CN202019034U - Lithium ion battery management system - Google Patents

Lithium ion battery management system Download PDF

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Publication number
CN202019034U
CN202019034U CN201120026718XU CN201120026718U CN202019034U CN 202019034 U CN202019034 U CN 202019034U CN 201120026718X U CN201120026718X U CN 201120026718XU CN 201120026718 U CN201120026718 U CN 201120026718U CN 202019034 U CN202019034 U CN 202019034U
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battery
module
temperature
voltage
microcontroller
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CN201120026718XU
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陈冠豪
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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 lithium ion battery management system. The lithium ion battery management system comprises a plurality of battery voltage sampling modules, a temperature sampling module, a microcontroller, a PWM (Pulse Width Modulation) charge controller and a plurality of equilibrium gate control modules, wherein the battery voltage sampling modules are used for measuring voltage values V of all single batteries in all battery strings in a battery module; the temperature sampling module is used for measuring the temperature value T of the battery module; the microcontroller is used for receiving the voltage values V of all the single batteries, which are measured by the battery voltage sampling module, and the temperature value T of the battery module, which is measured by the temperature sampling module, so as to determine the single batteries requiring equilibrium; and the PWM charge controller and the equilibrium gate control modules are controlled by the microcontroller to conduct energy transfer equilibrium on the single batteries requiring equilibrium.

Description

The lithium ion battery management system
Technical field
The utility model relates to the lithium ion battery management system of the high capacity lithium ion battery group of the above series connected battery of two joints such as the demand that is used for electric powered motor lithium-ions battery, communication accumulation of energy high-capacity lithium-ion storage battery and energy-accumulating power station high-capacity lithium-ion storage battery.
Background technology
Lithium ion battery is because the life-span is long, and the large current density electrical characteristics are good, and are safe, memory-less effect, and the corresponding maturation of technology and be considered to the most potential battery, and obtained application.Industry generally believes that monomer lithium ion battery manufacturing technology is mature on the whole, but the lithium ionic cell module that the one of the main reasons of not being used widely so far is made up of the multi-section lithium ion battery is because the consistency of battery is poor, very easily cause a certain or a few cells super-charge super-discharge to occur, cause inefficacy, thereby cause chain reaction, the whole battery group life-span is finished in advance or extreme case under can set off an explosion, catastrophic effect such as on fire, so the lithium ion battery management system is essential.Adopt lithium ion battery protecting plate that battery pack is carried out super-charge super-discharge control and cell is carried out super-charge super-discharge control in the market; Also have the lithium ion battery management system simultaneously integrated equalization function, defencive function and function for monitoring, these have all improved the fail safe and the useful life of lithium ion battery to a certain extent.But existing battery protecting plate or battery management system be ubiquity function singleness, little, not high, the circuit complicated problems of precision of function also, certainly will cause battery pack to reduce useful life, and cost rises, and security of system reduces.
Above-mentioned battery protecting plate or battery management system function singleness, function do not show as very much:
1. battery protecting plate does not have equalization function and other miscellaneous function;
2. battery management system has over-charging of battery to cross to put protection and equalization function, but equalization function adopts the energy consumption mode, and euqalizing current is little, generally in 0.3A, high capacity cell is performed practically no function;
Accurately not high, circuit is complicated shows in the battery voltage sampling, general employing difference amplifier array or linear optical coupling add sends into microcontroller after operational amplifier is handled, because large-capacity battery pack generally all has tens of joints or hundreds of batteries to be composed in series, the circuit complex components is more, certainly will cause cost to rise, stability decreases, simultaneously difference amplifier array is influenced by resistance error and linear optical coupling adds operational amplifier and influenced by the optocoupler linearity, and sampling precision is not high.
The utility model content
Technical problem to be solved in the utility model is to provide that a kind of portfolio effect is good, precision is high, the lithium ion battery management system of good stability.
A kind of lithium ion battery management system of the present utility model comprises: a plurality of battery voltage sampling modules, the magnitude of voltage V of each cell in the measurement battery module in each battery strings; The temperature sampling module is measured the temperature value T of described battery module; Microcontroller receives the magnitude of voltage V of described each cell that described battery voltage sampling module records and the temperature value T of the battery module that the temperature sampling module records, and judging needs balanced cell; PWM charge controller and a plurality of balanced gating control module are subjected to described microprocessor controls to need balanced cell to carry out energy transfer equilibrium to described.
The voltage of described each battery strings is input to described microcontroller by electric resistance partial pressure.
This system also comprises the isolating transformer that is arranged between described PWM charge controller and a plurality of balanced gating control module.
This system also comprises the over-charge protective module; satisfying when overcharging condition, described microprocessor is sent and is overcharged signal and cut off to charging device and charge, and the described condition of overcharging is OC<V* (1+ppm%*T); wherein OC supplements with money for the mistake of supposition, and ppm% is the battery temperature coefficient.
This system also comprised puts protection module; satisfying when putting condition, described microprocessor was sent discharge signal and was cut off discharge to electric discharge device, and the described mistake condition of putting is OV>V* (1+ppm%*T); wherein OV is mistake value of putting of supposition, and ppm% is the battery temperature coefficient.
This system also comprises the overheat protector module, and when satisfying the excess temperature condition, described microprocessor is sent the excess temperature signal and cut off charge and discharge respectively to charging device and electric discharge device, and described excess temperature condition is OT>T, and wherein OT is the excess temperature value of supposition.
This system comprises that also reception is from the discharging current and the output voltage electric current of electric discharge device and be sent to the electric discharge device sampling module of described microprocessor.
This system also comprises the display alarm memory module, and it receives data from described microcontroller with storage and show by digital interface.
Described display alarm memory module is stored described data with compress mode.
This system comprises that also the bus expansion interface that links to each other with described microcontroller is to expand more battery modules by bus mode.
Lithium ion battery management system of the present utility model compared with prior art has following advantage:
1, the utility model formula energy of taking the initiative shifts balancedly, and portfolio effect is 8 times of traditional about 0.3A euqalizing current, and euqalizing current reaches 2.2-2.5A, and energy transfer efficiency reaches more than 80%, thoroughly solves the inconsistent problem of high capacity cell capacity.
2, battery voltage sampling is input to microcontroller by the simple resistor dividing potential drop, make precision in 10mV by external world's calibration and software algorithm, lack 50%-80% than traditional sampling that adds operational amplifier and difference amplifier array with linear optical coupling, save system cost more than 5%, and improved stability.
3, data can be stored battery information amount more than 10 years through overcompression, guarantee the entire cell life cycle, maintenance and improvement to system provide first-hand data, especially under the ripe not enough situation of present lithium ion battery, need lot of data to analyze the failure mode of battery, directly from using terminal to fetch data, than the dangerous chamber of reality carry out multiple simulation and hypothesis testing more direct, clearer, the lifting of battery technology is had immeasurable effect.
Studies show that in a large number that 4, the life-span of battery pack is 1/2 of a cell, even lower, the life-span that the battery protection system of a consummating function can guarantee cell is very near life-span of battery pack.The utility model is integrated lithium ion battery group super-charge super-discharge and cell super-charge super-discharge defencive function, equalization function, battery pack temperature measuring ability, battery electric quantity (SOC) estimation function, monitor alarm function, memory function, modularized design extendable functions, prevents battery generation catastrophic effect to greatest extent and can prolong nearly one times of battery useful life.
Description of drawings
Fig. 1 shows the block diagram that the utility model lithium ion battery management system and external device are electrically connected;
Fig. 2 shows the master control functional-block diagram of the utility model lithium ion battery management system;
Fig. 3 shows the circuit theory diagrams of battery voltage sampling module among Fig. 2;
Fig. 4 shows the circuit theory diagrams of temperature sampling module among Fig. 2;
Fig. 5 shows the circuit theory diagrams of balanced gating control module among Fig. 2.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in detail.
This lithium ion battery management system adopts modularized design, and adopting 16 cell series connection in following examples is a battery strings, and 16 battery strings constitute a battery pack, and promptly battery module can be expanded more battery modules by bus mode.
Fig. 1 shows being electrically connected of the utility model lithium ion battery management system and external device, comprising: master board 1; Bus expansion interface 2; Display alarm memory module 3; Excess temperature signal 4; Cross discharge signal 5; Discharging current and output voltage electric current 6; Electric discharge device 7; Overcharge signal 8; Charging device 9; Battery pack interface 10; Module 111; Module N 12.
Fig. 2 shows the master control functional-block diagram of the utility model lithium ion battery management system, comprising: microcontroller 21; PWM charge controller 22; With 16 battery strings, 16 battery voltage sampling modules one to one, for example battery voltage sampling 123, battery voltage sampling 224 ... battery voltage sampling 1625; Temperature sampling module 26; Electric discharge device sampling module 27; With 16 battery strings, 16 balanced gating control modules one to one, for example balanced gating control 1628 ... balanced gating control 229, balanced gating control 1210; Isolating transformer 211; Output 1212, output 2213 ... output 16214; Battery strings 1215, battery strings 2216 ... battery strings 16217.
The concrete operation principle of the utility model lithium ion battery management system is as follows:
The battery voltage sampling module is used to measure the magnitude of voltage V of each cell of series connection in each battery strings.The voltage of each battery strings is input to microcontroller 21 by electric resistance partial pressure, as shown in Figure 2, and battery voltage sampling totally 16 tunnel.Lift wherein battery strings 1 its principle of explanation: under calibration mode, insert corresponding to battery strings 1,2 ... 16 reference power supply V1, V2 ... V16 records the virtual voltage V1 ' of each battery strings, V2 ' ... V16 ' also deposits in the microcontroller memory; Under the proper testing pattern, insert the battery strings of being managed, record the voltage V1 " V2 " of battery strings ... V16 "; according to magnitude of voltage=V1 "/V1 ' * V1 of cell 1 in the following formula counting cell string 1, magnitude of voltage=the V1 of cell 2 "/V1 ' * V1*2; the rest may be inferred, the magnitude of voltage=V1 of cell 16 "/V1 ' * V1*16.Specifically as shown in Figure 3, each battery voltage sampling module comprises resistance R 1 and the R3 that for example is connected in parallel on the series connection between first and second cell, and the capacitor C 1 in parallel with resistance R 3, simple electric resistance partial pressure only needs three elements can finish a string battery voltage sampling.
The battery pack temperature sampling module specifically as shown in Figure 4, comprises the many groups resistance that is in series and temperature and resistance and electric capacity in parallel with each temperature and resistance in parallel.This battery pack temperature sampling module converts temperature variant each resistance value of temperature and resistance to magnitude of voltage, makes master meter, deposits in the microcontroller memory, draws battery pack temperature value T with lookup table mode during actual the test.
Judge equilibrium condition: the magnitude of voltage V of each cell that obtains from the battery voltage sampling module obtains mean value V A, maximum V Max, minimum value V Min, carry out temperature-compensating again, with the battery pack temperature value T that the temperature sampling module obtains, battery temperature coefficient ppm% (this coefficient can obtain from the electrical specifications that battery manufacturer is recommended) judges whether to satisfy equilibrium condition: V Max* (1+ppm%*T)<set point, V Min* (1+ppm%*T)>set point, V A* (1+ppm%*T)-V* (1+ppm%*T)>set point, the electrical specifications that set point is recommended according to battery manufacturer are set.
Carry out battery balanced: the cell that satisfies above-mentioned equilibrium condition is begun equilibrium, open PWM charge controller 22, by isolating transformer output 1212, output 2213 ... output 16214 ... totally 16 the tunnel export corresponding balanced gating control module (specifically as shown in Figure 5) to, open balanced gating control module, cell to required equilibrium carries out energy transfer equilibrium, and wherein isolating transformer 211 is used for power transfer and electrical isolation.
Judged put, overcharge, the excess temperature condition: according to magnitude of voltage V, temperature value T, the battery temperature coefficient ppm% that the temperature sampling module draws, the mistake value of the putting OV that supposes of the cell of battery voltage sampling module gained, cross and supplement OC, excess temperature value OT with money, judge whether to satisfy: OV>V* (1+ppm%*T), OC<V* (1+ppm%*T), OT>T wherein crosses the value of putting OV, crosses and supplement the electrical specifications setting that OC, excess temperature value OT are recommended according to battery manufacturer with money;
Battery protection: when above-mentioned mistake put, overcharge, when the excess temperature condition is set up respectively, microcontroller 21 was sent discharge signal 5 to electric discharge device 7, cut off discharge; Send and overcharge signal 8 to charging device 9 cut-out chargings; Then cut off charging dress transposition 9 and electric discharge device 7 when sending excess temperature signal 4 respectively.This management system system also comprises electric discharge device sampling module 27; reception is from the discharging current and the output voltage electric current 6 of electric discharge device 7; by sending again behind microprocessor 21 collection analysises; be used to detect the information of battery discharge status and the driving arrangement generation of battery discharge institute; when unusual, can turn-off or optimal control, with protection battery and protection equipment.
By digital interface magnitude of voltage, battery voltage, electric discharge device input current, output voltage, output current and the temperature information transfer of data of the cell that obtains from microcontroller 21 outer reasons are arrived display alarm memory module 3, record also shows.Memory module 3 usefulness surpass the mass storage of 2G, adopt compression function (just not preserving if be that adjacent two values are identical) simultaneously, and record data were reached more than 10 years.
Can expand more multimode by bus expansion interface 2, as module 111, module N 12, and each module comprises other battery strings of expansion, the value from module is passed to primary module realize battery status monitoring display and battery data storage.
Above embodiment only is used for explanation but does not limit the utility model.The utility model also has various deformation and improvement within the scope of the claims.Simple, the equivalence that every foundation claims of the present utility model and description are done changes and modifies, and all falls into the claim protection range of the utility model patent.

Claims (10)

1. a lithium ion battery management system is characterized in that, comprising:
A plurality of battery voltage sampling modules, the magnitude of voltage V of each cell in the measurement battery module in each battery strings;
The temperature sampling module is measured the temperature value T of described battery module;
Microcontroller receives the magnitude of voltage V of described each cell that described battery voltage sampling module records and the temperature value T of the battery module that the temperature sampling module records, and judging needs balanced cell;
PWM charge controller and a plurality of balanced gating control module are subjected to described microprocessor controls to need balanced cell to carry out energy transfer equilibrium to described.
2. the system as claimed in claim 1 is characterized in that, the voltage of described each battery strings is input to described microcontroller by electric resistance partial pressure.
3. the system as claimed in claim 1 is characterized in that, this system also comprises the isolating transformer that is arranged between described PWM charge controller and a plurality of balanced gating control module.
4. the system as claimed in claim 1; it is characterized in that; this system also comprises the over-charge protective module; satisfying when overcharging condition; described microprocessor is sent and is overcharged signal to charging device cut-out charging; the described condition of overcharging is OC<V* (1+ppm%*T), and wherein OC supplements with money for the mistake of supposition, and ppm% is the battery temperature coefficient.
5. the system as claimed in claim 1; it is characterized in that; this system also comprised puts protection module; satisfying when putting condition; described microprocessor was sent discharge signal and was cut off discharge to electric discharge device; the described mistake condition of putting is OV>V* (1+ppm%*T), and wherein OV is mistake value of putting of supposition, and ppm% is the battery temperature coefficient.
6. the system as claimed in claim 1; it is characterized in that; this system also comprises the overheat protector module; when satisfying the excess temperature condition; described microprocessor is sent the excess temperature signal and is cut off charge and discharge respectively to charging device and electric discharge device; described excess temperature condition is OT>T, and wherein OT is the excess temperature value of supposition.
7. the system as claimed in claim 1 is characterized in that, this system comprises that also reception is from the discharging current and the output voltage electric current of electric discharge device and be sent to the electric discharge device sampling module of described microprocessor.
8. the system as claimed in claim 1 is characterized in that, this system also comprises the display alarm memory module, and it receives data from described microcontroller with storage and show by digital interface.
9. system as claimed in claim 8 is characterized in that, described display alarm memory module is stored described data with compress mode.
10. the system as claimed in claim 1 is characterized in that, this system comprises that also the bus expansion interface that links to each other with described microcontroller is to expand more battery modules by bus mode.
CN201120026718XU 2011-01-26 2011-01-26 Lithium ion battery management system Expired - Fee Related CN202019034U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102122832A (en) * 2011-01-26 2011-07-13 陈冠豪 Lithium ion battery management system
CN102621500A (en) * 2012-03-30 2012-08-01 苏州经贸职业技术学院 Charge and discharge detection device for lithium battery
CN104459550A (en) * 2014-11-21 2015-03-25 广西智通节能环保科技有限公司 Storage battery monitoring sensor
CN110165771A (en) * 2019-06-27 2019-08-23 武汉恒泰通技术有限公司 A kind of Switching Power Supply battery management system and method for stabilizing voltage
CN112731163A (en) * 2020-12-10 2021-04-30 上海空间电源研究所 Lithium ion storage battery hand-held type monitoring devices for delivery weapon

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102122832A (en) * 2011-01-26 2011-07-13 陈冠豪 Lithium ion battery management system
CN102621500A (en) * 2012-03-30 2012-08-01 苏州经贸职业技术学院 Charge and discharge detection device for lithium battery
CN104459550A (en) * 2014-11-21 2015-03-25 广西智通节能环保科技有限公司 Storage battery monitoring sensor
CN110165771A (en) * 2019-06-27 2019-08-23 武汉恒泰通技术有限公司 A kind of Switching Power Supply battery management system and method for stabilizing voltage
CN112731163A (en) * 2020-12-10 2021-04-30 上海空间电源研究所 Lithium ion storage battery hand-held type monitoring devices for delivery weapon

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Granted publication date: 20111026

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