Method for measuring electric quantity of lithium ion batteries and its device

A technology of lithium ion battery and measurement method, which is applied in the field of lithium battery power measurement to achieve the effect of avoiding residual power measurement error

Inactive Publication Date: 2003-07-23
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

The disadvantage of the integration method is that it needs to memorize and store the battery's power consumption history during the discharge cycle in order to accumulate the total discharge capacity
It was further suggested that when discharging with different load currents, the measured terminal voltage of the battery can be adjusted to the terminal voltage of the reference curve by introducing a correction amount, and the remaining power of the battery can be determined from this, but the voltage method still cannot avoid different aging effects. The measurement error caused by the degree of battery measurement

Method used

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  • Method for measuring electric quantity of lithium ion batteries and its device
  • Method for measuring electric quantity of lithium ion batteries and its device
  • Method for measuring electric quantity of lithium ion batteries and its device

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0018] Such as figure 1 As shown, the measuring device of a kind of lithium-ion battery power of the present invention is made up of casing and microcomputer, charge current control circuit, charge and discharge current signal amplifying circuit, current detection circuit, sinusoidal oscillator, small signal sinusoidal modulation discharge circuit, The AC impedance detection circuits are connected to each other. The microcomputer can display the test results through a display. The entire test device is actually a real-time detection system under the control of a microcomputer.

[0019] Such as Image 6 As shown, the microcomputer controls the closed state of the switches K204, K201, K202, and K301 through I / O, so that the measuring device can be in the state of charging and discharging, open circuit voltage detection and AC impedance detect...

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Abstract

First, the method obtains the group of relation curves and fitting functions between the surplus energy and the open circuit voltage in the service time of lithium ion batteries. Based on the modified module value of the low frequency alternating current impedance, the one of the said curve or fitting function is selected. Based on the open circuit voltage and the selected fitting function, the surplus energy of the battery is calculated out. The device includes the cast and the internal circuit boards composed of interconnection of the microcomputer, the circuit for controlling the charge current, the amplification circuit for charging and discharging current signal, the current measurement circuit and thue pure oscillator etc.

Description

(1) Technical field [0001] The invention relates to the technical field of lithium battery power measurement, in particular to a method and a device for measuring the power of a lithium ion battery. (2) Background technology [0002] The measurement of the remaining power of the lithium battery is generally used at present by the product method and the voltage method. The product algorithm is to continuously detect the discharge current and discharge time of the battery at each moment to accumulate the discharge power of the battery. Then subtract the accumulated discharge capacity from the fully charged capacity of the battery (usually the nominal capacity of a new battery) to obtain the remaining capacity. The disadvantage of the integration method is that it needs to memorize and store the electricity consumption history of the battery during the discharge cycle in order to accumulate the total discharge capacity. However, as the number of battery charging and dischargi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 林悦波
Owner SOUTH CHINA UNIV OF TECH
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