A method for online self-detection of battery short circuit
Through the online self-test battery short-circuit method and automatic intelligent inspection technology, the short-circuit detection problems and complex manual calibration problems in lithium-ion cell production are solved, and equipment OEE improvement, product quality improvement and cost reduction are achieved.
Patent Information
- Application Number
- CN202411754413.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-04-08
AI Technical Summary
In the production process of lithium-ion battery cells, foreign matter such as burrs in the cutting end face of the electrode ear plate and dust in the production will cause direct conduction of the positive and negative electrodes, forming a short circuit. It is difficult for existing detection methods to accurately identify micro-short circuits, and manual calibration and inspection have problems such as complex operation, safety hazards and high cost.
The online self-test battery short-circuit method is adopted. By purchasing resistors near the upper and lower limit boundary value, relays are added to perform circuit switching, and automatic inspection is achieved using the program, automatic switching of the circuit and determining whether it meets the specification requirements, and testing results are generated and uploaded.
Automatic intelligent inspection has been realized, which reduces the downtime rate of equipment, improves equipment OEE, improves product quality, reduces batch accidents and secondary rework costs, and reduces sample preparation costs and safety accidents.
Smart Images
Figure CN119780763A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of lithium ion batteries, and in particular to an online self-detection method for battery short circuit. Background Art
[0002] In the production process of lithium-ion batteries, burrs on the cutting end faces of the pole tabs and foreign matter such as dust in the production process will penetrate the diaphragm, causing direct conduction between the positive and negative electrodes, forming a short circuit. During the short-circuit detection process, a short-term discharge phenomenon will occur inside the core. Due to the large variety of short-circuit equipment and different detection principles, the detection limits of defective cores with different discharge durations and different discharge amounts are also different. The micro-short circuit phenomenon inside the battery cell will be ignored by the instrument. In order to effectively identify defective cores and improve the cycle and safety performance of the battery cell, considering the complex circuit of the core, it is difficult to accurately measure various parameters, and it is difficult to directly judge the accuracy of the equipment detection results. Therefore, it is necessary to manually use the standard master regularly to compare with the actual measurement value of the equipment to determine the effectiveness of the instrument measurement detection, and simultaneously use higher-precision instruments to calibrate the test accuracy of the measuring equipment. The calibration and inspection process are all manual operations, and there are technical problems such as inadequate execution or non-execution leading to the escape of product quality defects, complex synchronous operation procedures, and equipment shutdown calibration and inspection affecting equipment OEE.
[0003] Therefore, there are mainly the following disadvantages: Disadvantage 1: Calibration inspection requires equipment shutdown, which affects equipment OEE; Disadvantage 2: The manual sample making machine produces OK and NG physical batteries for spot inspection and testing. The OK batteries are qualified samples and cannot be used multiple times, which affects the quality rate. Disadvantage 3: Relying on manual operation, the process is not executed properly or not executed, there are bugs and inaccurate measurements, and the product escapes downstream batch accidents causing secondary rework costs; Disadvantage 4: The test station is located inside the equipment, requiring the upper body of the person to extend into the equipment, and the small space is prone to safety accidents; Disadvantage 5: The calibration and inspection process is complicated and requires going in and out to operate the device's external screen. Summary of the invention
[0004] In response to the above technical problems, the present invention proposes an online self-check method for battery short circuit, which can replace manual operation, avoid uncontrollable factors that lead to product scrapping and increase in enterprise operating costs, simultaneously reduce equipment downtime rate and improve equipment OEE, and realize intelligent process self-checking and fool-proofing.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a method for online self-detection of battery short circuit, comprising the following steps: S1. Purchase resistors with values close to the upper and lower limits, calibrate and assign values to the resistors, and prepare samples. Connect the samples to the test instrument, and add relays between resistors and channels, and the relays are used for circuit switching. S2. Switch to the corresponding internal resistance signal and link it with the test instrument through the program. When the process changes, the specifications of the internal resistance are manually changed. The trigger conditions of "time mode" and "number mode" are reached in each shift to realize automatic inspection through program control; S3. Switch the circuit to the corresponding channel and determine whether it meets the specification requirements. If it does not meet the specification requirements, the equipment alarm prompts that the machine cannot be started for production; if it meets the specification requirements, production will be started, and the basic information such as test values, test results, time, and machine will be automatically generated and saved locally and uploaded to MES. At the same time, according to the program memory NG selection and qualified product receiving signals, it is determined whether to perform the selection work and select to the corresponding workstation.
[0006] Furthermore, in S1, fake resistors with values close to the upper and lower limits of process standard values are purchased from outside, and the actual internal resistance values of the purchased fake resistors are measured using high-precision instruments.
[0007] Furthermore, in S2, the "time mode" is when the set time is reached, the device triggers the conditional switching circuit to perform the short-circuit station calibration operation.
[0008] In "Number Mode", when the production quantity of the equipment is equal to the number of pieces produced by the equipment, the equipment triggers the condition to switch the short-circuit station circuit to perform calibration operation.
[0009] The online self-checking method for battery short circuit of the present invention replaces manual operation with automatic intelligent spot inspection, simplifies the operation process, can reduce downtime rate, improve equipment OEE, improve product quality, and reduce batch accidents and secondary rework costs of product escapes; secondly, it can reduce sample preparation costs, improve product quality rate, reduce the probability of safety accidents, and solve the problem of unexecuted or inadequately executed operations. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 A flow chart of a method for online self-detection of battery short circuit. DETAILED DESCRIPTION
[0011] See also Figure 1 The present invention provides a method for online self-detection of battery short circuit, comprising the following steps: S1. Purchase resistors with values close to the upper and lower limits, calibrate and assign values to the resistors, and prepare samples. Connect the samples to the test instrument, and add relays between resistors and channels, and the relays are used for circuit switching. S2. Switch to the corresponding internal resistance component signal and link it with the test instrument through the program (the information is connected to the test instrument). When the process changes, the specifications of the internal resistance component are manually changed (the connection adopts a quick plug connector). The "time mode" and "number mode" program control of each shift reaches the trigger condition to realize automatic inspection; S3. Switch the circuit to the corresponding channel and determine whether it meets the specification requirements. If it does not meet the specification requirements, the equipment alarm prompts that the machine cannot be started for production; if it meets the specification requirements, production will be started, and the basic information such as test values, test results, time, and machine will be automatically generated and saved locally and uploaded to MES. At the same time, according to the program memory NG selection and qualified product receiving signals, it is determined whether to perform the selection work and select to the corresponding workstation.
[0012] Among them, in S1, fake resistors with values close to the upper and lower limits of process standard values (resistance specification value = process document standard value) are purchased from outside, and the actual internal resistance values of the purchased fake resistors are measured using high-precision instruments.
[0013] In S1, the sample preparation for calibrating and assigning values to the resistor includes repeatedly measuring the actual resistance of the resistor 31 times to obtain the mean value, and assigning the actual value to the resistor. The resistor connection method adopts a quick plug or clamp mode. If the product process specifications change later, the resistor specifications can be switched and the resistor can be replaced.
[0014] In S1, the resistor and the resistor element switch the total circuit to increase the relay.
[0015] Among them, in S2, the "time mode" is that when the set time is reached, the device triggers the condition to switch the circuit to perform the short-circuit station calibration operation.
[0016] In "Number Mode", when the production quantity of the equipment is equal to the number of pieces produced by the equipment, the equipment triggers the condition to switch the short-circuit station circuit to perform calibration operation.
[0017] The present invention provides a method for online self-checking battery short circuit. First, it is necessary to sort out the qualified and NG internal resistance test standards of bare battery cells and airbag cells, as well as the allowable error; design the critical value qualified and NG false resistance and use high-precision instruments for measurement and assignment, and link the resistor to the relay, and connect the relay to the signal line of the measuring instrument. Secondly, through the electrical principle control logic, the program switches to the corresponding internal resistance signal and the test instrument linkage (information is connected to the test instrument), and the internal resistance specification is manually changed when the process changes (the connection uses a quick plug connector). Thirdly, the program control of the set trigger conditions "time mode" and "number mode" is achieved to realize automatic inspection; switch the circuit signal and determine whether it meets the specification requirements. If it does not meet the specification requirements, the equipment alarm prompts that it cannot start production; the inspection results, values, time and other information are automatically generated and saved locally and uploaded to MES, so as to verify the effectiveness of the measuring instrument instead of manual inspection. Finally, according to the measured internal resistance specification value, the program memorizes the NG selection and qualified product reception signals, determines whether to perform the selection work and selects to the corresponding workstation.
[0018] The online self-checking method for battery short circuit of the present invention replaces manual operation with automatic intelligent spot inspection, simplifies the operation process, can reduce downtime rate, improve equipment OEE, improve product quality, and reduce batch accidents and secondary rework costs of product escapes; secondly, it can reduce sample preparation costs, improve product quality rate, reduce the probability of safety accidents, and solve the problem of unexecuted or inadequately executed operations.
[0019] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not limited to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for online self-detection of battery short circuit, characterized in that: The following steps are involved: S1. Purchase resistors with values close to the upper and lower limits, calibrate and assign values to the resistors, and prepare samples. Connect the samples to the test instrument, and add relays between resistors and channels, and the relays are used for circuit switching. S2, through the program switch to the corresponding internal resistance signal and the test instrument linkage, when the process changes, the specifications of the internal resistance are manually changed, and the trigger conditions of each shift are reached, the "time mode" and "number mode" program control is realized to realize automatic inspection; S3. Switch the circuit to the corresponding channel and determine whether it meets the specification requirements. If it does not meet the specification requirements, the equipment alarm prompts that the machine cannot be started for production; if it meets the specification requirements, production will be started, and the basic information such as test values, test results, time, and machine will be automatically generated and saved locally and uploaded to MES. At the same time, according to the program memory NG selection and qualified product receiving signals, it is determined whether to perform the selection work and select to the corresponding workstation.
2. The method for online self-testing of battery short circuit as claimed in claim 1, characterized in that: In S1, fake resistors with values close to the upper and lower limits of process standard values are purchased from outside, and the actual internal resistance values of the purchased fake resistors are measured using high-precision instruments.
3. The method for online self-testing of battery short circuit according to claim 1, characterized in that: In S2, "time mode" means that when the set time is reached, the device triggers the condition to switch the circuit to perform the short-circuit station calibration operation; "Number mode" means that when the equipment production quantity is equal to the equipment production number, the equipment triggers the condition to switch the short-circuit station circuit to perform calibration operation.