Method, apparatus and medium for determining battery np ratio

Abstract

The application discloses a battery NP ratio determination method, device, equipment and medium, and generally relates to the field of batteries. The method comprises the following steps: obtaining an initial NP ratio of a battery of a first battery formula and N first NP ratios of the battery of the first battery formula under N test conditions; updating the initial NP ratio based on the N first NP ratios, and the updated initial NP ratio meets a standard NP ratio; determining a second battery formula according to the updated initial NP ratio, obtaining N second NP ratios of the battery of the second battery formula under the N test conditions, and determining that the updated initial NP ratio is a target NP ratio of the battery if the N second NP ratios all meet the standard NP ratio and meet a battery capacity design condition.

Description

Technical Field

[0001] This disclosure generally relates to the field of batteries, and more particularly to a method, apparatus, device, and medium for determining the NP ratio of a battery. Background Technology

[0002] With the development of battery technology, batteries have long been able to provide electrical energy to various terminals through charging and discharging. In terms of specific principles, batteries achieve the charging and discharging process and obtain electrical energy capacity through the insertion and extraction of ions between the positive and negative electrodes.

[0003] Battery energy capacity requires capacity design. For capacity design, the ratio of negative electrode capacity to positive electrode capacity per unit area (NP ratio) is a crucial indicator. A lower NP ratio results in higher battery energy density and, consequently, a larger battery capacity. However, an excessively low NP ratio can easily lead to the formation of battery crystals, which can puncture the battery separator and compromise battery safety. Related technologies utilize different NP ratios and potential measurements to maximize battery capacity while maintaining battery safety.

[0004] However, there are actually many factors that affect the NP ratio of a battery. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a method, apparatus, device and medium for determining the battery NP ratio, which can solve the problem of excessive resource address space occupied in JWT, thereby greatly saving transmission resources between service nodes and improving the transmission efficiency between service nodes to a certain extent.

[0006] Firstly, a method for determining the NP ratio of a battery is provided, the method comprising:

[0007] Obtain the initial NP ratio of the battery of the first battery formulation and the N first NP ratios of the battery of the first battery formulation under N test conditions;

[0008] The initial NP ratio is updated based on the N first NP ratios, and the updated initial NP ratio satisfies the standard NP ratio.

[0009] The second battery formulation is determined based on the updated initial NP ratio. N second NP ratios of the battery formulation under the N test conditions are obtained. If all N second NP ratios meet the standard NP ratio and the battery capacity design conditions, the updated initial NP ratio is determined as the target NP ratio of the battery.

[0010] In this application, after obtaining the initial NP ratio of the battery with the first battery formulation and N first NP ratios of the battery with the first battery formulation under N test conditions, the initial NP ratio is updated based on the above N first NP ratios (the updated initial NP ratio meets the standard NP ratio), and the battery formulation is further updated using the updated initial NP ratio to determine the second battery formulation; then, the battery with the second battery formulation is tested again under the aforementioned N test conditions to obtain N second NP ratios; if all N second NP ratios meet the aforementioned standard NP ratio and satisfy the battery capacity design conditions, the updated initial NP ratio can be taken as the target NP ratio of the battery. In this way, by testing the battery under multiple conditions and adjusting the battery formulation design accordingly, the optimal battery formulation design is determined under various conditions. This ensures that the battery has the minimum NP ratio under all usage conditions and maximizes battery safety.

[0011] Secondly, a device for determining the NP ratio of a battery is provided, applied to a first node, the device comprising:

[0012] The acquisition module is used to acquire the initial NP ratio of the battery of the first battery formula and the N first NP ratios of the battery of the first battery formula under N test conditions, where N is a positive integer;

[0013] The execution module is used to update the initial NP ratio based on the N first NP ratios obtained by the acquisition module, wherein the updated initial NP ratio satisfies the standard NP ratio;

[0014] The acquisition module is further configured to determine the second battery formula based on the updated initial NP ratio updated by the execution module, acquire N second NP ratios of the battery of the second battery formula under the N test conditions, and if all N second NP ratios meet the standard NP ratio and the battery capacity design conditions, then determine the updated initial NP ratio as the target NP ratio of the battery.

[0015] Thirdly, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements the method described in the first aspect.

[0016] Fourthly, a computer-readable storage medium is provided having a computer program stored thereon, characterized in that the program, when executed by a processor, implements the method described in the first aspect above.

[0017] Fifthly, a computer program product is provided, which includes instructions that, when executed by a processor, implement the method described in the first aspect above.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is one of the flowcharts illustrating the method for determining the NP ratio of a battery provided in this application embodiment;

[0021] Figure 2 This is a second schematic flowchart illustrating the method for determining the NP ratio of a battery provided in an embodiment of this application.

[0022] Figure 3 A schematic diagram of the structure of the battery NP ratio determination device provided in the embodiments of this application;

[0023] Figure 4 A schematic diagram of the structure of a computer device provided in an embodiment of this application. Detailed Implementation

[0024] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] With the development of battery technology, batteries have long been able to provide electrical energy to various terminals through charging and discharging. In principle, batteries achieve their charging and discharging process and obtain their energy capacity through the insertion and extraction of ions between the positive and negative electrodes. Taking lithium-ion batteries as an example, lithium-ion batteries achieve their charging and discharging process and obtain their battery capacity through the insertion and extraction of Li+ ions between the positive and negative electrodes.

[0027] For lithium-ion battery capacity design, the ratio of negative electrode capacity to positive electrode capacity per unit area (NP ratio) is a crucial indicator. During charging, Li+ ions are extracted from the positive electrode and inserted into the negative electrode. When the extracted Li+ ions exceed the amount that can be inserted into the negative electrode, the excess Li+ ions will deposit on the negative electrode surface, forming dendrites that may puncture the separator and cause safety issues. Therefore, an NP ratio greater than 1 is generally required. However, an excessively high NP ratio will reduce the battery's energy density. With the demand for fast charging, the operating temperature and temperature rise during battery charging and discharging affect the actual capacity utilization of the positive and negative electrode materials, leading to a discrepancy between the battery's preset NP ratio and its actual NP ratio. This makes determining the NP ratio even more difficult.

[0028] In related technologies, batteries with different NP ratios are designed, and the lithium plating potential of the negative electrode is analyzed to obtain the optimal NP ratio. Some technologies also consider the influence of variables such as coating amount on the NP ratio.

[0029] However, there are actually many factors that affect the NP ratio of a battery.

[0030] Figure 1 This is a flowchart illustrating a method for determining the NP ratio of a battery, as provided in an embodiment of this application. Figure 1 As shown, the method includes the following steps:

[0031] Step 301: Obtain the initial NP ratio of the battery of the first battery formulation and the N first NP ratios of the battery of the first battery formulation under N test conditions, where N is a positive integer.

[0032] In the embodiments of this application, the first battery formulation mentioned above refers to a battery formulation determined based on user requirements and / or the electrochemical performance of battery materials.

[0033] For example, the above user requirements may include at least one of the following: battery cell capacity, battery energy density, battery operating voltage, battery application rate, and battery cycle life.

[0034] For example, the above-mentioned electrochemical properties are used to indicate the electrochemical properties of the positive and negative electrode materials of the battery. For instance, in the case of a lithium-ion battery, the positive electrode material of the lithium-ion battery is a ternary nickel-cobalt-manganese positive electrode material, and the negative electrode material of the lithium-ion battery is graphite or graphite mixed with one or more of silicon-oxygen, silicon-carbon, and hard carbon.

[0035] It is understandable that the above-mentioned first battery formulation can be determined by the user based on the user's needs and / or the electrochemical performance of the battery materials. That is, the first battery formulation may not be the optimal battery performance, or may not actually meet the user's needs. Based on this, it is necessary to conduct various tests on the first battery formulation to make adjustments, so as to optimize the first battery formulation. For details, please refer to the following description, which will not be elaborated here.

[0036] Furthermore, based on the aforementioned user requirements and / or the electrochemical performance of the battery materials, a reasonable NP ratio and a first battery formulation can be determined. This reasonable NP ratio can be determined artificially based on past testing experience. That is, this reasonable NP ratio is not an NP ratio obtained through testing, but rather an NP ratio theoretically corresponding to the first battery formulation, calculated artificially.

[0037] In the embodiments of this application, the aforementioned initial NP ratio refers to the NP ratio obtained after testing the battery under the first battery formulation, that is, the actual NP ratio exhibited by the battery with the preset NP ratio during operation.

[0038] In this embodiment, the initial NP ratio can be used as a benchmark for subsequent adjustments to the formula design and NP ratio. That is, based on the initial NP ratio, the preset NP ratio and battery formula of the battery can be further optimized and adjusted. For example, a reasonable NP ratio a0 can be determined manually based on past experience. Then, based on the reasonable NP ratio a0, the initial NP ratio a1 of the battery with the first battery formula and the N first NP ratios a1 of the battery with the first battery formula under N test conditions can be obtained. Ni .

[0039] Optionally, in this embodiment of the application, obtaining the initial NP ratio of the battery of the first battery formulation includes: obtaining the initial NP ratio of the battery of the first battery formulation under initial test conditions.

[0040] For example, the initial test conditions described above may include: initial temperature and initial application rate. For instance, the initial temperature is 25°C.

[0041] In one example, under the aforementioned initial test conditions, obtaining the initial NP ratio of the battery of the first battery formulation specifically includes: under the initial test conditions, obtaining the initial battery parameters of the battery of the first battery formulation; and based on the aforementioned initial battery parameters, obtaining the initial NP ratio of the battery of the first battery formulation.

[0042] For example, when the battery is a lithium-ion battery, the above initial battery parameters include: the specific capacity of the battery and the coulombic efficiency of the battery.

[0043] Furthermore, the process of obtaining the specific capacity and coulombic efficiency of the battery requires determining the specific capacity and coulombic efficiency of the positive electrode and the negative electrode, respectively. Specifically, determining the specific capacity and coulombic efficiency of the positive electrode involves: fabricating a coin cell using a lithium sheet as the counter electrode, and conducting charge-discharge tests at an initial test temperature of 25°C; the voltage range is generally between 2.5-4.35V, and the application rate is generally 0.1C or 0.33C. Similarly, determining the specific capacity and coulombic efficiency of the negative electrode involves: fabricating a coin cell using a lithium sheet as the counter electrode, and conducting charge-discharge tests at an initial test temperature of 25°C; the voltage range is generally between 0-2V, and the application rate is generally 0.1C or 0.33C.

[0044] Furthermore, when the battery is a lithium-ion battery, the above-mentioned formula for calculating the initial NP ratio includes: the initial NP ratio is the minimum value between e1 and e2, where e1 = (content of negative electrode active material × areal density of negative electrode × reversible specific capacity of negative electrode ÷ initial coulombic efficiency of negative electrode) ÷ (content of positive electrode active material × areal density of positive electrode × reversible specific capacity of positive electrode ÷ initial coulombic efficiency of positive electrode), and e2 = (content of negative electrode active material × areal density of negative electrode × reversible specific capacity of negative electrode) ÷ (content of positive electrode active material × areal density of positive electrode × reversible specific capacity of positive electrode).

[0045] For example, assuming the first battery formulation is d0, under the initial test conditions, i.e., the initial temperature is 25°C and the initial application rate is 0.1C, the initial battery parameters of the first battery formulation d0, the initial specific capacity and the initial coulombic efficiency of the battery are obtained; then, based on the initial specific capacity and the initial coulombic efficiency, the initial NP ratio a1 of the battery with the first battery formulation d0 is obtained.

[0046] It is understandable that the aforementioned reasonable NP ratio is an NP ratio determined by human experience. Under this human-determined, i.e., preset NP ratio, a battery formula is obtained. However, due to the influence of factors such as the capacity utilization of the positive and negative electrode materials of the battery and the environment, the preset NP ratio may differ from the initial NP ratio obtained under actual initial test conditions. Therefore, the actual NP ratio, i.e. the initial NP ratio, should be obtained through actual testing based on the initial test conditions.

[0047] In this embodiment of the application, the above N test conditions can be test conditions that are to be changed by the battery compared to the initial test conditions.

[0048] It is understandable that in the actual application of batteries, the external environment and internal materials cannot remain stable and unchanging. For example, temperature may gradually rise to the temperature corresponding to the initial NP ratio during battery use, and the external temperature may also change, affecting the battery's own temperature. Therefore, in measuring the NP ratio of a battery, multiple test conditions should be comprehensively considered to determine the NP ratio under each test condition, i.e., the N NP ratios under the aforementioned N test conditions.

[0049] Furthermore, the aforementioned N test conditions should be related to the initial test conditions. For example, if the initial temperature in the initial test conditions is 25°C, then the temperatures in the N test conditions can include multiple temperatures within the range of 0-40°C. However, it is clear that a test temperature of 100°C is unnecessary, as a battery with an initial temperature of 25°C will not encounter a test temperature of 100°C.

[0050] Optionally, in this embodiment of the application, obtaining the N first NP ratios of the battery with the first battery formula under N test conditions includes: obtaining N sets of battery parameters of the battery with the first battery formula under N test conditions; and obtaining the N NP ratios of the battery with the first battery formula based on the N sets of battery parameters.

[0051] For example, when the battery is a lithium-ion battery, the above N battery parameters include: the specific capacity of the N batteries and the coulombic efficiency of the N batteries.

[0052] Furthermore, the N test conditions can be multi-dimensional test conditions. For example, the aforementioned N test conditions may include: N temperatures and N application scaling factors. For instance, the temperature and scaling factor can change simultaneously. In the initial test conditions, the initial temperature is 25°C and the scaling factor is 1°C. One of the N test conditions could be a temperature of 30°C and a scaling factor of 2°C.

[0053] Furthermore, when the battery is a lithium-ion battery, the calculation formula for each of the above N NP ratios includes: NP ratio = (content of negative electrode active material × density of negative electrode × initial specific capacity of negative electrode ÷ initial coulombic efficiency of negative electrode) ÷ (content of positive electrode active material × density of positive electrode × initial specific capacity of positive electrode ÷ initial coulombic efficiency of positive electrode).

[0054] Step 302: Update the initial NP ratio based on the above N first NP ratios.

[0055] In the embodiments of this application, the updated initial NP ratio described above satisfies the standard NP ratio.

[0056] As can be understood from the foregoing, the initial NP ratio mentioned above is the NP ratio corresponding to the first battery formulation determined according to requirements. The purpose of this application embodiment is to further optimize the NP ratio while avoiding potential safety hazards in the battery. Therefore, based on the aforementioned initially determined NP ratio, the battery of the first battery formulation is tested under N test conditions to verify the optimizability and optimization direction of the initial NP ratio, thereby updating the initial NP ratio. For example, based on the aforementioned initial NP ratio a1, the updated NP ratio is a1'.

[0057] In the embodiments of this application, the above-mentioned standard NP ratio can be used to indicate the NP ratio threshold under the premise of ensuring battery safety.

[0058] In the embodiments of this application, the aforementioned standard NP ratio can be preset or user-defined.

[0059] In one example, the aforementioned standard NP ratio can be used to indicate the standard range corresponding to the NP ratio, the upper limit parameter corresponding to the NP ratio, or the lower limit parameter corresponding to the NP ratio.

[0060] For example, for current lithium-ion batteries, the standard NP ratio corresponding to the above NP ratio can be a lower limit parameter of 1. Specifically, the NP ratio of the battery should be greater than or equal to 1.

[0061] Step 303: Determine the second battery formula based on the updated initial NP ratio, obtain N second NP ratios of the battery with the second battery formula under the N test conditions, and if all N second NP ratios are greater than or equal to the standard NP ratio and meet the battery capacity design conditions, then determine the updated initial NP ratio as the target NP ratio of the battery.

[0062] In the embodiments of this application, the above-mentioned battery capacity design conditions are used to indicate the test standards for battery safety testing.

[0063] In the embodiments of this application, the aforementioned target NP ratio is used to indicate the optimal battery NP ratio, that is, the NP ratio that can ensure battery safety while maximizing battery capacity.

[0064] In one example, if the battery described above is a lithium-ion battery, the battery capacity design conditions described above are the test standards for lithium plating testing. Specifically, lithium plating testing includes: testing the battery through three electrodes (positive electrode, negative electrode, and reference electrode) or disassembling the battery after full cycle to check whether lithium plating crystals are present at the battery interface. If they are not present, the test standards for lithium plating testing are met.

[0065] In this embodiment of the application, since the updated initial NP ratio is an optimized NP ratio compared to the previous initial NP ratio, the battery formula will also change if the battery is to reach the updated initial NP ratio. Therefore, it is necessary to determine the updated first battery formula based on the updated initial NP ratio, that is, to determine the second battery formula.

[0066] Furthermore, after determining the second battery formula, the battery of the second battery formula needs to be tested under N test conditions to obtain N test results (i.e. N second NP ratios). Only when all N second NP ratios meet the standard NP ratio and the battery capacity design conditions can it be said that the updated initial NP ratio is the final required and successfully optimized NP ratio.

[0067] For example, assuming the updated initial NP ratio a1' is already the optimal NP ratio, then it is necessary to test the updated initial NP ratio a1' under N conditions to obtain N test results a1' corresponding to the updated initial NP ratio a1' under the N test conditions. Ni (That is, N second NP ratios). If all N second NP ratios are greater than or equal to the standard NP ratio 1 and the battery capacity design conditions are met, it can be verified that the updated initial NP ratio a1' is the optimal NP ratio, that is, the updated initial NP ratio a1' is the target NP ratio.

[0068] In the method provided in this application embodiment, after obtaining the initial NP ratio of the battery with the first battery formula and N first NP ratios of the battery with the first battery formula under N test conditions, the initial NP ratio is updated based on the above N first NP ratios (the updated initial NP ratio meets the standard NP ratio), and the battery formula is further updated using the updated initial NP ratio to determine the second battery formula; then, the battery with the second battery formula is tested again under the aforementioned N test conditions to obtain N second NP ratios; if all N second NP ratios meet the aforementioned standard NP ratio and satisfy the battery capacity design conditions, the updated initial NP ratio can be used as the target NP ratio of the battery. In this way, by testing the battery under multiple conditions and adjusting the battery formula design accordingly, the optimal battery formula design is determined under various conditions. This ensures that the battery has the minimum NP ratio under all usage conditions and maximizes battery safety.

[0069] In another embodiment of this application, a specific implementation method for updating the initial NP ratio is also provided. For example, the specific implementation of "updating the initial NP ratio based on the above N first NP ratios" mentioned above includes: comparing the above N first NP ratios with the above initial NP ratio to obtain a comparison result; and updating the above initial NP ratio according to the comparison result by using a preset optimization function.

[0070] For example, the aforementioned preset optimization function is used to correct the initial NP ratio so that the updated initial NP ratio meets the standard NP ratio.

[0071] Understandably, when testing the NP ratio of the first battery formulation under multiple different test conditions, the comparison results of the N first NP ratios with the initial NP ratio may fall into the following three categories: 1) All N first NP ratios meet the standard NP ratio and some of the first NP ratios are less than or equal to the initial NP ratio; 2) Some or all of the N first NP ratios are less than the standard NP ratio; 3) All N first NP ratios are greater than the initial NP ratio.

[0072] Furthermore, as can be seen from the foregoing, the purpose of this application's embodiments is to optimize the initial NP ratio and the battery. Therefore, different strategies will be adopted to perform optimization for the aforementioned three situations.

[0073] For example, the aforementioned preset optimization function may include multiple optimization functions, with different optimization functions used to update the initial NP ratio corresponding to different comparison results.

[0074] Furthermore, for the three different comparison results mentioned above, two optimization functions are set up, namely the first preset optimization function and the second preset optimization function, which will be explained in detail below.

[0075] Optionally, the following section will first provide a detailed explanation of the use of the first preset optimization function. For example, the specific implementation of "updating the initial NP ratio based on the above comparison results using the preset optimization function" mentioned above includes: if the comparison results show that all N first NP ratios satisfy the standard NP ratio and Y of the N first NP ratios are less than the initial NP ratio, or M of the N first NP ratios do not satisfy the standard NP ratio, then the initial NP ratio is updated using the first preset optimization function, where 1≤Y≤N and 1≤M≤N.

[0076] For example, the first preset optimization function makes the following possible: the NP ratio that meets the standard NP ratio and is less than the initial NP ratio is updated to an NP ratio with a smaller difference from the standard NP ratio, or the initial NP ratio that does not meet the standard NP ratio is updated to an NP ratio that meets the standard NP ratio.

[0077] It is understandable that, when the comparison results show that all N first NP ratios meet the standard NP ratio and some first NP ratios are less than the initial NP ratio, the initial NP ratios corresponding to the N first NP ratios can be further optimized through the embodiments of this application; and when the comparison results show that M of the N first NP ratios do not meet the standard NP ratio, the initial NP ratios corresponding to the N first NP ratios can be corrected to update them to more reasonable initial NP ratios.

[0078] For example, combining the examples above, the above N first NPs are compared with a Ni All first NP ratios in the middle Ni All are greater than the standard NP ratio 1, and some, that is, the first NP ratio a Ni a Ni,i=y If the N first NP ratios a1 are less than the initial NP ratio a1 mentioned above, then the initial NP ratio a1 can be updated to the updated a1' using the first preset optimization function. Alternatively, the aforementioned N first NP ratios a1'... Ni The middle part, that is, the M first NP ratios a Ni,i=M If the NP ratio is less than the standard NP ratio 1, the initial NP ratio a1 can be updated to the updated initial NP ratio a1' using the first preset optimization function.

[0079] In one example, the formula for the first preset optimization function can be: Updated initial NP ratio = Initial NP ratio / Minimum of N first NP ratios.

[0080] Optionally, the use of the second preset optimization function will be further explained below. For example, the specific implementation of "updating the initial NP ratio based on the above N first NP ratios" mentioned above includes: if the comparison result is that all of the above N first NP ratios are greater than the initial NP ratio, then the initial NP ratio is updated through the second preset optimization function, where 1≤M≤N.

[0081] For example, the second preset optimization function makes the updated initial NP ratio such that it satisfies the standard NP ratio and is less than the initial NP ratio.

[0082] It is understandable that, if the comparison results show that all N first NP ratios are greater than the initial NP ratio, the initial NP ratios corresponding to the N first NP ratios can be corrected through the embodiments of this application, so that they are updated to a more reasonable initial NP ratio.

[0083] For example, combining the examples above, the above N first NPs are compared with a Ni If both are greater than the initial NP ratio a1, then the initial NP ratio a1 can be updated to the updated initial NP ratio a1' using the second preset optimization function.

[0084] In one example, the formula for the second preset optimization function can be: Updated initial NP ratio = Initial NP ratio × (Initial NP ratio / Minimum of N first NP ratios).

[0085] In this way, based on the different comparison results between the N first NP ratios and the initial NP ratio, different schemes for optimizing and updating the initial NP ratio can be identified, so that the updated initial NP ratio is a more reasonable NP ratio and battery, while also ensuring battery safety.

[0086] In another embodiment of this application, a specific implementation method is provided for updating the initial NP ratio after N second NP ratios fail to meet the standard NP ratio. For example, after the aforementioned "determining the second battery formula based on the updated initial NP ratio and obtaining N second NP ratios of the battery of the second battery formula under the N test conditions", the specific implementation includes: if X NP ratios among the N second NP ratios fail to meet the standard NP ratio, then comparing the X NP ratios with the standard NP ratio to obtain a comparison result; based on the comparison result, using a preset optimization function, updating the updated initial NP ratio again, where 1≤X≤N.

[0087] For example, the aforementioned preset optimization function is used to correct the updated initial NP ratio so that the initial NP ratio meets the standard NP ratio.

[0088] It is understood that, in the embodiments of this application, after updating the initial NP ratio, the battery with the second battery formulation and the updated initial NP ratio may still have some or all NP ratios that fail to meet the standard NP ratio under N test conditions. In such cases, if some or all NP ratios still fail to meet the standard NP ratio after updating the initial NP ratio, the battery can continue to be updated and corrected using a preset optimization function until the battery corresponding to the updated initial NP ratio meets the standard NP ratio under all N test conditions.

[0089] For example, following the above example, suppose that after updating the initial NP ratio a1 to the updated initial NP ratio a1' using the first preset optimization function or the second preset optimization function, and then testing the initial NP ratio a1' under N test conditions, the resulting test results are also the N second NP ratios a1'. Ni There may be some or all of a1' in it. Ni If the test result is less than the standard NP ratio 1, the preset optimization function is used to update the updated initial NP ratio a1' again until the updated initial NP ratio a1' is updated so that the test results under N test conditions are all greater than the standard NP ratio 1.

[0090] In this way, by combining a preset optimization function with a standard NP ratio for testing the updated one, if the updated initial NP ratio cannot meet the standard NP ratio, it is continuously updated until the updated initial NP ratio can meet the standard NP ratio. In this way, an optimized and practically usable target NP ratio can be found, thereby improving battery capacity and ensuring battery safety.

[0091] In another embodiment of this application, a specific implementation method is provided for detecting whether the battery capacity design conditions are met when the battery is a lithium-ion battery. For example, when the battery is a lithium-ion battery, the aforementioned statement "if all N second NP ratios meet the standard NP ratio and the battery capacity design conditions, then the updated initial NP ratio is determined to be the target NP ratio of the battery" is specifically implemented by: performing a lithium plating test using the N second NP ratios; if the battery with the updated initial NP ratio meets the test conditions of the lithium plating test, then the updated initial NP ratio is determined to be the target NP ratio of the lithium-ion battery.

[0092] For example, the test conditions for the above lithium plating test include: the second battery formulation battery will not have excess lithium ions deposited on the negative electrode surface to form dendrites, that is, there will be no problem of puncturing the separator.

[0093] In another embodiment of this application, a specific implementation method is provided for obtaining N second NP ratios under N test conditions to ensure that the battery capacity design is met. For example, the aforementioned "determining the second battery formula based on the updated initial NP ratio" includes: determining the battery parameters of the battery based on the updated initial NP ratio; and determining the second battery formula based on the battery parameters and the aforementioned battery formula formula, wherein the battery formula formula indicates the correspondence between the battery formula, battery parameters, and the NP ratio of the battery.

[0094] For example, the battery parameters mentioned above include specific capacity and coulombic efficiency.

[0095] For example, the above battery formulation formula is related to the formula for the NP ratio.

[0096] It is understandable that, based on the aforementioned formulas for calculating the NP ratio: e1 = (negative electrode active material content × negative electrode areal density × negative electrode reversible specific capacity ÷ negative electrode initial coulombic efficiency) ÷ (positive electrode active material content × positive electrode areal density × positive electrode reversible specific capacity ÷ positive electrode initial coulombic efficiency), or e2 = (negative electrode active material content × negative electrode areal density × negative electrode reversible specific capacity) ÷ (positive electrode active material content × positive electrode areal density × positive electrode reversible specific capacity), the battery formulation can be obtained using the NP ratio formula. It should be noted that the formula used here to obtain the battery formulation based on the NP ratio is the same as the formula used to calculate the initial NP ratio.

[0097] Specifically, battery formulations can include the battery's areal density and the content of active materials.

[0098] The following will be through Figure 2 The complete implementation process of the embodiments of this application is described below:

[0099] Example 1:

[0100] S201: Based on the above user requirements and / or the electrochemical performance of battery materials, and based on past experience, a reasonable NP ratio a0 is determined manually.

[0101] S202: Obtain the actual NP ratio of the battery at 25°C based on the current first battery formula d0, i.e. the initial NP ratio a1;

[0102] S203: Set N test conditions for the battery d0 of the first formula, and conduct tests under the above N test conditions;

[0103] Then compare the N test results with the N first NP values ​​of a. Ni Compared with the initial NP ratio a1, the following three test results will appear:

[0104] S204a: N first NP ratios a Ni All are greater than the standard NP ratio 1, and the first NP ratio of Y of them is greater than the standard NP ratio Ni,i=y Less than the above initial NP ratio a1

[0105] S204b: N first NP ratios a Ni The first NP ratio of M in the middle is a Ni,i=M Less than standard NP ratio 1

[0106] S204c: N first NP ratios a Ni All are greater than the initial NP ratio a1.

[0107] Based on the above three test results, the following two optimization methods are proposed:

[0108] S205a: For the cases in S204a and S204b, the initial NP ratio a1 is updated using the first preset optimization function to obtain the updated initial NP ratio a1'.

[0109] S205b: In response to the situation in S204c, the initial NP ratio a1 is updated using the second preset optimization function to obtain the updated initial NP ratio a1'.

[0110] S206: For the updated initial NP ratio a1', perform the test again to obtain N second NP ratios a1'. Ni .

[0111] For the N second NP ratios a1' Ni There are two ways to handle this.

[0112] S207a: In N second NP ratios a1' Ni If all NP ratios are greater than the standard NP ratio 1, then the updated initial NP ratio a1' is determined to be the target NP ratio, which is also the successfully optimized NP ratio.

[0113] S207b: In N second NP ratios a1' Ni There are X a1's in the middle. Ni If the NP ratio is less than the standard NP ratio 1, the first preset optimization function is used again to update the updated initial NP ratio a1', and tests are performed under N conditions until the updated initial NP ratio a1' is greater than the standard NP ratio 1.

[0114] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the training rule determination method described in this application. For example, it can execute... Figure 1 The steps of the method shown are as follows.

[0115] This application provides a computer program product containing instructions that are implemented by a processor at runtime. Figure 1 The steps of the method shown are as follows.

[0116] It should be noted that although the operation of the method of the present invention is described in a specific order in the accompanying drawings, this does not require or imply that the operations must be performed in that specific order, or that all the operations shown must be performed in order to achieve the desired result.

[0117] Figure 3 This is a block diagram of a battery NP ratio determination apparatus according to an embodiment of this application. This apparatus can be deployed on an authorized node (e.g., the first node described above). Reference Figure 3The device includes an acquisition module 601 and an execution module 602.

[0118] The acquisition module 601 is used to acquire the initial NP ratio of the battery of the first battery formula and the N first NP ratios of the battery of the first battery formula under N test conditions, where N is a positive integer;

[0119] Execution module 602 is used to update the initial NP ratio based on the N first NP ratios obtained by acquisition module 601, wherein the updated initial NP ratio satisfies the standard NP ratio;

[0120] The acquisition module 601 is further configured to determine the second battery formula based on the updated initial NP ratio updated by the execution module 602, acquire N second NP ratios of the battery of the second battery formula under the N test conditions, and if all N second NP ratios meet the standard NP ratio and meet the battery capacity design conditions, then determine the updated initial NP ratio as the target NP ratio of the battery.

[0121] In one embodiment, the execution module 602 is further configured to:

[0122] Compare the N first NP ratios with the initial NP ratio to obtain the comparison results;

[0123] Based on the comparison results, the initial NP ratio is updated using a preset optimization function. The preset optimization function is used to correct the initial NP ratio so that the updated initial NP ratio meets the standard NP ratio.

[0124] In one embodiment, the execution module 602 is further configured to:

[0125] If the comparison result is that all N first NP ratios satisfy the standard NP ratio and Y of the N first NP ratios are less than the initial NP ratio, or M of the N first NP ratios do not satisfy the standard NP ratio, then the initial NP ratio is updated through the first preset optimization function, where 1≤Y≤N and 1≤M≤N;

[0126] Wherein, the first preset optimization function causes: the NP ratio that satisfies the standard NP ratio and is less than the initial NP ratio to be updated to an NP ratio with a smaller difference from the standard NP ratio, or the initial NP ratio that does not satisfy the standard NP ratio to be updated to an NP ratio that satisfies the standard NP ratio.

[0127] In one embodiment, the execution module 602 is further configured to:

[0128] If the comparison result shows that all N first NP ratios are greater than the initial NP ratio, then the initial NP ratio is updated using the second preset optimization function, where 1≤M≤N;

[0129] Wherein, the second preset optimization function makes the updated initial NP ratio such that the updated initial NP ratio is an NP ratio that satisfies the standard NP ratio and is less than the initial NP ratio.

[0130] In one embodiment, the execution module 602 is further configured to: if there are X NP ratios among the N second NP ratios that do not satisfy the standard NP ratio, then compare the X NP ratios with the standard NP ratio to obtain a comparison result, 1≤X≤N; based on the comparison result, update the updated initial NP ratio again, and the preset optimization function is used to correct the updated initial NP ratio so that the corrected initial NP ratio satisfies the standard NP ratio.

[0131] In one embodiment, when the battery is a lithium-ion battery, the execution module 602 is specifically used for:

[0132] Lithium plating test is performed using the N second NP ratios;

[0133] If the battery with the updated initial NP ratio meets the test conditions for the lithium plating test, then the updated initial NP ratio is determined to be the target NP ratio of the lithium-ion battery.

[0134] In one embodiment, the execution module 602 is specifically used for:

[0135] Based on the updated initial NP ratio, determine the battery parameters of the battery;

[0136] A second battery formula is determined based on the battery parameters and the battery formula formula, wherein the battery formula formula is used to indicate the correspondence between the battery formula and the battery parameters and the NP ratio of the battery.

[0137] In this embodiment, the battery NP ratio determination device, after obtaining the initial NP ratio of a battery with a first battery formulation and N first NP ratios of the battery with the first battery formulation under N test conditions, updates the initial NP ratio based on the N first NP ratios (the updated initial NP ratio meets the standard NP ratio), and further updates the battery formulation using the updated initial NP ratio to determine the second battery formulation. Then, the battery with the second battery formulation is tested again under the aforementioned N test conditions to obtain N second NP ratios. If all N second NP ratios meet the aforementioned standard NP ratio and satisfy the battery capacity design conditions, the updated initial NP ratio can be taken as the target NP ratio of the battery. Thus, by testing the battery under multiple conditions and adjusting the battery formulation design accordingly, the optimal battery formulation design is determined under various conditions. This ensures that the battery has the minimum NP ratio under all usage conditions and maximizes battery safety.

[0138] It should be understood that the units described in the battery NP ratio determination device correspond to the various steps in the method described in the accompanying drawings. Therefore, the operations and features described above for the method also apply to the battery NP ratio determination device, the resource access device, and the units contained therein, and will not be repeated here. The battery NP ratio determination device and the resource access device can be pre-implemented in a browser or other security application on a computer device, or can be loaded into a browser or other security application on a computer device through download or other means. The corresponding units in the battery NP ratio determination device and the resource access device can cooperate with the units in the computer device to implement the solution of the embodiments of this application.

[0139] The division of modules or units mentioned in the detailed description above is not mandatory. In fact, according to the embodiments of this disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0140] It should be noted that for details not disclosed in the battery NP ratio determination device and resource access device in the embodiments of this application, please refer to the details disclosed in the above embodiments of this application, which will not be repeated here.

[0141] The following is for reference. Figure 4 , Figure 4 A schematic diagram of a computer device suitable for implementing embodiments of this application is shown. For example... Figure 4 As shown, the computer system 1700 includes a central processing unit (CPU) 1701, which can perform various appropriate actions and processes based on programs stored in read-only memory (ROM) 1702 or programs loaded from storage section 1708 into random access memory (RAM) 1703. RAM 1703 also stores various programs and data required for the system's operating instructions. CPU 1701, ROM 1702, and RAM 1703 are interconnected via bus 1704. Input / output (I / O) interface 1705 is also connected to bus 1704.

[0142] The following components are connected to I / O interface 1705: an input section 1706 including a keyboard, mouse, etc.; an output section 1707 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 1708 including a hard disk, etc.; and a communication section 1709 including a network interface card such as a LAN card, modem, etc. The communication section 1709 performs communication processing via a network such as the Internet. Drive 1710 is also connected to I / O interface 1705 as needed. Removable media 1711, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 1710 as needed so that computer programs read from them can be installed into storage section 1708 as needed.

[0143] Specifically, according to embodiments of this application, the flowchart above refers to... Figure 1 The described process can be implemented as a computer software program. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowchart. In such an embodiment, the computer program contains program code for performing the methods shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via communication section 1709, and / or installed from removable medium 1711. When the computer program is executed by central processing unit (CPU) 1701, it performs the functions defined in the system of this application.

[0144] It should be noted that the computer-readable medium shown in this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0145] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operational instructions of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two connected blocks may actually be executed substantially in parallel, or they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified functions or operational instructions, or using a combination of dedicated hardware and computer instructions.

[0146] The units or modules described in the embodiments of this application can be implemented in software or hardware. The described units or modules can also be housed in a processor; for example, a processor can be described as including a first receiving module, a second receiving module, and a transmitting module. The names of these units or modules do not, in certain circumstances, constitute a limitation on the unit or module itself.

[0147] In another aspect, this application also provides a computer-readable storage medium, which may be included in the electronic device described in the above embodiments, or may exist independently and not assembled into the electronic device. The computer-readable storage medium stores one or more programs that, when used by one or more processors, execute the battery NP ratio determination method described in this application.

[0148] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the foregoing disclosed concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A method for determining the NP ratio of a battery, characterized in that, The method includes: Obtain the initial NP ratio of the battery of the first battery formulation and the N first NP ratios of the battery of the first battery formulation under N test conditions, where N is a positive integer; The initial NP ratio is updated based on the N first NP ratios, and the updated initial NP ratio satisfies the standard NP ratio. The second battery formulation is determined based on the updated initial NP ratio. N second NP ratios of the battery formulation under the N test conditions are obtained. If all N second NP ratios meet the standard NP ratio and the battery capacity design conditions, the updated initial NP ratio is determined as the target NP ratio of the battery. The process of updating the initial NP ratio based on the N first NP ratios includes: comparing the N first NP ratios with the initial NP ratio to obtain a comparison result; and updating the initial NP ratio according to the comparison result using a preset optimization function, wherein the preset optimization function is used to correct the initial NP ratio so that the N second NP ratios corresponding to the updated initial NP ratio all satisfy the standard NP ratio. Based on the comparison results, the initial NP ratio is updated using a preset optimization function, including: if the comparison results show that all N first NP ratios satisfy the standard NP ratio, and Y of the N first NP ratios are less than the initial NP ratio, or M of the N first NP ratios do not satisfy the standard NP ratio, then the initial NP ratio is updated using a first preset optimization function, where 1≤Y≤N, 1≤M≤N; the first preset optimization function causes: the NP ratios that satisfy the standard NP ratio and are less than the initial NP ratio to be updated to NP ratios with a smaller difference from the standard NP ratio, or the initial NP ratios that do not satisfy the standard NP ratio to NP ratios that satisfy the standard NP ratio; the formula for the first preset optimization function is: updated initial NP ratio = initial NP ratio / minimum value among the N first NP ratios; Based on the comparison results, the initial NP ratio is updated using a preset optimization function, including: if the comparison results show that all N first NP ratios are greater than the initial NP ratio, then the initial NP ratio is updated using a second preset optimization function; the second preset optimization function ensures that the updated initial NP ratio is an NP ratio that satisfies the standard NP ratio and is less than the initial NP ratio; the formula for the second preset optimization function is: updated initial NP ratio = initial NP ratio × (initial NP ratio / minimum value among the N first NP ratios).

2. The method according to claim 1, characterized in that, The method further includes determining the second battery formulation based on the updated initial NP ratio, and obtaining the second battery formulation's battery with N second NP ratios under N test conditions, and then: If there are X NP ratios among the N second NP ratios that do not satisfy the standard NP ratio, then compare the X NP ratios with the standard NP ratio to obtain the comparison result, where 1≤X≤N; Based on the comparison results, the updated initial NP ratio is updated again using a preset optimization function. The preset optimization function is used to correct the updated initial NP ratio so that the corrected initial NP ratio meets the standard NP ratio.

3. The method according to claim 1, characterized in that, When the battery is a lithium-ion battery, if all N second NP ratios meet the standard NP ratio and the battery capacity design conditions, then the updated initial NP ratio is determined to be the target NP ratio of the battery, including: Lithium plating test is performed using the N second NP ratios; If the battery with the updated initial NP ratio meets the test conditions for the lithium plating test, then the updated initial NP ratio is determined to be the target NP ratio of the lithium-ion battery.

4. The method according to claim 1, characterized in that, The step of determining the second battery formulation based on the updated initial NP ratio includes: Based on the updated initial NP ratio, determine the battery parameters of the battery; A second battery formula is determined based on the battery parameters and the battery formula formula, wherein the battery formula formula is used to indicate the correspondence between the battery formula and the battery parameters and the NP ratio of the battery.

5. A device for determining the NP ratio of a battery, characterized in that, The device includes: The acquisition module is used to acquire the initial NP ratio of the battery of the first battery formula and the N first NP ratios of the battery of the first battery formula under N test conditions, where N is a positive integer; The execution module is used to update the initial NP ratio based on the N first NP ratios obtained by the acquisition module, wherein the updated initial NP ratio satisfies the standard NP ratio; The acquisition module is further configured to determine the second battery formula based on the updated initial NP ratio updated by the execution module, acquire N second NP ratios of the battery of the second battery formula under the N test conditions, and if all N second NP ratios meet the standard NP ratio and meet the battery capacity design conditions, then determine the updated initial NP ratio as the target NP ratio of the battery. The process of updating the initial NP ratio based on the N first NP ratios includes: comparing the N first NP ratios with the initial NP ratio to obtain a comparison result; and updating the initial NP ratio according to the comparison result using a preset optimization function, wherein the preset optimization function is used to correct the initial NP ratio so that the N second NP ratios corresponding to the updated initial NP ratio all satisfy the standard NP ratio. Based on the comparison results, the initial NP ratio is updated using a preset optimization function, including: if the comparison results show that all N first NP ratios satisfy the standard NP ratio, and Y of the N first NP ratios are less than the initial NP ratio, or M of the N first NP ratios do not satisfy the standard NP ratio, then the initial NP ratio is updated using a first preset optimization function, where 1≤Y≤N, 1≤M≤N; the first preset optimization function causes: the NP ratios that satisfy the standard NP ratio and are less than the initial NP ratio to be updated to NP ratios with a smaller difference from the standard NP ratio, or the initial NP ratios that do not satisfy the standard NP ratio to NP ratios that satisfy the standard NP ratio; the formula for the first preset optimization function is: updated initial NP ratio = initial NP ratio / minimum value among the N first NP ratios; Based on the comparison results, the initial NP ratio is updated using a preset optimization function, including: if the comparison results show that all N first NP ratios are greater than the initial NP ratio, then the initial NP ratio is updated using a second preset optimization function; the second preset optimization function ensures that the updated initial NP ratio is an NP ratio that satisfies the standard NP ratio and is less than the initial NP ratio; the formula for the second preset optimization function is: updated initial NP ratio = initial NP ratio × (initial NP ratio / minimum value among the N first NP ratios).

6. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method as described in any one of claims 1-4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1-4.

8. A computer program product, the computer program product comprising instructions, characterized in that, The instructions are executed by the processor to implement the method as described in any one of claims 1-4.

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