CN203553295U - Novel safety management system for power battery pack of electric automobile - Google Patents
Novel safety management system for power battery pack of electric automobile Download PDFInfo
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- CN203553295U CN203553295U CN201320637081.7U CN201320637081U CN203553295U CN 203553295 U CN203553295 U CN 203553295U CN 201320637081 U CN201320637081 U CN 201320637081U CN 203553295 U CN203553295 U CN 203553295U
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Abstract
The utility model discloses a novel safety management system for a power battery pack of an electric automobile. The novel safety management system comprises the power battery pack, wherein the power battery pack comprises multiple power battery monomers, a charge/discharge current detection module is arranged on an output wire of the power battery pack, a gas pressure detection module, a temperature detection module and a voltage detection module are arranged on each power battery monomer, a data collection system is respectively connected with each gas pressure detection module, each temperature detection module, each voltage detection module and the charge/discharge current detection module, and a charge/discharge management system is connected with the data collection system. The novel safety management system disclosed by the utility model can sequentially detect four parameters, namely monomer gas pressure, monomer temperature, monomer voltage of the power battery pack, and charge/discharge capacity of the power battery pack, in the detection process, as long as one item achieves charge/discharge cut-off conditions, charge/discharge is stopped immediately, and if all the items are normal, the detection is performed continuously, so that overcharge or over-discharge of all the power battery monomers can be effectively prevented, the service life of the power battery pack is prolonged, and the safety of the power battery pack is improved.
Description
Technical field
The utility model belongs to electric automobile power battery administrative skill field, is specifically related to a kind of novel electric vehicle power battery pack safety management system.
Background technology
At present, electric vehicle engineering is ripe not enough, especially electrokinetic cell and administrative skill thereof are immature, electric automobile is because of over-charging of battery or cross and put the on fire and explosion phenomenon causing and happen occasionally, this not only brings severe challenge to the security of the lives and property, research and development to electric automobile simultaneously and apply and also bring serious negative effect.
It is upper that at present power battery of pure electric automobile group safety management is mainly reflected in charge/discharge management, according to the state-of-charge of power battery pack, battery cell the highest/minimum voltage and the highest/minimum temperature manage.There is following shortcoming in this power battery pack safety management mode:
First, due to battery pack state-of-charge estimated value, be subject to the Various Complex factor impacts such as battery charging and discharging multiplying power, battery temperature, the internal resistance of cell and self-discharge rate, accumulated error, estimated accuracy is not high, and state-of-charge estimated value is difficult to accurately reflect the actual state-of-charge of battery pack.In addition, due to the difference of the aspects such as battery material, technique and internal resistance, self-discharge rate, tend to cause battery cell to occur larger difference.Therefore, using power battery pack state-of-charge as safety management foundation, tend to cause the minimum battery cell of electric weight to cross to put and the highest battery cell of electric weight overcharges, thereby greatly affect battery life, when serious, can cause battery burning or blast.
Second, the battery cell of the safe charge/discharge of electrokinetic cell monomer is the highest/and minimum voltage and the highest/minimum temperature value be subject to the various factors such as charging and discharging currents, ambient temperature, the internal resistance of cell, is difficult to accurately to determine that the battery cell of the safe charge/discharge of battery cell is the highest/minimum voltage and the highest/minimum temperature.In addition, whether battery cell there will be danger to be mainly reflected in cell internal pressure and temperature, although some systems are monitored battery temperature, but current battery safety management system is not all monitored cell internal pressure, therefore to due to cell internal pressure raise cause battery leakage short circuit even the potential hazard of combustion explosion cannot monitor.
Utility model content
For overcoming the deficiency in above-mentioned technology, the purpose of this utility model is: a kind of novel electric vehicle power battery pack safety management system is provided, by the comprehensive analysis to parameters such as power battery pack medium power battery cell air pressure, monomer temperature, monomer voltage and power battery pack charge/discharge currents, the safe condition that accurately judges power battery pack, scientifically carries out power battery pack and discharges and recharges safety management.
The utility model for the technical scheme that its technical problem of solution adopts is:
Described novel electric vehicle power battery pack safety management system, comprise power battery pack, power battery pack consists of the electrokinetic cell monomer of multiple mutual series connection, power battery pack output line is provided with charge/discharge current detection module, on each electrokinetic cell monomer, be equipped with air pressure detection module, temperature detecting module and voltage detection module, data acquisition system is connected respectively with each air pressure detection module, temperature detecting module, voltage detection module and charge/discharge current detection module, and charge/discharge management system is connected with data acquisition system.
By air pressure detection module, temperature detecting module, voltage detection module and charge/discharge current detection module detect the monomer air pressure of power battery pack in real time, monomer temperature, these four parameters of monomer voltage and charge/discharge current, and the parameter detecting by data acquisition system Real-time Collection, then the transfer of data collecting is analyzed to charge/discharge management system, calculate, judge whether power battery pack is operated in safe condition, control the charge/discharge state of power battery pack, to prevent that overcharging from appearring in all electrokinetic cell monomers or excessively to put, contribute to improve the charging security of power battery pack and extend power battery pack cycle life.
Whether preferably, described air pressure detection module is connected with normally closed relay control end after mutually connecting, and normally closed relay output connects an alarm lamp, normal for the air pressure inside of real-time each electrokinetic cell monomer of monitoring.
Preferably, described air pressure detection module is normally closed baroswitch transducer, air pressure detection mode is: during the underfill of electrokinetic cell monomer, electrokinetic cell monomer internal gas pressure does not reach the air pressure that normally closed baroswitch transducer is disconnected, normally closed baroswitch transducer on each electrokinetic cell monomer is in conducting state, after series connection, give normally closed relay control end a voltage signal, normally closed relay is disconnected, thereby controlling alarm lamp extinguishes, when certain electrokinetic cell monomer occurs overcharging or excessively puts, its normally closed baroswitch transducer disconnects, thereby to the control signal of a disconnection of normally closed relay input, make normally closed relay meet turn-on condition, thereby output pressure switch alarm signal is to charge/discharge management system and alarm lamp.
Preferably, described temperature detecting module is temperature sensor, detects in real time the monomer temperature of each electrokinetic cell monomer, and the monomer temperature recording is transferred to data acquisition system.Temperature control mode is: the temperature information of the inner each point of power battery pack that the real-time collection of data acquisition system is detected by temperature sensor, pass to charge/discharge management system, charge/discharge management system will be transmitted the temperature information and the contrast of predefined safe temperature information that come, as long as wherein the temperature of some electrokinetic cell monomers is higher than predefined electrokinetic cell monomer safe working temperature, stop charge/discharge process, when the temperature of all temperature spots is during all lower than safety value, just allow to continue power battery pack to carry out charge/discharge, and when electrokinetic cell monomer temperature is too low, do not allow power battery pack to carry out charge/discharge with powerful electric current, can only be with the electric current charge/discharge of low range.
Preferably, described voltage detection module is voltage sensor, implements to measure the monomer voltage value of charge/discharge process medium power battery cell, and the monomer voltage recording is transferred to data acquisition system.Voltage control mode is: the each electrokinetic cell monomer in power battery pack is numbered in turn, take first electrokinetic cell monomer and second electrokinetic cell monomer as example, by voltage sensor, gather first electrokinetic cell monomer positive and negative electrode electromotive force, using first electrokinetic cell monomer negative electricity kinetic potential as voltage reference, both make the poor magnitude of voltage that obtains first electrokinetic cell monomer.Because first electrokinetic cell monomer positive terminal is connected with the negative terminal of second electrokinetic cell monomer, so the anodal electromotive force of first electrokinetic cell monomer can be used as the negative pole benchmark electromotive force of second electrokinetic cell monomer, then according to the numerical value of the anodal electromotive force of second electrokinetic cell monomer, deduct benchmark electromotive force and can obtain the magnitude of voltage of second electrokinetic cell monomer.The like just can obtain the monomer voltage of each electrokinetic cell monomer in power battery pack and the total voltage of power battery pack.Charge/discharge management system is by the monomer voltage information of each electrokinetic cell monomer and the contrast of predefined safe voltage information, as long as wherein the voltage of some electrokinetic cell monomers, higher than the trouble free service voltage of battery, stops charge/discharge process.The all magnitudes of voltage that gather when data acquisition system during all lower than predefined safe voltage value, just allow to continue power battery pack to carry out charge/discharge.
Preferably, described charge/discharge current detection module is Hall element, gathers power battery pack charge/discharge current information, and by these data information transfer to data acquisition system.Electric weight control mode is: by Hall element, gather the real-time charge/discharge current information of power battery pack, pass to charge/discharge management system, charge/discharge management system is according to charging current integration in time, calculate the real-time charge/discharge amount of power battery pack, when total charge/discharge amount equates with predefined electric weight, by charge/discharge management system, stopped the charge/discharge state of power battery pack.
Preferably, described data acquisition system is data acquisition unit, the charge/discharge current of monomer air pressure, monomer temperature, monomer voltage and the power battery pack of each electrokinetic cell monomer in can Real-time Collection power battery pack, and by these transfer of data to charge/discharge management system.
Preferably, described charge/discharge management system is single-chip microcomputer or PLC controller, can real-time analysis, calculate the real time information in the power battery pack charge/discharge process of being transmitted by data acquisition system, and according to the charging and discharging state of the output control power battery pack of data processing.
In above-mentioned air pressure, temperature, voltage and electric weight control mode, the detection of monomer air pressure is most important, is secondly monomer temperature, is then monomer voltage and charges and discharge electric weight, and therefore, the concrete control flow of charge/discharge management system is:
First detect the safety value whether each electrokinetic cell monomer air pressure inside has reached setting, as long as wherein there is an electrokinetic cell monomer to reach, stop charge/discharge process, if do not maintain original charge/discharge state, continue the next item down and detect.In the normal situation of air pressure, charge/discharge management system can continue to detect the temperature of each electrokinetic cell monomer, as long as wherein there is an electrokinetic cell monomer temperature to exceed safety value, stops charge/discharge process, if do not maintain original charge/discharge state, continue the next item down and detect.In normothermic situation, charge/discharge management system can detect the voltage of each electrokinetic cell monomer in power battery pack, as long as wherein there is the voltage of an electrokinetic cell monomer to exceed safety value, stop charge/discharge process, if do not maintain original charge/discharge state, continue the next item down and detect.In the normal situation of voltage, charge/discharge management system can be according to the charge/discharge amount of electric current and Time Calculation power battery pack, as long as reach the electric weight cut-off condition of the charge/discharge setting, stop charge/discharge process, if do not maintain original charge/discharge state.So according to the order of monomer air pressure, monomer temperature, monomer voltage, power battery pack charge/discharge amount, power battery pack is carried out to cycle detection, guarantee the safety of power battery pack charge/discharge process.
Compared with prior art, the utlity model has following beneficial effect:
Novel electric vehicle power battery pack safety management system described in the utility model can be successively according to monomer air pressure, monomer temperature, monomer voltage, the order of power battery pack charge/discharge amount detects the electrokinetic cell monomer in power battery pack, the any one that needs only any electrokinetic cell monomer in testing process reaches charge/discharge cut-off condition, stop immediately charge/discharge process, if all normally continue cycle detection, can effectively prevent the overdischarge of overcharging of all electrokinetic cell monomers, extended the useful life of power battery pack, improved the safety in utilization of power battery pack.
Accompanying drawing explanation
Fig. 1 is battery assembling of the present utility model and circuit connection diagram.
Fig. 2 is baroswitch sensor detection circuit figure of the present utility model.
Fig. 3 is cell safety state decision flow chart of the present utility model.
In figure: 1, alarm lamp 2, normally closed relay 3, normally closed baroswitch transducer 4, first electrokinetic cell monomer positive terminal 5, voltage sensor 6, second electrokinetic cell monomer negative terminal 7, Hall element 8, first electrokinetic cell monomer 9, second electrokinetic cell monomer 10, temperature sensor.
Embodiment
Below in conjunction with accompanying drawing, implementation process of the present utility model is described further:
As Fig. 1, shown in 2, novel electric vehicle power battery pack safety management system described in the present embodiment, comprise power battery pack, power battery pack consists of the electrokinetic cell monomer of multiple mutual series connection, it is characterized in that, power battery pack output line is provided with charge/discharge current detection module, on each electrokinetic cell monomer, be equipped with air pressure detection module, temperature detecting module and voltage detection module, data acquisition system and each air pressure detection module, temperature detecting module, voltage detection module is connected respectively with charge/discharge current detection module, charge/discharge management system is connected with data acquisition system.
By air pressure detection module, temperature detecting module, voltage detection module and charge/discharge current detection module detect the monomer air pressure of power battery pack in real time, monomer temperature, these four parameters of monomer voltage and charge/discharge current, and the parameter detecting by data acquisition system Real-time Collection, then the transfer of data collecting is analyzed to charge/discharge management system, calculate, judge whether power battery pack is operated in safe condition, control the charge/discharge state of power battery pack, to prevent that overcharging from appearring in all electrokinetic cell monomers or excessively to put, contribute to improve the charging security of power battery pack and extend power battery pack cycle life.
Wherein, described air pressure detection module is selected normally closed baroswitch transducer 3, normally closed baroswitch transducer 3 on each electrokinetic cell monomer is connected with normally closed relay 2 control ends after series connection mutually, whether normally closed relay 2 outputs connect an alarm lamp 1, normal for the air pressure inside of real-time each electrokinetic cell monomer of monitoring; Temperature detecting module is temperature sensor 10, detects in real time the monomer temperature of each electrokinetic cell monomer, and the monomer temperature recording is transferred to data acquisition system; Described voltage detection module is voltage sensor 5, implements to measure the monomer voltage of charge/discharge process medium power battery cell, and the monomer voltage recording is transferred to data acquisition system; Described charge/discharge current detection module is Hall element 7, gathers power battery pack charge/discharge current information, and by these data information transfer to data acquisition system; Described data acquisition system is data acquisition unit, the charge/discharge current of monomer air pressure, monomer temperature, monomer voltage and the power battery pack of each electrokinetic cell monomer in can Real-time Collection power battery pack, and by these transfer of data to charge/discharge management system; Described charge/discharge management system is single-chip microcomputer or PLC controller, can real-time analysis, calculate the real time information in the power battery pack charge/discharge process of being transmitted by data acquisition system, and according to the charging and discharging state of the output control power battery pack of data processing.
The present embodiment air pressure detection mode:
Each electrokinetic cell monomer is provided with air pressure valve, when electrokinetic cell monomer does not fill/is put into the state-of-charge of expection, electrokinetic cell monomer internal gas pressure does not reach the air pressure that air pressure valve disconnects, normally closed baroswitch transducer 3 on each electrokinetic cell monomer is in conducting state, after series connection, give normally closed relay 2 control end a voltage signal, normally closed relay 2 is disconnected, thereby controlling alarm lamp 1 extinguishes, when certain electrokinetic cell monomer fills/is put into after the state-of-charge of expection, its normally closed baroswitch transducer 3 disconnects, thereby input the control signal of a disconnection to normally closed relay 2, make normally closed relay 4 meet turn-on condition, thereby output pressure switch alarm signal is to alarm lamp 1.
The present embodiment temperature control mode:
The temperature information of the inner each point of power battery pack that the real-time collection of data acquisition system is detected by temperature sensing 10, pass to charge/discharge management system, charge/discharge management system will be transmitted the temperature information and the contrast of predefined safe temperature information that come, as long as wherein the temperature of some electrokinetic cell monomers is higher than the safe working temperature of predefined electrokinetic cell monomer, stop charge/discharge process, when the temperature of all temperature spots is during all lower than safety value, just allow to continue power battery pack to carry out charge/discharge, and when electrokinetic cell monomer temperature is too low, do not allow power battery pack to carry out charge/discharge with powerful electric current, can only be with the electric current charge/discharge of low range.
The present embodiment voltage control mode:
Each electrokinetic cell monomer in power battery pack is numbered in turn, take first electrokinetic cell monomer 8 and second electrokinetic cell monomer as example, by voltage sensor 5, gather first electrokinetic cell monomer, 8 positive and negative electrode electromotive force, using first electrokinetic cell monomer, 8 negative electricity kinetic potentials as voltage reference, both make the poor magnitude of voltage that obtains first electrokinetic cell monomer 8.Because first electrokinetic cell monomer positive terminal 4 is connected with the negative terminal 6 of second electrokinetic cell monomer, so first anodal electromotive force of electrokinetic cell monomer 8 can be used as the negative pole benchmark electromotive force of second electrokinetic cell monomer 9, then according to the numerical value of the anodal electromotive force of second electrokinetic cell monomer 9, deduct benchmark electromotive force and can obtain the magnitude of voltage of second electrokinetic cell monomer 9.The like just can obtain the monomer voltage of each electrokinetic cell monomer in power battery pack and the total voltage of power battery pack.Charge/discharge management system is by the monomer voltage information of each electrokinetic cell monomer and the contrast of predefined safe voltage information, as long as wherein the voltage of some electrokinetic cell monomers, higher than the trouble free service voltage of battery, stops charge/discharge process.The all magnitudes of voltage that gather when data acquisition system during all lower than predefined safe voltage value, just allow to continue power battery pack to carry out charge/discharge.
The present embodiment electric weight control mode:
By Hall element 7, gather the real-time charge/discharge current information of power battery pack, pass to charge/discharge management system, charge/discharge management system, according to charging current integration in time, calculates the real-time charge/discharge amount of power battery pack.When total charge/discharge amount equates with predefined electric weight, by charge/discharge management system, stopped the charge/discharge state of power battery pack.
In above-mentioned air pressure, temperature, voltage and electric weight control mode, the detection of monomer air pressure is most important, is secondly monomer temperature, then be monomer voltage and charge and discharge electric weight, therefore, as shown in Figure 3, in the present embodiment, the concrete control flow of charge/discharge management system is:
First detect the safety value whether each electrokinetic cell monomer air pressure inside has reached setting, as long as wherein there is an electrokinetic cell monomer to reach, stop charge/discharge process, if do not maintain original charge/discharge state, continue the next item down and detect.In the normal situation of air pressure, charge/discharge management system can continue to detect the temperature of each electrokinetic cell monomer, as long as wherein there is an electrokinetic cell monomer temperature to exceed safety value, stops charge/discharge process, if do not maintain original charge/discharge state, continue the next item down and detect.In normothermic situation, charge/discharge management system can detect the voltage of each electrokinetic cell monomer in power battery pack, as long as wherein there is the voltage of an electrokinetic cell monomer to exceed safety value, stop charge/discharge process, if do not maintain original charge/discharge state, continue the next item down and detect.In the normal situation of voltage, charge/discharge management system can be according to the charge/discharge amount of electric current and Time Calculation power battery pack, as long as reach the electric weight cut-off condition of the charge/discharge setting, stop charge/discharge process, if do not maintain original charge/discharge state.So according to the order of monomer air pressure, monomer temperature, monomer voltage, charge/discharge amount, power battery pack is carried out to cycle detection, guarantee the safety of power battery pack charge/discharge process.
The present embodiment can judge the cut-off state of power battery pack charge/discharge more accurately, effectively prevents that power battery pack from overcharging or excessively puts, and is conducive to extend the useful life of power power battery pack, improves fail safe.
Claims (8)
1. a novel electric vehicle power battery pack safety management system, comprise power battery pack, power battery pack consists of the electrokinetic cell monomer of multiple mutual series connection, it is characterized in that, power battery pack output line is provided with charge/discharge current detection module, on each electrokinetic cell monomer, be equipped with air pressure detection module, temperature detecting module and voltage detection module, data acquisition system is connected respectively with each air pressure detection module, temperature detecting module, voltage detection module and charge/discharge current detection module, and charge/discharge management system is connected with data acquisition system.
2. novel electric vehicle power battery pack safety management system according to claim 1, it is characterized in that, described air pressure detection module is connected with normally closed relay (2) control end after mutually connecting, and normally closed relay (2) output connects an alarm lamp (1).
3. novel electric vehicle power battery pack safety management system according to claim 1 and 2, is characterized in that, described air pressure detection module is normally closed baroswitch transducer (3).
4. novel electric vehicle power battery pack safety management system according to claim 1 and 2, is characterized in that, described temperature detecting module is temperature sensor (10).
5. novel electric vehicle power battery pack safety management system according to claim 1 and 2, is characterized in that, described voltage detection module is voltage sensor (5).
6. novel electric vehicle power battery pack safety management system according to claim 1 and 2, is characterized in that, described charge/discharge current detection module is Hall element (7).
7. novel electric vehicle power battery pack safety management system according to claim 1 and 2, is characterized in that, described data acquisition system is data acquisition unit.
8. novel electric vehicle power battery pack safety management system according to claim 1 and 2, is characterized in that, described charge/discharge management system is single-chip microcomputer or PLC controller.
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| CN201320637081.7U CN203553295U (en) | 2013-10-15 | 2013-10-15 | Novel safety management system for power battery pack of electric automobile |
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| CN201320637081.7U CN203553295U (en) | 2013-10-15 | 2013-10-15 | Novel safety management system for power battery pack of electric automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107946676A (en) * | 2017-12-14 | 2018-04-20 | 株洲广锐电气科技有限公司 | Battery management system and its management method based on safeguard protection |
| CN111091261A (en) * | 2019-10-14 | 2020-05-01 | 广东博力威科技股份有限公司 | Method for managing full life cycle of lithium battery |
-
2013
- 2013-10-15 CN CN201320637081.7U patent/CN203553295U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107946676A (en) * | 2017-12-14 | 2018-04-20 | 株洲广锐电气科技有限公司 | Battery management system and its management method based on safeguard protection |
| CN111091261A (en) * | 2019-10-14 | 2020-05-01 | 广东博力威科技股份有限公司 | Method for managing full life cycle of lithium battery |
| CN111091261B (en) * | 2019-10-14 | 2023-12-08 | 广东博力威科技股份有限公司 | Method for managing full life cycle of lithium battery |
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