Calculation method of battery pack actual capacity

A technology of actual capacity and calculation method, which is applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., to achieve the effect of easy implementation, simple calculation, and accurate calculation

Inactive Publication Date: 2013-05-15
HUIZHOU EPOWER ELECTRONICS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the shortcomings of the existing battery SOH estimation, the present invention provides a design scheme for the calculation method of the actual capacity of the battery pack

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  • Calculation method of battery pack actual capacity

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Embodiment Construction

[0013] In order to allow those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

[0014] Such as figure 1 As shown, the present invention discloses a method for calculating the actual capacity of a battery pack. First, get the SOC value SOC1 when the battery pack just enters the working state as the initial value, and get the SOC value SOC2 when the battery pack stops working for a period of time (usually several hours) after charging or enters the working state for the second time as the end value , and then calculate the discharge capacity ΔQ of the detection battery pack in the time period between the two states of SOC1 and SOC2.

[0015] According to the calculation formula of SOC: SOC=remaining power of the battery pack / actual capacity of the battery pack, we can get:

[0016] SOC1-SOC2 = remaining battery power Q1 / actual battery ...

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Abstract

The invention discloses a calculation method of a battery pack actual capacity. The calculation method includes the following steps: (1) acquiring the value of the stress optical coefficient (SOC) SOC1 as an initial value when the battery pack just enters a working state. (2) acquiring the value of the stress optical coefficient (SOC) SOC2 as an end value when the battery pack stops working for a long time or enters the working state for the second time.(3) calculating the discharge capacity delta Qin the time quantum between SOC1and SOC 2. (4) calculating the actual capacity of the battery pack= delta Q / (SOC1-SOC2). If delta Q is less than a preset threshold value, then the currently detected data is deleted and the detection is carried out again. The preset threshold value is regulated according to the size of the different battery pack capacity. The calculation method of the battery pack actual capacity has the advantages that the calculation is simple; the realization of the calculation is simple, the actual capacity of the battery pack can be exactly calculated. The initial value and the end value of the calculation all chooses the value of the battery pack after standing so that the calculation can be exact and the calculation value is more close to the true value.

Description

technical field [0001] The invention relates to a method for calculating the actual capacity of a battery pack. Background technique [0002] At present, many electric vehicle companies require the battery management system to add SOH (battery state of health) function, the purpose is to facilitate the driver to measure the health information and life of the battery. The basis of SOH estimation is to accurately calculate the actual capacity of the battery pack at this time according to the command demand. According to the actual capacity of the battery pack, the SOH value of the battery system at this time can be obtained by looking up the table. The two-dimensional table corresponding to the actual capacity of the battery pack and the SOH value has been embedded in the battery management system, and this table is provided by the battery manufacturer. Obviously, the actual capacity of the battery pack needs to be calculated to complete the estimation of the SOH value. At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 刘飞文锋阮旭松黄隆庚
Owner HUIZHOU EPOWER ELECTRONICS
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