CN-119689291-B - Battery cell performance parameter prediction method and device and electronic equipment

CN119689291BCN 119689291 BCN119689291 BCN 119689291BCN-119689291-B

Abstract

The invention discloses a method and a device for predicting battery cell performance parameters and electronic equipment. The method comprises the steps of obtaining target slurry, determining test data corresponding to the target slurry under test parameters, inputting the impedance test data into an equivalent circuit model to be fitted, obtaining a plurality of circuit parameter values, constructing the equivalent circuit model according to the target type of the battery core, and predicting performance parameters of the battery core manufactured by using the target slurry under the test parameters according to the plurality of circuit parameter values. The invention solves the technical problem that in the related technology, the performance parameters related to the battery cells are difficult to be determined conveniently according to the slurry.

Inventors

HE YAN
CHEN YIHONG
ZHANG YA
JIANG TAIZHI

Assignees

上海轩邑新能源发展有限公司

Dates

Publication Date: 20260512
Application Date: 20241213

Claims (9)

1. The battery cell performance parameter prediction method is characterized by comprising the following steps of: Obtaining target slurry, wherein the target slurry is used for constructing a target type cell; determining corresponding test data of the target slurry under test parameters, wherein the test data comprise impedance test data; Inputting the impedance test data into an equivalent circuit model for fitting to obtain a plurality of circuit parameter values, wherein the equivalent circuit model is built according to a battery core of the target type, the equivalent circuit model comprises four sub-circuits, a first sub-circuit comprises a charge moving resistor, a second sub-circuit is formed by connecting a solution resistor with a first constant phase element in parallel, a third sub-circuit is formed by connecting an active substance resistor with a second constant phase element in parallel, a fourth sub-circuit is formed by connecting an electric double layer resistor capacitor with a third constant phase element in parallel, the first constant phase element is a constant phase element representing the interface characteristic between a binder and a solvent, the second constant phase element is a constant phase element representing the interface characteristic between the binder and the active substance material, the third constant phase element is a constant phase element representing the interface characteristic between a conductive agent and the active substance material, the electric double layer resistor is formed by connecting an electric double layer resistor with the electric double layer capacitor in series, and the four sub-circuits are sequentially connected in series; Predicting performance parameters of the battery cell manufactured by using the target slurry under the test parameters according to the circuit parameter values; The method comprises the steps of predicting performance parameters of a battery core manufactured by using target slurry under test parameters according to a plurality of circuit parameter values, wherein the target slurry comprises electrode materials, conductive agents and solvents, the electrode materials comprise active substances, the circuit parameter values comprise fitting charge moving resistance values, fitting solution resistance values, fitting active substance resistance values, fitting double-layer resistance values and fitting constant-phase element values, determining charge transfer efficiency performance of the solvents and the electrode materials according to the fitting charge moving resistance values, determining conducting path impedance formed by the adhesive and the conductive substances according to the fitting solution resistance values, determining active substance impedance of the active substances in the electrode materials according to the fitting active substance resistance values, determining charge transmission performance between the conductive agents and the active substances according to the fitting double-layer resistance values, determining dispersion performance of components in the target slurry according to the fitting constant-phase element values, and predicting the performance of the battery core under test parameters according to the charge transfer efficiency performance of the conductive path impedance, the active substance impedance and the dispersion performance of the conductive substances.
2. The method of claim 1, wherein predicting the performance parameters of the cell made using the target paste at the test parameters based on the charge transfer efficiency performance, the conductive path impedance, the active material impedance, the charge transfer performance and the dispersion performance comprises: in the case where the electrode material further includes a binder, the fitted constant phase element values include a first constant phase element value, a second constant phase element value, and a third constant phase element value, determining a first sub-contact property between the binder and the solvent according to the first constant phase element value; determining a second subcontact of said binder with said active material based on said second constant phase element value; Determining a third sub-contact property between the conductive agent and the active material according to the third constant phase element value; Determining a contact property corresponding to the electrode material according to the first sub-contact property, the second sub-contact property and the third sub-contact property; and predicting performance parameters of a battery cell manufactured by using the target slurry under the test parameters according to the charge transfer efficiency performance, the conductive path impedance, the active material impedance, the charge transfer performance, the dispersion performance and the contact performance.
3. The method of claim 1, wherein the determining test data corresponding to the target slurry under test parameters comprises: Transferring the target slurry to a preset test fixture, wherein the preset test fixture comprises a target test tube, a first conductive electrode and a second conductive electrode, the first conductive electrode is positioned on a first side surface of the target test tube, and the second conductive electrode is positioned on a second side surface of the target test tube; And starting the preset test tool under the test parameters to obtain the test data.
4. The method of claim 1, wherein the second sub-circuit corresponds to an ac test current having a frequency greater than the frequency of the ac test current corresponding to the third sub-circuit, and wherein the third sub-circuit corresponds to an ac test current having a frequency greater than the frequency of the ac test current corresponding to the fourth sub-circuit.
5. The method of claim 1, wherein predicting the performance parameter of the cell fabricated using the target paste at the test parameter based on the plurality of circuit parameter values further comprises: Determining a composition parameter of the target slurry if the performance parameter is less than a predetermined threshold; And adjusting the composition parameters to obtain updated slurry so as to determine the corresponding performance parameters of the updated slurry.
6. The method of any one of claims 1 to 5, wherein before inputting the impedance test data to an equivalent circuit model for fitting, further comprising: Obtaining sample slurry and a sample battery constructed by the sample slurry, wherein the sample battery is a battery of the target type; determining a sample performance parameter of the sample cell; Determining a prior control relationship of the constituent components of the sample slurry to the sample performance parameters; And constructing the equivalent circuit model according to the comparison relation.
7. A cell performance parameter prediction apparatus, comprising: The device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring target slurry, and the target slurry is used for constructing a target type cell; The determining module is used for determining test data corresponding to the target slurry under test parameters, wherein the test data comprise impedance test data; The fitting module is used for inputting the impedance test data into an equivalent circuit model to be fitted to obtain a plurality of circuit parameter values, wherein the equivalent circuit model is built according to a battery core of the target type, the equivalent circuit model comprises four sub-circuits, a first sub-circuit comprises a charge moving resistor, a second sub-circuit is formed by connecting a solution resistor with a first constant-phase element in parallel, a third sub-circuit is formed by connecting an active substance resistor with a second constant-phase element in parallel, a fourth sub-circuit is formed by connecting an electric double layer resistor capacitor with a third constant-phase element in parallel, the first constant-phase element is a constant-phase element representing the interface characteristic between a binder and a solvent, the second constant-phase element is a constant-phase element representing the interface characteristic between the binder and the active substance material, the third constant-phase element is a constant-phase element representing the interface characteristic between a conductive agent and the active substance material, the electric double layer resistor capacitor is formed by connecting an electric double layer resistor and an electric double layer capacitor in series, and the four sub-circuits are sequentially connected in series; The prediction module is used for predicting the performance parameters of the battery cell manufactured by using the target slurry under the test parameters according to the circuit parameter values; The prediction module is used for determining charge transfer efficiency performance of the solvent and the electrode material according to the fitted charge movement resistance value under the condition that the target slurry comprises an electrode material, a conductive agent and a solvent, wherein the electrode material comprises an active substance, the circuit parameter values comprise a fitted charge movement resistance value, a fitted solution resistance value, a fitted active substance resistance value, a fitted double electric layer resistance value and a fitted constant phase element value, determining conductive path impedance formed by the binder and the conductive substance according to the fitted solution resistance value, determining active substance impedance of the active substance in the electrode material according to the fitted active substance resistance value, determining charge transfer performance between the conductive agent and the active substance according to the fitted double electric layer resistance value, determining dispersion performance of each component in the target slurry according to the fitted constant phase element value, and predicting performance parameters of a battery core manufactured by using the target slurry under the test parameters according to the charge transfer efficiency performance, wherein the conductive path impedance, the active substance impedance and the dispersion performance are determined according to the fitted constant phase element resistance.
8. An electronic device, comprising: A processor; a memory for storing the processor-executable instructions; Wherein the processor is configured to execute the instructions to implement the cell performance parameter prediction method of any one of claims 1 to 6.
9. A computer readable storage medium, characterized in that instructions in the computer readable storage medium, when executed by a processor of an electronic device, enable the electronic device to perform the cell performance parameter prediction method of any one of claims 1 to 6.

Description

Battery cell performance parameter prediction method and device and electronic equipment Technical Field The invention relates to the field of batteries, in particular to a method and a device for predicting performance parameters of a battery cell and electronic equipment. Background The lithium ion battery consists of a positive electrode, a negative electrode and electrolyte, and the conductivity of the electrode slurry is an important electrode performance evaluation index. Conductivity refers to the ability of an object to conduct current, and the conductivity of the materials of each part in a battery is directly related to the capacity of the battery and the magnitude of the rate capability. The conductivity of the electrode slurry is generally evaluated by adopting a conductivity measuring method of the slurry, and at present, for the conductivity test of the conductive slurry of a battery material, chinese patent publication No. CN108303592A discloses a conductivity testing method of a lithium ion battery pole piece dressing layer, chinese patent publication No. CN108226641A discloses a conductivity testing method of a lithium ion battery cathode material, however, the internal components of the conductive slurry of the lithium ion battery electrode are complex, the traditional method cannot quickly acquire internal conductive network data, so that the composition of the conductive network in the slurry cannot be judged, and the screening work of the type, the content and the content of a main material of the conductive agent cannot be further carried out, so that the screening work of the electrode slurry formula is complicated and has low efficiency, and the technical problem that the performance parameters related to a battery core are difficult to conveniently determine according to the slurry exists. In view of the above problems, no effective solution has been proposed at present. Disclosure of Invention The embodiment of the invention provides a method and a device for predicting performance parameters of a battery cell and electronic equipment, which at least solve the technical problem that in the related art, the performance parameters related to the battery cell are difficult to determine conveniently according to slurry. According to one aspect of the embodiment of the invention, a method for predicting performance parameters of a battery cell is provided, which comprises the steps of obtaining target slurry, determining test data corresponding to the target slurry under test parameters, wherein the test data comprise impedance test data, inputting the impedance test data into an equivalent circuit model for fitting to obtain a plurality of circuit parameter values, the equivalent circuit model is constructed according to the target type of battery cell, the equivalent circuit model comprises four sub-circuits, a first sub-circuit comprises a charge moving resistor, a second sub-circuit is formed by connecting a solution resistor with a first constant phase element in parallel, a third sub-circuit is formed by connecting an active material resistor with a second constant phase element in parallel, a fourth sub-circuit is formed by connecting an electric double layer resistor capacitor with a third constant phase element in parallel, the first constant phase element is a constant phase element representing interface characteristics between a binder and a solvent, the second constant phase element is a constant phase element representing interface characteristics between the binder and the active material, the third constant phase element is a constant phase element representing interface characteristics between the binder and the active material, the electric double layer capacitor is formed by connecting the electric double layer capacitor with the active material in series, and the series resistance parameter values are sequentially predicted according to the target performance parameters. The method comprises the steps of predicting performance parameters of a cell manufactured by using the target slurry according to the test parameters, wherein the target slurry comprises electrode materials, conductive agents and solvents, the electrode materials comprise active substances, the circuit parameter values comprise fitting charge moving resistance values, fitting solution resistance values, fitting active substance resistance values, fitting double-layer resistance values, determining charge transfer efficiency performance of the solvents and the electrode materials according to fitting charge moving resistance values under the condition of fitting constant-phase element values, determining conductive path impedance formed by the adhesive and the conductive substances according to the fitting solution resistance values, determining active substance impedance of the active substances in the electrode materials according to the fitting active substance resistance values, determining charg