CN202593309U - Automobile power-battery voltage-monitoring system - Google Patents
Automobile power-battery voltage-monitoring system Download PDFInfo
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- CN202593309U CN202593309U CN2012202682637U CN201220268263U CN202593309U CN 202593309 U CN202593309 U CN 202593309U CN 2012202682637 U CN2012202682637 U CN 2012202682637U CN 201220268263 U CN201220268263 U CN 201220268263U CN 202593309 U CN202593309 U CN 202593309U
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- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The utility model relates to an automobile power-battery voltage-monitoring system, which comprises an induction-coil group, an amplifying and integrating circuit, a comparison circuit, a main control module and a battery-voltage equalizing module, wherein the induction-coil group is arranged at a position which is close to an automobile power battery, and an output end of the induction-coil group is connected with the comparison circuit through the amplifying and integrating circuit; and the comparison circuit is also connected with a reference-voltage generating unit and a control-signal generating unit of the main control module, and the control-signal generating unit is connected with the automobile power battery through the battery-voltage equalizing module. By adopting the automobile power-battery voltage-monitoring system with the structure, the variation of an output voltage of the battery is induced by utilizing induction coils, and the variation quantity of the output voltage is judged, so that measurement errors are avoided to further equalize the battery, the voltage loss of a whole battery pack is reduced, and the work efficiency of a battery-managing system is improved; and the automobile power-battery voltage-monitoring system disclosed by the utility model has the advantages that the structure is simple, the cost is low, and the application range is also wider.
Description
Technical field
The utility model relates to the electric vehicle engineering field, and particularly electrokinetic cell watch-dog technical field specifically is meant a kind of automobile power cell voltage monitoring system.
Background technology
Power battery pack is a key components and parts of electronlmobil, and the voltage of power battery pack output provides the power of vehicle operation.But each batteries in the power battery pack is when work, because the characteristic of single battery is some difference, the voltage of outwards exporting is also inconsistent.If there is the voltage of a certain batteries output too small, tend to influence the normal operation of other battery in the battery pack, the output voltage of whole battery group is dragged down simultaneously, even has reduced the service life of battery.In order to guarantee the service life of battery, need monitor the output voltage of battery, at the voltage of finding cell output hour, battery is charged.
Traditional battery cell monitoring method mainly contains: divider resistance pressure drop method, floating ground method of measurement, analog switch gating method.The divider resistance pressure decline method mainly is through electric resistance partial pressure virtual voltage to be decayed to the acceptable voltage range of measured chip, carries out analogue to digital conversion then.But along with increasing of cell number, the monomer battery voltage measured error can increase along with the increase of CMV.When the floating ground method of measurement mainly was to use floating ground to measure battery terminal voltage, comparator judged automatically whether current active potential is suitable, if suitable direct startup analogue to digital conversion is measured; Otherwise can be through MCU through digital to analogy conversion to the active potential control of floating, thereby active potential is under the proper state.But this scheme influences the measurement effect of system because active potential disturbs down the accuracy that can reduce active potential control at the scene.The analog switch method mainly is select to measure passage through analog switch, carry out analogue to digital conversion for the output of selected tunnels analogy switch after through voltage follower, but this method needs higher operational precision, and cost is also higher.
Therefore, need a kind of variable quantity that can accurately judge each cell output voltage of battery pack badly in automobile power cell group field, and the voltage of respective battery is controlled, reduce the battery pack monitored control system of battery pack overall power.
The utility model content
The purpose of the utility model is to have overcome above-mentioned shortcoming of the prior art; Provide a kind of and can effectively avoid measured error, accurately judge the variable quantity of each cell output voltage of battery pack, and the voltage of respective battery is carried out equilibrium control; Thereby reduce the battery pack overall power; And simple in structure, with low cost, field of application is automobile power cell voltage monitoring system comparatively widely.
In order to realize above-mentioned purpose, the automobile power cell voltage monitoring system of the utility model has following formation:
This automobile power cell voltage monitoring system; Comprise the induction coil group, amplify integrating circuit, comparator circuit, main control module and cell pressure balance module; Described induction coil group is arranged at the position near described automobile power cell, and the mouth of this induction coil group connects the input end of described amplification integrating circuit; The mouth of described amplification integrating circuit connects the first input end of described comparator circuit; Described main control module comprises VREF (Voltage Reference) generation unit and control signal generation unit, and the mouth of described VREF (Voltage Reference) generation unit connects second input end of described comparator circuit; The mouth of described comparator circuit connects the input end of the control signal generation unit of described main control module; The mouth of this control signal generation unit connects the input end of described cell pressure balance module, and the mouth of this cell pressure balance module connects described automobile power cell.
In this automobile power cell voltage monitoring system, described automobile power cell is the power battery pack of being made up of a plurality of cells, and described induction coil group has and the identical induction coil of described cell quantity; The corresponding described cell of each induction coil, and be arranged at position near this cell; Each induction coil all connects the input end of described amplification integrating circuit.
In this automobile power cell voltage monitoring system, described each cell all has the cell bag, and described each induction coil all is packaged in the cell bag cooresponding with it.
In this automobile power cell voltage monitoring system; Described cell pressure balance module comprises the euqalizing current output unit; The mouth of described euqalizing current output unit connects described each cell, and the mouth of said master control module controls signal generation unit connects described euqalizing current output unit.
In this automobile power cell voltage monitoring system, described main control module also comprises memory cell, and the mouth of described comparator circuit is connected in this memory cell, and described memory cell also connects described control signal generation unit.
In this automobile power cell voltage monitoring system, described main control module also comprises alarm unit, and described alarm unit connects described control signal generation unit.
In this automobile power cell voltage monitoring system; Described automobile also comprises the electric motor that connects said electrokinetic cell; Described electric motor has the motor speed determination unit, and the control signal generation unit of described main control module also connects this motor speed determination unit.
In this automobile power cell voltage monitoring system; Described automobile has the vehicle control bus; Described automobile power cell, automobile power cell voltage monitoring system and electric motor all are connected in described vehicle control bus, and described control signal generation unit connects this motor speed determination unit through described vehicle control bus.
In this automobile power cell voltage monitoring system, described main control module is a micro controller system.
Adopted the automobile power cell voltage monitoring system of this utility model; Because it comprises the induction coil group, amplifies integrating circuit, comparator circuit, main control module and cell pressure balance module; Described induction coil group is arranged at the position near described automobile power cell, and mouth connects the input end of described amplification integrating circuit; The mouth that amplifies integrating circuit connects the first input end of described comparator circuit; The mouth of the VREF (Voltage Reference) generation unit of main control module connects second input end of described comparator circuit; The mouth of described comparator circuit connects the input end of the control signal generation unit of described main control module; The mouth of this control signal generation unit connects the input end of described cell pressure balance module, and the mouth of this cell pressure balance module connects described automobile power cell.Make this system to utilize and be distributed in electrokinetic cell induction coil induced cell output voltage variation on every side.Variable quantity through to the cell output voltage of power battery pack is judged; Find the bigger battery numbering of change of voltage, and this number battery is carried out equilibrium, thereby reduce the voltage loss of whole battery group; Because native system has adopted contactless induction coil to gather the variable quantity of cell output voltage; Thereby effectively avoided measured error of the prior art, improve the work efficiency of battery management system, and the automobile power cell voltage monitoring system of the utility model is simple in structure; With low cost, field of application is also comparatively extensive.
Description of drawings
Fig. 1 is the structural representation of the automobile power cell voltage monitoring system of the utility model.
The specific embodiment
In order more to be expressly understood the technology contents of the utility model, the special following examples of lifting specify.
See also shown in Figure 1ly, be the structural representation of the automobile power cell voltage monitoring system of the utility model.
In one embodiment, this automobile power cell voltage monitoring system comprises the induction coil group, amplifies integrating circuit, comparator circuit, main control module and cell pressure balance module.Described automobile power cell is the power battery pack of being made up of a plurality of cells, and described induction coil group has and the identical induction coil of described cell quantity; The corresponding described cell of each induction coil, and be arranged at position near this cell; Each induction coil all connects the input end of described amplification integrating circuit.The mouth of described amplification integrating circuit connects the first input end of described comparator circuit; Described main control module comprises VREF (Voltage Reference) generation unit and control signal generation unit, and the mouth of described VREF (Voltage Reference) generation unit connects second input end of described comparator circuit; The mouth of described comparator circuit connects the input end of the control signal generation unit of described main control module; The mouth of this control signal generation unit connects the input end of described cell pressure balance module, and the mouth of this cell pressure balance module connects described automobile power cell.Described main control module can adopt micro controller system.
In a kind of more preferably embodiment, described each cell all has the cell bag, and described each induction coil all is packaged in the cell bag cooresponding with it.
At another kind more preferably in the embodiment; Described cell pressure balance module comprises the euqalizing current output unit; The mouth of described euqalizing current output unit connects described each cell, and the mouth of said master control module controls signal generation unit connects described euqalizing current output unit.This cell pressure balance module is common batteries monomer battery voltage balance protection module, and it does not rely on software, and realizes its function equalization function through hardware.This cell pressure balance module is behind the control signal that receives from main control module, and to cooresponding cell output euqalizing current in the control signal, to improve this cell output voltage, the output voltage that dwindles between each cell is poor.
In a kind of further preferred embodiment; Described main control module also comprises memory cell and alarm unit; The mouth of described comparator circuit is connected in this memory cell, and described memory cell all is connected described control signal generation unit with alarm unit.
A kind of further preferred embodiment in; Described automobile also comprises the electric motor that connects said electrokinetic cell; Described electric motor has the motor speed determination unit, and the control signal generation unit of described main control module also connects this motor speed determination unit.
In a kind of preferred embodiment; Described automobile has the vehicle control bus; Described automobile power cell, automobile power cell voltage monitoring system and electric motor all are connected in described vehicle control bus, and described control signal generation unit connects this motor speed determination unit through described vehicle control bus.
In practical application, the automobile power cell voltage monitoring system of the utility model, as shown in Figure 1, in the power brick of each cell of power battery pack, induction coil is set.Because the inducing current that induction coil induces is less, so need to be then to compare with reference voltage in the comparator circuit through amplification, integrating circuit, reference voltage is that the D/A converting circuit of being controlled by MCU is exported.The I/O port of level signal after the comparison being delivered to MCU also stores, through after the judgement of MCU the lower cell of voltage being carried out equilibrium control.
When electrokinetic cell in discharge or during charge condition, if the voltage generation instantaneous variation of cell then can produce magnetic field around it, the induction coil in magnetic field produces inducing current.Be utilized in the inducing current of placing in the power brick that induction coil produced electromagnetic field judged, with the inducing current that collects amplify, integration, and compare with reference voltage.Reference voltage utilizes MCU control, uses reference voltage U
REFWith the voltage U of gathering
GIn comparator circuit, accomplish relatively, the result after the comparison (being high and low level) is delivered to MCU and storage on the master board.
With the voltage U of gathering
GWith reference voltage U
REFCompare, can obtain following several kinds of situation:
(1) U
REF＜U
G: the voltage that battery output is described has bigger variation.At this moment, need to judge the residing state of vehicle:
If the i vehicle is under driving states, state that can be through the monitoring vehicle motor is promptly monitored whether accelerated service, judges whether this section period change of voltage of battery output belongs to normal circumstances.If the motor accelerated service judges that then the output voltage variation of battery belongs to normal circumstances, MCU can not send alerting signal; Otherwise MCU sends alerting signal, and the prompting cell output voltage exists unusual, and MCU will start battery balanced module.
If the ii vehicle under charge condition, is then explained cell pressure have unusually, send alerting signal and point out battery need carry out equilibrium to MCU.
(2), U
REF>=U
G: the not bigger variation of output voltage of battery is described.At this moment, no matter vehicle is at driving states or charge condition, judges that this moment cell output voltage is changed to normal circumstances, does not send alerting signal to MCU and does not also start battery balanced module.
For example, when vehicle going or electrically-charged process in, No. 1 cell output voltage of power battery pack moment produces 100mV and changes, its cooresponding induction coil will produce the inducing current Ig about 110uA.Inducing current Ig exports the voltage U about 3.3V after through amplification, integrating circuit
G, and with reference voltage U
REF(3V) compare, the result after relatively is " 1 " and be dealt into MCU for high level, and stores.
Because U
G>U
REF, explaining that No. 1 monomer battery voltage is lower, MCU sends alerting signal, starts battery balanced module simultaneously No. 1 cell is charged.
If vehicle go or electrically-charged process in, the moment that 50mV takes place No. 3 cell output voltages of power battery pack becomes, its cooresponding induction coil is about the inducing current Ig about 60uA with generation.Inducing current Ig exports the voltage U about 1.8V after through amplification, integrating circuit
G, and with reference voltage U
REF(3V) compare, the result after relatively is " 0 " and be dealt into MCU for low level, and stores.
Because U
G＜U
REF, explaining that then No. 3 monomer battery voltages change in normal range, MCU can not send alerting signal can not open battery balanced module yet.
In the automobile power cell voltage monitoring systems technology scheme of the utility model; Each wherein included functional module and modular unit all can be corresponding to the particular hardware circuit in the integrated circuit structure; Therefore these modules and unit only utilize hardware circuit just can realize, need not assist with specific Control Software and promptly can realize corresponding function automatically.
Adopted the automobile power cell voltage monitoring system of this utility model; Because it comprises the induction coil group, amplifies integrating circuit, comparator circuit, main control module and cell pressure balance module; Described induction coil group is arranged at the position near described automobile power cell, and mouth connects the input end of described amplification integrating circuit; The mouth that amplifies integrating circuit connects the first input end of described comparator circuit; The mouth of the VREF (Voltage Reference) generation unit of main control module connects second input end of described comparator circuit; The mouth of described comparator circuit connects the input end of the control signal generation unit of described main control module; The mouth of this control signal generation unit connects the input end of described cell pressure balance module, and the mouth of this cell pressure balance module connects described automobile power cell.Make this system to utilize and be distributed in electrokinetic cell induction coil induced cell output voltage variation on every side.Variable quantity through to the cell output voltage of power battery pack is judged; Find the bigger battery numbering of change of voltage, and this number battery is carried out equilibrium, thereby reduce the voltage loss of whole battery group; Because native system has adopted contactless induction coil to gather the variable quantity of cell output voltage; Thereby effectively avoided measured error of the prior art, improve the work efficiency of battery management system, and the automobile power cell voltage monitoring system of the utility model is simple in structure; With low cost, field of application is also comparatively extensive.
In this specification sheets, the utility model is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and the scope of the utility model.Therefore, specification sheets and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (9)
1. automobile power cell voltage monitoring system; It is characterized in that; Described system comprises the induction coil group, amplifies integrating circuit, comparator circuit, main control module and cell pressure balance module; Described induction coil group is arranged at the position near described automobile power cell, and the mouth of this induction coil group connects the input end of described amplification integrating circuit; The mouth of described amplification integrating circuit connects the first input end of described comparator circuit; Described main control module comprises VREF (Voltage Reference) generation unit and control signal generation unit, and the mouth of described VREF (Voltage Reference) generation unit connects second input end of described comparator circuit; The mouth of described comparator circuit connects the input end of the control signal generation unit of described main control module; The mouth of this control signal generation unit connects the input end of described cell pressure balance module, and the mouth of this cell pressure balance module connects described automobile power cell.
2. automobile power cell voltage monitoring according to claim 1 system; It is characterized in that; Described automobile power cell is the power battery pack of being made up of a plurality of cells, and described induction coil group has and the identical induction coil of described cell quantity; The corresponding described cell of each induction coil, and be arranged at position near this cell; Each induction coil all connects the input end of described amplification integrating circuit.
3. automobile power cell voltage monitoring according to claim 2 system is characterized in that described each cell all has the cell bag, and described each induction coil all is packaged in the cell bag cooresponding with it.
4. automobile power cell voltage monitoring according to claim 2 system; It is characterized in that; Described cell pressure balance module comprises the euqalizing current output unit; The mouth of described euqalizing current output unit connects described each cell, and the mouth of said master control module controls signal generation unit connects described euqalizing current output unit.
5. automobile power cell voltage monitoring according to claim 1 system; It is characterized in that; Described main control module also comprises memory cell, and the mouth of described comparator circuit is connected in this memory cell, and described memory cell also connects described control signal generation unit.
6. automobile power cell voltage monitoring according to claim 1 system is characterized in that described main control module also comprises alarm unit, and described alarm unit connects described control signal generation unit.
7. according to each described automobile power cell voltage monitoring system in the claim 1 to 6; It is characterized in that; Described automobile also comprises the electric motor that connects said electrokinetic cell; Described electric motor has the motor speed determination unit, and the control signal generation unit of described main control module also connects this motor speed determination unit.
8. automobile power cell voltage monitoring according to claim 7 system; It is characterized in that; Described automobile has the vehicle control bus; Described automobile power cell, automobile power cell voltage monitoring system and electric motor all are connected in described vehicle control bus, and described control signal generation unit connects this motor speed determination unit through described vehicle control bus.
9. automobile power cell voltage monitoring according to claim 1 system is characterized in that described main control module is a micro controller system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012202682637U CN202593309U (en) | 2012-06-08 | 2012-06-08 | Automobile power-battery voltage-monitoring system |
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| CN2012202682637U CN202593309U (en) | 2012-06-08 | 2012-06-08 | Automobile power-battery voltage-monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678158A (en) * | 2015-01-29 | 2015-06-03 | 北京新能源汽车股份有限公司 | High-voltage power-on display device of electric automobile |
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2012
- 2012-06-08 CN CN2012202682637U patent/CN202593309U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678158A (en) * | 2015-01-29 | 2015-06-03 | 北京新能源汽车股份有限公司 | High-voltage power-on display device of electric automobile |
| CN104678158B (en) * | 2015-01-29 | 2017-12-19 | 北京新能源汽车股份有限公司 | High-voltage power-on display device of electric automobile |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20180608 |