CN102820486A - Lithium iron phosphate battery module with heavy load discharge technology - Google Patents
Lithium iron phosphate battery module with heavy load discharge technologyDownload PDFInfo
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- CN102820486A CN102820486ACN2012102155281ACN201210215528ACN102820486ACN 102820486 ACN102820486 ACN 102820486ACN 2012102155281 ACN2012102155281 ACN 2012102155281ACN 201210215528 ACN201210215528 ACN 201210215528ACN 102820486 ACN102820486 ACN 102820486A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
Description
Technical field
The present invention relates to a kind of ferric phosphate lithium cell pack module of heavy-current discharge technology.
Background technology
Traditional emergency starting power supplys such as car and boat adopt lead acid accumulator more, and the reinforcement of Along with people's environmental consciousness in recent years becomes more and more thorny for the processing of employed lead of lead acid accumulator and sulfuric acid.Lithium battery is pollution-free, and the feature of environmental protection adopts lithium battery to replace lead-acid battery, as the battery in the emergency starting power supply, just becomes following trend of the times.
But lithium battery does not have high discharge-rate at present, and modal is exactly with interior (1C=1 hour rate rated capacity (A.H) at 30C; As: the battery 1C=8A of 8AH).Such as the battery of a joint 8AH, its maximum discharge current is exactly 30 * 8=240 ampere.This can not adapt to the oversize vehicle of great start-up current far away.
The voltage of each single lithium battery has only 3.2V, and that still at present a lot of fields need is 6V, 12V, 24V, 48V or the like.If do not adopt series connection, then the application of lithium battery monomer will be limited greatly.Present widely used maintenance-free lead-acid battery also is made up of monomer series-connected in fact, and each monomer is 2V.But this will solve problems such as balance charge/discharge, temperature protection, overcurrent protection, short-circuit protection from the monomer to the series connection, could really get into to use.Lead-acid battery has the history in more than 100 year, its very long road of also having passed by from monomer to series connection.Along with people's more and more presses for free of contamination lithium battery group and replaces the lead-acid battery group the reinforcement of environmental consciousness now.
Summary of the invention
The ferric phosphate lithium cell pack module of a kind of heavy-current discharge technology provided by the invention is realized the series connection of more piece cell, and can stablize alternative lead-acid battery group.More outstanding is, at the heavy-current discharge technical elements of serial lithium battery group, obtains fruitful result, and discharge-rate is up to 80C, and high energy reaches 150C.The present invention will promote single lithium battery through in groups greatly, be widely used in every field.Include but not limited to automobile 12V, the 24V system.
In order to achieve the above object, the present invention provides a kind of ferric phosphate lithium cell pack module of heavy-current discharge technology, and this ferric phosphate lithium cell pack module comprises ferric phosphate lithium cell group and the battery pack control circuit that circuit connects;
Described ferric phosphate lithium cell group comprises the single lithium battery of some series connection, and the short circuit sheet is connected to the negative pole that another saves single lithium battery with the positive pole of a joint single lithium battery, and whole ferric phosphate lithium cell group comprises and also comprises output cathode and output negative pole;
Described battery pack control circuit comprises the high-current relay of circuit connection ferric phosphate lithium cell group, the governor circuit that circuit connects this high-current relay, and circuit connects the battery pack protective circuit of this governor circuit; Described high-current relay circuit connects the output cathode and the governor circuit of ferric phosphate lithium cell group.
Described short circuit sheet adopts copper sheet.
Described output cathode and output negative pole surface gold-plating are handled, with battery contact resistance pond less than 0.5 milliohm.
Described single lithium battery comprises positive plate, negative plate, barrier film, electrolyte and shell, and described positive plate comprises collector and be coated in the positive electrode on the collector that this positive electrode comprises positive active material, adhesive and conductive agent;
Described positive active material comprises nano-scale lithium iron phosphate and micron order LiFePO4, and the weight ratio of said nano-scale lithium iron phosphate and micron order LiFePO4 is 1:7～1:9.
Middle particle diameter D50 in the described nano-scale lithium iron phosphate is distributed as 300nm-900nm.
Middle particle diameter D50 in the described micron order LiFePO4 is distributed as 2um-10um.
The single face coated weight of said positive active material on collector is 80～140g/m2
Described battery pack protective circuit comprises reversal connection/misconnection protective circuit, single battery voltage sampling circuit, temperature protection circuit, current foldback circuit and the charging control protection electric circuit that circuit respectively connects said governor circuit.
Discharging current provided by the invention has well solved a puzzlement industry above difficult problem for a long time at the lithium battery discharge technology of 80 ~ 150C.
The ferric phosphate lithium cell group of heavy-current discharge technology has high storage power density, and the lead-acid battery lithium battery is in light weight relatively, and weight is about 1/5th or sixth of lead-acid battery under the equal volume.
The useful life of lithium battery is longer relatively, possesses the high power holding capacity.High low temperature applicability is strong, and environmental protection no matter produce, use and scrap, does not contain, do not produce yet poisonous and harmful heavy metallic element and materials such as any lead, mercury.
Compare with lead-acid battery, the present invention makes full use of the born advantage of LiFePO4, has environmental protection, and volume is littler; Characteristics such as weight is lighter, and cycle life is longer, and self-discharge rate is lower, the present invention has many defencive functions; For example, temperature protection, overcurrent protection, short-circuit protection; Charging control, functional units such as misconnection, reversal connection warning, this topmost function of realization heavy-current discharge that can be safe, stable.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is physical circuit figure of the present invention;
Fig. 3 is a control flow chart of the present invention.
Embodiment
Following according to Fig. 1～Fig. 3, specify preferred embodiment of the present invention.
As shown in Figure 1, the ferric phosphate lithium cell pack module of a kind of heavy-current discharge technology provided by the invention comprises the ferric phosphate lithium cell group 101 and battery pack control circuit that circuit connects;
Described ferric phosphate lithium cell group comprises thesingle lithium battery 1011 of some series connection; Short circuit sheet 1012 is connected to the negative pole that another saves single lithium battery with the positive pole of a joint single lithium battery, and whole ferric phosphate lithium cell group comprises and also comprisesoutput cathode 1014 and output negative pole 1013;
In the present embodiment; Adopt four jointsingle lithium battery 1011 to be composed in series the ferric phosphate lithium cell group, every jointsingle lithium battery 1011 voltages are 3.2 volts, after four joints are connected through short circuit sheet 1012; The voltage of ferric phosphate lithium cell group 101 is 3.2 volts ofх 4=12.8 volts, can substitute common 12V lead-acid battery;
Because be 1 millimeter by thickness between this ferric phosphate lithium cell group, width is 20 millimeters, length is that the copper sheet after 38 millimeters and the electroplate processing is connected in series as the short circuit sheet.Guarantee the ducting capacity when it enough bears battery pack with maximum discharge-rate.Be example with 8AH with the multiplying power discharging of 80～150C, discharging current is at 640 ~ 1200A, so; The short circuit sheet of series connection usefulness is through various harsh experiments, and adopting thickness at last is 1 millimeter, and width is 20 millimeters; Length is 38 millimeters copper sheet, experiment showed, to tolerate this discharging current; Other each AH has the copper sheet of corresponding different specification size;
Describedsingle lithium battery 1011 comprises positive plate, negative plate, barrier film, electrolyte and shell, and described positive plate comprises collector and be coated in the positive electrode on the collector that this positive electrode comprises positive active material, adhesive and conductive agent;
Described positive active material comprises nano-scale lithium iron phosphate and micron order LiFePO4, and the weight ratio of said nano-scale lithium iron phosphate and micron order LiFePO4 is 1～7: 1～9;
Middle particle diameter D50 in the described nano-scale lithium iron phosphate is distributed as 300nm-900nm;
Middle particle diameter D50 in the described micron order LiFePO4 is distributed as 2um-10um;
The single face coated weight of said positive active material on collector is 80～140g/m2
Described battery pack control circuit comprises the high-current relay 104 of circuit connection ferric phosphate lithium cell group, the governor circuit 103 that circuit connects this high-current relay, and circuit connects the battery pack protective circuit 102 of this governor circuit; Described high-current relay 104 circuit connect the output cathode and the governor circuit of ferric phosphate lithium cell group;
The operation principle of the ferric phosphate lithium cell pack module of this heavy-current discharge technology is: when externally condition satisfies; The ferric phosphate lithium cell group is under governor circuit control; Through the high-current relay adhesive; The positive pole of ferric phosphate lithium cell pack module, negative pole externally carry out heavy-current discharge, the operate as normal of battery pack protective circuit protection ferric phosphate lithium cell group.
As shown in Figure 2, described battery pack protective circuit 102 comprises reversal connection/misconnection protective circuit 1021, single battery voltage sampling circuit 1022, temperature protection circuit 1023, current foldback circuit 1024 and the charging control protection electric circuit 1025 that circuit respectively connects said governor circuit;
Described governor circuit 103 adopts single-chip microcomputer MC96F6432Q, when externally condition satisfies, does not have short circuit such as the outside; Single-chip microcomputer the 54th pin output high level of governor circuit makes triode Q27 conducting, and then high-current relay 104 adhesive conductings; The positive pole of ferric phosphate lithium cell group 101, negative pole output to the positive pole of the ferric phosphate lithium cell pack module of heavy-current discharge technology, and negative pole externally carries out heavy-current discharge; If the technological ferric phosphate lithium cell pack module operation irregularity of heavy-current discharge this moment, overheated such as the ferric phosphate lithium cell group, governor circuit can be made a response; Close the external heavy-current discharge of high-current relay, to protect sour lithium iron battery pack module safety;
The main electronic device of reversal connection/misconnection protective circuit 1021 adopts optocoupler TLP627; When the positive pole of the ferric phosphate lithium cell pack module of heavy-current discharge technology and negative pole and external loading (like battery) when being connected, the optocoupler U8B conducting of described reversal connection/misconnection protective circuit 1021 is explained the external loading connection correctly; Optocoupler U8B exports single-chip microcomputer 9th pin of correct signal to governor circuit; After single-chip microcomputer was received this signal, program was made correct identification, and single-chip microcomputer is from the control signal of the 44th pin output high-current relay then; The conducting of control high-current relay, the ferric phosphate lithium cell pack module of heavy-current discharge technology is the big electric current of output externally;
If the optocoupler U8C conducting of reversal connection/misconnection protective circuit 1021; External loading connection error is described, optocoupler U8C output signal is to single-chip microcomputer the 10th pin of governor circuit, after single-chip microcomputer is received this signal; Program is made correct identification; Single-chip microcomputer is from the control signal of the 44th pin output high-current relay then, and the control high-current relay breaks off, and the ferric phosphate lithium cell pack module of heavy-current discharge technology externally can not be exported big electric current;
The main electronic device of described single battery voltage sampling circuit 1022 adopts integrated transporting discharging LM224AD; P type metal-oxide-semiconductor BSS84 and triode S8550; The voltage of 1022 pairs of four single lithium battery of single battery voltage sampling circuit is sampled respectively; By its correct voltage of single-chip microcomputer identification of governor circuit, the voltage foundation during as charging or external heavy-current discharge; The input VBAT+ of single battery voltage sampling circuit 1022, B2, B3, B4 connect the positive pole of ferric phosphate lithium cell group the 1st batteries respectively, the positive pole of the 2nd batteries, the positive pole of anodal and the 4th batteries of the 3rd batteries; Three part U1A of amplifier U1, U1B, U1C and interlock circuit; Monomer voltage through computing summing circuit output four joint single lithium battery; Deliver to the 28th pin of governor circuit single-chip microcomputer respectively, the 27th pin, the 26th pin and the 25th pin; Single-chip microcomputer can obtain the real voltage of four single batteries through filtering algorithm;
The main electronic device temperature transducer RT2 of described temperature protection circuit 1023 adopts NTC 10K resistance; When the temperature of ferric phosphate lithium cell pack module was spent above 60, the corresponding resistance of temperature sensor RT2 of negative temperature coefficient can change, and the voltage of resistance R 68 can change; Single-chip microcomputer the 34th pin of governor circuit detects this change in voltage; Through sequential operation, identify the temperature of ferric phosphate lithium cell pack module, and on this basis; Governor circuit can break off the external power supply of ferric phosphate lithium cell pack module, can effectively protect the ferric phosphate lithium cell group;
The main electronic device of described current foldback circuit 1024 adopts integrated transporting discharging LM358AM; When ferric phosphate lithium cell group during to heavy-current discharge; If surpass the current value of setting; Program can be made reflection in 0.5 second, governor circuit can break off the external power supply of ferric phosphate lithium cell pack module, can effectively protect the ferric phosphate lithium cell pack module; The ferric phosphate lithium cell pack module cathode voltage of the heavy-current discharge technology of sampling is input to amplifier U9B inside through R119 and carries out voltage amplification; Signal after the amplification is input to the 31st pin of governor circuit single-chip microcomputer; Program is carried out analog-to-digital conversion after detecting this signal; Single-chip microcomputer obtains the actual value of the big electric current of module after signal procedure is handled, according to this value, if surpass the current value of setting; Governor circuit can cut off the external power supply of ferric phosphate lithium cell pack module, reaches the purpose of overcurrent protection;
The main electronic device of described charging control protection electric circuit 1025 adopts integrated transporting discharging LM224AD; When the ferric phosphate lithium cell group is charged; If overcharge conditions, governor circuit can automatic disconnection ferric phosphate lithium cell pack module, and avoiding overcharging influences its useful life; When governor circuit samples the single battery brownout of ferric phosphate lithium cell group, when ferric phosphate lithium cell group voltage is lower than 8 volts, single-chip microcomputer the 43rd pin of governor circuit output high level; Make the Q17 conducting in the charging control protection electric circuit, and then also conducting of Q28, external charger is charged to the ferric phosphate lithium cell group through Q28; Simultaneously, the charging control protection electric circuit is sampled through 50 pairs of charging currents of resistance R, and U1D amplifies sampled voltage through amplifier; Be sent to the 31st pin of governor circuit single-chip microcomputer, program detects charging process in real time, when the ferric phosphate lithium cell group is full of electricity; Single-chip microcomputer the 43rd pin output low level is cut off charge circuit.
As shown in Figure 3, the ferric phosphate lithium cell pack module control flow in an embodiment of a kind of heavy-current discharge technology provided by the invention comprises following steps:
Step 5, governor circuit judge all connections be effectively qualified after, output connects the conducting order automatically, makes high-current relay adhesive work;
Step 6, governor circuit are accomplished discharging current, cell voltage and discharge time and are detected, and carry out step 12 and step 7 simultaneously;
Step 7, governor circuit judge whether cell voltage is lower than 8.0V, if, jump to step 11, if not, jump to step 8;
Step 8, governor circuit judge whether battery temperature is higher than 60 degree, if, jump to step 11, if not, jump to step 9;
Whether step 9, governor circuit judge electric current greater than set point, if, jump to step 11, if not, jump to step 10;
Step 10, governor circuit judge whether reach 5 seconds discharge time, if, jump to step 13, if not, jump to step 5;
Step 11, governor circuit break off high-current relay;
Step 12, governor circuit recording detection data;
Step 13, stop the discharge, jump tostep 1.
Although content of the present invention has been done detailed introduction through above-mentioned preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be conspicuous.Therefore, protection scope of the present invention should be limited appended claim.
Claims (8)
1. the ferric phosphate lithium cell pack module of a heavy-current discharge technology is characterized in that, this ferric phosphate lithium cell pack module comprises ferric phosphate lithium cell group (101) and the battery pack control circuit that circuit connects;
Described ferric phosphate lithium cell group comprises the single lithium battery (1011) of some series connection; Short circuit sheet (1012) is connected to the negative pole that another saves single lithium battery with the positive pole of a joint single lithium battery, and whole ferric phosphate lithium cell group comprises and also comprises output cathode (1014) and output negative pole (1013);
Described battery pack control circuit comprises the high-current relay (104) of circuit connection ferric phosphate lithium cell group, the governor circuit (103) that circuit connects this high-current relay, and circuit connects the battery pack protective circuit (102) of this governor circuit; Described high-current relay (104) circuit connects the output cathode and the governor circuit of ferric phosphate lithium cell group.
2. the ferric phosphate lithium cell pack module of heavy-current discharge technology as claimed in claim 1 is characterized in that described short circuit sheet (1012) adopts copper sheet.
3. the ferric phosphate lithium cell pack module of heavy-current discharge as claimed in claim 1 technology is characterized in that, described output cathode (1014) and the processing of output negative pole (1013) surface gold-plating, with battery contact resistance pond less than 0.5 milliohm.
4. the ferric phosphate lithium cell pack module of heavy-current discharge technology as claimed in claim 1; It is characterized in that; Described single lithium battery (1011) comprises positive plate, negative plate, barrier film, electrolyte and shell; Described positive plate comprises collector and is coated in the positive electrode on the collector that this positive electrode comprises positive active material, adhesive and conductive agent.
5. described positive active material comprises nano-scale lithium iron phosphate and micron order LiFePO4, and the weight ratio of said nano-scale lithium iron phosphate and micron order LiFePO4 is 1:7～1:9.
6. the ferric phosphate lithium cell pack module of heavy-current discharge technology as claimed in claim 4 is characterized in that the middle particle diameter D50 in the described nano-scale lithium iron phosphate is distributed as 300nm-900nm.
The ferric phosphate lithium cell pack module of heavy-current discharge technology as claimed in claim 4 is characterized in that the middle particle diameter D50 in the described micron order LiFePO4 is distributed as 2um-10um.
7. the ferric phosphate lithium cell pack module of heavy-current discharge technology as claimed in claim 4 is characterized in that the single face coated weight of said positive active material on collector is 80～140g/m2
8. the ferric phosphate lithium cell pack module of heavy-current discharge technology as claimed in claim 1; It is characterized in that described battery pack protective circuit (102) comprises reversal connection/misconnection protective circuit (1021), single battery voltage sampling circuit (1022), temperature protection circuit (1023), current foldback circuit (1024) and the charging control protection electric circuit (1025) that circuit respectively connects said governor circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102155281ACN102820486A (en) | 2012-06-28 | 2012-06-28 | Lithium iron phosphate battery module with heavy load discharge technology |
| PCT/CN2012/001222WO2014000133A1 (en) | 2012-06-28 | 2012-08-31 | Lithium iron phosphate battery pack module of large-current discharge technologies |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102155281ACN102820486A (en) | 2012-06-28 | 2012-06-28 | Lithium iron phosphate battery module with heavy load discharge technology |
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| CN102820486Atrue CN102820486A (en) | 2012-12-12 |
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| CN2012102155281APendingCN102820486A (en) | 2012-06-28 | 2012-06-28 | Lithium iron phosphate battery module with heavy load discharge technology |
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| CN (1) | CN102820486A (en) |
| WO (1) | WO2014000133A1 (en) |
Cited By (5)
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| CN103985832A (en)* | 2014-05-08 | 2014-08-13 | 苏州卓德电子有限公司 | Lithium iron phosphate battery pack used for outdoor photoflash lamps |
| CN104753108A (en)* | 2013-12-30 | 2015-07-01 | 比亚迪股份有限公司 | Backup power supply |
| CN105518957A (en)* | 2015-04-30 | 2016-04-20 | 鑫能源科技(深圳)有限公司 | Battery protection device |
| CN105811540A (en)* | 2016-05-26 | 2016-07-27 | 江苏深苏电子科技有限公司 | Safe high-discharging-rate lithium battery pack module |
| CN108231502A (en)* | 2017-12-27 | 2018-06-29 | 黄朝仁 | A kind of wiring unit of electric automatization accumulator with two level short-circuit protection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104753108A (en)* | 2013-12-30 | 2015-07-01 | 比亚迪股份有限公司 | Backup power supply |
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| CN103985832A (en)* | 2014-05-08 | 2014-08-13 | 苏州卓德电子有限公司 | Lithium iron phosphate battery pack used for outdoor photoflash lamps |
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| CN105811540A (en)* | 2016-05-26 | 2016-07-27 | 江苏深苏电子科技有限公司 | Safe high-discharging-rate lithium battery pack module |
| CN108231502A (en)* | 2017-12-27 | 2018-06-29 | 黄朝仁 | A kind of wiring unit of electric automatization accumulator with two level short-circuit protection |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014000133A1 (en) | 2014-01-03 |
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