CN201238069Y - Low-temperature polymer lithium accumulator pack - Google Patents

Low-temperature polymer lithium accumulator pack Download PDF

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Publication number
CN201238069Y
CN201238069Y CNU2008200290841U CN200820029084U CN201238069Y CN 201238069 Y CN201238069 Y CN 201238069Y CN U2008200290841 U CNU2008200290841 U CN U2008200290841U CN 200820029084 U CN200820029084 U CN 200820029084U CN 201238069 Y CN201238069 Y CN 201238069Y
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CN
China
Prior art keywords
battery
chip microcomputer
storage battery
circuit
voltage
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Expired - Fee Related
Application number
CNU2008200290841U
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Chinese (zh)
Inventor
陈太华
王宏栋
陈刚
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XI'AN FENGLI NEW-ELECTRICAL SOURCE Co Ltd
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XI'AN FENGLI NEW-ELECTRICAL SOURCE Co Ltd
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Priority to CNU2008200290841U priority Critical patent/CN201238069Y/en
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Publication of CN201238069Y publication Critical patent/CN201238069Y/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The utility model relates to a low-temperature polymer lithium storage battery pack which comprises a lithium storage battery pack and a micro-electronic control and protection device matched with the lithium storage battery pack, wherein, the micro-electronic control and protection device comprises a storage battery pack voltage sampling circuit, a storage battery pack voltage equalizing circuit, a single-chip microcontroller, a charging control circuit and a discharging control circuit. During working, the device can drive the corresponding circuit to realize the automatic equalization of the each single cell capacity via the computer-controlled system according to the voltage sampling signal of each single cell in the storage battery pack; the protection voltage of overdischarging is 2 volts; the protection voltage of overcharging is less than or equal to 4.2 volts, thereby being suitable for the characteristics of the low-temperature lithium battery. Adopting the colloidal dielectric medium, the lithium storage battery pack can greatly increase the security of the battery pack. The utility model has the advantages of reasonable structure, reliable performance, long service life and the like.

Description

Low temperature polymer lithium storage battery group
Technical field
The utility model belongs to electric energy storage system circuit arrangement technical field, relates to a kind of low temperature polymer lithium storage battery group.
Background technology
Lithium ion battery is applied to mobile communication more and more widely because volume is little, specific energy is high, memoryless benefit, characteristics such as pollution-free, and industry fields such as outdoor measurement, instrument become the novel energy that other battery can not replace.Yet still there are three big defectives in the lithium battery of manufacturer production both at home and abroad at present, and be embodied in: 1, low temperature performance is poor, and the discharge temp scope of domestic lithium battery is-25~+ 55 ℃, can't discharge at extremely frigid zones; 2, there is potential explosion hazard,, threatens the life security of person who want to call even battery of mobile phone also has the anxiety of blasting; 3, the batteries formed of multi-string battery is because the consistent difference of battery, a plurality of charge and discharge circulation after, a few Battery pack groups usually taking place are not fully filled electricity, thereby reduces the discharge capacity of batteries, shorten the useful life of batteries.Over the past two years, domestic existing battery production factory few in number began to develop the lithium ion battery that also can discharge under-40 ℃ of environment, but discharge-rate is little, the big electric current of needs in the time of can't satisfying the equipment low-temperature working; So the while, inoperable disadvantage under-40 ℃ of environment appears in the indispensable microelectronics protective device (abbreviation baffle) equally supporting with lithium battery.In addition; the baffle of domestic present use; the cell overdischarge pressure value of setting is 2.3~2.7V; but under the cryogenic conditions during heavy-current discharge; cell discharge starting stage voltage can drop to 2.1~2.4V significantly from 4.2V; if adopt the normal temperature battery protecting plate, its control chip can turn-off output in several microseconds, makes the battery pack can't operate as normal.
The utility model content
The purpose of this utility model is the above-mentioned three big defectives that prior art exists, and then a kind of rational in infrastructure, dependable performance is provided, can realizes that battery capacity automatic equalization also can make battery pack initial drain under-40 ℃ of ambient temperatures〉0.5C 5The polymer lithium batteries.
The technical solution that adopts is so for achieving the above object: the low temperature polymer lithium storage battery group that is provided is by having added ethylene carbonate in the dielectric; propylene carbonate; methyl ethyl carbonate fat; diethyl carbonate; the ethene amyl acetate; the lithium storage battery group of six kinds of active solvents of VC and the microelectronics control and the protective device that match with this lithium storage battery group are formed; wherein said microelectronics control and protective device are by the battery voltage sample circuit; the battery voltage equalizing circuit; single-chip microcomputer; charging control circuit and charge/discharge control circuit are formed; the input of voltage sampling circuit and output are connected to the positive electrode of each cell in the lithium storage battery group and the sampled signal input of single-chip microcomputer respectively; equalizing circuit input and output are connected to respectively on the positive electrode of each cell in the electric voltage equalization control output end of single-chip microcomputer and the battery pack; the input of charging control circuit is connected with the battery pack positive electrode with the charging control output end of single-chip microcomputer respectively with output, and the input of charge/discharge control circuit is connected with the battery pack positive electrode with the discharge control output end of single-chip microcomputer respectively with output.The course of work of this device is such: the voltage of each cell is sampled by sample circuit in the lithium storage battery group, sampled voltage is added to the sampled signal input of single-chip microcomputer, single-chip microcomputer (adjustable) at regular intervals detects the voltage of each cell in the primary cell group, if the voltage on each cell is all in 2.8~4.2V, the then equal conducting of charging control circuit and charge/discharge control circuit, battery normally discharges and recharges; If in the battery pack certain only or the difference of the voltage between a few cells and other cell greater than 0.13V, then single-chip microcomputer will make the corresponding MOSFET pipe conducting that is connected in parallel on the higher battery of voltage two ends in the voltage balance circuit, the rate of voltage rise that makes these batteries rate of voltage rise minimum corresponding to voltage and low battery slows down, and then the voltage difference between each cell is dwindled gradually.In battery charging process, reached 4.2V as if certain or a few voltages, single-chip microcomputer will turn-off charging control circuit, making electric lithium hold the pond group temporarily stops to charge and making the cell low discharging current that reaches 4.2V voltage, behind the certain hour interval, single-chip microcomputer detects the voltage of each cell again, as all not surpassing 4.2V, then make charging control circuit open-minded again, the lithium storage battery group continues charging, after this lithium storage battery group enters the pulse current charge state, charging interval shortens gradually, stops the charging interval remaining unchanged, and all reaches 4.2V until all batteries voltage.And in lithium storage battery group discharge process, if when the voltage of certain battery has dropped to 2V, single-chip microcomputer will turn-off charge/discharge control circuit, make the lithium storage battery group stop discharge.
In the dielectric (Cobalt acid lithium and LiMn2O4) of lithium storage battery group described in the utility model, add a certain amount of low temperature additive, its composition and ratio are as follows: 1MLiPF6/EC (ethylene carbonate): PC (propylene carbonate): DEC (diethyl carbonate): EMC (methyl ethyl carbonate)=2:2:2:4 adds 1%VC (inferior vinyl carbonate) and 1%EA (ethene acetate) in addition, and active solvent accounts for 2~5% of dielectric total amount.After having added active solvent, this lithium storage battery group dielectric also can regular picture under-40 ℃ of environment and discharge steadily.The ratio and the discharge-rate of active solvent are proportional, and ratio is high more, and discharge-rate is big more.But active solvent at high temperature has very strong volatility, and addition can cause the battery bubbling too much, influences the fail safe of battery.Therefore the ratio of active solvent must be moderate, increase the active solvent of above ratio after, low temperature lithium battery group operating state can reach: initial drain under (1) ,-40 ℃ of environment〉0.5C 5(C 5Be battery capacity * 0.5), discharge after 5~10 minutes, discharging current can 0.7C 5(2), under-40 ℃ of ambient temperatures, discharging current〉0.5C 5The time, can drop to 2.1~2.4V from 4.3V between the short time voltage of cell, voltage gos up again to 3.2~3.5V after 5 minutes, and the later stage discharge is steadily.
Compare with the widely used normal temperature in domestic market (25~+ 55 ℃) lithium battery; it is good that low temperature polymer lithium battery group described in the utility model has a low temperature performance; advantage such as safe and reliable; satisfy the demand of electronic equipment operate as normal under the low temperature, adopted the equalizing charge control protection electric circuit can also prolong the useful life of battery pack.
Description of drawings
Fig. 1 is a work structuring theory diagram of the present utility model.
Fig. 2 is to be the microelectronics control of lithium storage battery group of example and the electrical block diagram of protective device with four strings.
Each module label is respectively among the figure: 1-lithium storage battery group, and 2-battery voltage sample circuit, 3-battery voltage equalizing circuit, 4-single-chip microcomputer, 5-charging control circuit, 6-charge/discharge control circuit, 7-indicating circuit, 8-certainly recover insurance circuit.
Embodiment
Referring to accompanying drawing, low temperature polymer lithium storage battery group described in the utility model is controlled by lithium storage battery group 1 and microelectronics and protective device two parts are formed.Microelectronics control and protective device contain battery voltage sample circuit 2, battery voltage balancing control circuit 3, single-chip microcomputer 4, charging control circuit 5 and charge/discharge control circuit 6 and indicating circuit 7, recover circuit such as insurance circuit 8 certainly.More than 1 single lithium battery series connection of lithium storage battery group constitutes (the lithium battery group is an example with four strings among Fig. 2).It is the integrated chip of 78P458 that sheet machine 4 adopts model, generally detects the once voltage of each cell every 2~7 seconds (adjustable).Sample circuit 2 is made of form respectively according to resistance R 1~R9 four groups bleeder circuits in parallel, and its voltage sampling end of respectively organizing circuit is connected respectively on pin P61, P62, P63, the P64 of the AD converter in the single-chip microcomputer 4.Battery voltage equalizing circuit 3 comprise with battery pack in cell number (B1~B4, totally four) the monomer battery voltage sub-control circuit of respective amount, the input of monomer battery voltage sub-control circuit respectively with single-chip microcomputer (4) pin P55, P54, P66, P65 holds UNICOM, all contain a MOSFET pipe (V4 or V3 or V2 or V1) that is used for balanced monomer battery voltage in each sub-control circuit, the output grid of each MOSFET pipe is added in the two ends of corresponding cell respectively, can be used for according to the situation of change of relative other battery of this cell voltage capacity its difference being given equilibrium.Charging control circuit 5 in the utility model is made of MOSFET pipe V6 and power amplifier thereof, the P56 pin UNICOM of the input of this control circuit 5 and single-chip microcomputer 4, and output then is added on the battery set electrode.In the charging process if certain in the battery pack only or the voltage of a few cells reach 4.2V, single-chip microcomputer 4 will turn-off V6 makes battery pack suspend charging, when each cell all is no more than 4.2V again, single-chip microcomputer 4 makes the V6 conducting again thereafter, the battery pack continuation is charged.The charge/discharge control circuit 6 of this lithium storage battery group is made of MOSFET pipe V5 and power amplifier thereof, the P57 pin UNICOM of the input of its control circuit 6 and single-chip microcomputer 4, and output is added on the battery set electrode equally.When if the voltage of a certain cell drops to 2V, single-chip microcomputer 4 will turn-off V5, thereby make battery pack stop to discharge in the discharge process.In addition, in this device, also be provided with from recovering insurance circuit 8 and indicating circuit 7, wherein constitute by fuse F1 from recovering insurance circuit 8, in the battery set charge/discharge process, make electric current surpass the setting of customer requirements (2~15A) time because of short circuit or over current fault occurring, F1 becomes off state, and battery pack stops to discharge and recharge, after short circuit or over current fault are eliminated, F1 recovers conducting state, and battery pack can normally discharge and recharge; Indicating circuit 7 is made of four LED 1~LED4 that are arranged in parallel, the input of LED1~LED4 is connected to P53, P52, P51, the P50 pin of single-chip microcomputer 4 respectively, in the charging process, after the voltage of certain cell reached 4.2V, corresponding luminous tube was luminous, shows this cell full charge, and in discharge process, when certain monomer battery voltage drops to 2V, corresponding luminous tube is luminous, shows that this cell put.The mistake of cell is put protection voltage and is set at 2V in the utility model, is lower than domestic general protection voltage 2.3~2.7V, and test shows that battery pack initially will be with 0.5C under-40 ℃ of environment 5During current discharge, monomer battery voltage can drop to 2.1~2.4V from 4.3V, if protection voltage adopts 2.3~2.7V of normal temperature battery, the discharge control chip just can move in several microseconds, makes battery pack can not put electricity and comes.When the low temperature battery low-temperature characteristics was good, hot properties can descend greatly, and charging voltage is too high, and at high temperature bubbling can take place battery.For guaranteeing battery security, the over-charge protective voltage of cell is decided to be 4.2V-0.05V, is lower than the over-charge protective magnitude of voltage of normal temperature battery 4.3~4.35V

Claims (3)

1; a kind of low temperature polymer lithium storage battery group; it is characterized in that forming by lithium storage battery group (1) and the control of the microelectronics that matches with this lithium storage battery group (1) and protective device; said microelectronics control and protective device are by battery voltage sample circuit (2); battery voltage equalizing circuit (3); single-chip microcomputer (4); charging control circuit (5) and charge/discharge control circuit (6) are formed; the input of voltage sampling circuit (2) and output are connected to the positive electrode of each cell in the lithium storage battery group (1) and the sampled signal input of single-chip microcomputer (4) respectively; equalizing circuit (3) input and output are connected to respectively on the positive electrode of each cell in the electric voltage equalization control output end of single-chip microcomputer (4) and the battery pack (1); the input of charging control circuit (5) is connected with the battery pack positive electrode with the charging control output end of single-chip microcomputer (4) respectively with output, and the input of charge/discharge control circuit (6) is connected with the battery pack positive electrode with the discharge control output end of single-chip microcomputer (4) respectively with output.
2; low temperature polymer lithium storage battery group according to claim 1; it is characterized in that battery voltage equalizing circuit (3) in microelectronics control and the protective device comprise with battery pack in the monomer battery voltage sub-control circuit of cell number respective amount; single-chip microcomputer (4) adopts the 78P458 single-chip microcomputer; the input of monomer battery voltage sub-control circuit respectively with single-chip microcomputer (4) pin P55; P54; P66; P65 holds UNICOM; all contain a MOSFET pipe that is used for balanced monomer battery voltage in each sub-control circuit, the output grid of each MOSFET pipe is added in the two ends of corresponding cell respectively.
3; low temperature polymer lithium storage battery group according to claim 1; it is characterized in that the single-chip microcomputer (4) in microelectronics control and the protective device adopts the 78P458 single-chip microcomputer; charging control circuit (5) in microelectronics control and the protective device is made of MOSFET pipe and power amplifier thereof; the P56 pin UNICOM of the input of this control circuit and single-chip microcomputer; output is added on the battery set electrode; charge/discharge control circuit (6) in microelectronics control and the protective device is made of MOSFET pipe and power amplifier thereof; the P57 pin UNICOM of the input of this control circuit and single-chip microcomputer, output is added on the battery set electrode.
CNU2008200290841U 2008-05-13 2008-05-13 Low-temperature polymer lithium accumulator pack Expired - Fee Related CN201238069Y (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102721925A (en) * 2011-03-31 2012-10-10 昆山金鑫新能源科技有限公司 Intelligent lithium battery protection board tester
CN102969699A (en) * 2012-11-08 2013-03-13 惠州市蓝微电子有限公司 Lithium battery protection circuit
WO2013155725A1 (en) * 2012-04-18 2013-10-24 常州合力电器有限公司 Lithium battery mower
CN103441542A (en) * 2013-08-13 2013-12-11 天津谷泰科技有限公司 Lithium battery distributed charging equalization circuit and control method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102721925A (en) * 2011-03-31 2012-10-10 昆山金鑫新能源科技有限公司 Intelligent lithium battery protection board tester
WO2013155725A1 (en) * 2012-04-18 2013-10-24 常州合力电器有限公司 Lithium battery mower
CN102969699A (en) * 2012-11-08 2013-03-13 惠州市蓝微电子有限公司 Lithium battery protection circuit
CN102969699B (en) * 2012-11-08 2016-03-02 惠州市蓝微电子有限公司 A kind of lithium battery protection circuit
CN103441542A (en) * 2013-08-13 2013-12-11 天津谷泰科技有限公司 Lithium battery distributed charging equalization circuit and control method thereof
CN103441542B (en) * 2013-08-13 2015-02-11 天津谷泰科技有限公司 Lithium battery distributed charging equalization circuit and control method thereof

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C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20090513

Termination date: 20130513