Grouping method for power lithium ion batteries

Abstract

The invention discloses a grouping method for power lithium ion batteries. The method includes subjecting power lithium ion secondary batteries to one-time charging and discharging detection, rejecting part of the batteries with high derivation according to the ratio of constant current charging capacity/total charging capacity; rejecting the batteries with unqualified capacity according to discharging capacity and grading the capacity; detecting battery internal resistance and grading the batteries according to the difference of the battery internal resistance; shelving the batteries for a period of time under high temperature environment, rejecting the batteries with unqualified voltage, and grading the batteries according to shelved voltage; and finally grouping the batteries in the same grading. For a battery pack of series-parallel grouped application, internal resistance of the batteries of a parallel battery block and volume for each battery block in series are ensured to be uniform. By the grouping method, reliability and service life of the battery pack are guaranteed effectively.

Description

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AI Technical Summary

Benefits of technology

This patented technology allows for better control over how much energy can be used during redox processes within an electrochemical cell (cell). By measuring its charge or discharge capacities separately from other components inside it, we aim to ensure they work properly together without causing any issues. Additionally, this helps us predict future behavior when different materials may have similar properties. Overall, these improvements improve the overall efficiency and lifespan of electricity storing devices while improving their reliability and security feature.

Problems solved by technology

Layered Li ion batteries have certain technical problem addressed in this patents: they require different combinations of materials like cathode material, anodes material, separator plugs, current collectors, and others to achieve their desired properties. However, these solutions may be incomplete due to factors including poor self-dislodgment behavior caused by external influences from environmental conditions, manufacturing variations, and operating environments. Therefore, there remains a challenge in accurately selecting suitable components for each type of battery being tested while also ensuring compatibility across various aspects of its own design.

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