CN112649739B - Method and device for determining standing time after battery liquid injection - Google Patents
Method and device for determining standing time after battery liquid injection Download PDFInfo
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- CN112649739B CN112649739B CN202011528436.XA CN202011528436A CN112649739B CN 112649739 B CN112649739 B CN 112649739B CN 202011528436 A CN202011528436 A CN 202011528436A CN 112649739 B CN112649739 B CN 112649739B
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Abstract
The invention discloses a method and a device for determining standing time after battery liquid injection, wherein the method comprises the steps of obtaining a cell parameter of a cell to be tested based on a preset time rule, and determining voltage stabilization time of the cell to be tested based on the cell parameter; judging whether the electrolyte infiltration area of the pole piece of the battery cell to be tested meets a preset area rule or not based on a preset time rule to obtain an infiltration result; determining undetermined standing time after the liquid injection of the first preset number of electric cores to be tested based on the voltage stabilization time and the infiltration result; performing performance test on the to-be-tested battery cell with different standing time lengths to obtain a performance test result; and determining the optimal standing time from the first preset number of pending standing times based on the performance test result. The application realizes the technical effects of determining the accurate standing time of different battery cells, reducing the storage time of the battery cells, reducing the space utilization rate, improving the production efficiency and reducing the manufacturing cost.
Description
Technical Field
The embodiment of the invention relates to the technical field of batteries, in particular to a method and a device for determining standing time after battery liquid injection.
Background
The battery needs to be kept stand after liquid injection, but the battery has uncertain standing time after liquid injection in the prior art and has the following defects: the standing time of the battery after liquid injection is too short, the electrolyte is not fully soaked, the ion transmission path becomes far, the shuttle of lithium ions between a positive electrode and a negative electrode is hindered, the pole piece which is not contacted with the electrolyte cannot participate in the electrochemical reaction of the battery, the performance of the battery is influenced, the capacity and the performance cannot meet the production requirements, and the waste of personnel and resources is caused; the battery is too long in standing time and storage time after liquid injection, a large amount of space is needed for storing the battery cores, space waste is caused, and production efficiency is affected.
Disclosure of Invention
The invention provides a method and a device for determining standing time after battery liquid injection, which solve the technical problems of overlong storage time of a battery core, high space occupancy rate and influence on production efficiency caused by uncertain standing time of a battery after liquid injection in the prior art.
The embodiment of the invention provides a method for determining standing time after battery liquid injection, which comprises the following steps:
acquiring a cell parameter of a cell to be tested based on a preset time rule, and determining the voltage stabilization time of the cell to be tested based on the cell parameter;
judging whether the electrolyte infiltration area of the pole piece of the battery cell to be tested meets a preset area rule or not based on the preset time rule to obtain an infiltration result;
determining undetermined standing time after the liquid injection of a first preset number of the electric cores to be tested based on the voltage stabilization time and the infiltration result;
performing performance test on the battery cell to be tested with different standing time to obtain a performance test result;
and determining the optimal standing time from the first preset number of the standing times to be determined based on the performance test result.
Further, the acquiring of the cell parameter of the to-be-detected cell based on the preset time rule, and the determining of the voltage stabilization time of the to-be-detected cell based on the cell parameter include:
measuring the cell parameters every hour within the first 10 hours, and measuring the cell parameters every two hours within 10-36 hours;
drawing a voltage change curve graph of the battery cell to be measured based on the battery cell parameters obtained through measurement;
and determining the voltage stabilization time of the battery cell to be tested based on the voltage change curve graph.
Further, the judging whether the electrolyte infiltration area of the pole piece of the battery cell to be tested meets the preset area rule based on the preset time rule includes:
disassembling the electric core to be tested once every hour within the first 10 hours, disassembling the electric core to be tested once every two hours within 10-36 hours, and measuring the electrolyte infiltration area of the pole piece of the disassembled electric core to be tested;
calculating the ratio of the electrolyte infiltration area to the whole area of the pole piece of the battery cell to be tested to obtain a calculation result;
and comparing the calculation result with a preset infiltration area ratio interval, wherein if the calculation result falls into the preset infiltration area ratio interval, the infiltration result is that the infiltration condition of the battery cell to be tested is good.
Further, the determining the undetermined standing time after the liquid injection of the first preset number of the electric cores to be tested based on the voltage stabilization time and the infiltration result includes:
and selecting the voltage stabilization time as the standing time when the voltage fluctuation amplitude of the to-be-detected battery cell does not exceed 0.1V, and selecting the standing time in which the soaking result is good in the soaking condition of the to-be-detected battery cell in the voltage stabilization time as the to-be-determined standing time.
Further, the performance test of the to-be-tested electric core with different standing time lengths includes:
carrying out electrolyte retention evaluation, discharge capacity comparison, first effect data comparison, self-discharge level comparison and full performance test on the battery cell to be tested with different standing time lengths;
and obtaining the performance test result based on the electrolyte retention evaluation result, the discharge capacity comparison result, the first effect data comparison result, the self-discharge level comparison result and the full performance test result.
Further, the electrolyte retention evaluation of the to-be-tested electric core with different standing time periods includes:
measuring the quality of the electric core to be measured before and after liquid injection;
calculating the liquid loss of the electrolyte according to the mass of the battery cell to be tested before and after liquid injection;
determining the electrolyte reserve of the battery cell to be tested based on the liquid loss of the electrolyte;
and comparing the electrolyte reserve of the battery cell to be tested with a preset reserve to obtain an electrolyte reserve evaluation result.
The embodiment of the invention also provides a device for determining the standing time after battery liquid injection, which comprises:
the first determining unit is used for acquiring the cell parameters of the cell to be tested based on a preset time rule and determining the voltage stabilization time of the cell to be tested based on the cell parameters;
the judging unit is used for judging whether the electrolyte infiltration area of the pole piece of the battery cell to be tested meets a preset area rule or not based on the preset time rule to obtain an infiltration result;
the second determining unit is used for determining the to-be-determined standing time after the liquid injection of the first preset number of the electric cores to be tested based on the voltage stabilization time and the infiltration result;
the test unit is used for carrying out performance test on the to-be-tested electric core with different standing time lengths to obtain a performance test result;
and the third determining unit is used for determining the optimal standing time from the first preset number of the standing times to be determined based on the performance test result.
Further, the first determination unit includes:
the first measurement subunit is used for measuring the cell parameters once per hour within the first 10 hours and measuring the cell parameters once per two hours within 10-36 hours;
the drawing subunit is used for drawing a voltage change curve graph of the to-be-measured battery cell based on the measured battery cell parameters;
a first determining subunit, configured to determine the voltage stabilization time of the to-be-measured electric core based on the voltage variation graph.
Further, the judging unit includes:
the second measuring subunit is used for disassembling the electric core to be measured once per hour within the first 10 hours, disassembling the electric core to be measured once per two hours within 10-36 hours, and measuring the electrolyte infiltration area of the pole piece of the disassembled electric core to be measured;
the calculating subunit is used for calculating the ratio of the electrolyte infiltration area to the overall area of the pole piece of the battery cell to be measured to obtain a calculation result;
and the judging subunit is configured to compare the calculation result with a preset infiltration area ratio interval, and if the calculation result falls into the preset infiltration area ratio interval, the infiltration result is that the infiltration condition of the to-be-detected battery cell is good.
Further, the second determining unit is specifically configured to:
and selecting the voltage stabilization time as the standing time when the voltage fluctuation amplitude of the to-be-detected battery cell does not exceed 0.1V, and selecting the standing time when the soaking result is that the soaking condition of the to-be-detected battery cell is good in the voltage stabilization time as the to-be-determined standing time.
The invention discloses a method and a device for determining standing time after battery liquid injection, wherein the method comprises the steps of obtaining a cell parameter of a cell to be tested based on a preset time rule, and determining voltage stabilization time of the cell to be tested based on the cell parameter; judging whether the electrolyte infiltration area of the pole piece of the battery cell to be tested meets a preset area rule or not based on a preset time rule to obtain an infiltration result; determining undetermined standing time after the liquid injection of the first preset number of electric cores to be tested based on the voltage stabilization time and the infiltration result; performing performance test on the to-be-tested battery cell with different standing time lengths to obtain a performance test result; and determining the optimal standing time from the first preset number of pending standing times based on the performance test result. The battery filling device solves the technical problems that in the prior art, the storage time of the battery core is too long due to the uncertain standing time of the battery after liquid injection, the space occupancy rate is high, and the production efficiency is influenced, realizes the accurate standing time of different battery cores, reduces the storage time of the battery core, reduces the space utilization rate, improves the production efficiency, and reduces the manufacturing cost.
Drawings
Fig. 1 is a flowchart of a method for determining a standing time after battery electrolyte injection according to an embodiment of the present invention;
fig. 2 is a flowchart of another method for determining standing time after battery charging according to an embodiment of the present invention;
FIG. 3 is a flow chart of still another method for determining the standing time after battery charging according to an embodiment of the present invention;
FIG. 4 is a flow chart of still another method for determining the standing time after battery charging according to an embodiment of the present invention;
FIG. 5 is a flow chart of still another method for determining the standing time after battery charging according to an embodiment of the present invention;
fig. 6 is a flowchart of still another method for determining the standing time after battery charging according to an embodiment of the present invention;
fig. 7 is a structural diagram of a device for determining a standing time after battery charging according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the drawings are used for distinguishing different objects, and are not used for limiting a specific order. The following embodiments of the present invention may be implemented individually, or in combination with each other, and the embodiments of the present invention are not limited in this respect.
Fig. 1 is a flowchart of a method for determining a standing time after battery charging according to an embodiment of the present invention.
As shown in fig. 1, the method for determining the standing time after battery electrolyte injection specifically includes the following steps:
step S101, obtaining a cell parameter of the cell to be tested based on a preset time rule, and determining the voltage stabilization time of the cell to be tested based on the cell parameter.
Specifically, the cell parameters of the to-be-tested cell can be measured by using the voltage internal resistance tester based on the preset time rule, the cell parameters include the internal resistance value and the voltage value of the to-be-tested cell, and the internal resistance range of the selected voltage internal resistance tester needs to be accurate to 10 -5 Omega, voltage range needs to be accurate to 10 -5 And V, determining the voltage stabilization time of the battery cell to be measured according to the measured battery cell parameters.
Step S102, judging whether the electrolyte infiltration area of the pole piece of the battery cell to be tested meets a preset area rule or not based on a preset time rule, and obtaining an infiltration result.
Specifically, if the area of the dry material area is small in the material area of the pole piece of the to-be-detected cell, it indicates that the electrolyte wettability of the pole piece of the to-be-detected cell is good, so that the wetting effect of the to-be-detected cell can be judged based on the area of the dry material area of the pole piece of the to-be-detected cell; disassembling the battery cell to be tested based on a preset time rule, then judging whether the electrolyte infiltration area of the pole piece of the battery cell to be tested meets the preset area rule, if so, indicating that the infiltration area of the pole piece of the battery cell to be tested is good, and determining the time to be determined to be the standing time when the battery cell to be tested is in standing.
Step S103, determining undetermined standing time after the liquid injection of the first preset number of electric cores to be tested based on the voltage stabilization time and the infiltration result.
Specifically, the undetermined standing time after the liquid injection of the plurality of (i.e., the first preset number) electric cores to be tested is determined according to the standing time (i.e., the voltage stabilization time) during which the voltage of the electric cores to be tested after the liquid injection tends to be stable and the standing time (i.e., the soaking result) during which the soaking area of the pole piece is good.
And step S104, performing performance test on the battery cell to be tested with different standing time lengths to obtain a performance test result.
Specifically, after the first preset number of undetermined standing times are determined, picking out the to-be-tested battery cores with the standing time being different from the undetermined standing times, and respectively performing various performance tests on the to-be-tested battery cores to detect whether various performances of the to-be-tested battery cores meet the factory standards and obtain performance test results.
And step S105, determining the optimal standing time from the first preset number of undetermined standing times based on the performance test result.
Specifically, a battery cell to be tested meeting the factory standard is selected according to a performance test result obtained through testing, and the undetermined standing time corresponding to the selected battery cell to be tested is determined as the optimal standing time, so that in the subsequent production process of the battery cell to be tested, the battery cell after liquid injection only needs to be stood by using the determined optimal standing time, and a high-quality battery meeting the factory standard can be obtained.
The battery filling device solves the technical problems that in the prior art, the storage time of the battery core is too long due to the uncertain standing time of the battery after liquid injection, the space occupancy rate is high, and the production efficiency is influenced, realizes the accurate standing time of different battery cores, reduces the storage time of the battery core, reduces the space utilization rate, improves the production efficiency, and reduces the manufacturing cost.
Based on the above technical solution, in this embodiment, the cell parameter of the to-be-detected cell is obtained based on the preset time rule in the above embodiment, and the voltage stabilization time of the to-be-detected cell is determined based on the cell parameter to perform optimization. Fig. 2 is a flowchart of another method for determining standing time after battery electrolyte injection according to an embodiment of the present invention, and as shown in fig. 2, the method for determining standing time after battery electrolyte injection according to the embodiment includes the following steps:
step S201, measuring the electric core parameter once per hour in the first 10 hours, and measuring the electric core parameter once per two hours in 10-36 hours.
Specifically, the voltage of the battery cell after liquid injection changes rapidly in the first several hours and gradually becomes stable in the later hours, so that the voltage of the battery cell after liquid injection can be measured once every hour within the first 10 hours and can be measured once every two hours within 10-36 hours, and the measured battery cell parameters include the voltage value and the internal resistance value of the battery cell to be measured.
Step S202, drawing a voltage change curve chart of the battery cell to be measured based on the measured battery cell parameters.
Step S203, determining the voltage stabilization time of the to-be-measured electric core based on the voltage variation graph.
After the cell parameters of the cell to be measured are obtained through measurement, a voltage change curve graph of the cell to be measured is drawn based on the cell parameters, the voltage region stabilization time of the cell to be measured, namely the voltage stabilization time, is found according to the voltage change curve graph of the cell to be measured, and the voltage stabilization time is used as one of the conditions for determining the standing time of the cell to be measured.
Step S204, judging whether the electrolyte infiltration area of the pole piece of the battery cell to be tested meets a preset area rule or not based on a preset time rule, and obtaining an infiltration result.
Step S205, determining the undetermined standing time after the liquid injection of the first preset number of electric cores to be tested based on the voltage stabilization time and the infiltration result.
Step S206, the battery cell to be tested with the standing time of different undetermined standing times is subjected to performance testing, and a performance testing result is obtained.
Step S207, determining the optimal standing time from the first preset number of undetermined standing times based on the performance test result.
The battery filling device solves the technical problems that in the prior art, the storage time of the battery core is too long due to the uncertain standing time of the battery after liquid injection, the space occupancy rate is high, and the production efficiency is influenced, realizes the accurate standing time of different battery cores, reduces the storage time of the battery core, reduces the space utilization rate, improves the production efficiency, and reduces the manufacturing cost.
Based on the above technical scheme, this embodiment determines, based on the preset time rule, whether the electrolyte infiltration area of the pole piece of the to-be-tested battery cell meets the preset area rule, and optimizes the obtained infiltration result. Fig. 3 is a flowchart of another method for determining standing time after battery electrolyte injection according to an embodiment of the present invention, and as shown in fig. 3, the method for determining standing time after battery electrolyte injection according to the embodiment includes the following steps:
step S301, obtaining the cell parameters of the cell to be tested based on the preset time rule, and determining the voltage stabilization time of the cell to be tested based on the cell parameters.
Step S302, the cell to be tested is disassembled once per hour within the first 10 hours, the cell to be tested is disassembled once per two hours within 10-36 hours, and the electrolyte infiltration area of the pole piece of the disassembled cell to be tested is measured.
Specifically, the electrolyte infiltration area of the pole piece of the to-be-measured electric core can be measured according to a preset time rule which is the same as the measurement of the electric core parameter of the to-be-measured electric core, that is, the to-be-measured electric core is disassembled once every hour within the first 10 hours, then the electrolyte infiltration area of the pole piece of the to-be-measured electric core is measured, and the electrolyte infiltration area of the pole piece of the to-be-measured electric core is measured every two hours within 10 to 36 hours.
Step S303, calculating the ratio of the non-electrolyte infiltration area to the whole area of the pole piece of the battery cell to be measured to obtain a calculation result.
Specifically, after the electrolyte infiltration area of the pole piece is obtained through measurement, the electrolyte infiltration area is subtracted from the whole area of the pole piece of the battery cell to be tested, and the obtained difference is compared with the whole area of the pole piece of the battery cell to be tested to obtain a calculation result.
Step S304, comparing the calculation result with the preset infiltration area ratio interval, and if the calculation result falls into the preset infiltration area ratio interval, determining that the infiltration condition of the battery cell to be measured is good.
Specifically, after the ratio of the non-electrolyte infiltration area to the overall area of the pole piece of the to-be-measured electric core is obtained, the ratio is compared with the preset infiltration area ratio interval, for example, the preset infiltration area ratio interval may be set to [5%,15% ], that is, if the calculation result is less than or equal to 15% and greater than or equal to 5%, the infiltration result is that the infiltration condition of the to-be-measured electric core is good.
Step S305, determining undetermined standing time after the liquid injection of the first preset number of electric cores to be tested based on the voltage stabilization time and the infiltration result.
Step S306, carrying out performance test on the battery cell to be tested with different standing time lengths to obtain a performance test result.
Step S307, determining the optimal standing time from the first preset number of undetermined standing times based on the performance test result.
The battery filling device solves the technical problems that in the prior art, the storage time of the battery cell is too long due to uncertain standing time of the battery after liquid injection, the space occupancy rate is high, and the production efficiency is influenced, realizes that the accurate standing time of different battery cells can be determined, reduces the storage time of the battery cell, reduces the space utilization rate, improves the production efficiency, and reduces the technical effect of manufacturing cost.
Based on the above technical solution, this embodiment optimizes the undetermined standing time after the liquid injection of the first preset number of electric cores to be tested is determined based on the voltage stabilization time and the infiltration result in the above embodiment. Fig. 4 is a flowchart of another method for determining standing time after battery electrolyte injection according to an embodiment of the present invention, and as shown in fig. 4, the method for determining standing time after battery electrolyte injection according to the embodiment includes the following steps:
step S401, obtaining the cell parameters of the cell to be tested based on the preset time rule, and determining the voltage stabilization time of the cell to be tested based on the cell parameters.
Step S402, the cell to be tested is disassembled once per hour within the first 10 hours, the cell to be tested is disassembled once per two hours within 10-36 hours, and the electrolyte infiltration area of the pole piece of the disassembled cell to be tested is measured.
Step S403, calculating a ratio of the non-electrolyte infiltration area to the overall area of the pole piece of the to-be-measured battery cell, and obtaining a calculation result.
Step S404, comparing the calculation result with the preset infiltration area ratio interval, and if the calculation result falls into the preset infiltration area ratio interval, determining that the infiltration condition of the battery cell to be tested is good.
Step S405, selecting the standing time when the voltage stabilization time is the voltage fluctuation amplitude of the to-be-detected battery cell not more than 0.1V, and selecting the standing time when the soaking result is the good soaking condition of the to-be-detected battery cell in the voltage stabilization time as the to-be-determined standing time.
Specifically, after the voltage stabilization time and the infiltration result are determined, the standing time with good infiltration result within the standing time range with the voltage stabilization time not exceeding 0.1V above and below the voltage fluctuation amplitude is selected as the undetermined standing time, that is, the voltage stabilization time with the voltage fluctuation amplitude not exceeding 0.1V above and below and the standing time with good infiltration result are selected as the undetermined standing time.
Step S406, performing performance test on the battery cell to be tested with the standing time of different undetermined standing times to obtain a performance test result.
Step S407, determining the optimal standing time from the first preset number of undetermined standing times based on the performance test result.
The battery filling device solves the technical problems that in the prior art, the storage time of the battery core is too long due to the uncertain standing time of the battery after liquid injection, the space occupancy rate is high, and the production efficiency is influenced, realizes the accurate standing time of different battery cores, reduces the storage time of the battery core, reduces the space utilization rate, improves the production efficiency, and reduces the manufacturing cost.
Based on the above technical scheme, in this embodiment, the performance test is performed on the to-be-tested battery cell with the standing time being different to-be-determined standing times in the above embodiment, and a performance test result is obtained to optimize. Fig. 5 is a flowchart of another method for determining standing time after battery electrolyte injection according to an embodiment of the present invention, and as shown in fig. 5, the method for determining standing time after battery electrolyte injection according to the embodiment includes the following steps:
step S501, obtaining the cell parameters of the cell to be tested based on the preset time rule, and determining the voltage stabilization time of the cell to be tested based on the cell parameters.
Step S502, judging whether the electrolyte infiltration area of the pole piece of the battery cell to be tested meets a preset area rule or not based on a preset time rule, and obtaining an infiltration result.
Step S503, determining the undetermined standing time after the liquid injection of the first preset number of electric cores to be tested based on the voltage stabilization time and the infiltration result.
Step S504, electrolyte retention evaluation, discharge capacity comparison, first-effect data comparison, self-discharge level comparison and full performance test are carried out on the battery cell to be tested with different standing time lengths.
Specifically, after the first preset number of times to be set to rest is determined, the performance of the to-be-tested battery cores corresponding to different times to be set to rest needs to be tested, and whether the to-be-tested battery cores meet the factory standards of the battery is determined.
Optionally, the electrolyte retention evaluation of the to-be-tested electric core with the standing time being different undetermined standing times includes: measuring the quality of the battery cell to be measured before and after liquid injection; calculating the liquid loss of the electrolyte according to the mass of the to-be-detected battery cell before and after liquid injection; determining the electrolyte reserve of the battery cell to be tested based on the liquid loss of the electrolyte; and comparing the electrolyte reserve of the battery cell to be tested with the preset reserve to obtain an electrolyte reserve evaluation result.
Specifically, after the undetermined standing time is determined, firstly, the cell mass of the to-be-measured cell before and after liquid injection is weighed; then calculating the liquid loss of the electrolyte, and subtracting the mass of the electric core after liquid injection from the mass of the electric core before liquid injection and then subtracting the mass of an air bag in the electric core before liquid injection to obtain the liquid loss of the electrolyte; and finally, subtracting the liquid loss of the electrolyte from the total amount of the electrolyte to obtain the electrolyte retention of the to-be-tested battery cell, then evaluating the electrolyte retention, and determining which battery cell to be tested in the undetermined standing time has the best electrolyte retention to obtain the final electrolyte retention evaluation result.
It should be noted that, the mass of the battery cell to be measured is weighed, and the adopted horizontal balance needs to be accurate to 10 -5 g, can so that to weigh more accurately, and to the electric core that awaits measuring, electrolyte hold amount is more, and the infiltration nature is better, and the time of stewing after the corresponding notes liquid is more suitable.
Optionally, the comparing of the discharge capacities of the to-be-tested battery cells with different undetermined standing times includes: dividing the capacity of the battery cell to be tested after standing is completed, and acquiring the discharge capacity of each battery cell to be tested after capacity division; and transversely comparing the discharge capacities of the battery cells to be tested to determine the optimal discharge capacity, and obtaining a discharge capacity comparison result.
Specifically, after the undetermined standing time is determined, grading the capacity of the battery cores to be tested with different undetermined standing times after standing is completed, wherein grading refers to battery capacity sorting, and is simply understood that the capacity of a batch of produced batteries is definitely different; and after the capacity grading is finished, measuring the discharge capacity of each cell to be tested after the capacity grading is finished, then transversely comparing the discharge capacities of different cells to be tested, determining the optimal discharge capacity, and obtaining the final discharge capacity comparison result.
Optionally, the comparing the first-effect data of the to-be-tested electric core with the different undetermined standing times includes: grading the static battery cell to be tested, and acquiring the first discharge capacity and the first charge capacity of each battery cell to be tested after grading; and comparing the first discharge capacity with the first charge capacity to obtain first effect data, and transversely comparing the first effect data of each battery cell to be tested to obtain a first effect data comparison result.
Specifically, after the undetermined standing time is determined, the capacity grading is carried out on the to-be-detected battery cores of different undetermined standing times after the undetermined standing time is determined, after the capacity grading is completed, the first discharge capacity and the first charge capacity of each to-be-detected battery core are measured, then the first discharge capacity and the first charge capacity are compared, the first effect data of the to-be-detected battery cores are obtained, then the first effect data of the different to-be-detected battery cores are transversely compared, and a first effect data comparison result is obtained.
Optionally, the comparing the self-discharge levels of the to-be-tested battery cells with different undetermined standing times includes: aging the battery cell to be tested after the standing is finished, and measuring the self-discharge level of each battery cell to be tested after the aging treatment is finished; and transversely comparing the self-discharge levels of the cells to be tested to obtain a self-discharge level comparison result.
Specifically, after the undetermined standing time is determined, the self-discharge levels of the electric cores to be tested need to be compared, the electric cores to be tested after standing are aged firstly, then the self-discharge levels of the electric cores to be tested after aging are measured, finally the self-discharge levels of all the electric cores to be tested are transversely compared, the self-discharge level of which electric core to be tested is more in line with the self-discharge requirement of the battery under the capacity, and a final self-discharge level comparison result is obtained.
Optionally, the full performance test on the electric core to be tested with the different undetermined standing times includes: and testing the electrical property, the storage property and the safety property of the battery cell to be tested after standing is completed, wherein the obtained test result is a full-performance test result.
Specifically, after the undetermined standing time is determined, a full performance test needs to be performed on the electric core to be tested, specifically including testing electrical performance, storage performance and safety performance, wherein the electrical performance test includes performance tests such as double charging, double discharging and circulation of the electric core to be tested, so as to verify that the performance of the electric core to be tested is optimal in the undetermined standing time, and obtain a final full performance test result.
And step S505, obtaining a performance test result based on the electrolyte retention evaluation result, the discharge capacity comparison result, the first effect data comparison result, the self-discharge level comparison result and the full performance test result.
Specifically, when the battery cell to be tested is subjected to the performance tests, the performance test results are obtained, and then the performance test results are integrated to obtain the final performance test result, so that the optimal standing time is determined.
Step S506, determining the optimal standing time from the first preset number of undetermined standing times based on the performance test result.
The battery filling device solves the technical problems that in the prior art, the storage time of the battery cell is too long due to uncertain standing time of the battery after liquid injection, the space occupancy rate is high, and the production efficiency is influenced, realizes that the accurate standing time of different battery cells can be determined, reduces the storage time of the battery cell, reduces the space utilization rate, improves the production efficiency, and reduces the technical effect of manufacturing cost.
The following describes a method for determining a standing time after battery electrolyte injection provided by the present application with a specific example. Fig. 6 is a flowchart of still another method for determining a standing time after battery charging according to an embodiment of the present invention. As shown in fig. 6, the method for determining the standing time after battery liquid injection provided by this embodiment includes the following steps:
step S601, measuring the cell parameters once per hour in the first 10 hours, measuring the cell parameters once every two hours in 10-36 hours, disassembling the cell to be tested once per hour in the first 10 hours, disassembling the cell to be tested once every two hours in 10-36 hours, and measuring the electrolyte infiltration area of the pole piece of the disassembled cell to be tested.
Step S602, drawing a voltage change curve chart of the battery cell to be measured based on the measured battery cell parameters.
Step S603, determining the voltage stabilization time of the to-be-measured battery cell based on the voltage change curve.
Step S604, calculating the ratio of the non-electrolyte infiltration area to the whole area of the pole piece of the battery cell to be tested, and obtaining a calculation result.
Step S605, comparing the calculation result with the preset infiltration area ratio interval, and if the calculation result falls into the preset infiltration area ratio interval, determining that the infiltration condition of the battery cell to be tested is good.
Step S606, selecting the standing time when the voltage stabilization time is the voltage fluctuation amplitude of the to-be-detected battery cell not more than 0.1V, and selecting the standing time when the soaking result is that the soaking condition of the to-be-detected battery cell is good in the voltage stabilization time as the to-be-determined standing time.
Step S607, electrolyte retention evaluation, discharge capacity comparison, first-effect data comparison, self-discharge level comparison and full performance test are carried out on the battery cell to be tested with different standing time lengths.
Step S608, a performance test result is obtained based on the electrolyte retention amount evaluation result, the discharge capacity comparison result, the first effect data comparison result, the self-discharge level comparison result, and the full performance test result.
Step S609, determining the optimal standing time from the first preset number of pending standing times based on the performance test result.
The method for determining the standing time after the liquid injection of the battery can test the voltage and the internal resistance of the battery cell by adopting a gradient experiment under the condition that a battery system is unknown, judge the relation between a dry material area of a positive electrode and the wettability of a pole piece by means of disassembling the battery cell and finally obtain the standing time after the liquid injection (namely the undetermined standing time) required by the battery of the system; and then, verifying the optimal standing time of the system battery by performing various performance tests such as liquid retention capacity, discharge capacity, first-effect data, full performance test and the like on the battery core.
The method provided by the application is simple to operate, the optimal standing time after the lithium ion battery is injected with the liquid can be rapidly determined, then the range of the standing time after the battery is injected with the liquid is obtained, and finally the optimal standing time is determined from the range of the standing time according to the performance of the battery.
The embodiment of the present invention further provides a device for determining standing time after battery liquid injection, where the device for determining standing time after battery liquid injection is used to execute the method for determining standing time after battery liquid injection provided in the above embodiment of the present invention, and the device for determining standing time after battery liquid injection provided in the embodiment of the present invention is specifically described below.
Fig. 7 is a structural diagram of a device for determining a standing time after battery charging according to an embodiment of the present invention, and as shown in fig. 7, the device for determining a standing time after battery charging mainly includes: a first determining unit 71, a judging unit 72, a second determining unit 73, a testing unit 74, a third determining unit 75, wherein:
the first determining unit 71 is configured to obtain a cell parameter of the to-be-detected cell based on a preset time rule, and determine a voltage stabilization time of the to-be-detected cell based on the cell parameter;
the judging unit 72 is configured to judge whether the electrolyte infiltration area of the pole piece of the battery cell to be tested meets a preset area rule based on a preset time rule, so as to obtain an infiltration result;
the second determining unit 73 is configured to determine to-be-determined standing time after the liquid injection of the first preset number of to-be-detected battery cores based on the voltage stabilization time and the infiltration result;
the test unit 74 is used for performing performance test on the to-be-tested electric core with different standing time lengths to obtain a performance test result;
a third determining unit 75, configured to determine an optimal resting time from the first preset number of pending resting times based on the performance test result.
Optionally, the first determining unit 71 includes:
the first measurement subunit is used for measuring the cell parameters once per hour within the first 10 hours and measuring the cell parameters once per two hours within 10-36 hours;
the drawing subunit is used for drawing a voltage change curve chart of the battery cell to be measured based on the measured battery cell parameters;
and the first determining subunit is used for determining the voltage stabilization time of the battery cell to be tested based on the voltage change curve graph.
Alternatively, the judging unit 72 includes:
the second measuring subunit is used for disassembling the electric core to be measured once per hour within the first 10 hours, disassembling the electric core to be measured once per two hours within 10-36 hours, and measuring the electrolyte infiltration area of the pole piece of the disassembled electric core to be measured;
the calculating subunit is used for calculating the ratio of the non-electrolyte infiltration area to the whole area of the pole piece of the battery cell to be measured to obtain a calculation result;
and the judging subunit is used for comparing the calculation result with the preset infiltration area ratio interval, and if the calculation result falls into the preset infiltration area ratio interval, the infiltration result is that the infiltration condition of the to-be-detected battery cell is good.
Optionally, the second determining unit 73 is specifically configured to:
and selecting the standing time when the voltage stabilization time is not more than 0.1V above and below the voltage fluctuation amplitude of the to-be-detected battery cell, and selecting the standing time when the soaking result is good in the soaking condition of the to-be-detected battery cell in the voltage stabilization time as the undetermined standing time.
Optionally, the test unit 74 comprises:
the test subunit is used for carrying out electrolyte retention evaluation, discharge capacity comparison, first-effect data comparison, self-discharge level comparison and full performance test on the battery cell to be tested with different standing time lengths;
and the determining subunit is used for obtaining a performance test result based on the electrolyte holding capacity evaluation result, the discharge capacity comparison result, the first effect data comparison result, the self-discharge level comparison result and the full performance test result.
Optionally, the test subunit is specifically configured to:
measuring the quality of the battery cell to be measured before and after liquid injection;
calculating the liquid loss of the electrolyte according to the mass of the to-be-detected battery cell before and after liquid injection;
determining the electrolyte reserve of the battery cell to be tested based on the liquid loss of the electrolyte;
and comparing the electrolyte reserve of the battery cell to be tested with the preset reserve to obtain an electrolyte reserve evaluation result.
Optionally, the test subunit is further configured to: dividing the capacity of the battery cell to be tested after standing is completed, and acquiring the discharge capacity of each battery cell to be tested after capacity division; and transversely comparing the discharge capacity of each battery cell to be tested, determining the optimal discharge capacity, and obtaining a discharge capacity comparison result.
Optionally, the test subunit is further configured to: grading the capacity of the battery cell to be tested after standing is completed, and acquiring the first discharge capacity and the first charge capacity of each battery cell to be tested after grading; and comparing the first discharge capacity with the first charge capacity to obtain first effect data, and transversely comparing the first effect data of each battery cell to be tested to obtain a first effect data comparison result.
Optionally, the test subunit is further configured to: aging the standing battery cells to be tested, and measuring the self-discharge level of each battery cell to be tested after aging; and transversely comparing the self-discharge levels of the battery cells to be tested to obtain a self-discharge level comparison result.
Optionally, the test subunit is further configured to: and testing the electrical property, the storage property and the safety property of the battery cell to be tested after standing is finished, wherein the obtained test result is a full-performance test result.
The device provided by the embodiment of the present invention has the same implementation principle and technical effect as the method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the method embodiments without reference to the device embodiments.
The method for determining the standing time after battery liquid injection provided by the embodiment of the invention has the same technical characteristics as the device for determining the standing time after battery liquid injection provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for determining standing time after battery liquid injection is characterized by comprising the following steps:
acquiring a cell parameter of a cell to be tested based on a preset time rule, and determining the voltage stabilization time of the cell to be tested based on the cell parameter;
judging whether the electrolyte infiltration area of the pole piece of the battery cell to be tested meets a preset area rule or not based on the preset time rule to obtain an infiltration result;
determining undetermined standing time after the liquid injection of a first preset number of the electric cores to be tested based on the voltage stabilization time and the infiltration result;
performing performance test on the battery cell to be tested with different standing time to obtain a performance test result;
and determining the optimal standing time from the first preset number of the standing times to be determined based on the performance test result.
2. The method of claim 1, wherein the obtaining of the cell parameter of the to-be-tested cell based on the preset time rule, and the determining of the voltage stabilization time of the to-be-tested cell based on the cell parameter comprise:
measuring the cell parameters every hour within the first 10 hours, and measuring the cell parameters every two hours within 10-36 hours;
drawing a voltage change curve graph of the battery cell to be measured based on the battery cell parameters obtained through measurement;
and determining the voltage stabilization time of the battery cell to be tested based on the voltage change curve graph.
3. The method according to claim 1, wherein the determining whether the electrolyte infiltration area of the pole piece of the electrical core to be tested satisfies a preset area rule based on the preset time rule, and obtaining an infiltration result comprises:
disassembling the electric core to be tested once every hour within the first 10 hours, disassembling the electric core to be tested once every two hours within 10-36 hours, and measuring the electrolyte infiltration area of the pole piece of the disassembled electric core to be tested;
calculating the ratio of the infiltration area of the electrolyte to the whole area of the pole piece of the battery cell to be tested to obtain a calculation result;
and comparing the calculation result with a preset infiltration area ratio interval, wherein if the calculation result falls into the preset infiltration area ratio interval, the infiltration result is that the infiltration condition of the battery cell to be tested is good.
4. The method of claim 3, wherein the determining the to-be-determined rest time after the injection of the first preset number of the cells to be tested based on the voltage stabilization time and the infiltration result comprises:
and selecting the voltage stabilization time as the standing time when the voltage fluctuation amplitude of the to-be-detected battery cell does not exceed 0.1V, and selecting the standing time in which the soaking result is good in the soaking condition of the to-be-detected battery cell in the voltage stabilization time as the to-be-determined standing time.
5. The method of claim 1, wherein the performing the performance test on the to-be-tested electric core with the different undetermined standing time periods to obtain the performance test result comprises:
carrying out electrolyte retention evaluation, discharge capacity comparison, first effect data comparison, self-discharge level comparison and full performance test on the battery cell to be tested with different standing time lengths;
and obtaining the performance test result based on the electrolyte retention evaluation result, the discharge capacity comparison result, the first effect data comparison result, the self-discharge level comparison result and the full performance test result.
6. The method of claim 5, wherein the evaluating the electrolyte retention of the to-be-tested battery cell with the different pending resting time periods comprises:
measuring the quality of the electric core to be measured before and after liquid injection;
calculating the liquid loss of the electrolyte according to the mass of the battery cell to be tested before and after liquid injection;
determining the electrolyte reserve of the battery cell to be tested based on the liquid loss of the electrolyte;
and comparing the electrolyte reserve of the battery cell to be tested with a preset reserve to obtain an electrolyte reserve evaluation result.
7. A device for determining the standing time after battery liquid injection, which is characterized by comprising:
the first determining unit is used for acquiring the cell parameters of the cell to be tested based on a preset time rule and determining the voltage stabilization time of the cell to be tested based on the cell parameters;
the judging unit is used for judging whether the electrolyte infiltration area of the pole piece of the battery cell to be tested meets a preset area rule or not based on the preset time rule to obtain an infiltration result;
a second determining unit, configured to determine to-be-determined standing time after liquid injection of a first preset number of the electric cores to be tested based on the voltage stabilization time and the infiltration result;
the test unit is used for carrying out performance test on the to-be-tested electric core with different standing time lengths to obtain a performance test result;
and the third determining unit is used for determining the optimal standing time from the first preset number of the standing times to be determined based on the performance test result.
8. The apparatus according to claim 7, wherein the first determining unit comprises:
the first measurement subunit is used for measuring the cell parameters once per hour within the first 10 hours and measuring the cell parameters once per two hours within 10-36 hours;
the drawing subunit is used for drawing a voltage change curve graph of the to-be-measured battery cell based on the measured battery cell parameters;
and the first determining subunit is configured to determine the voltage stabilization time of the to-be-measured battery cell based on the voltage change curve graph.
9. The apparatus according to claim 7, wherein the judging unit includes:
the second measuring subunit is used for disassembling the electric core to be measured once per hour within the first 10 hours, disassembling the electric core to be measured once per two hours within 10-36 hours, and measuring the electrolyte infiltration area of the pole piece of the disassembled electric core to be measured;
the calculating subunit is used for calculating the ratio of the electrolyte infiltration area to the overall area of the pole piece of the battery cell to be measured to obtain a calculation result;
and the judging subunit is configured to compare the calculation result with a preset infiltration area ratio interval, and if the calculation result falls into the preset infiltration area ratio interval, the infiltration result is that the infiltration condition of the to-be-detected battery cell is good.
10. The apparatus according to claim 7, wherein the second determining unit is specifically configured to:
and selecting the voltage stabilization time as the standing time when the voltage fluctuation amplitude of the to-be-detected battery cell does not exceed 0.1V, and selecting the standing time in which the soaking result is good in the soaking condition of the to-be-detected battery cell in the voltage stabilization time as the to-be-determined standing time.
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| CN114267894B (en) * | 2021-12-23 | 2022-11-01 | 郑州中科新兴产业技术研究院 | Method for judging aging time of lithium ion battery |
| CN115856658B (en) * | 2022-12-13 | 2024-04-19 | 蜂巢能源科技(马鞍山)有限公司 | Battery soaking time detection method and device, electronic equipment and storage medium |
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