Battery capacity estimation method and device

A battery capacity and battery technology, applied in measuring devices, measuring electrical variables, measuring electricity, etc., can solve the problems of high battery capacity estimation cost and low estimation accuracy, so as to improve battery estimation effect, reduce estimation cost, and avoid capacity inconsistency. Effect

Active Publication Date: 2018-01-12
BEIJING ELECTRIC VEHICLE
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] In this way, the cost of estimating the battery capacity is relatively high, and the accuracy of the battery current, voltage, and temperature sampling is relatively dependent, and the estimation accuracy is not high.

Method used

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  • Battery capacity estimation method and device
  • Battery capacity estimation method and device
  • Battery capacity estimation method and device

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Embodiment Construction

[0057] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents coming within the spirit and scope of the appended claims.

[0058] figure 1 is a schematic flowchart of a method for estimating battery capacity proposed by an embodiment of the present invention.

[0059] The embodiment of the present invention can be used to estimate the battery capacity of the lithium-ion power battery.

[0060] see figure 1 , the method includes:

[0061] S101: Obtain the battery response of the battery to ...

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Abstract

The invention provides a battery capacity estimation method and device. The method includes the steps: acquiring response conditions of batteries to be estimated and reference batteries in different states and under preset current pulsed excitation, and building estimation models of actual battery capacity in different environment temperature states according to voltage response sample entropy andcurrent capacity estimation valves of the reference batteries; estimating actual capacity of the batteries to be estimated in the different environment temperature states according to the voltage response sample entropy of the batteries to be estimated and the capacity estimation models. The different states include battery charge and discharge circulation frequency and battery environment temperature. According to the method, the estimation cost of the battery capacity can be effectively reduced, dependence on battery current, battery voltage and temperature sampling accuracy is reduced, themethod solves the technical problem of low estimation accuracy caused by inconsistent battery capacity in the aging circulation process, and the estimation effects of the batteries are improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery capacity estimation method and device. Background technique [0002] In the related technology, the remaining capacity of the battery is calculated according to the charging and discharging current of the battery pack. If the battery pack is in a static state for more than a predetermined time, the open circuit voltage OCV is detected, and the change of the remaining capacity of the battery in each time period is calculated and calculated according to the open circuit voltage. The table calculates the change amount of the remaining battery capacity, calculates the battery capacity attenuation weight value based on the two changes obtained from the above calculation, and calculates the current battery remaining capacity based on the weight value and the remaining battery capacity at the previous moment. [0003] In this way, the cost of estimating the battery capacity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 马淑倩陈卓杨重科韩广璞
Owner BEIJING ELECTRIC VEHICLE
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