CN103786583A - Battery management system (BMS) controlling high voltage output according to collision signals - Google Patents
Battery management system (BMS) controlling high voltage output according to collision signals Download PDFInfo
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- CN103786583A CN103786583A CN201310288147.0A CN201310288147A CN103786583A CN 103786583 A CN103786583 A CN 103786583A CN 201310288147 A CN201310288147 A CN 201310288147A CN 103786583 A CN103786583 A CN 103786583A
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Abstract
The invention discloses a battery management system (BMS) controlling high voltage output according to collision signals. The system monitors safe airbag output signal periods in real time through a main control unit; if the safe airbag output signal periods are in a set value range, an output unit operates normally, and a power battery pack outputs normally; if the safe airbag output signal periods are smaller than 10 times of the set value, a vehicle is determined to be collided, safe airbags start, and the battery management system cuts off main positive and negative contactors of a power battery pack output unit, high voltage output of the power battery pack, an inner contactor inside the power battery pack and the connections in series of inner batteries. When an electric vehicle is collided, the battery management system cuts off high voltage output of the power battery pack and inner connections, and safety of the electric vehicle is improved; compared with the prior art, additional hardware facilities are almost omitted, cost is low, and operating reliability is high.
Description
Technical field
The present invention relates to electric vehicle engineering field.
Background technology
The power battery management system overwhelming majority of the electronlmobil that moved does not in the market have auto against signal testing function, in the time that automobile bumps, power battery management system is to carry out perception to vehicle collision fault in time, this may cause vehicle electric leakage on fire, or the charged passengers inside the car of causing of car body get an electric shock and cause further injury, thereby strengthen the danger of people on vehicle.The patent No. is that 201220492764.3 Chinese invention patent discloses a kind of new forms of energy manned vehicle high pressure collision safety system, comprise entire car controller, electric machine controller, battery manager and direct current transducer, by high-speed CAN bus and battery management, it is connected with electric machine controller described entire car controller, on electric machine controller, be in series with electrokinetic cell, between electric machine controller and electrokinetic cell, be parallel with direct current transducer and electric capacity, on described battery manager, be in series with main contactor and negative pole contactless switch, main contactor is connected with the inertia switch on vehicle, inertia switch is connected with external power supply and entire car controller.In this invention, carry out impact detection by entire car controller, while bumping, directly disconnect main contactor by inertia switch, the disconnection of electrokinetic cell while having guaranteed to bump, has improved the reliability that system high pressure directly disconnects.But in this invention, need additionally to increase multiple hardware circuits, the loaded down with trivial details fault rate that increases work of circuit, and cost is higher.
Summary of the invention
The present invention is directed to above-mentioned problems of the prior art, propose a kind of battery management system according to collision alarm control High voltage output, the safety precaution to high-voltage battery system while bumping for realizing electronlmobil.
The technical scheme that the present invention takes is: a kind of battery management system according to collision alarm control High voltage output, the battery voltage signal detecting unit, the output unit that comprise main control unit and be connected with main control unit, described output unit comprise be connected on respectively on the positive and negative bus out of power battery pack always just, total negative contactless switch; Described main control unit is also connected with safety air bag signal output part, in order to real-time monitoring safety air bag output signal.
Specifically the cycle of safety air bag output signal is detected, detection judgment mode is as follows: described main control unit carries out periodicity to safety air bag output signal and detects, as the safety air bag output signal cycle in range of set value time, judge that automobile does not bump, output unit work, power battery pack is normally exported; While being less than ten times of following scopes of setting value as the safety air bag output signal cycle, judge that automobile bumps, safety air bag starts, battery management system control disconnect power battery pack output unit always just, total negative contactless switch, disconnect the High voltage output of power battery pack.
Preferably, judge when automobile bumps, also comprise the inside contactless switch that disconnects power battery pack, cut off the step being connected in series between inner cell.
Preferably, described battery management system is ignored first semiperiodic signal detecting.
Compared with prior art, the present invention has following significant beneficial effect: (1) the present invention is after electronlmobil is bumping, battery management system (BMS) can cut off battery pack High voltage output, avoid because battery pack high potential causes the injury of secondary electricity, the safety that has improved electronlmobil to driver and crew; (2) after electronlmobil bumps, because BMS cuts off the cell of battery pack internal series-connection, reduce the possibility of automobile generation burning and battery short circuit, reduce car owner's property damage.
The present invention needs to increase extra hardware facility hardly in addition, and simple, cost is low, and functional reliability is high.
The specific embodiment
In order to allow those skilled in the art understand better technical scheme of the present invention, below in conjunction with embodiment, the present invention is further elaborated.
Battery management system BMS of the present invention, by the square-wave signal of real-time detection safe automobile air bag output, i.e. collision alarm, controls battery pack output and inner connection, realizes safety precaution.
Battery voltage signal detecting unit, output unit that described battery management system comprises main control unit and is connected with main control unit, described output unit comprise be connected on respectively on the positive and negative bus out of power battery pack always just, total negative contactless switch.The control flow of the safety precaution of described battery management system is as follows:
When automobile starting, BMS just starts to detect, and for the accuracy detecting, first semiperiodic signal detecting is invalid, first signal for example detecting is low level signal, while so extremely changing high level signal into this low level, BMS just thinks that it is useful signal, starts timing, back up this high level signal simultaneously, the accuracy of assurance system judgement, in the time that this high signal becomes low level till, record this high level signal time length △ T high=t1; In the time that BMS detects that signal becomes low level, BMS restarts timing, backs up this low level signal simultaneously, while becoming high level to this low signal till, record low level signal time length △ T low=t2.In order to judge in time generation and the safety of vehicle trouble, main control unit is periodically to detect to collision alarm, and cycle detection time is generally tens to hundreds of millisecond.
In the time that automobile does not bump, safety air bag is not activated: t=△ T1+ △ T2, generally between 150-250ms, be normal condition according to various different automobile types t, and this cycle can change according to signal generator.
After automobile bumps, safety air bag starts: t=△ T1+ △ T2, generally between 15-25ms, all represent that according to various different automobile types t safety air bag starts, and same, this cycle also can change according to signal generator.
The cycle of the square-wave signal that battery management system BMS exports according to safe automobile air bag changes, be that normal condition changed and compares with the cycle of error state, in the time that the cycle, variation differed more than 10 times, judge this collision happens accident, there is serious safety failure, now BMS disconnect immediately power battery pack always just, total negative contactless switch, disconnect all High voltage outputs of power battery pack, disconnect the inside contactless switch of battery pack, cut off being connected in series of internal cell, reduce the builtin voltage of battery pack, to avoid vehicle occurring after traffic accident because battery high potential causes the injury of secondary electricity.In the cycle of safety air bag output square-wave signal changes lower than 10 times time, BMS normally works, and allows high pressure normally to export.
It should be noted that; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (3)
1. the battery management system according to collision alarm control High voltage output, the battery voltage signal detecting unit, the output unit that comprise main control unit and be connected with main control unit, described output unit comprise be connected on respectively on the positive and negative bus out of power battery pack always just, total negative contactless switch; It is characterized in that: described main control unit is also connected with safety air bag signal output part, in order to real-time monitoring safety air bag output signal;
Described main control unit carries out periodicity to safety air bag output signal and detects, and in range of set value time, judges that automobile does not bump as the safety air bag output signal cycle, output unit work, and power battery pack is normally exported; While being less than ten times of following scopes of setting value as the safety air bag output signal cycle, judge that automobile bumps, safety air bag starts, battery management system control disconnect power battery pack output unit always just, total negative contactless switch, disconnect the High voltage output of power battery pack.
2. according to claim 1 according to the battery management system of collision alarm control High voltage output, it is characterized in that: judge when automobile bumps, also comprise the inside contactless switch that disconnects power battery pack, cut off the step being connected in series between inner cell.
3. according to claim 1 according to the battery management system of collision alarm control High voltage output, it is characterized in that: described battery management system is ignored first semiperiodic signal detecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310288147.0A CN103786583A (en) | 2013-07-10 | 2013-07-10 | Battery management system (BMS) controlling high voltage output according to collision signals |
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| CN201310288147.0A CN103786583A (en) | 2013-07-10 | 2013-07-10 | Battery management system (BMS) controlling high voltage output according to collision signals |
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| CN103786583A true CN103786583A (en) | 2014-05-14 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104477034A (en) * | 2014-05-20 | 2015-04-01 | 吴光友 | Car outage device and car equipped with the same |
| CN105799518A (en) * | 2016-03-31 | 2016-07-27 | 北京长城华冠汽车科技股份有限公司 | Method and device for high voltage protection of electric automobile |
| CN106093786A (en) * | 2016-06-30 | 2016-11-09 | 上海汽车集团股份有限公司 | Electric automobile collision high pressure power-off validation test method |
| US10132868B2 (en) | 2016-12-20 | 2018-11-20 | Industrial Technology Research Institute | Battery management system and method thereof |
| CN111273099A (en) * | 2020-01-21 | 2020-06-12 | 华霆（合肥）动力技术有限公司 | BMS system test system |
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| CN102765363A (en) * | 2012-06-19 | 2012-11-07 | 常州瑞恩动力科技有限公司 | Automatic collision protector for novel energy automobile |
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| CN201800559U (en) * | 2010-09-12 | 2011-04-20 | 锦州万得新能源汽车技术有限公司 | Electric vehicle power source safety protection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104477034A (en) * | 2014-05-20 | 2015-04-01 | 吴光友 | Car outage device and car equipped with the same |
| CN105799518A (en) * | 2016-03-31 | 2016-07-27 | 北京长城华冠汽车科技股份有限公司 | Method and device for high voltage protection of electric automobile |
| CN105799518B (en) * | 2016-03-31 | 2019-02-15 | 北京长城华冠汽车科技股份有限公司 | A kind of high voltage protective method and apparatus of electric car |
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| US10132868B2 (en) | 2016-12-20 | 2018-11-20 | Industrial Technology Research Institute | Battery management system and method thereof |
| CN111273099A (en) * | 2020-01-21 | 2020-06-12 | 华霆（合肥）动力技术有限公司 | BMS system test system |
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Application publication date: 20140514 |