An OCV probe disconnection detection method, system, device and medium

Abstract

The present invention provides an OCV probe disconnection detection method, system, device and medium in the technical field of lithium battery detection. The method includes the following steps: Step S10: Set a first resistance value, a second resistance value and a voltage threshold, where the first resistance value is greater than the second resistance value; Step S20: Set the input impedance of the voltmeter to the first resistance value, and the voltmeter performs a primary voltage measurement on the lithium battery through the OCV probe to obtain a first voltage value; Step S30: Set the input impedance of the voltmeter to the second resistance value, and the voltmeter performs a secondary voltage measurement on the lithium battery through the OCV probe to obtain a second voltage value; Step S40: Detect whether the OCV probe is disconnected based on the voltage threshold, the first voltage value and the second voltage value. The advantages of the present invention are: greatly improving the efficiency and quality of OCV probe disconnection detection.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery detection, and particularly to an OCV probe disconnection detection method, system, device and medium. Background Art

[0002] In order to produce lithium batteries with high safety and excellent performance, a series of detections need to be carried out on the lithium batteries by using OCV detection equipment after production, such as detecting the internal impedance to judge the performance of the lithium battery and detecting the open circuit voltage to judge the safety of the lithium battery.

[0003] The OCV detection equipment is connected to the positive and negative electrode posts of the lithium battery through the OCV probe for corresponding detections. When the line of the OCV probe is disconnected, it will directly affect the accuracy of the measurement results, lead to misjudgment of unqualified products, and affect the service life of the entire lithium battery. Therefore, it is necessary to detect whether the OCV probe is disconnected.

[0004] For the detection of OCV probe disconnection, traditionally, the method of visual inspection or pulling is used to judge whether the line is disconnected. This method cannot be operated online, resulting in low efficiency and easy misjudgment.

[0005] Therefore, how to provide an OCV probe disconnection detection method, system, device and medium to improve the efficiency and quality of OCV probe disconnection detection has become an urgent technical problem to be solved. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an OCV probe disconnection detection method, system, device and medium to improve the efficiency and quality of OCV probe disconnection detection.

[0007] In a first aspect, the present invention provides an OCV probe disconnection detection method, including the following steps:

[0008] Step S10: Set a first resistance value, a second resistance value and a voltage threshold, where the first resistance value is greater than the second resistance value;

[0009] Step S20: Set the input impedance of the voltmeter to the first resistance value, and the voltmeter measures the voltage of the lithium battery once through the OCV probe to obtain a first voltage value;

[0010] Step S30: Set the input impedance of the voltmeter to the second resistance value, and the voltmeter measures the voltage of the lithium battery twice through the OCV probe to obtain a second voltage value;

[0011] Step S40: Detect whether the OCV probe is disconnected based on the voltage threshold, the first voltage value and the second voltage value.

[0012] Further, in the step S10, the first resistance value is greater than or equal to 10 GΩ, and the second resistance value is one-thousandth of the first resistance value.

[0013] Further, in the step S10, the voltage threshold is 1 V.

[0014] Further, the step S40 is specifically as follows:

[0015] Calculate the absolute difference between the first voltage value and the second voltage value, and determine whether the absolute difference is greater than the voltage threshold. If so, generate a detection result of OCV probe disconnection; if not, generate a detection result of OCV probe not being disconnected.

[0016] In a second aspect, the present invention provides an OCV probe disconnection detection system, including the following modules:

[0017] A parameter setting module, configured to set a first resistance value, a second resistance value, and a voltage threshold, where the first resistance value is greater than the second resistance value;

[0018] A primary voltage measurement module, configured to set the input impedance of a voltmeter to the first resistance value, and the voltmeter performs a primary voltage measurement on a lithium battery through an OCV probe to obtain a first voltage value;

[0019] A secondary voltage measurement module, configured to set the input impedance of the voltmeter to the second resistance value, and the voltmeter performs a secondary voltage measurement on the lithium battery through the OCV probe to obtain a second voltage value;

[0020] A disconnection detection module, configured to detect whether the OCV probe is disconnected based on the voltage threshold, the first voltage value, and the second voltage value.

[0021] Further, in the parameter setting module, the first resistance value is greater than or equal to 10 GΩ, and the second resistance value is one-thousandth of the first resistance value.

[0022] Further, in the parameter setting module, the voltage threshold is 1 V.

[0023] Further, the disconnection detection module is specifically configured to:

[0024] Calculate the absolute difference between the first voltage value and the second voltage value, and determine whether the absolute difference is greater than the voltage threshold. If so, generate a detection result of OCV probe disconnection; if not, generate a detection result of OCV probe not being disconnected.

[0025] In a third aspect, the present invention provides an OCV probe disconnection detection device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the method described in the first aspect is implemented.

[0026] In a fourth aspect, the present invention provides an OCV probe open - circuit detection medium, on which a computer program is stored, and when the program is executed by a processor, the method described in the first aspect is implemented.

[0027] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0028] When setting the input impedance of the voltmeter to a first resistance value, a first voltage value is obtained by performing a first voltage measurement on the lithium - ion battery through the OCV probe. When setting the input impedance of the voltmeter to a second resistance value, a second voltage value is obtained by performing a second voltage measurement on the lithium - ion battery through the OCV probe. Then, calculate the absolute difference between the first voltage value and the second voltage value, and compare the size relationship between the absolute difference and a pre - set voltage threshold to determine whether the OCV probe is open - circuited. By setting the first resistance value to be greater than or equal to 10 GΩ to overcome the influence of the output impedance of the lithium - ion battery, the voltage detection accuracy is improved, and misjudgment is avoided. Specifically, during implementation, multiple voltmeters can be used to perform batch on - line detection on multiple OCV probes, ultimately greatly improving the efficiency and quality of OCV probe open - circuit detection.

[0029] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specifically illustrates the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings in conjunction with the embodiments.

[0031] Figure 1 is a flowchart of a method for detecting an open - circuit of an OCV probe according to the present invention.

[0032] Figure 2 is a schematic structural diagram of a system for detecting an open - circuit of an OCV probe according to the present invention.

[0033] Figure 3 is a schematic structural diagram of a device for detecting an open - circuit of an OCV probe according to the present invention.

[0034] Figure 4 is a schematic structural diagram of a medium for detecting an open - circuit of an OCV probe according to the present invention.

[0035] Figure 5 is an equivalent circuit diagram for open - circuit detection according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] By providing a method, system, device and medium for detecting an open - circuit of an OCV probe in the embodiments of the present application, the efficiency and quality of OCV probe open - circuit detection are improved.

[0037] The overall idea of the technical solution in the embodiments of this application is as follows: By adjusting the input impedance of the voltmeter, the lithium battery is voltage-measured twice through the OCV probe. Whether the OCV probe is disconnected is judged based on the magnitude relationship between the absolute difference of the two measurement results and the voltage threshold. Multiple OCV probes can be batch-tested online. By setting the first resistance value to be greater than or equal to 10 GΩ to overcome the influence of the output impedance of the lithium battery, the efficiency and quality of the OCV probe disconnection detection are improved.

[0038] Embodiment 1

[0039] This embodiment provides a method for detecting disconnection of an OCV probe, as Figure 1 、 5 shown, including the following steps:

[0040] Step S10: Set a first resistance value, a second resistance value, and a voltage threshold, where the first resistance value is greater than the second resistance value; the first resistance value is much greater than the input impedance of the lithium battery;

[0041] Step S20: Set the input impedance of the voltmeter to the first resistance value, and the voltmeter measures the voltage of the lithium battery once through the OCV probe to obtain a first voltage value;

[0042] Step S30: Set the input impedance of the voltmeter to the second resistance value, and the voltmeter measures the voltage of the lithium battery twice through the OCV probe to obtain a second voltage value;

[0043] Step S40: Detect whether the OCV probe is disconnected based on the voltage threshold, the first voltage value, and the second voltage value. That is, whether the OCV probe is disconnected is judged by measuring two sets of voltage data.

[0044] In the step S10, the first resistance value is greater than or equal to 10 GΩ, and the second resistance value is one-thousandth of the first resistance value.

[0045] When the output impedance of the lithium battery is large, it will divide the voltage with the input impedance of the voltmeter. To avoid being interfered by the output impedance, the input impedance is set to more than 10 GΩ to greatly reduce the influence of the output impedance of the lithium battery, improve the accuracy of voltage measurement, and further improve the accuracy of the OCV probe disconnection detection.

[0046] When the OCV probe is disconnected, since the capacitor in the voltmeter basically does not discharge, a value similar to the just-measured voltage value can still be measured, resulting in measurement errors. To solve this problem, switch the input impedance of the voltmeter to the second resistance value for secondary measurement, and calculate the absolute difference between the two measurements. If the absolute difference is less than 1 V, the circuit is normal; if the absolute difference is greater than 1 V, the circuit is disconnected.

[0047] In the step S10, the voltage threshold is 1V.

[0048] The step S40 is specifically as follows:

[0049] Calculate the absolute difference between the first voltage value and the second voltage value, and determine whether the absolute difference is greater than the voltage threshold. If so, generate a detection result of OCV probe disconnection; if not, generate a detection result of OCV probe not being disconnected.

[0050] Embodiment 2

[0051] This embodiment provides an OCV probe disconnection detection system, as Figure 2 、 5 shown, including the following modules:

[0052] A parameter setting module for setting a first resistance value, a second resistance value, and a voltage threshold, where the first resistance value is greater than the second resistance value; the first resistance value is much greater than the input impedance of the lithium battery;

[0053] A primary voltage measurement module for setting the input impedance of the voltmeter to the first resistance value, and the voltmeter performs a primary voltage measurement on the lithium battery through the OCV probe to obtain a first voltage value;

[0054] A secondary voltage measurement module for setting the input impedance of the voltmeter to the second resistance value, and the voltmeter performs a secondary voltage measurement on the lithium battery through the OCV probe to obtain a second voltage value;

[0055] A disconnection detection module for detecting whether the OCV probe is disconnected based on the voltage threshold, the first voltage value, and the second voltage value. That is, by measuring two sets of voltage data to determine whether the OCV probe is disconnected.

[0056] In the parameter setting module, the first resistance value is greater than or equal to 10 GΩ, and the second resistance value is one-thousandth of the first resistance value.

[0057] When the output impedance of the lithium battery is large, it will divide the voltage with the input impedance of the voltmeter. To avoid the interference of the output impedance, the input impedance is set to more than 10 GΩ to greatly reduce the influence of the lithium battery output impedance, improve the accuracy of voltage measurement, and further improve the accuracy of OCV probe disconnection detection.

[0058] When the OCV probe is disconnected, since the capacitor in the voltmeter basically does not discharge, a value similar to the just-measured voltage value can still be measured, resulting in measurement errors. To solve this problem, switch the input impedance of the voltmeter to the second resistance value for secondary measurement, and calculate the absolute difference between the two measurements. If the absolute difference is less than 1V, the line is normal; if the absolute difference is greater than 1V, the line is disconnected.

[0059] In the parameter setting module, the voltage threshold is 1V.

[0060] The disconnection detection module is specifically configured to:

[0061] Calculate the absolute difference between the first voltage value and the second voltage value, and determine whether the absolute difference is greater than the voltage threshold. If so, generate a detection result indicating that the OCV probe is disconnected; if not, generate a detection result indicating that the OCV probe is not disconnected.

[0062] Based on the same inventive concept, this application provides an electronic device embodiment corresponding to Embodiment 1. For details, see Embodiment 3.

[0063] Embodiment 3

[0064] This embodiment provides an OCV probe disconnection detection device, as Figure 3 shown, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, any implementation manner in Embodiment 1 can be realized.

[0065] Since the electronic device introduced in this embodiment is the device used to implement the method in Embodiment 1 of this application, based on the method introduced in Embodiment 1 of this application, those skilled in the art can understand the specific implementation manner and various variations of the electronic device in this embodiment. Therefore, the specific implementation of how this electronic device realizes the method in the embodiments of this application will not be described in detail here. As long as the device used by those skilled in the art to implement the method in the embodiments of this application belongs to the scope protected by this application.

[0066] Based on the same inventive concept, this application provides a storage medium corresponding to Embodiment 1. For details, see Embodiment 4.

[0067] Embodiment 4

[0068] This embodiment provides an OCV probe disconnection detection medium, as Figure 4 shown, on which a computer program is stored. When the computer program is executed by a processor, any implementation manner in Embodiment 1 can be realized.

[0069] The technical solutions provided in the embodiments of this application at least have the following technical effects or advantages:

[0070] When the input impedance of the voltmeter is set to the first resistance value, a first voltage value is obtained by measuring the voltage of the lithium battery once with the OCV probe. When the input impedance of the voltmeter is set to the second resistance value, a second voltage value is obtained by measuring the voltage of the lithium battery twice with the OCV probe. Then, calculate the absolute difference between the first voltage value and the second voltage value, and compare the absolute difference with the pre-set voltage threshold to determine whether the OCV probe is disconnected. By setting the first resistance value to be greater than or equal to 10 GΩ, the influence of the output impedance of the lithium battery can be overcome, the voltage detection accuracy can be improved, and misjudgment can be avoided. In specific implementation, multiple OCV probes can be batch online detected by multiple voltmeters, ultimately greatly improving the efficiency and quality of the OCV probe disconnection detection.

[0071] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0072] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, apparatuses (systems), and computer program products of the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the specified functions in Figure 1 one or more of these processes Figure 1 or multiple processes and / or blocks

[0073] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device that implements the specified functions in Figure 1 one or more of these processes Figure 1 or multiple processes and / or blocks

[0074] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are executed on the computer or other programmable apparatus to produce a computer-implemented process, thereby the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one process or a plurality of processes and / or blocks Figure 1 one process or a plurality of processes and / or blocks Figure 1 steps of the functions specified in one block or a plurality of blocks.

[0075] Although the specific embodiments of the present invention have been described above, those skilled in the art of this technology should understand that the specific embodiments we described are illustrative only and not used to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. An OCV probe open - circuit detection method, characterized in that: It includes the following steps: Step S10: Set a first resistance value, a second resistance value, and a voltage threshold, where the first resistance value is greater than the second resistance value; Step S20: Set the input impedance of the voltmeter to the first resistance value, and the voltmeter performs a first voltage measurement on the lithium battery through the OCV probe to obtain a first voltage value; Step S30: Set the input impedance of the voltmeter to the second resistance value, and the voltmeter performs a second voltage measurement on the lithium battery through the OCV probe to obtain a second voltage value; Step S40: Detect whether the OCV probe is broken based on the voltage threshold, the first voltage value, and the second voltage value; The specific content of step S40 is as follows: Calculate the absolute difference between the first voltage value and the second voltage value, and determine whether the absolute difference is greater than the voltage threshold. If so, generate a detection result that the OCV probe is broken; if not, generate a detection result that the OCV probe is not broken.

2. The OCV probe open - circuit detection method according to claim 1, characterized in that: In step S10, the first resistance value is greater than or equal to 10 GΩ, and the second resistance value is one-thousandth of the first resistance value.

3. The OCV probe open - circuit detection method according to claim 1, characterized in that: In step S10, the voltage threshold is 1 V.

4. An OCV probe open - circuit detection system, characterized in that: It includes the following modules: A parameter setting module for setting a first resistance value, a second resistance value, and a voltage threshold, where the first resistance value is greater than the second resistance value; A first voltage measurement module for setting the input impedance of the voltmeter to the first resistance value, and the voltmeter performs a first voltage measurement on the lithium battery through the OCV probe to obtain a first voltage value; A second voltage measurement module for setting the input impedance of the voltmeter to the second resistance value, and the voltmeter performs a second voltage measurement on the lithium battery through the OCV probe to obtain a second voltage value; A breakage detection module for detecting whether the OCV probe is broken based on the voltage threshold, the first voltage value, and the second voltage value; The breakage detection module is specifically used for: Calculate the absolute difference between the first voltage value and the second voltage value, and determine whether the absolute difference is greater than the voltage threshold. If so, generate a detection result that the OCV probe is broken; if not, generate a detection result that the OCV probe is not broken.

5. The OCV probe open - circuit detection system according to claim 4, characterized in that: In the parameter setting module, the first resistance value is greater than or equal to 10 GΩ, and the second resistance value is one-thousandth of the first resistance value.

6. The OCV probe open - circuit detection system according to claim 4, characterized in that: In the parameter setting module, the voltage threshold is 1 V.

7. An OCV probe open - circuit detection device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method described in any one of claims 1 to 3.

8. An OCV probe open - circuit detection medium, on which a computer program is stored, characterized in that, When the program is executed by the processor, it implements the method described in any one of claims 1 to 3.

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