A method for online full inspection of battery positive plate weight

Abstract

The invention provides an on-line and full-inspection method for the weight of a battery positive plate. According to the method, the average value M01 of the actual basis weight of a positive plate corresponding to each volume of the foam nickel is measured and calculated according to the size of the positive plate and the rolling elongation percentage of the foam nickel. The average value M01 ofthe actual basis weight of the positive plate and the weight grading standard of active materials filled in the positive plate are input into a management system. After that, an ID number is marked on each positive plate, and the weight M1 of the single positive plate is weighed. The ID number on the positive plate is read by an instrument. The management system calculates to obtain the weight Mof active materials filled in the positive plate according to a preset formula M=M1-M01. The weight M1 of the positive plate, the weight M of active materials filled in the positive plate, and the IDnumber on the positive plate are stored in the one-to-one correspondence manner. Finally, the management system grades the positive plate according to the input weight grading standard of active materials filled in the positive plate. The method is simple, and positive plates can be graded more accurately. By adopting the method, the capacity consistency of batteries prepared by adopting electrodeplates graded by the present invention is better.

Description

Technical field [0001] The invention relates to a method for detecting the weight of battery pole pieces, in particular to an online full inspection method for the weight of battery positive plates. Background technique [0002] Ni-MH batteries are widely used in many fields, and many fields require batteries to be combined before use. For battery combinations, battery capacity is a key performance indicator. In the prior art, the deviation of battery capacity is basically about 6.5%. However, for high-end applications, especially power vehicles, a larger number of The battery pack forms a power battery pack. In this case, the current battery capacity deviation level cannot meet the requirements of the power battery pack well. Before the power battery pack is combined, the batteries can be combined after multiple selections. Even so At present, the power battery pack still has the problem of large capacity fluctuations, and it will cause the phenomenon of insufficient capacity o...

AI Technical Summary

Problems solved by technology

For the battery combination, the battery capacity is a key performance indicator. In the existing technology, the deviation of the battery capacity is basically about 6.5%. Batteries are combined to form a power battery pack. In this case, the current deviation level of battery capacity cannot meet the requirements of the power battery pack well. At present, the power battery pack still has the problem of large capacity fluctuations, and it will cause the waste of some batteries due to insufficient capacity and excessive capacity of some batteries in the power battery pack due to large capacity deviations between batteries.

[0003] One of the reasons for the large deviation of the current battery capacity is that the weight classification of the positive electrode sheet is not accurate enough. The current method of grading the weight of the positive electrode sheet is generally as follows: (1) the overall weight of the positive electrode sheet (i.e. the weight of the matrix + Filled active material weight) to carry out full inspection or random inspection to detect and classify; (2) adopt random inspection to detect and classify the filled active material weight of the positive electrode sheet, but in this method, the weight of the matrix is ​​usually based on the nickel foam Theoretical areal density and pole piece size are calculated

For those skilled in the art, it is known that the battery capacity is mainly determined by the amount of active material filled in the positive electrode sheet, but the current two methods of grading the positive electrode sheet cannot accurately measure the filling capacity of the positive electrode sheet. The amount of active material, which makes the deviation of the battery capacity is large, which has a great impact on the battery combination in the later stage.

And at present, most of the positive plate classification is manual classification, and some negligence will inevitably occur during the operation process, which will easily cause errors in the classification of the positive electrode, which also causes large deviations in battery capacity, and even the battery capacity is not good enough. One of the reasons for qualifying