount percentage.

3. The battery charging method according to claim 2, characterized in that, The step of determining the first charging time based on the charging time includes: Obtain the second charging time; The first charging time is obtained by subtracting the second charging time from the first charging time.

4. The battery charging method according to claim 3, characterized in that, Each of the second charging stages is configured to be divided into multiple sub-charging stages; The step of obtaining the second charging time includes: Obtain the third percentage of charge for each sub-charging stage; The ratio calculated by comparing the third charge percentage with the third charge rate is used as the third charging time required to fully charge each sub-charging stage. The sum of the third charging times required for all sub-charging stages is used as the total second charging time required to fully charge the second charging stage.

5. The battery charging method according to claim 2, characterized in that, The step of adjusting the charging rate of the first charging stage to obtain the first charging rate based on the first charging time and the first charging amount percentage includes: The ratio obtained by comparing the first percentage of charge amount with the first charging time is taken as the first charging rate.

6. The battery charging method according to claim 2, characterized in that, The step of determining the first charge percentage based on the charge percentage includes: Get the second percentage of charge; The difference between the first charge percentage and the second charge percentage is taken as the percentage of the first charge that is fully charged.

7. The battery charging method according to claim 6, characterized in that, Each of the second charging stages is configured to be divided into multiple sub-charging stages; The step of obtaining the second charge percentage includes: Obtain the third percentage of charge for each sub-charging stage; The second charge percentage is obtained by summing the third charge percentages of all sub-charging stages.

8. A battery management system, characterized in that, The battery management system includes: One or more processors; Memory; and One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the battery charging method of any one of claims 1 to 7.

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