CN201145709Y - Apparatus for testing battery essential resistance - Google Patents
Apparatus for testing battery essential resistance Download PDFInfo
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- CN201145709Y CN201145709Y CNU2007201967864U CN200720196786U CN201145709Y CN 201145709 Y CN201145709 Y CN 201145709Y CN U2007201967864 U CNU2007201967864 U CN U2007201967864U CN 200720196786 U CN200720196786 U CN 200720196786U CN 201145709 Y CN201145709 Y CN 201145709Y
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- internal resistance
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Abstract
The utility model provides a battery essential resistance detecting device which is characterized by comprising a battery unit, a sampling device and a controller, wherein, the battery unit consists of an excitation source and a single battery or a battery pack, and the excitation source, the single battery or the battery pack form a circuit; the sampling device is used for acquiring a voltage of two ends of a battery and current flowing through the excitation source and the battery circuit; and the controller is used for calculating the essential resistance of the single battery or the battery pack according to a current value and a voltage value outputted by the sampling device. The battery essential resistance detecting device calculates virtual values of the voltage and the current according to the acquired voltage value and the current value of the battery; the controller is used for calculating the power factor according to the voltage value and the current value, thereby obtaining the essential resistance of the battery; and the battery essential resistance detecting device calculates the essential resistance of the battery by fewer components and simple algorithm, thereby lowering the cost of a hybrid vehicle, saving the space and effectively improving the measuring accuracy and reliability.
Description
Technical field
The utility model relates to a kind of internal resistance of cell proving installation, particularly a kind of internal resistance of cell proving installation that is applied in electric motor car and PHEV.
Background technology
The application of accumulator aspect electric automobile, hybrid vehicle is more and more.What battery system generally adopted is the mode that is connected in series.The state deterioration of some cell batteries directly influences the capacity status of battery pack integral body in battery pack, and the whole volume state that also is battery pack is by a certain or several the accumulator capacity decisions that deterioration state is the most serious in the system.So the state of accurately measuring each cell is to preventing that the battery pack fault from being necessary.
The method of accumulator internal resistance test at present comprises direct-current discharge method and ac-current inject method etc.Direct-current discharge method concrete grammar is to produce a momentary load electric current by electric battery, measure the instantaneous variation of voltage on the battery electrode column then, according to calculating the internal resistance of cell, its defective is: need the frequent detection of carrying out residual capacity and demonstration, this just requires internally resistance to carry out frequent detection, can influence the residual capacity of the cruising and the minimizing battery of electric motor car, moreover number of batteries is a lot of in the electric motor car, will have caused huge battery capacity waste; Only be fit to measure high capacity cell or accumulator, small-capacity cells can't be at the big electric current of the short time in several seconds internal loading tens peaces; Big electric current has certain damage by battery to the electrode of inside battery, and influences measuring accuracy, and the direct-current discharge method can't be used on PHEV.
Its principle of ac-current inject method is: add a constant AC audio current source i at the accumulator two ends
s(t)=I
sCos (ω t+ α
i), detect battery both end voltage v then
o(t)=V
oCos (ω t+ α
o), and phase differential α between the two, according to Ohm law as can be known complex impedance be:
Wherein, V
oAnd I
sBe effective value, also can be maximal value V
OmaxAnd I
Smax, because effective value and maximal value are only poor one
Multiple, again because Z=r+jX, so have: r=|Z|cos α, r are exactly the internal resistance of cell that we need obtain.
In ac-current inject method, must not discharge by accumulator, can realize the online detection internal resistance of cell of safety, so can the performance of accumulator not impacted, the defective of ac-current inject method is to measure the phase differential between ac current signal and voltage responsive signal and the voltage and current, need in MCU, realize trigonometric function calculating etc., therefore hardware circuit and the algorithm more complicated that adopts influenced measuring accuracy.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned defective and provides a kind of measuring accuracy high and apparatus for measuring battery internal resistance simple in structure.
Goal of the invention of the present utility model is achieved through the following technical solutions:
A kind of internal resistance of cell proving installation is characterized in that: comprise battery unit, described battery unit constitutes the loop by driving source and battery cell or electric battery; Sampling apparatus, described sampling apparatus are used to gather the electric current of the voltage at battery two ends and flow through driving source and cell circuit; Controller, described controller is according to the current value of sampling apparatus output and the internal resistance of magnitude of voltage counting cell monomer or electric battery.
Group proving installation in the above-mentioned battery, wherein: be provided with sampling resistor in the described battery unit, described sampling resistor is positioned at driving source and battery cell or electric battery and constitutes on the loop, and the two ends of described sampling resistor are connected to the input end of described sampling apparatus.
Above-mentioned internal resistance of cell proving installation, wherein: the two ends of described battery cell or electric battery are connected to the input end of described sampling apparatus.
Above-mentioned internal resistance of cell proving installation, wherein: be respectively equipped with capacitance between the positive and negative electrode of described battery cell or electric battery and the input end of described sampling apparatus.
The utility model internal resistance of cell proving installation, according to magnitude of voltage and the current value of gathering battery, the effective value of calculating voltage and electric current calculates power factor by controller according to above-mentioned magnitude of voltage and current value, and then draws the internal resistance of battery; The utility model has reduced the cost of PHEV by the internal resistance that few hardware and simple algorithm draw battery, has saved the space, has improved measuring accuracy and reliability simultaneously effectively.
Description of drawings
Fig. 1 is the utility model internal resistance of cell proving installation general structure block diagram;
Fig. 2 is the utility model internal resistance of cell proving installation concrete structure synoptic diagram.
Embodiment
Be that embodiment is described in further detail the utility model with a battery cell with reference to the accompanying drawings below:
According to Fig. 1 to Fig. 2, a kind of internal resistance of cell proving installation of the utility model comprises battery unit, and described battery unit constitutes the loop by driving source S and cell B1; Sampling apparatus, described sampling apparatus are used to gather the electric current of the voltage at battery two ends and flow through driving source and cell circuit; Controller, described controller is according to the current value of sampling apparatus output and the internal resistance of magnitude of voltage calculating cell or electric battery.Driving source in the described battery unit can output waveform be sinusoidal wave, the pumping signal of square wave or triangular wave, driving source provides the sinusoidal excitation source to battery cell in the present embodiment, be provided with sampling resistor R1 in the described battery unit, described sampling resistor R1 is positioned on the loop of driving source S and battery cell B1 formation, the two ends of described sampling resistor R1 are connected to the input end of described sampling apparatus and constitute first sampling channel, the two ends of described battery cell B1 are connected to the input end of described sampling apparatus and constitute second sampling channel, described battery cell just, be respectively equipped with the first capacitance C1 and the second capacitance C2 between the input end of negative pole and described sampling apparatus, described sampling apparatus is by the exciting current signal of the first sampling channel acquisition stream through sampling resistor R1, battery cell correspondent voltage signal enters sampling apparatus through second sampling channel of the first capacitance C1 and second capacitance C2 composition simultaneously, described sampling apparatus is through calculating current effective value and voltage effective value, described sampling apparatus is with the current instantaneous value of gathering, instantaneous voltage and the current effective value that calculates, voltage effective value is exported to described controller simultaneously, and described sampling apparatus is signals collecting chip commonly used such as ADE7763 etc.; Described controller starts integration, calculates active energy PE and apparent electric energy SE according to current effective value, voltage effective value and current instantaneous value, the instantaneous voltage imported, and active energy is
Wherein u, i are instantaneous voltage and electric current, the apparent electric energy is SE=Urms*Irms, wherein Urms and Irms are the effective value of voltage, electric current, θ=(Urms/Irms) * (PE/SE) draws the internal resistance of cell according to formula internal resistance of cell R=(Urms/Irms) * cos, described controller is preferably single-chip microcomputer, as adopting LPC2194 etc.
The utility model internal resistance of cell proving installation can also be measured the resistance of batteries in battery set monomer, between driving source and electric battery, switches set is set, make driving source form the loop with the battery cell of electric battery, harvester is gathered the voltage and the current in loop of battery cell in each loop, adopts the internal resistance of battery cell in the method counting cell group same as described above.
The embodiment of the above is a better embodiment of the present utility model; be not to limit concrete practical range of the present utility model with this, the equivalence variation that all shapes according to the utility model, structure are done all is included in the protection domain of the present utility model.
Claims (5)
1, a kind of internal resistance of cell proving installation is characterized in that:
Comprise battery unit, described battery unit constitutes the loop by driving source and battery cell or electric battery;
Sampling apparatus, described sampling apparatus are used to gather the electric current of the voltage at battery two ends and flow through driving source and cell circuit;
Controller, described controller is according to the current value of sampling apparatus output and the internal resistance of magnitude of voltage counting cell monomer or electric battery.
2, group proving installation in the battery according to claim 1, it is characterized in that: be provided with sampling resistor in the described battery unit, described sampling resistor is positioned at driving source and battery cell or electric battery and constitutes on the loop, and the two ends of described sampling resistor are connected to the input end of described sampling apparatus.
3, internal resistance of cell proving installation according to claim 2 is characterized in that: the two ends of described battery cell or electric battery are connected to the input end of described sampling apparatus.
4, internal resistance of cell proving installation according to claim 3 is characterized in that: be respectively equipped with capacitance between the positive and negative electrode of described battery cell or electric battery and the input end of described sampling apparatus.
5, internal resistance of cell proving installation according to claim 1, it is characterized in that: described controller is a single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201967864U CN201145709Y (en) | 2007-12-31 | 2007-12-31 | Apparatus for testing battery essential resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201967864U CN201145709Y (en) | 2007-12-31 | 2007-12-31 | Apparatus for testing battery essential resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201145709Y true CN201145709Y (en) | 2008-11-05 |
Family
ID=40082592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201967864U Expired - Lifetime CN201145709Y (en) | 2007-12-31 | 2007-12-31 | Apparatus for testing battery essential resistance |
Country Status (1)
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| CN (1) | CN201145709Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520255A (en) * | 2011-12-02 | 2012-06-27 | 惠州市亿能电子有限公司 | Direct current resistance measuring method for electric vehicle battery pack |
| CN104880605A (en) * | 2014-02-28 | 2015-09-02 | 比亚迪股份有限公司 | Battery management system and battery monomer DC internal resistance measuring method |
| CN105158573A (en) * | 2015-09-10 | 2015-12-16 | 北京动力源科技股份有限公司 | Battery internal resistance detection circuit and battery internal resistance detection method and apparatus |
| CN106932731A (en) * | 2017-05-05 | 2017-07-07 | 江苏金帆电源科技有限公司 | Method for detecting internal resistance of each storage battery in series storage battery pack |
| CN110888075A (en) * | 2019-12-23 | 2020-03-17 | 芜湖天量电池系统有限公司 | Measuring circuit and method for internal resistance of battery monomer in power battery box |
-
2007
- 2007-12-31 CN CNU2007201967864U patent/CN201145709Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520255A (en) * | 2011-12-02 | 2012-06-27 | 惠州市亿能电子有限公司 | Direct current resistance measuring method for electric vehicle battery pack |
| CN102520255B (en) * | 2011-12-02 | 2014-04-02 | 惠州市亿能电子有限公司 | Direct current resistance measuring method for electric vehicle battery pack |
| CN104880605A (en) * | 2014-02-28 | 2015-09-02 | 比亚迪股份有限公司 | Battery management system and battery monomer DC internal resistance measuring method |
| CN104880605B (en) * | 2014-02-28 | 2018-05-08 | 比亚迪股份有限公司 | The measuring method of the DC internal resistance of battery management system and battery cell |
| CN105158573A (en) * | 2015-09-10 | 2015-12-16 | 北京动力源科技股份有限公司 | Battery internal resistance detection circuit and battery internal resistance detection method and apparatus |
| CN105158573B (en) * | 2015-09-10 | 2018-09-14 | 北京动力源科技股份有限公司 | A kind of battery pack internal resistance detection circuit and battery pack internal resistance detection method and device |
| CN106932731A (en) * | 2017-05-05 | 2017-07-07 | 江苏金帆电源科技有限公司 | Method for detecting internal resistance of each storage battery in series storage battery pack |
| CN110888075A (en) * | 2019-12-23 | 2020-03-17 | 芜湖天量电池系统有限公司 | Measuring circuit and method for internal resistance of battery monomer in power battery box |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20081105 |