Battery pack soh estimation method and system

A technology for battery packs and single cells, which is applied in the direction of measuring electricity, measuring electrical variables, and instruments, and can solve the problems of unfixable initial SOC, large SOH estimation error, and excessive SOH estimation error.

Active Publication Date: 2019-09-17
GAC AION NEW ENERGY AUTOMOBILE CO LTD
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Problems solved by technology

[0007] SOH estimation error is too large
Since the estimation error of SOC itself is generally about 10%, this will directly cause the estimation error of SOH to be too large
At the same time, since the initial SOC of vehicle charging cannot be fixed, the calculation error of SOH estimation is further added

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  • Battery pack soh estimation method and system
  • Battery pack soh estimation method and system
  • Battery pack soh estimation method and system

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Embodiment Construction

[0074] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.

[0075] like figure 1 As shown, in one of the embodiments, a battery pack SOH estimation method is provided, and the battery pack SOH estimation method in this embodiment includes:

[0076] Step S101: When the battery pack is in the charging state, detect the voltage value of the lowest voltage single battery;

[0077] Wherein, the charging state of the battery pack can be judged according to the vehicle control signal and the battery state signal on the CAN bus.

[0078] Step S102: when it is detected that the voltage value has reached the start value of the preset vol...

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Abstract

The present invention relates to a battery pack SOH (state of health) estimation method and system. The method includes the following steps that: when a battery pack is in a charging state, the voltage value of a battery with minimum voltage is detected; temperature values which appear when the voltage value reaches the starting point value and finishing point value of a preset voltage accumulation interval are obtained, the capacity values of the accumulation of the battery pack in the voltage accumulation interval in a current charging process are obtained; and the current SOH value of the battery pack is determined according to the obtained temperature values and capacity values. With the Battery pack SOH (state of health) estimation method and system provided by the embodiments of the invention adopted, the development complexity of SOH estimation can be simplified, and SOH estimation errors can be reduced. The battery pack SOH (state of health) estimation method and system are not affected by factors such as vehicle use environments, working conditions and driving habits, and therefore, the reliability and relative accuracy of SOH estimation can be improved.

Description

technical field [0001] The invention relates to the technical field of vehicle battery management, in particular to a battery pack SOH estimation method and system. Background technique [0002] In recent years, in order to deal with the environmental pollution caused by the rapid development of the automobile industry and the rapid consumption of oil resources, all countries are actively conducting research on new energy vehicles. As the core component of pure electric vehicles (BEV) and plug-in hybrid electric vehicles (PHEV), automotive power batteries have a direct impact on the driving range, service life, and safety performance of the vehicle. A car power battery is a battery pack (also called a battery pack) composed of multiple single cells. The SOH (State of Health, state of health) of the battery pack is an important parameter of the state of the vehicle power battery, which characterizes the output capacity of the battery. The storage capacity of the battery pac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/392
Inventor 曾勇闵文骏王仁蓝郭思超李剑铮郭连杰
Owner GAC AION NEW ENERGY AUTOMOBILE CO LTD
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