CN203722259U - Equalizer circuit of battery pack - Google Patents
Equalizer circuit of battery pack Download PDFInfo
- Publication number
- CN203722259U CN203722259U CN201320692674.3U CN201320692674U CN203722259U CN 203722259 U CN203722259 U CN 203722259U CN 201320692674 U CN201320692674 U CN 201320692674U CN 203722259 U CN203722259 U CN 203722259U
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- battery
- battery pack
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- energy bus
- negative polarity
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Abstract
The utility model discloses an equalizer circuit of a battery pack. The battery pack (1) includes a plurality of single batteries connected in series, an analog switch array (2), a voltage acquisition chip (3), a first energy bus (4), a second energy bus (5), an automatic positive and negative polarity transforming bridge (6), a bidirectional DC/DC direct-current converter (7), a power supply system (8), a proactive and passive selecting switch (9), a MCU control unit (10) and a voltage monitor unit (11). The equalizer circuit structure of the battery pack is simple. The equalization control of a battery in the battery pack is convenient to realize. The pre-stage of the circuit employs a simulation switch array, the battery energy is transmitted to the energy buses, then the energy buses are connected to the bidirectional DC/DC direct-current converter through a positive and negative polarity converting circuit, and the single battery can have energy exchange with a power supply system to achieve a purpose of equalization. The equalizer circuit makes energy sources and batteries independent, and has the advantages of flexible operation and credible system.
Description
Technical field
The utility model belongs to the technical field of battery management system, is specifically related to a kind of equalizing circuit of battery pack.
Background technology
In battery developing history, battery consistency is mentioned always, but never by today, emphasized like this, for real power, stored energy application, up to a hundred the batteries of connecting are very common, and in crosstalks up to a hundred pond, any a string going wrong, can have serious consequences, although can reduce this impact by various pack modes, but an utterly inadequate amount.Be limited by the requirement of fail safe, current high-tension battery group is comprised of LiFePO4 substantially.LiFePO4 production process is used iron material, three kinds of chemical combination states of this element of iron: simple substance, + divalent, + 3 valencys, be easy to transform, even in being considered to cheap lead-acid battery, all extremely abstain from the ferro element of any valence state, because+2, the iron ion of+3 valencys is easy to mutual conversion, even under the obstructed overcurrent situations of battery, easily be oxidized at anode+3 valencys of+2 iron, and be easily reduced in battery cathode+divalent, so the iron of ionic state can be between battery transferring energy, between lithium ion both positive and negative polarity only less than the barrier film of 20 microns, iron ion is easy to be diffused into another one electrode and gets on, so only need the extremely iron ion of trace, just can produce very considerable self discharge electric current.Battery has a lot of inconsistency factors in process of production, and as capacity, internal resistance, temperature susceplibility etc., but the self discharge inconsistency harm that is far from is so large.
The consistency problem of battery becomes high-energy battery maximum bottleneck in the application of high-voltage battery group of ferric phosphate lithium cell and so on.The world was last does not have two duplicate leaves, can not have duplicate battery yet, and the lack of uniformity of battery is absolute, generally needs external circuit to come boosting battery regulating cell state sort circuit to be generally referred to as equalizing system.
Therefore, need a kind of equalizing circuit of lithium ion battery group to address the above problem.
Utility model content
Utility model object: the utility model is for the defect of positive electode of lead battery additive in prior art, provide a kind of can be for the preparation method of the bismuth metal organic frame material of positive electode of lead battery additive.
Technical scheme: for solving the problems of the technologies described above, the preparation method of bismuth metal organic frame material of the present utility model adopts following technical scheme:
A kind of equalizing circuit of battery pack, described battery pack comprises a plurality of single batteries that are connected in series, it is characterized in that, comprise analog switch array, voltage acquisition chip, the first energy bus, the second energy bus, automatic positive-negative polarity Bridge, two-way DC/DC DC converter, electric power system, main quilt is moved selector switch, MCU control unit and voltage monitoring unit, described voltage acquisition chip connects described battery pack and MCU control unit, described the first energy bus connects respectively one end of described single battery, described the second energy bus connects respectively the other end of described single battery, between described the first energy bus and the second energy bus and described battery pack, be provided with described analog switch array, described the first energy bus is all connected described automatic both positive and negative polarity Bridge and voltage monitoring unit with the second energy bus, described voltage monitoring unit connects described MCU control unit, described automatic both positive and negative polarity Bridge connects described two-way DC/DC DC converter, described two-way DC/DC DC converter connects described electric power system, described two-way DC/DC DC converter connects described MCU control unit by the moving selector switch of described main quilt.
Further, described analog switch array is photoMOS photoelectrical coupler.The money photoMOS of Panasonic by low speed forms, at the bottom of thering is switching speed, switch is reliable, the high feature of isolation reliability degree, the LED of the input of this switch produces light, and the photovoltaic cell that light arrives opposite by spacer medium is piled, thereby produces voltage, this voltage promotes the MOS switching tube of two differential concatenations, reaches the effect of similar disconnecting relay.
Further, described automatic positive-negative polarity Bridge comprises two P channel MOSs and two N-channel MOSs.Utilize the boot strap of input voltage to select corresponding MOS conducting, realize the effect of similar full-bridge rectification, and be two-way admittance.
Utility model principle: voltage acquisition chip is by the measurement to battery pack under normal operation, single battery voltage in battery pack is carried to MCU control unit, MCU control unit contrasts by calculating, thereby determine which battery needs by preferential balanced, thereby send the corresponding breakdown action of control command order.If need to carry out the n that is numbered of balanced single battery, so first, MCU control unit can be opened n and two switches of n+1 in analog switch array, through after suitable time-delay, by main quilt, move the energy flow direction that selector switch is controlled two-way DC/DC DC converter, to carry out balanced function.
In the time of certain too high need to the electric discharge of cell voltage, this battery is connected in two-way DC/DC DC converter by analog switch array, automatic positive-negative polarity Bridge, two-way DC/DC DC converter the Energy transfer of battery on electric power system, realized the external electric discharge of this battery, rather than fallen by resistance consumption.
When certain battery occurs that due to reasons such as self discharge height brownout or SOC backwardness need to supplement electricity, this battery is connected in two-way DC/DC DC converter by analog switch array, automatic positive-negative polarity Bridge, two-way DC/DC DC converter is given this battery the Energy transfer of electric power system, charges to this battery.
Beneficial effect: the equalizing circuit of battery pack of the present utility model is simple in structure, can realize very easily the equilibrium of battery in battery pack controls, the prime of circuit adopts analog switch array, the energy content of battery to leading in " energy bus ", by positive-negative polarity change-over circuit, energy bus is connected in a two-way DC/DC DC converter again, make single battery to carry out energy exchange with electric power system and reach balanced object, this equalizing circuit, independent energy source and battery, there is flexible operation, the reliable advantage of system.
Accompanying drawing explanation
Fig. 1 is the structural representation of the equalizing circuit of battery pack of the present utility model;
Fig. 2 is the principle schematic of analog switch array;
Fig. 3 is the structural representation of automatic positive-negative polarity Bridge.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, should understand these embodiment and only for the utility model is described, be not used in restriction scope of the present utility model, after having read the utility model, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present utility model.
Refer to shown in Fig. 1, Fig. 2 and Fig. 3, the equalizing circuit of a kind of battery pack of the present utility model, battery pack 1 comprises a plurality of single batteries that are connected in series, and comprises analog switch array 2, voltage acquisition chip 3, the first energy bus 4, the second energy bus 5, automatic positive-negative polarity Bridge 6, two-way DC/DC DC converter 7, electric power system 8, main quilt moving selector switch 9, MCU control unit 10 and voltage monitoring unit 11.
Voltage acquisition chip 3 connects battery pack 1 and MCU control unit 10.The first energy bus 4 connects respectively one end of single battery, the second energy bus 5 connects respectively the other end of single battery, between the first energy bus 4 and the second energy bus 5 and battery pack 1, be provided with analog switch array 2, the first energy bus 4 and be all connected automatic both positive and negative polarity Bridge 6 and voltage monitoring unit 11 with the second energy bus 4.Wherein, analog switch array 2 is photoMOS photoelectrical coupler.The money photoMOS of Panasonic by low speed forms, at the bottom of thering is switching speed, switch is reliable, the high feature of isolation reliability degree, the LED of the input of this switch produces light, and the photovoltaic cell that light arrives opposite by spacer medium is piled, thereby produces voltage, this voltage promotes the MOS switching tube of two differential concatenations, reaches the effect of similar disconnecting relay.Automatically positive-negative polarity Bridge 6 comprises two P channel MOSs and two N-channel MOSs.Utilize the boot strap of input voltage to select corresponding MOS conducting, realize the effect of similar full-bridge rectification, and be two-way admittance.
Voltage monitoring unit 11 connects MCU control unit 10, automatically both positive and negative polarity Bridge 6 connects two-way DC/DC DC converter 7, two-way DC/DC DC converter 7 connects electric power system 8, and two-way DC/DC DC converter 7 is moved selector switch 9 by main quilt and connected MCU control unit 10.Wherein, two-way DC/DC DC converter 7 is by can power ratio control throughput direction to the control of pin, and the direction that connects automatic both positive and negative polarity utmost point Bridge 6 is the control model that adopts current limiting pressure-limiting.To reach the accurate measurement of balanced electric weight.
Utility model principle: voltage acquisition chip 3 is by the measurement to battery pack 1 under normal operation, single battery voltage in battery pack 1 is carried to MCU control unit 10, MCU control unit contrasts by calculating, thereby determine which battery needs by preferential balanced, thereby send the corresponding breakdown action of control command order.If need to carry out the n that is numbered of balanced single battery, so first, MCU control unit 10 can be opened n and two switches of n+1 in analog switch array 2, through after suitable time-delay, by main quilt, move the energy flow direction that selector switch 9 is controlled two-way DC/DC DC converter 7, to carry out balanced function.
In the time of certain too high need to the electric discharge of cell voltage, this battery is connected in two-way DC/DC DC converter 7 by analog switch array 2, automatic positive-negative polarity Bridge 6, two-way DC/DC DC converter 7 the Energy transfer of battery on electric power system 8, realized the external electric discharge of this battery, rather than fallen by resistance consumption.
When certain battery occurs that due to reasons such as self discharge height brownout or SOC backwardness need to supplement electricity, this battery is connected in two-way DC/DC DC converter 7 by analog switch array 2, automatic positive-negative polarity Bridge 6, two-way DC/DC DC converter 7 is given this battery the Energy transfer of electric power system 8, charges to this battery.
Magnitude of voltage when MCU control unit 10 can be recorded each discharge off and charging termination, in prime program, determining need to be in battery balanced, MCU control unit 10 can recall historical data and contrast, errorless to determine, avoid reciprocal equilibrium, MCU can record the balanced electric weight of every battery accumulation simultaneously, can carry out overall analysis at set intervals, chooses the battery of those micro-short circuit.
Cross the analysis to the fault mode of plural serial stage battery pack, we are divided into three major types type the fault mode of battery pack: one, battery core performance degradation, comprises that reversible capacity decay pattern of anomaly, internal resistance obviously raise, CC percentage minimizing etc.; Two, the damage of battery pack mechanism, comprises loosening, temperature anomaly, water inlet etc.; Three, be SOC difference, do not comprise because self discharge is excessive, temperature is inconsistent, combo flaw etc. do not affect actual battery core capacity and can affect the battery pack fault mode of performance in groups.
The first failure mode, the termination that often means the battery core life-span, no matter which kind of balanced way all can not be repaired battery pack, on the contrary can be because of the robustness of the problem grievous injury BMS systems such as reciprocal balanced, serious heating, for the decline of the property abnormality of battery core self, preferably take the machine of tearing open to replace the mode of battery core.
The second failure mode, irrelevant with this content, will not illustrate.
The third failure mode has been included a lot of fault modes, unified for SOC diversity mode is because these faults can be explained with unified model, and can utilize unified equalization processing method to proofread and correct the SOC state of indivedual batteries.
A kind of new balancing technique scheme has been proposed in to the labor of battery failure fault mode. battery can be regarded the electronic devices and components that capacitive is very large as, for large-sized battery pack, cell voltage did not have a too large variation within several seconds, thereby had left operating space on time shaft " time-sharing multiplex " balanced energy bus.
According to technology of the present utility model, can solve well, the battery performance decline that the third failure mode causes, can detect the second failure mode volume in conjunction with testing circuit and report to the police.
Different from general equilibrium technology, this programme has designed one group of balanced energy bus, and balanced energy bus both can be given the cell shunt of overtension, can give again the cell shunt of brownout.By the electronic switch at each battery two ends, in conjunction with the switching of different control program control switchs, can realize different equalization schemes in any operating state of battery pack, as equalization discharge, charging dynamic equalization, initiatively mends electrical equalization, passive loading sharing etc.
This technology is broken the consistent restriction of series-connected cell current value by being connected to the switch (S1-Sn+1) at each battery two ends, by to record before and after battery, voltage difference, the information states such as current value, open corresponding volume switch, if what need equilibrium is n battery, so just open two switches of Sn and Sn+1, battery is just received on direct current transmitter DC/DC by both positive and negative polarity change over switch like this, then open DC/DC, if battery need to be mended electricity, by external power source, mend electricity to single battery so, if cell voltage is too high, by DC/DC, the unnecessary energy of battery is shifted away so, to realize the different balanced ways of same set of hardware circuit.
Because the positive-negative polarity of energy bus is put upside down conversion along with the difference of battery the unknown of needs equilibrium, between energy bus and DC/DC, design one group of MOS bridge circuit and be used for changing both positive and negative polarity.
In the design of DC/DC, adopt and the diverse control method of traditional DC/DC, the imput output circuit on both sides all adopts the control strategy of efficiency comes first, to reduce the heating of system, further improve the ability of equalization, and output adopts constant current voltage limiting pattern, meet the demand of capacitive load, and the ampere-hour number being at every turn transferred can by well statistics store, as the important evidence of system overhaul.
Abandon that traditional electric capacity drives being connected between battery and equalizing bus bar or the high frequency switch drive mode such as magnetic isolation drive, replacement employing reliability and noise immunity higher light isolation drive mode all, and the power supply of driving switch is also to have photocell to provide, thoroughly high-tension circuit and control circuit are kept apart, avoided the radiation pollution of magnetic isolation, and low frequency switch itself can not produce high-frequency harmonic, EMC characteristic is good, improves the reliability of digital circuit part.Along with the reduction of frequency, switching loss and conduction loss also decrease.
The equalizing circuit of battery pack of the present utility model is simple in structure, can realize very easily the equilibrium of battery in battery pack controls, the prime of circuit adopts analog switch array, the energy content of battery to leading in " energy bus ", by positive-negative polarity change-over circuit, energy bus is connected in a two-way DC/DC DC converter again, make single battery to carry out energy exchange with electric power system and reach balanced object, this equalizing circuit, independent energy source and battery, there is flexible operation, the reliable advantage of system.
Claims (3)
1. the equalizing circuit of a battery pack, described battery pack (1) comprises a plurality of single batteries that are connected in series, it is characterized in that, comprise analog switch array (2), voltage acquisition chip (3), the first energy bus (4), the second energy bus (5), automatic positive-negative polarity Bridge (6), two-way DC/DC DC converter (7), electric power system (8), main quilt is moved selector switch (9), MCU control unit (10) and voltage monitoring unit (11), described voltage acquisition chip (3) connects described battery pack (1) and MCU control unit (10), described the first energy bus (4) connects respectively one end of described single battery, described the second energy bus (5) connects respectively the other end of described single battery, between described the first energy bus (4) and the second energy bus (5) and described battery pack (1), be provided with described analog switch array (2), described the first energy bus (4) is all connected described automatic both positive and negative polarity Bridge (6) and voltage monitoring unit (11) with the second energy bus (4), described voltage monitoring unit (11) connects described MCU control unit (10), described automatic both positive and negative polarity Bridge (6) connects described two-way DC/DC DC converter (7), described two-way DC/DC DC converter (7) connects described electric power system (8), described two-way DC/DC DC converter (7) connects described MCU control unit (10) by the moving selector switch (9) of described main quilt.
2. the equalizing circuit of battery pack as claimed in claim 1, is characterized in that, described analog switch array (2) is photoMOS photoelectrical coupler.
3. the equalizing circuit of battery pack as claimed in claim 1, is characterized in that, described automatic positive-negative polarity Bridge (6) comprises two P channel MOSs and two N-channel MOSs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320692674.3U CN203722259U (en) | 2013-11-06 | 2013-11-06 | Equalizer circuit of battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320692674.3U CN203722259U (en) | 2013-11-06 | 2013-11-06 | Equalizer circuit of battery pack |
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| Publication Number | Publication Date |
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| CN203722259U true CN203722259U (en) | 2014-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320692674.3U Expired - Fee Related CN203722259U (en) | 2013-11-06 | 2013-11-06 | Equalizer circuit of battery pack |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779889A (en) * | 2013-11-06 | 2014-05-07 | 江苏华富储能新技术股份有限公司 | Equalization circuit for battery pack |
| CN105429212A (en) * | 2015-12-01 | 2016-03-23 | 深圳奥特迅电力设备股份有限公司 | Battery pack voltage equalization control circuit and battery management equipment |
| CN108667107A (en) * | 2018-07-17 | 2018-10-16 | 中天钢铁集团有限公司 | A kind of storage battery equalizing circuit and control method including auxiliary battery |
| CN109638926A (en) * | 2019-01-21 | 2019-04-16 | 珠海格力电器股份有限公司 | Compensation circuit for energy storage system, energy storage system and control method |
| CN113783265A (en) * | 2021-09-18 | 2021-12-10 | 上海玫克生储能科技有限公司 | Management system and management method of battery array |
-
2013
- 2013-11-06 CN CN201320692674.3U patent/CN203722259U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779889A (en) * | 2013-11-06 | 2014-05-07 | 江苏华富储能新技术股份有限公司 | Equalization circuit for battery pack |
| CN105429212A (en) * | 2015-12-01 | 2016-03-23 | 深圳奥特迅电力设备股份有限公司 | Battery pack voltage equalization control circuit and battery management equipment |
| CN108667107A (en) * | 2018-07-17 | 2018-10-16 | 中天钢铁集团有限公司 | A kind of storage battery equalizing circuit and control method including auxiliary battery |
| CN108667107B (en) * | 2018-07-17 | 2024-05-28 | 中天钢铁集团有限公司 | Storage battery pack equalization circuit comprising auxiliary battery and control method |
| CN109638926A (en) * | 2019-01-21 | 2019-04-16 | 珠海格力电器股份有限公司 | Compensation circuit for energy storage system, energy storage system and control method |
| CN109638926B (en) * | 2019-01-21 | 2024-08-06 | 珠海格力电器股份有限公司 | Compensation circuit for energy storage system, energy storage system and control method |
| CN113783265A (en) * | 2021-09-18 | 2021-12-10 | 上海玫克生储能科技有限公司 | Management system and management method of battery array |
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Legal Events
| Date | Code | Title | Description |
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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: 20140716 Termination date: 20201106 |
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| CF01 | Termination of patent right due to non-payment of annual fee |