Battery charging capability evaluation method, rapid charging method, equipment and medium

Abstract

The invention relates to the technical field of batteries, particularly provides a battery charging capability evaluation method, a rapid charging method, equipment and a medium, and aims to solve the technical problem of low safety and stability of an existing method. In order to achieve the purpose, the battery charging capability evaluation method comprises the steps of obtaining a preset charging interval; carrying out charging capability calibration at a preset rate in a preset charging interval, and obtaining target coulombic efficiency under the preset rate; and evaluating the charging capability of the battery based on the target coulombic efficiency. Therefore, charging capacity calibration is performed at the preset multiplying power in the preset charging interval, so that more accurate target coulombic efficiency can be obtained, and the charging capacity of the battery can be accurately evaluated. And the charging rate is optimized based on the evaluation result of the target coulombic efficiency, so that the fast charging performance of the battery can be improved, the charging time is shortened, and the use experience of a user is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically providing a method for evaluating battery charging capability, a fast charging method, equipment, and medium. Background Technology

[0002] With the increasing prevalence of smart devices, people have become more demanding of the electrochemical components within them (such as batteries). For example, people not only require batteries to be lightweight, but also to have short charging times and long operating lifespans.

[0003] Long charging time is one of the factors restricting the rapid popularization of smart devices. The existing charging method is to increase the charging current, but increasing the charging current without limit will lead to lithium plating on the negative electrode of the battery, thereby affecting the battery's safety performance and cycle stability. Summary of the Invention

[0004] To overcome the aforementioned shortcomings, this application is proposed to provide a solution, or at least a partial solution, to the technical problem of low safety and stability in existing methods. This application provides a method for evaluating battery charging capability, a fast charging method, an apparatus, and a medium.

[0005] In a first aspect, this application provides a method for evaluating battery charging capability, the method comprising:

[0006] Obtain the preset charging range;

[0007] Within the preset charging range, the charging capacity is calibrated at a preset rate to obtain the target coulombic efficiency at the preset rate.

[0008] The charging capability of the battery is evaluated based on the target coulombic efficiency.

[0009] In one embodiment of this application, the target coulombic efficiency includes a first set of coulombic efficiencies and a second set of coulombic efficiencies;

[0010] The step of calibrating the charging capability at a preset rate within the preset charging range includes:

[0011] Within the preset charging range, perform multiple charge-discharge tests at a first rate to obtain the first set of coulombic efficiencies;

[0012] Multiple charge-discharge cycles are performed at a second rate within the preset charging range to obtain the second coulomb efficiency set.

[0013] In one embodiment of this application, the first multiplier is less than the second multiplier, and the second multiplier is at least one multiplier in the range of [2C, 10C].

[0014] In one embodiment of this application, the multi-cycle charge-discharge test at the first rate includes:

[0015] The battery is charged at a constant current rate to n% SOC, and then discharged at a constant current rate to a preset cutoff voltage to obtain the coulombic efficiency corresponding to n% SOC.

[0016] The battery is charged at a constant current rate to 2n% SOC, and then discharged at a constant current rate to a preset cutoff voltage to obtain the coulombic efficiency corresponding to 2n% SOC.

[0017] Repeat the above steps until the battery is charged at the first rate to m% SOC using constant current, and then discharged at the third rate to a preset cutoff voltage using constant current, to obtain the coulombic efficiency corresponding to m% SOC, where m is the maximum value of the preset charging range, and 0≤n≤m.

[0018] In one embodiment of this application, the multi-cycle charge-discharge test at the second rate includes:

[0019] The battery is charged at a constant current rate to n% SOC, and discharged at a constant current rate to a preset cutoff voltage to obtain the coulombic efficiency corresponding to n% SOC.

[0020] The battery is charged at a constant current rate to 2n% SOC at the second rate, and discharged at a constant current rate to a preset cutoff voltage at the third rate to obtain the coulombic efficiency corresponding to 2n% SOC.

[0021] Repeat the above steps until the battery is charged at a constant current at the second rate to m% SOC, and then discharged at a constant current at the third rate to a preset cutoff voltage to obtain the coulombic efficiency corresponding to m% SOC, where m is the maximum value of the preset charging range, and 0≤n≤m.

[0022] In one embodiment of this application, evaluating the charging capability of the battery based on the target coulombic efficiency includes:

[0023] Obtain the difference between the coulomb efficiency corresponding to each SOC in the first coulomb efficiency set and the second coulomb efficiency set; When the difference is greater than a preset threshold, the SOC corresponding to the second multiplier is obtained; The charging capability of the battery is obtained based on the SOC corresponding to the second rate.

[0024] In one embodiment of this application, the preset charging range is [0, X%SOC], where X≤95%.

[0025] In a second aspect, a fast charging method is provided, characterized in that the method includes:

[0026] The battery's charging capability is assessed according to the aforementioned battery charging capability assessment method.

[0027] The battery is fast-charged based on its charging capability.

[0028] In a third aspect, a smart device is provided, comprising:

[0029] At least one processor;

[0030] And, a memory communicatively connected to the at least one processor;

[0031] The memory stores a computer program, which is executed by the at least one processor of the aforementioned battery charging capability evaluation method or battery fast charging method.

[0032] In a fourth aspect, a computer-readable storage medium is provided, wherein a plurality of program codes are stored therein, the program codes being adapted to be loaded and run by a processor to perform the aforementioned battery charging capability evaluation method, or to perform the aforementioned battery fast charging method.

[0033] The above-described technical solutions of this application have at least one or more of the following features. Beneficial effects:

[0034] The battery charging capability evaluation method in this application includes: obtaining a preset charging range; calibrating the charging capability within the preset charging range at a preset rate to obtain a target coulombic efficiency at the preset rate; and evaluating the battery's charging capability based on the target coulombic efficiency. By calibrating the charging capability within the preset charging range at a preset rate, a more accurate target coulombic efficiency can be obtained, thereby accurately evaluating the battery's charging capability. Optimizing the charging rate based on the evaluation results of the target coulombic efficiency can improve the battery's fast charging performance, thereby shortening charging time and improving the user's charging experience. Attached Figure Description

[0035] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0036] Figure 1 This is a schematic diagram of the main process of a battery charging capability evaluation method in one embodiment of this application;

[0037] Figure 2This is a complete flowchart illustrating a method for evaluating battery charging capability in one embodiment of this application;

[0038] Figure 3 This is a schematic flowchart of a battery fast charging method in one embodiment of this application;

[0039] Figure 4 This is a schematic diagram of the main structure of a battery charging capability evaluation device according to an embodiment of this application;

[0040] Figure 5 This is a schematic diagram of the structure of a smart device in one embodiment of this application. Detailed Implementation

[0041] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0042] In the description of this application, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and can also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The terms "at least one A or B" or "at least one of A and B" have a similar meaning to "A and / or B" and can include only A, only B, or A and B. The singular terms "a" or "this" can also include plural forms.

[0043] The current traditional charging method is to increase the charging current. However, increasing the charging current without limit will cause lithium plating on the negative electrode of the battery, thereby affecting the battery's safety performance and cycle stability.

[0044] See appendix Figure 1 , Figure 1 This is a schematic flowchart of the main steps of a battery charging capability evaluation method according to an embodiment of this application.

[0045] like Figure 1 As shown, the battery charging capability evaluation method in this application embodiment mainly includes the following steps S10-S30.

[0046] Step S10: Obtain the preset charging range.

[0047] The preset charging range refers to a pre-set range of State of Charge (SOC) during battery charging, within which battery performance can be ensured to be relatively stable and safe.

[0048] For example, a lithium battery can be used as an example of the battery.

[0049] In one specific embodiment of this application, the preset charging range is [0, X%SOC], where X≤95%.

[0050] Step S20: Within a preset charging range, calibrate the charging capacity at a preset rate to obtain the target coulombic efficiency at the preset rate.

[0051] The charging rate refers to the ratio of the current intensity used during charging to the battery's rated capacity. For example, 1C means charging with the current intensity of the battery's rated capacity, which can theoretically fully charge the battery in 1 hour; 2C means charging with the current intensity of twice the battery's rated capacity, which can theoretically fully charge the battery in 0.5 hours.

[0052] The preset magnification is a pre-set magnification, which can be an empirical value and can be adjusted adaptively according to the actual usage scenario.

[0053] Charging capability calibration refers to charging and discharging a battery within a preset charging range at a specific preset rate, and recording relevant charging data such as voltage, current, temperature, or capacity during the process.

[0054] Coulombic efficiency (CE) is an indicator that measures the utilization rate of electrons during battery charging and discharging. It is calculated as: Coulombic efficiency = (actual charge / actual discharge) * 100%.

[0055] Step S30: Evaluate the battery's charging capability based on the target coulombic efficiency.

[0056] A battery's charging capability refers to its ability to accept a large current charge in a short period of time while maintaining good coulombic efficiency and thermal stability. Charging capability is typically assessed by factors such as the maximum tolerable charging rate, charging time, and temperature changes during charging. A battery with strong charging capability can charge quickly in a short time without compromising its safety and lifespan.

[0057] Based on steps S10-S30 above, a preset charging range is first obtained; within the preset charging range, the charging capacity is calibrated at a preset rate to obtain the target coulombic efficiency at the preset rate; and the battery's charging capacity is evaluated based on the target coulombic efficiency. By calibrating the charging capacity within the preset charging range at a preset rate, a more accurate target coulombic efficiency can be obtained, thereby accurately evaluating the battery's charging capacity. Optimizing the charging rate based on the evaluation results of the target coulombic efficiency can improve the battery's fast charging performance, thereby shortening the charging time and improving the user's charging experience.

[0058] The following provides further explanation of steps S20 to S30.

[0059] The target coulombic efficiency includes a first coulombic efficiency set and a second coulombic efficiency set. The coulombic efficiency set refers to a set of coulombic efficiency values ​​obtained after multiple charge-discharge cycle tests at a preset rate within a preset charging range.

[0060] Specifically, step S20 can be implemented through steps S201 to S202.

[0061] Step S201: Perform multiple charge-discharge tests at the first rate within the preset charging range to obtain the first coulomb efficiency set.

[0062] Specifically, step S201 is implemented through the following steps S2011 to S2013.

[0063] Step S2011: Charge the battery at a constant current rate to n% SOC, and discharge the battery at a constant current rate to a preset cutoff voltage to obtain the coulombic efficiency corresponding to n% SOC.

[0064] The first rate is a pre-set low-rate charging current rate. For example, 0.9C, 1C, and 1.1C can be used as examples of the first rate.

[0065] The third rate is a preset current discharge rate. For example, any rate from 0.1C to 0.33C can be used as an example of the third rate.

[0066] The preset cutoff voltage is the lowest permissible voltage during battery discharge. Its specific value depends on the battery type and can be adapted to different usage scenarios. For example, using a ternary lithium battery, 2.5V can be considered as an example of the preset cutoff voltage.

[0067] For example, 5, 10, 20, etc. can all be used as examples of n.

[0068] Specifically, the battery is first charged at a first rate to n% SOC using constant current, and then discharged at a third rate using constant current to discharge from n% SOC to a preset cutoff voltage, and the coulombic efficiency corresponding to n% SOC during the charge and discharge process is determined.

[0069] Coulomb efficiency = (actual charge input / actual discharge input) * 100%, where actual charge input is the actual amount of electricity charged during the process of charging to n% SOC at the first rate, and actual discharge input is the actual amount of electricity discharged during the process of discharging from n% SOC to the preset cutoff voltage.

[0070] Step S2012: Charge the battery at a constant current rate to 2n% SOC, and discharge the battery at a constant current rate to a preset cutoff voltage to obtain the coulombic efficiency corresponding to 2n% SOC.

[0071] Specifically, the battery is first charged at a first rate to 2n% SOC using constant current, and then discharged at a third rate using constant current to discharge from 2n% SOC to a preset cutoff voltage. The coulombic efficiency corresponding to 2n% SOC during the charging and discharging process is then obtained.

[0072] Coulomb efficiency = (actual charge input / actual discharge input) * 100%, where actual charge input is the actual charge input during the process of charging to 2n% SOC at the first rate, and actual discharge input is the actual discharge input recorded during the process of discharging from 2n% SOC to the preset cutoff voltage.

[0073] Step S2013: Repeat the above steps until the battery is charged at a constant current at a first rate to m% SOC, and discharged at a constant current at a third rate to a preset cutoff voltage. Determine the coulombic efficiency corresponding to m% SOC, where m is the maximum value of the preset charging range, and 0≤n≤m.

[0074] Specifically, repeat the above steps, each time increasing the target SOC to 2n% SOC, 3n% SOC, ... up to m% SOC, where m is the maximum value of the preset charging range, before discharging to the preset cutoff voltage. For example, if n = 10, charge sequentially to 10% SOC, 20% SOC, 30% SOC, ... up to 80% SOC (assuming the preset charging range is 0% to 80% SOC). After each new SOC is reached, perform a complete charge-discharge cycle and record the corresponding coulombic efficiency.

[0075] Step S202: Perform multiple charge-discharge tests at the second rate within the preset charging range to obtain the second coulomb efficiency set.

[0076] In one specific embodiment of this application, the first multiplier is less than the second multiplier, and the second multiplier is at least one multiplier in the range of [2C, 10C].

[0077] Specifically, the second multiplier can be at least one multiplier in the range of [2C, 10C]. For example, the second multiplier can be 2C, 3C, 4C, 5C, etc., without any specific limitation.

[0078] Step S202 can be achieved through the following steps S2021 to S2023.

[0079] Step S2021: Charge the battery at a second rate with constant current to n% SOC, discharge the battery at a third rate with constant current to a preset cutoff voltage, and determine the coulombic efficiency corresponding to n% SOC.

[0080] Specifically, the battery is first charged at a second rate to n% SOC using constant current, and then discharged at a third rate using constant current to discharge from n% SOC to a preset cutoff voltage. The coulombic efficiency corresponding to n% SOC during the charge and discharge process is then determined.

[0081] Coulomb efficiency = (actual charge input / actual discharge output) * 100%, where actual charge input is the actual charge input during the process of charging to n% SOC at the second rate, and actual discharge output is the actual discharge output recorded during the process of discharging from n% SOC to the preset cutoff voltage.

[0082] By performing multiple charge-discharge cycles at the first rate, a series of coulombic efficiencies corresponding to a certain state of charge (i.e., the first set of coulombic efficiencies) can be obtained.

[0083] Step S2022: Charge the battery at a constant current rate to 2n% SOC, and discharge the battery at a constant current rate to a preset cutoff voltage, and determine the coulombic efficiency corresponding to 2n% SOC.

[0084] Specifically, the battery is first charged at a second rate to 2n% SOC using constant current, and then discharged at a third rate using constant current to discharge from 2n% SOC to a preset cutoff voltage. The coulombic efficiency corresponding to 2n% SOC during this charge and discharge process is then determined.

[0085] Coulomb efficiency = (actual charge input / actual discharge input) * 100%, where actual charge input is the actual charge input during the second-rate charging to 2n% SOC process, and actual discharge input is the actual discharge input recorded during the discharge from 2n% SOC to the preset cutoff voltage process.

[0086] Step S2023: Repeat the above steps until the battery is charged at a constant current rate to m% SOC, and discharged at a constant current rate to a preset cutoff voltage. Determine the coulombic efficiency corresponding to m% SOC, where m is the maximum value of the preset charging range, 0≤n≤m.

[0087] Specifically, repeat the above steps, each time increasing the target SOC to 2n% SOC, 3n% SOC, ... up to m% SOC using the second charging rate, where m is the maximum value of the preset charging range, before discharging to the preset cutoff voltage. For example, if n = 10, charge sequentially to 10% SOC, 20% SOC, 30% SOC, ... up to 80% SOC (assuming the preset charging range is 0% to 80% SOC). After each new SOC is reached, perform a complete charge-discharge cycle and record the corresponding coulombic efficiency.

[0088] By conducting multiple charge-discharge cycles at the second rate, a series of coulombic efficiencies corresponding to a certain state of charge (i.e., the second set of coulombic efficiencies) can be obtained.

[0089] The above is a further explanation of step S20. Step S30 will be further explained below.

[0090] Specifically, step S30 is implemented through the following steps S301 to S303.

[0091] Step S301: Obtain the difference between the coulomb efficiency corresponding to each SOC in the first coulomb efficiency set and the second coulomb efficiency set.

[0092] Specifically, for each SOC point, the difference between the Coulomb efficiency in the first Coulomb efficiency set and the Coulomb efficiency at the corresponding SOC point in the second Coulomb efficiency set is calculated. For example, if at 50% SOC, the Coulomb efficiency in the first Coulomb efficiency set is 98%, while the Coulomb efficiency in the second Coulomb efficiency set is 95%, then the difference is 3%.

[0093] Step S302: When the difference is greater than the preset threshold, obtain the SOC corresponding to the second multiplier.

[0094] The preset threshold can be a pre-defined value obtained from experiments, and can be adjusted adaptively according to different usage scenarios. No specific limitations are imposed on it.

[0095] Specifically, by comparing the difference with a preset threshold, the SOC point at which the coulombic efficiency begins to change significantly can be determined, indicating that charging at the second (higher) rate at this SOC point has a significant impact on the coulombic efficiency of the battery.

[0096] Alternatively, a first curve can be plotted with SOC on the x-axis and coulombic efficiency on the y-axis based on the first set of coulombic efficiencies, and a second curve can be plotted with SOC on the x-axis and coulombic efficiency on the y-axis based on the second set of coulombic efficiencies. If there are multiple second-rate charging options, there will be multiple second curves. By comparing the first and second curves, the SOC point where a significant difference begins to appear between the two curves can be identified, indicating that charging at the second-rate (higher rate) at that SOC point has a significant impact on the battery's coulombic efficiency.

[0097] Step S303: Obtain the battery's charging capability based on the SOC corresponding to the second rate.

[0098] Specifically, based on the SOC point corresponding to the second rate, it means that the battery can be charged at the corresponding second rate within the range of 0 to that SOC point, that is, the battery has good charging capability at the second rate.

[0099] By comparing the coulombic efficiency at different charging rates, the charging capability of a battery at various points of charge (SOC) can be more accurately evaluated. Based on the evaluation results, more reasonable charging strategies can be developed to avoid using excessively high charging rates at certain SOC points, thereby protecting the battery and extending its lifespan. Simultaneously, ensuring fast charging without compromising coulombic efficiency helps reduce battery overheating and other safety risks, providing a faster charging experience and meeting user needs.

[0100] For example, the method for evaluating the battery charging capability of this application will be described in detail using a pouch battery as an example. The positive electrode of the battery is made of ternary material, the negative electrode of the battery is made of graphite material, and the battery capacity is 5Ah.

[0101] Figure 2 This is a schematic diagram illustrating the complete process of the method for evaluating the battery charging capability of this application. Specifically, as shown... Figure 2 As shown, the method for evaluating battery charging capability can be implemented through the following steps S1-S5.

[0102] Step S1: Obtain the preset charging range.

[0103] For example, the preset charging range can be set to [0, 80% SOC].

[0104] Step S2: Perform low-rate current charging capability calibration to obtain the first coulomb efficiency set.

[0105] Specifically, constant current charging is performed at 1C with a cutoff condition of 5% SOC, and constant current discharging is performed at 0.33C with a discharge cutoff condition of 2.5V. The coulombic efficiency of this process is recorded as Z1. The above process is repeated, and the cutoff condition of constant current charging is increased by 5% SOC in each cycle until the cutoff condition of the last cycle is 80% SOC. The coulombic efficiency of each cycle is recorded as Z2, Z3, Z4...Z16 (i.e., the first coulombic efficiency set).

[0106] Step S3: Perform high-rate current charging capability calibration to obtain the second coulomb efficiency set.

[0107] Specifically, constant current charging is performed at a second rate R (R = 2, 2.5, 3, 3.5), with a cutoff condition of 5% SOC. Constant current discharging is performed at 0.33C, with a discharge cutoff condition of 2.5V. The coulombic efficiency of this process is recorded as K1. The above process is repeated, with the cutoff condition of constant current charging increasing by 5% SOC in each cycle, until the cutoff condition of the last cycle is 80% SOC. The coulombic efficiency of each cycle is recorded as K2, K3, K4...K16.

[0108] Step S4: Determine the available SOC range for a specific current.

[0109] Specifically, by plotting the coulomb efficiency corresponding to the SOC value at the 1C and R ratios, we can obtain the coulomb efficiency curves k1 and kR at different ratios. The maximum usable SOC at the R ratio is the SOC value corresponding to when the k1 and kR curves begin to show discrepancies, thus obtaining the usable SOC interval corresponding to the R ratio.

[0110] Step S5: Assess the battery's charging capability.

[0111] Specifically, the battery's charging capability can be obtained by using the available SOC range corresponding to the R-rate.

[0112] For example, Table 1 below can serve as an example of the maximum charging capacity for different SOC ranges. Table 1 Maximum charging capacity in different SOC ranges Maximum charging capacity 2C 2.5C 3C 3.5C SOC range 0-75％ 0-70％ 0-65％ 0-45％

[0113] Furthermore, this application also provides a method for fast battery charging, such as... Figure 3 As shown, this method can be specifically implemented through the following steps S40-S50.

[0114] Step S40: Evaluate the battery's charging capability according to the aforementioned battery charging capability evaluation method.

[0115] Specifically, the battery charging capability can be obtained through the battery charging capability evaluation method in the foregoing embodiments, which will not be elaborated here.

[0116] Step S50: Quickly charge the battery based on its charging capability.

[0117] Specifically, the battery can be fast-charged based on its charging capacity. For example, using Table 1 above, during battery charging, depending on the battery's charging capacity, 3.5C can be used for fast charging within the range of [0, 45% SOC], 3C can be used within the range of (45% SOC, 65% SOC], 2.5C can be used within the range of (65% SOC, 70% SOC], and 2C can be used within the range of (70% SOC, 75% SOC]. This achieves the goal of fast charging the battery, thereby improving the user's charging experience.

[0118] It should be noted that although the steps in the above embodiments are described in a specific order, those skilled in the art will understand that in order to achieve the effect of this application, different steps do not necessarily have to be executed in such an order. They can be executed simultaneously (in parallel) or in other orders, and these variations are all within the scope of protection of this application.

[0119] Furthermore, this application also provides a device for evaluating battery charging capability.

[0120] See appendix Figure 4 , Figure 4 This is a main structural block diagram of a battery charging capability evaluation device according to an embodiment of this application. Figure 4 As shown, the battery charging capability evaluation device in this embodiment mainly includes an acquisition module 11, a calibration module 12, and an evaluation module 13. In some embodiments, one or more of the acquisition module 11, calibration module 12, and evaluation module 13 can be combined into a single module.

[0121] In some embodiments, the acquisition module 11 can be configured to acquire a preset charging range.

[0122] The calibration module 12 is configured to calibrate the charging capability at a preset rate within a preset charging range, and obtain the target coulombic efficiency at the preset rate.

[0123] Evaluation module 13 is configured to evaluate the charging capability of the battery based on the target coulombic efficiency.

[0124] In one implementation, a description of the specific functions can be found in steps S10-S30.

[0125] The aforementioned battery charging capability evaluation device is used for performing Figure 1 The embodiments of the battery charging capability evaluation method shown are similar in technical principle, technical problem solved and technical effect produced. Those skilled in the art can clearly understand that, for the sake of convenience and brevity, the specific working process and related descriptions of the battery charging capability evaluation device can be referred to the contents described in the embodiments of the battery charging capability evaluation method, and will not be repeated here.

[0126] Furthermore, it should be understood that since the various modules are only provided to illustrate the functional units of the device described in this application, the physical devices corresponding to these modules may be the processor itself, or a part of the processor's software, hardware, or a combination of both. Therefore, the number of modules shown in the figures is merely illustrative.

[0127] Those skilled in the art will understand that the various modules in the device can be adaptively split or combined. Such splitting or combining of specific modules will not cause the technical solution to deviate from the principles of this application; therefore, the technical solutions after splitting or combining will fall within the protection scope of this application.

[0128] Those skilled in the art will understand that all or part of the processes in the method of the above-described embodiment can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium can include any entity or device capable of carrying the computer program code, a medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0129] Furthermore, this application also provides a smart device, which may include at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program, which, when executed by the at least one processor, implements the battery charging capability evaluation method or the battery fast charging method described in any of the above embodiments. See also Figure 5 As shown, Figure 5 The structure of a smart device is illustrated by way of example, which includes a processor 100 and a memory 200.

[0130] Furthermore, this application also provides a computer-readable storage medium. In one embodiment of the computer-readable storage medium according to this application, the computer-readable storage medium can be configured to store a program for performing a battery charging capability evaluation method or a battery fast charging method of the above-described method embodiments. This program can be loaded and run by a processor to implement the above-described battery charging capability evaluation method or battery fast charging method. For ease of explanation, only the parts related to the embodiments of this application are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of this application. The computer-readable storage medium can be a memory device formed by various electronic devices. Optionally, in the embodiments of this application, the computer-readable storage medium is a non-transitory computer-readable storage medium.

[0131] The relevant user personal information that may be involved in the various embodiments of this application is processed in strict accordance with the requirements of laws and regulations, following the principles of legality, legitimacy, and necessity, based on the reasonable purpose of the business scenario, and includes personal information that users actively provide or that is generated as a result of using the product / service, as well as personal information obtained with user authorization.

[0132] The personal information processed in this application will vary depending on the specific product / service scenario and will be based on the specific scenario in which the user uses the product / service. This may involve the user's account information, device information, driving information, vehicle information, or other related information. The applicant will treat the user's personal information and its processing with the utmost diligence.

[0133] This application attaches great importance to the security of users' personal information and has taken reasonable and feasible security protection measures that comply with industry standards to protect users' information and prevent unauthorized access, disclosure, use, modification, damage or loss of personal information.

[0134] The technical solution of this application has been described in conjunction with the specific embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A method for evaluating battery charging capability, characterized in that, The method includes: Obtain the preset charging range; Within the preset charging range, the charging capacity is calibrated at a preset rate to obtain the target coulombic efficiency at the preset rate. The charging capability of the battery is evaluated based on the target coulombic efficiency.

2. The method for evaluating battery charging capability according to claim 1, characterized in that, The target coulomb efficiency includes a first coulomb efficiency set and a second coulomb efficiency set; The step of calibrating the charging capability at a preset rate within the preset charging range includes: Within the preset charging range, perform multiple charge-discharge tests at a first rate to obtain the first set of coulombic efficiencies; Multiple charge-discharge cycles are performed at a second rate within the preset charging range to obtain the second coulomb efficiency set.

3. The method for evaluating battery charging capability according to claim 2, characterized in that, The first multiplier is less than the second multiplier, and the second multiplier is at least one multiplier in the range of [2C, 10C].

4. The method for evaluating battery charging capability according to claim 2, characterized in that, The multi-cycle charge-discharge test at the first rate includes: The battery is charged at a constant current rate to n% SOC, and then discharged at a constant current rate to a preset cutoff voltage to obtain the coulombic efficiency corresponding to n% SOC. The battery is charged at a constant current rate to 2n% SOC, and then discharged at a constant current rate to a preset cutoff voltage to obtain the coulombic efficiency corresponding to 2n% SOC. Repeat the above steps until the battery is charged at the first rate to m% SOC using constant current, and then discharged at the third rate to a preset cutoff voltage using constant current, to obtain the coulombic efficiency corresponding to m% SOC, where m is the maximum value of the preset charging range, and 0≤n≤m.

5. The method for evaluating battery charging capability according to claim 2, characterized in that, The multi-cycle charge-discharge test at the second rate includes: The battery is charged at a constant current rate to n% SOC, and discharged at a constant current rate to a preset cutoff voltage to obtain the coulombic efficiency corresponding to n% SOC. The battery is charged at a constant current rate to 2n% SOC at the second rate, and discharged at a constant current rate to a preset cutoff voltage at the third rate to obtain the coulombic efficiency corresponding to 2n% SOC. Repeat the above steps until the battery is charged at a constant current at the second rate to m% SOC, and then discharged at a constant current at the third rate to a preset cutoff voltage to obtain the coulombic efficiency corresponding to m% SOC, where m is the maximum value of the preset charging range, and 0≤n≤m.

6. The method for evaluating battery charging capability according to claim 2, characterized in that, The evaluation of the battery's charging capability based on the target coulombic efficiency includes: Obtain the difference between the coulomb efficiency corresponding to each SOC in the first coulomb efficiency set and the second coulomb efficiency set; When the difference is greater than a preset threshold, the SOC corresponding to the second multiplier is obtained; The charging capability of the battery is obtained based on the SOC corresponding to the second rate.

7. The method for evaluating battery charging capability according to claim 1, characterized in that, The preset charging range is [0, X%SOC], where X≤95.

8. A method for fast charging a battery, characterized in that, The method includes: The battery charging capability is evaluated using the battery charging capability evaluation method according to any one of claims 1-7; The battery is fast-charged based on its charging capability.

9. A smart device, characterized in that, include: At least one processor; And, a memory communicatively connected to the at least one processor; The memory stores a computer program, which, when executed by the at least one processor, implements the battery charging capability evaluation method according to any one of claims 1 to 7, or performs the battery fast charging method according to claim 8.

10. A computer-readable storage medium storing a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by a processor to perform the battery charging capability evaluation method of any one of claims 1 to 7, or to perform the battery fast charging method of claim 8.

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