Battery cell evaluation method and device and electronic equipment

Abstract

The invention provides a battery cell evaluation method and device and electronic equipment. The method comprises the following steps: a cycle test based on high temperature aging is carried out on a plurality of test cells, test data of each test cell is obtained, and the test data comprises at least one of resistance, physical and chemical parameters, cycle index, aging time and battery state of health SOH of the test cells; establishing an evaluation database based on the test data of each test cell, wherein the evaluation database comprises a fitting relationship among different test data; and according to the real-time resistance of the to-be-evaluated battery cell, determining the SOH of the to-be-evaluated battery cell from the evaluation database. The relationship between the material and the performance can be established, and the cell evaluation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of new energy, and in particular, to a battery cell evaluation method and device and electronic equipment. BACKGROUND

[0002] In the related art, the cycle performance of a battery cell can be evaluated by changing the charge and discharge process or dividing mutually exclusive voltage intervals to perform cycle tests, but the related art cannot establish a relationship between materials and performance, and the evaluation is time-consuming and has poor applicability. SUMMARY

[0003] The present disclosure provides a battery cell evaluation method and device and electronic equipment to solve the problems in the related art.

[0004] The first aspect of the present disclosure provides a battery cell evaluation method, which comprises: performing a cycle test based on high-temperature aging on a plurality of test battery cells, obtaining test data of each test battery cell, the test data comprising at least one of the resistance, physicochemical parameters, cycle number, aging time, and state of health (SOH) of the test battery cell; establishing an evaluation database based on the test data of each test battery cell, the evaluation database comprising a corresponding relationship between different test data; and determining the state of health (SOH) of a battery cell to be evaluated from the evaluation database according to the real-time resistance of the battery cell.

[0005] In combination with the first aspect of the present disclosure, the plurality of test battery cells comprises a first test battery cell and a second test battery cell, and the cycle test based on high-temperature aging on the plurality of test battery cells comprises: performing a cycle test on the first test battery cell to obtain the first cycle number and the first physicochemical parameters at the first cycle number of the first test battery cell; performing high-temperature aging on the second test battery cell to obtain the aging time and the second physicochemical parameters at the aging time of the second test battery cell; for each test battery cell, obtaining the voltage value and the current value of each test battery cell, and obtaining the resistance of each test battery cell corresponding to the voltage value and the current value of each test battery cell; for each test battery cell, determining the maximum cycle number of each test battery cell, and using an evaluation function to determine the state of health (SOH) of each test battery cell corresponding to the first cycle number of each test battery cell and the maximum cycle number of each test battery cell; and the test data comprises at least one of the first cycle number, the first physicochemical parameters, and the second physicochemical parameters.

[0006] With reference to the first aspect of the present disclosure, the establishing the evaluation database comprises: determining a first fitting relationship between the first cycle number and the first physicochemical parameter; determining a second fitting relationship between the aging time and the second physicochemical parameter; determining a third fitting relationship between the first cycle number, the aging time and the physicochemical parameter according to the first fitting relationship and the second fitting relationship; determining a fourth fitting relationship between the resistance of the plurality of test battery cells and the physicochemical parameter; and establishing the evaluation database according to at least one of the first fitting relationship, the second fitting relationship, the third fitting relationship and the fourth fitting relationship; wherein the evaluation database at least comprises the third fitting relationship and the fourth fitting relationship.

[0007] With reference to the first aspect of the present disclosure, the determining the third fitting relationship between the first cycle number, the aging time and the physicochemical parameter according to the first fitting relationship and the second fitting relationship comprises: determining a similarity between the first physicochemical parameter and the second physicochemical parameter; and corresponding the first fitting relationship and the second fitting relationship according to the similarity to obtain the third fitting relationship between the first cycle number, the aging time and the physicochemical parameter.

[0008] With reference to the first aspect of the present disclosure, the determining the state of health (SOH) of the battery cell to be evaluated from the evaluation database according to the real-time resistance of the battery cell to be evaluated comprises: obtaining the real-time resistance of the battery cell to be evaluated; determining, according to the fourth fitting relationship, that the physicochemical parameter corresponding to the real-time resistance of the battery cell to be evaluated is the real-time physicochemical parameter of the battery cell to be evaluated; and determining, according to the real-time physicochemical parameter of the battery cell to be evaluated, the state of health (SOH) of the battery cell to be evaluated by using the third fitting relationship.

[0009] With reference to the first aspect of the present disclosure, the determining the state of health (SOH) of the battery cell to be evaluated by using the third fitting relationship according to the real-time physicochemical parameter of the battery cell to be evaluated comprises: determining, according to the third fitting relationship, that the first cycle number corresponding to the physicochemical parameter is the second cycle number of the battery cell to be evaluated; and determining that the state of health (SOH) corresponding to the second cycle number is the state of health (SOH) of the battery cell to be evaluated.

[0010] With reference to the first aspect of the present disclosure, the method further comprises: determining a fitting accuracy between the test data and the fitting data of each test battery cell; and removing the data when the fitting accuracy of the data is less than a fitting accuracy threshold.

[0011] In a second aspect, an embodiment of the present disclosure provides an electric core evaluation device, which comprises: a first processing unit configured to perform a high-temperature aging-based cycle test on a plurality of test electric cores, and obtain test data of each test electric core, the test data comprising at least one of an electrical resistance, a physicochemical parameter, a cycle number, an aging time, and a state of health (SOH) of the test electric core; a second processing unit configured to establish an evaluation database based on the test data of each test electric core, the evaluation database comprising a corresponding relationship between different test data; and a third processing unit configured to determine a state of health (SOH) of a to-be-evaluated electric core from the evaluation database according to a real-time electrical resistance of the to-be-evaluated electric core.

[0012] In a third aspect, an embodiment of the present disclosure provides an electronic device, which comprises: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method of any one of the first aspect embodiments of the present disclosure.

[0013] In a fourth aspect, an embodiment of the present disclosure provides a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable a computer to perform the method of the first aspect embodiments of the present disclosure.

[0014] In a fifth aspect, an embodiment of the present disclosure provides a chip, which comprises at least one processor and a communication interface; the communication interface is configured to receive a signal input into the chip or output a signal from the chip, and the processor is in communication with the communication interface and implements the method of any one of the first aspect embodiments of the present disclosure through a logic circuit or an execution of code instructions.

[0015] In summary, according to the electric core evaluation method provided by the present disclosure, the test efficiency of the cycle performance can be improved by performing a high-temperature aging-based cycle test on the test electric cores; the evaluation database can be established based on the test results, the association between the materials and the performance can be established, and the state of health of the battery can be quickly determined based on the evaluation database, thereby realizing the rapid evaluation of the electric cores.

[0016] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure, and do not constitute an improper limitation of the present disclosure.

[0018] Figure 1 FIG. 1 is a flowchart of an electric core evaluation method according to an embodiment of the present disclosure;

[0019] Figure 2 A flowchart of an electric cell evaluation method according to an embodiment of the present disclosure is shown in FIG. 1.

[0020] Figure 3 A flowchart of an electric cell evaluation method according to an embodiment of the present disclosure is shown in FIG. 1.

[0021] Figure 4 A flowchart of an electric cell evaluation method according to an embodiment of the present disclosure is shown in FIG. 1.

[0022] Figure 5 A flowchart of a rapid evaluation method of SOH of an electric cell according to an embodiment of the present disclosure is shown in FIG. 2.

[0023] Figure 6 A structural diagram of an electric cell evaluation device according to an embodiment of the present disclosure is shown in FIG. 3.

[0024] Figure 7 A block diagram of an electronic device according to an example embodiment is shown in FIG. 4.

[0025] Figure 8 A structural diagram of a chip according to an embodiment of the present disclosure is shown in FIG. 5. DETAILED DESCRIPTION

[0026] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations identify the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present disclosure, and cannot be understood as a limitation of the present disclosure.

[0027] In actual applications, in order to manage the electric cell, it is usually necessary to obtain the state of the electric cell and the cycle performance of the electric cell, such as the state of health (SOH) of the electric cell, the cycle performance of the electric cell, and the like. Related technologies can obtain the cycle life, i.e., the maximum number of cycles, of the electric cell by performing cycle tests on the electric cell, but this method consumes a lot of time. In order to solve this problem, related technologies propose a method for accelerated evaluation of the cycle performance of the electric cell.

[0028] Method one: related technologies can perform accelerated evaluation of cycle performance by changing the charging and discharging process. This method cannot associate materials and performance, but different materials have different possibilities, so this method has poor applicability after the material is replaced.

[0029] Method two: related technologies can perform cycle tests by dividing mutually exclusive voltage intervals, and then obtain the cycle performance in the full voltage range, but this method will cause differences between the final results and the actual situation when data anomalies occur in a single interval, and cannot ensure accuracy.

[0030] Therefore, aiming at the above problems, the present disclosure proposes an electrode evaluation method, which can measure the certain physicochemical properties of the pole piece under different cycle numbers, build a database of silicon negative electrode cycle attenuation, and establish the relationship between materials and performance. And it can simulate the cycle attenuation of the silicon negative electrode by high temperature aging combined with the swelling behavior of the negative electrode in the electrolyte, thereby improving the rate of electrode evaluation.

[0031] In addition, the method can quantitatively evaluate the certain physicochemical properties of the pole piece under different high-temperature aging times and different cycle numbers, obtain the correlation between the two through curve fitting, and effectively identify abnormal data. In addition, the method can build an electrode SOH evaluation database through preliminary experiments, collect real-time voltage (V) and current data (I) of the electrode through the battery management system, and quickly and accurately evaluate the SOH of the electrode through the correlation between the resistance (R) and the certain physicochemical properties of the pole piece.

[0032] The electrode evaluation method provided by the present disclosure will be described in detail below with reference to the accompanying drawings.

[0033] Figure 1 A flowchart of an electrode evaluation method according to an embodiment of the present disclosure is shown in FIG. 1. As shown in the embodiment, the method comprises the following steps. Figure 1

[0034] Step 101, performing a cycle test based on high-temperature aging on a plurality of test electrodes to obtain test data of each test electrode.

[0035] In some embodiments, the test data includes at least one of the resistance, physicochemical parameters, cycle number, aging time, and state of health SOH of the test electrode.

[0036] In the above embodiment, for example, the resistance of the electrode can be obtained according to the voltage and current of the electrode.

[0037] In the above embodiment, for example, the physicochemical parameters can be negative pole piece peeling force, film resistance, etc., or other physicochemical properties of the electrode or the negative pole piece of the electrode, which are quantified. The present disclosure is not limited in this regard.

[0038] In the above embodiment, the cycle number can be the number of charging and discharging of the electrode. For example, one charging and discharging of the electrode can be regarded as one cycle.

[0039] In the above embodiment, the aging time can be the time for high-temperature aging of the negative pole piece of the electrode, for example, 7 days, 14 days, etc.

[0040] In the above embodiment, the state of health SOH of the battery can be used to represent the remaining life of the battery, which can represent the remaining life of the electrode in the present solution. ​

[0041] In some embodiments, a plurality of test batteries can be prepared, and the plurality of test batteries can be charged and discharged, i.e., cycled. After a certain number of cycles, the test batteries can be disassembled to obtain negative plates of the test batteries, and the negative plates of the test batteries can be tested to obtain relevant test data. The certain number of cycles can be 100, 200, etc. That is, the data can be obtained by disassembling the batteries after 100 cycles, and then the data can be obtained by disassembling the batteries after another 100 cycles, and the number of cycles of the batteries can be 200. Alternatively, a plurality of test batteries can be cycled for different numbers of cycles. For example, the data can be obtained by disassembling the batteries after 100 cycles of battery A, and then the data can be obtained by disassembling the batteries after 200 cycles of battery B. At this time, batteries A and B are two identical batteries.

[0042] In the above embodiments, the cycling method of the battery and the specific number of cycles can be specified according to actual needs, and the present disclosure is not limited in this regard.

[0043] In some embodiments, the high-temperature aging can simulate the cycle test process. For example, a plurality of negative plates of batteries that have not been cycled can be prepared and soaked in electrolyte, and the temperature can be set at a suitable temperature that does not change the negative plate attenuation mechanism to age the negative plates at high temperature.

[0044] In some embodiments, the high-temperature aging can be selected according to the Arrhenius equation to simulate the structural aging in the cycle under the premise of not changing the cycle attenuation mechanism, and the cycle attenuation of the negative plate can be simulated in combination with the swelling behavior of the negative plate in the electrolyte, wherein the swelling behavior can simulate the volume expansion in the cycle.

[0045] In the above embodiments, the negative plates can be tested to obtain test data after a certain aging time. For example, the negative plates can be tested after seven days of high-temperature aging, and then the negative plates can be tested again after another seven days of high-temperature aging, and the high-temperature aging time of the negative plates is fourteen days. Alternatively, the negative plates of a plurality of test batteries can be high-temperature aged for different times. For example, the negative plates of test battery A can be high-temperature aged for seven days and tested, while the negative plates of test battery B can be high-temperature aged for fourteen days and tested. At this time, the negative plates of test battery A and the negative plates of test battery B are two identical negative plates.

[0046] In the above embodiments, the high-temperature aging method and the specific high-temperature aging time can be specified according to actual conditions, and the present disclosure is not limited in this regard.

[0047] In step 102, an evaluation database is established based on the test data of each test battery, and the evaluation database includes a fitting relationship between different test data.

[0048] In some embodiments, an evaluation database can be established based on the test data of each test battery cell.

[0049] In some embodiments, a correspondence between the test data can be determined, and the evaluation database can be established according to the correspondence between the test data.

[0050] In the above embodiments, for example, a correspondence between the cycle number and the physicochemical parameter, a correspondence between the aging time and the physicochemical parameter, a correspondence between the cycle number, the aging time and the physicochemical parameter, a correspondence between the resistance and the physicochemical parameter, and the like can be determined.

[0051] For example, the cycle number can include a current cycle number and a maximum cycle number, and a correspondence between the cycle number and the state of health SOH of the battery can be determined by using an evaluation function, for example, the evaluation function can be The correspondence between the cycle number and the state of health SOH of the battery determined based on the formula can be, for example, when the cycle number is 100, the corresponding state of health SOH of the battery can be 97%.

[0052] In the above embodiments, the correspondence of the test data included in the evaluation database can also be a correspondence between other test data, and the present disclosure is not limited in this regard.

[0053] In step 103, the state of health SOH of the battery cell to be evaluated is determined from the evaluation database according to the real-time resistance of the battery cell to be evaluated.

[0054] In some embodiments, the real-time resistance of the battery cell to be evaluated can be determined first, and then the real-time physicochemical parameter of the battery cell to be evaluated can be determined according to the correspondence between the resistance and the physicochemical parameter in the evaluation database. For example, the real-time resistance of the battery cell to be evaluated can be obtained first, and then the real-time physicochemical parameter of the battery cell can be determined according to the real-time resistance of the battery cell.

[0055] In some embodiments, the cycle number of the battery cell to be evaluated can be determined according to the real-time physicochemical parameter of the battery cell, and the state of health SOH of the battery cell to be evaluated can be determined according to the correspondence between the cycle number and the state of health SOH of the battery.

[0056] In summary, the above embodiments of the present disclosure can perform high-temperature aging cycle tests on test battery cells, can improve the speed of the cycle tests, can establish an evaluation database by obtaining test data of the cycle tests and determining a correspondence between the test data, can establish a correspondence between the material and the performance, and can determine the state of health SOH of the battery cell according to the evaluation database to achieve rapid evaluation of the battery cell.

[0057] Figure 2 A flowchart of an electric cell evaluation method according to an embodiment of the present disclosure is shown. Based on the embodiment shown in FIG. 1, the method comprises the following steps: Figure 2 The embodiment shown in FIG. 2 is a further illustration of step 102 of the embodiment shown in FIG. 1, comprising the following steps: Figure 2 The embodiment shown in FIG. 2 is a further illustration of step 102 of the embodiment shown in FIG. 1, comprising the following steps: Figure 1 The embodiment shown in FIG. 2 is a further illustration of step 102 of the embodiment shown in FIG. 1, comprising the following steps:

[0058] Step 201, performing a cycle test on the first test electric cell to obtain a first cycle number of the first test electric cell and a first physicochemical parameter of the first test electric cell at the first cycle number.

[0059] In some embodiments, the test electric cells can comprise the first test electric cells and the second test electric cells, the first test electric cells can be the test electric cells used for performing the cycle test, and the second test electric cells can be the test electric cells used for performing the high-temperature aging test. At least one first test electric cell and at least one second test electric cell can be tested to obtain test data.

[0060] For example, the first physicochemical parameter can be a peel force, a membrane resistance, etc., or other physicochemical parameters of the electric cell, or a physicochemical parameter of the negative plate of the electric cell, etc., which are not limited by the present disclosure.

[0061] In some embodiments, a plurality of first test electric cells in the electric cell test set can be subjected to a cycle test. The process is the same as the charging and discharging of the plurality of test electric cells in step 101. For example, the first test electric cell can be charged and discharged, i.e., cycled. After a certain number of cycles, the first test electric cell is disassembled to obtain the negative plate of the first test electric cell, and the negative plate of the first test electric cell is tested to obtain relevant test data.

[0062] In some embodiments, the test data can be the respective first physicochemical parameters of the negative plate of the first test electric cell at a plurality of first cycle numbers, for example, the peel force of the negative plate of the first test electric cell at 100 cycles can be tested, the peel force of the negative plate of the first test electric cell at 200 cycles can be tested, etc.

[0063] In some embodiments, a first fitting relationship between the plurality of first cycle numbers and the respective first physicochemical parameters at the plurality of first cycle numbers can be determined according to the cycle test, and a first fitting curve can be determined according to the first fitting relationship.

[0064] In the above embodiment, the specific form of the first fitting relationship can be determined according to actual conditions, for example, it can be an exponential relationship, a power relationship, etc., which are not limited by the present disclosure.

[0065] Step 202, performing a high-temperature aging treatment on the second test electric cell to obtain an aging time of the second test electric cell and a second physicochemical parameter of the second test electric cell at the aging time.

[0066] For example, the second physicochemical parameter can be a peel force, a film resistance, or other physicochemical parameters of the negative tab of the other battery cell, which are not limited in the present disclosure.

[0067] In some embodiments, the negative tab of the plurality of second test battery cells in the battery cell test set can be subjected to a high-temperature aging process, which is the same process as the high-temperature aging process in step 101. For example, a high-temperature aging simulation cycle test process can be performed on the second test battery cells. For example, a plurality of uncycled negative tabs of battery cells can be soaked in electrolyte, the temperature can be set to a suitable temperature that does not change the negative tab degradation mechanism, the negative tabs can be subjected to high-temperature aging, and test data of the negative tab of the second test battery cell at a plurality of aging times can be obtained.

[0068] The test data can be the second physicochemical parameter of the negative tab of the second test battery cell at a plurality of aging times, for example, the peel force of the negative tab of the second test battery cell after seven days of high-temperature aging, the peel force of the negative tab of the second test battery cell after fourteen days of high-temperature aging, and so on.

[0069] In the above embodiments, the first test battery cell and the second test battery cell are both uncycled test battery cells.

[0070] In some embodiments, a second fitting relationship between the plurality of aging times and the second physicochemical parameter corresponding to each of the plurality of aging times can be determined according to the high-temperature aging process described above. The second fitting curve can be determined according to the second fitting relationship.

[0071] In the above embodiments, the specific form of the second fitting relationship can be determined according to actual conditions, for example, it can be an exponential relationship, a power relationship, and so on, which are not limited in the present disclosure.

[0072] In some embodiments, a third fitting relationship between the plurality of first cycle times, the plurality of aging times, and the plurality of physicochemical parameters can be determined. For example, the third fitting relationship can be determined according to the first fitting relationship and the second fitting relationship, for example, the first fitting relationship and the second fitting relationship can be corresponded according to the similarity between the first physicochemical parameter and the second physicochemical parameter to obtain the third fitting relationship. In addition, a third fitting curve can be determined according to the third fitting relationship.

[0073] In the above embodiments, the specific form of the third fitting relationship can be determined according to actual conditions, for example, it can be an exponential relationship, a power relationship, and so on, which are not limited in the present disclosure.

[0074] In step 203, for each test battery cell, the voltage value and the current value of each test battery cell are obtained, and the resistance of each test battery cell corresponding to the voltage value and the current value of each test battery cell is obtained.

[0075] In some embodiments, the plurality of voltage values and the plurality of current values of the plurality of test battery cells can be determined, for example, a cycle test can be performed on the test battery cell, when the cycle number of the battery cell is 100, the voltage value and the current value of the test battery cell are obtained; when the cycle number of the battery cell is 200, the voltage value and the current value of the test battery cell are obtained again.

[0076] In the above embodiments, the voltage value and the current value of the same test battery cell at different cycle numbers can be obtained; or the voltage value and the current value of a plurality of same test battery cells at different cycle numbers can be obtained, for example, after the cycle number of A battery cell is 100, the voltage value and the current value of A battery cell are obtained, after the cycle number of B battery cell is 200, the voltage value and the current value of B battery cell are obtained, and the present disclosure is not limited thereto.

[0077] In some embodiments, the resistance value of the battery cell can be determined according to the formula wherein R is the resistance value of the test battery cell, V is the voltage value of the test battery cell, and I is the current value of the test battery cell.

[0078] In the above embodiments, the resistance value of the test battery cell at the current cycle number and the physicochemical parameter can be obtained, so as to determine a fourth fitting relationship between the resistance of the plurality of battery cells and the plurality of physicochemical parameters, for example, when the test battery cell is cycled 100 times, the physicochemical parameter and the voltage and current value of the test battery cell are obtained, and the resistance value of the test battery cell is determined according to the voltage and current value.

[0079] For example, the fourth fitting curve can be determined according to the fourth fitting relationship.

[0080] In the above embodiments, the specific form of the fourth fitting relationship can be determined according to actual conditions, for example, it can be an exponential relationship, a power relationship, etc., and the present disclosure is not limited thereto.

[0081] In some embodiments, the evaluation database can be established according to at least one of the first fitting relationship, the second fitting relationship, the third fitting relationship, and the fourth fitting relationship.

[0082] In step 204, for each test battery cell, the maximum cycle number of each test battery cell is determined, and according to the first cycle number and the maximum cycle number of each test battery cell, an evaluation function is used to determine the state of health SOH of each test battery cell corresponding to the first cycle number.

[0083] In some embodiments, the maximum cycle number of the battery cell can be obtained according to the material of the battery cell, for example, cycle tests can be performed on battery cells of different materials to determine the maximum cycle number of each material.

[0084] In some embodiments, the first cycle number of the test battery cell can be obtained according to the resistance of the test battery cell, and after the maximum cycle number is obtained, the battery health state SOH of the test battery cell at the first cycle number can be determined according to the evaluation function. determining the battery health state SOH of the test battery cell at the first cycle number.

[0085] For example, one test battery cell can have a corresponding battery health state at different cycle numbers.

[0086] In some embodiments, the fitting data can be determined according to the fitting curve, and the fitting accuracy between the test data and the fitting data of each test battery cell can be determined. For example, the first fitting curve is the fitting relationship between the first cycle number and the first physicochemical parameter, and the test data is the first cycle number and the first physicochemical parameter obtained through the above cycle test. The fitting data can be obtained according to the first fitting curve, and the fitting physicochemical parameter corresponding to the first cycle number on the fitting curve. For example, the first cycle number is 100, and the first physicochemical parameter is 5.01. After fitting according to the test data, the fitting physicochemical parameter corresponding to the first cycle number on the fitting curve is 5, and the fitting parameter 5 is the fitting data at this time.

[0087] In the above embodiments, the fitting accuracy between the fitting data and the test data can be determined

[0088] In some embodiments, when the fitting accuracy between the fitting data and the test data is less than the fitting accuracy threshold, it indicates that the test data is poorly fitted with other data, and the data may be abnormal, so the data can be excluded to ensure that the fitting result is not affected by abnormal data.

[0089] In summary, the test data can be determined through cycle testing and high-temperature aging, which can improve the cycle testing rate of the battery cell, and the corresponding relationship between the test data can be determined, a database can be established through the relationship, and the relationship between the material and the performance can be established. Through the fitting curve, abnormal data points can be quickly located and abnormal data can be processed, so that the database is not affected by abnormal data.

[0090] Figure 3 A flowchart of an embodiment of a battery cell evaluation method of the present disclosure. Based on Figure 3 the embodiment shown, Figure 3 is a further description of step 203 of Figure 2 , including the following steps:

[0091] Step 301, determining the similarity between the first physicochemical parameter and the second physicochemical parameter.

[0092] In some embodiments, for example, the similarity between the first physicochemical parameter and the second physicochemical parameter can be the closeness of the quantitative data. For example, the first physicochemical parameter can be a diaphragm resistance value of 5.2, and the second physicochemical parameter can be a diaphragm resistance value of 5.25. At this time, the difference between the first physicochemical parameter and the second physicochemical parameter is 0.05, which can be used as the similarity.

[0093] In the above embodiments, for example, the higher the similarity between the first physicochemical parameter and the second physicochemical parameter, the closer the physicochemical properties between the negative pole of the first test battery and the negative pole of the second test battery.

[0094] In the above embodiments, for example, the similarity between the first physicochemical parameter and the second physicochemical parameter can be determined by other methods, and the present disclosure is not limited thereto.

[0095] Step 302, according to the similarity, corresponding the first fitting relationship and the second fitting relationship to obtain a third fitting relationship between the first cycle number, the aging time and the physicochemical parameter.

[0096] In some embodiments, for example, when the similarity between the first physicochemical parameter and the second physicochemical parameter is higher than the similarity threshold, it can be indicated that the data corresponding to the first physicochemical parameter and the data corresponding to the second physicochemical parameter are in a corresponding relationship.

[0097] For example, in the first fitting relationship, the first physicochemical parameter is 5.19, and the corresponding first cycle number is 100. In the second fitting relationship, the second physicochemical parameter is 5.02, and the corresponding aging time is 7 days. When the similarity threshold is 1, the first physicochemical parameter and the second physicochemical parameter can be considered as the same physicochemical parameter. At this time, the physicochemical parameter and the first cycle number 100 and the aging time 7 days are in a corresponding relationship, indicating that under the physicochemical parameter, the aging time is 7 days or the cycle number is 100.

[0098] In the above embodiments, the third fitting relationship can be determined according to the corresponding relationship between the physicochemical parameter, the first cycle number and the aging time, and the third fitting curve can be determined according to the third fitting relationship.

[0099] In summary, the third fitting relationship can be determined through the first fitting relationship and the second fitting relationship, the corresponding relationship between the test data can be established, which can facilitate the subsequent establishment of the evaluation database. By corresponding the test data of high-temperature aging and the data of cycle test, the cycle test speed can be improved while the accuracy of the test data is improved.

[0100] Figure 4A flowchart of an electric cell evaluation method according to an embodiment of the present disclosure. Based on Figure 1 The embodiment shown further explains and describes step 103, including the following steps:

[0101] Step 401: Obtain the real-time resistance of the electric cell to be evaluated.

[0102] In some embodiments, the real-time resistance of the electric cell to be evaluated can be determined by obtaining the real-time voltage value and the real-time current value of the electric cell to be evaluated, according to the formula wherein R is the real-time resistance of the electric cell to be evaluated, V is the real-time voltage value of the electric cell to be evaluated, and I is the real-time current value of the electric cell to be evaluated.

[0103] Step 402: According to the fourth fitting relationship, the real-time physicochemical parameter corresponding to the real-time resistance of the electric cell to be evaluated is determined as the real-time physicochemical parameter of the electric cell to be evaluated.

[0104] In some embodiments, according to the fourth fitting relationship, the real-time physicochemical parameter corresponding to the real-time resistance of the electric cell to be evaluated can be determined, which is the real-time physicochemical parameter of the negative plate of the electric cell to be evaluated under the real-time resistance.

[0105] Step 403: According to the real-time physicochemical parameter of the electric cell to be evaluated, the third fitting relationship is used to determine the state of health SOH of the electric cell to be evaluated.

[0106] In some embodiments, according to the third fitting relationship, the first cycle number corresponding to the physicochemical parameter can be determined as the second cycle number of the electric cell to be evaluated.

[0107] In some embodiments, for example, the second cycle number can be the current cycle number of the electric cell to be evaluated.

[0108] In some embodiments, the real-time physicochemical parameter corresponding to the real-time resistance of the electric cell to be evaluated can be determined according to the fourth fitting relationship.

[0109] In some embodiments, the first cycle number corresponding to the above-mentioned physicochemical parameter can be determined as the second cycle number of the electric cell to be evaluated according to the third fitting relationship. For example, when the resistance of the test electric cell is 0.246, the corresponding physicochemical parameter is 5.01, at this time, the first cycle number corresponding to the physicochemical parameter 5.01 is 100 times, which means that when the cycle number is 100 times, the physicochemical property of the corresponding electric cell is 5.01, then when the electric cell resistance is 0.246, it means that the electric cell to be evaluated has been cycled for 100 times, that is, the current cycle number of the electric cell to be evaluated is 100.

[0110] In some embodiments, the state of health SOH corresponding to the second cycle number can be determined as the state of health SOH of the electric cell to be evaluated.

[0111] In other words, the battery state of health SOH corresponding to the test battery with the same cycle number as the battery to be evaluated can be determined from the database, and the battery state of health SOH corresponding to the test battery is the battery state of health SOH of the battery to be evaluated.

[0112] In summary, by determining the real-time resistance value of the battery to be evaluated, and using the fourth fitting relationship of the evaluation database, the real-time physicochemical parameters of the battery to be evaluated can be determined, which facilitates the determination of the battery state of health SOH of the battery to be evaluated based on the real-time physicochemical parameters, and the rapid evaluation of the battery can be realized by using the relationship between materials and performance.

[0113] Next, through an example, the above-mentioned scheme proposed by the present disclosure is further described.

[0114] The present example proposes a rapid evaluation method for battery SOH, which can realize accelerated cycle life test without affecting the decay mechanism, and based on this, rapid establishment of a battery SOH evaluation database and rapid evaluation of battery SOH can be realized. The method flow is as shown in Figure 5 The specific content of the method is as follows.

[0115] 1. Prepare several batteries for cycle test. After a certain number of cycles (100, 200, 300, 400…), disassemble the battery to obtain the negative plate after the corresponding cycle number.

[0116] 2. Test the physicochemical properties (such as peel strength, membrane resistance, etc.) of these plates, and use the quantified data to fit with the cycle number to obtain the fitting curve equation 1. The quantification standard of physicochemical properties includes but is not limited to absolute value, relative value, change rate, etc.

[0117] 3. Soak the negative plate that has not been cycled in electrolyte, and set the temperature at a suitable temperature that does not change its decay mechanism, and perform high-temperature aging on the negative plate. After a certain high-temperature aging time (7 days, 14 days, 21 days, 28 days…), test the same physicochemical properties of these plates, and use the quantified data to fit with the high-temperature aging time to obtain the fitting curve equation 2.

[0118] 4. Use physicochemical properties as a bridge to obtain the fitting curve equation 3 between cycle number and high-temperature aging time, and physicochemical properties.

[0119] 5. Under the premise that the decay mechanism does not change, by measuring the data of the physicochemical properties at a certain high-temperature aging time, the actual cycle capability of the material can be quickly evaluated, and based on this, a battery SOH evaluation database can be quickly established.

[0120] 6. Collect the voltage (V) and current (I) data of the battery cell during the charging process through the BMS system, and correlate the real-time resistance (R = V / I) with the negative electrode physicochemical properties to obtain the correlation equation 4 of the real-time resistance and the negative electrode physicochemical parameters.

[0121] 7. Finally, based on the evaluation database of a specific system, the SOH of the battery cell is quickly and accurately evaluated according to the real-time resistance (R) of the battery cell.

[0122] In summary, the above-mentioned method of the present example can take the actual physicochemical properties of the silicon negative electrode as the starting point. In the case of sufficient data, a database is constructed to obtain a more accurate fitting equation, and the correlation between the material and the performance is established. Under the premise that the silicon negative electrode system and the degradation mechanism remain unchanged, the cycle life of the battery cell can be quickly evaluated. The present application can quickly locate abnormal data points and exclude abnormal data points, so that the final result is not affected by abnormal data, and the accuracy of the cycle life prediction is improved. The time of life evaluation can be greatly shortened, and the time span can be shortened from years to months. An evaluation database can be quickly established for a certain system.

[0123] Corresponding to the method provided by the above-mentioned several embodiments, the present disclosure also provides a battery cell evaluation device. Since the device provided by the embodiments of the present disclosure corresponds to the method provided by the above-mentioned several embodiments, the implementation of the method is also applicable to the device provided by the present embodiment. In the present embodiment, it will not be described in detail.

[0124] Figure 6 A structural schematic diagram of a battery cell evaluation device 600 according to an embodiment of the present disclosure. As shown in the figure, the battery cell evaluation device includes: Figure 6

[0125] A first processing unit 610 performs a cycle test based on high-temperature aging on a plurality of test battery cells, and obtains test data of each test battery cell, the test data including at least one of the resistance, physicochemical parameters, cycle number, aging time, and battery state of health SOH of the test battery cell; a second processing unit 620 is configured to establish an evaluation database based on the test data of each test battery cell, the evaluation database including a corresponding relationship between different test data; and a third processing unit 630 is configured to determine the battery state of health SOH of the battery cell to be evaluated from the evaluation database according to the real-time resistance of the battery cell to be evaluated.

[0126] ​In some embodiments, the first processing unit 610 can also be configured to perform a cycle test on the first test battery cell to obtain a first cycle number of the first test battery cell and a first physicochemical parameter at the first cycle number; perform a high-temperature aging process on the second test battery cell to obtain an aging time of the second test battery cell and a second physicochemical parameter at the aging time; for each test battery cell, obtain a voltage value and a current value of each test battery cell, and according to the voltage value and the current value of each test battery cell, obtain a respective resistance of each test battery cell corresponding to the voltage value and the current value; for each test battery cell, determine a respective maximum cycle number of each test battery cell, and according to the respective first cycle number and the maximum cycle number of each test battery cell, determine a respective state of health (SOH) of each test battery cell at the first cycle number using an evaluation function; wherein the test data includes at least one of the first cycle number, the first physicochemical parameter, and the second physicochemical parameter.

[0127] In some embodiments, the second processing unit 620 can also be configured to determine a first fitting relationship between the first cycle number and the first physicochemical parameter at the first cycle number; determine a second fitting relationship between the aging time and the second physicochemical parameter at the aging time; determine a third fitting relationship between the first cycle number, the aging time, and the physicochemical parameter according to the first fitting relationship and the second fitting relationship; determine a fourth fitting relationship between the resistance of the test battery cell and the physicochemical parameter; and wherein the evaluation database includes at least the third fitting relationship and the fourth fitting relationship.

[0128] In some embodiments, the second processing unit 620 can also be configured to determine a similarity between the first physicochemical parameter and the second physicochemical parameter; and according to the similarity, correspond the first fitting relationship to the second fitting relationship to obtain the third fitting relationship between the first cycle number, the aging time, and the physicochemical parameter.

[0129] In some embodiments, the third processing unit 630 can also be configured to obtain a real-time resistance of the battery cell to be evaluated; determine, according to the fourth fitting relationship, that the physicochemical parameter corresponding to the real-time resistance of the battery cell to be evaluated is a real-time physicochemical parameter of the battery cell to be evaluated; and determine, according to the real-time physicochemical parameter of the battery cell to be evaluated, the state of health (SOH) of the battery cell to be evaluated using the third fitting relationship.

[0130] In some embodiments, the third processing unit 630 can also be configured to determine, according to the third fitting relationship, that the first cycle number corresponding to the physicochemical parameter is a second cycle number of the battery cell to be evaluated; and determine that the state of health (SOH) corresponding to the second cycle number is the state of health (SOH) of the battery cell to be evaluated.

[0131] In some embodiments, the battery cell evaluation device 600 further comprises a fourth processing unit configured to determine fitting accuracy between the test data of each test battery cell and the fitting data; and discard the data when the fitting accuracy of the data is less than a fitting accuracy threshold.

[0132] In summary, the battery cell evaluation device 600 can accelerate the establishment of the evaluation database, establish the relationship between the material and the performance, and realize the accelerated evaluation of the battery cell by performing the cycle test and the high-temperature aging test on the test battery cell to obtain the test data and establish the evaluation database, evaluating the battery cell to be evaluated based on the evaluation database, and discarding the abnormal data to ensure that the evaluation result is not affected by the abnormal data and the accuracy of the battery cell evaluation is ensured.

[0133] In the above embodiments of the present disclosure, the method and device provided by the embodiments of the present disclosure are introduced. In order to realize the functions of the above method provided by the embodiments of the present disclosure, the electronic device can include a hardware structure, a software module, and the above functions can be realized in the form of hardware structure, software module, or hardware structure plus software module. Some of the above functions can be executed in the form of hardware structure, software module, or hardware structure plus software module.

[0134] Figure 7 is a block diagram of an electronic device 700 for implementing the above method according to an exemplary embodiment.

[0135] For example, the electronic device 700 can be a mobile phone, a computer, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.

[0136] Referring to Figure 7 , the electronic device 700 can include one or more of the following components: a processing component 702, a memory 704, a power supply component 706, a multimedia component 708, an audio component 710, an input / output (I / O) interface 712, a sensor component 714, and a communication component 716.

[0137] The processing component 702 usually controls the overall operation of the electronic device 700, such as operations associated with displaying, making phone calls, data communications, camera operations, and recording operations. The processing component 702 can include one or more processors 720 to execute instructions to complete all or part of the steps of the above method. In addition, the processing component 702 can include one or more modules to facilitate interaction between the processing component 702 and other components. For example, the processing component 702 can include a multimedia module to facilitate interaction between the multimedia component 708 and the processing component 702.

[0138] The memory 704 is configured to store various types of data to support the operation of the electronic device 700. Examples of such data include instructions for any application or method operating on the electronic device 700, contact data, phonebook data, messages, pictures, videos, and the like. The memory 704 can be implemented by any type of volatile or nonvolatile memory, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disc, or optical disc.

[0139] The power supply component 706 supplies power to the various components of the electronic device 700. The power supply component 706 can include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the electronic device 700.

[0140] The multimedia component 708 includes a screen providing an output interface between the electronic device 700 and a user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense a touch, a slide, and a gesture on the touch panel. The touch sensor can not only sense a boundary of a touching or a sliding action, but also detect duration and pressure related to the touching or sliding action. In some embodiments, the multimedia component 708 includes a front camera and / or a back camera. The front camera and / or the back camera can receive external multimedia data when the electronic device 700 is in an operation mode, such as a photographing mode or a video mode. Each of the front camera and the back camera can be a fixed optical lens system or have a focal length and optical zoom capability.

[0141] The audio component 710 is configured to output and / or input an audio signal. For example, the audio component 710 includes a microphone (MIC) configured to receive an external audio signal when the electronic device 700 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 704 or transmitted via the communication component 716. In some embodiments, the audio component 710 also includes a speaker for outputting an audio signal.

[0142] The I / O interface 712 provides an interface between the processing component 702 and peripheral interface modules, which can be a keyboard, a click wheel, a button, and the like. The buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0143] The sensor component 714 includes one or more sensors for providing status assessments for various aspects of the electronic device 700. For example, the sensor component 714 can detect an open / closed position of the electronic device 700, relative positioning of components, such as a display and a keypad of the electronic device 700, a change in position of the electronic device 700 or a component of the electronic device 700, presence or absence of user contact with the electronic device 700, orientation or acceleration / deceleration / g-force and temperature of the electronic device 700. The sensor component 714 can include an optical sensor for detecting ambient light, a proximity sensor configured to detect proximity of an object, a motion sensor configured to detect motion of the electronic device 700, a position sensor configured to detect position of the electronic device 700, a temperature sensor configured to detect temperature of the electronic device 700, an acceleration sensor configured to detect acceleration of the electronic device 700, a gyroscope sensor configured to detect orientation of the electronic device 700, a magnetic sensor configured to detect magnetic field intensity, a pressure sensor configured to detect pressure, or a chemical sensor configured to detect a chemical.

[0144] The communication component 716 is configured to facilitate wired or wireless communication between the electronic device 700 and other devices. The electronic device 700 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, 4G LTE, 5G NR (New Radio), or a combination thereof. In an example embodiment, the communication component 716 receives broadcast signals or broadcast-related information from an external broadcasting management system via a broadcast channel. In an example embodiment, the communication component 716 can further include a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technology.

[0145] In an example embodiment, the electronic device 700 can be implemented using one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic elements, for performing the above-described methods.

[0146] In an example embodiment, a non-transitory computer-readable storage medium including instructions, such as the memory 704 including the instructions, is also provided, which can be executed by the processor 720 of the electronic device 700 to complete the above-described methods. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disc, and an optical data storage device, etc.

[0147] The embodiment of the present disclosure also provides a non-transitory computer readable storage medium storing computer instructions, wherein the computer instructions are used to make a computer execute the method described in the above embodiment of the present disclosure.

[0148] The embodiment of the present disclosure also provides a computer program product comprising a computer program, wherein the computer program is used to make a processor execute the method described in the above embodiment of the present disclosure.

[0149] Figure 8 Fig. 8 is a structural schematic diagram of a chip 800 for implementing the above method according to an exemplary embodiment.

[0150] With reference to Figure 8 The chip 800 comprises at least one communication interface 801 and a processor 802; the communication interface 801 is used to receive a signal input into the chip 800 or output a signal from the chip 800, and the processor 802 is in communication with the communication interface 801 and implements the method described in the above embodiment through a logic circuit or executes a code instruction.

[0151] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present disclosure. Rather, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0152] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0153] Any processes or methods described in the flowcharts or otherwise described herein can be understood as representing code modules, segments, or portions of code which include one or more executable instructions for implementing specific logic functions (or steps) of the processes. The various embodiments of the present disclosure can include additional or fewer steps or processes, and the order of the steps or processes can be altered, as will be appreciated by those skilled in the art, as the described embodiments of the present disclosure can be implemented in a variety of ways.

[0154] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be embodied in non-transitory computer-readable media, which can be executed by an instruction execution system, apparatus, or device, such as a computer-based system, a processor- based system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For purposes of this specification, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The computer-readable medium can be a computer- readable storage medium or a computer-readable communication medium. The computer-readable storage medium can be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include the following: an electrical connection having one or more wires (conventional or integrated circuits), a portable computer diskette (magnetic), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, and a portable compact disc read-only memory (CDROM), and the like. Note that the computer-readable medium can even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, for example via optical scanning of the paper or other medium, then compiled, interpreted, or otherwise processed in a suitable manner, if necessary, and stored in a computer memory.

[0155] It should be understood that aspects of the embodiments of the present disclosure can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, various steps or methods can be implemented in software or firmware which are stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following technologies, known in the art, or their combinations can be used: discrete logic circuitry having logic gates for implementing logic functions upon data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0156] Those skilled in the art of the present technology can understand that all or part of the steps carried out by the above-mentioned embodiment method can be completed by a program instructing the relevant hardware, and the program can be stored in a computer readable storage medium. When the program is executed, it includes one of the steps of the method embodiment or a combination thereof.

[0157] In addition, each functional unit in various embodiments of the present disclosure can be integrated into one processing module, or each unit can exist physically independently, or two or more units can be integrated into one module. The integrated module can be realized in the form of hardware or in the form of a software functional module. If the integrated module is realized in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium. The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0158] Although the embodiments of the present disclosure have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present disclosure, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present disclosure.

Claims

1. A battery cell evaluation method, characterized in that: The method comprises, Performing a high-temperature aging cycle test on multiple test cells to obtain test data for each test cell, the test data including at least one of resistance, physical and chemical parameters, number of cycles, aging time, and battery health status (SOH) of the test cell; Establishing an evaluation database based on the test data of each test cell, wherein the evaluation database includes fitting relationships between different test data; The battery state of health (SOH) of the battery cell to be evaluated is determined from the evaluation database according to the real-time resistance of the battery cell to be evaluated.

2. The method according to claim 1, characterized in that The plurality of test cells include a first test cell and a second test cell, and performing a high temperature aging cycle test on the plurality of test cells to obtain test data of each test cell includes: Performing a cycle test on the first test cell to obtain a first cycle number and a first physical and chemical parameter of the first test cell under the first cycle number; Performing a high-temperature aging treatment on the second test cell to obtain an aging time of the second test cell and a second physical and chemical parameter under the aging time; For each test cell, obtain the voltage value and current value of each test cell, and obtain the resistance of each test cell corresponding to the voltage value and current value according to the voltage value and current value of each test cell; For each test cell, determine the maximum number of cycles of each test cell, and determine the battery state of health (SOH) corresponding to each test cell at the first number of cycles according to the first number of cycles and the maximum number of cycles of each test cell using an evaluation function; The test data includes at least one of the first cycle number, the first physical and chemical parameter, and the second physical and chemical parameter.

3. The method according to claim 2, characterized in that The establishment of the evaluation database comprises: determining a first fitting relationship between the first cycle number and a first physicochemical parameter at the first cycle number; determining a second fitting relationship between the aging time and a second physicochemical parameter at the aging time; Determining a third fitting relationship among the first number of cycles, aging time, and physical and chemical parameters based on the first fitting relationship and the second fitting relationship; Determining a fourth fitting relationship between the resistance of the test cell and the physicochemical parameter; Wherein, the evaluation database includes at least the third fitting relationship and the fourth fitting relationship.

4. The method according to claim 3, characterized in that Determining a third fitting relationship among the first number of cycles, the aging time, and the physical and chemical parameters according to the first fitting relationship and the second fitting relationship includes: determining a similarity between the first physicochemical parameter and the second physicochemical parameter; According to the similarity, the first fitting relationship and the second fitting relationship are matched to obtain a third fitting relationship between the first cycle number, aging time and physical and chemical parameters.

5. The method according to claim 3, characterized in that Determining the battery state of health (SOH) of the battery cell to be evaluated from the evaluation database according to the real-time resistance of the battery cell to be evaluated includes: Obtaining the real-time resistance of the battery cell to be evaluated; Determining, according to the fourth fitting relationship, the physical and chemical parameter corresponding to the real-time resistance of the battery cell to be evaluated as the real-time physical and chemical parameter of the battery cell to be evaluated; The state of health (SOH) of the battery cell to be evaluated is determined using the third fitting relationship according to the real-time physical and chemical parameters of the battery cell to be evaluated.

6. The method according to claim 3, characterized in that Determining the battery state of health (SOH) of the battery cell to be evaluated by using the third fitting relationship according to the real-time physical and chemical parameters of the battery cell to be evaluated includes: Determining, according to the third fitting relationship, the first cycle number corresponding to the physical and chemical parameter as the second cycle number of the battery cell to be evaluated; Determine the battery state of health (SOH) corresponding to the second cycle number as the battery state of health (SOH) of the battery cell to be evaluated.

7. The method according to claim 3, characterized in that The method further comprises: Determining the fitting accuracy between the test data and the fitting data of each test cell; When the fitting accuracy of the data is less than the fitting accuracy threshold, the data is eliminated.

8. A battery cell evaluation device, characterized in that: The device comprises: A first processing unit performs a high-temperature aging cycle test on a plurality of test cells to obtain test data of each test cell, wherein the test data includes at least one of resistance, physical and chemical parameters, number of cycles, aging time, and battery health status (SOH) of the test cell; A second processing unit is configured to establish an evaluation database based on the test data of each test cell, wherein the evaluation database includes a correspondence between different test data; The third processing unit is configured to determine the battery state of health (SOH) of the battery cell to be evaluated from the evaluation database according to the real-time resistance of the battery cell to be evaluated.

9. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium storing computer instructions, characterized in that: The computer instructions are used to cause the computer to execute the method according to any one of claims 1 to 7.

11. A chip, characterized in that: The method comprises at least one processor and a communication interface; the communication interface is used to receive a signal input to the chip or a signal output from the chip, and the processor communicates with the communication interface and implements the method according to any one of claims 1 to 7 through a logic circuit or executing code instructions.

12. A vehicle, characterized in that: Includes the battery cell evaluation device according to claim 8.

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