CN113884886A - Method for screening abnormal charging and discharging core in battery test production - Google Patents
Method for screening abnormal charging and discharging core in battery test production Download PDFInfo
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- 238000012216 screening Methods 0.000 title claims abstract description 17
- 238000007600 charging Methods 0.000 title claims abstract description 13
- 238000007599 discharging Methods 0.000 title claims abstract description 13
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Abstract
The invention discloses a method for screening abnormal charge and discharge cells in battery test production, which comprises the following steps: charging or discharging a battery cell on battery test equipment, collecting primary battery voltage, marking the primary battery voltage as a reference point or collecting and recording the primary battery voltage; acquiring whether the sampling voltage is larger than a reference point value; judging whether the voltage value is reduced compared with the previously acquired data; if not, shifting out the foremost data when the data values from the datum point to the current sampling are within the specified statistical range; determining the reference point again; and operating all data points behind the datum point; the invention has the beneficial effects that the data of all abnormal points are counted: the change of the voltage is monitored in the process of charging or discharging the battery cell on the battery testing equipment, so that the accuracy of detecting the abnormity of the battery can be improved, the condition of missed detection is reduced, and the quality of the battery is improved.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of battery testing, in particular to a method for screening abnormal charging and discharging cores in battery testing production.
[ background of the invention ]
Nowadays, green, high-efficiency secondary batteries are vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like. In the production process of the power battery, foreign matters are introduced or the battery core is damaged by collision, if the battery core is made into a finished battery, the battery core is not different from a normal battery core under the state of short circuit in the battery core, but slight short circuit occurs in the battery core, if the abnormal battery core is taken off and assembled in a whole vehicle, great potential safety hazard is formed, and the battery core can lose effectiveness at any time due to the internal short circuit, so that the abnormal battery with the slight short circuit in the interior is picked out, which is particularly important;
the conventional abnormal cell selection mode is to screen the abnormal cells by using a mode of normal-temperature storage and voltage drop calculation after the formation or capacity of the cells. Because power batteries, especially the electric core with the double-winding core or the four-winding core with larger capacity, are connected in parallel, the voltages of the positive electrode and the negative electrode of each winding core of the battery are the same, even if one winding core is in a micro short circuit due to an accident, the voltages of other winding cores cannot change rapidly, if the abnormal electric core is detected by continuously monitoring the voltage drop of the positive electrode and the negative electrode, the detection sensitivity is relatively lower, and the possibility of missing detection exists.
[ summary of the invention ]
The invention aims to solve the defects of the technical problems and provides a novel method for screening abnormal charging and discharging cores in battery test production.
The invention is realized by the following technical scheme:
a method for screening abnormal charge and discharge cores in battery test production comprises the following steps:
s1: charging or discharging a battery cell on battery test equipment, collecting primary battery voltage, and marking the primary battery voltage as a reference point;
s2: charging or discharging a battery cell on battery testing equipment, and acquiring and recording primary battery voltage;
s3: acquiring whether the sampling voltage is greater than a reference value or not in the step S2; if yes, updating the reference point to the record value in step S2; continuing the charge and discharge and returning to step S2;
s4: if not, judging whether the voltage value is decreased compared with the previous acquired data in the step S2 or not according to the step S3; if so, judging that the difference value between the reference point value and the reference point value is greater than a set value; if not, marking the record value in the step S2 as an abnormal point; if not, performing step S6;
s5: judging whether the voltage value is reduced compared with the previous acquired data in the step S2 or not according to the condition that the voltage value is not reduced in the step S3; if not, performing step S6;
s6: shifting out the foremost data when the data values from the reference point to the current sampling reach a specified statistical range; determining the reference point again; and performing the operations of step S3 and step S4 on all data points after the datum point;
s7: counting all abnormal point data, judging whether the set number is reached, if so, stopping the channel; if not; the charge and discharge are continued, and the flow returns to step S2.
As a further scheme of the invention: the reference voltage determination in step S3 includes the following steps:
(1) firstly, setting the voltage acquired for the first time as a reference voltage;
(2) comparing the voltage value acquired newly with the current reference point, and if the voltage value is larger than the current reference point, updating the reference to be a new acquired value; otherwise, the datum value is unchanged;
(3) if the current reference point value is 3.012V and the new sampling voltage is 3.112V, updating the reference point value to be 3.112V;
(4) if the current reference point value is 3.012V and the new sampling voltage is 2.963V, the reference point is not updated; still 3.012V;
as a further scheme of the invention: judging within the range of the total number of data: if the total number range of the data is 10, comparing every 10 data points; if the 1 st point to the 10 th point are judgment ranges and the 2 nd point to the 11 th point are judgment ranges, the number of the abnormal points in the range judgment ranges reaches the set number, the test is stopped, and the like.
As a further scheme of the invention: setting an error value of the abnormal point; if the set error value is 0.012V, the voltage value and the reference point deviation reaches 0.012V, which is the abnormal point.
As a further scheme of the invention: if the number of the abnormal points is set to be 3, stopping testing when the number of the abnormal points reaches 3; the maximum abnormal point number is the data number of the judgment range; if the range is 10, the maximum number of outliers is 10.
As a further scheme of the invention: the determination process of the abnormal point in the steps S4, S5:
(1) comparing the current sampling voltage with the previous sampling voltage value, and if the current sampling voltage is smaller than the previous sampling voltage value, comparing the current sampling voltage with the reference point;
(2) if the absolute value of the difference value with the reference point is larger than the set error value, the result is abnormal; otherwise, the operation is normal;
(3) if the current reference point value is 3.200V, the previous sampling voltage value is 3.111V, the current sampling voltage value is 3.011V, the 3.011V is less than 3.111V and is judged to be descending, and the absolute value of 3.011V-3.200V is-0.189V, and-0.189V is 0.189V; assuming that the set error value is 0.09V, 0.189 is greater than 0.09, and 3.011 is an abnormal point, wherein the set error value is set according to the actual battery condition.
As a further scheme of the invention: in the step S7, counting the number of abnormal points, if the number of abnormal points is 3, and if it is determined that the number of abnormal points reaches 3, stopping the test protection; the number 3 is set according to the actual condition of the battery.
As a further scheme of the invention: carrying out segmentation processing on the judgment range;
(1) voltage segmentation mode:
1) if the voltage is between 1V and 2V, setting the deviation value to be 0.03V and 7 abnormal point data;
2) if the voltage is between 2V and 3V, setting the deviation value to be 0.01V and the number of abnormal point data to be 5;
(2) capacity segmentation mode:
1) if the capacity is 0-1000mAh, setting the deviation value to be 0.03V and 7 abnormal point data;
2) if the voltage is 1000mAh to 2000mAh, the deviation value is set to be 0.01V, and the number of the abnormal point data is 5.
The invention has the beneficial effects that: the change of the voltage is monitored in the process of charging or discharging the battery cell on the battery testing equipment, so that the accuracy of detecting the abnormity of the battery can be improved, the condition of missed detection is reduced, and the quality of the battery is improved.
[ description of the drawings ]
FIG. 1 is a schematic diagram of a method for screening abnormal charge/discharge cells in battery test production according to the present invention;
FIG. 2 is a schematic flow chart of a method for screening abnormal charge/discharge cells in battery test production according to the present invention;
FIG. 3 is a schematic diagram of an embodiment 1 of the abnormal point of voltage drop according to the present invention;
FIG. 4 is a diagram of an embodiment 2 of the abnormal point of voltage drop according to the present invention.
[ detailed description ] embodiments
The present invention will be further described with reference to the accompanying drawings and detailed description, wherein the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, in an embodiment of the present invention, a method for screening an abnormal charge/discharge cell in battery test production includes the following steps:
s1: charging or discharging a battery cell on battery test equipment, collecting primary battery voltage, and marking the primary battery voltage as a reference point;
s2: charging or discharging a battery cell on battery testing equipment, and acquiring and recording primary battery voltage;
s3: acquiring whether the sampling voltage is greater than a reference value or not in the step S2; if yes, updating the reference point to the record value in step S2; continuing the charge and discharge and returning to step S2;
s4: if not, judging whether the voltage value is decreased compared with the previous acquired data in the step S2 or not according to the step S3; if so, judging that the difference value between the reference point value and the reference point value is greater than a set value; if not, marking the record value in the step S2 as an abnormal point; if not, performing step S6;
s5: judging whether the voltage value is reduced compared with the previous acquired data or not in the step S2 according to the fact that the voltage value is not reduced in the step S3; if not, performing step S6;
s6: shifting out the foremost data when the data values from the reference point to the current sampling reach a specified statistical range; determining the reference point again; and performing the operations of step S3 and step S4 on all data points after the datum point;
s7: counting all abnormal point data, judging whether the set number is reached, if so, stopping the channel; if not; the charge and discharge are continued, and the flow returns to step S2.
The reference voltage determination in step S3 includes the following steps:
(1) firstly, setting the voltage acquired for the first time as a reference voltage;
(2) comparing the voltage value acquired newly with the current reference point, and if the voltage value is larger than the current reference point, updating the reference to be a new acquired value; otherwise, the datum value is unchanged;
(3) if the current reference point value is 3.012V and the new sampling voltage is 3.112V, updating the reference point value to be 3.112V;
(4) if the current reference point value is 3.012V and the new sampling voltage is 2.963V, the reference point is not updated; still 3.012V;
referring to fig. 3, in the embodiment of the present invention, the determination is performed within the range of the total number of data: if the total number range of the data is 10, comparing every 10 data points; if the 1 st to 10 th points are the determination range and the 2 nd to 11 th points are the determination range, the number of abnormal points in the range determination range reaches the set number, the test is stopped, the voltage is increased and changed during constant current charging, when the 2 nd point is smaller than the 1 st point, the 1 st point is a reference point, but when the 4 th point is smaller than the 3 rd point and the 3 rd point is larger than all the previous points, the 3 rd point becomes the reference point, and similarly, when the 6 th point is smaller than the 5 th point and the 5 th point is larger than all the previous points, the 5 th point becomes the reference point. Since (voltage of reference point-voltage of 6 th point) >0.3mV, the 6 th point is an abnormal point, and similarly, the 7 th and 8 th points are also abnormal points. Since there are 3 such voltage drop outliers out of the 10 points, and the errors are all greater than 0.3mV, the testing of the channel should be stopped, and so on.
Setting an error value of the abnormal point; if the set error value is 0.012V, the voltage value and the reference point deviation reaches 0.012V, which is the abnormal point.
Referring to fig. 4, in the embodiment of the present invention, if the number of the abnormal points is set to 3, the test is stopped when the number of the abnormal points reaches 3; the maximum abnormal point number is the data number of the judgment range; if the range is 10, the maximum number of abnormal points is 10; since the voltage is changed in an increasing manner during constant current charging, when the 3 rd point is smaller than the 2 nd point, the 2 nd point is a reference point, and since (voltage of reference point-voltage of 3 rd point) >0.3mV, the 3 rd point is an abnormal point, and similarly, the 4 th point is also an abnormal point. Since there are only 2 such voltage drop abnormal points from the 1 st to 10 th points, but the 11 nd point is also an abnormal point from the 2 nd to 11 th points because the 11 th point is smaller than the 10 th point and the 10 th point is smaller than the 2 nd point, at this time, the 2 nd point is still the reference point, (voltage of the reference point-voltage of the 11 th point) >0.3 mV. Since there are 3 such voltage drop abnormal points in the 10 points 2 to 11, and the errors are all larger than 0.3mV, the test of the channel should be stopped.
In the embodiment of the present invention, the determination process of the abnormal point in the steps S4 and S5 includes:
(1) comparing the current sampling voltage with the previous sampling voltage value, and if the current sampling voltage is smaller than the previous sampling voltage value, comparing the current sampling voltage with the reference point;
(2) if the absolute value of the difference value with the reference point is larger than the set error value, the result is abnormal; otherwise, the operation is normal;
(3) if the current reference point value is 3.200V, the previous sampling voltage value is 3.111V, the current sampling voltage value is 3.011V, the 3.011V is less than 3.111V and is judged to be descending, and the absolute value of 3.011V-3.200V is-0.189V, and-0.189V is 0.189V; assuming that the set error value is 0.09V, 0.189 is greater than 0.09, and 3.011 is an abnormal point, wherein the set error value is set according to the actual battery condition.
In the step S7, counting the number of abnormal points, if the number of the set abnormal points is 3, and when it is determined that the number of the abnormal points reaches 3, the test protection is stopped; the number 3 is set according to the actual condition of the battery.
In the embodiment of the invention, the judgment range is subjected to segmentation processing;
(1) voltage segmentation mode:
1) if the voltage is between 1V and 2V, setting the deviation value to be 0.03V and 7 abnormal point data;
2) if the voltage is between 2V and 3V, setting the deviation value to be 0.01V and the number of abnormal point data to be 5;
(2) capacity segmentation mode:
1) if the capacity is 0-1000mAh, setting the deviation value to be 0.03V and 7 abnormal point data;
2) if the voltage is 1000mAh to 2000mAh, the deviation value is set to be 0.01V, and the number of the abnormal point data is 5.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
1. A method for screening abnormal charge and discharge cores in battery test production is characterized by comprising the following steps:
s1: charging or discharging a battery cell on battery test equipment, collecting primary battery voltage, and marking the primary battery voltage as a reference point;
s2: charging or discharging a battery cell on battery testing equipment, and acquiring and recording primary battery voltage;
s3: acquiring whether the sampling voltage is greater than a reference value or not in the step S2; if yes, updating the reference point to the record value in step S2; continuing the charge and discharge and returning to step S2;
s4: if not, judging whether the voltage value is decreased compared with the previous acquired data in the step S2 or not according to the step S3; if so, judging that the difference value between the reference point value and the reference point value is greater than a set value; if not, marking the value in the step S2 as an abnormal point; if not, performing step S6;
s5: judging whether the voltage value is reduced compared with the previous acquired data in the step S2 or not according to the condition that the voltage value is not reduced in the step S3; if not, performing step S6;
s6: shifting out the foremost data when the data values from the reference point to the current sampling reach a specified statistical range; determining the reference point again; and performing the operations of step S3 and step S4 on all data points after the datum point;
s7: counting all abnormal point data, judging whether the set number is reached, if so, stopping the channel; if not; the charge and discharge are continued, and the flow returns to step S2.
2. The method for screening the abnormal charge and discharge core in the battery test production according to claim 1, wherein the reference voltage determination in the step S3 includes the following steps:
(1) firstly, setting the voltage acquired for the first time as a reference voltage;
(2) comparing the voltage value acquired newly with the current reference point, and if the voltage value is larger than the current reference point, updating the reference to be a new acquired value; otherwise, the datum value is unchanged;
(3) if the current reference point value is 3.012V and the new sampling voltage is 3.112V, updating the reference point value to be 3.112V;
(4) if the current reference point value is 3.012V and the new sampling voltage is 2.963V, the reference point is not updated; still 3.012V.
3. The method for screening abnormal charge and discharge cells in battery test production according to claim 1, characterized in that: judging within the range of the total number of data: if the total number range of the data is 10, comparing every 10 data points; if the 1 st point to the 10 th point are judgment ranges and the 2 nd point to the 11 th point are judgment ranges, the number of the abnormal points in the range judgment ranges reaches the set number, the test is stopped, and the like.
4. The method for screening abnormal charge and discharge cells in battery test production according to claim 3, wherein: setting an error value of the abnormal point; if the set error value is 0.012V, the voltage value and the reference point deviation reaches 0.012V, which is the abnormal point.
5. The method for screening abnormal charge and discharge cells in battery test production according to claim 3, wherein: if the number of the abnormal points is set to be 3, stopping testing when the number of the abnormal points reaches 3; the maximum abnormal point number is the data number of the judgment range; if the range is 10, the maximum number of outliers is 10.
6. The method for screening abnormal charge and discharge cells in battery test production according to claim 1, wherein the determination process of the abnormal point in steps S4 and S5 is as follows:
(1) comparing the current sampling voltage with the previous sampling voltage value, and if the current sampling voltage is smaller than the previous sampling voltage value, comparing the current sampling voltage with the reference point;
(2) if the absolute value of the difference value with the reference point is larger than the set error value, the result is abnormal; otherwise, the operation is normal;
(3) if the current reference point value is 3.200V, the previous sampling voltage value is 3.111V, the current sampling voltage value is 3.011V, the 3.011V is less than 3.111V and is judged to be descending, and the absolute value of 3.011V-3.200V is-0.189V, and-0.189V is 0.189V; assuming that the set error value is 0.09V, 0.189 is greater than 0.09, and 3.011 is an abnormal point, wherein the set error value is set according to the actual battery condition.
7. The method for screening abnormal charge and discharge cells in battery test production according to claim 1, characterized in that: in the step S7, counting the number of abnormal points, if the number of abnormal points is 3, and if it is determined that the number of abnormal points reaches 3, stopping the test protection; the number 3 is set according to the actual condition of the battery.
8. The method for screening abnormal charge and discharge cells in battery test production according to claim 5, wherein: carrying out segmentation processing on the judgment range;
(1) voltage segmentation mode:
1) if the voltage is between 1V and 2V, setting the deviation value to be 0.03V and 7 abnormal point data;
2) if the voltage is between 2V and 3V, setting the deviation value to be 0.01V and the number of abnormal point data to be 5;
(2) capacity segmentation mode:
1) if the capacity is 0-1000mAh, setting the deviation value to be 0.03V and 7 abnormal point data;
2) if the voltage is 1000mAh to 2000mAh, the deviation value is set to be 0.01V, and the number of the abnormal point data is 5.
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