Battery PACK thermal field change evaluation method based on data

Abstract

The invention discloses a battery PACK thermal field change evaluation method based on data, and belongs to the field of automobile batteries. The method specifically comprises the following steps of:collecting temperature data output by a plurality of temperature sensors arranged in a battery PACK through a BMS (Battery Management System), determining a reporting period, and periodically reporting the collected temperature data to a server according to the reporting period; determining the effective interval of the temperature data, screening the temperature data by the server according to the effective interval, and storing the temperature data in the effective interval; determining a data accumulation period, and after the data accumulation period is reached, starting data analysis processing; and determining a data processing period, and carrying out processing analysis on the stored latest temperature data by the server every other data processing period. According to the method,the battery PACK thermal field can be accurately evaluated, the abnormality of the battery PACK can be predicted and identified, and the abnormal condition can be alarmed, so that safety accidents are effectively avoided.

Description

technical field [0001] The invention belongs to the field of automobile batteries, and in particular relates to a data-based evaluation method for thermal field changes of battery packs. Background technique [0002] A power battery is a device that converts chemical energy into electrical energy. The conversion process is a complex physical and chemical reaction process, and the temperature rise in the conversion process directly affects the conversion efficiency and the safety and life of the battery. And currently, [0003] The performance of power batteries is sensitive to temperature changes, especially the large-capacity, high-power lithium-ion batteries used in vehicles. The loading space on the vehicle is limited, and the number of batteries required by the vehicle is relatively large, and the batteries are all closely arranged and connected. When the vehicle is running under different driving conditions such as high speed, low speed, acceleration, deceleration, et...

AI Technical Summary

Problems solved by technology

[0004] Due to the dense arrangement of the heat-generating battery bodies of the power battery PACK, there must be more heat accumulation in the middle area and less in the edge area, which increases the temperature imbalance between the units in the battery pack and makes the internal resistance and capacity of each battery module and monomer inconsistent. sex

If the battery pack of an electric vehicle cannot be dissipated in time at high temperature, the temperature of the battery pack system will be too high or the temperature distribution will be uneven, which will eventually reduce the battery charge and discharge cycle efficiency, affect the power and energy of the battery, and in severe cases will Lead to thermal runaway, affecting the safety and reliability of the battery

Using the battery thermal management system can control the battery PACK temperature to a certain extent, but it still cannot prevent car battery safety accidents caused by thermal fields and other similar reasons

[0005] At present, the problem of battery pack thermal field changes can only be controlled externally by the battery thermal management system, but this is only the thermal management control of the battery pack and cannot predict or identify the abnormality of the battery pack. Problems such as battery thermal runaway lead to a sudden reduction in battery PACK life, and may even cause safety accidents, etc.

Images