CN104466917A - Electric vehicle lithium battery management system - Google Patents
Electric vehicle lithium battery management system Download PDFInfo
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- CN104466917A CN104466917A CN201410644040.XA CN201410644040A CN104466917A CN 104466917 A CN104466917 A CN 104466917A CN 201410644040 A CN201410644040 A CN 201410644040A CN 104466917 A CN104466917 A CN 104466917A
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Abstract
The invention discloses an electric vehicle lithium battery management system. One end of the management system is connected with a battery pack, the other end of the management system is connected with a load, the management system comprises a primary protecting circuit and a secondary protecting circuit, the primary protecting circuit is connected with a discharging MOS transistor and a charging MOS transistor, the discharging MOS transistor and the charging MOS transistor are connected in series at the two ends of the battery pack and the load, the secondary protecting circuit is connected with a fuse, and the fuse is connected with the discharging MOS transistor and the charging MOS transistor in series. The electric vehicle lithium battery management system has a dual safety protection function, the secondary protecting circuit is open when the primary protecting circuit loses efficacy so that the battery pack can stop work and safety is improved. The management system is simple in structure and high in practicability.
Description
Technical field
The present invention relates to battery of electric vehicle security fields, refer in particular to a kind of lithium battery management system for electric car.
Background technology
At present, in the lithium battery group of electric vehicle, all there is battery management system, and in battery management system, often adopt the effective switch of doing of N-MOS to use, to realize overcharging lithium battery group, cross put, overcurrent, the protection such as short circuit.But due to management system electronic circuit there is certain failure rate, N-MOS pipe exists and certain punctures possibility, so when management system lost efficacy, lithium battery group will lose protection, occurs potential safety hazard.China Patent Publication No. CN 103094886A, publication date on May 8th, 2013, disclose a kind of based on monolithic processor controlled electric vehicle lithium battery group protection system in the patent of invention that name is called " a kind of based on monolithic processor controlled electric vehicle lithium battery group protection system ", comprise single-chip microcomputer, high power switch module, equalizing charge module, voltage sample module, A/D sampling module, current sample module, temperature-measuring module, balanced group module and lithium battery pack module, described battery voltage, electric current, the information such as temperature pass through voltage sample, current sample and temperature measuring circuit, be added to the A/D input of signals collecting part, the analog signal of input is converted to digital signal by A/D module, and is transferred to single-chip microcomputer.Weak point is, this protection system can only detect lithium battery group is abnormal, and can not process accordingly, and this protection system is comparatively complicated, cost is higher.
Summary of the invention
The object of the invention is to overcome lithium battery group protective circuit in prior art comparatively single, once lose efficacy, lithium battery can lose protection, there is the defect of potential safety hazard, provided a kind of lithium battery management system for electric car with dual safety safeguard function.
The object of the invention is to be achieved by following technical proposals:
A kind of lithium battery management system for electric car; management system one end is connected with battery pack; the other end of management system is connected with load; management system comprises first class of protection circuit and safe secondary protection circuit; first class of protection circuit connects electric discharge metal-oxide-semiconductor and charging metal-oxide-semiconductor simultaneously; electric discharge metal-oxide-semiconductor and charging metal-oxide-semiconductor are connected on the two ends of battery pack and load, and safe secondary protection circuit is connected with fuse, and fuse is connected with electric discharge metal-oxide-semiconductor and the metal-oxide-semiconductor that charges.
As a kind of preferred version, safe secondary protection circuit comprises MCU, N-MOS pipe Q1, NPN triode Q2, controllable silicon, MCU controls the one end exporting I/O port contact resistance R1, the other end of resistance R1 is connected with the grid of N-MOS pipe Q1, the source class ground connection of N-MOS pipe Q1, the drain electrode of N-MOS pipe Q1 is connected with one end of resistance R2, the base stage of the other end connecting triode Q2 of resistance R2, the collector electrode of triode Q2 with for driving the voltage VCC of controlled silicon conducting to be connected, voltage VCC is also connected with one end of resistance R3, the other end of resistance R3 is connected with the base stage of triode Q2, the emitter of triode Q2 is connected with silicon controlled control end, silicon controlled anode is connected with the positive pole of battery pack, silicon controlled negative electrode is connected with one end of fuse and the negative pole of load.
Under normal condition; first class of protection circuit protected cell group normally works; when battery voltage is higher than one-level overcharged voltage or lower than one-level overdischarge pressure; management system meeting charge closing metal-oxide-semiconductor or electric discharge metal-oxide-semiconductor, to stop charge or discharge, protection battery pack; when battery voltage is higher than secondary over-charge protective voltage or lower than secondary Cross prevention voltage; then MCU thinks that first class of protection circuit one-level lost efficacy, and start second class protection, MCU exports high level.Described N-MOS pipe Q1 and the object combinationally used of triode Q2 meet low-voltage to control high voltage.After MCU exports high level, voltage is by the grid of resistance R1 to N-MOS pipe Q1, and N-MOS pipe Q1 will conducting, and then the base stage of triode Q2 is because of the dividing potential drop of resistance R2 and resistance R3, the collector electrode of triode Q2 and the base stage of triode Q2 will form bias voltage, make triode Q2 conducting.After triode Q2 conducting, voltage VCC voltage can pass through silicon controlled control end, makes controlled silicon conducting; After controlled silicon conducting, battery pack will pass through controllable silicon, fuse forms broken circuit, and because short circuit current is excessive, fuse can fuse instantaneously, and when after blown fuse, controllable silicon, owing to not having loop (maintenance) electric current, will be closed.By with upper type, make the blown fuse of lithium battery group and load circuit, when first class of protection lost efficacy, battery pack also can quit work, and ensured safety.
As a kind of preferred version, resistance R4 and diode D1 is also connected with between the emitter of triode Q2 and SCR control end, the emitter of triode Q2 is connected with one end of resistance R4, the other end of resistance R4 is connected with the anode of diode D1, and the negative electrode of diode D1 is connected with SCR control end.Resistance R4 and diode D1 plays a protective role, and prevents other components and parts such as infringement MCU such as controllable silicon reversal connection.
As a kind of preferred version, between the source electrode of N-MOS pipe and drain electrode, also reversal connection in parallel has diode.
As a kind of preferred version, controllable silicon relay substitutes.Relay can complete silicon controlled function, and after voltage VCC exports high level, relay becomes conducting state by off-state, blows a fuse.
A kind of electric motor car, comprises the lithium battery management system for electric car of claim 1 to 5 described in any one.
The invention has the beneficial effects as follows, lithium battery management system for electric car has dual safety protection, and when first class of protection circuit malfunction, safe secondary protection circuit makes loop disconnect, and battery pack is quit work, improves fail safe.And structure of the present invention is simple, practical.
Accompanying drawing explanation
Fig. 1 is a kind of circuit theory connection layout of the present invention;
Fig. 2 is the partial enlarged drawing of Fig. 1 safe secondary protection circuit part.
Wherein: 1, battery pack, 2, management system, 3, load, 4, first class of protection circuit, 5, safe secondary protection circuit, 6, electric discharge metal-oxide-semiconductor, 7, charging metal-oxide-semiconductor, 8, MCU.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment 1: a kind of lithium battery management system for electric car; its circuit theory connection layout as depicted in figs. 1 and 2; management system one end 2 is connected with battery pack 1; the other end of management system is connected with load 3; management system comprises first class of protection circuit 4 and safe secondary protection circuit 5; first class of protection circuit connects electric discharge metal-oxide-semiconductor 6 and charging metal-oxide-semiconductor 7 simultaneously, and electric discharge metal-oxide-semiconductor and charging metal-oxide-semiconductor are connected on the two ends of battery pack and load.Safe secondary protection circuit comprises MCU8, N-MOS pipe Q1, NPN triode Q2, controllable silicon, MCU controls the one end exporting I/O port contact resistance R1, the other end of resistance R1 is connected with the grid of N-MOS pipe Q1, the source class ground connection of N-MOS pipe Q1, the drain electrode of N-MOS pipe Q1 is connected with one end of resistance R2, the base stage of the other end connecting triode Q2 of resistance R2, the collector electrode of triode Q2 with for driving the voltage VCC of controlled silicon conducting to be connected, voltage VCC is also connected with one end of resistance R3, the other end of resistance R3 is connected with the base stage of triode Q2, resistance R4 and diode D1 is also connected with between the emitter of triode Q2 and SCR control end, the emitter of triode Q2 is connected with one end of resistance R4, the other end of resistance R4 is connected with the anode of diode D1, the negative electrode of diode D1 is connected with SCR control end.Between the source electrode of N-MOS pipe and drain electrode, also reversal connection in parallel has diode.
N-MOS pipe adopts 2N7002, and triode adopts 2N3906, and controllable silicon adopts TYN640, MCU to adopt PIC series to wait single-chip microcomputer, and the specification of described fuse can select rakish fuse according to the demand of actual current.The first class of protection over-charge protective magnitude of voltage of lithium battery management system is set up as 4.2V, and Cross prevention magnitude of voltage sets up 2.8V, and the over-charge protective magnitude of voltage of second class protection is set up as 4.4V, and Cross prevention magnitude of voltage sets up 2.4V; When single lithium battery voltage is higher than one-level overcharged voltage or lower than one-level overdischarge pressure, management system then can charge closing metal-oxide-semiconductor or electric discharge metal-oxide-semiconductor, to stop charge or discharge, and protection lithium battery group; When lithium battery group monomer voltage has higher than secondary over-charge protective or presses lower than secondary overdischarge, then MCU thinks that first class of protection lost efficacy, and start second class protection, MCU exports high level.Described N-MOS pipe Q1 and the object combinationally used of triode Q2 meet low-voltage to control high voltage.After MCU exports high level, voltage is by the grid of resistance R1 to N-MOS pipe Q1, and N-MOS pipe Q1 will conducting, and then the base stage of triode Q2 is because of the dividing potential drop of resistance R2 and resistance R3, the collector electrode of triode Q2 and the base stage of triode Q2 will form bias voltage, make triode Q2 conducting.After triode Q2 conducting, voltage VCC voltage can pass through silicon controlled control end, makes controlled silicon conducting; After controlled silicon conducting, battery pack will pass through controllable silicon, fuse forms broken circuit, and because short circuit current is excessive, fuse can fuse instantaneously, and when after blown fuse, controllable silicon, owing to not having loop (maintenance) electric current, will be closed.By with upper type, make the blown fuse of lithium battery group and load circuit, when first class of protection lost efficacy, battery pack also can quit work, and ensured safety.
Claims (6)
1. a lithium battery management system for electric car; management system one end is connected with battery pack; the other end of management system is connected with load; it is characterized in that; management system comprises first class of protection circuit and safe secondary protection circuit, and first class of protection circuit connects electric discharge metal-oxide-semiconductor and charging metal-oxide-semiconductor simultaneously, and electric discharge metal-oxide-semiconductor and charging metal-oxide-semiconductor are connected on the two ends of battery pack and load; safe secondary protection circuit is connected with fuse, and fuse is connected with electric discharge metal-oxide-semiconductor and the metal-oxide-semiconductor that charges.
2. a kind of lithium battery management system for electric car according to claim 1, it is characterized in that, described safe secondary protection circuit comprises MCU, N-MOS pipe Q1, NPN triode Q2, controllable silicon, MCU controls the one end exporting I/O port contact resistance R1, the other end of resistance R1 is connected with the grid of N-MOS pipe Q1, the source class ground connection of N-MOS pipe Q1, the drain electrode of N-MOS pipe Q1 is connected with one end of resistance R2, the base stage of the other end connecting triode Q2 of resistance R2, the collector electrode of triode Q2 with for driving the voltage VCC of controlled silicon conducting to be connected, voltage VCC is also connected with one end of resistance R3, the other end of resistance R3 is connected with the base stage of triode Q2, the emitter of triode Q2 is connected with silicon controlled control end, silicon controlled anode is connected with the positive pole of battery pack, silicon controlled negative electrode is connected with one end of fuse and the negative pole of load.
3. a kind of lithium battery management system for electric car according to claim 2, it is characterized in that, resistance R4 and diode D1 is also connected with between the emitter of described triode Q2 and SCR control end, the emitter of triode Q2 is connected with one end of resistance R4, the other end of resistance R4 is connected with the anode of diode D1, and the negative electrode of diode D1 is connected with SCR control end.
4. a kind of lithium battery management system for electric car according to claim 2, is characterized in that, between the source electrode of described N-MOS pipe and drain electrode, also reversal connection in parallel has diode.
5. a kind of lithium battery management system for electric car according to claim 2, is characterized in that, described controllable silicon relay substitutes.
6. an electric motor car, is characterized in that, comprises the lithium battery management system for electric car of claim 1 to 5 described in any one.
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| CN201410644040.XA CN104466917A (en) | 2014-11-14 | 2014-11-14 | Electric vehicle lithium battery management system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342611A (en) * | 2017-07-19 | 2017-11-10 | 北京军秀咨询有限公司 | A kind of lithium battery group vehicle-mounted charge control method |
| CN108448681A (en) * | 2018-04-10 | 2018-08-24 | 广东力科新能源有限公司 | A kind of online method for detecting of the charger of battery management system |
| CN109687558A (en) * | 2019-02-23 | 2019-04-26 | 深圳市超能威电子有限公司 | The control system and method for multi-series lithium battery group shielding failure |
| CN109725558A (en) * | 2018-09-26 | 2019-05-07 | 山东精工电子科技有限公司 | A kind of anti-battery management system and control method of casting anchor for logistics sorting vehicle |
| CN113949126A (en) * | 2021-10-14 | 2022-01-18 | 东莞新能安科技有限公司 | Charging protection circuit, battery management system, battery pack and circuit control method |
| CN117879559A (en) * | 2023-12-21 | 2024-04-12 | 宁波兴为汽车电子有限公司 | Secondary protection device and protection method for MOS high-side output failure |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342611A (en) * | 2017-07-19 | 2017-11-10 | 北京军秀咨询有限公司 | A kind of lithium battery group vehicle-mounted charge control method |
| CN108448681A (en) * | 2018-04-10 | 2018-08-24 | 广东力科新能源有限公司 | A kind of online method for detecting of the charger of battery management system |
| CN108448681B (en) * | 2018-04-10 | 2021-09-07 | 广东力科新能源有限公司 | Charger online detection method of battery management system |
| CN109725558A (en) * | 2018-09-26 | 2019-05-07 | 山东精工电子科技有限公司 | A kind of anti-battery management system and control method of casting anchor for logistics sorting vehicle |
| CN109687558A (en) * | 2019-02-23 | 2019-04-26 | 深圳市超能威电子有限公司 | The control system and method for multi-series lithium battery group shielding failure |
| CN113949126A (en) * | 2021-10-14 | 2022-01-18 | 东莞新能安科技有限公司 | Charging protection circuit, battery management system, battery pack and circuit control method |
| CN117879559A (en) * | 2023-12-21 | 2024-04-12 | 宁波兴为汽车电子有限公司 | Secondary protection device and protection method for MOS high-side output failure |
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