TWI484204B - A method of detecting lithium batteries - Google Patents

Description

Lithium battery detection method

The invention relates to a battery state detection technology, in particular to a battery health state detection method.

In order to meet the world trend of energy saving and carbon reduction, electric drive is gradually replacing the traditional petrochemical fuel drive. For the long-term use of electronic products, the stability of battery electrical and cycle life is very important; in the past, usually The impedance of the open circuit voltage of the battery is measured by DC impedance, and the impedance of the electrode is determined by the contact between the electrode and the electrolyte during the charge and discharge process to determine the state of the electrode damage. Battery life status. At present, the general battery management system only has the functions of monitoring the voltage and balance of the battery core, and it is still impossible to effectively judge the health status of each battery core. Generally, when the power battery health status of an electric vehicle is less than 70% (the capacity of the battery that is effectively recovered by charging is <70%), it will be eliminated due to the inability to perform the action of the electric vehicle. However, such batteries may not have energy. For other uses, long-term cumulative detection errors result in a large amount of waste of available resources and an increase in the overall economic cost of society.

In view of the shortcomings of the conventional technology, the present invention provides a lithium battery detection method, which uses a current pulse test method and an AC impedance test method to measure battery performance data. Compared with the prior art, the present invention can more accurately grasp the battery pack. In the health status of individual batteries, and to find out the traditional technology can not be identified, the battery core can be reused for secondary use, reducing resource waste and reducing the cost of acquisition.

The invention provides a lithium battery detecting method, comprising: providing a battery; standing the battery for a first time period; performing a discharging operation on the battery for a second time period; and after the battery is left for a third period of time, the amount Measure the voltage of the battery to obtain a first voltage; After the battery performs the discharge operation of the fourth time period, measuring the voltage of the battery to obtain a second voltage; measuring the voltage difference between the first voltage and the second voltage to obtain a third voltage difference, The value of the wave signal and the feedback signal value is outside the range of the average value, and the purpose of determining the condition of the plurality of lithium batteries is achieved.

The above summary, the following detailed description and the accompanying drawings are intended to further illustrate the manner, the Other objects and advantages of the present invention will be described in the following description and drawings.

Symbol Description

1‧‧‧Detection device

2‧‧‧Multiple connection unit

3‧‧‧Lithium battery

11‧‧‧Processing unit

12‧‧‧ Pulse wave generating unit

Figure 1 is a structural diagram of a lithium battery detection method.

Fig. 2 is a structural diagram of a detecting device for a lithium battery detecting method.

The embodiments of the present invention are described below by way of specific examples, and those skilled in the art can readily appreciate other advantages and functions of the present invention from the disclosure herein.

Referring to FIG. 1 , a method for detecting a lithium battery according to the present invention includes: a detecting device 1 having a plurality of connecting units 2, and electrically connecting a plurality of lithium batteries by using the plurality of connecting units 2 The pool 3, wherein the detecting device 1 further includes a processing unit 11 and a pulse wave generating unit 12, the processing unit 11 is a computer, and the pulse wave generating unit 12 is configured to generate a pulse wave with a delay time. For the voltage of each cell in the battery pack, the program of "1 static T1 - 2 discharge T2 - 2 static T3 - 4 discharge T4" is performed under the charging current of 0.2 C in the battery pack. 3, after the voltage value of T3 is reset, "4 discharge T4" is subtracted. When the pulse signal is transmitted to the plurality of lithium batteries, the pulse signal is subjected to the action of the lithium battery 3, and a pulse signal is mutated to one time. The pulse wave voltage after the internal resistance of the lithium battery 3 is reduced, and the feedback signal of the pulse intensity reduction is obtained by each ΔV2, and the processing unit 11 receives the feedback signal and compares the pulse signal and the feedback signal. ΔV2 value has data outside the range of the average value, reaching the judgment Don't repeat the purpose of lithium battery 3, further reduce the waste of resources and cost.

The above-described embodiments are merely illustrative of the features and functions of the present invention and are not intended to limit the scope of the technical scope of the present invention. Anyone who is familiar with this skill can Modifications and variations of the above-described embodiments are possible in the spirit and scope of the invention. Therefore, the scope of protection of the present invention should be as set forth in the scope of the claims described below.

1‧‧‧Detection device

2‧‧‧Multiple connection unit

3‧‧‧Lithium battery

Claims (9)

A method for detecting a lithium battery, the method comprising: providing a detecting device, the detecting device having a plurality of connecting units; providing at least one lithium battery; electrically connecting the lithium battery to the connecting unit; generating a test signal by using the detecting device To the lithium battery; when the test signal is subjected to the lithium battery, a feedback signal value is generated, wherein the feedback signal value is, each battery cell in the battery pack is under a charging current of 0.2 C, and "1 static Set T1 - 2 discharge T2 - 3 to stop T3 - 4 discharge T4", in the above procedure, take the voltage value after "3 static T3" minus "4 discharge T4" For the feedback signal value; receiving the feedback signal, the purpose of determining the status of the plurality of lithium batteries is achieved by comparing the pulse signal and the feedback signal. The method for detecting a lithium battery according to claim 1, wherein the detecting device further comprises a processing unit and a pulse wave generating unit. A method for detecting a lithium battery according to claim 2, wherein the processing unit is a computer. A method for detecting a lithium battery according to claim 1, wherein the test signal is a pulse wave voltage having a delay time. The method for detecting a lithium battery according to the first aspect of the invention, wherein the feedback signal is a pulse wave voltage that is reduced by an internal resistance of the lithium battery. A lithium battery detecting method according to claim 1, wherein the T1 time is 30 seconds to 90 seconds. A method for detecting a lithium battery according to claim 1, wherein the T2 time is from 1 second to 30 seconds. A lithium battery detecting method according to claim 1, wherein the T3 time is 1 second to 30 seconds. A method for detecting a lithium battery according to claim 1, wherein the T4 time is from 1 second to 30 seconds.