Life Estimation Method of Vehicle Battery Pack

A technology for life estimation and battery packs, applied in battery/fuel cell control devices, measuring electricity, electric vehicles, etc., can solve the problems of rising cost, waste of use, and excessive design of vehicle battery pack capacity, to avoid waste, avoid Overcharge and overdischarge, the effect of ensuring safe use

Active Publication Date: 2021-01-26
CH AUTO TECH CORP CO LTD
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  • Abstract
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  • Claims
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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

Method used

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  • Life Estimation Method of Vehicle Battery Pack
  • Life Estimation Method of Vehicle Battery Pack
  • Life Estimation Method of Vehicle Battery Pack

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Embodiment Construction

[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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Abstract

The invention relates to a method for estimating the life of a vehicle-mounted battery pack, and relates to the technical field of the automobile industry. The main technical solutions are: measuring the capacitance of each battery cell in the on-board battery pack; measuring the current, temperature and voltage of each battery cell during the operation of the on-board battery pack; according to the current of each battery cell and the corresponding batteries Calculate the discharge rate and state of charge of each battery cell based on the capacitance of the battery cell; calculate the discharge depth of each battery cell according to the state of charge of each battery cell and the corresponding capacitance of each battery cell; According to the temperature, depth of discharge and discharge rate of each battery cell, the service life model estimates the life of each battery cell; select the shortest life from all battery cells as the life of the on-board battery pack. Using this method to estimate the life of the on-board battery pack can effectively protect the on-board battery pack, avoid overcharging and over-discharging of the battery cells, and ensure the safe operation of the on-board 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/392G01R31/367G01R31/396B60L58/16
CPCG01R31/367Y02T10/70
Inventor 陆群张雅琨
Owner CH AUTO TECH CORP CO LTD
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