System and method for estimating surplus capacity of lithium ion battery

A lithium-ion battery and remaining capacity technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as battery overcharge, overdischarge, customer complaints, etc., and achieve the effect of reducing estimation errors

Inactive Publication Date: 2014-12-10
奇瑞新能源汽车股份有限公司
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  • Description
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  • Application Information

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Problems solved by technology

If the SOC calculation error is too large, it will lead to the following problems: lead to battery overcharging and over-discharging; cruising range calculation error will expand, and customers will complain; reduce the utilization efficiency of electric vehicles and the service life of battery packs

Method used

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  • System and method for estimating surplus capacity of lithium ion battery
  • System and method for estimating surplus capacity of lithium ion battery
  • System and method for estimating surplus capacity of lithium ion battery

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Embodiment Construction

[0011] Below, referring to the accompanying drawings, through the description of the embodiments, the specific implementation of the present invention, such as the control system involved, the mutual connection relationship, and the implementation method, are further described in detail, so as to help those skilled in the art understand the present invention Have a more complete, accurate and in-depth understanding of the inventive concepts and technical solutions.

[0012] Various real-time online SOC estimation methods of battery packs currently used have defects and cannot meet the requirements of actual use. This is mainly because the SOC of the battery pack is related to many factors (such as temperature, charging and discharging state at the previous moment, polarization effect, battery life, etc.), and has a strong nonlinearity, which brings great difficulties to the real-time online estimation of SOC. difficulty. In order to improve the accuracy of SOC real-time onlin...

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Abstract

The invention relates to a system and a method for estimating surplus capacity of a lithium ion battery. The system comprises a SOC (State-of-Charge) prediction module, an ampere-hour integration module, a full-charge and low-charge compensation module, an aging compensation module, a self discharge compensation module, an open-circuit voltage compensation module, a consistency compensation module, and a charging and discharging compensation module. The SOC prediction module regards a voltage U, a current I and a temperature T as input, a basic battery surplus capacity SOC1 is calculated according to the ampere-hour integration module and an initial SOC value. According to compensation values of the full charge compensation module, the aging compensation module, the self discharge compensation module, the open-circuit voltage compensation module, the consistency compensation module and the charging and discharging compensation module, the final battery surplus capacity is calculated. The invention provides a practical, effective and reliable method for estimating the usable surplus capacity for the lithium ion power battery. And by the aid of the method, effectiveness and service life of the battery are improved, and after-sale maintenance period of a power battery pack is lowered.

Description

technical field [0001] The invention belongs to the technical field of pure electric vehicle power battery systems, and relates to a method for estimating the remaining capacity of a power lithium-ion battery. Background technique [0002] With the development of social economy, the demand for energy is further increased, and the voice of new energy technology is getting higher and higher. At present, in the automotive industry, the further development of pure electric vehicle and hybrid vehicle technology has solved part of the energy problem. The power battery pack is used as The main energy storage device of the battery pack is loaded on the electric vehicle. As the power source of the pure electric vehicle, the operating performance of the battery directly affects the operating efficiency of the vehicle. [0003] Battery management technology is through real-time detection and estimation of battery status, temperature, current, DC internal resistance, polarization voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 许莉
Owner 奇瑞新能源汽车股份有限公司
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