Methods and apparatus for screening cascaded batteries based on the consistency of electrochemical parameters

Abstract

This invention relates to the field of battery management technology, and provides a method for screening batteries for cascaded use based on the consistency of electrochemical parameters. The method includes: acquiring the voltage, current, and temperature curves of each individual cell in a battery module; identifying the electrochemical parameters of each individual cell based on these curves; and performing a horizontal comparison of the electrochemical parameters of different individual cells to screen them. This invention utilizes electrochemical parameters as an indicator of battery consistency for battery screening, enabling efficient and accurate battery selection.

Description

Technical Field

[0001] This invention relates to the field of battery management technology, and more particularly to a method and apparatus for screening batteries for reuse based on the consistency of electrochemical parameters. Background Technology

[0002] With the development of new energy sources, the demand for lithium batteries is increasing. However, due to differences in manufacturing processes and materials used by different manufacturers, the performance of lithium batteries varies. Safe use of lithium batteries is an essential prerequisite for the application of new energy sources. Different scenarios require different performance characteristics of lithium batteries, necessitating effective sorting to meet the needs of various applications.

[0003] In existing technologies, battery sorting technology mainly detects the discharge capacity after constant voltage charging, the open circuit voltage after resting, and the AC internal resistance at 1kHz. Based on the statistical distribution of these three parameters, the batteries are classified into several grades. However, this sorting method only combines the traditional three parameters for sorting, which is not accurate or efficient enough and has certain deviations. It cannot fully guarantee the speed and effectiveness of sorting.

[0004] Therefore, how to achieve a more efficient battery sorting method is an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a method for screening batteries for cascaded utilization based on the consistency of electrochemical parameters, in order to solve the above-mentioned problems.

[0006] The technical solution provided by this invention is as follows:

[0007] In some embodiments, the present invention provides a method for screening batteries for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0008] Obtain the voltage curve, current curve, and temperature curve of each individual cell in the battery module;

[0009] Based on the voltage curve, current curve, and temperature curve of each individual cell, the electrochemical parameters of the individual cells are identified.

[0010] The electrochemical parameters of different individual cells were compared horizontally to screen the individual cells.

[0011] In some embodiments, the present invention provides a method for screening batteries for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0012] The acquisition of the voltage curve, current curve, and temperature curve of each individual cell in the battery module includes:

[0013] Under DST conditions, the voltage, current, and temperature curves of each individual cell in the battery module are collected.

[0014] In some embodiments, the present invention provides a method for screening batteries for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0015] The electrochemical parameter identification of each individual cell based on its voltage, current, and temperature curves includes:

[0016] The voltage, current, and temperature curves of each individual cell are input into the electrochemical model to obtain the electrochemical parameters of the individual cell.

[0017] In some embodiments, the present invention provides a method for screening batteries for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0018] The process of comparing the electrochemical parameters of different individual battery cells and screening the individual battery cells includes:

[0019] The electrochemical parameters of different single-cell batteries were processed to obtain the mean and variance of the same type of electrochemical parameters of different single-cell batteries;

[0020] Based on the mean and variance of the same type of electrochemical parameters of the different individual cells, the electrochemical parameters are classified to classify the individual cells.

[0021] In some embodiments, the present invention provides a method for screening batteries for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0022] The classification of electrochemical parameters based on the mean and variance of the same type of electrochemical parameters in different individual cells, in order to classify the individual cells, includes:

[0023] The electrochemical parameters include highly sensitive electrochemical parameters, moderately sensitive electrochemical parameters, and low-sensitive electrochemical parameters.

[0024] When the highly sensitive electrochemical parameters of the single cell are outside the normal distribution ±1σ, they cannot be distributed in a stepwise manner.

[0025] When the moderately sensitive electrochemical parameters of the single cell are outside the normal distribution ±2σ, they cannot be distributed in a stepwise manner.

[0026] When the low-sensitivity electrochemical parameters of the single cell are outside the normal distribution ±3σ, they cannot be distributed in a stepped manner.

[0027] In some embodiments, the present invention provides a battery screening device for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0028] The acquisition module is used to acquire the voltage curve, current curve, and temperature curve of each individual cell in the battery module;

[0029] The identification module is used to identify the electrochemical parameters of each individual cell based on its voltage curve, current curve, and temperature curve.

[0030] The screening module is used to perform a horizontal comparison of the electrochemical parameters of different individual cells and to screen the individual cells.

[0031] In some embodiments, the present invention provides a battery screening device for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0032] The acquisition module is used for:

[0033] Under DST conditions, the voltage, current, and temperature curves of each individual cell in the battery module are collected.

[0034] In some embodiments, the present invention provides a battery screening device for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0035] The identification module is used for:

[0036] The voltage, current, and temperature curves of each individual cell are input into the electrochemical model to obtain the electrochemical parameters of the individual cell.

[0037] In some embodiments, the present invention provides a battery screening device for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0038] The filtering module is used for:

[0039] The electrochemical parameters of different single-cell batteries were processed to obtain the mean and variance of the same type of electrochemical parameters of different single-cell batteries;

[0040] Based on the mean and variance of the same type of electrochemical parameters of the different individual cells, the electrochemical parameters are classified to classify the individual cells.

[0041] In some embodiments, the present invention provides a battery screening device for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0042] The filtering module is also used for:

[0043] The electrochemical parameters include highly sensitive electrochemical parameters, moderately sensitive electrochemical parameters, and low-sensitive electrochemical parameters.

[0044] When the highly sensitive electrochemical parameters of the single cell are outside the normal distribution ±1σ, they cannot be distributed in a stepwise manner.

[0045] When the moderately sensitive electrochemical parameters of the single cell are outside the normal distribution ±2σ, they cannot be distributed in a stepwise manner.

[0046] When the low-sensitivity electrochemical parameters of the single cell are outside the normal distribution ±3σ, they cannot be distributed in a stepped manner.

[0047] Compared with existing technologies, the battery screening method and apparatus based on the consistency of electrochemical parameters provided by this invention can bring the following beneficial effects:

[0048] This invention utilizes electrochemical parameters as indicators of battery consistency for battery screening, enabling efficient and accurate battery selection. Attached Figure Description

[0049] The preferred embodiments will be described below in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of the screening method and apparatus for cascaded utilization batteries based on the consistency of electrochemical parameters.

[0050] Figure 1 This is a flowchart of an embodiment of a cascaded utilization battery screening method based on the consistency of electrochemical parameters according to the present invention;

[0051] Figure 2 This is a flowchart of another embodiment of the cascade utilization battery screening method based on the consistency of electrochemical parameters of the present invention;

[0052] Figure 3 This is a schematic diagram of the sensitivity electrochemical parameters of the present invention;

[0053] Figure 4 This is a flowchart of an embodiment of a battery screening device for cascaded utilization based on the consistency of electrochemical parameters according to the present invention. Detailed Implementation

[0054] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0055] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0056] In one embodiment, such as Figure 1 As shown, this invention provides a method for screening batteries for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0057] S101 acquires the voltage curve, current curve, and temperature curve of each individual cell in the battery module.

[0058] Specifically, obtain the cell voltage-temperature-current-time curves for each battery under test.

[0059] The current operating conditions used need to cover multiple ratios.

[0060] S102 identifies the electrochemical parameters of each individual cell based on its voltage, current, and temperature curves.

[0061] In this embodiment, after establishing an electrochemical model, various physicochemically significant electrochemical parameters are used to deduce the changes in voltage and temperature over time corresponding to the applied current. Parameter identification is the reverse process: given a real battery's current, voltage, and temperature-time curves, the established electrochemical model is used to obtain the corresponding electrochemical parameters for that battery. This identification process can be achieved using conventional machine learning algorithms or heuristic algorithms.

[0062] S103 performs a horizontal comparison of the electrochemical parameters of different individual cells and screens the individual cells.

[0063] This invention utilizes electrochemical parameters as indicators of battery consistency for battery screening, enabling efficient and accurate battery selection.

[0064] In one embodiment, the present invention provides a method for screening batteries for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0065] The acquisition of the voltage curve, current curve, and temperature curve of each individual cell in the battery module includes:

[0066] Under DST conditions, the voltage, current, and temperature curves of each individual cell in the battery module are collected.

[0067] In one embodiment, the present invention provides a method for screening batteries for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0068] The electrochemical parameter identification of each individual cell based on its voltage, current, and temperature curves includes:

[0069] The voltage, current, and temperature curves of each individual cell are input into the electrochemical model to obtain the electrochemical parameters of the individual cell.

[0070] In one embodiment, the present invention provides a method for screening batteries for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0071] The process of comparing the electrochemical parameters of different individual battery cells and screening the individual battery cells includes:

[0072] The electrochemical parameters of different single-cell batteries were processed to obtain the mean and variance of the same type of electrochemical parameters of different single-cell batteries;

[0073] Based on the mean and variance of the same type of electrochemical parameters of the different individual cells, the electrochemical parameters are classified to classify the individual cells.

[0074] In one embodiment, such as Figure 3 As shown, this invention provides a method for screening batteries for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0075] The classification of electrochemical parameters based on the mean and variance of the same type of electrochemical parameters in different individual cells, in order to classify the individual cells, includes:

[0076] The electrochemical parameters include highly sensitive electrochemical parameters, moderately sensitive electrochemical parameters, and low-sensitive electrochemical parameters.

[0077] When the highly sensitive electrochemical parameters of the single cell are outside the normal distribution ±1σ, they cannot be distributed in a stepwise manner.

[0078] When the moderately sensitive electrochemical parameters of the single cell are outside the normal distribution ±2σ, they cannot be distributed in a stepwise manner.

[0079] When the low-sensitivity electrochemical parameters of the single cell are outside the normal distribution ±3σ, they cannot be distributed in a stepped manner.

[0080] In one embodiment, the present invention provides a method for screening batteries for cascaded utilization based on the consistency of electrochemical parameters, such as... Figure 2 As shown, it includes:

[0081] A method for screening batteries for secondary use based on the consistency of electrochemical parameters is proposed. First, the voltage curves of each individual cell in a module are collected. Then, the electrochemical parameters of each cell are identified. The electrochemical parameters are compared horizontally between cells and then processed in three stages.

[0082] Step S1: Individual Cell Data Acquisition

[0083] Obtain the cell voltage / temperature / current-time profile for each battery under test. The current conditions used need to cover multiple rates; one example is the DST (Digital Current Test) condition.

[0084] Among them, the operating conditions that cover multiple scaling ratios are called DST operating conditions.

[0085] DST (Digital Time Series) test conditions are typically derived by breaking down, tailoring, simplifying, statistically analyzing power distribution, and combining actual test conditions to obtain a set of test conditions that are easy for charge-discharge equipment to simulate. Periodic evaluations using RPT (Real-Time Testing) are required throughout the entire lifespan test. Calendar life testing can usually be conducted using accelerated testing methods. This typically involves storing the battery in a high-temperature environment to accelerate performance degradation and reduce testing time and cost.

[0086] Step S2: Electrochemical parameter identification

[0087] Voltage-temperature-current-time curves for each individual cell. Electrochemical parameters of each cell are identified.

[0088] Specifically, once an electrochemical model is established, it can be deduced from various physicochemically significant electrochemical parameters to obtain the changes in voltage and temperature over time corresponding to the applied current. Parameter identification, on the other hand, is the reverse process. Given a real battery's current, voltage, and temperature-time curves, the established electrochemical model is used to obtain the corresponding electrochemical parameters for that battery. This identification process can be achieved using conventional machine learning algorithms or heuristic algorithms.

[0089] Step S3: Cross-sectional comparison of electrochemical parameters

[0090] The electrochemical parameters of different batteries were subjected to a normal distribution.

[0091] right Figure 3 Electrochemical parameters are classified and processed accordingly. Highly sensitive electrochemical parameters cannot be graded if the cell's value is outside the normal distribution ±1σ. The threshold for medium sensitivity is ±2σ, and the threshold for low sensitivity is ±3σ.

[0092] Specifically, for example, a module has 30 batteries, and each battery can identify 30 electrochemical parameters. Then, each electrochemical parameter is processed using a normal distribution. Specifically, the mean and variance of the same electrochemical parameters from these 30 batteries are calculated.

[0093] In one embodiment, the present invention provides a battery screening device for cascaded utilization based on the consistency of electrochemical parameters, such as... Figure 4 As shown, it includes:

[0094] The acquisition module 101 is used to acquire the voltage curve, current curve and temperature curve of each individual cell in the battery module.

[0095] The identification module 102 is used to identify the electrochemical parameters of each individual cell based on the voltage curve, current curve and temperature curve of each individual cell.

[0096] The screening module 103 is used to perform a horizontal comparison of the electrochemical parameters of different individual cells and to screen the individual cells.

[0097] In one embodiment, the present invention provides a battery screening device for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0098] The acquisition module is used for:

[0099] Under DST conditions, the voltage, current, and temperature curves of each individual cell in the battery module are collected.

[0100] In one embodiment, the present invention provides a battery screening device for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0101] The identification module is used for:

[0102] The voltage, current, and temperature curves of each individual cell are input into the electrochemical model to obtain the electrochemical parameters of the individual cell.

[0103] In one embodiment, the present invention provides a battery screening device for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0104] The filtering module is used for:

[0105] The electrochemical parameters of different single-cell batteries were processed to obtain the mean and variance of the same type of electrochemical parameters of different single-cell batteries;

[0106] Based on the mean and variance of the same type of electrochemical parameters of the different individual cells, the electrochemical parameters are classified to classify the individual cells.

[0107] In one embodiment, the present invention provides a battery screening device for cascaded utilization based on the consistency of electrochemical parameters, comprising:

[0108] The filtering module is also used for:

[0109] The electrochemical parameters include highly sensitive electrochemical parameters, moderately sensitive electrochemical parameters, and low-sensitive electrochemical parameters.

[0110] When the highly sensitive electrochemical parameters of the single cell are outside the normal distribution ±1σ, they cannot be distributed in a stepwise manner.

[0111] When the moderately sensitive electrochemical parameters of the single cell are outside the normal distribution ±2σ, they cannot be distributed in a stepwise manner.

[0112] When the low-sensitivity electrochemical parameters of the single cell are outside the normal distribution ±3σ, they cannot be distributed in a stepped manner.

[0113] This invention utilizes electrochemical parameters as indicators of battery consistency for battery screening, enabling efficient and accurate battery selection.

[0114] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for screening a battery for stepwise utilization based on consistency of electrochemical parameters, characterized by, The method comprises the following steps: obtaining the voltage curve, current curve and temperature curve of each single battery in the battery module; based on the voltage curve, current curve and temperature curve of each single battery, the electrochemical parameters of the single battery are identified; the electrochemical parameters of different single batteries are compared horizontally, and the single batteries are screened; wherein, based on the voltage curve, current curve and temperature curve of each single battery, the electrochemical parameters of the single battery are identified, which comprises: inputting the voltage curve, current curve and temperature curve of each single battery into the electrochemical model to obtain the electrochemical parameters of the single battery; the electrochemical parameters of different single batteries are compared horizontally, and the single batteries are screened, which comprises: the electrochemical parameters of different single batteries are processed by normal distribution to obtain the mean and variance of the same type of electrochemical parameters of different single batteries; based on the mean and variance of the same type of electrochemical parameters of different single batteries, the electrochemical parameters are classified to classify the single batteries; the electrochemical parameters of different single batteries are compared horizontally, and the single batteries are screened, which comprises: the electrochemical parameters include high sensitivity electrochemical parameters, medium sensitivity electrochemical parameters and low sensitivity electrochemical parameters; when the high sensitivity electrochemical parameters of the single battery are outside the normal distribution ± 1σ, they cannot be distributed in stages; when the medium sensitivity electrochemical parameters of the single battery are outside the normal distribution ± 2σ, they cannot be distributed in stages; when the low sensitivity electrochemical parameters of the single battery are outside the normal distribution ± 3σ, they cannot be distributed in stages.

2. The screening method of claim 1, wherein the screening method is based on consistency of electrochemical parameters. the method comprises the following steps: under the DST working condition, the voltage curve, current curve and temperature curve of each single battery in the battery module are collected.

3. A screening device for step-up utilization batteries based on consistency of electrochemical parameters, characterized in that it comprises: The method comprises the following steps: an acquisition module is configured to obtain the voltage curve, current curve and temperature curve of each single battery in the battery module; an identification module is configured to identify the electrochemical parameters of the single battery based on the voltage curve, current curve and temperature curve of each single battery; a screening module is configured to compare the electrochemical parameters of different single batteries horizontally and screen the single batteries; wherein, the identification module is configured to input the voltage curve, current curve and temperature curve of each single battery into the electrochemical model to obtain the electrochemical parameters of the single battery; the screening module is configured to: process the electrochemical parameters of different single batteries by normal distribution to obtain the mean and variance of the same type of electrochemical parameters of different single batteries; based on the mean and variance of the same type of electrochemical parameters of different single batteries, the electrochemical parameters are classified to classify the single batteries; the screening module is further configured to: the electrochemical parameters include high sensitivity electrochemical parameters, medium sensitivity electrochemical parameters and low sensitivity electrochemical parameters; The monomer battery cannot be distributed in series when the high-sensitivity electrochemical parameter of the monomer battery is outside the normal distribution ± 1σ; The monomer battery cannot be distributed in series when the medium-sensitivity electrochemical parameter of the monomer battery is outside the normal distribution ± 2σ; The monomer battery cannot be distributed in series when the low-sensitivity electrochemical parameter of the monomer battery is outside the normal distribution ± 3σ.

4. The screening device for step-up use batteries based on consistency of electrochemical parameters according to claim 3, characterized in that, The acquisition module is used to: Under the DST working condition, the voltage curve, the current curve and the temperature curve of each monomer battery in the battery module are collected.

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