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A lithium ion battery discharge process voltage inconsistency estimation method and device

A lithium-ion battery, battery discharge technology, applied in the direction of computing, electrical digital data processing, special data processing applications, etc., can solve the lack of battery inconsistency, affect the detection accuracy of battery packs and working condition control, battery monitoring dead angle and other problems , to achieve the effect of reducing sampling cost and test cycle, realizing efficient prediction, and avoiding monitoring dead ends

Active Publication Date: 2019-05-24
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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AI Technical Summary

Problems solved by technology

The problem of battery inconsistency caused by the production process can be alleviated to a certain extent by screening methods, but there is still a lack of comprehensive understanding of the problem of battery inconsistency after grouping
This will affect the long-term detection accuracy and working condition control of the battery pack, making individual batteries become monitoring dead spots in the battery pack, unable to work under normal working conditions, causing accelerated aging or safety issues

Method used

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  • A lithium ion battery discharge process voltage inconsistency estimation method and device
  • A lithium ion battery discharge process voltage inconsistency estimation method and device
  • A lithium ion battery discharge process voltage inconsistency estimation method and device

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Embodiment Construction

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0051] figure 1 A flow chart of a method for estimating voltage inconsistency during a discharge process of a lithium-ion battery provided by an embodiment of the present invention is shown. like figure 1 As shown, the lithium-ion battery discharge process voltage inconsistency estimation method provided in this embodiment includes:

[0052] St...

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Abstract

The invention provides a method and a device for estimating voltage inconsistency in a discharging process of lithium ion batteries. The method comprises the following steps of: obtaining a probability distribution cloud picture of battery discharging voltage changing along with capacity before battery grouping; solving a first-order derivative and a second-order derivative about voltage relativeto capacity for the probability distribution cloud picture; and according to the first-order derivative and the second-order derivative, obtaining a change rule of discreteness and symmetry of voltagedistribution of the single batteries along with a discharge process. The method not only can estimate the voltage discreteness change process, but also can estimate the voltage symmetry change process, an estimation result can effectively guide establishment of a battery pack state estimation algorithm, it is guaranteed that each single battery in the battery pack is within a monitoring range, and monitoring dead angles are avoided. According to the method, the first derivative and the second derivative of the voltage relative to the capacity are obtained by adopting a numerical derivation method, and the voltage discreteness and symmetry are directly obtained, so that a complex statistical method is effectively replaced, and high-efficiency prediction of discharge voltage inconsistency is realized.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method and a device for estimating voltage inconsistency in the discharge process of lithium ion batteries. Background technique [0002] In order to meet the needs of high-energy and high-power vehicles, lithium-ion batteries need to be connected in series and parallel to be used in vehicles. However, due to the difference in performance between the single cells, the performance of the battery pack is lower than that of the single cell, which will not only affect the detection accuracy of the BMS, but also shorten the life of the battery pack or cause safety problems. The problem of inconsistency after single cells are grouped is inevitable and will only increase with the cycle process. The most important manifestation of inconsistency between cells in the battery pack is the inconsistency of voltage and capacity, which will directly affect the accuracy of the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02E60/10
Inventor 王琳舒卢世刚赵挺方彦彦云凤玲
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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