Battery corrosion detection method and device, vehicle and computer program product

Abstract

The invention provides a battery corrosion detection method and device, a vehicle and a computer program product. The method comprises the following steps: acquiring an initial shell pressure and a charge mass transfer impedance parameter of a battery; determining a detection threshold according to the initial shell pressure and the charge mass transfer impedance parameter; according to the method, the batteries with relatively high corrosion risk are accurately identified and eliminated according to the detection threshold value, meanwhile, the batteries in a false low shell pressure state are prevented from being eliminated in production, the battery pack is prevented from being corroded, and the cost is saved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a battery corrosion detection method and device, a vehicle and a computer program product. Background Art

[0002] At present, the judgment of corrosion batteries is based on simple shell voltage measurement, and the empirical shell voltage threshold is used as the judgment standard. However, it is impossible to establish a strong correlation with the risk of aluminum shell corrosion judged by the shell voltage, which has certain defects. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, an object of the present invention is to propose a battery corrosion detection method, which accurately identifies and eliminates batteries with higher corrosion risks based on the size of a detection threshold, while avoiding batteries in a "false low shell pressure" state from being eliminated during production, preventing battery pack corrosion and saving costs.

[0005] To this end, a second object of the present invention is to provide a battery corrosion detection device.

[0006] To this end, a third object of the present invention is to provide a vehicle.

[0007] To this end, a fourth object of the present invention is to provide a computer-readable storage medium.

[0008] To this end, a fifth object of the present invention is to provide a computer program product.

[0009] In order to achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a battery corrosion detection method, which includes: obtaining the initial shell pressure and charge mass transfer impedance parameters of the battery; determining a detection threshold based on the initial shell pressure and the charge mass transfer impedance parameters; and determining the corrosion risk of the battery based on the detection threshold.

[0010] According to the corrosion detection method of the battery in the embodiment of the present invention, on the basis of obtaining the initial shell pressure of the battery, the conduction mode of the battery is deeply detected based on the impedance detection technology, and the charge mass transfer impedance parameters of the battery are determined. The detection threshold that the negative electrode can pass through the shell is determined according to the initial shell pressure and the charge mass transfer impedance parameters, so as to accurately identify and eliminate batteries with higher corrosion risks according to the size of the detection threshold, and at the same time avoid batteries in a "false low shell pressure" state from being eliminated during production, prevent battery pack corrosion, and save costs.

[0011] In some embodiments, obtaining the charge mass transfer impedance parameter of the battery includes: obtaining an impedance spectrum of the battery; determining an equivalent circuit diagram based on the impedance spectrum; and determining the charge mass transfer impedance parameter based on the equivalent circuit diagram.

[0012] In some embodiments, determining the charge mass transfer impedance parameter according to the equivalent circuit diagram includes: acquiring characteristic parameters in the equivalent circuit diagram; determining the impedance parameter of the battery according to the characteristic parameters; and determining the impedance parameter as the charge mass transfer impedance parameter.

[0013] In some embodiments, when determining the impedance parameter of the battery according to the characteristic parameter, the characteristic parameter is substituted into the following formula:

[0014]

[0015] Wherein, Z is the modulus value of the impedance parameter, ω is the frequency, C is the capacitance value, R is the impedance parameter, Z′ is the real part of the impedance parameter, Z" is the imaginary part of the impedance parameter, and φ is the angle between the imaginary part Z" of the impedance parameter and the modulus Z of the impedance parameter.

[0016] In some embodiments, when determining the detection threshold according to the initial shell pressure and the charge mass transfer impedance parameter, the initial shell pressure and the charge mass transfer impedance parameter are substituted into the following formula: including:

[0017] I=U 负壳 / R ct

[0018] Wherein, I is the detection threshold, and U 负壳 is the initial shell pressure, the R ct is the charge mass transfer impedance parameter.

[0019] In some embodiments, the corrosion risk of the battery is determined according to the detection threshold, including: the detection threshold is less than or equal to a preset detection threshold, determining that the battery is a first corrosion risk battery; the detection threshold is greater than the preset detection threshold, determining that the battery is a second corrosion risk battery, and the corrosion risk of the second corrosion risk battery is greater than the corrosion risk of the first corrosion risk battery.

[0020] In some embodiments, the method further includes: when determining that the battery is a first corrosion risk battery, retaining the first corrosion risk battery; and when determining that the battery is a second corrosion risk battery, removing the second corrosion risk battery.

[0021] In some embodiments, after determining the corrosion risk of the battery according to the detection threshold, it also includes: repairing the battery and performing a preset number of constant current charge and discharge cycles to determine a coulombic efficiency change graph and a repaired shell pressure; and verifying the corrosion risk of the battery according to the coulombic efficiency change graph, the repaired shell pressure and the initial shell pressure.

[0022] In some embodiments, before obtaining the charge mass transfer impedance parameter of the battery, the method further includes: performing constant current charging on the battery to a preset state of charge.

[0023] In order to achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention proposes a battery corrosion detection device, which includes: an acquisition module, used to obtain the initial shell pressure and charge mass transfer impedance parameters of the battery; a first determination module, used to determine a detection threshold based on the initial shell pressure and the charge mass transfer impedance parameters; a second determination module, used to determine the corrosion risk of the battery based on the detection threshold.

[0024] According to the corrosion detection device of the battery in the embodiment of the present invention, on the basis of obtaining the initial shell pressure of the battery, the conduction mode of the battery is deeply detected based on the impedance detection technology, and the charge mass transfer impedance parameters of the battery are determined. The detection threshold that the negative electrode can pass through the shell is determined according to the initial shell pressure and the charge mass transfer impedance parameters, so as to accurately identify and eliminate batteries with higher corrosion risks according to the size of the detection threshold, and at the same time avoid batteries in a "false low shell pressure" state from being eliminated during production, prevent battery pack corrosion, and save costs.

[0025] In order to achieve the above-mentioned object, an embodiment of a third aspect of the present invention provides a vehicle, wherein the vehicle comprises the battery corrosion detection device described in the above-mentioned embodiment.

[0026] According to the vehicle of the embodiment of the present invention, on the basis of obtaining the initial shell pressure of the battery, the conduction mode of the battery is deeply detected based on the impedance detection technology, and the charge mass transfer impedance parameters of the battery are determined. The detection threshold that the negative electrode can pass through the shell is determined according to the initial shell pressure and the charge mass transfer impedance parameters, so as to accurately identify and eliminate batteries with higher corrosion risks according to the size of the detection threshold, and at the same time avoid batteries in a "false low shell pressure" state from being eliminated during production, prevent battery pack corrosion, and save costs.

[0027] In order to achieve the above-mentioned purpose, an embodiment of the fourth aspect of the present invention proposes a computer-readable storage medium, on which a battery corrosion detection program is stored. When the battery corrosion detection program is executed by a processor, the battery corrosion detection method described in the above-mentioned embodiment is implemented.

[0028] In order to achieve the above-mentioned purpose, an embodiment of the fifth aspect of the present invention proposes a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the battery corrosion detection method described in the above-mentioned embodiment.

[0029] According to the computer program product of the embodiment of the present invention, on the basis of obtaining the initial shell pressure of the battery, the conduction mode of the battery is deeply detected based on the impedance detection technology, and the charge mass transfer impedance parameters of the battery are determined. The detection threshold that the negative electrode can pass through the shell is determined according to the initial shell pressure and the charge mass transfer impedance parameters, so as to accurately identify and eliminate batteries with higher corrosion risks according to the size of the detection threshold, and at the same time avoid batteries in a "false low shell pressure" state from being eliminated during production, prevent battery pack corrosion, and save costs.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0032] Figure 1 is a flow chart of a battery corrosion detection method according to an embodiment of the present invention;

[0033] Figure 2 is an impedance spectrum diagram according to an embodiment of the present invention;

[0034] Figure 3 is an equivalent circuit diagram according to an embodiment of the present invention;

[0035] Figure 4 is an equivalent circuit diagram according to another embodiment of the present invention;

[0036] Figure 5 is a flow chart of a battery corrosion detection method according to an embodiment of the present invention;

[0037] Figure 6 is a flow chart of a battery corrosion detection method according to an embodiment of the present invention;

[0038] Figure 7 is a structural block diagram of a battery corrosion detection device according to an embodiment of the present invention;

[0039] Figure 8 is a structural block diagram of a vehicle according to an embodiment of the present invention;

[0040] Description of the drawings: Battery corrosion detection device 2;

[0041] Acquisition module 21; first determination module 22; second determination module 23;

[0042] Vehicle 3. DETAILED DESCRIPTION

[0043] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0044] Poor shell pressure is one of the problems caused by the production of lithium-ion batteries. Although the aluminum shell used in batteries has advantages over steel shells, such as light weight, good elongation, corrosion resistance, and strong thermal conductivity, the risk of aluminum shells reacting with lithium ions to form lithium-aluminum alloys is fatal. Therefore, when there is serious conduction between the negative electrode and the shell, it is more likely to cause a primary battery reaction with the aluminum shell and the negative electrode as the main body, so that lithium is embedded in the aluminum shell to form a lithium-aluminum alloy, thereby corroding the aluminum shell and causing serious safety problems. However, simply judging the risk of aluminum shell corrosion by shell voltage cannot establish a strong correlation, for example, batteries in a "false low shell pressure" state can be repaired.

[0045] In order to solve the problem of repairing low-shell voltage batteries, a method for detecting aluminum shell corrosion of lithium-ion batteries is currently disclosed. The method includes the following steps: obtaining a voltage screening range for screening candidate batteries and obtaining a voltage boundary value for battery aluminum shell corrosion; performing constant current discharge on the lithium-ion batteries after capacity division to a preset state of charge, and then screening candidate batteries according to the voltage boundary value; placing the candidate batteries aside for a period of time, and then measuring the voltage difference between the positive electrode and the shell and the voltage difference between the negative electrode and the shell of the candidate batteries, and then screening out batteries with aluminum shell corrosion by comparing the measured voltage difference with the voltage boundary value. However, this technology has the following defects: (1) The voltage screening range has limitations in both theoretical and practical experience selection; (2) The detection means are complicated and time-consuming; (3) The actual effect of detecting aluminum shell corrosion is unknown.

[0046] Alternatively, a method for preventing electrochemical corrosion of a lithium-ion power battery is disclosed, the detection method comprising: detecting the shell voltage of the lithium-ion power battery and fitting it; comparing the fitting result with a preset shell voltage threshold to determine whether there is an abnormality in the change of the shell voltage; calculating the voltage change rate of the lithium-ion power battery to identify the possible electrochemical corrosion risk, and then calculating the voltage difference between the negative electrode and the shell of the lithium-ion power battery to obtain different corrosion risk areas. However, this technology has the following defects: (1) It is necessary to establish a database to obtain an empirical fitting curve, which is costly; (2) There are limitations in judging the corrosion risk by the voltage difference between the negative electrode and the shell.

[0047] Or a method for detecting the stability of a lithium-ion battery shell is disclosed, the detection method comprising: intercepting a portion of the battery shell as a test electrode and immersing it in an electrolyte; detecting the impedance on the test electrode in real time to obtain a first AC impedance change curve of the test electrode; applying a detection voltage that changes at a preset speed uniformly on the test electrode to obtain a self-potential change curve of the test electrode; detecting the impedance on the test electrode in real time again to obtain a second AC impedance change curve of the test electrode; matching and comparing the first AC impedance change curve and the second AC impedance change curve to determine the stability of the battery shell in the electrolyte. However, this technology has the following defects: (1) It is impossible to judge the corrosion risk of batteries with poor shell pressure due to the conduction between the negative electrode and the shell; (2) It requires a three-electrode system test, which has a high detection cost and is not suitable for engineering applications.

[0048] The present invention is applicable to all types of lithium-ion batteries. The following is an example of a lithium iron phosphate aluminum shell square battery with a nominal capacity of 25Ah.

[0049] Combine the following Figure 1-Figure 6 A battery corrosion detection method according to an embodiment of the present invention is described.

[0050] like Figure 1 As shown, the battery corrosion detection method according to the embodiment of the present invention at least includes step S1 and step S2.

[0051] Step S1, obtaining the initial shell pressure and charge mass transfer impedance parameters of the battery.

[0052] Among them, the initial shell pressure is the voltage value between the positive and negative electrodes of the battery, which is also the potential of the battery shell; the charge mass transfer impedance parameter is the difficulty of the charge passing through the negative electrode to the electrolyte. The charge mass transfer impedance parameter obtained by impedance detection technology is universal and stable, and can standardize the information of batteries, especially batteries with poor shell pressure.

[0053] In the embodiment, based on the impedance detection technology, the conduction mode of the battery is deeply detected, the lithium deposition situation inside the battery is identified, and the initial shell pressure of the battery is obtained, for example, recorded as U 负壳 and the charge mass transfer impedance parameter, for example, denoted as R ct Under normal circumstances, the battery shell should not be in direct contact with the electrodes inside the battery. Therefore, by measuring the potential value of the battery shell, it is possible to determine whether there is electrode leakage or other faults inside the battery, as well as the potential changes of the battery. At the same time, in the electrochemical reaction, the ions in the electrolyte solution will migrate under the action of the electric field and participate in the electrochemical reaction. The charge transfer impedance parameter R ct It describes the difficulty of electrolyte ions migrating into the electrolyte. Charge transfer impedance parameter R ctThe smaller it is, the easier it is for ions to migrate, the faster the electrochemical reaction rate is, and the battery is more susceptible to corrosion.

[0054] Step S2, determining a detection threshold according to the initial shell pressure and the charge mass transfer impedance parameter.

[0055] In the embodiment, the initial shell pressure U is obtained. 负壳 and charge mass transfer impedance parameter R ct Finally, the above parameters are substituted into the preset formula to calculate the detection threshold that the negative electrode can pass through the shell, such as the current threshold. The determined detection threshold can accurately and efficiently identify the battery in the "false low shell pressure" state. It can be understood that different types of batteries have different corresponding detection thresholds.

[0056] Step S3, determining the corrosion risk of the battery according to the detection threshold.

[0057] In an embodiment, after determining the detection threshold, the size relationship between the detection threshold and the preset detection threshold is judged, so as to divide the corrosion risk degree of the battery into high corrosion risk and low corrosion risk, identify and remove batteries with high corrosion risk, prevent battery pack corrosion, and avoid batteries in a "false low shell pressure" state from being removed during production, thereby saving costs.

[0058] According to the corrosion detection method of the battery in the embodiment of the present invention, on the basis of obtaining the initial shell pressure of the battery, the conduction mode of the battery is deeply detected based on the impedance detection technology, and the charge mass transfer impedance parameters of the battery are determined. The detection threshold that the negative electrode can pass through the shell is determined according to the initial shell pressure and the charge mass transfer impedance parameters, so as to accurately identify and eliminate batteries with higher corrosion risks according to the size of the detection threshold, and at the same time avoid batteries in a "false low shell pressure" state from being eliminated during production, prevent battery pack corrosion, and save costs.

[0059] In some embodiments, before obtaining the charge mass transfer impedance parameter of the battery, the method further includes: performing constant current charging on the battery to a preset state of charge.

[0060] In an embodiment, in order to increase the accuracy of detection, different batteries of the same type are charged to a fully charged state under standard operating conditions. For example, three batteries with poor shell pressure and one normal battery are used, such as the initial shell pressure of battery 1# is 0.884V, the initial shell pressure of battery 2# is 0.643V, the initial shell pressure of battery 3# is 0.648V, and the initial shell pressure of battery 4# is 2.411V. The above batteries are charged to a fully charged state at a constant current of 3.8V with a cut-off voltage of 0.33C.

[0061] In some embodiments, obtaining the charge mass transfer impedance parameter of the battery includes: obtaining an impedance spectrum of the battery; determining an equivalent circuit diagram according to the impedance spectrum; and determining the charge mass transfer impedance parameter according to the equivalent circuit diagram.

[0062] In the embodiment, an electrochemical impedance tester is used, the test clamp is connected to the negative electrode and both sides of the shell of the battery, and the voltage is set at 2mV and the frequency range is 0.1 to 100000 Hz in the voltage perturbation mode. Figure 2 As shown in the figure, the negative electrode to shell impedance spectra of three batteries with poor shell pressure, namely 1#, 2#, and 3# batteries, are obtained. According to the negative electrode to shell impedance spectra, Zview is used to fit the equivalent circuit, as shown in Figure 3 The equivalent circuit diagram is shown in Figure 2. Similarly, Figure 4 As shown, the equivalent circuit diagram of a normal battery, i.e., battery #4, is obtained.

[0063] According to the characteristics of the results of equivalent circuit fitting, it can be roughly divided into three categories, namely, a double-capacitor circuit dominated by two interface capacitances without Warburg diffusion, a circuit dominated by Warburg diffusion, and a single-capacitor circuit in which a single interface capacitance and Warburg diffusion influence each other. The charge and mass transfer impedance parameters are determined based on the above equivalent circuit diagrams.

[0064] In some embodiments, determining the charge mass transfer impedance parameter according to the equivalent circuit diagram includes: obtaining characteristic parameters in the equivalent circuit diagram; determining the impedance parameter of the battery according to the characteristic parameters; and determining the impedance parameter as the charge mass transfer impedance parameter.

[0065] In the embodiment, after determining the equivalent circuit diagram, characteristic parameters are obtained from the equivalent circuit diagram, including: the modulus Z of the impedance parameter, the real part Z′ of the impedance parameter, the imaginary part Z″ of the impedance parameter, the angle φ between the imaginary part Z″ of the impedance parameter and the modulus Z of the impedance parameter, the frequency ω, and the capacitance value C, so as to determine the impedance parameter R of the battery according to the above parameters, and determine the impedance parameter R as the charge mass transfer impedance parameter R ct , that is, R ct =R, and the specific impedance value of the negative electrode to the shell is obtained.

[0066] Figure 4 The equivalent circuit diagram in is a single capacitor circuit. Figure 4 The first interface capacitance that appears is determined as the impedance parameter and is related to Figure 3 The 3# battery shown belongs to the same conduction mechanism, which means that the 3# battery is a repairable battery with poor shell pressure, a "false low shell pressure" battery, and has a low corrosion risk.

[0067] In some embodiments, when determining the impedance parameter of the battery according to the characteristic parameter, the characteristic parameter is substituted into the following formula:

[0068]

[0069] Where Z is the modulus of the impedance parameter, ω is the frequency, C is the capacitance value, R is the impedance parameter, Z′ is the real part of the impedance parameter, Z" is the imaginary part of the impedance parameter, and φ is the angle between the imaginary part Z" of the impedance parameter and the modulus Z of the impedance parameter.

[0070] In some embodiments, when determining the detection threshold according to the initial shell pressure and the charge mass transfer impedance parameter, the initial shell pressure and the charge mass transfer impedance parameter are substituted into the following formula: including:

[0071] I=U 负壳 / R ct

[0072] Among them, I is the detection threshold, U 负壳 is the initial shell pressure, R ct is the charge mass transfer impedance parameter.

[0073] In some embodiments, the corrosion risk of a battery is determined based on a detection threshold, including: when the detection threshold is less than or equal to a preset detection threshold, the battery is determined to be a first corrosion risk battery; when the detection threshold is greater than the preset detection threshold, the battery is determined to be a second corrosion risk battery, and the corrosion risk of the second corrosion risk battery is greater than the corrosion risk of the first corrosion risk battery.

[0074] In the embodiment, after determining the detection threshold of the battery, the size relationship between the detection threshold and the preset detection threshold is determined. For example, the preset detection threshold is 0.02A, the detection threshold of battery 1# is 0.03536A, the detection threshold of battery 2# is ∞, and the detection threshold of battery 3# is 0.002172A. Battery 3# is considered to be a first corrosion risk battery, that is, the corrosion risk of battery 3# is low, and the battery is retained; battery 1# and battery 2# are second corrosion risk batteries, that is, the corrosion risks of batteries 1# and 2# are high, and the above-mentioned second corrosion risk batteries are eliminated.

[0075] In some embodiments, after determining the corrosion risk of the battery according to the detection threshold, it also includes: repairing the battery and performing a preset number of constant current charge and discharge cycles to determine the coulomb efficiency change graph and the repair shell pressure; verifying the corrosion risk of the battery according to the coulomb efficiency change graph, the repair shell pressure and the initial shell pressure.

[0076] In an embodiment, Figure 5 As shown, the batteries with poor shell pressure of 1#, 2#, and 3# were repaired, and the shell pressures after repair were 2.277V, 1.438V, and 2.158V, respectively. They were charged and discharged at a constant current of 0.5C for 100 cycles, and the coulomb efficiency change graph was obtained. According to the coulomb efficiency change graph, it can be determined that the coulomb efficiency of batteries 1# and 2# is unstable and has large fluctuations.

[0077] As shown in Table 1 and Figure 5As shown, the repaired shell pressure after the cycle is measured, and the repaired shell pressures of 1#, 2#, and 3# batteries are 0.771V, 1.053V, and 2.031V, respectively. Since the difference between the repaired shell pressures of 1# and 2# batteries and their initial shell pressures is small, that is, the shell pressures of 1# and 2# batteries are basically unchanged after repair, and the cycle decay rate is fast, it is believed that 1# and 2# batteries are "true low shell pressure" batteries, and the risk of corrosion of the aluminum shells of 1# and 2# batteries is relatively large; the difference between the repaired shell pressure and the initial shell pressure of 3# battery is large, that is, after repair, 3# battery can recover and maintain above 2V, and the decay rate is slow, it is believed that 3# battery is a "false low shell pressure" battery, and the risk of corrosion of the aluminum shell of 3# battery is relatively small.

[0078] Table 1

[0079]

[0080] Reference below Figure 6 The corrosion detection method of a battery according to an embodiment of the present invention is described by way of example.

[0081] like Figure 6 As shown, the battery corrosion detection method according to the embodiment of the present invention at least includes steps S11 to S21.

[0082] Step S11, charging the battery with a constant current to a preset state of charge.

[0083] Step S12, obtaining the initial shell pressure of the battery.

[0084] Step S13, obtaining an impedance spectrum of the battery; and determining an equivalent circuit diagram according to the impedance spectrum.

[0085] Step S14, obtaining characteristic parameters in the equivalent circuit diagram; determining impedance parameters of the battery according to the characteristic parameters; and determining the impedance parameters as charge mass transfer impedance parameters.

[0086] Step S15, determining a detection threshold according to the initial shell pressure and the charge mass transfer impedance parameter.

[0087] Step S16, determining whether the detection threshold is less than or equal to the preset detection threshold, if so, executing step S17; otherwise, executing step S18.

[0088] Step S17, determining that the battery is a first corrosion risk battery.

[0089] Step S18, determining that the battery is a second corrosion risk battery, and the corrosion risk of the second corrosion risk battery is greater than the corrosion risk of the first corrosion risk battery.

[0090] Step S19, retaining the first corrosion risk battery.

[0091] Step S20, removing the second corrosion risk battery.

[0092] Step S21, repair the battery, and perform constant current charge and discharge cycles for a preset number of times to determine the coulomb efficiency change diagram and the repair shell pressure; verify the corrosion risk of the battery based on the coulomb efficiency change diagram, the repair shell pressure and the initial shell pressure.

[0093] According to the corrosion detection method of the battery in the embodiment of the present invention, on the basis of obtaining the initial shell pressure of the battery, the conduction mode of the battery is deeply detected based on the impedance detection technology, and the charge mass transfer impedance parameters of the battery are determined. The detection threshold that the negative electrode can pass through the shell is determined according to the initial shell pressure and the charge mass transfer impedance parameters, so as to accurately identify and eliminate batteries with higher corrosion risks according to the size of the detection threshold, and at the same time avoid batteries in a "false low shell pressure" state from being eliminated during production, prevent battery pack corrosion, and save costs.

[0094] Combine the following Figure 7 A battery corrosion detection device 2 according to an embodiment of the present invention is described.

[0095] like Figure 7 As shown, the battery corrosion detection device 2 of the embodiment of the present invention includes: an acquisition module 21, a first determination module 22 and a second determination module 23, wherein:

[0096] The acquisition module 21 is used to obtain the initial shell pressure and charge mass transfer impedance parameters of the battery; the first determination module 22 is used to determine the detection threshold according to the initial shell pressure and the charge mass transfer impedance parameters; the second determination module 23 is used to determine the corrosion risk of the battery according to the detection threshold.

[0097] According to the battery corrosion detection device 2 of the embodiment of the present invention, on the basis of obtaining the initial shell pressure of the battery, the conduction mode of the battery is deeply detected based on the impedance detection technology, and the charge mass transfer impedance parameters of the battery are determined. The detection threshold that the negative electrode can pass through the shell is determined according to the initial shell pressure and the charge mass transfer impedance parameters, so as to accurately identify and eliminate batteries with higher corrosion risks according to the size of the detection threshold, and at the same time avoid batteries in a "false low shell pressure" state from being eliminated during production, prevent battery pack corrosion, and save costs.

[0098] Combine the following Figure 8 A vehicle 3 according to an embodiment of the present invention will be described.

[0099] like Figure 8 As shown, the vehicle 3 according to the embodiment of the present invention comprises the battery corrosion detection device 2 according to the above embodiment.

[0100] According to the vehicle 3 of the embodiment of the present invention, on the basis of obtaining the initial shell pressure of the battery, the conduction mode of the battery is deeply detected based on the impedance detection technology, and the charge mass transfer impedance parameters of the battery are determined. The detection threshold that the negative electrode can pass through the shell is determined according to the initial shell pressure and the charge mass transfer impedance parameters, so as to accurately identify and eliminate batteries with higher corrosion risks according to the size of the detection threshold, and at the same time avoid batteries in a "false low shell pressure" state from being eliminated during production, prevent battery pack corrosion, and save costs.

[0101] The following describes a computer-readable storage medium according to an embodiment of the present invention.

[0102] A battery corrosion detection program is stored on a computer-readable storage medium in an embodiment of the present invention. When the battery corrosion detection program is executed by a processor, the battery corrosion detection method of the above embodiment is implemented.

[0103] The following describes a computer program product according to an embodiment of the present invention.

[0104] The computer program product of the embodiment of the present invention includes a computer program, and when the computer program is executed by a processor, the battery corrosion detection method of the above embodiment is implemented.

[0105] According to the computer program product of the embodiment of the present invention, on the basis of obtaining the initial shell pressure of the battery, the conduction mode of the battery is deeply detected based on the impedance detection technology, and the charge mass transfer impedance parameters of the battery are determined. The detection threshold that the negative electrode can pass through the shell is determined according to the initial shell pressure and the charge mass transfer impedance parameters, so as to accurately identify and eliminate batteries with higher corrosion risks according to the size of the detection threshold, and at the same time avoid batteries in a "false low shell pressure" state from being eliminated during production, prevent battery pack corrosion, and save costs.

[0106] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0107] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery corrosion detection method, characterized in that: include: Obtaining the initial shell pressure and charge mass transfer impedance parameters of the battery; determining a detection threshold according to the initial shell pressure and the charge mass transfer impedance parameter; The corrosion risk of the battery is determined according to the detection threshold.

2. The battery corrosion detection method according to claim 1, characterized in that: Obtaining the charge mass transfer impedance parameter of the battery, including: Obtaining an impedance spectrum of the battery; Determine an equivalent circuit diagram according to the impedance spectrum; The charge mass transfer impedance parameter is determined according to the equivalent circuit diagram.

3. The battery corrosion detection method according to claim 2, characterized in that: Determining the charge mass transfer impedance parameter according to the equivalent circuit diagram includes: Acquire characteristic parameters in the equivalent circuit diagram; Determining an impedance parameter of the battery according to the characteristic parameter; The impedance parameter is determined as the charge mass transfer impedance parameter.

4. The battery corrosion detection method according to claim 3, characterized in that: When determining the impedance parameter of the battery according to the characteristic parameter, the characteristic parameter is substituted into the following formula: Wherein, Z is the modulus value of the impedance parameter, ω is the frequency, C is the capacitance value, R is the impedance parameter, Z′ is the real part of the impedance parameter, Z" is the imaginary part of the impedance parameter, and φ is the angle between the imaginary part Z" of the impedance parameter and the modulus Z of the impedance parameter.

5. The battery corrosion detection method according to claim 1, characterized in that: When determining the detection threshold according to the initial shell pressure and the charge mass transfer impedance parameter, the initial shell pressure and the charge mass transfer impedance parameter are substituted into the following formula: including: I=U 负壳 / R ct Wherein, I is the detection threshold, and U 负壳 is the initial shell pressure, the R ct is the charge mass transfer impedance parameter.

6. The battery corrosion detection method according to claim 1, characterized in that: Determining the corrosion risk of the battery according to the detection threshold includes: The detection threshold is less than or equal to a preset detection threshold, and the battery is determined to be a first corrosion risk battery; The detection threshold is greater than a preset detection threshold, and the battery is determined to be a second corrosion risk battery, and the corrosion risk of the second corrosion risk battery is greater than the corrosion risk of the first corrosion risk battery.

7. The battery corrosion detection method according to claim 6, characterized in that: The method further comprises: When determining that the battery is a first corrosion risk battery, retaining the first corrosion risk battery; When it is determined that the battery is a second corrosion risk battery, the second corrosion risk battery is eliminated.

8. The battery corrosion detection method according to claim 1, characterized in that: After determining the corrosion risk of the battery according to the detection threshold, the method further includes: Repairing the battery, and performing constant current charge and discharge cycles for a preset number of times, and determining a coulomb efficiency change diagram and a repair shell pressure; The corrosion risk of the battery is verified according to the coulombic efficiency variation diagram, the repair shell pressure and the initial shell pressure.

9. The battery corrosion detection method according to claim 1, characterized in that: Before obtaining the charge mass transfer impedance parameter of the battery, the method further includes: The battery is charged at a constant current to a preset state of charge.

10. A battery corrosion detection device, characterized in that: include: An acquisition module, used to acquire the initial shell pressure and charge mass transfer impedance parameters of the battery; A first determination module, configured to determine a detection threshold according to the initial shell pressure and the charge mass transfer impedance parameter; The second determination module is used to determine the corrosion risk of the battery according to the detection threshold.

11. A vehicle, characterized in that: A corrosion detection device for a battery comprising the battery as claimed in claim 10.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a battery corrosion detection program, and when the battery corrosion detection program is executed by a processor, the battery corrosion detection method according to any one of claims 1 to 9 is implemented.

13. A computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the battery corrosion detection method according to any one of claims 1 to 9 is implemented.

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