Lithium battery battery pack capacity calculation method
A battery pack and lithium battery technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of the entire pack capacity loss, large loss, and reduced cruising range, achieving good application prospects and improving life expectancy
Active Publication Date: 2021-10-15
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology
However, because the battery pack connects many batteries in series and parallel, when it is charging, due to the influence of space and time, different temperatures and voltages will be generated between different series and parallel modules, which will cause a loss to the capacity of the whole pack.
And as the number of cycles increases, the loss of capacity caused by temperature and voltage will become greater and greater, eventually leading to a significant decrease in its cruising range
Method used
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[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.
[0019] Such as figure 1 As shown, the method for calculating the battery pack capacity of the lithium battery described in this embodiment includes the following steps:
[0020] S100. Select x battery packs, where x≥30, and the structure of the battery packs is a series and b parallel, and perform the same charge and discharge test;
[0021] S200. Estimating the capacity loss of the temperature of each battery pack in step S100;
[0022] S300. Estimate the capacity loss of the temperature difference of each battery pack in step S100;
[0023] S40...
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A battery pack capacity calculation method for lithium batteries can be used for accurate calculation of battery pack capacity loss and provide direction for subsequent improvement. The method includes the following steps: S100, select x battery packs, x≥30, the structure of the battery packs is a series and b parallel, and perform the same charge and discharge test; S200, estimate the capacity loss of the temperature of each battery pack in step S100; S300. Estimate the capacity loss of the temperature difference of each battery pack in step S100; S400. Estimate the capacity loss of the pressure difference of each battery pack in step S100; S500. Calculate the temperature, temperature difference and pressure difference of each battery pack above The resulting capacity loss is used to calculate the theoretical capacity of the battery pack. The present invention can quickly find out the influence of temperature and voltage on the capacity through the analysis and calculation of the battery pack electrical performance test data, provides a direction for the subsequent further improvement of the battery pack, and has a good application prospect.
Description
technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a battery pack capacity measurement method for lithium batteries. Background technique [0002] With the large-scale application of lithium batteries, its battery performance has attracted much attention, especially the vigorous promotion of new energy vehicles, which has directly promoted the development of power lithium batteries, which also affects the single performance of lithium batteries, especially the performance of the whole package. Make higher demands. [0003] The package performance of lithium-ion batteries includes a lot of content. In addition to safety performance, its cruising range has attracted the attention of car companies and consumers. The cruising range of the battery pack is mainly limited by the capacity of the single battery, which is also the core of most battery manufacturers' research and development. However, because the battery pack co...
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IPC IPC(8): G01R31/388G01R31/396
CPCG01R31/388G01R31/396
Inventor 吴昊天杨刘倩
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY