CN104852358A - High-voltage battery over-voltage and under-voltage protection system and automobile provided with same - Google Patents
High-voltage battery over-voltage and under-voltage protection system and automobile provided with same Download PDFInfo
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- CN104852358A CN104852358A CN201410414700.5A CN201410414700A CN104852358A CN 104852358 A CN104852358 A CN 104852358A CN 201410414700 A CN201410414700 A CN 201410414700A CN 104852358 A CN104852358 A CN 104852358A
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Abstract
The invention discloses a high-voltage battery over-voltage and under-voltage protection system and an automobile provided with the same. The high-voltage battery over-voltage and under-voltage protection system comprises a hardware protection system and a software protection system. The hardware protection system and the software protection system detect the over-voltage and under-voltage condition of a high-voltage battery independently of each other, and based on detection results, the hardware protection system and the software protection system control the on-off state of a high-voltage main circuit independently of each other. Through a hardware and software combination manner, high-voltage battery over-voltage and under-voltage protection system realizes the purpose that a high-voltage contactor is switched off under the over-voltage and under-voltage condition, the problem in that prior art that a battery is seriously over charged or over discharged because of a protection failure caused by a software failure is solved, the work reliability of the battery protection system is improved, and the normal service lifetime of a battery is prolonged.
Description
Technical field
The present invention relates to automobile technical field, particularly relate to and a kind ofly the system of overvoltage/undervoltage protection is carried out to high-tension battery and there is its automobile.
Background technology
Electric automobile and hybrid electric vehicle have pollution-free, oligosaprobic advantage, become the Main way of contemporary automotive development, to develop and research has very important significance to electric automobile key technology.
Battery is originated as the major impetus of electric automobile; carry out real-time monitoring to cell voltage to be very important; and the power brick that high pressure, multiple battery cell are composed in series is mainly used in electric automobile, hybrid electric vehicle etc.; due to their high-energy-density; put will cause permanent infringement to battery itself once overcharge or cross; therefore in order to ensure that high-tension battery can normally work, overvoltage is carried out to battery itself and under-voltage protection is very important.
In the prior art, battery management system is monitored high-tension battery and is all carried out break-make by software control high voltage connector.In extreme circumstances, if there is battery overvoltage or under-voltage fault, simultaneously during battery management system software failure, just very possible generation can not disconnect the situation of high voltage connector in time, cannot avoid causing further injury to battery.The Chinese patent that the patent No. is 201220238770.6, publication date is on January 23rd, 2013, patent name is " a kind of high-voltage protective system of electric automobile ", proposes a kind of battery overvoltage and under-voltage protection scheme.But because it just adopts software-controlled manner merely, make to disconnect high voltage connector in time in extreme circumstances.
Therefore wish that a kind of high-tension battery overvoltage/undervoltage protection system overcomes or at least to alleviate in the above-mentioned defect of prior art one or more.
Summary of the invention
The object of the present invention is to provide a kind of high-tension battery overvoltage/undervoltage protection system, to overcome or at least to alleviate in the above-mentioned defect of prior art one or more.
For achieving the above object, the invention provides a kind of high-tension battery overvoltage/undervoltage protection system.Described high-tension battery overvoltage/undervoltage protection system comprises hardware protection system and security system for software two parts; hardware protection system and security system for software detect high-tension battery overvoltage/undervoltage situation independently of each other, and control the break-make of high pressure main circuit independently of each other based on testing result.
Preferably, by its inner hardware circuit arranged, hardware protection system judges that whether high-tension battery voltage status is normal, and when high-tension battery voltage status is abnormal, cutoff high main circuit; By CPU, security system for software judges that whether high-tension battery voltage status is normal, and when high-tension battery voltage status is abnormal, cutoff high main circuit.
Preferably, the break-make in the mains side loop of the contactor coil of described hardware protection Systematical control high pressure main circuit mesohigh contactor; Described security system for software controls the break-make in the ground side loop of the contactor coil of high pressure main circuit mesohigh contactor.
Preferably, described hardware protection system comprises voltage-reference, voltage comparator circuit and hardware driving circuit, voltage-reference is used for output reference voltage, as a road input of voltage comparator circuit, another input interface of voltage comparator circuit is connected with the output of HIGH PRESSURE TREATMENT circuit, voltage comparator circuit compares the output voltage of HIGH PRESSURE TREATMENT circuit and the reference voltage of high voltage reference source output, and result outputs control signals to hardware driving circuit based on the comparison, hardware driving circuit is the drive circuit of high voltage connector, the break-make of high voltage connector is controlled according to the control signal of voltage comparator circuit, wherein, described HIGH PRESSURE TREATMENT circuit exports voltage comparator circuit to after changing high-tension battery voltage.
Preferably, voltage comparator circuit is time delay comparison circuit, time delay comparison circuit comprises comparator and delay circuit, the output of voltage-reference and HIGH PRESSURE TREATMENT circuit is as the input of comparator, by comparing the output voltage of HIGH PRESSURE TREATMENT circuit and the output voltage of voltage-reference, comparator judges whether high-tension battery is in overvoltage and under-voltage; If be in overvoltage or under-voltage, and exceed the time that delay circuit arranges, namely the output level of comparator reverses, cutoff high contactor.
Preferably, hardware driving circuit is photoelectric coupled circuit or MOSFET circuit, and the output of voltage comparator circuit is connected with the input control end of hardware driving circuit, and described hardware driving circuit is as the drive circuit of the contactor coil in high voltage connector.
Preferably, HIGH PRESSURE TREATMENT circuit is decompression converting circuit, and described HIGH PRESSURE TREATMENT circuit carries out step-down process by electric resistance partial pressure or voltage isolation to high-tension battery voltage.
Preferably; described security system for software comprises CPU and CPU drive circuit; CPU gathers high-tension battery voltage and also it and reference voltage is compared, and result outputs control signals to CPU drive circuit based on the comparison, CPU drive circuit control high voltage connector break-make.
Preferably, CPU gathers high-tension battery voltage by described HIGH PRESSURE TREATMENT circuit.
The present invention also provides a kind of automobile, and described automobile comprises above-mentioned high-tension battery overvoltage/undervoltage protection system, and wherein, described automobile is electric motor car or hybrid electric vehicle.Be understandable that, hybrid electric vehicle herein refers to have at least a kind of main driving power to be the hybrid electric vehicle of electric power.
The object of high voltage connector is disconnected under high-tension battery overvoltage/undervoltage protection system of the present invention reaches overvoltage/undervoltage situation by the mode that hardware and software combines; solve in prior art because software failure causes shielding failure to cause battery seriously to overcharge or cross the problem of putting; improve the functional reliability of battery protection system, extend the normal service life of battery.
Accompanying drawing explanation
Fig. 1 is the schematic block diagram of high-tension battery overvoltage/undervoltage protection system according to an embodiment of the invention.
Reference numeral:
| 1 | Voltage-reference | 4 | Hardware driving circuit |
| 2 | HIGH PRESSURE TREATMENT circuit | 5 | Security system for software |
| 3 | Time delay comparison circuit | 6 | Contactor coil |
Embodiment
For making object of the invention process, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Described embodiment is the present invention's part embodiment, instead of whole embodiments.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
Described high-tension battery overvoltage/undervoltage protection system comprises hardware protection system and security system for software; hardware protection system and security system for software detect high-tension battery overvoltage/undervoltage situation independently of each other, and control the break-make of high pressure main circuit independently of each other based on testing result.
The object of high voltage connector is disconnected under high-tension battery overvoltage/undervoltage protection system of the present invention reaches overvoltage/undervoltage situation by the mode that hardware and software combines; solve in prior art because software failure causes shielding failure to cause battery seriously to overcharge or cross the problem of putting; improve the functional reliability of battery protection system, extend the normal service life of battery.
Be understandable that, namely hardware protection system compares the high-tension battery voltage in electric motor car or hybrid electric vehicle and reference voltage by building hardware circuit, and on the basis of the results of the comparison, is controlled adjustment to the work of battery.That is hardware protection system judges high-tension battery voltage status (whether overvoltage or under-voltage) by its inner hardware circuit arranged and controls the break-make of the device for switching in high pressure main circuit, thus is reached through the protection of hardware implementing battery overvoltage/undervoltage.Security system for software is then that the monitoring facilities by editting compares the value of high-tension battery voltage and threshold value; according to comparative result; processor sends control command; thus control the work of high voltage connector; that is security system for software judges high-tension battery voltage status by CPU and controls the break-make of the device for switching in high pressure main circuit, realizes the object being protected battery by software systems.
Should be noted also that the present invention program is not only applicable to high-tension battery, even if for common batteries, also protect by high-tension battery overvoltage/undervoltage protection system of the present invention, thus improve job security and the reliability of battery system.If technical scheme of the present invention is used for high-tension battery, collection be the output voltage of HIGH PRESSURE TREATMENT circuit for the real-time voltage compared.Advantageously; this HIGH PRESSURE TREATMENT circuit is decompression converting circuit; this HIGH PRESSURE TREATMENT circuit carries out step-down process by electric resistance partial pressure or voltage isolation to the output high pressure of high-tension battery, thus the safety monitoring under realizing low pressure condition, improve the job security of whole protection system.
High-tension battery overvoltage/undervoltage protection system described by above-described embodiment is on the basis of traditional software protection system; combine hardware protection and software protection; economic benefits and social benefits are protected; thus improve the functional reliability of whole protection system, prevent protection system to lose efficacy and bring darker infringement to battery system itself.
Fig. 1 is the schematic block diagram of high-tension battery overvoltage/undervoltage protection system according to an embodiment of the invention.
Contactor coil 6, CPU and the CPU drive circuit 5 of voltage-reference 1, HIGH PRESSURE TREATMENT circuit 2, time delay comparison circuit 3 (voltage comparator circuit), hardware driving circuit 4 and high voltage connector have been shown in Fig. 1.Described hardware protection system comprises voltage-reference 1, time delay comparison circuit 3 and hardware driving circuit 4.Voltage-reference 1, with storage battery power supply, exports one or more reference voltage, as the benchmark compared.The output access voltage comparator circuit of voltage-reference 1, another input interface of voltage comparator circuit is connected with the output of HIGH PRESSURE TREATMENT circuit 2.Voltage comparator circuit compares the output voltage of HIGH PRESSURE TREATMENT circuit 2 and the reference voltage of high voltage reference source output, and result outputs control signals to hardware driving circuit 4 based on the comparison.Hardware driving circuit 4 is the drive circuit of high voltage connector, and hardware driving circuit 4 changes according to the Output rusults of voltage comparator circuit and drives working method: contactor coil 6 is switched on power positive pole, or disconnects from positive source.More specifically, the disconnection in mains side (side of the positive electrode) loop of control contactor coil 6 or connection.Occur high-tension battery overcharge or charge less time, cut off the mains side loop of contactor coil 6, disconnect high voltage connector, and then the whole loop of cutoff high system.
Security system for software comprises CPU and CPU drive circuit 5.CPU gathers the voltage of high-tension battery or high-pressure system, just by it and the threshold value preset or scope (i.e. reference voltage, be actually reference voltage level) compare, and result judges voltage condition (such as high-tension battery overcharges or charge less) based on the comparison.The described threshold value that presets or scope can be stored in advance in CPU or in memory, and also can gather before comparing, the value such as gathering described reference voltage is worth as the reference voltage.CPU outputs control signals to based on judged result the work that CPU drive circuit 6, CPU drive circuit 6 controls high voltage connector.More specifically, the disconnection in the ground side loop of control contactor coil 6 or connection.Occur high-tension battery overcharge or charge less time, cut off the ground side loop of contactor coil 6, disconnect high voltage connector, and then the whole loop of cutoff high system.
Voltage comparator circuit in embodiment illustrated in fig. 1 is time delay comparison circuit 3, and this time delay comparison circuit 3 comprises comparator, delay circuit.Voltage-reference 1 and HIGH PRESSURE TREATMENT circuit 2 are as the input of comparator.Voltage-reference 1 exports one or more reference voltage, the input of the output voltage access comparator of HIGH PRESSURE TREATMENT circuit 2.Comparator in voltage comparator circuit is by determining whether to there occurs overvoltage and under-voltage to the output voltage of HIGH PRESSURE TREATMENT circuit 2 and the voltage compare of voltage-reference 1; If there occurs overvoltage or under-voltage, and by the work of delay circuit, compare detection after a certain time and still there is overvoltage or undervoltage condition, namely there is overvoltage or under-voltage situation and exceeded the time that delay circuit arranges, namely the output level of comparator reverses.
It is worth mentioning that, the reference voltage that reference voltage source exports both was built by hardware circuit, and also realize by the existing reference voltage source chip in market, the two is all within protection scope of the present invention.
It is pointed out that comparison circuit 3 can be arranged only an input voltage and a reference voltage to be compared, and Output rusults; Also an input voltage and multiple reference voltage can be compared and Output rusults; Even multiple input voltage and multiple reference voltage can be compared (such as, arranging multiple comparator device).
The output of the comparator of time delay comparison circuit 3 is connected with the input control end of hardware driving circuit 4, the drive circuit of described hardware driving circuit 4 as the contactor coil 6 in high voltage connector, the power supply of control contactor coil 6.In the present invention; hardware driving circuit 4 is photoelectric coupled circuit or MOSFET circuit; after upset occurs the output level of comparator, the operating state of optocoupler or MOSFET also can change thereupon, quit work; also just stopped the power supply to contactor coil 6; be disconnected the work of high voltage connector, thus reach the object of high-tension battery overvoltage/undervoltage situation being carried out to hardware protection.
Security system for software in illustrated embodiment comprises CPU and CPU drive circuit 5.CPU gathers high-voltage system voltage and it is compared with reference voltage, and result judges voltage condition based on the comparison, outputs control signals to CPU drive circuit 5.The CPU drive circuit 5 be connected with high voltage connector controls the work of high voltage connector.
The input of CPU is the output of HIGH PRESSURE TREATMENT circuit 2.HIGH PRESSURE TREATMENT circuit 2 be used for gather high-pressure system (voltage of such as battery pack) voltage.In the illustrated embodiment in which, the output of HIGH PRESSURE TREATMENT circuit 2 is due to the direct input as time delay comparison circuit simultaneously, and therefore, the output of HIGH PRESSURE TREATMENT circuit 2 is virtual voltages.In the case, the interface for being connected with HIGH PRESSURE TREATMENT circuit 2 of CPU, with analog to digital conversion circuit, the photovoltaic conversion for being collected by HIGH PRESSURE TREATMENT circuit 2 becomes digital signal (magnitude of voltage of high-pressure system), to compare within CPU.The CPU drive circuit 5 of security system for software is connected with the other end of the contactor coil 6 in high voltage connector.In FIG, the CPU drive circuit 5 controlled by CPU is for the ground of control contactor coil 6.Be understandable that, the present invention is not limited thereto.Such as, CPU drive circuit 5 can be set to the mains side (side of the positive electrode) for control contactor coil 6 equally.
The specific works flow process of high-tension battery overvoltage/undervoltage protection system described in the invention is as follows:
When there is not overvoltage or under-voltage situation in battery management high-pressure system, the mains side A of hardware driving circuit 4 control contactor coil 6, the ground side B of CPU drive circuit control contactor coil 6, contactor coil 6 is powered normally, contacts of contactor closes, and realizes the power supply to high tension loop.When overvoltage or under-voltage situation appear in battery management high-pressure system, need to disconnect contactor in time, disconnecting contactor can be realized by two paths; The first is greater than or less than default voltage-reference 1 voltage when HIGH PRESSURE TREATMENT circuit 2 exports, and when exceeding the time of time delay comparison circuit 3 setting, comparator output level reverses, thus hardware driving circuit 4 is quit work, cut off the power supply of contactor coil 6, achieve the disconnection of high voltage connector; Its two be when security system for software collect HIGH PRESSURE TREATMENT circuit 2 output voltage overvoltage or under-voltage time; if CPU is through judging it is that overvoltage or under-voltage occurs really; CPU drive circuit, by the cut-out of software simulating to contactor coil 6 ground side loop, also achieves the disconnection of high voltage connector.
It is pointed out that the mains side circuit that also security system for software can be set to control contactor coil 6, and be the ground side circuit of control contactor coil 6 by hardware protection Operation system setting.Also it is pointed out that the mains side circuit of control contactor coil 6 and the concrete mode of ground side circuit have multiple way of realization in the prior art.Such as, the output of hardware driving circuit or CPU drive circuit is directly connected with the mains side of contactor coil or ground side, under proper condition, the output of hardware driving circuit or CPU drive circuit is directly switch into and is connected with positive source or ground, the working method of control contactor coil thus.Again such as, further relay is set and comes the mains side circuit of control contactor coil 6 and the connecting and disconnecting of ground side circuit.
In addition, on the basis of above-mentioned high-tension battery overvoltage/undervoltage protection system, the present invention also provides a kind of automobile, and described automobile comprises high-tension battery overvoltage/undervoltage protection system as above, and wherein, described automobile is electric motor car or hybrid electric vehicle.
Advantage of the present invention be when battery management high-pressure system generation severe overvoltage or under-voltage time, even if software systems lost efficacy after, also can realize cutting off in time high tension loop, thus protect high-voltage battery system better.
Finally it is to be noted: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit.Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a high-tension battery overvoltage/undervoltage protection system; it is characterized in that; comprise hardware protection system and security system for software, hardware protection system and security system for software detect high-tension battery overvoltage/undervoltage situation independently of each other, and control the break-make of high pressure main circuit independently of each other based on testing result.
2. high-tension battery overvoltage/undervoltage protection system as claimed in claim 1, it is characterized in that, by its inner hardware circuit arranged, hardware protection system judges that whether high-tension battery voltage status is normal, and when high-tension battery voltage status is abnormal, cutoff high main circuit; By CPU, security system for software judges that whether high-tension battery voltage status is normal, and when high-tension battery voltage status is abnormal, cutoff high main circuit.
3. high-tension battery overvoltage/undervoltage protection system as claimed in claim 2, is characterized in that, the break-make in the mains side loop of the contactor coil of described hardware protection Systematical control high pressure main circuit mesohigh contactor; Described security system for software controls the break-make in the ground side loop of the contactor coil of high pressure main circuit mesohigh contactor.
4. the high-tension battery overvoltage/undervoltage protection system according to any one of claim 1-3, it is characterized in that, described hardware protection system comprises voltage-reference, voltage comparator circuit and hardware driving circuit, voltage-reference is used for output reference voltage, as a road input of voltage comparator circuit, another input interface of voltage comparator circuit is connected with the output of HIGH PRESSURE TREATMENT circuit, voltage comparator circuit compares the output voltage of HIGH PRESSURE TREATMENT circuit and the reference voltage of high voltage reference source output, and result outputs control signals to hardware driving circuit based on the comparison, hardware driving circuit is the drive circuit of high voltage connector, the break-make of high voltage connector is controlled according to the control signal of voltage comparator circuit, wherein, described HIGH PRESSURE TREATMENT circuit exports voltage comparator circuit to after changing high-tension battery voltage.
5. high-tension battery overvoltage/undervoltage protection system as claimed in claim 4, it is characterized in that, voltage comparator circuit is time delay comparison circuit, time delay comparison circuit comprises comparator and delay circuit, the output of voltage-reference and HIGH PRESSURE TREATMENT circuit is as the input of comparator, by comparing the output voltage of HIGH PRESSURE TREATMENT circuit and the output voltage of voltage-reference, comparator judges whether high-tension battery is in overvoltage and under-voltage; If be in overvoltage or under-voltage, and exceed the time that delay circuit arranges, namely the output level of comparator reverses, cutoff high contactor.
6. high-tension battery overvoltage/undervoltage protection system as claimed in claim 4; it is characterized in that; hardware driving circuit is photoelectric coupled circuit or MOSFET circuit; the output of voltage comparator circuit is connected with the input control end of hardware driving circuit, and described hardware driving circuit is as the drive circuit of the contactor coil in high voltage connector.
7. high-tension battery overvoltage/undervoltage protection system as claimed in claim 4, it is characterized in that, HIGH PRESSURE TREATMENT circuit is decompression converting circuit, and described HIGH PRESSURE TREATMENT circuit carries out step-down process by electric resistance partial pressure or voltage isolation to high-tension battery voltage.
8. the high-tension battery overvoltage/undervoltage protection system according to any one of claim 1-3; it is characterized in that; described security system for software comprises CPU and CPU drive circuit; CPU gathers high-tension battery voltage and it and reference voltage is compared; and result outputs control signals to CPU drive circuit based on the comparison, CPU drive circuit control high voltage connector break-make.
9. high-tension battery overvoltage/undervoltage protection system as claimed in claim 8, is characterized in that, CPU gathers high-tension battery voltage by described HIGH PRESSURE TREATMENT circuit.
10. an automobile, is characterized in that, comprises high-tension battery overvoltage/undervoltage protection system as claimed in any one of claims 1-9 wherein, and wherein, described automobile is electric motor car or hybrid electric vehicle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410414700.5A CN104852358A (en) | 2014-08-21 | 2014-08-21 | High-voltage battery over-voltage and under-voltage protection system and automobile provided with same |
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| CN201410414700.5A CN104852358A (en) | 2014-08-21 | 2014-08-21 | High-voltage battery over-voltage and under-voltage protection system and automobile provided with same |
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| CN106655083A (en) * | 2016-09-19 | 2017-05-10 | 深圳市康凯斯信息技术有限公司 | Wide voltage power supply protection device and method for electric car vehicle equipment |
| CN107492245A (en) * | 2017-07-31 | 2017-12-19 | 浙江榆阳电子有限公司 | A kind of intelligence control system of electric heating quilt based on controlled in wireless, Electric heating mattress and electric heating blanket |
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| CN109617186A (en) * | 2018-12-31 | 2019-04-12 | 常州车之翼动力科技有限公司 | The anti-overcharge structure of BMU battery management system hardware |
| CN109980609A (en) * | 2019-03-29 | 2019-07-05 | 江苏原容新能源科技有限公司 | Battery under-voltage protection method and system based on BMS |
| CN112803574A (en) * | 2021-03-23 | 2021-05-14 | 中国人民解放军国防科技大学 | Multi-stage security protection method and system for small satellite power supply |
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| CN106443454A (en) * | 2016-07-07 | 2017-02-22 | 惠州市博惠大科技有限公司 | Real-time monitoring and recognition method and system of lifetime of automobile battery |
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| CN107492245A (en) * | 2017-07-31 | 2017-12-19 | 浙江榆阳电子有限公司 | A kind of intelligence control system of electric heating quilt based on controlled in wireless, Electric heating mattress and electric heating blanket |
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| CN109494838A (en) * | 2018-12-14 | 2019-03-19 | 常州格力博有限公司 | Charge output protection circuit and charging output protection method |
| CN109617186A (en) * | 2018-12-31 | 2019-04-12 | 常州车之翼动力科技有限公司 | The anti-overcharge structure of BMU battery management system hardware |
| CN109980609A (en) * | 2019-03-29 | 2019-07-05 | 江苏原容新能源科技有限公司 | Battery under-voltage protection method and system based on BMS |
| CN109980609B (en) * | 2019-03-29 | 2021-05-18 | 江苏赣锋动力科技有限公司 | Battery under-voltage protection method and system based on BMS |
| CN112803574A (en) * | 2021-03-23 | 2021-05-14 | 中国人民解放军国防科技大学 | Multi-stage security protection method and system for small satellite power supply |
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Application publication date: 20150819 |
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