CN203617759U - Lithium ion battery pack energy management system suitable for wireless sensor - Google Patents
Lithium ion battery pack energy management system suitable for wireless sensor Download PDFInfo
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- CN203617759U CN203617759U CN201320829830.6U CN201320829830U CN203617759U CN 203617759 U CN203617759 U CN 203617759U CN 201320829830 U CN201320829830 U CN 201320829830U CN 203617759 U CN203617759 U CN 203617759U
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Abstract
The utility model discloses a lithium ion battery pack energy management system suitable for a wireless sensor, and in particular relates to an equalization circuit capable of energy transfer in a series-connected battery pack by use of an energy storage capacitor. The circuit includes a pack of lithium ion batteries connected in series, each battery corresponding to a comparator; and a voltage dividing branch consisting of two equivalent resistors, the circuit being used for sampling average voltage of the battery pack and transmitting an average voltage value as reference voltage to an input end of each comparator. An output end of each comparator is connected to a field effect transistor of each corresponding equalization branch. When a high voltage battery cell exists in the battery pack, the corresponding comparator outputs high voltage, the corresponding equalization branch is conducted, the energy storage capacitor absorbs energy of the high voltage battery until the voltage drops to the average value, then another equalization branch is conducted, the energy storage capacitor discharges to a low voltage battery, and the above operation is repeated by the equalization circuit until voltage of each battery cell in the series-connected battery pack becomes equal. The circuit is of simple structure and low cost, equalized energy in the battery pack can be quickly achieved, all energy storage of the battery pack can be used in a maximized manner for energy supply for a wireless sensor, and the service life of the circuit is extended.
Description
Technical field
The utility model discloses a kind of lithium ion battery group EMS that is applicable to wireless senser, particularly a kind of equalizing circuit that utilizes storage capacitor to realize series battery electric energy transfer.
Background technology
Wireless sensor network is with a wide range of applications in fields such as environmental monitoring, Smart Home, communications and transportation, precision agricultures, is more and more subject to people's attention.Sensor node, as the important composition unit of wireless sensor network, intersperses among the information of assisting Real-Time Monitoring, perception and the various environment of collection and monitoring target in certain region conventionally.Sensor node work condition environment has in actual applications determined that node power in most cases cannot access normal electric power system.If the MICAz node of for example Crossbow company adopts the battery of 3000mAh to be arranged on for 1% work period, but just need to change primary cell every 17 weeks.In addition because node is often disposed in severe and complex environment, further increased the cost of changing battery.Make full use of whole energy of battery pack, extending its working life just becomes the key issue of sensor node design.
Since lithium ion battery is succeeded in developing, because it has, specific energy is high, operating voltage is high, without memory, self-discharge rate is low, have extended cycle life, the unique advantage such as pollution-free, has now been widely used in wireless senser field.The working end voltage of common lithium ion battery generally, between 3.6～4.1V, due to the difference of node load to supply voltage and power demand, is connected multiple lithium ion batteries in groups as supply unit conventionally.But lithium ion battery is due to the difference of self chemical characteristic and work condition environment, in battery pack, the performance such as capacity, internal resistance of cell is inconsistent, causes weak body battery to determine battery pack overall performance.In order to make full use of the inner all energy of battery pack, prevent weak body over-charging of battery or after the to one's heart's content generation of condition, cause battery pack to shift to an earlier date power cut-off, therefore supply unit is carried out to balancing energy and seem very necessary.
Summary of the invention
The defect and the deficiency that exist for above-mentioned prior art, the purpose of this utility model is, a kind of lithium ion battery group EMS that is applicable to wireless senser is provided, the utility model can be realized all monomer battery voltages in energy supply battery pack and be consistent, prevent that weak body battery discharging in advance or charging from finishing to cause series battery to work, the dump energy of other normal battery in the battery pack that avoids waste, has extended operating time of wireless senser greatly.
In order to realize above-mentioned task, the utility model adopts following technical solution:
A lithium ion battery group EMS that is applicable to wireless senser, is characterized in that, comprises series battery, bleeder circuit, comparator control circuit, equalizing circuit and storage capacitor C, and described battery pack is in series by battery B1 and B2; Described bleeder circuit is in series with R2 by resistance R 1, and dividing point road is connected on the positive and negative two ends of battery pack; Described comparator control circuit is made up of comparator C OMP1, COMP2,3 ends of described comparator C OMP1 and 6 ends of COMP2 are connected between resistance R 1 and R2 simultaneously, 2 ends of comparator C OMP1 and 7 ends of COMP2 are connected to the positive pole of battery B2 simultaneously, the 10 end ground connection of 4 ends of described comparator C OMP1 and COMP2,5 ends of comparator C OMP1 and 9 ends of COMP2 are received the positive pole of battery pack simultaneously by resistance R 3; Described equalizing circuit is made up of field effect transistor Q1, Q2, Q3, Q4, the gate pole G of described Q1 and Q3 is connected to 1 end of comparator C OMP1 simultaneously, the gate pole G of described Q2 and Q4 is connected to 8 ends of comparator C OMP2 simultaneously, the drain D of described field effect transistor Q1 connects the positive pole of battery pack, the drain D of described field effect transistor Q2 connects the positive pole of capacitor C, the source S of effect pipe Q2 connects the positive pole of battery B2, the drain D of described field effect transistor Q3 connects the positive pole of battery B2, the drain D of described field effect transistor Q4 connects the negative pole of battery pack, and the source S of field effect transistor Q4 connects the negative pole of battery B2; The positive pole of described storage capacitor C connects the source S of field effect transistor Q1, and the negative pole of storage capacitor C connects the source S of field effect transistor Q3.
The beneficial effects of the utility model are:
Due to the difference of the operating mode of cell in lithium ion battery group, environment, temperature, chemical characteristic, easily there is the inconsistent phenomenon of energy in lithium ion battery group inside, show as cell voltage fluctuation, the voltage of battery B1 higher than the voltage of battery B2 or battery B2 higher than B1.Now, if do not carry out balancing energy, the dispersion of voltage and energy, by increasing, finally causes low-voltage battery discharging in advance to finish, and series-connected cell cannot work on, and also has a large amount of dump energies all to waste in high-voltage battery.
When the energy of battery B1 is during higher than the energy of B2, be that the voltage of battery B2 is lower than battery pack mean value, now comparator C OMP1 is output as high voltage, be connected to field effect transistor Q1 and the Q3 conducting of the output of COMP1, battery B1 and capacitor C form loop, battery B1 starts capacitor C to carry out charging process, the voltage of capacitor C constantly rises and the voltage of battery B1 constantly declines until the voltage of B1 lower than battery pack average voltage.At this moment, COMP1 output becomes low level, the output of COMP2 becomes high level, be connected to field effect transistor Q2 and the Q4 conducting of the output of COMP2, battery B2 and capacitor C form loop, capacitor C starts battery B2 to charge, the energy that is stored in capacitor C is transferred in battery B2, battery B2 voltage and energy constantly rise and the voltage of capacitor C constantly declines, high energy battery B1 is also in open-circuit condition, the voltage of battery B1 constantly rises and returns to higher than average voltage, comparator control circuit constantly repeats the lasting energy by B1 of above-mentioned process and transfers in battery B2, until the energy of two batteries and voltage are very approaching, be that battery pack power is at equilibrium.When the energy of battery B2 is during higher than the energy of B1, when the voltage of battery B2 is higher than battery pack mean value, above-mentioned similar of balancing procedure.
This circuit structure is simple, with low cost, can automatically realize fast the balancing energy of battery pack inside, make full use of the energy of each monomer in battery pack, prevent from weak body over-charging of battery or cross putting, cause battery pack to shift to an earlier date complete charge or power supply, fully extend the operating time of wireless senser.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments the utility model is further explained explanation.
Fig. 1 is circuit theory diagrams;
Fig. 2 is battery terminal voltage sampling curve in balancing procedure.
In Fig. 1, B1, B2 are lithium ion battery, and COMP1, COMP2 are comparator, and Q1, Q2, Q3, Q4 are field effect transistor, and C is storage capacitor, and R1, R2, R3 are resistance.
In Fig. 2, B1_Vo tage be the terminal voltage sampling curve of high-voltage battery B1, B2_Voltage is the terminal voltage sampling curve of low-voltage battery B2.
Embodiment
In Fig. 1, the dividing potential drop branch road being made up of substitutional resistance R1, R2, divides equally the voltage of series battery, and is transported to the input of each comparator using average voltage as reference voltage.The positive termination battery pack average voltage of comparator C OMP1, negative terminal connects the positive pole of battery B2, in the time that the voltage of battery pack B1 is greater than the voltage of battery B2, comparator C OMP1 is output as high voltage, corresponding field effect transistor Q1 and Q3 conducting, high-tension battery B1 is capacitor C charging, and now the terminal voltage of B1 starts to decline, until the terminal voltage of B1 is less than the terminal voltage of B2.Due to the positive pole of the positive termination battery B2 of comparator C OMP2, negative terminal connects battery pack average voltage, in the time that the terminal voltage of B1 is less than the terminal voltage of B2, be the voltage that the average voltage of battery pack is less than B2, comparator C OMP2 output HIGH voltage, corresponding field effect transistor Q2 and Q4 conducting, the energy that is stored in capacitor C is transferred in battery B2, at this moment battery B1 open circuit, voltage constantly recovers until higher than battery B2, comparator C OMP2 output LOW voltage, and COMP1 starts output HIGH voltage, constantly repetitive cycling said process, in the time that the voltage of battery B1 and B2 approaches very much, equalizing system quits work.
In Fig. 2, B1_Voltage is the terminal voltage sampling curve of high-voltage battery B1, B2_Voltage is the terminal voltage sampling curve of low-voltage battery B2, after system starts equilibrium, high-voltage battery voltage constantly declines, and low-voltage battery constantly rises, after equilibrium after a while, the difference of the magnitude of voltage of two batteries is less than system and starts threshold values, has completed the balancing procedure of lithium ion battery group, and field effect transistor is selected the IPG20N04 model of company of Infineon.
Claims (3)
1. one kind is applicable to the lithium ion battery group EMS of wireless senser, it is characterized in that, comprise series battery, bleeder circuit, comparator control circuit, equalizing circuit and storage capacitor (C), described battery pack is in series by battery (B1) and battery (B2); Described bleeder circuit is in series by substitutional resistance (R1) and resistance (R2), and bleeder circuit is connected on the positive and negative two ends of battery pack; Described comparator control circuit is made up of comparator (COMP1), comparator (COMP2), 3 ends of described comparator (COMP1) and 6 ends of comparator (COMP2) are connected between resistance (R1) and resistance (R2) simultaneously, and 7 ends of 2 ends of comparator (COMP1) and comparator (COMP2) are connected to the positive pole of battery (B2) simultaneously; Described equalizing circuit is made up of field effect transistor (Q1), field effect transistor (Q2), field effect transistor (Q3), field effect transistor (Q4), the gate pole (G) of described field effect transistor (Q1) and field effect transistor (Q3) is connected to 1 end of comparator (COMP1) simultaneously, and the gate pole (G) of described field effect transistor (Q2) and field effect transistor (Q4) is connected to 8 ends of comparator (COMP2) simultaneously; The positive pole of described storage capacitor (C) connects the source electrode (S) of field effect transistor (Q1), and the negative pole of storage capacitor (C) connects the source electrode (S) of field effect transistor (Q3).
2. a kind of lithium ion battery group EMS that is applicable to wireless senser according to claim 1, it is characterized in that, 4 ends of described comparator (COMP1) and 10 end ground connection of comparator (COMP2), 9 ends of 5 ends of comparator (COMP1) and comparator (COMP2) are received the positive pole of battery pack simultaneously by resistance (R3).
3. a kind of lithium ion battery group EMS that is applicable to wireless senser according to claim 1, it is characterized in that, the drain electrode (D) of described field effect transistor (Q1) connects the positive pole of battery pack, the drain electrode (D) of described field effect transistor (Q2) connects the positive pole of electric capacity (C), the source electrode (S) of effect pipe (Q2) connects the positive pole of battery (B2), the drain electrode (D) of described field effect transistor (Q3) connects the positive pole of battery (B2), the drain electrode (D) of described field effect transistor (Q4) connects the negative pole of battery pack, the source electrode (S) of field effect transistor (Q4) connects the negative pole of battery (B2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320829830.6U CN203617759U (en) | 2013-12-17 | 2013-12-17 | Lithium ion battery pack energy management system suitable for wireless sensor |
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| CN201320829830.6U CN203617759U (en) | 2013-12-17 | 2013-12-17 | Lithium ion battery pack energy management system suitable for wireless sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103855762A (en) * | 2013-12-17 | 2014-06-11 | 北京建筑大学 | Lithium ion battery pack energy management system applied to wireless sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103855762A (en) * | 2013-12-17 | 2014-06-11 | 北京建筑大学 | Lithium ion battery pack energy management system applied to wireless sensor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140528 Termination date: 20151217 |
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| EXPY | Termination of patent right or utility model |