CN103515936A - Multi-stage current protection device for lithium-ion power battery discharging - Google Patents
Multi-stage current protection device for lithium-ion power battery discharging Download PDFInfo
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- CN103515936A CN103515936A CN201310476442.9A CN201310476442A CN103515936A CN 103515936 A CN103515936 A CN 103515936A CN 201310476442 A CN201310476442 A CN 201310476442A CN 103515936 A CN103515936 A CN 103515936A
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Abstract
The invention provides a multi-stage current protection device for lithium-ion power battery discharging. The multi-stage current protection device comprises a simulation front end, a sampling circuit which is connected with the simulation front end and used for sampling currents, a single chip microcomputer which is connected with the sampling circuit and the simulation front end respectively and used for processing the sampling currents to obtain overcurrent values and a switching circuit connected with the simulation front end. The single chip microcomputer controls the switching circuit to be disconnected for a certain time period according to the magnitude of the overcurrent values for overcurrent protection. The multi-stage current protection device for lithium-ion power battery discharging has the following advantages of saving energy and timely achieving protection.
Description
Technical field
The present invention relates to battery protection field, particularly a kind of lithium-ion-power cell multistage current protective device that discharges.
Background technology
At present, in the second protection of lithium-ion-power cell, used current protection technology.Current current protection technology does not also reach the requirement of energy-conservation and timely protection.Occurring when setting the more than 3 times electric current of protective current value; its guard time is consistent with setting guard time; so the protection loss of energy consumption is also 9 times of setting protective current value energy consumption; if computational methods that can I*I*R*t=P by formula can obtain current value, surpass 3 times, its power consumption loss value is to set 9 times of current value.Visible, its energy consumption is larger, can not reach function energy-conservation, timely protection.
Summary of the invention
The technical problem to be solved in the present invention is, can not reach the defect of the function of energy-conservation, timely protection for prior art above-mentioned, and a kind of lithium-ion-power cell with energy-conservation and timely defencive function multistage current protective device that discharges is provided.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of lithium-ion-power cell multistage current protective device that discharges, comprise AFE (analog front end), be connected with described AFE (analog front end) and for sample circuit that electric current is sampled, be connected with AFE (analog front end) with described sample circuit and sample rate current processed to the single-chip microcomputer that obtains overcurrent value and the switching circuit being connected with described AFE (analog front end) respectively; 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.
At lithium-ion-power cell of the present invention, discharge in multistage current protective device; described AFE (analog front end) comprises power device; described power device comprises charging valve and the discharge tube being connected with described charging valve, and the sampled point of described sample circuit is the node between described charging valve and discharge tube.
At lithium-ion-power cell of the present invention, discharge in multistage current protective device, the turn-off time of described switching circuit is relevant to the size of described overcurrent value.
At lithium-ion-power cell of the present invention, discharge in multistage current protective device, described sample circuit comprises the tenth metal-oxide-semiconductor.
At lithium-ion-power cell of the present invention, discharge in multistage current protective device, described sample circuit also comprises the 16 resistance, the 22 resistance, the 23 resistance, the 26 resistance and the 7th electric capacity; Described the 7th electric capacity is in parallel with the 16 resistance, and one end in parallel is connected with one end of the 26 resistance with one end of described the 22 resistance respectively, other end ground connection in parallel; The drain electrode of described the tenth metal-oxide-semiconductor is connected with the other end of described the 26 resistance, the grid of described the tenth metal-oxide-semiconductor is connected with the 9th pin of described single-chip microcomputer by described the 23 resistance, the source electrode of described the tenth metal-oxide-semiconductor connects described sampled point, and the other end of described the 22 resistance is connected with the tenth pin of described single-chip microcomputer.
At lithium-ion-power cell of the present invention, discharge in multistage current protective device, described sample circuit also comprises the first electric capacity of series connection successively, the second electric capacity, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity, also comprise the 8th metal-oxide-semiconductor, the 19 resistance and the 29 resistance, the source electrode of described the 8th metal-oxide-semiconductor is connected with one end of the 19 resistance with the negative pole of described the first electric capacity respectively, the grid of described the 8th metal-oxide-semiconductor is connected with one end of the 29 resistance with the other end of described the 19 resistance respectively, the other end of described the 29 resistance connects described AFE (analog front end), the drain electrode of described the 8th metal-oxide-semiconductor is connected with the source electrode of described the tenth metal-oxide-semiconductor.
At lithium-ion-power cell of the present invention, discharge in multistage current protective device; described switching circuit comprises the 9th metal-oxide-semiconductor and the 28 resistance; the drain electrode of described the 9th metal-oxide-semiconductor is connected with the drain electrode of described the 8th metal-oxide-semiconductor; the grid of described the 9th metal-oxide-semiconductor connects described AFE (analog front end) by described the 28 resistance, the source ground of described the 9th metal-oxide-semiconductor.
At lithium-ion-power cell of the present invention, discharge in multistage current protective device; sample rate current is carried out to filtering with described single-chip microcomputer and computing obtains actual current value, then actual current value and predefined current reference value is contrasted and obtains described overcurrent value.
At lithium-ion-power cell of the present invention, discharge in multistage current protective device, the conducting when described lithium-ion-power cell electric discharge of described the tenth metal-oxide-semiconductor.
Implement the lithium-ion-power cell of the present invention multistage current protective device that discharges; 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 is processed and is obtained overcurrent value sample rate current; single-chip microcomputer comes control switch circuit to cut out the corresponding time according to the size of overcurrent value to carry 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, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit theory diagrams that lithium-ion-power cell of the present invention discharges in embodiment of multistage current protective device;
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, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
At lithium-ion-power cell of the present invention, discharge in multistage current protective device embodiment, its lithium-ion-power cell discharge multistage current protective device circuit theory diagrams 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 electric current is sampled, single-chip microcomputer U2 is connected with AFE (analog front end) U3 and sample rate current is processed and obtained overcurrent value with sample circuit 03 respectively, and switching circuit is connected with AFE (analog front end) U3; Single-chip microcomputer U2 comes control switch circuit to close the corresponding time according to the size of overcurrent value to carry out overcurrent protection, and the turn-off time of switching circuit is relevant to the size of overcurrent value.Can realize electric current multi-stage protection 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 R the 16, the 22 resistance R the 22, the 23 resistance R the 23, the 26 resistance R 26 and the 7th capacitor C 7; The 7th capacitor C 7 is in parallel with the 16 resistance R 16, and one end in parallel is connected with the 26 resistance R 26 one end with the 22 resistance R 22 one end 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 R 26, the grid of the tenth metal-oxide-semiconductor Q10 is connected with the 9th pin of single-chip microcomputer U2 by the 23 resistance R 23, 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 R 22 is connected with the tenth pin of single-chip microcomputer U2.
In the present embodiment, sample circuit 03 also comprises the first capacitor C L1 of series connection successively, the second capacitor C L2, the 3rd capacitor C L3, the 4th capacitor C L4 and the 5th capacitor C L5, also comprise the 8th metal-oxide-semiconductor Q8, the 19 resistance R 19 and the 29 resistance R 29, the source electrode of the 8th metal-oxide-semiconductor Q8 is connected with the 19 resistance R 19 one end with the negative pole of the first capacitor C L1 respectively, the grid of the 8th metal-oxide-semiconductor Q8 is connected with the 29 resistance R 29 one end with the other end of the 19 resistance R 19 respectively, the other end connecting analog front end U3 of the 29 resistance R 29, 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 R 28, 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 is by the 28 resistance R 28 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, and power device comprises charging valve and the discharge tube being 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 uses in energy storage equipment movably, utilizes the internal resistance of power device itself to carry out current sample as sample resistance.Power device when electric discharge be by the nickel plating phosphorus bronze sheet of low internal resistance, by charging valve and discharge tube UNICOM, then gets node between charging valve and discharge tube as sampled point.By this current sample mode, in design, can reduce costs, also reduce the difficulty of cabling simultaneously.This mode can be convenient current value is got.In the present embodiment, due to what utilize, be that the internal resistance of power device is sampled, the discreteness of the internal resistance of power device itself is very large, and deviation is also large.Conventionally lower Rds=4m Ω, if the sampled voltage that electric current is its generation of 40A will be U=IR=40*0.004=160mV, as indivedual device R ds=2m Ω, sampled voltage will therefore reducing half only has 80mV.For this reason in multistage current protective device, can by power device internal resistance demarcate to make up the discreteness of device.
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; sample rate current is carried out to filtering to single-chip microcomputer U2 and computing obtains actual current value, then actual current value and predefined current reference value contrasted and obtain overcurrent value.For convenient, understand, by an expression formula, represent to be exactly Io=Ic – Ir, wherein Io is overcurrent value; Ic is actual current value; Ir is current reference value; After overcurrent value (Io) being calculated by software algorithm like this, the residing scope of judgement Io, finds corresponding guard time (current protection time) according to the scope of Io.That is to say, the scope of Io is different, and its corresponding guard time is also different.Reached like this multi-stage protection.Fig. 3 has only provided three-level protective, and first order protection is arranged on the protection of the 40A， second level and is arranged on 60A, and third level protection is arranged on 100A, and the application by design three-level protective point, can greatly reduce idle work, makes Energy Intensity Reduction 60%.In like manner, in above-mentioned same mode, after setting resolution, the lithium-ion-power cell multistage discharge prevention that discharges can be accomplished 3-6 level protection.By different settings, reach practical, protect the advantages such as rapid.Certainly, need as the case may be, can be expanded to more multi-stage protection.
In a word, in the present embodiment, by single-chip microcomputer U2, the power device of AFE (analog front end) U1 is controlled, under discharge condition, made the tenth metal-oxide-semiconductor Q10 conducting open over-current detection port (sampled point), make sample rate current signal enter single-chip microcomputer U2.Single-chip microcomputer U2 carries out filtering and computing by algorithm by sample rate current signal, and actual current value is calculated.By comparing with predefined current reference value, draw overcurrent value, then obtain overcurrent protection signal, this is that single-chip microcomputer U2 communicates by letter with AFE (analog front end) U3, and shutoff order is sent to AFE (analog front end) U3, then turn-offs the 9th metal-oxide-semiconductor Q9.Protective device features simple structure of the present invention, Protective levels is many, and data analysis is convenient, by single-chip microcomputer, is carried out advance preventing and is informed user, makes like this lithium-ion-power cell safer, reliable.Protective device of the present invention is effectively implemented protection at short notice, protect more in time, and energy consumption is lower, protects effect more humane, and its use is also more flexible, practical.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a lithium-ion-power cell multistage current protective device that discharges, it is characterized in that, comprise AFE (analog front end), be connected with described AFE (analog front end) and for sample circuit that electric current is sampled, be connected with AFE (analog front end) with described sample circuit and sample rate current processed to the single-chip microcomputer that obtains overcurrent value and the switching circuit being connected with described AFE (analog front end) respectively; 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.
2. the lithium-ion-power cell according to claim 1 multistage current protective device that discharges; it is characterized in that; described AFE (analog front end) comprises power device; described power device comprises charging valve and the discharge tube being connected with described charging valve, and the sampled point of described sample circuit is the node between described charging valve and discharge tube.
3. the lithium-ion-power cell according to claim 1 and 2 multistage current protective device that discharges, is characterized in that, the turn-off time of described switching circuit is relevant to the size of described overcurrent value.
4. the lithium-ion-power cell according to claim 3 multistage current protective device that discharges, is characterized in that, described sample circuit comprises the tenth metal-oxide-semiconductor.
5. the lithium-ion-power cell according to claim 4 multistage current protective device that discharges, is characterized in that, described sample circuit also comprises the 16 resistance, the 22 resistance, the 23 resistance, the 26 resistance and the 7th electric capacity; Described the 7th electric capacity is in parallel with the 16 resistance, and one end in parallel is connected with one end of the 26 resistance with one end of described the 22 resistance respectively, other end ground connection in parallel; The drain electrode of described the tenth metal-oxide-semiconductor is connected with the other end of described the 26 resistance, the grid of described the tenth metal-oxide-semiconductor is connected with the 9th pin of described single-chip microcomputer by described the 23 resistance, the source electrode of described the tenth metal-oxide-semiconductor connects described sampled point, and the other end of described the 22 resistance is connected with the tenth pin of described single-chip microcomputer.
6. the lithium-ion-power cell according to claim 5 multistage current protective device that discharges, it is characterized in that, described sample circuit also comprises the first electric capacity of series connection successively, the second electric capacity, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity, also comprise the 8th metal-oxide-semiconductor, the 19 resistance and the 29 resistance, the source electrode of described the 8th metal-oxide-semiconductor is connected with one end of the 19 resistance with the negative pole of described the first electric capacity respectively, the grid of described the 8th metal-oxide-semiconductor is connected with one end of the 29 resistance with the other end of described the 19 resistance respectively, the other end of described the 29 resistance connects described AFE (analog front end), the drain electrode of described the 8th metal-oxide-semiconductor is connected with the source electrode of described the tenth metal-oxide-semiconductor.
7. the lithium-ion-power cell according to claim 6 multistage current protective device that discharges; it is characterized in that; described switching circuit comprises the 9th metal-oxide-semiconductor and the 28 resistance; the drain electrode of described the 9th metal-oxide-semiconductor is connected with the drain electrode of described the 8th metal-oxide-semiconductor; the grid of described the 9th metal-oxide-semiconductor connects described AFE (analog front end) by described the 28 resistance, the source ground of described the 9th metal-oxide-semiconductor.
8. the lithium-ion-power cell according to claim 7 multistage current protective device that discharges; it is characterized in that; sample rate current is carried out to filtering with described single-chip microcomputer and computing obtains actual current value, then actual current value and predefined current reference value is contrasted and obtains described overcurrent value.
9. the lithium-ion-power cell according to claim 8 multistage current protective device that discharges, is characterized in that, the conducting when described lithium-ion-power cell electric discharge of described the tenth metal-oxide-semiconductor.
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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 |
| US20110133571A1 (en) * | 2009-04-09 | 2011-06-09 | Yoshikazu Kiyohara | Protection circuit and battery pack |
| CN102377170A (en) * | 2010-08-23 | 2012-03-14 | 三美电机株式会社 | Protection circuit |
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Patent Citations (4)
| 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 |
| US20110133571A1 (en) * | 2009-04-09 | 2011-06-09 | Yoshikazu Kiyohara | Protection circuit and battery pack |
| 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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