A lithium ion battery peak power testing method

By using the peak current pass value under high SOC state to estimate the peak current test value under low SOC state in lithium-ion battery testing, and combining the battery terminal voltage and pulse duration, the current is dynamically adjusted to accurately predict the peak power, solving the problems of low testing efficiency and insufficient accuracy in existing technologies, and realizing efficient and stable peak power testing.

CN122362166APending Publication Date: 2026-07-10GUANGDONG AUTOMOTIVE TEST CENT CO LTD
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Patent Information

Application Number
CN202610830861.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-10
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing peak power testing methods for lithium-ion batteries are inefficient, rely on experience and complex models, are time-consuming and inaccurate, and repeated trial and error lead to battery aging and strong data dependence.

Method used

By obtaining the qualified peak current value of lithium-ion batteries under high SOC conditions, the peak current test value under low SOC conditions is calculated. Combined with the battery terminal voltage and pulse duration, the current is dynamically adjusted to accurately predict the peak power, reducing the number of iterations and using physical characteristic feedback to replace experience and complex models.

Benefits of technology

It significantly shortens test time, improves test accuracy and versatility, and is suitable for new, aged, or incomplete data batteries, reducing battery aging and achieving efficient and stable peak power testing.

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Abstract

This invention relates to the field of lithium-ion battery testing technology, and specifically to a method for testing the peak power of lithium-ion batteries. Based on the qualified peak current value of the lithium-ion battery under a first state of charge, a peak current test value under a second state of charge is determined. Based on the peak current test value, a current pulse test of a preset time is performed on the lithium-ion battery under test to determine the battery terminal voltage and the actual pulse duration at the end of the test. It is then determined whether the battery terminal voltage falls within the qualified voltage range and whether the actual pulse duration reaches the preset time. If both are yes, the peak current test value is determined to be the qualified peak current value under the second state of charge. If either is no, a new peak current test value is determined based on the battery terminal voltage, the actual pulse duration, and the peak current test value, and the above steps are repeated until the peak power is determined. This invention constructs an efficient and stable automated method for testing battery peak power.
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