CN103884904A - Battery pack voltage detecting device - Google Patents
Battery pack voltage detecting device Download PDFInfo
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- CN103884904A CN103884904A CN201410075120.8A CN201410075120A CN103884904A CN 103884904 A CN103884904 A CN 103884904A CN 201410075120 A CN201410075120 A CN 201410075120A CN 103884904 A CN103884904 A CN 103884904A
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Abstract
The invention relates to the technical field of battery detection, in particular to a battery pack voltage detecting device. The battery pack voltage detecting device comprises a current acquisition module, a voltage acquisition module and a micro-processing module. The current acquisition module is used for collecting the currents of all battery single bodies in a battery pack and the currents of preselected wires. The voltage acquisition module is used for collecting the voltages of all the battery single bodies in the battery pack and the voltages at the two ends of each preselected wire. The micro-processing module is connected with the current acquisition module and the voltage acquisition module, and is used for detecting the currents and the voltages, judging the voltages to be the voltages at the two ends of each wire when the detected voltages are changed in a linear mode or in an approximately linear mode along with the change of the currents and shielding the voltage values of the wires when the voltages of all the battery single bodies in the battery pack are calculated. According to the battery pack voltage detecting device, voltage signals of all the battery single bodies do not need to be rectified, the voltage acquisition module with respect to the wires does not need to be additionally arranged, the degree of automation is high in the judging process of the wires, and manual intervention is needless.
Description
Technical field
The present invention relates to battery detecting technical field, relate in particular to a kind of battery voltage pick-up unit.
Background technology
In hybrid power and pure electric sedan, battery is being played the part of more and more key player, because the voltage of cell is all lower with capacity, becomes electric battery and is encapsulated in shell so mostly need to carry out serial or parallel connection in actual application.Pure electric miniature series battery specification mainly contains 48V, 72V, 96V etc.The battery specification of pure electric sedan is in 300V left and right.For minicar and car, the space on car is extremely limited, has also caused maximum technological difficulties---and battery management system need to carry out across case collection the voltage of many casees battery.If do not addressed this problem, in Vehicle Driving Cycle or charging process, because line drop causes the voltage acquisition mistake of battery management system to lithium battery, can produce false alarm signal, when serious, can make the vehicle emergency of running at high speed stop, road safety is caused a hidden trouble.
Electric battery refers to across case voltage between the inside or electric battery and electric battery of electric battery, needs to connect with longer cable, to form electric loop because space structure relation causes between the battery cell that two joints are adjacent.In electric battery impulse electricity process, when electric current is flowed through this cable, and the voltage drop producing.This voltage drop is according to the difference of the connected mode of battery management system voltage acquisition line and battery, can cause the voltage of the two batteries voltage ratio reality that cable connects to exceed or the low 1-2V of going out.For ferric phosphate lithium cell group, the normal voltage of battery is 3.2V, charge cutoff voltage 3.9V, electric discharge cut-off 2.3V, because this voltage drop must exist, make normal cell voltage produce greatly deviation, battery management system thinks that battery damages, close by force electric energy output, make car load cannot continue operation.Classic method is all 1) adopt the method for voltage correction, by the electric current of line flows warp is sampled, error voltage is carried out to software compensation, the method practical operation complexity, very difficult acquisition cell voltage exactly.2) adopt multiple voltage acquisition modules, the method is applicable to hypotactic battery management system, in the place producing across case voltage, places a voltage acquisition module more, thereby skips the cable producing across case voltage.The method can gather voltage exactly, but need to have more a voltage acquisition module.
Summary of the invention
Technical matters to be solved by this invention is, proposes a kind of new battery voltage pick-up unit, realizes the accurate collection to having each battery cell voltage in the electric battery connecting compared with long lead.The present invention is achieved in that
A kind of battery voltage pick-up unit, described electric battery is connected by wire by some battery cells, comprising:
Current acquisition module, for gathering the electric current of described wire of the each battery cell of electric battery and preliminary election;
Voltage acquisition module, for gathering the voltage at described wire two ends of the each battery cell of described electric battery and preliminary election;
Micro treatment module, be connected with described current acquisition module and voltage acquisition module, for detection of described electric current and voltage, and judge the voltage of this voltage as wire two ends in the time that detected voltage is linearity or approximately linear variation with the variation of electric current, and in the time calculating the voltage of each battery cell in described electric battery, shield the magnitude of voltage of this wire.
Further, described voltage acquisition module comprises voltage acquisition winding displacement, battery change-over switch, differential signal treatment circuit;
Described voltage acquisition winding displacement comprises some voltage acquisition ends, for connecting each battery cell two ends;
Described battery change-over switch is connected with each voltage acquisition end, for switch described battery cell in the time gathering each battery cell voltage;
Described differential signal treatment circuit is connected with described battery change-over switch, for the voltage signal of the selected battery cell of described battery change-over switch is carried out to difference processing;
Described micro treatment module comprises an A/D converter, for receiving the differential signal after described differential signal processing circuit processes, and is converted into digital signal.
Compared with prior art, the present invention according to battery and the electric current of wire and the different judgements of change in voltage characteristic in the time that battery voltage detects, be connected between battery cell compared with long lead, in the time calculating the voltage of each battery cell in electric battery, mask the magnitude of voltage of this wire, thereby obtain the accurate voltage of the battery cell that is connected in these wire two ends.The present invention is without each battery cell voltage signal is proofreaied and correct, and without the extra voltage acquisition module increasing for wire, wire deterministic process automaticity is high, without manual intervention.
Accompanying drawing explanation
Fig. 1: the battery voltage pick-up unit schematic diagram that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.
Fig. 1 shows the composition schematic diagram of battery voltage pick-up unit provided by the invention.Shown in Fig. 1, this battery voltage pick-up unit comprises current acquisition module 3, voltage acquisition module 4 and micro treatment module 5.This electric battery comprises some battery cells 1, between each battery cell 1, connects by wire, can connect, also can be in parallel.Due to the reason such as space, position, between two battery cells 1 of therein certain, be connected with one section compared with long lead 2(as shown in Figure 1), certainly, perhaps in an electric battery more than one section this compared with long lead 2.
As everyone knows, due to scientific and technological progress, present electric battery is generally all exported by its electric energy of procedure auto-control, and controlling foundation is generally the voltage of this electric battery.When the voltage of electric battery exceeds a certain setting range, or when in electric battery, the voltage of a certain battery cell exceeds a certain setting range, program will be closed its electric energy output automatically, thereby play the object of protection self or equipment.Under this condition, the accurate detection of the voltage to each battery cell in electric battery seems very important, if can not accurately detect the voltage of each battery cell in electric battery, program is likely made erroneous judgement to electric battery so, think that certain battery cell 1 state is undesired in electric battery or electric battery, thereby mislead electric battery and close electric energy output, cause adverse consequences.The wire 2 of this section longer, if it is by larger electric current, its voltage drop producing in circuit just likely affects the accurate detection of the battery cell voltage to being connected in these wire 2 two ends.For being connected with compared with the electric battery of long lead 2 between this battery cell 1, realize accurately and detecting being connected in the battery cell voltage at wire 2 two ends, just must mask the impact that the voltage drop that produces on wire 2 produces.If do not detect the voltage on wire 2 or the magnitude of voltage of the wire 2 detecting shielded, can eliminate this impact, if each special corresponding one group of voltage acquisition cable in two battery cells 1 that wire 2 two ends connect, when so the voltage of each battery cell 1 collection, just can not collect the voltage drop on wire 2, thereby avoid the voltage drop on wire 2 to impact the voltage detecting of the battery cell that is connected in wire 2 two ends.
Based on above-mentioned consideration, longer wire 2 is considered as a battery cell by this device.Equally as shown in Figure 1, in in to electric battery, the voltage of each battery cell 1 detects, voltage to wire 2 two ends also detects, and then different according to the electric current of wire and battery and change in voltage characteristic, judge the voltage of corresponding lead 2, and by the magnitude of voltage shielding of this wire 2, thereby the accurate voltage of each battery cell 1 in acquisition electric battery.Below will describe principle of work of the present invention in detail.It should be noted that the wire that only has the voltage drop that those are produced may have influence on the accurate collection of the voltage to battery cell 1, be just necessary to be regarded as battery cell 1, and it is carried out to voltage detecting.Can determine according to the specification (as length) that is connected in the wire between two battery cells 1 whether this wire can have influence on the accurate detection of the voltage of the battery cell 1 to being connected in its two ends, thereby determine whether this wire is considered as to a battery cell 1, and it is carried out to voltage detecting.
This device gathers the electric current of each battery cell 1 by current acquisition module 3, by voltage acquisition module 4, the voltage of each battery cell 1 is gathered.The current signal of the each battery cell 1 collecting and voltage signal are sent to micro treatment module 5 by current acquisition module 3 and voltage acquisition module 4, is converted to current value and the magnitude of voltage of each battery cell 1 by the A/D converter 501 of micro treatment module 5.Voltage acquisition module 4 comprises voltage acquisition winding displacement 401, battery change-over switch 402, differential signal treatment circuit 403.Wherein, voltage acquisition winding displacement 401 comprises some voltage acquisition ends 4011, and voltage acquisition end 4011 can be connected in the two ends of each battery cell 1, for gathering the voltage at each battery cell 1 two ends.Battery change-over switch 402 is connected with the each voltage acquisition end 4011 on voltage acquisition winding displacement 401, for switch battery cell 1 in the time gathering each battery cell 1 voltage.The voltage signal at each battery cell 1 two ends is successively after voltage acquisition winding displacement 401, battery change-over switch 402, enter differential signal treatment circuit 403 and carry out difference processing, A/D converter 501 in differential signal input micro treatment module 5 after difference processing, micro treatment module 5 is converted into the magnitude of voltage of each battery cell 1, so that can carry out computing to it.Micro treatment module 5 is different according to the electric current of wire and battery and change in voltage characteristic, whether the current value of each battery cell 1 that judgement detects and magnitude of voltage meet electric current and the change in voltage characteristic of battery, if do not met, judge the magnitude of voltage of this magnitude of voltage as wire 2 two ends.To wire 2, micro treatment module 5 shields its magnitude of voltage, thereby avoids it to impact each battery cell 1 voltage detecting in electric battery.Generally speaking, wire in electric battery between each battery cell 1 can be considered as linear resistance or approximately linear resistance, its internal resistance is substantially constant, its volt-ampere characteristic is linearity or approximately linear, battery is not followed this rule, its internal resistance can present different variations in battery operated different phase, thereby causes its volt-ampere characteristic to be non-linear.This difference according to wire 2 with battery, micro treatment module 5 can judge that its detected voltage is the voltage at wire 2 two ends or the voltage at battery cell 1 two ends according to volt-ampere characteristic.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. a battery voltage pick-up unit, described electric battery is connected by wire by some battery cells, it is characterized in that, comprising:
Current acquisition module, for gathering the electric current of described wire of the each battery cell of electric battery and preliminary election;
Voltage acquisition module, for gathering the voltage at described wire two ends of the each battery cell of described electric battery and preliminary election;
Micro treatment module, be connected with described current acquisition module and voltage acquisition module, for detection of described electric current and voltage, and judge the voltage of this voltage as wire two ends in the time that detected voltage is linearity or approximately linear variation with the variation of electric current, and in the time calculating the voltage of each battery cell in described electric battery, shield the magnitude of voltage of this wire.
2. battery voltage pick-up unit as claimed in claim 1, is characterized in that, described voltage acquisition module comprises voltage acquisition winding displacement, battery change-over switch, differential signal treatment circuit;
Described voltage acquisition winding displacement comprises some voltage acquisition ends, for connecting each battery cell two ends;
Described battery change-over switch is connected with each voltage acquisition end, for switch described battery cell in the time gathering each battery cell voltage;
Described differential signal treatment circuit is connected with described battery change-over switch, for the voltage signal of the selected battery cell of described battery change-over switch is carried out to difference processing;
Described micro treatment module comprises an A/D converter, for receiving the differential signal after described differential signal processing circuit processes, and is converted into digital signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410075120.8A CN103884904B (en) | 2014-03-03 | 2014-03-03 | Battery voltage checkout gear |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410075120.8A CN103884904B (en) | 2014-03-03 | 2014-03-03 | Battery voltage checkout gear |
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| CN103884904A true CN103884904A (en) | 2014-06-25 |
| CN103884904B CN103884904B (en) | 2016-05-18 |
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| CN201410075120.8A Expired - Fee Related CN103884904B (en) | 2014-03-03 | 2014-03-03 | Battery voltage checkout gear |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105259509A (en) * | 2015-10-19 | 2016-01-20 | 深圳奥特迅电力设备股份有限公司 | Device and method of performing on-line measurement on connecting cable resistance between accumulators |
| CN106124993A (en) * | 2016-05-11 | 2016-11-16 | 法拉第未来公司 | The monitoring voltage of battery modules |
| CN108375738A (en) * | 2018-04-03 | 2018-08-07 | 东莞赛微微电子有限公司 | A kind of voltage sampling circuit and supply unit |
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| CN105259509A (en) * | 2015-10-19 | 2016-01-20 | 深圳奥特迅电力设备股份有限公司 | Device and method of performing on-line measurement on connecting cable resistance between accumulators |
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| CN106124993A (en) * | 2016-05-11 | 2016-11-16 | 法拉第未来公司 | The monitoring voltage of battery modules |
| CN106124993B (en) * | 2016-05-11 | 2019-04-26 | 法拉第未来公司 | The voltage monitoring of battery modules |
| CN108375738A (en) * | 2018-04-03 | 2018-08-07 | 东莞赛微微电子有限公司 | A kind of voltage sampling circuit and supply unit |
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| Publication number | Publication date |
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| CN103884904B (en) | 2016-05-18 |
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