Battery capacity loss analysis method and electronic controller

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a battery capacity loss analysis method and an electronic controller, and the method comprises the steps: starting to guide a battery to use electricity for the first time when the service time of the battery exceeds a preset number of days, and carrying out small-current charging until the electric quantity of the battery is lower than a preset electric quantity threshold value; obtaining the charging electric quantity of the battery in each charging stage, and recording the charging electric quantity as first comparison electric quantity; continuing to guide the battery to use electricity for the second time until the electric quantity of the battery is lower than the preset electric quantity threshold value again, performing normal charging, acquiring the charging electric quantity of the battery in each charging stage, and recording the charging electric quantity as a second comparison electric quantity; calculating a first attenuation value of low-current charging according to the ratio of the first initial electric quantity to the first comparison electric quantity in the same charging stage, and calculating a second attenuation value of normal charging according to the ratio of the second initial electric quantity to the second comparison electric quantity in the same charging stage, and identifying the capacity loss and the power loss of the battery according to the first attenuation value and the second attenuation value.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a battery capacity loss analysis method and an electronic controller. Background Art

[0002] The rapid development of the new energy vehicle field has driven the research of power batteries. The parameters that users are most concerned about for new energy vehicles are cruising range, lifespan, charging speed, low temperature performance, etc., and the above parameters are all related to the performance of power batteries. Among them, cruising range is one of the parameters that users are most concerned about. Many car owners complain that the cruising range is significantly reduced after using the battery for a period of time. To a certain extent, battery capacity decay can be used to indicate the health status of the battery.

[0003] The battery capacity attenuation shown by power batteries can generally be divided into two types, capacity loss (CL) and power loss (PL). CL is the capacity attenuation caused by the side reactions in the battery during the charge and discharge process, which consumes active lithium, damages the material structure or decomposes the electrolyte, and reduces the reversible lithium in the entire system. PL is due to the existence of battery polarization voltage, which is affected by aging degree, current, etc. For example, the higher the battery aging degree, the greater the polarization voltage, or the greater the charge and discharge current of the battery, the greater the polarization voltage. Among them, CL is irreversible under any conditions, while PL is reversible by controlling the battery operation.

[0004] Therefore, it is necessary to design a method to identify the source of battery capacity attenuation and guide the use of the battery. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method for analyzing battery capacity loss, which can calculate and analyze the source of battery capacity attenuation online without adding additional hardware costs, and thus remind users to optimize battery usage.

[0006] To achieve the above-mentioned purpose and other related purposes, the present invention provides a method for analyzing battery power loss, comprising: when the battery usage time exceeds a preset number of days, starting to guide the battery to use electricity for the first time, until the battery power is lower than a preset power threshold, then charging with a small current, and obtaining the charging power of the battery in each charging stage, recorded as a first comparison power; and continuing to guide the battery to use electricity for the second time, until the battery power is lower than the preset power threshold again, then charging normally, and obtaining the charging power of the battery in each charging stage, recorded as a second comparison power; calculating a first attenuation value for small current charging according to the ratio of the first initial power to the first comparison power in the same charging stage, and calculating a second attenuation value for normal charging according to the ratio of the second initial power to the second comparison power in the same charging stage, and identifying the capacity loss and power loss of the battery based on the first attenuation value and the second attenuation value.

[0007] According to a specific embodiment of the present invention, the steps of obtaining the first initial power and the second initial power include: when the battery leaves the factory or is used for the first time, starting to guide the battery to use power for the first time, and charging with a small current is performed after the battery power is lower than a preset power threshold, and obtaining the charging power of the battery in each charging stage, which is recorded as the first initial power; and continuing to guide the battery to use power for the second time, and charging normally is performed after the battery power is lower than the preset power threshold again, and obtaining the charging power of the battery in each charging stage, which is recorded as the second initial power.

[0008] According to a specific embodiment of the present invention, the charging stages of the battery are divided according to their corresponding charging MAPs.

[0009] According to a specific embodiment of the present invention, the step of obtaining the charging capacity of the battery in each charging stage also includes: screening the charging capacity in each charging stage, and recording the screened charging capacity as the first initial capacity / second initial capacity / first comparison capacity / second comparison capacity.

[0010] According to a specific embodiment of the present invention, the step of screening the charging capacity of each charging stage includes: for each charging stage, obtaining the temperature change of the battery in the current charging stage, and calculating the average of the temperature change; discarding the charging capacity corresponding to the mean value lower than the preset temperature threshold.

[0011] According to a specific embodiment of the present invention, the step of screening the charging quantity in each charging stage further includes: for each charging stage, discarding the charging quantity corresponding to the battery not fully experiencing the current charging stage.

[0012] According to a specific embodiment of the present invention, the step of calculating the first attenuation value of low-current charging based on the ratio of the first initial power to the first comparison power in the same charging stage includes: for each charging stage, identifying whether the first initial power in the current charging stage has a corresponding first comparison power: if so, calculating the ratio of the first initial power to its corresponding first comparison power; if not, discarding the first initial power; calculating the average of all ratios and using it as the first attenuation value.

[0013] According to a specific embodiment of the present invention, the step of calculating the second attenuation value of normal charging based on the ratio of the second initial power to the second comparison power in the same charging stage includes: for each charging stage, identifying whether the second initial power in the current charging stage has a corresponding second comparison power: if so, calculating the ratio of the second initial power to its corresponding second comparison power; if not, discarding the second initial power; calculating the average of all ratios and using it as the second attenuation value.

[0014] According to a specific embodiment of the present invention, the number of the ratios is at least greater than half of the number of battery charging stages.

[0015] According to a specific embodiment of the present invention, the step of identifying the capacity loss and power loss of the battery based on the first attenuation value and the second attenuation value includes: taking the difference between the first attenuation value and the second attenuation value as the power loss of the battery, and taking the difference between the first attenuation value and 1 as the capacity loss of the battery.

[0016] According to a specific embodiment of the present invention, it also includes: based on the capacity loss and power loss of the battery, when its capacity loss exceeds a preset first percentage, it is recommended that the user replace the battery; when its power loss exceeds a preset second percentage, it is recommended that the user reduce the use of high-power batteries.

[0017] An electronic controller is used to execute the above-mentioned battery power loss analysis method.

[0018] The present invention provides a method for identifying the source of battery capacity attenuation. By comparing the difference in charging capacity of the battery under low-current charging and normal charging, the capacity loss and power loss of the battery can be identified online, and then the use of the battery can be optimized according to the capacity loss and power loss to avoid rapid aging of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic flow chart of a specific embodiment of a method for analyzing battery capacity loss provided by the present invention;

[0020] Figure 2 It is a schematic diagram of a specific embodiment of a battery charging MAP provided by the present invention;

[0021] Figure 3 A schematic structural diagram of a specific embodiment of a battery capacity loss analysis system provided by the present invention;

[0022] Figure 4 The present invention provides a structural block diagram of a specific embodiment of an electronic controller. DETAILED DESCRIPTION

[0023] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0025] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0026] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0027] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0028] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0029] Example 1

[0030] See also Figure 1 As shown, a method for analyzing battery capacity loss includes:

[0031] Step S100, when the battery usage time exceeds a preset number of days, start guiding the battery to use electricity for the first time, and perform low-current charging after the battery power is lower than a preset power threshold, and obtain the charging power of the battery in each charging stage, which is recorded as the first comparison power; and continue to guide the battery to use electricity for the second time, and perform normal charging after the battery power is lower than the preset power threshold again, and obtain the charging power of the battery in each charging stage, which is recorded as the second comparison power.

[0032] It is understandable that after a period of use of the battery, such as the power battery on a new energy vehicle, when the vehicle has a large mileage, for example, the vehicle has traveled more than 5,000 kilometers, or the vehicle has been used for a long time, for example, the vehicle has been used for half a year or a year since it was purchased. Therefore, as the battery is continuously used and the number of charge and discharge cycles increases, the battery capacity is prone to decay, affecting its service life. At present, the estimation of the battery health status is mainly through cell testing to obtain the cycle (charge and discharge) capacity, as well as the MAP relationship between calendar time and health status, and record the cumulative charge and discharge capacity and calendar time of the battery during its life cycle, and finally obtain the battery health status through cycle aging and calendar aging weighting, but the above method cannot distinguish the source of battery capacity decay.

[0033] In this embodiment, in order to identify the source of battery capacity attenuation and optimize battery use, the battery charge capacity change is detected by low current charging and normal charging. Preferably, after the battery has been used for a period of time, it can be suggested to the user to analyze the source of battery capacity attenuation to optimize battery use. The corresponding method can be that the battery usage time meets the preset number of days. Of course, in other different embodiments, it can also be suggested to the user after the battery charge / discharge times meet a certain number of times, or the power battery on the new energy vehicle can be suggested to the user after the new energy vehicle has traveled a certain mileage. There is no excessive restriction on this. The modifications and embellishments made to the embodiments of the present invention by those skilled in the art without departing from the spirit of the present invention still fall within the scope of the invention application of the present invention.

[0034] Specifically, in actual applications, for example, when the battery usage time exceeds a preset number of days, the user can be advised to use a low current for the next charge, and begin to guide the battery's first use of electricity. It can be understood here that battery charging is usually an active behavior of the user, so the battery can be charged at different levels of power. In this regard, in order to fully compare the charge and discharge data before and after the battery is used, and then analyze the source of its capacity attenuation, it is necessary to control the battery's power level to remain as consistent as possible each time it is charged.

[0035] Therefore, it is necessary to guide the battery to use electricity for the first time, until the battery power is lower than the preset power threshold, for example, it can be less than 15%, and request the user to charge the vehicle with a small current until the power battery is charged to the full charge cut-off voltage. At the same time, it is necessary to obtain the charging power of the power battery at each charging stage to identify the source of the power battery capacity loss through the changes before and after the charging power.

[0036] It should be added here that the charging stages of the power battery are divided according to their corresponding charging MAP, and the battery charging MAP reflects the charging characteristics of the battery under different conditions, and the charging current and charging power of the battery are formulated accordingly. For example, see Figure 2 The charging MAP of the battery DC fast charge shown is divided into 12 charging stages according to the charging voltage of the battery cell, and the voltage and charging current of each charging stage are adjusted accordingly with the change of temperature. Therefore, in this embodiment, the charging power corresponding to each charging stage can be obtained according to the charging MAP of the battery itself, and recorded as the first comparison power.

[0037] It should also be added that the charging power can be obtained by calculating the voltage before and after the charging stage and the charging current using the ampere-hour integration method and the voltage integration method. This will not be described in detail, as it is a technical means well known to those skilled in the art. In addition, the small current charging mentioned in this embodiment can be, for example, charging the battery with a charging current of 0.1C in each charging stage. Of course, the charging current is not limited to 0.1C and can be adjusted according to the charging characteristics and requirements of the battery. Without departing from the spirit of the present invention, the modifications and embellishments made to the embodiments of the present invention by those skilled in the art still fall within the scope of the invention application of the present invention.

[0038] Of course, it is also understandable that the above-mentioned charging behavior still needs to be executed after obtaining the user's consent. If low-current charging is not possible due to other special circumstances, the action of analyzing the source of battery capacity attenuation will be adjusted to other times and executed accordingly after obtaining the user's consent.

[0039] Furthermore, when the battery has been charged with a low current and charged to the full charge cut-off voltage, the battery can continue to be used for the second time until the battery power is again lower than the preset power threshold, such as 15%, and the user is requested to charge the vehicle normally until the power battery is charged to the full charge cut-off voltage. It is also necessary to obtain the charging power of the power battery at each charging stage, recorded as the second comparison power, so that it can be compared with the first initial power and the second initial power in the same charging stage, and then analyze the source of the battery capacity loss. It should be added here that the normal charging of the power battery is to be charged according to its corresponding charging MAP, and there are no excessive restrictions on this.

[0040] In addition, when analyzing the power battery of a new energy vehicle, it is preferred to power off and sleep for a period of time after the battery power is lower than the preset power threshold, and then fully charge it with a small current to avoid the battery power being empty. Of course, it can also be understood that the analysis method of battery capacity loss provided by this application is not limited to the field of new energy vehicles, and can be used for battery capacity attenuation analysis in different fields. Without departing from the spirit of the present invention, the modifications and embellishments made to the embodiments of the present invention by those skilled in the art still fall within the scope of the invention application of the present invention.

[0041] Based on the above, the first comparison power can be obtained:

[0042] Second comparison power:

[0043] Furthermore, since the performance of the battery is greatly affected by temperature, in order to ensure the accuracy of the identification of the battery's capacity loss and power loss, in this embodiment, it is necessary to ensure that the temperature of the battery during charging meets 25 degrees Celsius or above. In addition, for the reference value of data comparison, both small battery charging and normal charging must meet the above standards to ensure that data comparison can be performed under the same standard conditions.

[0044] To this end, the temperature change of each charging stage of the battery is monitored to ensure whether the first comparison power / second comparison power corresponding to the charging stage is available. Specifically, for any charging stage, the temperature change range is monitored, and the temperature mean is calculated accordingly. If the temperature mean is less than 25 degrees Celsius, it is considered that the first comparison power / second comparison power corresponding to the charging stage does not meet the standard and should be discarded. Then, the first comparison power and the second comparison power are screened according to the temperature standard. It should also be added that there is no requirement for whether the amount of the first comparison power and the amount of the second comparison power are consistent. Only the first comparison power and the second comparison power that do not meet the requirements are discarded according to the temperature standard.

[0045] In addition, since the battery power can be charged with a low current or normally charged when the battery power is lower than the preset power threshold, there is no way to ensure that the battery power is the same before each charging. For example, when the battery power is lower than 15% and low current charging is performed, the actual battery power is 13%; and when the battery power is lower than 15% and normal charging is performed, the actual battery power is 14%. Therefore, it is very easy to cause the battery to fail to complete a certain charging stage, such as reference Figure 2In the charging MAP shown, when the battery power is 13%, the battery voltage may be between the third charging stage and the fourth charging stage. If the battery is charged with a small current or charged normally at this time, the battery cannot go through a complete charging stage, thereby affecting the accuracy of the data when compared with the first initial power / second initial power in the same charging stage, and thus incorrectly analyzing the battery capacity loss and power loss. For example, the first initial power in the same charging stage is calculated after the battery has gone through a complete charging stage, that is, the battery voltage increases from the starting value of the charging stage to the end value of the charging stage, and the first initial power in the charging stage is calculated using the ampere-hour integration method and the voltage integration method. However, the first comparison power does not go through a complete charging stage, that is, the battery voltage may increase from the middle value of the charging stage to the end value of the charging stage, and the analysis is performed based on the first comparison power and the first initial power calculated, thereby affecting the accuracy of the cause of battery capacity decay.

[0046] In this regard, the voltage change of each charging stage of the battery is monitored to ensure whether the first comparison power / second comparison power corresponding to the charging stage is available, and the first comparison power / second comparison power corresponding to the incomplete charging stage is discarded. Then, the first comparison power and the second comparison power are screened by the charging power standard, that is, whether any charging stage is completely experienced. Similarly, there is no requirement for whether the amount of the first comparison power and the amount of the second comparison power are consistent.

[0047] Based on the above, after screening, the first comparison power and the second comparison power that can be used to compare with the first initial power and the second initial power can be obtained. It should also be noted here that the first initial power and the second initial power can be calculated according to the above method when the battery leaves the factory, and the data is marked on the battery or its packaging, or it can be calculated according to the above method when the user uses the battery for the first time. In this regard, in this embodiment, for example, the power battery on a new energy vehicle can be guided to use electricity for the first time after the user has just picked up the car, until the vehicle power battery is charged with a small current when the power is less than 15%, and the charging power of the power battery in each charging stage is obtained, which is recorded as the first initial power; and after the power battery is charged with a small current, continue to guide the power battery to use electricity for the second time, until the power of the vehicle power battery is again less than 15% for normal charging, and obtain the charging power of the power battery in each charging stage, which is recorded as the second initial power, and the first initial power that can be used for before and after comparison can be obtained: And the second initial charge: Of course, it is also necessary to screen the first initial power and the second initial power according to the above-mentioned temperature standard and charging power standard to filter out parameters that do not meet the requirements, which will not be described in detail.

[0048] Step S200, calculating a first attenuation value for low-current charging according to a ratio of a first initial charge to a first comparison charge in the same charging stage, and calculating a second attenuation value for normal charging according to a ratio of a second initial charge to a second comparison charge in the same charging stage, and identifying the capacity loss and power loss of the battery based on the first attenuation value and the second attenuation value.

[0049] Based on the first initial power, the second initial power, the first comparison power, and the second comparison power obtained above, the first initial power and the first comparison power in the same charging stage can be calculated and analyzed, as well as the second initial power and the second comparison power in the same charging stage can be calculated and analyzed, thereby obtaining the capacity loss and power loss of the battery. It should also be noted here that since the first initial power, the second initial power, the first comparison power, and the second comparison power are screened and filtered respectively, the quantities of the first initial power, the second initial power, the first comparison power, and the second comparison power are correspondingly different, that is, the first initial power and the first comparison power may include charging powers in different charging stages, and the second initial power and the second comparison power may include charging powers in different charging stages.

[0050] In order to be able to correspond one-to-one with the first initial power and the first comparison power, as well as the second initial power and the second comparison power, for each charging stage, it is identified whether the first initial power in the current charging stage has a corresponding first comparison power: if so, the ratio of the first initial power to the first comparison power in the charging stage is calculated; if not, the first initial power in the charging stage is discarded. Correspondingly, the ratios corresponding to multiple different charging stages can be calculated, and the average of all ratios is calculated as the first attenuation value. For details, please refer to the following formula:

[0051]

[0052] Wherein, X represents the ratio of the first initial power to the first comparison power, and L1 represents the first attenuation value. It should also be added that, This is only an example of the first comparison power after screening, and X is the amount of the first comparison power. In actual applications, it is only necessary to calculate the first attenuation value according to the above method.

[0053] Similarly, for each charging stage, identify whether the second initial power in the current charging stage has a corresponding second comparison power: if so, calculate the ratio of the second initial power in the charging stage to the second comparison power; if not, discard the second initial power in the charging stage. Correspondingly, the ratios corresponding to multiple different charging stages can be calculated, and the average of all ratios is calculated as the second attenuation value. For details, refer to the following formula:

[0054]

[0055] Wherein, Y represents the ratio of the second initial power to the second comparison power, and L2 represents the second attenuation value. b2 , This is only an example to illustrate the second comparison power after screening, and Y is the amount of the second comparison power. In actual applications, it is only necessary to calculate the second attenuation value according to the above method.

[0056] It should also be noted that, preferably, X and Y need to exceed half of the number of charging stages to ensure that the subsequent calculation of the battery capacity loss and power loss is more accurate. Figure 2 The charging MAP shown includes 12 charging stages, and the corresponding X and Y need to be at least greater than 6. If this condition cannot be met, the first comparison power and the second comparison power can be re-obtained accordingly, that is, the battery is charged with a small current and charged normally again according to the above method, and the first comparison power and the second comparison power are re-obtained and screened, and the first attenuation value and the second attenuation value are recalculated according to the above steps accordingly.

[0057] It should also be added that the first initial power and the second initial power discarded in the above steps only mean that they are not used for this calculation and analysis, but can be stored in the memory of the electronic device so that the first initial power and the second initial power can continue to be used to analyze the source of battery capacity attenuation in the future.

[0058] Furthermore, according to the above calculations, L1 and L2 are obtained to analyze the capacity loss and power loss of the battery. The specific reference is as follows:

[0059] PL=L1-L2,CL=1-L1,

[0060] Based on the calculated capacity loss CL and power loss PL, the source of battery capacity attenuation can be analyzed. For example, if PL is 3% and CL is 3%, it means that part of the battery capacity attenuation comes from capacity loss CL and part from power loss PL. Furthermore, the use of the battery can be optimized based on the capacity loss CL and power loss PL. For example, when the proportion of PL is too high, higher than 30%, users can be advised to reduce the use of high power, such as rapid acceleration of new energy vehicles, etc., to maintain stable output and improve overall endurance. When the proportion of CL is too high, higher than 50%, it means that the battery capacity attenuation is almost irreversible, there is no way to optimize the battery capacity, and the battery needs to be replaced to ensure the personal safety of the user.

[0061] Of course, it can be understood that the above-mentioned first percentage of 50% and the second percentage of 30% can be freely adjusted. This embodiment is only an example for reference. Those skilled in the art can make modifications and improvements to the embodiments of the present invention without departing from the spirit of the present invention. They still fall within the scope of the invention application of the present invention.

[0062] It should be noted that the step division of the above methods is only for clear description. When implemented, they can be combined into one step or some steps can be split and decomposed into multiple steps. As long as they contain the same logical relationship, they are all within the scope of protection of this patent; adding insignificant modifications to the algorithm or process or introducing insignificant designs without changing the core design of the algorithm and process are all within the scope of protection of this patent.

[0063] Example 2

[0064] See also Figure 3 As shown, the embodiment of the present application also provides a battery capacity loss analysis system, including:

[0065] The data acquisition module is used to guide the battery to use electricity for the first time when the battery usage time exceeds a preset number of days, and to charge the battery with a small current after the battery power is lower than a preset power threshold, and obtain the charging power of the battery in each charging stage, which is recorded as the first comparison power; and to continue to guide the battery to use electricity for the second time, and to charge the battery normally after the battery power is lower than the preset power threshold again, and obtain the charging power of the battery in each charging stage, which is recorded as the second comparison power.

[0066] A data analysis module is used to calculate a first attenuation value for low-current charging according to a ratio of a first initial charge to a first comparison charge in the same charging stage, and to calculate a second attenuation value for normal charging according to a ratio of a second initial charge to a second comparison charge in the same charging stage, and to identify the capacity loss and power loss of the battery based on the first attenuation value and the second attenuation value.

[0067] It should be noted that the battery capacity loss analysis system provided in the above embodiment and the battery capacity loss analysis method provided in the above embodiment 1 belong to the same concept, wherein the specific manner in which each module and unit performs the operation has been described in detail in the method embodiment, and will not be repeated here. In practical applications, the battery capacity loss analysis method provided in the above embodiment 1 can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above, and this is not limited here.

[0068] Example 3

[0069] An embodiment of the present application also provides an electronic controller, including a memory 2, a processor 1, and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the battery capacity loss analysis method described in any one of the above items are implemented.

[0070] In summary, the present invention provides a method for identifying the source of battery capacity attenuation. By comparing the difference in charging capacity between the battery under low-current charging and normal charging, the capacity loss and power loss of the battery can be identified online, and then the use of the battery can be optimized according to the capacity loss and power loss to avoid rapid aging of the battery.

[0071] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

[0072] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0073] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0074] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for analyzing battery capacity loss, characterized in that: include: When the battery usage time exceeds the preset number of days, the battery is guided to use electricity for the first time, and low-current charging is performed until the battery power is lower than the preset power threshold, and the charging power of the battery in each charging stage is obtained, which is recorded as the first comparison power; and the battery is guided to use electricity for the second time, and the battery power is lower than the preset power threshold again, and normal charging is performed, and the charging power of the battery in each charging stage is obtained, which is recorded as the second comparison power; A first attenuation value for low-current charging is calculated based on the ratio of a first initial charge to a first comparison charge in the same charging stage, and a second attenuation value for normal charging is calculated based on the ratio of a second initial charge to a second comparison charge in the same charging stage, and the capacity loss and power loss of the battery are identified based on the first attenuation value and the second attenuation value.

2. The method for analyzing battery capacity loss according to claim 1, characterized in that: The steps of obtaining the first initial power and the second initial power include: When the battery leaves the factory or is used for the first time, the battery is guided to use electricity for the first time, and low-current charging is performed after the battery power is lower than a preset power threshold, and the charging power of the battery in each charging stage is obtained, which is recorded as the first initial power; and the battery is continued to be guided to use electricity for the second time, and normal charging is performed after the battery power is lower than the preset power threshold again, and the charging power of the battery in each charging stage is obtained, which is recorded as the second initial power.

3. The method for analyzing battery capacity loss according to claim 1, characterized in that: The battery charging stages are divided according to their corresponding charging MAP.

4. The method for analyzing battery capacity loss according to claim 1 or 2, characterized in that: The steps of obtaining the charging capacity of the battery at each charging stage also include: The charging power in each charging stage is screened, and the screened charging power is recorded as the first initial power / the second initial power / the first comparison power / the second comparison power.

5. The method for analyzing battery capacity loss according to claim 4, characterized in that: The steps for screening the charge quantity at each charging stage include: For each charging stage, Obtain the temperature change of the battery during the current charging stage and calculate the average value of the temperature change; The charging quantity corresponding to the average value being lower than the preset temperature threshold is discarded.

6. The method for analyzing battery capacity loss according to claim 4, characterized in that: The step of screening the charging power in each charging stage also includes: For each charging stage, The charging quantity corresponding to the battery not fully undergoing the current charging stage is discarded.

7. The method for analyzing battery capacity loss according to claim 1, characterized in that: The step of calculating the first attenuation value of low-current charging according to the ratio of the first initial power to the first comparison power in the same charging stage includes: For each charging stage, identify whether the first initial power in the current charging stage has a corresponding first comparison power: If yes, then calculating the ratio of the first initial power to its corresponding first comparison power; If not, the first initial power is discarded; The average of all ratios is calculated and used as the first attenuation value.

8. The method for analyzing battery capacity loss according to claim 1, characterized in that: The step of calculating the second attenuation value of normal charging according to the ratio of the second initial power to the second comparison power in the same charging stage includes: For each charging stage, identify whether the second initial power in the current charging stage has a corresponding second comparison power: If yes, then calculating the ratio of the second initial power to its corresponding second comparison power; If not, the second initial power is discarded; The average of all ratios is calculated and used as the second attenuation value.

9. The method for analyzing battery capacity loss according to claim 7 or 8, characterized in that: The number of said ratios exceeds at least half the number of battery charging stages.

10. The method for analyzing battery capacity loss according to claim 1, characterized in that: The step of identifying the capacity loss and power loss of the battery according to the first attenuation value and the second attenuation value comprises: The difference between the first attenuation value and the second attenuation value is taken as the power loss of the battery, and the difference between the first attenuation value and 1 is taken as the capacity loss of the battery.

11. The method for analyzing battery capacity loss according to claim 1, characterized in that: Also includes: According to the capacity loss and power loss of the battery, When its capacity loss exceeds a preset first percentage, the user is advised to replace the battery; When the power loss exceeds a preset second percentage, the user is advised to reduce the use of high power of the battery.

12. An electronic controller, characterized in that: A method for analyzing battery capacity loss according to any one of claims 1 to 11.

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