CN103701171A - Equalizing charge control system for battery pack of HEV (Hybrid Electric Vehicle) - Google Patents
Equalizing charge control system for battery pack of HEV (Hybrid Electric Vehicle) Download PDFInfo
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- CN103701171A CN103701171A CN201310717307.9A CN201310717307A CN103701171A CN 103701171 A CN103701171 A CN 103701171A CN 201310717307 A CN201310717307 A CN 201310717307A CN 103701171 A CN103701171 A CN 103701171A
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Abstract
The invention discloses an equalizing charge control system for a battery pack of an HEV (Hybrid Electric Vehicle), which uses a micro controller as the core and is used for controlling each module, carrying out sampling on a voltage, a current and a temperature of the battery pack by a data acquisition module, carrying out communication between a communication module and the micro controller as well as other functional modules, carrying out protection and carrying out equalizing control on the battery pack. By disclosing the equalizing charge control system, the invention has the following functions of: accurately detecting (or displaying) state data of each battery, which comprises a current terminal voltage, a current temperature, a current battery internal resistance and current battery residual capacity of each battery; besides providing overcharge, over-discharge and over-current protection for the lithium ion battery pack, effectively providing balance protection, temperature protection and short circuit protection for charge and discharge of each single battery in the lithium ion battery pack. The equalizing charge control system provided by the invention can be used for carrying out safety monitoring and effective management on the storage battery pack, can improve use efficiency of each storage battery and fulfills the aims of increasing a driving range, prolonging the service life of the battery pack and reducing operation cost, so that reliability of the battery pack is further improved.
Description
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Technical field
The invention belongs to energy-conservation and new-energy automobile field, relate in particular to a kind of hybrid power automobile battery group equalizing charge control system.
Background technology
Along with the fast development of auto industry, the energy and environmental problem are more outstanding.Hybrid vehicle (Hybrid-Electric Vehicle, HEV) is to produce for reducing energy resource consumption and these two problems of caused pollution of fuel-engined vehicle.The general multiple batteries series connection of power lithium-ion battery wherein, and because the aspects such as temperature of each cell in processing and fabricating, initial capacity, voltage, internal resistance and the batteries of each cell are all incomplete same, lack of uniformity between cell is a very harmful factor that affects battery pack work, thereby the external characteristic monitoring of battery pack becomes an electric automobile field key issue urgently to be resolved hurrily.
Summary of the invention
The present invention is directed to problems of the prior art, a kind of hybrid power automobile battery group equalizing charge control system is provided.
Technical scheme of the present invention is specific as follows:
A hybrid power automobile battery group equalizing charge control system, comprise microcontroller for controlling whole system, be used to whole hybrid power automobile battery group equalizing charge control system the power module of electric energy, the communication module for microcontroller and other module communications, memory module are provided, for the data acquisition module of battery voltage sampling, current sample and temperature sampling, for the protection module of over-charge protective, Cross prevention and temperature protection, for realizing the balance module of cell balance charge/discharge.
A current spike while preventing that hybrid vehicle from starting is set in described power module and subsequent conditioning circuit is produced to the common mode inductance destroying.
Described data acquisition module comprises voltage acquisition module, current acquisition module and temperature collect module.
The mode of described data acquisition module voltage sample, comprises the steps: first to lead to over-sampling number mould converter and gathers monomer battery voltage signal, and then by each voltage signal collecting, the mode by gating switch transfers in microcontroller.
Described communication module adopts serial communication and two kinds of communication patterns of CAN bus communication.
The present invention is strategy and the stand-by power supply strategy that has proposed many grouping managements with respect to the advantage of prior art, has analyzed the limitation of many grouping managements strategy, has pointed out to use in HEV occasion the reasonability of stand-by power supply strategy.The control method that adopts this strategy mainly to comprise the principle of battery group and discharge and recharge etc.Analysis of experimental data shows, adopts this energy management strategy can effectively improve the working condition that is managed battery pack.
Batteries management system provided by the invention can carry out security monitoring and effectively management to batteries, can improve the service efficiency of storage battery, reach increase continual mileage, extend its useful life, reduce the object of operating cost, thereby further improve the reliability of battery pack.
Accompanying drawing explanation
Fig. 1 is hardware global design block diagram.
Fig. 2 is power module schematic diagram.
Fig. 3 is voltage sample mould/number conversion circuit diagram.
Fig. 4 is additives for overcharge protection circuit diagram; Wherein, (a) be S-8242 additives for overcharge protection circuit; (b) be S-8254 additives for overcharge protection circuit.
Fig. 5 is over circuit diagram; Wherein, (a) be S-8242 over circuit; (b) be S-8254 over circuit.
Fig. 6 is the balanced driver module schematic diagram of controlling.
Fig. 7 is for improving the performance comparison figure of equalizing circuit.
Embodiment
For content of the present invention is more easily expressly understood, below according to concrete embodiment and by reference to the accompanying drawings, the present invention is further detailed explanation.
The invention provides a kind of test lithium ion battery group, this battery pack comprises the monomer lithium ion battery that the rated voltage of 100 series connection is 3.8V, these 100 cells are divided into 4 casees, then 25 battery cells in every case are divided into 5 groups, every 5 battery cells are a small group.
Because battery pack unbalanced has very strong randomness, in battery pack, both likely there is the battery that dump energy is low, also likely have the battery that dump energy is high, therefore, high performance balanced management system should possess charge balancing function also will possess equalization discharge function.
Hybrid power automobile battery group equalizing charge control system provided by the invention, as shown in Figure 1, comprises micro controller module (MCU), power module, communication module, memory module, data acquisition module, protection module and balance module.
(1) power module
As shown in Figure 2, this battery management system adopts vehicle-mounted 24V storage battery power supply to the power module of this battery management system, and MCU operating voltage is 1.5V, and peripheral interface voltage is 3.3V.In Fig. 2, Dl is counnter attack diode, and insurance F can disconnect system and power supply rapidly when short circuit; Common mode inductance COM is that the current spike when preventing that HEV from starting produces and destroys subsequent conditioning circuit; D2, C1 work to absorb immediate current spike; Fig. 2 the right the first half produces 1.8V voltage, and the latter half produces 3.3V voltage; LM1117 is DC/DC conversion chip.
(2) data acquisition module
Voltage sample: voltage sample mould/number conversion circuit of the present invention as shown in Figure 3, the present invention carries out differential mode measurement by the mode of gating switch to monomer battery voltage, first logical over-sampling number mould converter collects voltage signal, each voltage signal gathering is transferred in MCU by gating switch, finally demonstrate magnitude of voltage.Whole voltage collection circuit sends control signal by MCU, every case battery adopts 20 displacement gating switch timesharing gating circuits, the every a small group positive and negative electrode of battery is connected, therefore only needs 4 control signal wires, just can carry out voltage sample to all batteries in circuit.In each sampling instant, every case battery adopts 20 displacement gating switches, gathers altogether four voltage signals.Adopt CS5461A as voltage sample analog-digital chip.The signal that cell end collects transfers to before sampling A/D chip, first by R1, R2, R3 precision resister, is depressurized to certain limit, completes after analog-to-digital conversion, and the voltage signal after conversion is transferred in MCU by photoelectric coupler isolation.
Current sample: adopt hall sensor that sampled signal is transferred to CS5461A and carry out analog-to-digital conversion, and the signal after conversion is transferred to MCU, pass through photoelectric coupler isolation between CS5461A and MCU.
Temperature sampling: adopt Distributed Multi thermometric mode to carry out thermometric to circuit, place 3 DS1822 type temperature sensors in each battery case, place altogether 12 DS1822 type temperature sensors for 4 casees; Every 6 temperature sensors are connected in a bus, and MCU and temperature sensor to prevent interference, add drive circuit with actuation temperature transducer after photoelectrical coupler by photoelectric coupler isolation.
(3) communication module
Communication module mainly adopts serial communication and CAN bus communication: serial communication is mainly responsible for and the communicating by letter of host computer, comprise the setting, transmitting system service data of system initial value etc., the communication interface that adopts MAX232 transducer mutually to change the RS232 level signal of the Transistor-Transistor Logic level signal of MCU end and upper computer end; The interface chip that CAN bus communication adopts MCP2551 chip to be connected with physical bus as CAN controller.
(4) protection module
Protection module is mainly responsible for over-charge protective, Cross prevention and temperature protection.The terminal voltage of each cell of Real-Time Monitoring, when monomer voltage surpasses regulation high voltage, starts overcharge protection, and protective circuit is cut off charge circuit, ends charging; When monomer voltage during low-voltage, starts deep-discharge protection lower than regulation, protective circuit is communicated with charge circuit, starts charging; When temperature is during higher than design temperature, automatically open radiating mode.
Fig. 4 and Fig. 5 are respectively battery overcharge and over circuit, and series system can carry out over-charge protective to a Battery pack.Wherein S-8242 is two joint Li battery protection ICs, and S-8254 is three joints or four joint Li battery protection ICs.
In S-8242, pin 4 connects the negative pole of battery b, pin 5 connects the negative pole of battery a, and it is anodal that pin 6 connects battery supply, and pin 8 is super-charge super-discharge detection pin, pin one (CO, charging is controlled with FET gate pole splicing ear) connect to overcharge and control MOSFET, when occurring overcharging, be to be height, pin two (DO, FET gate pole splicing ear for control of discharge) connecting and put control MOSFET, is to be height when occurring putting.
In S-8254, pin one 0 connects the battery mode base pin selection of battery c, battery d, pin one 3 connects battery c negative pole, and pin one 4 connects battery b negative pole, and pin one 5 connects the negative pole of battery a, it is anodal that pin one 6 connects battery supply, pin two is that super-charge super-discharge detects pin, and pin one connects to overcharge controls MOSFET, when occurring overcharging, is to be height, pin 3 connected to put controls MOSFET, when occurring putting, is to be height.
(5) balance module
The MOSFET driving circuit principle of balanced control module: mainly adopt voltage-controlled type pulse modulator to produce PWM ripple, be sent to MOSFET chip after optocoupler, to control switch mosfet pipe, discharge and recharge thereby control balance module.Fig. 6 is balanced control module MOSFET drive circuit, and this circuit can make the rapid conducting of switch and shutoff.Wherein thereby signal PWM-D regulates PWM waveform to control switch mosfet pipe by SG3535 according to feedback voltage; 6N137 is the isolation on electric for switching tube and governor circuit; SN7404 chip is used for improving drive current, reduces switching loss and chopped pulse rise and fall time; IR2102 is the special chip of driven MOS FET; On LO pin, export PWM ripple driven MOS FET; Load is the control output of MOSFET.
(6) efficiency assay:
In order to verify operation principle and the efficient balance of the improvement DC-DC equalization charging circuit of equalizing charge control system proposed by the invention, balanced interlock circuit is tested.To four battery pack that are connected into by lithium ion battery, with equalizing circuit proposed by the invention, carry out equalizing charge.As can be seen from Figure 7, before equalizing charge, the SOC of the cell of undercharge and other cells differ 20% left and right, and equalizing charge is after 70 minutes, and the voltage convergence of each monomer is consistent, and SOC differs and is no more than 2%.This explanation, equalizing charge control system proposed by the invention has all fills performance preferably.
Above-described specific embodiment; object of the present invention, technical scheme and useful result have been carried out to further detailed description; institute is understood that; the foregoing is only instantiation of the present invention; be not limited to the present invention; all in the spirit and principles in the present invention and so on, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a hybrid power automobile battery group equalizing charge control system; it is characterized in that, comprise microcontroller for controlling whole system, be used to whole hybrid power automobile battery group equalizing charge control system the power module of electric energy, the communication module for microcontroller and other module communications, memory module are provided, for the data acquisition module of battery voltage sampling, current sample and temperature sampling, for the protection module of over-charge protective, Cross prevention and temperature protection, for realizing the balance module of cell balance charge/discharge.
2. equalizing charge control system according to claim 1, is characterized in that, a current spike while preventing that hybrid vehicle from starting is set in described power module and subsequent conditioning circuit is produced to the common mode inductance destroying.
3. equalizing charge control system according to claim 1, is characterized in that, described data acquisition module comprises voltage acquisition module, current acquisition module and temperature collect module.
4. equalizing charge control system according to claim 1, it is characterized in that, the mode of described data acquisition module voltage sample, comprise the steps: first to lead to over-sampling number mould converter and gather monomer battery voltage signal, then by each voltage signal collecting, the mode by gating switch transfers in microcontroller.
5. equalizing charge control system according to claim 1, is characterized in that, described communication module adopts serial communication and two kinds of communication patterns of CAN bus communication.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633940A (en) * | 2014-11-28 | 2016-06-01 | 中国科学院沈阳自动化研究所 | Starting power supply system for unmanned helicopter |
| CN106602650A (en) * | 2016-12-22 | 2017-04-26 | 天津力神特种电源科技股份公司 | Power charging protection device for eight strings of batteries being charged in parallel connection |
| CN106655412A (en) * | 2017-02-27 | 2017-05-10 | 深圳市嘉洋电池有限公司 | Battery system |
| CN107054110A (en) * | 2016-11-18 | 2017-08-18 | 德阳九鼎智远知识产权运营有限公司 | A kind of cell management system of electric automobile and management method |
| CN107359662A (en) * | 2017-08-01 | 2017-11-17 | 华南理工大学 | A kind of battery management system and equalization methods with parallel equalization function |
| WO2019042440A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery balancing system, vehicle, battery balancing method, and storage medium |
| CN109910681A (en) * | 2019-01-23 | 2019-06-21 | 江苏敏安电动汽车有限公司 | A kind of BMS active equalization control system for electric vehicle |
| CN110829537A (en) * | 2019-11-21 | 2020-02-21 | 四川长虹电源有限责任公司 | Charging management system for aviation lithium battery pack |
| CN111123134A (en) * | 2020-01-14 | 2020-05-08 | 东南大学 | Marine lithium battery health management system based on multilevel temperature monitoring and internal resistance measurement and calculation |
| CN111404233A (en) * | 2020-04-22 | 2020-07-10 | 安徽星玛新能源有限公司 | Battery management system |
| US11292360B2 (en) | 2017-08-31 | 2022-04-05 | Byd Company Limited | Battery equalization method and system, vehicle, storage medium, and electronic device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105633940A (en) * | 2014-11-28 | 2016-06-01 | 中国科学院沈阳自动化研究所 | Starting power supply system for unmanned helicopter |
| CN107054110A (en) * | 2016-11-18 | 2017-08-18 | 德阳九鼎智远知识产权运营有限公司 | A kind of cell management system of electric automobile and management method |
| CN106602650A (en) * | 2016-12-22 | 2017-04-26 | 天津力神特种电源科技股份公司 | Power charging protection device for eight strings of batteries being charged in parallel connection |
| CN106655412A (en) * | 2017-02-27 | 2017-05-10 | 深圳市嘉洋电池有限公司 | Battery system |
| CN107359662A (en) * | 2017-08-01 | 2017-11-17 | 华南理工大学 | A kind of battery management system and equalization methods with parallel equalization function |
| CN107359662B (en) * | 2017-08-01 | 2023-06-20 | 华南理工大学 | Battery management system with parallel equalization function and equalization method |
| US11292360B2 (en) | 2017-08-31 | 2022-04-05 | Byd Company Limited | Battery equalization method and system, vehicle, storage medium, and electronic device |
| WO2019042440A1 (en) * | 2017-08-31 | 2019-03-07 | 比亚迪股份有限公司 | Battery balancing system, vehicle, battery balancing method, and storage medium |
| US11571981B2 (en) | 2017-08-31 | 2023-02-07 | Byd Company Limited | Battery equalization system, vehicle, battery equalization method and storage medium |
| CN109910681A (en) * | 2019-01-23 | 2019-06-21 | 江苏敏安电动汽车有限公司 | A kind of BMS active equalization control system for electric vehicle |
| CN110829537A (en) * | 2019-11-21 | 2020-02-21 | 四川长虹电源有限责任公司 | Charging management system for aviation lithium battery pack |
| CN111123134A (en) * | 2020-01-14 | 2020-05-08 | 东南大学 | Marine lithium battery health management system based on multilevel temperature monitoring and internal resistance measurement and calculation |
| CN111404233A (en) * | 2020-04-22 | 2020-07-10 | 安徽星玛新能源有限公司 | Battery management system |
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Application publication date: 20140402 |