CN103515936B - A kind of lithium-ion-power cell electric discharge multi-stage current protection device - Google Patents
A kind of lithium-ion-power cell electric discharge multi-stage current protection device Download PDFInfo
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- CN103515936B CN103515936B CN201310476442.9A CN201310476442A CN103515936B CN 103515936 B CN103515936 B CN 103515936B CN 201310476442 A CN201310476442 A CN 201310476442A CN 103515936 B CN103515936 B CN 103515936B
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Abstract
The present invention proposes a kind of lithium-ion-power cell electric discharge multi-stage current protection device, comprise AFE (analog front end), be connected with described AFE (analog front end) and for electric current is sampled sample circuit, be connected with described sample circuit and AFE (analog front end) and sample rate current processed to the single-chip microcomputer obtaining overcurrent value respectively, and the switching circuit be connected with described AFE (analog front end); Described single-chip microcomputer controls described switching circuit according to the size of described overcurrent value and cuts out the corresponding time and carry out overcurrent protection.Implement lithium-ion-power cell of the present invention electric discharge multi-stage current protection device, there is following beneficial effect: there is energy-conservation and timely defencive function.
Description
Technical field
The present invention relates to battery protection field, particularly a kind of lithium-ion-power cell electric discharge multi-stage current protection device.
Background technology
At present, in the second protection of lithium-ion-power cell, use current protection technology.Current current protection technology does not also reach the requirement of energy-conservation and timely protection.When there is the electric current higher than setting protective current value more than 3 times; its guard time is consistent with setting guard time; therefore the protection loss of energy consumption is also 9 times of setting protective current value energy consumption; if the computational methods of I*I*R*t=P can obtain current value more than 3 times by formula, its power consumption loss value is 9 times of setting current value.Visible, its observable index is comparatively large, can not reach the function of energy-conservation, timely protection.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect that can not reach the function of energy-conservation, timely protection of prior art, provides a kind of lithium-ion-power cell electric discharge multi-stage current protection device with energy-conservation and timely defencive function.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of lithium-ion-power cell electric discharge multi-stage current protection device, comprise AFE (analog front end), be connected with described AFE (analog front end) and for electric current is sampled sample circuit, be connected with described sample circuit and AFE (analog front end) and sample rate current processed to the single-chip microcomputer obtaining overcurrent value respectively, and the switching circuit be connected with described AFE (analog front end); Described single-chip microcomputer controls described switching circuit according to the size of described overcurrent value and cuts out the corresponding time and carry out overcurrent protection.
In lithium-ion-power cell electric discharge multi-stage current protection device of the present invention; described AFE (analog front end) comprises power device; the discharge tube that described power device comprises charging valve and is connected with described charging valve, the sampled point of described sample circuit is the node between described charging valve and discharge tube.
In lithium-ion-power cell electric discharge multi-stage current protection device of the present invention, the turn-off time of described switching circuit is relevant to the size of described overcurrent value.
In lithium-ion-power cell electric discharge multi-stage current protection device of the present invention, described sample circuit comprises the tenth metal-oxide-semiconductor.
In lithium-ion-power cell electric discharge multi-stage current protection device of the present invention, described sample circuit also comprises the 16 resistance, the 22 resistance, the 23 resistance, the 26 resistance and the 7th electric capacity; Described 7th electric capacity and the 16 resistor coupled in parallel, one end in parallel is connected with described one end of 22 resistance and one end of the 26 resistance respectively, other end ground connection in parallel; The drain electrode of described tenth metal-oxide-semiconductor is connected with the other end of described 26 resistance, the grid of described tenth metal-oxide-semiconductor is connected with the 9th pin of described single-chip microcomputer by described 23 resistance, the source electrode of described tenth metal-oxide-semiconductor connects described sampled point, and the other end of described 22 resistance is connected with the tenth pin of described single-chip microcomputer.
In lithium-ion-power cell electric discharge multi-stage current protection device of the present invention, described sample circuit also comprises first electric capacity of connecting successively, second electric capacity, 3rd electric capacity, 4th electric capacity and the 5th electric capacity, also comprise the 8th metal-oxide-semiconductor, 19 resistance and the 29 resistance, the source electrode of described 8th metal-oxide-semiconductor is connected with the negative pole of described first electric capacity and one end of the 19 resistance respectively, the grid of described 8th metal-oxide-semiconductor is connected with the described other end of the 19 resistance and one end of the 29 resistance respectively, the other end of described 29 resistance connects described AFE (analog front end), the drain electrode of described 8th metal-oxide-semiconductor is connected with the source electrode of described tenth metal-oxide-semiconductor.
In lithium-ion-power cell electric discharge multi-stage current protection device of the present invention; described switching circuit comprises the 9th metal-oxide-semiconductor and the 28 resistance; the drain electrode of described 9th metal-oxide-semiconductor is connected with the drain electrode of described 8th metal-oxide-semiconductor; the grid of described 9th metal-oxide-semiconductor connects described AFE (analog front end) by described 28 resistance, the source ground of described 9th metal-oxide-semiconductor.
In lithium-ion-power cell electric discharge multi-stage current protection device of the present invention; described single-chip microcomputer carries out filtering to sample rate current and computing obtains actual current value, then actual current value is carried out contrast with the current reference value preset and obtains described overcurrent value.
In lithium-ion-power cell electric discharge multi-stage current protection device of the present invention, the conducting when described lithium-ion-power cell electric discharge of described tenth metal-oxide-semiconductor.
Implement lithium-ion-power cell of the present invention electric discharge multi-stage current protection device; there is following beneficial effect: owing to using AFE (analog front end), sample circuit, switching circuit and single-chip microcomputer; sample circuit is sampled to electric current; single-chip microcomputer carries out process to sample rate current and obtains overcurrent value; the size of single-chip microcomputer foundation overcurrent value is carried out the control switch circuit closedown corresponding time and is carried out overcurrent protection; so just can realize multistage current protection, so it has energy-conservation and timely defencive function.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams in lithium-ion-power cell of the present invention electric discharge multi-stage current protection device embodiment;
Fig. 2 is the position view of sampled point in power device in described embodiment;
Fig. 3 is the coordinate schematic diagram of electric current multi-stage protection in described embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In lithium-ion-power cell electric discharge multi-stage current protection device embodiment of the present invention, the circuit theory diagrams of its lithium-ion-power cell electric discharge multi-stage current protection device as shown in Figure 1.In Fig. 1, this protective device comprises AFE (analog front end) U3, sample circuit 03, single-chip microcomputer U2 and switching circuit; Wherein, sample circuit 03 is connected with AFE (analog front end) U3 and for sampling to electric current, and single-chip microcomputer U2 is connected with sample circuit 03 and AFE (analog front end) U3 respectively and carries out process to sample rate current and obtains overcurrent value, and switching circuit is connected with AFE (analog front end) U3; The size of single-chip microcomputer U2 foundation overcurrent value is carried out the control switch circuit closedown corresponding time and is carried out overcurrent protection, and the turn-off time of switching circuit is relevant to the size of overcurrent value.Electric current multi-stage protection can be realized like this, so it has energy-conservation and timely defencive function.
In the present embodiment, sample circuit 03 comprises the tenth metal-oxide-semiconductor Q10, the tenth metal-oxide-semiconductor Q10 conducting when lithium-ion-power cell discharges.Sample circuit 03 also comprises the 16 resistance R16, the 22 resistance R22, the 23 resistance R23, the 26 resistance R26 and the 7th electric capacity C7; 7th electric capacity C7 is in parallel with the 16 resistance R16, and one end in parallel is connected with one end of the 22 resistance R22 and one end of the 26 resistance R26 respectively, other end ground connection in parallel; The drain electrode of the tenth metal-oxide-semiconductor Q10 is connected with the other end of the 26 resistance R26, the grid of the tenth metal-oxide-semiconductor Q10 is connected with the 9th pin of single-chip microcomputer U2 by the 23 resistance R23, the source electrode of the tenth metal-oxide-semiconductor Q10 connects sampled point B(as shown in Figure 2), the other end of the 22 resistance R22 is connected with the tenth pin of single-chip microcomputer U2.
In the present embodiment, sample circuit 03 also comprises the first electric capacity CL1 connected successively, second electric capacity CL2, 3rd electric capacity CL3, 4th electric capacity CL4 and the 5th electric capacity CL5, also comprise the 8th metal-oxide-semiconductor Q8, 19 resistance R19 and the 29 resistance R29, the source electrode of the 8th metal-oxide-semiconductor Q8 is connected with the negative pole of the first electric capacity CL1 and one end of the 19 resistance R19 respectively, the grid of the 8th metal-oxide-semiconductor Q8 is connected with the other end of the 19 resistance R19 and one end of the 29 resistance R29 respectively, the other end connecting analog front end U3 of the 29 resistance R29, the drain electrode of the 8th metal-oxide-semiconductor Q8 is connected with the source electrode of the tenth metal-oxide-semiconductor Q10.
In the present embodiment, switching circuit comprises the 9th metal-oxide-semiconductor Q9 and the 28 resistance R28, the drain electrode of the 9th metal-oxide-semiconductor Q9 is connected with the drain electrode of the 8th metal-oxide-semiconductor Q8, and the grid of the 9th metal-oxide-semiconductor Q9 passes through the 28 resistance R28 connecting analog front end U3, the source ground of the 9th metal-oxide-semiconductor Q9.
In the present embodiment, AFE (analog front end) U3 comprises power device, Fig. 2 is the position view of sampled point in power device, in Fig. 2, B is sampled point, I is the sense of current, the discharge tube that power device comprises charging valve and is connected with charging valve, and the sampled point of sample circuit 03 is the node between charging valve and discharge tube.
Concrete, protective device of the present invention is used in moveable energy storage equipment, utilizes the internal resistance of power device itself to carry out current sample as sample resistance.By the nickel plating phosphorus bronze sheet of low internal resistance during power device electric discharge, by charging valve and discharge tube UNICOM, then get node between charging valve and discharge tube as sampled point.By this current sample mode, can reduce costs in the design, also reduce the difficulty of cabling simultaneously.This mode can be convenient current value is got.Be that the internal resistance of power device is sampled due to what utilize in the present embodiment, the discreteness of the internal resistance of power device itself is very large, and deviation is also large.Usually lower Rds=4m Ω, if electric current is 40A, its sampled voltage produced will be U=IR=40*0.004=160mV, and as particular device Rds=2m Ω, therefore sampled voltage will reduce half and only have 80mV.For this reason in multi-stage current protection device, by demarcating the discreteness making up device to power device internal resistance.
Fig. 3 is the coordinate schematic diagram of electric current multi-stage protection in the present embodiment; abscissa is guard time; ordinate is overcurrent value; also with regard to protective current; single-chip microcomputer U2 carries out filtering to sample rate current and computing obtains actual current value, then actual current value is carried out contrast with the current reference value preset and obtains overcurrent value.Conveniently understand, represent to be exactly Io=Ic – Ir by an expression formula, wherein Io is overcurrent value; Ic is actual current value; Ir is current reference value; After being calculated by overcurrent value (Io) by software algorithm like this, judge the scope residing for Io, find corresponding guard time (current protection time) according to the scope of Io.That is, the scope of Io is different, and the guard time of its correspondence is also different.Reach multi-stage protection like this.Fig. 3 only gives three-level protective, and first order protection setting is at 40A, and second level protection setting is at 60A, and third level protection setting, at 100A, by the application of design three-level protective point, can greatly reduce idle work, makes energy consumption reduce by 60%.In like manner, in above-mentioned same mode, after setting resolution, the lithium-ion-power cell multistage discharge prevention that discharges can accomplish that 3-6 level is protected.By different settings, reach practical, protect the advantages such as rapid.Certainly, need as the case may be, more multi-stage protection can be expanded to.
In a word, in the present embodiment, by single-chip microcomputer U2, the power device of AFE (analog front end) U1 is controlled, in the discharged condition, make the tenth metal-oxide-semiconductor Q10 conducting to open overcurrent detection port (sampled point), make sampled current signals enter single-chip microcomputer U2.Sampled current signals is carried out filtering and computing by algorithm by single-chip microcomputer U2, actual current value is calculated.By comparing with the current reference value preset, drawing overcurrent value, then obtaining overcurrent protection signal, this is that single-chip microcomputer U2 communicates with AFE (analog front end) U3, and AFE (analog front end) U3 is sent in shutoff order, then turns off the 9th metal-oxide-semiconductor Q9.Protective device features simple structure of the present invention, Protective levels is many, and data analysis is convenient, carries out advance preventing and informs user, make lithium-ion-power cell safer, reliable like this by single-chip microcomputer.Protection effectively implemented at short notice by protective device of the present invention, and protection is more timely, and energy consumption is lower, and protected effect is more humane, and its use is also more flexible, practical.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a lithium-ion-power cell electric discharge multi-stage current protection device, it is characterized in that, comprise AFE (analog front end), be connected with described AFE (analog front end) and for electric current is sampled sample circuit, be connected with described sample circuit and AFE (analog front end) and sample rate current processed to the single-chip microcomputer obtaining overcurrent value respectively, and the switching circuit be connected with described AFE (analog front end); Described single-chip microcomputer controls described switching circuit according to the size of described overcurrent value and cuts out the corresponding time and carry out overcurrent protection, the turn-off time of described switching circuit is relevant to the size of described overcurrent value, described sample circuit comprises the tenth metal-oxide-semiconductor, and described sample circuit also comprises the 16 resistance, the 22 resistance, the 23 resistance, the 26 resistance and the 7th electric capacity; Described 7th electric capacity and the 16 resistor coupled in parallel, one end in parallel is connected with described one end of 22 resistance and one end of the 26 resistance respectively, other end ground connection in parallel; The drain electrode of described tenth metal-oxide-semiconductor is connected with the other end of described 26 resistance, the grid of described tenth metal-oxide-semiconductor is connected with the 9th pin of described single-chip microcomputer by described 23 resistance, the source electrode of described tenth metal-oxide-semiconductor connects described sampled point, and the other end of described 22 resistance is connected with the tenth pin of described single-chip microcomputer.
2. lithium-ion-power cell electric discharge multi-stage current protection device according to claim 1; it is characterized in that; described AFE (analog front end) comprises power device; the discharge tube that described power device comprises charging valve and is connected with described charging valve, the sampled point of described sample circuit is the node between described charging valve and discharge tube.
3. lithium-ion-power cell electric discharge multi-stage current protection device according to claim 2, it is characterized in that, described sample circuit also comprises first electric capacity of connecting successively, second electric capacity, 3rd electric capacity, 4th electric capacity and the 5th electric capacity, also comprise the 8th metal-oxide-semiconductor, 19 resistance and the 29 resistance, the source electrode of described 8th metal-oxide-semiconductor is connected with the negative pole of described first electric capacity and one end of the 19 resistance respectively, the grid of described 8th metal-oxide-semiconductor is connected with the described other end of the 19 resistance and one end of the 29 resistance respectively, the other end of described 29 resistance connects described AFE (analog front end), the drain electrode of described 8th metal-oxide-semiconductor is connected with the source electrode of described tenth metal-oxide-semiconductor.
4. lithium-ion-power cell electric discharge multi-stage current protection device according to claim 3; it is characterized in that; described switching circuit comprises the 9th metal-oxide-semiconductor and the 28 resistance; the drain electrode of described 9th metal-oxide-semiconductor is connected with the drain electrode of described 8th metal-oxide-semiconductor; the grid of described 9th metal-oxide-semiconductor connects described AFE (analog front end) by described 28 resistance, the source ground of described 9th metal-oxide-semiconductor.
5. lithium-ion-power cell electric discharge multi-stage current protection device according to claim 4; it is characterized in that; described single-chip microcomputer carries out filtering to sample rate current and computing obtains actual current value, then actual current value is carried out contrast with the current reference value preset and obtains described overcurrent value.
6. lithium-ion-power cell electric discharge multi-stage current protection device according to claim 5, is characterized in that, the conducting when described lithium-ion-power cell electric discharge of described tenth metal-oxide-semiconductor.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101567475A (en) * | 2008-04-22 | 2009-10-28 | 天津泛海科技有限公司 | Lithium battery/battery pack measuring and protecting method based on current subsection detecting technique |
| CN102005730A (en) * | 2010-11-11 | 2011-04-06 | 陈会甫 | Overload protection device and method for electric tool |
| CN102377170A (en) * | 2010-08-23 | 2012-03-14 | 三美电机株式会社 | Protection circuit |
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| JP5208149B2 (en) * | 2009-04-09 | 2013-06-12 | パナソニック株式会社 | Protection circuit and battery pack |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567475A (en) * | 2008-04-22 | 2009-10-28 | 天津泛海科技有限公司 | Lithium battery/battery pack measuring and protecting method based on current subsection detecting technique |
| CN102377170A (en) * | 2010-08-23 | 2012-03-14 | 三美电机株式会社 | Protection circuit |
| CN102005730A (en) * | 2010-11-11 | 2011-04-06 | 陈会甫 | Overload protection device and method for electric tool |
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