CN205450222U - Test circuit of DC internal resistance - Google Patents
Test circuit of DC internal resistance Download PDFInfo
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- CN205450222U CN205450222U CN201521115964.7U CN201521115964U CN205450222U CN 205450222 U CN205450222 U CN 205450222U CN 201521115964 U CN201521115964 U CN 201521115964U CN 205450222 U CN205450222 U CN 205450222U
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- internal resistance
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Abstract
The utility model discloses a test circuit of DC internal resistance, test circuit include voltage acquisition circuit, group battery, current regulation circuit, total positive relay and always bear the relay, voltage acquisition circuit is connected with the group battery, gathers the voltage of group battery, assemble positive relay and always bear the both ends that the relay was connected to the group battery respectively, current regulation circuit is parallelly connected with the group battery, and current regulation circuit connects at total positive relay and always bears between the relay. The utility model discloses a discharge rate can control, through discharge what of resistance quantity in the return circuit of controlled access, controls discharge rate's size, in addition, the utility model discloses a circuit does not need the outside equipment such as electric pile that fills, can be in order to realize through BMS self.
Description
Technical field
This utility model relates to the technical field of electric automobile, more specifically, relates to the test circuit of a kind of DC internal resistance.
Background technology
Electric automobile power battery group is made up of string lithium ion cells up to a hundred, between lithium ion single battery concordance for, serviceability and the life-span of electric automobile are most important.Existing battery management system with sampling battery monomer voltage, but can not control the size of the discharge current of battery, and the internal resistance so calculated does not has certain canonical reference.For the measuring method of electric automobile internal resistance, mainly by the following two kinds:
The first is direct-current discharge internal resistance measurement method, and its advantage is that certainty of measurement is the highest, control proper if can reach 0.1%.But its shortcoming is (1) can only measure high capacity cell, small-capacity cells cannot provide 40～80A electric currents in 3s；(2) big electric current is by battery meeting lesion electrode, shortens battery life.Run counter to measurement original intention；(3) measuring apparatus expensive, volume is big.
The second is ac-excited method, and its advantage is that (1) can measure all batteries, including small-capacity cells；(2) measure process and battery will not be produced infringement；(3) being of relatively low cost, volume is little.But its shortcoming is that (1) ratio of precision direct current method is low, but can meet application requirement；(2) alternating current method certainty of measurement is likely to be affected and harmonic wave current interference by ripple current, and equipment circuit capacity of resisting disturbance is required height；(3) need to introduce external communication driving source, add complexity and the circuit cost of circuit.
Utility model content
The purpose of this utility model is to overcome drawbacks described above of the prior art, it is provided that the test circuit of a kind of DC internal resistance, it is achieved discharge-rate is controlled and without equipment such as outside charging piles.
For achieving the above object, the technical scheme that this utility model provides is as follows:
This utility model provides the test circuit of a kind of DC internal resistance, and this circuit includes voltage collection circuit, set of cells, current regulating circuit, total positive relay and always bears relay；Described voltage collection circuit is connected with set of cells, gather the voltage of set of cells, described total positive relay and total negative relay are respectively connecting to the two ends of set of cells, and described current regulating circuit is in parallel with set of cells, and current regulating circuit is connected between total positive relay and total negative relay.
As preferred technical scheme, described set of cells is by mpIndividual cell composition parallel branch, then by msIndividual parallel branch is connected in series, wherein mp、msIt is the integer not less than 1.
As preferred technical scheme, described current regulating circuit includes the many groups of resistance selection circuit being connected in parallel, and described resistance selection circuit includes resistance and the switch being connected in series, and when switch Guan Bi, the resistance connected with this switch is access in discharge loop.
As preferred technical scheme, described resistance is high-power aluminum casing resistor.
As preferred technical scheme, described voltage collection circuit is made up of special lithium ion battery many strings sampling A/D chip, the magnitude of voltage of real-time sampling battery.
Compared with prior art, the beneficial effects of the utility model are:
1, discharge-rate of the present utility model can control, by control to access resistance quantity in discharge loop number, control the size of discharge-rate, it addition, circuit of the present utility model need not the equipment such as the charging pile of outside, i.e. can be realized by BMS self.
2, this utility model resistance low cost, control mode is simple, easily realizes, can be selected for high-power aluminum casing resistor (certain other kinds of resistance meets the technical solution of the utility model equally), it is achieved the test to DC internal resistance.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams of the test circuit of the DC internal resistance that this utility model embodiment provides.
Detailed description of the invention
For making the purpose of this utility model embodiment, technical scheme and advantage clearer, below in conjunction with the accompanying drawing in this utility model embodiment, technical scheme in this utility model embodiment is clearly and completely described, obviously, described embodiment is a part of embodiment of this utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
Embodiment
Embodiment of the present utility model provides the test circuit of DC internal resistance, Fig. 1 is the circuit theory diagrams of this utility model embodiment, refer to Fig. 1, this circuit of the circuit of this utility model embodiment includes voltage collection circuit, set of cells, current regulating circuit, total positive relay and always bears relay；Described voltage collection circuit is connected with set of cells, gather the voltage of set of cells, described total positive relay and total negative relay are respectively connecting to the two ends of set of cells, and described current regulating circuit is in parallel with set of cells, and current regulating circuit is connected between total positive relay and total negative relay.
In the present embodiment, described set of cells is by mpIndividual cell composition parallel branch, then by msIndividual parallel branch is connected in series, wherein mp、msIt is the integer not less than 1..
Described current regulating circuit includes the many groups of resistance selection circuit being connected in parallel, and described resistance selection circuit includes resistance and the switch being connected in series, when switch Guan Bi, the resistance connected with this switch is access in discharge loop, as it is shown in figure 1, arrange Guan Bi K1, it is 1C by the electric current of R1；Guan Bi K2, is 2C by the electric current of R2；Guan Bi K3, is 3C by the electric current of R3；Guan Bi K4, is 4C by the electric current of R4, can realize the discharge current regulation at 1C-10C by the combination of resistance.
Described resistance is high-power aluminum casing resistor, uses high-power aluminum casing resistor can reduce manufacturing cost, beneficially large-scale industrial production.
Described voltage collection circuit is made up of special lithium ion battery many strings sampling A/D chip, the magnitude of voltage of real-time sampling battery.
The present embodiment test circuit carries out the test of DC internal resistance by following concrete mode:
(1), before the DC internal resistance of test set of cells, D.C. resistance to be detected is stood a period of time；In the present embodiment, it is more than 1H for D.C. resistance time of repose to be detected, to ensure that set of cells reaches steady statue；
(2) set of cells, is set by mpIndividual cell composition parallel branch, then by msIndividual parallel branch is connected in series, wherein mp、msIt is the integer not less than 1, the n-th parallel branch m in set of cellsnRunning voltage, be expressed as follows:
vn(t)=OCV (sn(t))-Rin(t)；
Wherein, vnT () represents the n-th parallel branch m in set of cellsnRunning voltage；
snT () represents the n-th parallel branch m in set of cellsnCurrent SOC state；
OCV(sn(t)) represent the n-th parallel branch m in set of cellsnThe open-circuit voltage of current SOC state；
inT () represents the n-th parallel branch m in set of cellsnDischarge current；
R represents the n-th parallel branch m in set of cellsnElectric discharge DC internal resistance；
(3), calculating direct-current discharge internal resistance, computing formula is as follows:
After above-mentioned test, it is 10% at SOC respectively to DC internal resistance, tests in the case of 20%......100%, the DC internal resistance in the case of the different SOC of test.
In step (2), described SOC, OCV (sn(t))、in(t) and vnT the actual value of () is provided by BMS sample circuit；The number in parallel accessing resistance by controlling relay of discharge current size realizes.
In step (2), the n-th parallel branch m in set of cellsnDischarge current inT the size of () accesses the number in parallel of resistance and is adjusted by controlling relay.
In the present embodiment, cell is within the short cycle, and internal resistance variable quantity is not very big, and therefore the calculating cycle for the internal resistance of cell can control carrying out one-shot measurement every two weeks.
Above-described embodiment is this utility model preferably embodiment; but embodiment of the present utility model is also not restricted to the described embodiments; other any without departing from the change made under spirit of the present utility model and principle, modify, substitute, combine, simplify; all should be the substitute mode of equivalence, within being included in protection domain of the present utility model.
Claims (5)
1. the test circuit of a DC internal resistance, it is characterised in that this circuit includes voltage collection circuit, set of cells, current regulating circuit, total positive relay and always bears relay；Described voltage collection circuit is connected with set of cells, gather the voltage of set of cells, described total positive relay and total negative relay are respectively connecting to the two ends of set of cells, and described current regulating circuit is in parallel with set of cells, and current regulating circuit is connected between total positive relay and total negative relay.
The test circuit of DC internal resistance the most according to claim 1, it is characterised in that described set of cells is by mpIndividual cell composition parallel branch, then by msIndividual parallel branch is connected in series, wherein mp、msIt is the integer not less than 1.
The test circuit of DC internal resistance the most according to claim 1, it is characterized in that, described current regulating circuit includes the many groups of resistance selection circuit being connected in parallel, described resistance selection circuit includes resistance and the switch being connected in series, when switch Guan Bi, the resistance connected with this switch is access in discharge loop.
The test circuit of DC internal resistance the most according to claim 3, it is characterised in that described resistance is high-power aluminum casing resistor.
The test circuit of DC internal resistance the most according to claim 1, it is characterised in that described voltage collection circuit is made up of special lithium ion battery many strings sampling A/D chip, the magnitude of voltage of real-time sampling battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521115964.7U CN205450222U (en) | 2015-12-26 | 2015-12-26 | Test circuit of DC internal resistance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521115964.7U CN205450222U (en) | 2015-12-26 | 2015-12-26 | Test circuit of DC internal resistance |
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| Publication Number | Publication Date |
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| CN205450222U true CN205450222U (en) | 2016-08-10 |
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| CN201521115964.7U Active CN205450222U (en) | 2015-12-26 | 2015-12-26 | Test circuit of DC internal resistance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738816A (en) * | 2015-12-26 | 2016-07-06 | 惠州市蓝微新源技术有限公司 | DC inner resistance test circuit and test method |
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2015
- 2015-12-26 CN CN201521115964.7U patent/CN205450222U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738816A (en) * | 2015-12-26 | 2016-07-06 | 惠州市蓝微新源技术有限公司 | DC inner resistance test circuit and test method |
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