Method and equipment for detecting state of health of battery

A technology for battery health status and battery, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of complex realization process, very large error of SOH value of battery, tedious estimation process, etc., and achieves simple and reliable detection process. High performance and high accuracy

Active Publication Date: 2013-10-09
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology

[0005] The above method of estimating the state of health of a battery has a certain degree of accuracy for a specific battery, but in many cases the internal resistance of a lithium-ion battery does not change or changes without obvious rules, and the interaction between temperature, current, and batteries during actual use It is more significant, so the error of the SOH value of the battery obtained by this method is very large; at the same time, this method needs to deal with the relationship between internal resistance, SOC, temperature and SOH parameters, so the estimation process is more cumbersome, and the implementation process is relatively Complicated, when the battery is abnormal, it will not be able to give a warning of battery abnormality in time; when the battery is overcharged or overdischarged, the change of SOH cannot be analyzed through internal resistance, but it may give an indication of battery health

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  • Method and equipment for detecting state of health of battery
  • Method and equipment for detecting state of health of battery

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Embodiment Construction

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] During the use of lithium-ion batteries, the battery capacity will gradually decrease, that is, the battery health will gradually deteriorate. The main reason is that the chemical side reactions generated during the use of the battery will consume active lithium ions, and the chemical side reactions will produce Gas, with the reduction of active lithium ions in the lithium-ion battery, more and more gas is generated inside the battery, and the battery shell is deformed by the pressure of the internal gas. Therefore, the internal pressure of the battery gradually increases during the cycle of charging and discharging The SOH of the battery is obtained by testing the internal pressure of the battery; the SOH of the battery is equal to the disc...

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Abstract

The invention provides a method for detecting the state of health of a battery. The method comprises the steps that the internal pressure of the battery is detected; the SOH of the battery is obtained from a corresponding relation generated in advance according to the internal pressure of the battery; the corresponding relation is the corresponding relation between the SOH and the internal pressure of the battery. The invention further provides equipment for detecting the state of health of the battery. According to the technical scheme, the improvement of detection accuracy of the SOH of the battery is achieved.

Description

【Technical field】 [0001] The invention relates to the field of battery detection, in particular to a method and equipment for detecting the health state of a battery. 【Background technique】 [0002] With the maturity of lithium-ion battery technology and the advantages of long cycle life, fast charging and discharging, and good safety performance, lithium-ion batteries are becoming more and more widely used, mainly in the fields of transportation and communication, such as Cars, mobile phones, laptops, etc. [0003] Lithium-ion batteries are used as energy storage units. In actual use, the state of health (SOH) of lithium-ion batteries plays an important role in product maintenance, replacement, and maintenance. Proper application is very important. [0004] The current method of estimating the state of health of the battery is to establish the correspondence between the internal resistance of the battery, the battery state of charge (SOC, State of Charge), temperature, an...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 钟正王兴杰马向民
Owner HUAWEI DIGITAL POWER TECH CO LTD
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