Battery cycle life test method and device

Abstract

The invention discloses a battery cycle life testing method and a device, which belong to the technical field of vehicle product testing. The method comprises the following steps: constructing a bench testing environment for a battery, the temperature of the bench testing environment being higher than the room temperature; obtaining a proportional relationship between the number of cycles and the number of charging and discharging tests in road tests under the bench testing environment; performing the bench tests on the first cycle times according to the cycle condition until the total discharged power amount reaches the first target energy wherein the first target energy is the total energy consumed by the driving of a first target kilometer of a vehicle in the road tests; according to the proportional relationship and the first cycle times, obtaining the number of charging and discharging times required for driving the first target kilometer in the road tests; and obtaining the cycle life of the battery by the number of charging and discharging times required for the vehicle to drive the first target kilometer in the road tests. The invention predicts the cycle life of the battery through the bench testing data without the need of actual road tests, thus overcoming the shortcomings that the current vehicle testing time is long, the environment is uncontrollable and the testing cost is high.

Description

technical field [0001] The invention relates to the technical field of vehicle product testing, in particular to a battery cycle life testing method and device. Background technique [0002] The cycle life refers to the number of cycles that the battery can withstand before the battery capacity drops to a specified value under a certain charge and discharge system (one charge and one discharge is called a cycle). The battery cycle life is a parameter that electric vehicles need to focus on. Before purchasing an electric vehicle, users generally need to know the battery cycle life of the electric vehicle. In order to meet user needs and ensure the quality of electric vehicles, car manufacturers usually spend a long time Time to put electric cars to the test. [0003] At present, the cycle life of electric vehicle batteries is generally tested by road tests of different kilometers such as 20,000-kilometer road test, 25,000-kilometer road test, and 100,000-kilometer road test....

AI Technical Summary

Problems solved by technology

[0005] The above technology requires testers to actually drive electric vehicles, which consumes a lot of manpower, and the test environment is a natural environment, which is uncontrollable. The charging and discharging process of the battery system takes a long time, resulting in a long test cycle and high test costs.

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