CN104034967A - Method for rapidly and accurately detecting internal resistance of secondary battery - Google Patents
Method for rapidly and accurately detecting internal resistance of secondary battery Download PDFInfo
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- CN104034967A CN104034967A CN201410246408.7A CN201410246408A CN104034967A CN 104034967 A CN104034967 A CN 104034967A CN 201410246408 A CN201410246408 A CN 201410246408A CN 104034967 A CN104034967 A CN 104034967A
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Abstract
The invention relates to a method for rapidly and accurately detecting the internal resistance of a secondary battery. The method comprises the following steps: (1) applying characteristic current I to the two ends of the secondary battery, wherein the maximum current of the characteristic current is 0.05-0.5C/h, and the conduction time is 1-15 minutes; (2) measuring voltage U at the two ends of the secondary battery while applying the characteristic current I to obtain a U-t chart a certain period after conduction, and acquiring six voltage values, namely, U1, U2, U3, U4, U5 and U6 on the U-t chart; (3) calculating the solution resistance of the secondary battery according to 'solution resistance= (U2-U1+U3-U4)/(2I)'; calculating the reaction resistance of the secondary battery according to 'reaction resistance= (U5-U2+U4-U6)/(2I)'; calculating the total internal resistance of the secondary battery according to 'internal resistance= solution resistance+ reaction resistance'. By adopting the detection method, the internal resistance of the secondary battery can be detected rapidly, the solution resistance and the reaction resistance in the internal resistance of the secondary battery can be distinguished, and rapid detection is performed on the basis of distinguishing. The method has high detection accuracy, and is easy to operate.
Description
Technical field
The present invention relates to internal resistance of rechargeable battery detection field, be specifically related to a kind of method that fast, accurately detects internal resistance of rechargeable battery.
Background technology
For the detection of internal resistance of rechargeable battery, particularly, to fast, accurately the detecting of internal resistance of rechargeable battery, be in the stage of fumbling.If application publication number is the scheme of the related detection internal resistance of rechargeable battery of the patents such as CN201310641904, CN200710075214, CN201110031598, CN201010138045 and other document, mainly contain three classes: (1) measures internal resistance of rechargeable battery by AC impedence method, though this method can be measured respectively solution resistance and reaction resistance two parts in internal resistance of rechargeable battery, but high to instrument and equipment requirement, testing cost is high, the time is longer; (2) by volt-ampere characteristic, measure internal resistance of rechargeable battery, though this method can detect time dependent internal resistance of rechargeable battery, detection time is long, and can not distinguish solution resistance and reaction resistance, and testing cost is high, weak effect.(3) condition of constant Current step method is measured internal resistance of rechargeable battery, relate at present as the application publication number patent that is CN201110031598, this technology can only detect the solution resistance in internal resistance of rechargeable battery, has ignored the existence of reaction resistance, and the internal resistance detection of secondary cell is existed to larger error.
Summary of the invention
The invention provides a kind of method that fast, accurately detects internal resistance of rechargeable battery.This detection method not only can fast detecting secondary cell internal resistance, and because adopting the electric current of certain size range, the present invention carries out the detection of condition of constant Current step method, and the voltage of secondary cell is continued to detect in the special time before and after condition of constant Current step, the voltage jump causing in the time of can current step being detected (because solution resistance exists the change in voltage causing), the current step variation (battery two electrode electrostatic double layers discharge and recharge the change in voltage causing) of the interior voltage of special time afterwards can be detected again, therefore can distinguish the solution resistance in internal resistance of rechargeable battery and reaction resistance, and carry out fast detecting on the basis of distinguishing, and, in order to reduce measuring error, in characteristic current of the present invention, comprising electrical current step and interruption current step secondary current step, the method for averaging by secondary step reduces measuring error, and accuracy of detection is higher.
Existing condition of constant Current step method is surveyed the voltage jump causing when the internal resistance of cell is only measured current step, does not continue to detect, and therefore can't detect reaction resistance, and for secondary cell, measuring error is large.
The present invention adopts following technical scheme:
A method for fast detecting internal resistance of rechargeable battery, is characterized in that, comprises the following steps:
(1) at secondary cell two ends, add a characteristic current I(as shown in Figure 2), the maximum current of described characteristic current is 0.05C/h ~ 0.5C/h, the rated capacity that wherein C is secondary cell, conduction time 1～15min;
(2) when adding characteristic current I, measure the voltage U at secondary cell two ends, be energized the U-t figure (as shown in Figure 3) after a period of time, on described U-t figure, obtain six magnitude of voltage U
1, U
2, U
3, U
4, U
5and U
6; U
1for instantaneous voltage before voltage jump for the first time, U
2for the instantaneous voltage after voltage jump for the first time, U
3for instantaneous voltage before voltage jump for the second time, U
4for instantaneous voltage after voltage jump for the second time, U
6for the T time after voltage jump for the second time (herein T get telomutation after voltage reach the platform time used, the time be t during telomutation
2, t
2+ T instantaneous voltage is constantly U herein
6) time instantaneous voltage, U
5for the T time after voltage jump for the first time, (T value is according to U herein
6the T of place gets, and numerical value is identical, the time is t during promutation
1, t
1+ T instantaneous voltage is constantly U herein
5) time instantaneous voltage;
(3) according to " solution resistance=(U
2-U
1+ U
3-U
4)/(2I) " calculate the solution resistance of secondary cell, according to " reaction resistance=(U
5-U
2+ U
4-U
6)/(2I) " calculate the reaction resistance of secondary cell, total internal resistance of calculating secondary cell according to " internal resistance=solution resistance+reaction resistance ".The method of averaging by secondary step here embodies, and the present invention surveys and in internal resistance, comprises this thought of reacting internal resistance and also here embody.
Beneficial effect of the present invention is: the invention provides a kind of method that fast, accurately detects internal resistance of rechargeable battery, this detection method not only can fast detecting secondary cell internal resistance, and can distinguish the solution resistance in internal resistance of rechargeable battery and reaction resistance, and carry out fast detecting on the basis of distinguishing, accuracy of detection is high, simple to operate.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of detection method of the present invention.
Fig. 2 is that the present invention is at the I-t of secondary cell characteristic current that two ends add figure.
Fig. 3 is the U-t figure at the present invention secondary cell two ends after secondary cell two ends add characteristic current.
Fig. 4 is the I-t figure of the characteristic current that adds at lithium ion battery two ends in embodiment 1.
Fig. 5 is the U-t figure that adds lithium ion battery two ends after characteristic current recording in embodiment 1.
Fig. 6 is the I-t figure of the characteristic current that adds at lithium ion battery two ends in embodiment 2.
Fig. 7 is the U-t figure that adds lithium ion battery two ends after characteristic current recording in embodiment 2.
Fig. 8 is the I-t figure of the characteristic current that adds at Ni-MH battery two ends in embodiment 3.
Fig. 9 is the U-t figure that adds Ni-MH battery two ends after characteristic current recording in embodiment 3.
Embodiment
embodiment 1:
Get a lithium rechargeable battery, rated capacity is 1600mAh, adds a characteristic current I(as shown in Figure 4 at its two ends), the maximum current of this characteristic current I is 100mA, conduction time 11min; When adding characteristic current, measure the voltage U at these secondary cell two ends, obtain the U-t figure (as shown in Figure 5) in 11min, on U-t figure, choose six magnitudes of voltage, wherein U
1=4.0668 volts; U
2=4.0774 volts; U
3=4.0854 volts; U
4=4.0752 volts; U
5=4.0817 volts; U
6=4.0721 volts; As calculated, the solution resistance of this battery is 0.104 Ω, and reaction resistance is 0.037 Ω, and total internal resistance is 0.141 Ω.
embodiment 2:
Get a lithium rechargeable battery, rated capacity is 2500mAh, adds a characteristic current I(as shown in Figure 6 at its two ends), the maximum current of this characteristic current I is 500mA, conduction time 11min; When adding characteristic current I, measure the voltage U at these secondary cell two ends, obtain the U-t figure (as shown in Figure 7) in 11min, on U-t figure, choose six magnitudes of voltage, wherein U
1=4.0619 volts; U
2=4.1257 volts; U
3=4.1505 volts; U
4=4.0864 volts; U
5=4.1416 volts; U
6=4.0737 volts; As calculated, the solution resistance of this battery is 0.128 Ω, and reaction resistance is 0.029 Ω, and total internal resistance is 0.157 Ω.
embodiment 3:
Get a nickel-hydrogen secondary cell, rated capacity is 2000mAh, adds a characteristic current I(as shown in Figure 8 at its two ends), the maximum current of this characteristic current I is 400mA, conduction time 11min; When adding characteristic current I, measure the voltage U at these secondary cell two ends, obtain the U-t figure (as shown in Figure 9) in 11min, on U-t figure, choose six magnitudes of voltage, wherein U
1=1.380 volts; U
2=1.388 volts; U
3=1.406 volts; U
4=1.400 volts; U
5=1.395 volts; U
6=1.394 volts; As calculated, the solution resistance of this battery is 0.018 Ω, and reaction resistance is 0.016 Ω, and total internal resistance is 0.034 Ω.
Content described in this instructions embodiment is only enumerating the way of realization of inventive concept; should not being regarded as of protection scope of the present invention only limits to the concrete form described in embodiment, and protection scope of the present invention also and in those skilled in the art, according to the present invention, conceive the equivalent technologies means that can expect.
Claims (1)
1. fast, accurately detect a method for internal resistance of rechargeable battery, it is characterized in that, comprise the following steps: (1) adds a characteristic current I at secondary cell two ends, the maximum current of described characteristic current is 0.05 ~ 0.5 C/h, conduction time 1～15min; (2) when adding characteristic current I, measure the voltage U at secondary cell two ends, be energized the U-t figure after a period of time, on described U-t figure, obtain six magnitude of voltage U
1, U
2, U
3, U
4, U
5and U
6, U wherein
1for instantaneous voltage before voltage jump for the first time, U
2for the instantaneous voltage after voltage jump for the first time, U
3for instantaneous voltage before voltage jump for the second time, U
4for instantaneous voltage after voltage jump for the second time, U
6for the instantaneous voltage during time of T after voltage jump for the second time, herein T get telomutation after voltage reach platform time used, U
5for the instantaneous voltage during time of T after voltage jump for the first time, T value is according to U herein
6the T of place gets, and numerical value is identical; (3) according to " solution resistance=(U
2-U
1+ U
3-U
4)/(2I) " calculate the solution resistance of secondary cell; According to " reaction resistance=(U
5-U
2+ U
4-U
6)/(2I) " calculate the reaction resistance of secondary cell; According to " internal resistance=solution resistance+reaction resistance ", calculate total internal resistance of secondary cell.
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Application publication date: 20140910 |