Vehicle-mounted battery pack life estimation method
A technology for life estimation and battery packs, which is used in the measurement of electricity, electric vehicles, vehicle energy storage, etc. It can solve the problems of rising costs, excessive design of vehicle battery packs, and waste of use, so as to avoid waste, ensure safe use, Avoid overcharge and overdischarge effects
Active Publication Date: 2018-04-10
CH AUTO TECH CORP CO LTD
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Problems solved by technology
Therefore, if the battery pack is used according to the life of the battery pack obtained in the prior art, the battery cells whose life is shorter than the life of the battery pack are running below the end of their life, which will cause overcharging or over-discharging for the short-lived battery cells security risks
Therefore, in the prior art, in order to solve this problem, in order to ensure the safety of use, enough margin will be reserved during use, which usually causes excessive design of the capacity of the on-board battery pack and premature termination of the use of the battery pack. Cause cost increase and waste of use
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[0032] In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the method for estimating the life of the on-board battery pack proposed according to the present invention, its specific implementation, method, and structure will be described below in conjunction with the accompanying drawings and preferred embodiments. , features and their effects are described in detail below. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
[0033] Such as figure 1 As shown, an embodiment of the present invention proposes a method for estimating the life of an on-board battery pack, which includes:
[0034] 101. Measure the capacitance of each battery cell in the vehicle battery pack.
[0035] Specifically...
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The invention relates to a vehicle-mounted battery pack life estimation method and relates to the technical field of automobile industry. The technical scheme is mainly characterized by measuring electric capacity of each battery monomer in a vehicle-mounted battery pack; measuring current, temperature and voltage of each battery monomer in the vehicle-mounted battery pack during operation; according to the current of each battery monomer and corresponding electric capacity of each battery monomer, calculating discharge rate and state of charge of each battery monomer; according to the state of charge of each battery monomer and the corresponding electric capacity of each battery monomer, calculating depth of discharge of each battery monomer; according to the temperature, depth of discharge and discharge rate of each battery monomer, estimating the service life of each battery monomer through a life model; and selecting the shortest life from all battery monomer lives as the service life of the vehicle-mounted battery pack. The vehicle-mounted battery pack life estimation method can effectively protect the vehicle-mounted battery pack, prevent overcharge and overdischarge of eachbattery monomer and ensure safe operation of the vehicle-mounted battery pack.
Description
technical field [0001] The invention relates to the technical field of the automobile industry, in particular to a method for estimating the life of a vehicle-mounted battery pack. Background technique [0002] For the main driving power source of pure electric vehicles, plug-in electric vehicles and hybrid electric vehicles - battery packs, it is required to have the characteristics of high energy density, long cycle life, low self-discharge rate, no memory effect, etc., and accurate estimation is required The life of the battery pack is to ensure that the battery pack can work stably during use. [0003] In the prior art, the estimation of the service life of the on-board battery pack usually takes the whole battery pack as the research object, conducts charging and discharging experiments on the battery pack, and when the electric capacity of the battery pack decays to 80% of the initial capacity, the battery pack passes The number of charge and discharge times is used a...
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IPC IPC(8): G01R31/36
CPCG01R31/367Y02T10/70
Inventor 陆群张雅琨
Owner CH AUTO TECH CORP CO LTD
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