Power cell internal resistance calculation method, and health degree determination method and device

A technology of power battery and calculation method, applied in measuring device, measuring resistance/reactance/impedance, measuring electricity, etc., can solve the problem of low accuracy, large difference between internal resistance value and actual value, large difference between SOH and actual value, etc. problem, to achieve the effect of accurate health and high accuracy

Inactive Publication Date: 2017-05-24
BEIJING BORGWARD AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, a technical problem to be solved by the present invention is to overcome the defects that the internal resistance value of the power battery calculated in the prior art is quite different from the actual value and the accuracy is low; another technical problem to be solved by the present invention is to overcome In the prior art, the calculated SOH of the power battery is quite different from the actual value, and the accuracy is low

Method used

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  • Power cell internal resistance calculation method, and health degree determination method and device
  • Power cell internal resistance calculation method, and health degree determination method and device
  • Power cell internal resistance calculation method, and health degree determination method and device

Examples

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Embodiment 1

[0032] An embodiment of the present invention provides a method for calculating the internal resistance of an offline power battery cell, such as figure 1 As shown, the method includes the following steps:

[0033] S1, making the temperature of the offline power battery unit reach a preset temperature, and the offline power battery unit has a preset health degree. In the offline state, the preset temperature can be manually controlled and measured; the health of the selected power battery is known, for example, the SOH of a new power battery is 100%; for a power battery that has been used for a period of time, according to the SOH The current SOH can be calculated by using the fixed discharge parameters to discharge the power battery. Since the discharge current value and discharge time in the offline state are controllable, the SOH estimation method based on internal resistance can not be used in the offline state. , while using the discharge capacity and full capacity for c...

Embodiment 2

[0053] An embodiment of the present invention provides a method for determining the health of an online power battery using the method for calculating the internal resistance of an offline power battery in Embodiment 1. This method can be applied to determine the SOH of a vehicle-mounted power battery in normal use. Such as figure 2 The method shown includes the following steps:

[0054] S'1, obtain the internal resistance value and temperature value of the online power battery in the online power battery. The specifications of the online power battery monomer and the offline power battery monomer in embodiment 1 are the same, and the two are power batteries of the same model , the rated power, rated current value, rated internal resistance and other parameters of the two are the same; the internal resistance value and temperature value of the vehicle power battery in use can be measured by the vehicle controller, power battery management system and sensors. Regarding the op...

Embodiment 3

[0071] This embodiment provides a device for calculating the internal resistance of a single off-line power battery, such as image 3 The unit shown consists of:

[0072] The offline power battery unit initialization unit 31 is used to make the temperature of the offline power battery unit reach the preset temperature, and the offline power battery unit has a preset health degree;

[0073] The first acquisition unit 32 is used to acquire the current voltage value U' of the offline power battery unit 0 ;

[0074] The charging unit 33 is used to charge the offline power battery unit multiple times in sequence according to different charging parameters;

[0075] The second acquisition unit 34 is used to acquire the voltage value U' of the off-line power battery unit after the last charge 1 ;

[0076] The internal resistance calculation unit 35 is used to calculate the internal resistance value using the following formula:

[0077] R' 1 =(U' 1 -U' 0 ) / I,

[0078] where R'...

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Abstract

The invention provides a power cell internal resistance calculation method, and a health degree determination method and device. The internal resistance calculation method for an offline power cell comprises steps that temperature of the offline power cell is made to reach preset temperature, and the offline power cell has a preset health degree; a present voltage value U'0 of the offline power cell is acquired; the offline power cell is charged for multiple times sequentially according to different charging parameters; the voltage value U'1 of the offline power cell after last-time charging is acquired; the internal resistance is calculated through utilizing a formula R'1=(U'1-U'0) / I, the R'1 stands for the internal resistance, and the I is a rated current value of the offline power cell.

Description

technical field [0001] The invention relates to the field of performance evaluation of rechargeable power batteries, in particular to a method for calculating the internal resistance of a power battery and a method and device for determining the health degree. Background technique [0002] The state of health (SOH) of the power battery is an important indicator of the performance of the power battery. Its standard definition is the capacity released by the power battery from the full state to the cut-off voltage under standard conditions and the corresponding standard capacity ratio. Scientific estimation of power battery SOH is necessary for real-time prediction of power battery health status. SOH evaluation is of great significance to further power battery operation and maintenance, to realize important aspects of long-term reliable work of power batteries, and to prevent catastrophic accidents. [0003] In this field, an offline power battery refers to a power battery t...

Claims

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Application Information

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IPC IPC(8): G01R27/14G01R31/36
CPCG01R27/14G01R31/389G01R31/392
Inventor 李琰
Owner BEIJING BORGWARD AUTOMOBILE CO LTD
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