A new energy vehicle power distribution method and system

Abstract

The present application discloses a power distribution method and system for a new energy vehicle, which adjusts the output power of a battery system of a new energy vehicle through the variation law of DCR and SOC and the law of SOC and output power value, thereby slowing down the aging of the battery system , improve the service life of new energy vehicles. The method includes: obtaining the DC internal resistance DCR matrix table and the discharge power matrix table of the battery system of the new energy vehicle. The output power under SOC; when the new energy vehicle starts to drive, the current SOC and current temperature of the battery system are detected; according to the current temperature, current SOC, DCR matrix table and discharge power matrix table, the real-time output power value is calculated; The output power value controls the battery system to distribute power to the new energy vehicle.

Description

technical field [0001] The present invention relates to the field of new energy vehicles, in particular to a method and system for power distribution of new energy vehicles. Background technique [0002] At present, the human social environment is seriously damaged, and fossil energy is increasingly depleted. In order to improve the current situation, countries around the world have begun to restrict the manufacture and use of fuel vehicles, and vigorously develop new energy vehicles. In order to produce new energy vehicles with better performance, pure electric vehicles The design of the power battery, the most critical component of new energy vehicles, is particularly critical. [0003] The power distribution of the battery system of the new energy vehicle is a very important task, because it can effectively prevent the abuse of the battery, prolong its service life, and prevent the occurrence of many fault alarms. The current of the battery will accelerate the change of ...

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Problems solved by technology

[0003] The power distribution of the battery system of new energy vehicles is a very important task, because it can effectively prevent the abuse of the battery, prolong its service life, and prevent many fault alarms from occurring. The current of the battery will accelerate the change of lithium ion deintercalation concentration and increase the polarization, thus shortening the battery life. Moreover, with the aging of the vehicle and the battery system, the availability of the battery in different years, different mileage, and different power The power of the battery will be affected, so a reasonable battery management system is very important for the distribution of the available power of the battery

[0004] According to the battery experiment and long-term tracking, it is concluded that the available power of the battery for different stages and different electric quantities is different. For the new factory battery, the power distribution of the battery can be set by direct detection, but the power distribution of the battery can be set in a long-term use Finally, the lithium ion deintercalation concentration inside the lithium battery will change, resulting in an irreversible chemical reaction, and the polarization will increase. Therefore, after a long period of use, theoretically, the power of the vehicle needs to be reduced accordingly. However, in the current battery management system, the discharge In the strategy, there is often no adjustment and restriction on the power used by the vehicle as the degree of use increases, which creates a vicious circle. The longer the use time, the lower the actual available power should be. If used, it will cause faster aging and reduce the service life of new energy vehicles

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