Electric car power battery SOH measuring and calculating method

A technology for power batteries and electric vehicles. It is applied in the direction of measuring electricity, measuring devices, and measuring electrical variables. It can solve problems such as high cost, time-consuming and laborious, and difficult electrochemical models, so as to eliminate influence, simple calculation algorithm, and accurate test results. reliable effect
CN106291378AActive Publication Date: 2017-01-04HIGER
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HIGER
Publication Date
2017-01-04

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Abstract

The invention discloses an electric car power battery SOH measuring and calculating method. Firstly, every single cell is charged fully, and the temperature of the cell is recorded. An ampere hour integral method is used to calculate the accumulated power consumption of every single cell of a current day, and an instant average temperature is obtained through weighted calculation according to the power consumption until the temperature and OCV of every single cell are stable, and then the temperature and OCV of every single cell at the moment are recorded. For each cell, an OCV table is used to search for a corresponding SOC, then a corresponding SOCS at 25 DEG C is obtained, a full charge temperature is used to search for a corresponding SOCF at 25 DEG C of the cell in the table, the power consumption is converted to corresponding power consumption at 25 DEG C, the capacity CSOH of each cell is calculated, and an initial rated capacity C0 is used to calculate SOH = CSOH / C0 for each cell. The method utilizes the stable corresponding relationship between the temperature, OCV and SOC to measure and calculate the SOH of each cell. The test results are accurate and reliable and do not need offline measurement.
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Description

technical field

[0001] The invention relates to power battery technology, in particular to a method for measuring and calculating the SOH of a power battery of an electric vehicle. Background technique

[0002] The power battery pack of electric vehicles, with the increase of use time, the running mileage becomes larger, the number of charge and discharge cycles increases, and the capacity and performance of the battery will gradually degrade. This degree of degradation is measured by an indicator, which is the State of Health of the battery, referred to as SOH. Calculating the SOH can know the various performance changes of the whole battery pack, as well as the degree of differentiation of the battery cells. When a single cell is seriously aging, it can be warned in time to maintain the battery pack and replace the battery cells.

[0003] At present, three methods are commonly used to measure SOH. The first method is to take the battery offline and test various parameters...

Claims

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