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Rapid battery capacity detecting method for lithium ion batteries

A lithium-ion battery and detection method technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of increasing the production cost of lithium-ion batteries, complicated and time-consuming detection process, and long time, so as to improve market application prospects, Significant significance of production practice and the effect of improving detection efficiency

Inactive Publication Date: 2013-02-27
TIANJIN LISHEN BATTERY
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Problems solved by technology

[0006] However, at present, it takes a long time to detect the actual discharge capacity of lithium-ion batteries under specified conditions, generally no less than 11 hours, the detection process is complicated and time-consuming, and because each battery needs to be tested, it takes a lot of time and effort. Labor costs have greatly increased the production cost of lithium-ion batteries, affecting the extensive production and promotion of lithium-ion batteries

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  • Rapid battery capacity detecting method for lithium ion batteries
  • Rapid battery capacity detecting method for lithium ion batteries
  • Rapid battery capacity detecting method for lithium ion batteries

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specific Embodiment

[0053] Select 50 of multiple lithium-ion batteries of the same type (that is, multiple lithium-ion batteries with the same nominal capacity) as sample battery packs, and charge them, such as figure 2 shown, for figure 2 In the graph of the relationship between the battery voltage and the battery charging capacity of a lithium-ion battery in the sample battery pack shown, the 80% SOC of the battery state of charge with a large slope is selected as the cut-off point of constant current charging, and then used for constant current charging. The current size of the current charging is selected as 1105mA (0.5C 2 A, C 2 Indicates the discharge capacity when the battery is discharged to the termination voltage at a discharge rate of 2h), according to the SOC of 80% of the battery state of charge, it can be calculated that the time required for constant current charging can be set to 97 minutes (min).

[0054] Then use the standard detection method to measure the actual discharge ...

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Abstract

The invention discloses a rapid battery capacity detecting method for lithium ion batteries. The rapid battery capacity detecting method includes the steps: firstly, selecting an arbitrary number of batteries among all the batteries as a sample battery pack and then measuring actual discharge capacity of each battery in the sample battery pack; secondly, measuring open-circuit voltage of each battery in the sample battery pack; thirdly, obtaining the corresponding relation between the actual discharge capacity and the open-circuit voltage according to the actual discharge capacity and the open-circuit voltage of each battery in the sample battery pack; fourthly, respectively measuring open-circuit voltage of remaining batteries except for the sample battery pack; and fifthly, obtaining the actual discharge capacity of each remaining battery according to the corresponding relation between the actual discharge capacity and the open-circuit voltage of each battery. The rapid battery capacity detecting method for the lithium ion batteries can efficiently and rapidly detect the actual discharge capacity of a plurality of lithium ion batteries under different conditions, and the efficiency of detecting the lithium ion batteries is greatly improved.

Description

technical field [0001] The invention relates to the technical field of battery detection, in particular to a method for quickly detecting the battery capacity of a lithium-ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high voltage, no pollution, high cycle life, no memory effect, fast charging speed, etc., not only widely used in portable electronic devices such as mobile phones, digital cameras and laptop computers, but also widely It is used in large and medium-sized electric equipment such as electric vehicles, electric bicycles, and electric tools, so the quality requirements for lithium-ion batteries are getting higher and higher. [0003] For lithium-ion batteries, there are many technical indicators for evaluating the quality of lithium-ion batteries, among which battery capacity is one of the very important technical indicators. Battery capacity indicates the amount of electricity discharged by the...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 沈修岗贾学恒孟旭朱玉芹
Owner TIANJIN LISHEN BATTERY
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