CN211603489U - Online measuring device for health state of lithium ion battery - Google Patents
Online measuring device for health state of lithium ion battery Download PDFInfo
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- CN211603489U CN211603489U CN201922316277.6U CN201922316277U CN211603489U CN 211603489 U CN211603489 U CN 211603489U CN 201922316277 U CN201922316277 U CN 201922316277U CN 211603489 U CN211603489 U CN 211603489U
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Abstract
The utility model discloses an online measuring device for the health state of a lithium ion battery, which comprises an MCU control and analysis module and a lithium ion battery monomer voltage acquisition circuit, a current acquisition circuit and a temperature acquisition circuit which are electrically connected with the MCU control and analysis module; the single voltage acquisition circuit comprises a single voltage signal filter circuit, a single voltage signal isolation acquisition circuit and a digital signal SPI transmission circuit which are electrically connected together in sequence. The utility model discloses an online measuring device of lithium ion battery health status and online measuring method, through the charging process of control lithium ion battery, gather lithium ion battery voltage, electric current and the temperature data in the charging process, and combine the voltage, electric current and the temperature data and the historical data of the lithium ion battery who gathers in the course of working, with the internal resistance that adds actual capacity correction method analysis calculation lithium ion battery when weighing ann and the situation of change of capacity, can be real-time online measurement lithium ion battery's SOH.
Description
Technical Field
The utility model belongs to the lithium ion battery field, in particular to online measuring device of lithium ion battery health status in this field.
Background
With the rapid development of the lithium ion battery industry in China, the lithium ion battery is applied to the fields of new energy automobiles, new energy storage and the like on a large scale. The capacity of the lithium ion battery is continuously attenuated, the internal resistance is continuously increased, and the state of health (SOH) of the lithium ion battery is continuously reduced due to the self characteristics and the application environment of the lithium ion battery. The reduction of SOH will bring about the continuous reduction of the electrical performance and safety performance of the lithium ion battery, and may cause safety accidents seriously. In order to avoid the safety problem of the lithium ion battery in the application process and facilitate the echelon utilization of the lithium ion battery, the SOH of the lithium ion battery needs to be measured, and corresponding treatment is carried out according to the SOH value and relevant regulations.
Definition of SOH: under given conditions, the ratio of the dischargeable capacity of the lithium ion battery to the rated capacity of the lithium ion battery is determined. Because the capacity of the lithium ion battery has a certain relation with the internal resistance, the SOH of the lithium ion battery can be indirectly measured through the internal resistance of the lithium ion battery. The current SOH measurement methods mainly include: discharge experiment, internal resistance analysis and statistical rules.
The discharge experiment method is to discharge the lithium ion battery by using equipment until the battery voltage reaches the discharge cut-off voltage, measure the discharge capacity of the lithium ion battery, and calculate the ratio of the discharge capacity to the rated capacity of the lithium ion battery to be the current SOH.
The internal resistance analysis method is to use internal resistance measuring equipment to measure the internal resistance of the lithium ion battery and indirectly measure the SOH of the lithium ion battery by using the relation between the internal resistance of the lithium ion battery and the capacity of the lithium ion battery.
The statistical rule method estimates the SOH of the lithium ion battery by means of mathematical statistics based on the accumulated data of the lithium ion battery in the application process.
The discharge experiment method needs large-scale charge and discharge equipment to measure, is not suitable for application in vehicle-mounted environments and the like, needs deep discharge of the lithium ion battery, influences of the behavior of the measurement on the service life of the lithium ion battery can be caused, influences of the measurement in the whole life cycle on the service life of the lithium ion battery are larger, and the cost is higher.
The internal resistance analysis method comprises the steps of measuring impedance spectrum curves at different stages of the battery cycle life, obtaining a battery equivalent circuit model form according to the impedance spectrum curves, analyzing cycle times and the influence rule of resistance parameters in the equivalent circuit model, finally providing a fitting formula of parameters in the equivalent circuit model changing along with the battery cycle times, and establishing a corresponding relation between characteristic quantity values and the battery health state for service life prediction. The impedance spectrum can give a more refined description of the battery impedance, and can be used for estimating the life characteristics of the battery; however, the measurement is complex, a special measuring instrument is needed, and the EIS technology is applied to the online monitoring of the battery state, and the research on the online rapid measurement technology of the EIS impedance spectrum is needed.
And (4) a statistical rule method for describing the battery performance from the perspective of test data so as to analyze SOH. The method is based on the collected data, and the implicit information in the data is mined for prediction by various data analysis and learning methods, so that the complexity of model acquisition is avoided, and the method is a practical prediction method. However, the data obtained usually has strong uncertainty and imperfection, and it is not practical to test all the possible life influencing factors in practical application. Therefore, the statistical rule method is easy to implement, but has certain limitations.
Disclosure of Invention
The utility model aims to solve the technical problem that an online measuring device of lithium ion battery health status is provided.
The utility model adopts the following technical scheme:
the improvement of an online measuring device for the health state of a lithium ion battery is that: the device comprises an MCU control and analysis module, and a lithium ion battery monomer voltage acquisition circuit, a current acquisition circuit and a temperature acquisition circuit which are electrically connected with the MCU control and analysis module; the single voltage acquisition circuit comprises a single voltage signal filter circuit, a single voltage signal isolation acquisition circuit and a digital signal SPI transmission circuit which are electrically connected together in sequence; the current acquisition circuit comprises a current signal filtering processing circuit, a current signal isolation acquisition circuit and a digital signal SPI transmission circuit which are electrically connected together in sequence; the temperature acquisition circuit comprises a temperature signal filtering processing circuit, a temperature measurement power supply circuit and a temperature signal acquisition circuit which are electrically connected together in sequence.
An on-line measuring method, using the above-mentioned on-line measuring device, its improvement lies in: by controlling the charging process of the lithium ion battery, collecting voltage, current and temperature data of the lithium ion battery in the charging process, analyzing and calculating the internal resistance and capacity change condition of the lithium ion battery by a weighted ampere-hour and actual capacity correction method by combining the collected voltage, current and temperature data and historical data of the lithium ion battery in the working process, measuring the SOH of the lithium ion battery on line in real time, wherein the SOH refers to the ratio of the dischargeable capacity of the lithium ion battery to the rated capacity of the lithium ion battery,
wherein C is0To be the rated capacity of the lithium ion battery, Ct is the current capacity of the lithium ion battery, so the measurement of SOH can be converted into the measurement of the current capacity Ct of the lithium ion battery by the following method:
measuring the current capacity C of the lithium ion battery by adopting a weighted ampere-hour and actual capacity correction methodtCurrent discharge capacity CtdThe weighted integral formula is as follows:
wherein, i (t) is the current discharge current, kappa is the temperature correction coefficient, eta is the discharge depth correction coefficient, and gamma is the discharge multiplying factor correction coefficient;
according to the SOC values SOC (t0) and SOC (td) at the time t0 and td, the current capacity Ct of the lithium ion battery can be calculated, and the formula is as follows:
in summary, the measurement formula of SOH is as follows:
the utility model has the advantages that:
the utility model discloses an online measuring device of lithium ion battery health status and online measuring method, through the charging process of control lithium ion battery, gather lithium ion battery voltage, electric current and the temperature data in the charging process, and combine the voltage, electric current and the temperature data and the historical data of the lithium ion battery who gathers in the course of working, with the internal resistance that adds actual capacity correction method analysis calculation lithium ion battery when weighing ann and the situation of change of capacity, can be real-time online measurement lithium ion battery's SOH. The method can be applied to various types of lithium ion batteries by a parameter calibration method. Compared with a charge-discharge experimental method, the vehicle-mounted/airborne application can be realized, and the application range is greatly improved. Compared with an internal resistance method, a statistical law method and the like, the method has the advantage of high precision. The realization cost is low, and the method has wide market prospect and popularization value.
Drawings
Fig. 1 is a circuit block diagram of an on-line measuring device disclosed in embodiment 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Embodiment 1, as shown in fig. 1, this embodiment discloses an online measurement device for health status of a lithium ion battery, which includes an MCU control and analysis module, and a single voltage acquisition circuit, a current acquisition circuit and a temperature acquisition circuit of the lithium ion battery electrically connected to the MCU control and analysis module; the single voltage acquisition circuit comprises a single voltage signal filter circuit, a single voltage signal isolation acquisition circuit and a digital signal SPI transmission circuit which are electrically connected together in sequence; the current acquisition circuit comprises a current signal filtering processing circuit, a current signal isolation acquisition circuit and a digital signal SPI transmission circuit which are electrically connected together in sequence; the temperature acquisition circuit comprises a temperature signal filtering processing circuit, a temperature measurement power supply circuit and a temperature signal acquisition circuit which are electrically connected together in sequence.
An online measuring method, using the online measuring device, collecting voltage, current and temperature data of a lithium ion battery in the charging process by controlling the charging process of the lithium ion battery, analyzing and calculating the internal resistance and capacity change condition of the lithium ion battery by a weighted ampere-hour and actual capacity correction method by combining the collected voltage, current and temperature data and historical data of the lithium ion battery in the working process, measuring the SOH of the lithium ion battery in real time and online, wherein the SOH refers to the ratio of the dischargeable capacity of the lithium ion battery to the rated capacity of the lithium ion battery,
wherein C is0To be the rated capacity of the lithium ion battery, Ct is the current capacity of the lithium ion battery, so the measurement of SOH can be converted into the measurement of the current capacity Ct of the lithium ion battery by the following method:
measuring the current capacity C of the lithium ion battery by adopting a weighted ampere-hour and actual capacity correction methodtCurrent discharge capacity CtdThe weighted integral formula is as follows:
wherein, i (t) is the current discharge current, kappa is the temperature correction coefficient, eta is the discharge depth correction coefficient, and gamma is the discharge multiplying factor correction coefficient;
according to the SOC values SOC (t0) and SOC (td) at the time t0 and td, the current capacity Ct of the lithium ion battery can be calculated, and the formula is as follows:
in summary, the measurement formula of SOH is as follows:
Claims (1)
1. the utility model provides an online measuring device of lithium ion battery health status which characterized in that: the device comprises an MCU control and analysis module, and a lithium ion battery monomer voltage acquisition circuit, a current acquisition circuit and a temperature acquisition circuit which are electrically connected with the MCU control and analysis module; the single voltage acquisition circuit comprises a single voltage signal filter circuit, a single voltage signal isolation acquisition circuit and a digital signal SPI transmission circuit which are electrically connected together in sequence; the current acquisition circuit comprises a current signal filtering processing circuit, a current signal isolation acquisition circuit and a digital signal SPI transmission circuit which are electrically connected together in sequence; the temperature acquisition circuit comprises a temperature signal filtering processing circuit, a temperature measurement power supply circuit and a temperature signal acquisition circuit which are electrically connected together in sequence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922316277.6U CN211603489U (en) | 2019-12-21 | 2019-12-21 | Online measuring device for health state of lithium ion battery |
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| CN201922316277.6U CN211603489U (en) | 2019-12-21 | 2019-12-21 | Online measuring device for health state of lithium ion battery |
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| CN211603489U true CN211603489U (en) | 2020-09-29 |
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| CN201922316277.6U Active CN211603489U (en) | 2019-12-21 | 2019-12-21 | Online measuring device for health state of lithium ion battery |
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