CN103033753A - Method of quickly judging hopower maintaining rate (SOC) of lithium iron phosphate battery (pack) - Google Patents
Method of quickly judging hopower maintaining rate (SOC) of lithium iron phosphate battery (pack) Download PDFInfo
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- CN103033753A CN103033753A CN2011103017443A CN201110301744A CN103033753A CN 103033753 A CN103033753 A CN 103033753A CN 2011103017443 A CN2011103017443 A CN 2011103017443A CN 201110301744 A CN201110301744 A CN 201110301744A CN 103033753 A CN103033753 A CN 103033753A
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Abstract
The invention discloses a method of quickly judging the hopower maintaining rate (SOC) of a lithium iron phosphate battery (pack). The method is realized by connecting a control circuit on a lithium iron phosphate battery (pack) external circuit. An input circuit and an output circuit are included. The input circuit comprises a current amplifier, an analog-digital converter, and a single chip microcomputer. The output circuit comprises a relay, a lithium manganate battery, a load, a power management integrated circuit (IC), and a switch. When the lithium iron phosphate battery (pack) charges or discharges, the input circuit automatically analyzes current strength of the phosphate iron lithium battery (pack) and sends out instructions to order the relay in the output circuit to close, the lithium manganate battery also charges (discharges) at a designated current strength, and carrying capacity of the lithium manganate battery forms linear correlativity with the carrying capacity of the lithium iron phosphate battery (pack), thus, the SOC of lithium iron phosphate battery (pack) can be quickly judged through detection of SOC of lithium manganate battery. The method consumes little time, and is accurate and quick in judgments, and convenient to operate.
Description
Technical field
The present invention relates to electrochemical field, relate in particular to the method for a kind of quick judgement ferric phosphate lithium cell (group) SoC.
Background technology
In recent years, because the climate warming problem that energy crisis, especially greenhouse gas emission cause uses the eco-friendly power source of low emission to become an urgent demand.Therefore, the development and utilization of the clean energy resource such as sun power, wind energy has obtained significant progress.Yet sun power, wind power generation etc. all is the unsettled energy, realizes that the prerequisite of generating electricity by way of merging two or more grid systems is the problem that solves energy storage; And electric automobile low because discharging (or zero-emission), the higher advantages such as energy conversion efficiency, its research and application have obtained huge progress, lithium ion battery is owing to have the operating voltage height, specific energy density is large, have extended cycle life, self-discharge rate is low, the advantages such as memory-less effect and environmental pollution are little, at first at mobile communication equipment, the fields such as mobile electronic device have obtained huge success, at present to large-scale energy storage device, the expansion of electric automobile field, the new forms of energy strategy in the global range provides a unprecedented platform for the development of power lithium-ion battery.
LiFePO4 has long circulation life, high security and higher theoretical electrochemistry capacity and becomes the desirable positive electrode of used for electric vehicle lithium ion battery, energy-storage battery.Therefore, ferric phosphate lithium cell (group) has been widely used on energy-storage battery, the electrokinetic cell.Electrokinetic cell, energy-storage battery are in use, obtain accurate state-of-charge, can effectively avoid overcharging, overdischarge etc. is to the destructive procedure of battery, extending battery life, this monitors the charged conservation rate (SoC) of battery at any time with regard to needing, to guarantee the electric battery safe operation.Yet state-of-charge is the parameter of not directly measuring, and can only estimate it by electric current, voltage, temperature and other retrievable battery information.Because there is obvious phase transformation interface in LiFePO4 in charge and discharge process, therefore, the voltage platform that always can occur growing very much in ferric phosphate lithium cell (group) charge and discharge process is so that the estimation of the charged conservation rate of ferric phosphate lithium cell (group) becomes extremely difficult.
At present, obtain the simplest way of SoC and be exactly completely discharge test, but this is a kind of method of off-line, expends the plenty of time and can change the degree of aging of battery.That uses at present has ampere-hour coulometry, circuit model method, internal resistance measurement method, Kalman filtering method etc. at line method, and these methods not only complexity but also error are very large.Therefore, be badly in need of a kind of SoC method that can quick and precisely judge ferric phosphate lithium cell (group) of development.
The present invention is by connecting to form circuit with ferric phosphate lithium cell (group) and particular electronic component, adjusting by specific electronic component, the electric current of flowing through in the ferric phosphate lithium cell (group) is changed into electric current in the LiMn2O4 circuit, by the detection to the SoC of lithium manganate battery, realization judges fast that to the SoC of ferric phosphate lithium cell (group) it is few to expend time in, accuracy of judgement, quick, handled easily, on battery without any impact.
Summary of the invention
The object of the present invention is to provide the method for the charged conservation rate of a kind of quick judgement ferric phosphate lithium cell (group) (SoC), realize by connecting a control circuit circuit in electric battery, comprise input circuit and output circuit;
Described input circuit comprises ferric phosphate lithium cell group, current amplifier, analog to digital converter, single-chip microcomputer, wherein, the ferric phosphate lithium cell group is electrically connected with current amplifier, and current amplifier is electrically connected with analog to digital converter, analog to digital converter is electrically connected with single-chip microcomputer, consists of an input circuit;
Described output circuit comprises relay, lithium manganate battery, load, managing electric quantity IC, switch, wherein, the single-chip microcomputer of described input circuit is electrically connected with relay, relay is electrically connected with load, load is electrically connected with switch, switch is electrically connected with lithium manganate battery, and lithium manganate battery is electrically connected with managing electric quantity IC, consists of an output loop; Concrete grammar is:
When described ferric phosphate lithium cell (group) discharges, its strength of current of input circuit automatic analysis is also sent instruction, relay closes in the order output circuit, lithium manganate battery is also with certain strength of current discharge, detect the SoC of lithium manganate battery by managing electric quantity IC, according to the linear dependence relation of the carrying capacity of the carrying capacity of lithium manganate battery and ferric phosphate lithium cell (group), can draw the SoC of ferric phosphate lithium cell (group);
When described ferric phosphate lithium cell (group) charges, its strength of current of input circuit automatic analysis is also sent instruction, relay closes in the order output circuit, lithium manganate battery is also with certain strength of current charging, detect the SoC of lithium manganate battery by managing electric quantity IC, according to the linear dependence relation of the carrying capacity of the carrying capacity of lithium manganate battery and ferric phosphate lithium cell (group), can draw the SoC of ferric phosphate lithium cell (group).
Alternatively, the method of described ferric phosphate lithium cell (group) SoC, described single-chip microcomputer can be regulated automatically according to the electric capacity of ferric phosphate lithium cell group and the capacitance value of lithium manganate battery when work, so that the electric capacity of ferric phosphate lithium cell group equals the integral multiple of the electric capacity of lithium manganate battery.
Alternatively, the method of ferric phosphate lithium cell according to claim 1 (group) SoC, the carrying capacity of described lithium manganate battery closes with the linear dependence of the carrying capacity of ferric phosphate lithium cell (group): the charged conservation rate when the charged conservation rate when ferric phosphate lithium cell (group) fills (putting) electricity fills (putting) electricity with lithium manganate battery equates, the charged conservation rate of ferric phosphate lithium cell group in the time of directly can reading discharge among the managing electric quantity IC from controlled circuit.
In sum, the invention has the beneficial effects as follows, the method that has overcome this off-line of discharge test expends the plenty of time and can change the degree of aging of battery, with present in line method complicated operation, shortcoming that error is large, provide a kind of expending time in to lack, accuracy of judgement, quick, handled easily is on the determination methods of battery without any impact.
Description of drawings
Fig. 1 is control circuit synoptic diagram of the present invention, and wherein Fig. 1-1 is input circuit, and Fig. 1-2 is output circuit.
Embodiment
Embodiment 1:
As shown in Figure 1, the 1st, ferric phosphate lithium cell group, the 2nd, current amplifier, the 3rd, analog to digital converter, the 4th, single-chip microcomputer, the 5th, relay, the 6th, load, the 7th, switch, the 8th, lithium manganate battery, the 9th, managing electric quantity IC; The method of a kind of quick judgement ferric phosphate lithium cell of the present invention (group) SoC realizes by connecting a control circuit in electric battery, comprises input circuit and output circuit;
Described input circuit comprises ferric phosphate lithium cell group 1, current amplifier 2, analog to digital converter 3, single-chip microcomputer 4; Described output circuit comprises relay 5, lithium manganate battery 8, load 6, managing electric quantity IC 9, switch 7;
Wherein, the effect of current amplifier and analog to digital converter is the total current in the analysis controling circuit, and is converted into digital signal, and with digital signal transfers to single-chip microcomputer; The effect of single-chip microcomputer is that digital signal is analyzed judgement, and send instruction, make output circuit pass through with certain electric current, and single-chip microcomputer can be regulated automatically according to the electric capacity of ferric phosphate lithium cell group and the capacitance value of lithium manganate battery when work, so that the electric capacity of ferric phosphate lithium cell group equals the integral multiple of the electric capacity of lithium manganate battery.The effect of relay is control output circuit work or rest; The effect of managing electric quantity IC is the charged conservation rate that detects lithium manganate battery.
Physical circuit is connected to: one group of ferric phosphate lithium cell (k cell) is connected by certain mode, and the capacity of electric battery is C
F, the ferric phosphate lithium cell group is electrically connected with current amplifier, and current amplifier is electrically connected with analog to digital converter, and analog to digital converter is electrically connected with single-chip microcomputer, consists of an input circuit; The single-chip microcomputer of described input circuit is electrically connected with relay, and relay is electrically connected with load, and load is electrically connected with switch, and switch is electrically connected with lithium manganate battery, and lithium manganate battery is electrically connected with managing electric quantity IC, consists of an output loop; Input circuit is by the discharging and recharging of lithium manganate battery in the described output circuit of control that discharge and recharge of ferric phosphate lithium cell group.
SoC estimation during the discharge of ferric phosphate lithium cell group:
When lithium manganate battery all is in full power state in ferric phosphate lithium cell group and the output circuit in the input circuit, suppose that their capacity is respectively C
FWith C
MWhen the ferric phosphate lithium cell group begins to discharge in the input circuit, total current intensity in the circuit is I, control circuit starts work simultaneously, analog to digital converter becomes digital signal transfers to single-chip microcomputer the current conversion of input circuit, single-chip microcomputer sends instruction, makes lithium manganate battery in the output circuit that (n is as greater than 1 positive integer and nC take I/n
M＞C
F) strength of current discharge, relay receives rapid closing after the instruction of single-chip microcomputer, lithium manganate battery is with the strength of current discharge of I/n.If be t the ferric phosphate lithium cell group discharge time in the input circuit, after discharge finished, managing electric quantity IC showed that the charged conservation rate of lithium manganate battery is S in the output circuit
M, then the charged conservation rate of ferric phosphate lithium cell group is:
S
F＝(C
F-It)/C
F×100％ (1)
The charged conservation rate of LiMn2O4 phosphorus electric battery is:
(2) formula substitution (1) formula is got:
(3) C in the formula
F, C
M, n is all known, at S
MCan by under the managing electric quantity IC detection case, can simply try to achieve S
F, and single-chip microcomputer can be according to C
F, C
MValue is regulated the size of n, so that C
F=nC
M, then (3) formula can be reduced to:
S
F＝S
M (4)
In sum, the charged conservation rate S of ferric phosphate lithium cell group in the time of can directly from output circuit, reading discharge among the managing electric quantity IC
F
Embodiment 2:
SoC estimation during the charging of ferric phosphate lithium cell group:
Before the charging, K switch in the output circuit is placed off-state, the charging port of lithium manganate battery and ferric phosphate lithium cell group is all inserted charge power supply, when the total charging current of ferric phosphate lithium cell group is I ' time, force the lithium manganate battery in the output circuit to charge with I '/n strength of current by input circuit, suppose that their capacity is respectively C
F' with C
M'.When the ferric phosphate lithium cell group begins to charge in the input circuit, total current intensity in the circuit is I ', control circuit starts work simultaneously, analog to digital converter becomes digital signal transfers to single-chip microcomputer the current conversion of control circuit, single-chip microcomputer sends instruction, makes lithium manganate battery in the output circuit that (n is as greater than 1 positive integer and nC take I '/n
M'＞C
F') strength of current charging, relay receives rapid closing after the instruction of single-chip microcomputer, lithium manganate battery is with the strength of current charging of I '/n.If the ferric phosphate lithium cell group duration of charging in the input circuit is t ', after charging finished, the charged conservation rate of ferric phosphate lithium cell group was S in the input circuit
F', managing electric quantity IC shows that the charged conservation rate of lithium manganate battery is S in the output circuit
M',
Estimating method is with embodiment 1.
In sum, the charged conservation rate S of ferric phosphate lithium cell group in the time of can directly from output circuit, reading charging among the managing electric quantity IC
F'.
More than technical scheme that the embodiment of the invention is provided be described in detail, used specific case herein principle and the embodiment of the embodiment of the invention are set forth, the explanation of above embodiment is only applicable to help to understand the principle of the embodiment of the invention; Simultaneously, for one of ordinary skill in the art, according to the embodiment of the invention, all will change on embodiment and range of application, in sum, this description should not be construed as limitation of the present invention.
Claims (3)
1. a method of judging fast the charged conservation rate of ferric phosphate lithium cell (group) (SoC) realizes by connecting a control circuit in electric battery, comprises input circuit and output circuit, it is characterized in that:
Described input circuit comprises ferric phosphate lithium cell group, current amplifier, analog to digital converter, single-chip microcomputer, wherein, the ferric phosphate lithium cell group is electrically connected with current amplifier, and current amplifier is electrically connected with analog to digital converter, analog to digital converter is electrically connected with single-chip microcomputer, consists of an input circuit;
Described output circuit comprises relay, lithium manganate battery, load, managing electric quantity IC, switch, wherein, the single-chip microcomputer of described input circuit is electrically connected with relay, relay is electrically connected with load, load is electrically connected with switch, switch is electrically connected with lithium manganate battery, and lithium manganate battery is electrically connected with managing electric quantity IC, consists of an output loop;
The method of the charged conservation rate of described a kind of quick judgement ferric phosphate lithium cell (group) (SoC), be specially: when described ferric phosphate lithium cell (group) discharges, its strength of current of input circuit automatic analysis is also sent instruction, relay closes in the order output circuit, lithium manganate battery is also with certain strength of current discharge, detect the SoC of lithium manganate battery by managing electric quantity IC, according to the linear dependence relation of the carrying capacity of the carrying capacity of lithium manganate battery and ferric phosphate lithium cell (group), can draw the SoC of ferric phosphate lithium cell (group);
The method of the charged conservation rate of described a kind of quick judgement ferric phosphate lithium cell (group) (SoC), be specially: when described ferric phosphate lithium cell (group) charges, its strength of current of input circuit automatic analysis is also sent instruction, relay closes in the order output circuit, lithium manganate battery is also with certain strength of current charging, detect the SoC of lithium manganate battery by managing electric quantity IC, according to the linear dependence relation of the carrying capacity of the carrying capacity of lithium manganate battery and ferric phosphate lithium cell (group), can draw the SoC of ferric phosphate lithium cell (group).
2. the method for the charged conservation rate of ferric phosphate lithium cell according to claim 1 (group) (SoC), it is characterized in that: described single-chip microcomputer can be regulated automatically according to the electric capacity of ferric phosphate lithium cell group and the capacitance value of lithium manganate battery when work, so that the electric capacity of ferric phosphate lithium cell group equals the integral multiple of the electric capacity of lithium manganate battery.
3. the method for the charged conservation rate of ferric phosphate lithium cell according to claim 1 (group) (SoC) is characterized in that:
The carrying capacity of described lithium manganate battery closes with the linear dependence of the carrying capacity of ferric phosphate lithium cell (group): the charged conservation rate when the charged conservation rate during ferric phosphate lithium cell (group) charging charges with lithium manganate battery equates, the charged conservation rate of ferric phosphate lithium cell group in the time of directly can reading discharge among the managing electric quantity IC from controlled circuit; Charged conservation rate when the charged conservation rate during ferric phosphate lithium cell (group) discharge discharges with lithium manganate battery equates, the charged conservation rate of ferric phosphate lithium cell group in the time of directly can reading discharge among the managing electric quantity IC from controlled circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110301744.3A CN103033753B (en) | 2011-10-09 | One quickly judges ferric phosphate lithium cell or the method for set of cells spray charging precipitator (SoC) |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110301744.3A CN103033753B (en) | 2011-10-09 | One quickly judges ferric phosphate lithium cell or the method for set of cells spray charging precipitator (SoC) |
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|---|---|
| CN103033753A true CN103033753A (en) | 2013-04-10 |
| CN103033753B CN103033753B (en) | 2016-11-30 |
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