Battery performance evaluation method, intelligent device and storage medium
By conducting capacity testing and percentage calculations on the battery, the problem of low accuracy in battery performance evaluation in existing technologies has been solved, enabling the quantification and optimization of battery performance indicators, extending battery life, and improving user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NIO TECH ANHUI CO LTD
- Filing Date
- 2024-11-05
- Publication Date
- 2026-05-08
AI Technical Summary
Existing methods cannot quantify the degree of physical and chemical self-discharge, resulting in low accuracy in battery performance evaluation and making it difficult to meet practical needs.
By conducting capacity tests on the battery, the discharge capacity under initial conditions, first conditions, and second conditions is obtained. The proportion of chemical self-discharge and physical self-discharge is calculated, and the battery performance indicators are determined and evaluated based on these proportions.
This enables the quantification of battery performance indicators, improves the accuracy of battery performance evaluation, helps optimize battery design, extends battery life, and enhances user satisfaction.
Smart Images
Figure CN121995247A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of battery technology, specifically providing a battery performance evaluation method, a smart device, and a storage medium. Background Technology
[0002] Lithium-ion batteries exhibit two degradation modes during application: cycle degradation and calendar degradation, corresponding to their cycle life and calendar life, respectively. The key factors affecting the calendar life of lithium-ion batteries are chemical self-discharge and physical self-discharge. Physical self-discharge is affected by burrs, dust, and metallic impurities in the lithium-ion battery manufacturing process, while chemical self-discharge is affected by moisture, electrolyte composition, and the stability of the SEI film. Therefore, analyzing the factors affecting calendar life and quantifying the degree of physical and chemical self-discharge is of great significance for optimizing battery design and improving battery performance.
[0003] Existing methods cannot quantify the degree of physical and chemical self-discharge, resulting in low accuracy in battery performance evaluation and making it difficult to meet practical needs. 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 accuracy in battery performance evaluation using existing methods. This application provides a battery performance evaluation method, a smart device, and a storage medium.
[0005] In a first aspect, this application provides a battery performance evaluation method, the method comprising:
[0006] The battery is subjected to a capacity test to obtain a first discharge capacity, a second discharge capacity, and a third discharge capacity, wherein the first discharge capacity is the discharge capacity of the battery in its initial state, the second discharge capacity is the discharge capacity of the battery under a first condition, and the third discharge capacity is the discharge capacity of the battery under a second condition.
[0007] The performance indicators of the battery are determined based on the first discharge capacity, the second discharge capacity, and the third discharge capacity.
[0008] The battery performance is evaluated based on the aforementioned performance indicators.
[0009] In one embodiment of this application, obtaining the first discharge capacity of the battery includes:
[0010] Charge the battery to a preset SOC;
[0011] The battery is discharged to the cutoff voltage according to the first discharge current;
[0012] The first discharge capacity is determined based on the first discharge current and the first discharge duration.
[0013] In one embodiment of this application, obtaining the second discharge capacity and the third discharge capacity of the battery includes:
[0014] Charge the battery to a preset SOC;
[0015] The batteries are stored at a first temperature and a second temperature, respectively.
[0016] The battery after storage at the first temperature and the second temperature is subjected to discharge capacity tests to obtain the second discharge capacity and the third discharge capacity.
[0017] In one embodiment of this application, the discharge capacity test of the battery after storage at the first temperature and the second temperature includes:
[0018] The second discharge capacity is determined based on the second discharge current and the second discharge duration by discharging the battery stored at the first temperature to the cutoff voltage according to the second discharge current;
[0019] The third discharge capacity is determined based on the third discharge current and the third discharge duration, after the battery has been stored at the second temperature, is discharged to the cutoff voltage according to the third discharge current.
[0020] In one embodiment of this application, before storing the battery at the first temperature and the second temperature respectively, the method further includes applying a preset constraint force to the battery.
[0021] In one embodiment of this application, the battery performance indicators include the percentage of chemical self-discharge and the percentage of physical self-discharge at a first temperature; determining the battery performance indicators based on the first discharge capacity, the second discharge capacity, and the third discharge capacity includes:
[0022] Determine a first difference between the first discharge capacity and the second discharge capacity, a second difference between the third discharge capacity and the second discharge capacity, and a third difference between the first discharge capacity and the third discharge capacity;
[0023] The chemical self-discharge ratio is determined based on the ratio between the second difference and the first difference;
[0024] The proportion of physical self-discharge is determined based on the ratio between the third difference and the first difference.
[0025] In one embodiment of this application, the sum of the chemical self-discharge ratio and the physical self-discharge ratio is 1.
[0026] In one embodiment of this application, the performance indicators of the battery include the percentage of chemical self-discharge and the percentage of physical self-discharge at a first temperature;
[0027] The performance evaluation of the battery based on the performance indicators includes:
[0028] When the percentage of chemical self-discharge is less than the first threshold, the chemical self-discharge performance of the battery is qualified.
[0029] When the percentage of physical self-discharge is less than the second threshold, the physical self-discharge performance of the battery is qualified.
[0030] In a second aspect, a smart device is provided, comprising:
[0031] At least one processor;
[0032] And, a memory communicatively connected to the at least one processor;
[0033] The memory stores a computer program, which, when executed by the at least one processor, is the aforementioned battery performance evaluation method.
[0034] In a third 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 battery performance evaluation method described in any of the preceding claims.
[0035] The above-described technical solutions of this application have at least one or more of the following features. Beneficial effects:
[0036] The battery performance evaluation method provided in this application includes: conducting capacity tests on the battery to obtain a first discharge capacity, a second discharge capacity, and a third discharge capacity, wherein the first discharge capacity is the discharge capacity of the battery in its initial state, the second discharge capacity is the discharge capacity of the battery under a first condition, and the third discharge capacity is the discharge capacity of the battery under a second condition; determining the battery's performance indicators based on the first, second, and third discharge capacities; and evaluating the battery's performance based on these performance indicators. By using different discharge capacities, more accurate battery performance indicators can be obtained, thereby quantifying battery performance indicators. Accurate evaluation of battery performance based on these indicators helps optimize battery products, extend battery life, and provide users with a better user experience, thus improving user satisfaction. Attached Figure Description
[0037] 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:
[0038] Figure 1 This is a schematic diagram of the main process of a battery performance evaluation method in one embodiment of this application;
[0039] Figure 2 This is a schematic diagram of the main structure of a battery performance evaluation device in one embodiment of this application;
[0040] Figure 3 This is a schematic diagram of the main 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] Current traditional methods cannot quantify the degree of physical and chemical self-discharge, resulting in low accuracy in battery performance evaluation and making it difficult to meet practical needs.
[0044] Therefore, this application proposes a battery performance evaluation method, a smart device, and a storage medium.
[0045] See appendix Figure 1 , Figure 1This is a schematic flowchart of the main steps of a battery performance evaluation method according to an embodiment of this application.
[0046] like Figure 1 As shown, the battery performance evaluation method in this application embodiment mainly includes the following steps S10-S30.
[0047] Step S10: Perform a capacity test on the battery to obtain the first discharge capacity, the second discharge capacity, and the third discharge capacity of the battery, wherein the first discharge capacity is the discharge capacity of the battery in the initial state, the second discharge capacity is the discharge capacity of the battery under the first condition, and the third discharge capacity is the discharge capacity of the battery under the second condition.
[0048] The first discharge capacity Q1 is the discharge capacity of the battery in its initial state, which is the baseline value before any storage or aging treatment.
[0049] The first condition is to store the battery in an environment at a first temperature for a preset time.
[0050] Second discharge capacity Q T1 It is the discharge capacity obtained by storing the battery in an environment at a first temperature for a preset time.
[0051] The second condition is to store the battery in an environment at a second temperature for a preset time.
[0052] Second discharge capacity Q T2 It is the discharge capacity obtained by storing the battery in an environment at a second temperature for a preset time.
[0053] Step S20: Determine the battery performance indicators based on the first discharge capacity, the second discharge capacity, and the third discharge capacity.
[0054] Battery performance metrics include physical self-discharge percentage and chemical self-discharge percentage. Physical self-discharge percentage represents the proportion of capacity loss due to physical causes (such as internal structural defects, burrs, metal shavings, etc.) to the total capacity loss. Chemical self-discharge percentage represents the proportion of capacity loss due to chemical reactions (such as electrolyte decomposition, material impurities, etc.) to the total capacity loss.
[0055] Step S30: Evaluate the battery performance based on performance indicators.
[0056] Based on steps S10-S30 above, the battery is first subjected to capacity testing to obtain the first discharge capacity, second discharge capacity, and third discharge capacity. The first discharge capacity is the battery's discharge capacity in its initial state, the second discharge capacity is the battery's discharge capacity under a first condition, and the third discharge capacity is the battery's discharge capacity under a second condition. Based on the first, second, and third discharge capacities, the battery's performance indicators are determined. The battery's performance is then evaluated based on these performance indicators. By using different discharge capacities, more accurate battery performance indicators can be obtained, thus quantifying battery performance. Accurate evaluation of battery performance based on these indicators helps optimize battery products, extend battery life, and provide users with a better user experience, thereby improving user satisfaction.
[0057] The following provides further explanation of steps S10 to S30.
[0058] Specifically, in one embodiment of this application, obtaining the first discharge capacity in step S10 can be achieved through the following steps S101 to S103.
[0059] Step S101: Charge the battery to the preset SOC.
[0060] The preset SOC (State of Charge) can be a pre-set SOC value, which can be adaptively adjusted according to the specific usage scenario. For example, 60% SOC, 80% SOC, 100% SOC, etc. can be used as examples of the preset SOC.
[0061] Step S102: Discharge the battery to the cutoff voltage according to the first discharge current.
[0062] The first discharge current can be a preset discharge current; for example, any one of 0.1C to 2C can be used as an example of the first current.
[0063] The cutoff voltage is related to the type of battery. For example, taking a ternary lithium battery, 2.5V can be used as an example of the preset cutoff voltage.
[0064] Step S103: Determine the first discharge capacity based on the preset discharge current and the first discharge duration.
[0065] Specifically, the battery is first charged to a preset SOC, and then discharged to the cutoff voltage according to the first discharge current, so as to obtain the discharge time (i.e. the first discharge duration). The product of the first discharge current and the first discharge duration is the first discharge capacity.
[0066] Specifically, in one embodiment of this application, obtaining the second discharge capacity and the third discharge capacity in step S10 can be achieved through steps S104 to S106.
[0067] Step S104: Charge the battery to the preset SOC.
[0068] The preset SOC (State of Charge) can be a pre-set SOC value, which can be adaptively adjusted according to the specific usage scenario. For example, 60% SOC, 80% SOC, 100% SOC, etc. can be used as examples of the preset SOC.
[0069] Specifically, this step involves further charging the battery after discharging it to the cutoff voltage in the aforementioned step S102, in order to charge it to a preset SOC.
[0070] In one specific embodiment of this application, before storing the battery at a first temperature and a second temperature respectively, the method further includes applying a preset constraint force to the battery.
[0071] Specifically, a preset constraint force can be applied to the battery using a clamp. For example, the constraint force can be 800N to 2000N.
[0072] By applying constraints under laboratory conditions, real-world battery usage can be better simulated, allowing for the evaluation of battery performance in current environments. Understanding battery behavior under pressure in advance can identify potential safety hazards, such as internal short circuits and thermal runaway. This helps improve battery design, enhance structural strength and pressure resistance, thereby improving overall safety.
[0073] Step S105: Store the battery at a first temperature and a second temperature respectively.
[0074] The first temperature and the second temperature can be preset temperatures, which can be adapted to the actual usage scenario. For example, any temperature value between 0℃ and 60℃ can be used as an example of the first temperature, and any temperature value between -30℃ and -15℃ can be used as an example of the second temperature.
[0075] In one specific embodiment of this application, the method further includes: storing the battery at a first temperature and a second temperature for a preset time.
[0076] The preset duration can be a pre-set time, which can be adjusted adaptively according to the actual usage scenario. For example, any period from 3 to 180 days can be used as an example of the preset duration.
[0077] Specifically, the battery can be stored at a first temperature and a second temperature for a preset duration.
[0078] Step S106: Perform discharge capacity tests on the batteries stored at the first temperature and the second temperature respectively to obtain the second discharge capacity and the third discharge capacity.
[0079] Specifically, step S106 can be implemented through the following steps S1061 to S1062.
[0080] Step S1061: Discharge the battery stored at the first temperature to the cutoff voltage according to the second discharge current, and determine the second discharge capacity based on the second discharge current and the second discharge duration.
[0081] The second discharge current can be a preset discharge current. For example, any one of 0.1C to 2C can be used as an example of the second current.
[0082] The cutoff voltage is related to the type of battery. For example, taking a ternary lithium battery, 2.5V can be used as an example of the preset cutoff voltage.
[0083] Specifically, starting from the preset SOC, the battery is discharged according to the second discharge current until the cutoff voltage is reached, and the discharge time (i.e. the second discharge duration) can be obtained. The product of the second discharge current and the second discharge duration is the second discharge capacity.
[0084] Step S1062: Discharge the battery stored at the second temperature to the cutoff voltage according to the third discharge current, and determine the third discharge capacity based on the third discharge current and the third discharge duration.
[0085] The third discharge current can be a pre-set discharge current; for example, any one of 0.1C to 2C can be used as an example of the third current.
[0086] The cutoff voltage is related to the type of battery. For example, taking a ternary lithium battery, 2.5V can be used as an example of the preset cutoff voltage.
[0087] Specifically, starting from the preset SOC, the battery is discharged according to the third discharge current until the cutoff voltage is reached, thus obtaining the discharge time (i.e., the third discharge duration). The product of the third discharge current and the third discharge duration is the third discharge capacity.
[0088] By obtaining the first discharge capacity, the second discharge capacity, and the third discharge capacity, the battery's performance indicators can be accurately calculated, which is beneficial for accurately evaluating battery performance.
[0089] The above is a further explanation of step S10. Step S20 will be further explained below.
[0090] The battery's performance indicators include the percentage of chemical self-discharge and the percentage of physical self-discharge at the first temperature. Specifically, step S20 can be achieved through the following steps S201 to S202.
[0091] Step S201: Determine the first difference between the first discharge capacity and the second discharge capacity, the second difference between the third discharge capacity and the second discharge capacity, and the third difference between the first discharge capacity and the third discharge capacity.
[0092] Specifically, the first difference is the difference between the first discharge capacity Q1 and the second discharge capacity Q. T1 The difference between the two values represents the difference in discharge capacity between the battery in its initial state and after high-temperature storage. The second difference is the third discharge capacity Q. T2 With the second discharge capacity Q T1 The difference between the two values represents the difference in discharge capacity between the battery after low-temperature storage and after high-temperature storage. The third difference is the difference between the first discharge capacity Q1 and the third discharge capacity Q. T2 The difference between the values represents the difference in discharge capacity between the battery in its initial state and after low-temperature storage.
[0093] Step S202: Determine the proportion of chemical self-discharge based on the ratio between the second difference and the first difference.
[0094] Specifically, the formula for calculating the percentage of chemical self-discharge corresponding to the first temperature is (Q T2 -Q T1 ) / (Q1-Q T1 This reflects the percentage of total capacity loss due to chemical reactions under the first temperature storage condition. A high percentage indicates that chemical self-discharge is the primary factor.
[0095] Step S203: Determine the physical self-discharge ratio based on the ratio between the third difference and the first difference. In one embodiment of this application, the sum of the chemical self-discharge ratio and the physical self-discharge ratio is 1.
[0096] Specifically, the formula for calculating the percentage of physical self-discharge corresponding to the first temperature is (Q1-Q). T2 ) / (Q1-Q T1 This reflects the proportion of capacity loss due to physical causes (such as internal structural defects, burrs, etc.) to the total capacity loss under the first temperature storage condition. If this proportion is high, it indicates that physical self-discharge is the main factor.
[0097] By calculating the proportion of chemical self-discharge and physical self-discharge, battery performance can be accurately assessed, the main causes of battery self-discharge can be clearly identified, and targeted improvement measures can be taken to improve the overall performance of the battery.
[0098] The above is a further explanation of step S20. Step S30 will be further explained below.
[0099] Specifically, step S30 can be achieved through the following steps S301 to S302.
[0100] Step S301: When the proportion of chemical self-discharge is less than the first threshold, the chemical self-discharge performance of the battery is qualified.
[0101] The first threshold can be a value obtained in advance through experiments, and can be adaptively adjusted according to the actual use scenario. For example, 98%, 98.5%, 99%, 99.5%, etc. can be used as examples of the first threshold.
[0102] Specifically, when the percentage of chemical self-discharge is less than the first threshold, the battery's chemical self-discharge performance is considered acceptable. When the percentage of chemical self-discharge is greater than or equal to the first threshold, it indicates that the battery's chemical self-discharge is too high, which will lead to problems such as rapid capacity decline, shortened cycle life, and performance degradation. In this case, the battery's material properties, moisture content, and chemical impurities should be analyzed to optimize the battery.
[0103] Step S302: When the proportion of physical self-discharge is less than the second threshold, the physical self-discharge performance of the battery is qualified.
[0104] The second threshold can be a value obtained in advance through experiments, and can be adaptively adjusted according to the actual use case. For example, 1.5%, 2%, 2.5%, etc. can be used as examples of the second threshold.
[0105] Specifically, when the percentage of physical self-discharge is less than the second threshold, the battery's physical self-discharge performance is considered acceptable. When the percentage of physical self-discharge is greater than or equal to the second threshold, it indicates that the battery's physical self-discharge is too high, which will lead to problems such as battery capacity decay, shortened lifespan, and unstable performance. In this case, battery process control should be strengthened to reduce burrs, metal shavings, dust, etc., in order to optimize the battery.
[0106] By analyzing the proportions of chemical and physical self-discharge in a battery, battery design can be optimized, improving stability and lifespan, and reducing capacity decay caused by self-discharge. By improving overall battery performance and reliability, end users will experience a better user experience, reducing inconvenience caused by battery failures and ultimately increasing user satisfaction.
[0107] Next, taking a ternary lithium cathode, a graphite anode, a 50Ah rated capacity, and a pouch-and-laminate battery structure as an example, the battery performance evaluation method of this application will be described in detail through the following steps S1-S8.
[0108] Step S1: Test the battery's discharge capacity Q1 at 100% SOC, which is 50.2Ah, and the discharge current is 0.33C.
[0109] Step S2: Divide the batteries into two groups, labeled Group A and Group B, with at least one cell in each group.
[0110] Step S3: Adjust both sets of batteries to 100% SOC.
[0111] Step S4: Use clamps to constrain the two sets of batteries, with a constraint force of 2000N for each set.
[0112] Step S5: Store the two groups of cells, A and B, at 45℃ and -20℃ respectively.
[0113] Step S6: The storage time for both sets of batteries is 30 days.
[0114] Step S7: Calibrate the discharge capacities of the two sets of batteries after storage at a rate of 0.33C to Q. T1 =46.2Ah, Q T2 =48Ah.
[0115] Step S8: Calculate the percentage of capacity loss caused by physical self-discharge and chemical self-discharge of the battery at 45℃, where...
[0116] The percentage of chemical self-discharge after storage at 45℃ for 30 days is: (Q) T2 -Q T1 ) / (Q1-Q T1 =45%.
[0117] The percentage of physical self-discharge after storage at 45℃ for 30 days is: (Q1-Q T2 ) / (Q1-Q T1 =55%.
[0118] Analysis shows that the battery's physical self-discharge is too high, and the battery manufacturing process should be strengthened to reduce burrs, metal shavings, dust, etc.
[0119] 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.
[0120] Furthermore, this application also provides a battery performance evaluation device.
[0121] See appendix Figure 2 , Figure 2This is a main structural block diagram of a battery performance evaluation device according to an embodiment of this application.
[0122] like Figure 2 As shown, the battery performance evaluation device in this embodiment mainly includes an acquisition module 11, a determination module 12, and an evaluation module 13. In some embodiments, one or more of the acquisition module 11, the determination module 12, and the evaluation module 13 can be combined into a single module.
[0123] In some embodiments, the acquisition module 11 may be configured to perform a capacity test on the battery to obtain a first discharge capacity, a second discharge capacity, and a third discharge capacity of the battery, wherein the first discharge capacity is the discharge capacity of the battery in an initial state, the second discharge capacity is the discharge capacity of the battery under a first condition, and the third discharge capacity is the discharge capacity of the battery under a second condition.
[0124] The determination module 12 can be configured to determine the battery's performance indicators based on the first discharge capacity, the second discharge capacity, and the third discharge capacity.
[0125] The evaluation module 13 can be configured to evaluate the performance of the battery based on the performance indicators.
[0126] In one implementation, a description of the specific functions can be found in steps S10-S30.
[0127] The aforementioned battery performance evaluation device is used for performing Figure 1 The battery performance evaluation method embodiments shown are similar in technical principle, the technical problems solved and the technical effects 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 performance evaluation device can be referred to the content described in the embodiments of the battery performance evaluation method, and will not be repeated here.
[0128] 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.
[0129] 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.
[0130] 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.
[0131] 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 performance evaluation method described in any of the above embodiments. See also Figure 3 As shown, Figure 3 The structure of a smart device is illustrated by way of example, which includes a processor 100 and a memory 200.
[0132] 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 that performs the battery performance evaluation method of the above-described method embodiments. This program can be loaded and run by a processor to implement the above-described battery performance evaluation 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.
[0133] 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.
[0134] 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.
[0135] 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.
[0136] 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 performance, characterized in that, The method includes: The battery is subjected to a capacity test to obtain a first discharge capacity, a second discharge capacity, and a third discharge capacity, wherein the first discharge capacity is the discharge capacity of the battery in its initial state, the second discharge capacity is the discharge capacity of the battery under a first condition, and the third discharge capacity is the discharge capacity of the battery under a second condition. The performance indicators of the battery are determined based on the first discharge capacity, the second discharge capacity, and the third discharge capacity. The battery performance is evaluated based on the aforementioned performance indicators.
2. The battery performance evaluation method according to claim 1, characterized in that, Obtaining the first discharge capacity of the battery includes: Charge the battery to a preset SOC; The battery is discharged to the cutoff voltage according to the first discharge current; The first discharge capacity is determined based on the first discharge current and the first discharge duration.
3. The battery performance evaluation method according to claim 1, characterized in that, Obtaining the second discharge capacity and the third discharge capacity of the battery includes: Charge the battery to a preset SOC; The batteries are stored at a first temperature and a second temperature, respectively. The battery after storage at the first temperature and the second temperature is subjected to discharge capacity tests to obtain the second discharge capacity and the third discharge capacity.
4. The battery performance evaluation method according to claim 3, characterized in that, The discharge capacity test performed on the battery after storage at the first temperature and the second temperature includes: The second discharge capacity is determined based on the second discharge current and the second discharge duration by discharging the battery stored at the first temperature to the cutoff voltage according to the second discharge current; The third discharge capacity is determined based on the third discharge current and the third discharge duration, after the battery has been stored at the second temperature, is discharged to the cutoff voltage according to the third discharge current.
5. The battery performance evaluation method according to claim 3, characterized in that, Before storing the battery at the first temperature and the second temperature respectively, the method further includes applying a preset constraint force to the battery.
6. The battery performance evaluation method according to claim 1, characterized in that, The battery's performance indicators include the percentage of chemical self-discharge and the percentage of physical self-discharge at a first temperature; determining the battery's performance indicators based on the first discharge capacity, the second discharge capacity, and the third discharge capacity includes: Determine a first difference between the first discharge capacity and the second discharge capacity, a second difference between the third discharge capacity and the second discharge capacity, and a third difference between the first discharge capacity and the third discharge capacity; The chemical self-discharge ratio is determined based on the ratio between the second difference and the first difference; The proportion of physical self-discharge is determined based on the ratio between the third difference and the first difference.
7. The battery performance evaluation method according to claim 6, characterized in that, The sum of the chemical self-discharge ratio and the physical self-discharge ratio is 1.
8. The battery performance evaluation method according to claim 1, characterized in that, The battery's performance indicators include the percentage of chemical self-discharge and the percentage of physical self-discharge at the first temperature. The performance evaluation of the battery based on the performance indicators includes: When the percentage of chemical self-discharge is less than the first threshold, the chemical self-discharge performance of the battery is qualified. When the percentage of physical self-discharge is less than the second threshold, the physical self-discharge performance of the battery is qualified.
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 performance evaluation method according to any one of claims 1 to 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 performance evaluation method according to any one of claims 1 to 8.