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Battery parameter acquisition method and device, and terminal equipment

A technology of battery parameters and acquisition methods, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems such as inaccurate identification results, and achieve the effect of solving inaccurate identification results and overcoming noise interference

Active Publication Date: 2019-07-09
江西猛犸电动科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the embodiments of the present invention provide a battery parameter acquisition method, device, and terminal equipment to solve the problem of inaccurate identification results of the current battery model identification battery parameters

Method used

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  • Battery parameter acquisition method and device, and terminal equipment
  • Battery parameter acquisition method and device, and terminal equipment
  • Battery parameter acquisition method and device, and terminal equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 1 As shown, this embodiment provides a battery parameter acquisition method, which specifically includes:

[0039] Step S101: Establish an equivalent circuit model of the battery.

[0040] In a specific application, the equivalent circuit model of the above-mentioned battery is a first-order equivalent circuit model, and the circuit model of the equivalent circuit model is as follows: figure 2 As shown, the mathematical model to obtain the first-order equivalent circuit model is:

[0041]

[0042] Among them, E is the terminal voltage, V OCV is the open circuit voltage, R 0 is the ohmic internal resistance, R 1 C 1 Used to describe the polarization characteristics of the battery during charging and discharging, the polarization resistance R 1 The voltage across the V 1 , I charge and discharge current.

[0043] After discretizing the above first-order equivalent circuit model, we get:

[0044]

[0045] Step S102: Obtain open circuit voltag...

Embodiment 2

[0062] Such as Figure 4 As shown, in this embodiment, step S103 in Embodiment 1 specifically includes:

[0063] Step S201: Determine the state equation of the battery according to the equivalent circuit model of the battery.

[0064] In a specific application, according to the discretization equation of the first-order equivalent circuit model, the state equation of the battery is as follows:

[0065]

[0066]

[0067]

[0068]

[0069] Step S202: Set the initial value of the filter, including the state vector at the initial moment, the initial state estimation error covariance, the system noise covariance matrix, the measurement noise covariance matrix, and the symmetric positive definite matrix.

[0070] In a specific application, set the initial value of the filter related to the filter, including the state vector at the initial moment State estimation error covariance matrix P + h,0 , System noise covariance matrix Q h,0 , Measurement noise covariance ma...

Embodiment 3

[0084] Such as Figure 5 As shown, this embodiment provides a battery parameter acquisition device 100 for performing the method steps in the first embodiment, which includes a model building module 101 , a voltage acquisition module 102 , an identification module 103 and a parameter acquisition module 104 .

[0085] The model building module 101 is used for building an equivalent circuit model of the battery.

[0086] The voltage acquisition module 102 is used to acquire open circuit voltages at different battery temperatures.

[0087] The identification module 103 is used for performing parameter identification on the equivalent circuit model according to the open circuit voltage curves at different battery temperatures based on the adaptive H infinite filter.

[0088] The parameter acquiring module 104 is used for acquiring and displaying battery parameters according to the parameter identification result.

[0089] In one embodiment, the voltage acquisition module 103 inc...

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Abstract

The invention is suitable for the technical field of the battery, and provides a battery parameter acquisition method and device, and terminal equipment. The method comprises the following steps: establishing an equivalent circuit model of a battery; acquiring open-loop voltages at different battery temperatures; performing parameter distinguishing on the equivalent circuit model according to an open-loop voltage curve under different battery temperatures based on self-adaptive H infinite filtering; and acquiring and displaying battery parameters according to a parameter distinguishing result.Offline data and online data are combined by establishing the equivalent model of the battery, the accurate distinguishing on the parameters of the battery equivalent model under different temperatures and different cyclic life can be realized, the parameter distinguishing is performed based on the self-adaptive H infinite filtering theory, the noise interference is effectively overcome, the battery parameters can be accurately estimated in real time, and the problem that the distinguishing result for distinguishing the battery parameters of the battery model at present is inaccurate is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a battery parameter acquisition method, device and terminal equipment. Background technique [0002] With the energy crisis and environmental pollution, new energy vehicles have gradually become the best choice for automobile development. Due to the advantages of high energy density, long cycle life, and no memory, lithium-ion batteries have become a better choice for battery systems in new energy vehicles. In order to better ensure the safety of the battery and ensure the output of the battery's performance, it is necessary to establish a mathematical model of the lithium-ion battery when studying the basic characteristics and usage of the lithium-ion battery, such as the internal resistance model, the first-order RC model, the second-order RC model, neural network model, etc., and then identify the parameters in the model through measurable related physical quant...

Claims

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Application Information

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IPC IPC(8): G01R31/367G01R31/389
Inventor 吴明舒星
Owner 江西猛犸电动科技有限公司
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