Battery charging method and battery management system thereof

Abstract

The invention provides a battery charging method and a battery management system thereof. The method comprises the steps that the charging time and the charging amount percentage required by a battery to fully charge a specified SOC interval are obtained, 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 to be a fast charging stage, and the second charging stage is configured to be a non-fast charging stage; the initial charging rate of the first charging stage is adjusted to obtain a first charging rate, the initial charging rate of the second charging stage is adjusted to obtain a second charging rate, and the first charging rate is smaller 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] The present application relates to the field of battery technology, and in particular to a battery charging method and a battery management system thereof. Background Art

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

[0003] In the related art, in order to meet the user's demand for charging speed, the battery system needs to charge enough electricity in a short period of time, which puts high requirements on the overcurrent and heat dissipation of the battery system, resulting in an increase in the cost of the battery system. Summary of the invention

[0004] The present application provides a battery charging method and a battery management system thereof, aiming to reduce the cost of the battery system by optimizing the battery charging method.

[0005] In one aspect, the present application provides a battery charging method, the method comprising:

[0006] Obtaining the charging time and charging amount 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;

[0007] 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;

[0008] The battery is charged using the first charging rate and the second charging rate so that the sum of a first charging time and a 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.

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

[0010] Determining the first charging time according to the charging time;

[0011] Determining the first charging amount percentage according to the charging amount percentage;

[0012] According to the first charging time and the first charging amount percentage, the charging rate of the first charging stage is adjusted to obtain a first charging rate.

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

[0014] Obtaining the second charging time;

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

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

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

[0018] Obtaining the third charging rate of each sub-charging stage;

[0019] Obtaining a third charging capacity percentage of each sub-charging stage;

[0020] Compare the third charging capacity percentage with the third charging rate, and calculate the ratio as the third charging time required to fully charge each sub-charging stage;

[0021] The third charging times required for all the sub-charging stages are added together, and the calculated sum is used as the total second charging time required to fully charge all the second charging stages.

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

[0023] Obtain the limit charging rate of each sub-charging stage;

[0024] Obtaining a safety factor of the third charging rate in each sub-charging stage;

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

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

[0027] In each sub-charging stage in 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 according to the first charging time and the first charging amount percentage includes:

[0029] The first charging amount percentage is compared with the first charging time, and the obtained ratio is used as the first charging rate.

[0030] In one embodiment, the step of determining the first charging capacity percentage according to the charging capacity percentage includes:

[0031] Obtaining the second charging amount percentage;

[0032] The charge capacity percentage is subtracted from the second charge capacity percentage, and the difference is used as the first charge capacity percentage for fully charging.

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

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

[0035] Obtaining a third charging capacity percentage of each sub-charging stage;

[0036] The third charging capacity percentages of all sub-charging stages are added together to obtain the second charging capacity percentage.

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

[0038] one or more processors;

[0039] Memory; and

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

[0041] On the other hand, the present application also provides a computer-readable storage medium on which a computer program is stored. The computer program is loaded by a processor to execute the steps in the battery charging method.

[0042] On the other hand, an embodiment of the present application further provides a computer program product, including a computer program or instructions, and the steps in the battery charging method when the computer program or instructions are executed by a processor.

[0043] In an embodiment of the present application, a specified SOC interval is divided into a first charging stage and at least one second charging stage, wherein the first charging stage is configured as a fast charging stage and the second charging stage is configured as a non-fast charging stage, and 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, wherein the first charging rate is less than the initial charging rate of the first charging stage, 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 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, thereby ensuring that the initial charging rate of the battery in the actual charging process, that is, the maximum charging rate, is reduced while the overall charging time remains unchanged, thereby reducing the overcurrent and heat dissipation requirements for the battery system, reducing the design cost of the battery system, and further reducing the cost of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 is a schematic flow chart of an embodiment of a battery charging method provided in an embodiment of the present application;

[0046] Figure 2 is a schematic flow chart of another embodiment of the battery charging method provided in the embodiments of the present application;

[0047] Figure 3 is a schematic diagram of the SOC-charging rate curve of the battery provided in the embodiment of the present application at different charging stages;

[0048] Figure 4 It is a schematic diagram of the structure of an embodiment of a battery management system provided in the embodiments of the present application. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0050] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0051] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0052] In order to meet the user's demand for charging speed, the battery system in the related art needs to charge enough electricity in a short time, so high requirements are placed on the overcurrent and heat dissipation of the battery system, resulting in an increase in the cost of the battery system. Therefore, an embodiment of the present application provides a battery charging method and a battery management system thereof, which divides a specified SOC interval into a first charging stage and at least one second charging stage, wherein the first charging stage is configured as a fast charging stage, and the second charging stage is configured as a non-fast charging stage, and then balances the initial charging rate of the first charging stage and the initial charging rate of the second charging stage to obtain corresponding first charging rate and second charging rate, respectively, wherein the first charging rate is less than the second charging rate. The battery is charged at an initial charging rate of a charging stage, and then the first charging rate and the second charging rate are used to charge the battery so 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, thereby ensuring that the initial charging rate of the battery in the actual charging process, that is, the maximum charging rate, is reduced while the overall charging time remains unchanged, thereby reducing the overcurrent and heat dissipation requirements of the battery system, reducing the design cost of the battery system, and further reducing the cost of the battery system. For specific solutions, please refer to the following specific description.

[0053] Next, a battery charging method provided in an embodiment of the present application is introduced.

[0054] In the embodiment of the battery charging method of the embodiment of the present application, a battery management system is used as an execution subject. For the sake of simplicity and ease of description, the execution subject will be omitted in the subsequent method embodiments. The method includes: obtaining the charging time and charging amount percentage required for the battery to fully charge 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 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 so 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 the present application is described in detail below with reference to the accompanying drawings. Although the present 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 routine or no creative labor. In the steps where there is no necessary causal relationship logically, the execution order of these steps is not limited to the execution order provided in the embodiments of the present application. When the method is executed in the actual object processing process or when the device is executed, it can be executed in the order of the method shown in the embodiments or drawings or in parallel (for example, in a parallel processor or multi-threaded processing environment).

[0056] See also Figures 1 to 3 , Figure 1 This is a flow chart of an embodiment of a battery charging method provided in an embodiment of the present application. The battery charging method includes steps 201 to 205:

[0057] 201. Obtain the charging time and charging percentage required for the battery to fully charge 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.

[0058] In this embodiment, the SOC (State of Charge) of the battery refers to the percentage of the current remaining capacity of the battery to the total capacity of the battery in a fully charged state. This parameter is used to indicate the charge level or remaining capacity of the battery, usually expressed as a percentage.

[0059] Specifically, the calculation formula of SOC is:

[0060] SOC=Q_remain / Q_rated×100%;

[0061] Among them, 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 designated SOC interval is pre-divided, and the corresponding charging percentage 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 interval.

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

[0064] Among them, during the entire charging process of the battery, the charging rate corresponding to the fast charging stage is the maximum charging rate. The present application is to reduce the maximum charging rate of the battery to reduce the overcurrent and temperature of the battery when charging at the maximum charging rate during the charging process, thereby reducing the overcurrent peak and high temperature peak in the entire charging process, thereby reducing the overcurrent and heat dissipation requirements of the battery system, and further reducing the design cost of the battery system.

[0065] The at least one second charging stage may be one, two or more than two. However, no matter how many there are, the first charging stage and the at least one second charging stage are integrally connected to each other.

[0066] In a specific embodiment, if 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 a terminal current reduction stage.

[0067] Among them, the pre-charge stage is the pre-charge stage before charging, and the charging rate in the pre-charge stage gradually increases; the charging rate k in the fast charge stage m is the maximum charging rate during the charging process; the fast charging current reduction stage is the charging stage where the charging rate is reduced after fast charging, and its charging rate gradually decreases; the terminal current reduction stage is the low-rate charging stage where the battery is nearly fully charged; the charging rates in 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 the process, each charging stage is divided into multiple sub-charging stages, and the actual charging rate k in each sub-stage is less than the limit charging rate k. / , wherein the limit charging rate is the boundary charging rate at which lithium plating failure occurs during charging, and 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, the target charging stage also belongs to the charging stage in "fast charging". The "fast charging" is different from the "slow charging". Generally speaking, the main difference between "fast charging" and "slow charging" is the charging method, that is, "fast charging" is a DC charging method, and "slow charging" is an AC charging method.

[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] Among them, during the entire first charging stage, the charging rate can be constant. For example, the first charging stage is 10% to 65% SOC, then at 10%, 15%, 25%, 65% or any one of the SOCs, the corresponding charging rate is the same.

[0072] In addition, the initial charging rate of the first charging stage is characterized as the initial charging rate determined before the current charging, and the first charging rate is the charging rate after adjustment.

[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 in each second charging stage in at least one of the second charging stages to obtain its corresponding second charging rate.

[0074] The second charging rate refers to the average charging rate of all second charging stages. As described below, each second charging stage is further divided into a plurality of sub-charging stages.

[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 in at least one target second charging stage in at least one of the second charging stages to obtain its corresponding second charging rate.

[0076] In some embodiments, Figure 2 As shown, the step of adjusting the charging rate in the first charging stage to obtain the first charging rate may specifically include steps 221 to 223:

[0077] 2021. Determine the first charging time according to 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 charging time from the second charging time to obtain the first charging time.

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

[0080] The step of obtaining the second charging time includes: obtaining the third charging ratio of each sub-charging stage; obtaining the third charging amount percentage of each sub-charging stage; comparing the third charging amount percentage with the third charging ratio, 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 of each sub-charging stage includes: obtaining the limit charging rate of each sub-charging stage; obtaining the safety factor of the third charging rate of each sub-charging stage; multiplying the safety factor by the limit charging rate, and using the product as the third charging rate of each sub-charging stage.

[0082] As mentioned above, the limit charging rate is the boundary charging rate at which lithium plating failure occurs during charging, and 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 is the safety factor of each sub-charging stage, satisfying 0≤a n <1, where, like the limit charging rate, the safety factor may also be a preset parameter, which may be obtained from a preset target storage object.

[0084] In one embodiment, the step of obtaining the safety factor of the third charging rate of 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 of each sub-charging stage based on the internal resistance and the relationship between the preset internal resistance and the safety factor.

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

[0086] In a specific embodiment, the setting is performed according to the relationship between the internal resistance value at the current SOC stage and the average internal resistance R of 0% SOC to 100% SOC. If the internal resistance of the battery cell at the current SOC stage is greater than the average internal resistance R of 0% SOC to 100% SOC, the value is 0.7; if the internal resistance of the battery cell at the current SOC stage is less than or equal to the average internal resistance R of 0% SOC to 100% SOC, the value is 0.8; when a n When it is 0, it means there is no such stage.

[0087] 2022. Determine the first charging capacity percentage according to the charging capacity 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 obtaining the difference as the first charge percentage for fully charging.

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

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

[0091] In some embodiments, obtaining the third charging capacity percentage of each sub-charging stage may include: obtaining the internal resistance of the battery corresponding to different charging stages, and determining the third charging capacity percentage of 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 may also be a preset value, that is, measured in advance and stored in the target storage object.

[0093] The third charging percentage of each sub-charging stage can be divided according to the internal resistance of the battery. Specifically, △SOC1, △SOC2, △SOC3, ... △SOC m-1 , △SOC m+1 …△SOC n-1 , △SOC n It is the third charge percentage corresponding to each sub-charging stage. It can be divided according to the difference in internal resistance of the battery cell. For example, if the difference between the internal resistance of the current SOC interval and the internal resistance of the next SOC interval is ≥10%, then one SOC interval is divided. For example, the internal resistance of the 0%~5% SOC interval is 1.1R, and the internal resistance of the 5%~10% SOC interval is R. The internal resistance difference is 0.1R, ≥10%, then it is divided into two SOC intervals: △SOC1 (0%~5%), △SOC2 (5%~10%), and so on.

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

[0095] In some embodiments, the step of adjusting the charging rate of the first charging stage to obtain a 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 obtaining a ratio as the first charging rate.

[0096] In order to facilitate the understanding of the above data processing process, the specific calculation process is provided below:

[0097] Assume the first charging time is t m , t m It can be calculated by the following formula (1):

[0098]

[0099] The first charge percentage is △SOC m , △SOC m It can be calculated by 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 by 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 / is the limit charging rate. The actual charging rate k in each sub-stage is less than the limit charging rate k / .

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

[0107] 203. Charge the battery using the first charging rate and the second charging rate so that the sum of a first charging time and a 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] Wherein, fully completing the second charging stage refers to fully completing all the second charging stages in at least one second charging stage.

[0109] The battery SOC (State of Charge) is divided into multiple charging stages, which means that during the battery charging process, different charging stages are divided according to different SOC intervals. 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 SOC reaches a certain value, it enters the next charging stage. For example, if a battery is divided into four stages, each stage interval is 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 division helps to better control the charging process, ensuring that the battery receives the appropriate charging current and voltage at different stages, thereby improving charging efficiency and safety. In addition, this multi-stage charging strategy can also optimize the performance and life of the battery 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 in the second charging stage.

[0113] In a 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 stage corresponds to the 0% to 10% SOC range:

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

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

[0119] ①65%~70% SOC range:

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

[0121] ②70%~75% SOC range:

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

[0123] ③75%~80% SOC range:

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

[0125]

[0126] ⑶Fast charging stage:

[0127] The fast charging stage corresponds to the 10% to 65% SOC range:

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

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

[0130] Charging rate k2 = △SOC2 / t2 = 2.13 < k / 2=3.

[0131] In an embodiment of the present application, a designated SOC interval is divided into a first charging stage and at least one second charging stage, wherein the first charging stage is configured as a fast charging stage and the second charging stage is configured as a non-fast charging stage, and 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, wherein the first charging rate is less than the initial charging rate of the first charging stage, 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 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, thereby ensuring that the initial charging rate of the battery in the actual charging process, that is, the maximum charging rate, is reduced while the overall charging time remains unchanged, thereby reducing the overcurrent and heat dissipation requirements for the battery system, reducing the design cost of the battery system, and further reducing the cost of the battery system.

[0132] Based on the same inventive concept, the embodiment of the present application also provides a battery management system, which can be a server or a terminal device, and the battery management system includes a memory and a processor, and a computer program is stored in the memory, and the processor implements the steps of the above-mentioned battery charging method when executing the computer program. Thereby, various functions are realized, such as: obtaining the charging time and charging amount percentage required for the battery to fill 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 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 so 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 fill the first charging stage using the first charging rate, and the second charging time is the time required to fill the second charging stage using the second charging rate.

[0133] The battery management system provided in the embodiment of the present application divides the designated SOC interval into a first charging stage and at least one second charging stage, wherein the first charging stage is configured as a fast charging stage and the second charging stage is configured as a non-fast charging stage, and then balances the initial charging rate of the first charging stage and the initial charging rate of the second charging stage to obtain the corresponding first charging rate and second charging rate, respectively, wherein the first charging rate is less than the initial charging rate of the first charging stage, and then charges the battery 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, 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, thereby ensuring that the initial charging rate of the battery in the actual charging process, that is, the maximum charging rate, is reduced while the overall charging time remains unchanged, thereby reducing the overcurrent and heat dissipation requirements for the battery system, reducing the design cost of the battery system, and further reducing the cost of the battery system.

[0134] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0135] In one embodiment, the battery management system is an example of a terminal device, and its internal structure diagram can be as follows: Figure 4 As shown. The battery management system includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. Among them, the processor of the battery management system is used to provide computing and control capabilities. The memory of the battery management system includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the battery management system is used to exchange information between the processor and an external device. The communication interface of the battery management system is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a battery charging method is implemented. The display unit of the battery management system is used to form a visually visible image, and can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen. The input device of the battery management system can be a touch layer covered on the display screen, or it can be a button, trackball or touchpad set on the battery management system housing, or it can be an external keyboard, touchpad or mouse, etc.

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

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

[0138] Since the computer program stored in the computer-readable storage medium can execute any one of the battery charging methods provided in the embodiments of the present application, the beneficial effects that can be achieved by any one of the battery charging methods provided in the embodiments of the present application can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0139] Based on the same inventive concept, the embodiment of the present application further provides a computer program product or a computer program, which includes a computer instruction stored in a computer-readable storage medium. The processor of the battery management system reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the battery management system executes the method provided in various optional implementations in the above embodiments.

[0140] A person skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing related hardware through a computer program. 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 above-mentioned methods.

[0141] Any reference to the memory, database or other media used in the embodiments provided in the present 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 (Re RAM), 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. As an 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 database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0143] In the above-mentioned battery charging method, battery management system, computer-readable storage medium, and computer program product embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process and beneficial effects of the battery charging method device, computer-readable storage medium, computer program product, battery management system and its corresponding units described above can refer to the description of the battery charging method in the above embodiment, and will not be repeated here.

[0144] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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 above is a detailed introduction to a battery charging method, a battery management system, a computer-readable storage medium and a computer program product provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery charging method, characterized in that: The method comprises: Obtaining the charging time and charging amount 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 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; The battery is charged using the first charging rate and the second charging rate so that the sum of a first charging time and a 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.

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 a first charging rate includes: Determining the first charging time according to the charging time; Determining the first charging amount percentage according to the charging amount percentage; According to the first charging time and the first charging amount percentage, the charging rate of the first charging stage is adjusted to obtain a first charging rate.

3. The battery charging method according to claim 2, characterized in that: The step of determining the first charging time according to the charging time includes: Obtaining the second charging time; The first charging time is obtained by subtracting the charging time from the second 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 a plurality of sub-charging stages; The step of obtaining the second charging time includes: Obtaining the third charging rate of each sub-charging stage; Obtaining a third charging capacity percentage of each sub-charging stage; Compare the third charging capacity percentage with the third charging rate, and calculate the ratio as the third charging time required to fully charge each sub-charging stage; The third charging times required for all the sub-charging stages are added together, and the calculated sum is used as the total second charging time required to fully charge all the second charging stages.

5. The battery charging method according to claim 4, characterized in that: The step of obtaining the third charging rate of each sub-charging stage includes: Obtain the limit charging rate of each sub-charging stage; Obtaining a safety factor of the third charging rate in each sub-charging stage; The safety factor is multiplied by the limit charging rate, and the obtained product is used as the third charging rate of each sub-charging stage.

6. The battery charging method according to claim 5, characterized in that: The step of charging the battery using the second charging rate includes: In each sub-charging stage in the second charging stage, the battery is charged using the corresponding third charging rate.

7. 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 a first charging rate according to the first charging time and the first charging amount percentage includes: The first charging amount percentage is compared with the first charging time, and the obtained ratio is used as the first charging rate.

8. The battery charging method according to claim 2, characterized in that: The step of determining the first charging capacity percentage according to the charging capacity percentage comprises: Obtaining the second charging amount percentage; The charge capacity percentage is subtracted from the second charge capacity percentage, and the difference is used as the first charge capacity percentage for fully charging.

9. The battery charging method according to claim 8, characterized in that: Each of the second charging stages is configured to be divided into a plurality of sub-charging stages; The step of obtaining the second charging capacity percentage includes: Obtaining a third charging capacity percentage of each sub-charging stage; The third charging capacity percentages of all sub-charging stages are added together to obtain the second charging capacity percentage.

10. A battery management system, characterized in that: The battery management system comprises: one or more processors; Memory; and One or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor to implement the battery charging method according to any one of claims 1 to 9.

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