CN207945786U - Internal resistance of cell detection circuit and energy-storage battery air-conditioning - Google Patents
Internal resistance of cell detection circuit and energy-storage battery air-conditioning Download PDFInfo
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- CN207945786U CN207945786U CN201820226113.7U CN201820226113U CN207945786U CN 207945786 U CN207945786 U CN 207945786U CN 201820226113 U CN201820226113 U CN 201820226113U CN 207945786 U CN207945786 U CN 207945786U
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Abstract
There is provided a kind of internal resistance of cell detection circuit and energy-storage battery air-conditioning, wherein the internal resistance of cell detection circuit includes：Constant current source module, it is connected in parallel on by the first battery pack and the concatenated mesuring battary group both ends of the second battery pack, first battery pack and the second battery pack are connected by multiple batteries respectively, and the sampling end of constant current source module is connected between the tail grade battery of the first battery pack and the chopped-off head battery of the second battery pack；Constant current source module is respectively turned on the first battery pack and the second battery pack under the triggering of switching signal, the sampling end of constant current source module samples the first battery pack respectively and the second battery pack be respectively turned on after response signal；Signal modulation circuit obtains sampled voltage signal and sampled current signals for modulate response signals；Computing circuit, for obtaining the internal resistance of mesuring battary group according to sampled voltage signal and sampled current signals.The utility model reduces on-line checking internal resistance of cell error.
Description
Technical field
The utility model is related to air-conditioning technical fields, in particular to a kind of internal resistance of cell detection circuit and energy storage electricity
Pond air-conditioning.
Background technology
The accumulation energy air conditioners such as PV air-conditioner, hybrid power new-energy automotive air-conditioning be multi power source system, energy abundance,
Electric energy is not only consumed, the energy content of battery is also consumed by.Main power source of the energy-storage battery as air-conditioning, the quality of performance, directly certainly
Determine the performance of air-conditioning, and the internal resistance of cell directly reflects that the health status of battery, internal resistance detection are particularly important.
Conventional internal resistance of cell detection calculates internal resistance r mainly by acquiring the terminal voltage U and charging and discharging currents I of battery
=U/I, and according to internal resistance of cell value size, judge its degradation.Since the internal resistance of battery all belongs in the order of magnitude of milliohm
Small-signal, using the program, accuracy of detection is low, on-line checking energy force difference, and especially under strong interferers environment, internal resistance error is high
Up to 80% or more.
Therefore, how to reduce on-line checking internal resistance of cell error becomes technical problem urgently to be resolved hurrily.
Utility model content
The utility model provides a kind of internal resistance of cell detection circuit and energy-storage battery air-conditioning, to reduce on-line checking battery
Internal resistance misses.
In order to solve the above technical problems, according to the one side of the embodiment of the present disclosure, the utility model provides a kind of electricity
Pond internal resistance detection circuit, including：
Constant current source module is connected in parallel on by the first battery pack and the concatenated mesuring battary group both ends of the second battery pack, the first electricity
Pond group and the second battery pack are connected by multiple batteries respectively, and the sampling end of constant current source module is connected to the tail grade electricity of the first battery pack
Between pond and the chopped-off head battery of the second battery pack；Constant current source module be respectively turned under the triggering of switching signal the first battery pack and
Second battery pack, the sampling end of constant current source module samples the first battery pack respectively and the second battery pack be respectively turned on after response letter
Number；Signal modulation circuit obtains sampled voltage signal and sampled current signals for modulate response signals；Computing circuit is used for
The internal resistance of mesuring battary group is obtained according to sampled voltage signal and sampled current signals.
Optionally, constant current source module includes：PWM wave circuit, for generating the first significant level and the second significant level；The
One switching tube, control pole are connected to the signal output end of PWM wave circuit, and the first pole of first switch pipe is connected to the first battery
The anode of the chopped-off head battery of group；Second switch pipe, control pole are connected to the signal output end of PWM wave circuit, second switch pipe
The first pole be connected to the second pole of first switch pipe, the second pole of second switch pipe is connected to the tail grade battery of the second battery pack
Cathode；Constant-current source is connected between the second pole of first switch pipe and ground；When first significant level arrives, conducting first is opened
Guan Guan；When second significant level arrives, second switch pipe is connected；First significant level and the second significant level are respectively high level
With low level or low level and high level.
Optionally, signal modulation circuit includes：Voltage sampling circuit obtains sampled voltage letter for modulate response signals
Number；Current sampling circuit obtains sampled current signals for modulate response signals.
Optionally, further include：Filter circuit, the sampled voltage signal for being modulated to voltage sampling circuit are filtered
Wave, and/or for being filtered to the sampled current signals that current sampling circuit is modulated.
Optionally, computing circuit obtains mesuring battary group according to the phase difference of sampled voltage signal and sampled current signals
Internal resistance.
Optionally, computing circuit obtains the internal resistance of mesuring battary group using following formula：Wherein, r
For the internal resistance of mesuring battary group, U is the response voltage of the first battery pack, and I is the virtual value of the first secondary frequencies of Fourier transformation,
ΦiFor the phase of sampled current signals, ΦuThe phase of sampled voltage signal.
According to the another aspect of the embodiment of the present disclosure, a kind of energy-storage battery air-conditioning is provided, including：
Air-conditioner set, for specified region to be freezed or heated；Energy-storage battery group, for providing electricity to air-conditioner set
Source；Internal resistance of cell detection circuit disclosed in above-mentioned first aspect, the internal resistance for detecting energy-storage battery group.
In the present invention, constant current source module is respectively turned on the first battery pack and the second electricity under the triggering of switching signal
Pond group, as a result, the sampling end of constant current source module can sample the first battery pack respectively and the second battery pack be respectively turned on after sound
Induction signal is modulated to obtain sampled voltage signal and sampled current signals by signal modulation circuit, according to sampled voltage signal and
Sampled current signals can obtain the internal resistance of mesuring battary group, since response signal is obtained by the constant-current source applied in internal circuit
It arrives, therefore, can be preferably anti-interference when detecting the internal resistance of cell, the influence that external environment interference fringe comes is reduced, is reduced
Line detects internal resistance of cell error, improves accuracy of detection.
Description of the drawings
Fig. 1 is a kind of internal resistance of cell detection circuit structural schematic diagram disclosed in the utility model embodiment；
Fig. 2 is a kind of constant-current source modular structure principle schematic disclosed in the utility model embodiment.
Specific implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the utility model.On the contrary, they be only with such as
The example of the consistent device and method of some aspects be described in detail in the appended claims, the utility model.
In order to reduce on-line checking internal resistance of cell error, present embodiment discloses a kind of internal resistance of cell detection circuits, please join
Fig. 1 is examined, is a kind of internal resistance of cell detection circuit structural schematic diagram disclosed in the present embodiment, which includes：
Constant current source module 1, signal modulation circuit 2 and computing circuit 3, wherein：
Constant current source module 1 is connected in parallel on by 42 concatenated mesuring battary group both ends of the first battery pack 41 and the second battery pack, this
In embodiment, the first battery pack 41 and the second battery pack 42 are connected by multiple batteries respectively, the sampling end connection of constant current source module
To between the tail grade battery and the chopped-off head battery of the second battery pack 42 of the first battery pack 41.In a particular embodiment, such as it is to be measured
Battery pack is connected in series by N batteries, and the first battery pack 41 is that Section 1 to N/2 batteries are connected in series, the second battery pack 42
Save to n-th batteries and be connected in series for N/2+1, at this point, the sampling end of constant current source module be connected to N/2 batteries cathode and
Between the anode of N/2+1 batteries.It should be noted that in the present embodiment, it is not intended to limit the first battery pack 41 and the second electricity
The specific concatenated number of battery cells of pond group 42, the first battery pack 41 and 42 concatenated number of battery cells of the second battery pack can be identical,
It can be different.
Constant current source module 1 is respectively turned on the first battery pack 41 and the second battery pack 42, constant current under the triggering of switching signal
The sampling end of source module 1 samples the first battery pack 41 respectively and the second battery pack 42 be respectively turned on after response signal.Specific
In embodiment, the first battery pack 41 and the second battery pack is connected in the electric current provided by constant-current source under the triggering of switching signal
42 can obtain different responses, therefore, sample response signal respectively by the sampling end of constant current source module 1, can analyze and wait for
Survey the internal resistance of battery pack.
Signal modulation circuit 2 obtains sampled voltage signal and sampled current signals for modulate response signals.Specific real
It applies in example, signal modulation circuit 2 may include voltage sampling circuit 21 and current sampling circuit 22, wherein voltage sampling circuit
21 obtain sampled voltage signal for modulate response signals；Current sampling circuit 22 obtains sample rate current for modulate response signals
Signal.
Computing circuit 3 is used to obtain the internal resistance of mesuring battary group according to sampled voltage signal and sampled current signals.
For the response signal and sine wave signal after extracting battery energization in numerous interference signals, optionally implementing
In example, which further includes：Filter circuit, for modulating obtained sampled voltage to voltage sampling circuit 21
Signal is filtered, and/or is filtered for modulating obtained sampled current signals to current sampling circuit 22.Specific real
It applies in example, high-pass filtering circuit can be formed by capacitance, resistance, thus, it is possible to sampled voltage signal and sample rate current
Signal is filtered frequency-selecting and obtains sine wave signal.
Referring to FIG. 2, for a kind of constant-current source modular structure principle schematic disclosed in the present embodiment, in optional embodiment
In, constant current source module includes：PWM wave circuit, first switch pipe Q1, second switch pipe Q2 and constant-current source HLY, wherein：
PWM wave circuit is for generating the first significant level and the second significant level.In the present embodiment, alleged first is effectively electric
It puts down as the level of first switch pipe Q1 is connected, can be high level, can also be low level, with specific reference to first switch pipe Q1's
Conduction level determines；Alleged second significant level is the level that second switch pipe Q2 is connected, and can be high level, can also be
Low level is determined with specific reference to the conduction level of second switch pipe Q2.
The control pole (such as grid) of first switch pipe Q1 is connected to the signal output end of PWM wave circuit, first switch pipe
The first pole (such as source electrode) A of Q1 is connected to the anode of the chopped-off head battery of the first battery pack.The control pole of second switch pipe Q2 connects
It is connected to the signal output end of PWM wave circuit, the first pole of second switch pipe Q2 is connected to the second pole of first switch pipe Q1, and second
The second pole B of switching tube Q2 is connected to the cathode of the tail grade battery of the second battery pack.Constant-current source HLY is connected to first switch pipe Q1
The second pole (such as drain electrode) between ground.In the present embodiment, constant-current source HLY is also connected on mesuring battary group and first switch pipe
Between the second pole of Q1, specifically, one end of constant-current source HLY is connected to the tail grade battery and the second battery pack of the first battery pack
Between chopped-off head battery, the other end is connected to the second pole of first switch pipe Q1.
In the present embodiment, using the first significant level as high level, the second significant level be low level for illustrate：The
When one significant level arrives, first switch pipe Q1 is connected, at this point, the first battery pack accesses constant-current source closed circuit, to the first electricity
Pond group electric discharge, therefore the voltage of the first battery pack declines, at this point, the second battery pack is in non-discharged state, voltage can rebound；Second
When significant level arrives, second switch pipe Q2 is connected, at this point, the second battery pack accesses constant-current source closed circuit, gives the second battery
Group electric discharge.In the present embodiment, the first battery pack and the variation of the second battery voltage are opposite when being just high level with PWM.Due to
The modulating action of PWM is equivalent to from the point of view of single battery and experienced electric discharge, stops two processes of electric discharge in one cycle.It puts
Voltage declines during electricity, and during stopping electric discharge, voltage bounce increases.It is appropriate according to the characteristic of battery and polarization time difference
Control the duty ratio of PWM, the electric current of frequency and constant-current source.The exciting current and response voltage that battery can be obtained are that there are phase differences
And with it is online when introduce measurement noise periodic signal of square wave.For single battery, from the effect of multiple PWM cycles modulation
It sees, is equivalent to each battery and takes part in cycle square wave current excitation, and make cycle square wave voltage responsive.
First significant level and the second significant level are respectively high level and low level or low level and high level.Having
In body embodiment, the first significant level and can be determined according to the conduction level of first switch pipe Q1 and second switch pipe Q2
The height of two significant levels.
In a particular embodiment, computing circuit obtains to be measured according to the phase difference of sampled voltage signal and sampled current signals
The internal resistance of battery pack specifically obtains the internal resistance of mesuring battary group using following formula：
Wherein, r is the internal resistance of mesuring battary group, and U is the response voltage of the first battery pack, and I is Fourier transformation first time
The virtual value of frequency, ΦiFor the phase of sampled current signals, ΦuThe phase of sampled voltage signal.
The present embodiment also discloses a kind of energy-storage battery air-conditioning, including：Air-conditioner set, energy-storage battery group and internal resistance of cell inspection
Slowdown monitoring circuit, wherein：Air-conditioner set is used to that specified region to be freezed or be heated；Energy-storage battery group is used to provide to air-conditioner set
Power supply；Internal resistance of cell detection circuit disclosed in above-described embodiment, the internal resistance for detecting energy-storage battery group.
Internal resistance of cell detection circuit and energy-storage battery air-conditioning disclosed in the present embodiment, constant current source module are touched switching signal
It gives and is respectively turned on the first battery pack and the second battery pack, the sampling end of constant current source module can sample the first electricity respectively as a result,
Pond group and the second battery pack be respectively turned on after response signal, modulate to obtain sampled voltage signal by signal modulation circuit and adopt
Sample current signal can obtain the internal resistance of mesuring battary group according to sampled voltage signal and sampled current signals, since response is believed
It number is obtained by the constant-current source applied in internal circuit, therefore, can be preferably anti-interference when detecting the internal resistance of cell, it reduces
The influence that external environment interference fringe comes, reduces on-line checking internal resistance of cell error, improves accuracy of detection.
Those skilled in the art will readily occur to this practicality after considering specification and putting into practice utility model disclosed herein
Novel other embodiments.This application is intended to cover any variations, uses, or adaptations of the utility model, these
Variations, uses, or adaptations follow the general principle of the utility model and include the non-utility model of the utility model
Common knowledge in the art or conventional techniques.The description and examples are only to be considered as illustrative, this practicality is new
The true scope and spirit of type are indicated by the following claims.
It should be understood that the utility model is not limited to the accurate knot for being described above and being shown in the accompanying drawings
Structure, and various modifications and changes may be made without departing from the scope thereof.The scope of the utility model is only wanted by appended right
It asks to limit.
Claims (7)
1. a kind of internal resistance of cell detection circuit, which is characterized in that including：
Constant current source module is connected in parallel on by the first battery pack and the concatenated mesuring battary group both ends of the second battery pack, first electricity
Second battery pack described in Chi Zuhe is connected by multiple batteries respectively, and the sampling end of the constant current source module is connected to first electricity
Between the tail grade battery of pond group and the chopped-off head battery of second battery pack；
The constant current source module is respectively turned on first battery pack and second battery pack, institute under the triggering of switching signal
The sampling end for stating constant current source module samples first battery pack respectively and second battery pack be respectively turned on after response letter
Number；
Signal modulation circuit obtains sampled voltage signal and sampled current signals for modulating the response signal；
Computing circuit, for being obtained in the mesuring battary group according to the sampled voltage signal and the sampled current signals
Resistance.
2. internal resistance of cell detection circuit as described in claim 1, which is characterized in that the constant current source module includes：
PWM wave circuit, for generating the first significant level and the second significant level；
First switch pipe, control pole are connected to the signal output end of the PWM wave circuit, the first pole of the first switch pipe
It is connected to the anode of the chopped-off head battery of first battery pack；
Second switch pipe, control pole are connected to the signal output end of the PWM wave circuit, the first pole of the second switch pipe
It is connected to the second pole of the first switch pipe, the second pole of the second switch pipe is connected to the tail grade of second battery pack
The cathode of battery；
Constant-current source is connected between the second pole and ground of the first switch pipe；
When first significant level arrives, the first switch pipe is connected；When second significant level arrives, described in conducting
Second switch pipe；First significant level and second significant level be respectively high level and low level or low level and
High level.
3. internal resistance of cell detection circuit as described in claim 1, which is characterized in that signal modulation circuit includes：
Voltage sampling circuit obtains the sampled voltage signal for modulating the response signal；
Current sampling circuit obtains the sampled current signals for modulating the response signal.
4. internal resistance of cell detection circuit as claimed in claim 3, which is characterized in that further include：
Filter circuit for being filtered to the sampled voltage signal that the voltage sampling circuit is modulated, and/or is used
It is filtered in the sampled current signals that the current sampling circuit is modulated.
5. the internal resistance of cell detection circuit as described in claim 1-4 any one, which is characterized in that the computing circuit according to
The phase difference of the sampled voltage signal and the sampled current signals obtains the internal resistance of the mesuring battary group.
6. internal resistance of cell detection circuit as claimed in claim 5, which is characterized in that the computing circuit is obtained using following formula
To the internal resistance of the mesuring battary group：
Wherein, r is the internal resistance of the mesuring battary group, and U is the response voltage of the first battery pack, and I is Fourier transformation first time
The virtual value of frequency, ΦiFor the phase of the sampled current signals, ΦuThe phase of the sampled voltage signal.
7. a kind of energy-storage battery air-conditioning, which is characterized in that including：
Air-conditioner set, for specified region to be freezed or heated；
Energy-storage battery group, for providing power supply to the air-conditioner set；
Internal resistance of cell detection circuit as claimed in any one of claims 1 to 6, the internal resistance for detecting the energy-storage battery group.
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| CN108224710A (en) * | 2018-02-08 | 2018-06-29 | 珠海格力电器股份有限公司 | Internal resistance of cell detection circuit and energy-storage battery air-conditioning |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108224710A (en) * | 2018-02-08 | 2018-06-29 | 珠海格力电器股份有限公司 | Internal resistance of cell detection circuit and energy-storage battery air-conditioning |
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