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Battery state-of-charge estimation method without current sensor

A battery state-of-charge and state-of-charge technology, which is applied in the direction of instruments, measuring electricity, and measuring electric variables, etc., can solve the problems of unguaranteed battery current prediction, difficult state of charge estimation results, cost and volume increase, etc.

Inactive Publication Date: 2019-05-14
孟锦豪
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Problems solved by technology

In portable devices, the use of current sensors means an increase in cost and volume, and the current sensor itself will also bring a certain amount of power loss
[0009] 2. Based on the state of charge estimation method without current sensor, if only voltage information is used, for lithium batteries, it is difficult to accurately obtain the state of charge of the battery due to the objective existence of the voltage platform
However, the existing method of estimating the state of charge through a simple battery model uses a too simplified model and parameter acquisition, which cannot guarantee accurate battery current prediction, and it is difficult to obtain better state of charge estimation results in practice.

Method used

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  • Battery state-of-charge estimation method without current sensor
  • Battery state-of-charge estimation method without current sensor
  • Battery state-of-charge estimation method without current sensor

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Embodiment Construction

[0075] The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the embodiments of the present invention, and are not intended to limit the embodiments of the present invention.

[0076] Such as figure 1 As shown, in an embodiment of the present invention, the overall process mainly includes three main parts: establishment of an equivalent circuit model, current prediction and state of charge estimation. figure 1 It shows the main process of this embodiment and the key models and methods used in each process. In the battery modeling process, this embodiment uses the first-order equivalent circuit model, and establishes the relationship between the parameters in the model with the state of charge and current rate through offline testing and fitting; uses ...

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Abstract

The invention belongs to the field of lithium batteries and discloses a battery state-of-charge estimation method without a current sensor. Through off-line testing, the relation between an open-circuit voltage and the state of charge of the battery is established; through pulse current testing under various conditions, the relation of a model parameter changing along with the state of charge andthe current is established by using a table look-up method, and final estimation of the state of charge of the battery is completed by fusing an ampere-hour integral method and an open-circuit voltagemethod. The method in the invention can be applied to estimation of the state of charge of a portable device; according to the method, a voltage sensor and a low-complexity algorithm are directly used to complete the estimation of the state of charge of the battery, and a current sensor is not used, such that the size, the cost and the power consumption of the portable device are reduced fundamentally, and the product can be more suitable for requirements of markets and users.

Description

technical field [0001] The invention relates to a method for estimating the state of charge of a battery without a current sensor. Background technique [0002] Lithium batteries have the characteristics of high energy density, low self-discharge rate and no memory effect, making them widely used as energy storage components in various fields. The state of charge is a key parameter that needs to be obtained in the actual application of the battery. In order to avoid irreversible damage to the battery caused by overcharging and discharging, it is necessary to ensure that the state of charge of the battery is always within a safe range. The service life of a battery is closely related to the range of state-of-charge changes in daily applications. Therefore, to ensure the safety and efficiency of the battery in the application, it is very important to obtain an accurate state of charge. However, since the battery itself is a closed system, it is not possible to detect the st...

Claims

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Application Information

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IPC IPC(8): G01R31/385
Inventor 孟锦豪刘平王建武
Owner 孟锦豪
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