CN109119706A - It is able to detect the battery pack and battery module of contact point - Google Patents
It is able to detect the battery pack and battery module of contact point Download PDFInfo
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- CN109119706A CN109119706A CN201710479912.5A CN201710479912A CN109119706A CN 109119706 A CN109119706 A CN 109119706A CN 201710479912 A CN201710479912 A CN 201710479912A CN 109119706 A CN109119706 A CN 109119706A
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- battery
- battery unit
- transformer
- resistance
- battery module
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
Disclose the battery pack and battery module for being able to detect contact point.Battery pack may include at least the first battery module, the second battery module, the first isolation circuit and the second isolation circuit.Each battery module includes at least the first battery unit and the second battery unit, and in the power connection wire for the second electrode for coupling the first electrode of the first battery unit to the second battery unit.First battery unit includes monitor.First isolation circuit and the second isolation circuit also provide voltage transmission path while providing isolation.Monitor includes: emitter/receiver, for carrying out signal communication via communication conductor and the second battery unit；And it is coupled to the difference voltage detector of power connection wire and voltage transmission path, for detecting the voltage difference between power connection wire and voltage transmission path, wherein the contact point of monitor indicated horsepower connecting line in the case where detected voltage difference exceeds predetermined threshold range degrades.
Description
Technical field
The present invention relates generally to battery packs, the more particularly, to method and apparatus of the monitoring in battery pack.
Background technique
Power supply is widely used in by the battery pack that multiple series-connected cell units are formed, especially in movable electrical appliances.Many institutes
Known, in (hybrid) electric vehicle, battery pack (battery pack) is used to high voltage with driving motor.Herein
In class battery pack, multiple battery units (battery cell) are by conductive power connection wire series coupled, wherein every function
The positive electrode of one battery unit can be electrically coupled to the negative electrode of adjacent cell by rate connecting line, such as pass through welding or spiral shell
It tethers and connects.
Each component on current path in battery pack is preferably designed to have small resistance to reduce useless function
Rate dissipates, especially when the electric current for flowing through battery unit is larger (for example, several hundred amperes).Under normal conditions, power connection wire
Contact point resistance between battery electrode can be included into consideration.In addition, the contact point resistance be corroded in contact point, loosen,
It will will increase when aging.If battery pack current is higher, even if the contact point resistance of only 1 milliohm (1m Ω)
It will be difficult to receive.For example, will generate the power dissipation of 10W in the case where battery pack current is 100A, this is not phase
It hopes.In addition, high contact point resistance will lead to hot spot, this can seriously limit the service life of involved battery unit.In heavy corrosion
Situation in, temperature rising possibly even cause it is on fire or explosion.
Therefore, the method and apparatus for the contact point detection in battery pack are desired.
Summary of the invention
The invention discloses the battery packs and battery module that are able to detect contact point.
In one embodiment, a kind of battery pack is disclosed.The battery pack may include at least the first battery module, the second electricity
Pond module, the first isolation circuit and the second isolation circuit.Each battery module includes at least the first battery unit and the second battery
Unit, and in the power for the second electrode for coupling the first electrode of first battery unit to second battery unit
Connecting line.First battery unit includes monitor.First isolation circuit is coupled to first battery module, and described first
Isolation circuit includes the first transformer, first resistor and second resistance, and the both ends of the first side of first transformer are coupled to
Between the both ends of second side that first battery module, the first resistor and second resistance are serially connected in the transformer, institute
State first resistor and second resistance tie point be connected to first battery module a wherein battery unit monitor.The
Two isolation circuits are coupled to second battery module, and second isolation circuit includes the second transformer, 3rd resistor and the
Four resistance, the both ends of the first side of second transformer are coupled to second battery module, and the of second transformer
Two sides connect second side of first transformer, and the 3rd resistor and the 4th resistance are serially connected in the of second transformer
Between the both ends of two sides, and the tie point of the 3rd resistor and the 4th resistance is connected to wherein the one of second battery module
The second electrode of battery unit.The monitor includes: emitter/receiver, for via communication conductor and second electricity
Pool unit carries out signal communication；And it is coupled to the difference voltage detector of the power connection wire and the voltage conductor, it is used for
The voltage difference between the power connection wire and the voltage conductor is detected, wherein the monitor is in detected voltage difference
Indicate that the contact point of the power connection wire degrades in the case where beyond predetermined threshold range.
In one aspect, first isolation circuit further includes first capacitor, and one end of the first capacitor is connected to institute
The tie point between first resistor and second resistance is stated, the other end of the first capacitor connects its of first battery module
In a battery unit first electrode.
In one aspect, first isolation circuit further includes the second capacitor and third capacitor, first transformer
The both ends of first side are capacitively coupled to first battery module by second capacitor and third respectively.
In one aspect, first isolation circuit further includes the 4th capacitor and the 5th capacitor, second transformer
The both ends of first side pass through the 4th capacitor and the 5th respectively and are capacitively coupled to second battery module.
In one aspect, the difference voltage detector is configured in the emitter/receiver just via the communication
Conducting wire detects the voltage difference when receiving signal communication.
In one aspect, occur in current field or voltage domain via the signal communication of the communication conductor, and
The D/C voltage that the difference voltage detector detects between the power connection wire and the communication conductor is poor.
In one aspect, it includes at least one of contact spot corrosion or contact point loosening that the contact point, which degrades,.
In one aspect, the monitor is integrated in first battery unit, wherein the difference voltage detector coupling
It is bonded to the first electrode of first battery unit；Or the monitor is outside first battery unit, wherein described
Difference voltage detector is coupled to the power connection wire.
In one aspect, the monitor further comprises the voltage for being coupled to another electrode of first battery unit
Difference detector.
In another embodiment, disclose a kind of battery module, including at least the first battery unit, the second battery unit,
Isolation circuit and second electrode for coupling the first electrode of first battery unit to second battery unit
Power connection wire.First battery unit includes monitor.Isolation circuit includes transformer, first capacitor, first resistor
And second resistance, the both ends of the first side of the transformer are coupled to first battery unit, second side of the transformer
Be adapted to another battery module, the first resistor and second resistance be serially connected in second side of the transformer both ends it
Between, the tie point of the first resistor and second resistance is connected to the monitor of the first battery unit via voltage conductor.It is described
Monitor includes: emitter/receiver, for carrying out signal communication via communication conductor and second battery unit；And
Be coupled to the difference voltage detector of the power connection wire and the voltage conductor, for detect the power connection wire with it is described
Voltage difference between voltage conductor, wherein the monitor is in the case where detected voltage difference exceeds predetermined threshold range
Indicate that the contact point of the power connection wire degrades.
In another embodiment, a kind of connection component is disclosed, two adjacent battery modules of battery pack are adapted to,
The connection component includes the first isolation circuit and the second isolation circuit.First isolation circuit is coupled to the first battery module, institute
Stating the first isolation circuit includes the first transformer, first resistor and second resistance, the both ends of the first side of first transformer
Be coupled to first battery module, the first resistor and second resistance be serially connected in second side of the transformer both ends it
Between, the tie point of the first resistor and second resistance is connected to the monitoring of a wherein battery unit for first battery module
Device.Second isolation circuit is coupled to the second battery module, and second isolation circuit includes the second transformer, 3rd resistor and the
Four resistance, the both ends of the first side of second transformer are coupled to second battery module, and the of second transformer
Two sides connect second side of first transformer, and the 3rd resistor and the 4th resistance are serially connected in the of second transformer
Between the both ends of two sides, and the tie point of the 3rd resistor and the 4th resistance is connected to wherein the one of second battery module
The second electrode of battery unit.
Through the invention, contact point degrades (for example, corrosion or loosening) or starts to degrade and can be detected by monitor, and nothing
External module or conducting wire need to be added to battery pack.By simply monitoring the electricity between power connection wire and corresponding communication conductor
Pressure difference can measure the increase of contact point resistance for every individual power connection wire in battery pack.Institute is in need additional
Circuit can be easily integrated into battery unit monitor.Such detection is beneficial to improve the performance of battery pack, and extension is filled again
Battery life between electricity, and avoid the potential damage to battery pack.
Detailed description of the invention
For the above objects, features and advantages of the present invention can be clearer and more comprehensible, below in conjunction with attached drawing to tool of the invention
Body embodiment elaborates, in which:
Fig. 1 is the top view of exemplary battery group according to an embodiment of the invention；
Fig. 2 schematically depicts the principle frame of the battery pack according to an embodiment of the invention with integrated monitoring device
Figure；
Fig. 3 A is the block diagram of the battery pack according to an embodiment of the invention with integrated monitoring device；
Fig. 3 B is the block diagram of the battery pack according to another embodiment of the present invention with integrated monitoring device；
Fig. 4 is the block diagram of the battery pack with integrated monitoring device of another embodiment according to the present invention；
Fig. 5 is the block diagram of the battery unit according to an embodiment of the invention with integrated monitoring device；
Fig. 6 is the block diagram with the battery pack of multiple battery modules；And
Fig. 7 is the block diagram of the battery pack according to an embodiment of the invention with isolation circuit.
Specific embodiment
The detailed description illustrated with reference to the accompanying drawing is intended as the description of exemplary embodiment of the present invention, and is not intended to
It indicates wherein practice only exemplary embodiment of the invention.This detailed description includes detail to provide to this explanation
The thorough understanding of the exemplary embodiment of book.For those skilled in the art it will be apparent that, can also without these details
Practice the exemplary embodiment of this specification.In some instances, well known structure and equipment are shown in block diagram form in order to avoid falling into oblivion
The exemplary embodiment not being presented herein.
It is used only as through wording used in this application " example " or " exemplary " illustrative and not limiting.Furthermore it will be understood that, when
One element referred to as " is connected to " or when " being coupled to " another element, which can be directly connected to or be coupled to another element
Or intervening elements may be present.For having the reference label (such as, " 202a " or " 202b ") of alphabetic character title, the letter
Character title can distinguish two similar components or element present in same attached drawing.Cover an appended drawing reference in intention all
When there is all components of same reference numerals in attached drawing, such letter character label can be omitted.
The top view for the exemplary battery group 100 that Fig. 1 is made of multiple battery units 110.For clarity, battery pack
100 are shown to have 8 battery units 110.It should be understood, however, that battery pack according to the present invention can have more or less batteries
Unit.Battery unit 110 is by conductive 102 series coupled of power connection wire, and power connection wire 102 is by battery unit
Positive electrode is connected to the negative electrode of adjacent cell.Such power connection wire 102 can be by welded or through being bolted
Contact point 104 etc. be electrically connected to battery cell electrode.
Fig. 2 schematically depicts the frame of the battery pack 200 according to an embodiment of the invention with integrated monitoring device 212
Figure.Battery pack 200 includes by the concatenated multiple battery units 210 of power connection wire 202 (for example, 202a, 202b).Each battery
Unit 210 has positive electrode A and negative electrode B.Each terminal of power connection wire 202 can be by welded or through being bolted
Contact point etc. be electrically coupled to corresponding battery cell electrode.
Fig. 2 is also shown and the concatenated optional converting resistor Rconv of battery unit 210.Optional electric current prison
Visual organ 220 can detecte the pressure drop across resistor Rconv, effectively reflect the battery pack for flowing through series-connected cell unit 210
Electric current and thus can be used for monitor purpose.Battery pack 200 can further comprise battery controller 230 with based on detecting
Measure and/or input a command for the operation of control battery pack 200.Battery unit 210 (and current monitor 220, if being applicable in)
It can be communicated by daisy chain type communication conductor 206 with battery controller 230.Specifically, will be in any battery unit 210
The signal transmitted between battery controller 230 may pass through positioned at other battery units 210 (or other groups between them
Part, if having).
An embodiment according to the present invention, one or more battery unit 210 can have for the battery unit 210 to
The integrated monitoring device 212 of contact point detection is carried out less.Such monitor 212 can be integrated in battery unit 210.Alternatively, it supervises
Control device 212 can be structured in battery pack 200 and outside associated battery unit 210, preferably as close to being supervised
Depending on battery unit.
An embodiment according to the present invention, battery unit 210 are that associated monitor 212 supplies voltage VDD and VSS,
Wherein the DC level of communication conductor 206 can be configured to the VDD for the monitor 212 being transmitted based on (for example, being equal to).Just
During normal situation, the power connection wire 202 between every a pair of battery unit 210 has identical as the battery cell electrode connected
The current potential of (or essentially identical), and thus may act as the signal ground (VSS) of respective communication conducting wire 206.Power connection wire 202
Voltage difference between corresponding communication conductor 206 is approximately equal to 0 or (VDD-VSS), this, which depends on which monitor 212, is leading to
It is transmitted on letter conducting wire 206.
However, if the contact point between power connection wire 202 and battery cell electrode degrade (for example, burn into loosen,
Or be otherwise damaged), then the contact point resistance between power connection wire 202 and battery cell electrode will increase and cause
The pressure drop of increase.Correspondingly, the current potential in current path in degradation contact point downstream will decline for normal conditions, and
And the voltage difference between power connection wire 202 and corresponding communication conductor 206 will change.Therefore, it is possible to keep monitor 212 logical
The voltage difference crossed between monitoring power connection wire 202 and corresponding communication conductor 206 monitors to execute contact point.Specifically,
With the associated monitor 212 of battery unit 210 be configured to measure power connection wire 202 and corresponding communication conductor 206 it
Between voltage difference, and the voltage difference that can be will test is made comparisons with threshold value, to find out whether contact point impaired (for example, rotten
Erosion, loosening etc.), as described in greater detail below.
Fig. 3 A is the battery pack with integrated monitoring device 212 of the unilateral monitoring configuration in an embodiment according to the present invention
Block diagram.As explanation, two battery units 210-1 and 210-2 in battery pack are shown, and they pass through power connection wire
202b is connected to each other at node C and D.Monitor 212-1 and 212-2 are integrated in battery unit 210-1 and 210-2 respectively.
Note that line segment BC or AD indicate the electrode of respective battery unit 210.Other battery units in battery pack can be similarly configured.
Monitor 212 respectively may include digital circuit 326, and digital circuit 326 is for executing analysis to the measurement detected
Or the behaviour of battery unit 210 is controlled based on these measurements and/or the order from battery controller 230 (referring to fig. 2)
Make.Emitter/receiver (TRx) 328 can also be provided to carry out signal communication via communication conductor 206.For example, TRx 328 can
Information is received from digital circuit 326 and passes it to other battery units 210 and/or transmitting via communication conductor 206
To battery controller 230.In addition, TRx 328 can be via communication conductor 206 from other battery units 210 and/or battery pack control
Device 230 processed receives signal and passes it to digital circuit 326.
An embodiment according to the present invention, each monitor 212 may include at least the one of associated battery unit 210
The difference voltage detector 312 of a electrode side, it is power connection wire 202 (for example, 202a, 202b, 202c ...) and corresponding for measuring
Communication conductor 206 (for example, 206a, 206b, 206c ...) between voltage difference.As mentioned above, such voltage difference reflection
Contact point situation between power connection wire 202 and battery cell electrode.As shown in fig. 3,312 quilt of difference voltage detector
It is coupled to the negative electrode of associated battery unit 210.
Communication on communication conductor 206 can carry out in current field or voltage domain.If communication is connect in current field
The virtual ground that associated difference voltage detector 312 is served as in side is received, which can directly connect in power
DC measurement is executed between line 202 and communication conductor 206.On the other hand, if communication is in voltage domain, voltage difference measurements can
It is carried out when the output of transmitter is in earthing potential.In addition, filtering can be used or periodically lead power connection wire and communication
D/C voltage difference between line is separated from the signal of communication on communication conductor 206.Even if being communicated in no information needs
When transmitting on conducting wire 206, digital circuit 326 can also indicate that Trx 328 is transmitted on communication conductor 206 based on scheduled timing
Empty signal, to be used for voltage difference measurements purpose.Since each monitor 212 (specifically, digital circuit 326) knows that communication is led
Any communication is just being carried out on line 206, therefore digital circuit 326 can control difference voltage detector 312 and execute in the appropriate time
Voltage difference measurements.
When monitor 212 is located in battery unit 210, battery unit 210 is respectively from positive electrode A and negative electrode B to prison
It controls device 212 and supplies voltage VDD and VSS.At nominal conditions, as TRx 328-1 on communication conductor 206b from battery unit
When 210-2 receives signal communication, difference voltage detector 312-1 will be detected between power connection wire 202b and communication conductor 206b
To 0 (or small) voltage difference.Otherwise, if contact point C (or D) between power connection wire 202b and associated battery cell electrode
When degrading and thus there is the resistance increased, the pressure drop that will have increase on the contact point of degradation, so as to cause battery unit 210-1
Negative electrode B on current potential decline.Therefore, when TRx 328-1 is received on communication conductor 206b, difference voltage detector
312-1 will detect that voltage difference changes between power connection wire 202b and communication conductor 206b.If the voltage difference detected
(for example, its absolute value) has exceeded scheduled threshold range (for example, being more than predetermined threshold), then difference voltage detector 312-1
Capable of emitting signal is degraded with the contact point of indicated horsepower connecting line 202b.For example, difference voltage detector 312-1 can be to TRx 328-
1 sends alarm signal, and TRx 328-1 sends the alarm signal to battery controller 230 in turn.
Similarly, electricity when receiving signal communication on communication conductor 206c as TRx 328-2, in battery unit 210-2
Pressure detector 312-2 can monitor that power connects by the voltage difference between measurement power connection wire 202c and communication conductor 206c
The contact point situation of wiring 202c.In an identical manner, it is possible to monitor power connection wire 202 in battery pack with it is associated
Being had point of contact between battery cell electrode.
Alternatively, as shown in Figure 3B, difference voltage detector 312 can be coupled to associated battery unit 210 just
Electrode A.Under normal circumstances, when receiving signal communication on communication conductor 206b as TRx 328-2, in battery unit 210-2
Difference voltage detector 312-2 will detect that normal voltage is poor (for example, electricity between power connection wire 202b and communication conductor 206b
The VDD-VSS of pool unit 210-1).Otherwise, if contact between power connection wire 202b and associated battery cell electrode
Point C (or D) degrades and thus has the resistance increased, then the current potential (VDD) on the positive electrode A of battery unit 210-1 will decline.
Therefore, difference voltage detector 312-2 will detect that voltage difference changes between power connection wire 202b and communication conductor 206b.Such as
The voltage difference that fruit detects has exceeded scheduled threshold range (for example, lower than predetermined threshold), then difference voltage detector 312-2 can
Signal is issued to degrade with the contact point of indicated horsepower connecting line 202b.
Similarly, the difference voltage detector 312-1 in battery unit 210-1 can be by measuring power connection wire 202a and leading to
The voltage difference between conducting wire 206a is believed to monitor the contact point situation of power connection wire 202a.As above, pass through each monitor 212
There is difference voltage detector 312 on the positive electrode A or negative electrode B of associated battery unit 210, it is possible to monitor battery pack
In power connection wire 202 and associated battery cell electrode between had point of contact.
Fig. 4 is the block diagram of the battery pack according to another embodiment of the present invention with integrated monitoring device 212.Fig. 4 is similar to
Fig. 3, the difference is that monitor 212 is structured in outside associated battery unit 210.Correspondingly, to node A and B
It is specified to indicate battery cell electrode A and B and its contact point with power connection wire 202.In this configuration, battery unit 210
Respectively from be coupled to the power connection wire 202 of positive electrode A and negative electrode B to associated monitor 212 supply voltage VDD and
VSS.In addition, difference voltage detector 312 can be coupled to power connection wire 202.
As above, if the contact point (for example, node A or B of battery unit 210-1) to degrade causes current potential to decline, work as TRx
For 328-1 when being transmitted on communication conductor 206b, difference voltage detector 312-1 will be in power connection wire 202b and communication conductor
Detect that voltage difference changes between 206b.Voltage difference between power connection wire 202b and communication conductor 206b impliedly reflects
Voltage across battery unit 210-1.If the voltage difference detected has exceeded scheduled threshold range (for example, lower than predetermined threshold
Value), then the capable of emitting signal of difference voltage detector 312-1 is to indicate battery unit 210-1 and power connection wire 202a or 202b
Contact point degrades.Each battery unit 210 can be similarly detected.
Alternatively, if difference voltage detector 312 is coupled to the power on the positive electrode A of associated battery unit 210
Connecting line 202 and corresponding communication conductor 206, then the contact point A (or B) of the degradation of battery unit 210-1 causes power to connect
Current potential decline on line 202a.Electricity when TRx 328-2 is received on communication conductor 206b, in battery unit 210-2
Pressure detector 312-2 will detect that voltage difference changes between power connection wire 202b and communication conductor 206b.If detection
To voltage difference have exceeded scheduled threshold range (for example, lower than predetermined threshold), then the capable of emitting letter of difference voltage detector 312-2
Number degraded with the contact point for indicating battery unit 210-1 and power connection wire 202a or 202b.Each battery unit 210 can be similar
Ground is detected.
Fig. 5 is the electricity in the battery pack with integrated monitoring device of the bilateral monitoring configuration in an embodiment according to the present invention
The block diagram of pool unit.Specifically, monitor 212 can include difference voltage detector in two electrode sides of battery unit 210
312.For example, difference voltage detector 312a is coupled to power connection wire 202a and corresponding communication conductor 206a, and voltage difference is examined
It surveys device 312b and is coupled to power connection wire 202b and corresponding communication conductor 206b.Difference voltage detector 312a and 312b with it is aforementioned
The difference voltage detector 312 for being coupled respectively to positive electrode side and negative electrode side similarly operates.Although monitor 212 is illustrated as collecting
At in battery unit 210, but monitor 212 can also be structured in outside battery unit 210 according to similar fashion shown in Fig. 4
Portion.There are two difference voltage detectors can monitor that power connection wire 202 and corresponding communication are led always for tool in each monitor
Line 206, regardless of the signal communication direction on communication conductor 206 how, thus provides and reaches high automotive safety requirement (example
Such as, ASIL) redundancy, this is desired in automotive vehicles applications.
Optionally, monitor 212 can further comprise for monitoring the ADC322 of the voltage across battery unit 210, using
In the temperature sensor 324 of the temperature in continuously monitoring battery unit 210, pressure sensor (not shown) and for surveying
Measure the other sensors of the other parameters of battery unit 210.Digital circuit 326 can receive and analyze various measurements to determine battery
The health status of unit over time, and electricity is controlled based on these measurements or the order from battery controller 230
The operation of pool unit 210.
In one embodiment, difference voltage detector 312 described above can realize that the comparator is matched with comparator
The voltage difference (or its absolute value) that will be measured is set to make comparisons with predetermined threshold.Once the voltage difference measured is more than threshold value,
The comparator just can trigger to signal to digital circuit 326 or battery controller 230.The threshold range (or threshold value) can be with
It is that may be programmed or can configure, to optimize the system for different application and usage scenario.Such threshold range (or threshold value)
It can be determined based on normal range (NR) (or normal value) and appropriate surplus.It is non-limiting as example, it is assumed that normal contact point tool
There are the typical resistances of 0.1 milliohm and battery pack current has the peak value of 200A, then result obtains in " normal " range
The peak value contact point voltage of 20mV.Appropriate threshold value for comparator can be set as 40mV, this is electric by the contact point for allowing to double
Resistance.The global restriction that surplus may depend on concrete application and apply to battery pack.
In another embodiment, difference voltage detector 312 described above can use Schmidt trigger (Schmitt
Trigger it) realizes.Schmidt trigger is that have built-in trigger voltage and sluggish a kind of comparator.By this method, every
Voltage difference between power connection wire communication conductor associated there can be measured always, regardless of on communication conductor 206
How is signal communication direction.
In an alternate embodiment, difference voltage detector 312 can be realized with analog-digital converter (ADC), to sense power company
Voltage difference between wiring 202 and communication conductor 206.The voltage difference measured can be converted into digital value and is sent to by ADC
To digital circuit 326 to be handled.In this case, digital circuit 326 may include comparator or software routines with determination
Whether the voltage difference is higher or lower than threshold value.It is digitized the advantage is that " contact point " voltage that can will be measured is divided by battery
Group electric current, so as to measure contact point resistance it is expected accuracy.In some applications, ADC 322 can be division multiplexed with
Alternately conversion battery cell voltage or the voltage difference measured.Correspondingly, difference voltage detector 312 can be eliminated.
The information that is detected by difference voltage detector 312 and TRx can be passed through by other measurements that monitor 212 monitors
328 and daisy chain type communication conductor 206 send battery controller 230 to.As a kind of option, instruction connects across power connection wire
The OK/NOK signal that the voltage of contact is lower than/is higher than threshold value can be transmitted to battery controller 230.Alternatively, monitor 212
The voltage difference measured can be sent to battery controller 230 to, battery controller 230 then can determine that power connection wire connects
Whether contact works normally.In addition, the signal transmitted may include identifier corresponding with the contact point being detected, so that
The contact point of degradation can be accurately positioned.
If detecting the contact point (for example, due to contact point etc. of burn into loosening) of degradation, can take appropriate
Measure.For example, battery controller 230, which can alert user (for example, driver), should check or repair battery pack.It is additional
Ground or alternatively, battery controller 230 can be detected during charge or discharge contact point resistance when sharply increasing from
Dynamic cutting battery pack, to protect battery unit/battery pack against damages.Since battery controller 230 can be identified for that degradation
The location of contact point, therefore user or technician can quickly and accurately make correction very much.For example, battery disastrously
Before degradation, the connector that the bolt of loosening can be tightened or corrode can be replaced.
Large-sized battery pack is usually made of many battery modules (battery module).It is logical between these battery modules
Letter conducting wire can very long (reaching several meters) these communication conductor both ends usually have transformer.The help of these transformers inhibits these
The external disturbance of communication conductor.Fig. 6 is the block diagram with the battery pack of multiple battery modules, refering to what is shown in Fig. 6, battery pack 600
Exemplary includes battery module M and battery module M+1 (M is positive integer), respectively with the label of label 620 and 640.Each battery mould
Block 620 or 640 may include one or more battery unit 621,622 or 641,642.Each battery unit can have monitor
624 or 644.The details of these battery units 621,622 or 641,642 and its monitor 623,624 or 643,644 is detailed
It is described in embodiment above, it is not reinflated herein.The both ends of communication conductor 626 between battery module 620 and 640 all have
Transformer is to inhibit to interfere.However transformer can not only inhibit to interfere, and can also obstruct the power connection wire 630 between battery module
On DC voltage.For this purpose, the application joined the path for capableing of conduct direct current voltage in isolation circuit.
Fig. 7 is the block diagram of the battery pack according to an embodiment of the invention with isolation circuit.Refering to what is shown in Fig. 7, for side
Just for the sake of, use label identical with Fig. 6 in figure.It includes that (M is by battery module M and battery module M+1 that battery pack 600 is exemplary
Positive integer), respectively with the label of label 620 and 640.It is appreciated that shown battery module can be the one of battery pack 600
Part.Each battery module 620 or 640 may include one or more battery unit 621,622 or 641,642.Each battery list
Member can have monitoring 623,624 or 643,644.These battery units 621,622 or 641,642 and its monitor 623,624 or
643,644 details has been described in detail in embodiment above, not reinflated herein.In the example in figure 7, with battery module
For 620 comprising the first battery unit 641 and the second battery unit 642.In each battery module, each battery unit it
Between coupled also by power connection wire.Such as in battery module 620, power connection wire 628 is by the of the first battery unit 641
One electrode (anode is shown as in figure) is coupled to the second electrode (cathode is shown as in figure) of the second battery unit 642.Each electricity
Pond module is coupled as passed through power connection wire 630 between battery module 620 and 640.
Isolation circuit is equipped between each battery module, to couple the communication conductor of adjacent battery modules.For example, battery
One end of module 620 connects the first isolation circuit 625 that is, at battery unit 622.First isolation circuit 625 includes the first transformation
Device T1, first resistor R1 and second resistance R2.The both ends of the first side of first transformer T1 are coupled to battery module 620, more
Body is the battery unit 622 of end.Between the both ends of second side that first resistor R1 and second resistance R2 are serially connected in transformer T2.
The tie point of first resistor R1 and second resistance R2 are coupled to the monitor 624 of battery unit 622.In addition, battery module 640
One end connects the second isolation circuit 627 that is, at battery unit 641.Second isolation circuit 625 may include the second transformer T1,
Three resistance R3 and the 4th resistance R4.The both ends of the first side of second transformer T2 are coupled to battery module 640, more specifically end
Battery unit 641.Second side of second transformer T2 connects second side of the first transformer T2.The electricity of 3rd resistor R3 and the 4th
Between the both ends of resistance R4 second side for being serially connected in the second transformer T2, and the tie point of 3rd resistor R3 and the 4th resistance R4 via
Voltage conductor is connected to the second electrode (being cathode in figure) of a wherein battery unit 641 for battery module 640.
It is voltage input end that monitor 624, which connects first capacitor C1, to input to difference voltage detector 312 (as schemed
3A or Fig. 3 B), instead of passing through the input of communication conductor before this.In this example, the adjacent cell of adjacent battery modules
Voltage transmitting be path by power connection wire 630, resistance R3 and R4, communication conductor 626, resistance R1, R2, voltage conductor
To transmit.Monitor 624 introduces voltage by additional pin and voltage conductor, rather than introduces electricity by communication conductor 626
Pressure, is in order to avoid the latter's bring common mode interference.Common mode interference is present in the first transformer T1 monitor 624 connected to it
In pin.The susceptibility to Communication Jamming can be improved in this connection type.
As shown in fig. 7, the first isolation circuit 625 may also include first capacitor C1, one end of first capacitor C1 is connected to
Between one resistance R1 and second resistance R2, a wherein battery unit 622 for the other end connection battery module 620 of first capacitor C1
First electrode (be in figure anode).First capacitor C1 offer voltage input end is isolated with the power end of monitor 624.
In one embodiment, the first isolation circuit 625 may also include the second capacitor C2 and third capacitor C3, the first transformer
The both ends of the first side of T1 pass through the second capacitor C2 respectively and third capacitor C3 is coupled to battery module 620, more specifically its end
The battery unit 624 in portion.Second capacitor C2 and third capacitor C3 further provides for the isolation of interference signal.
In one embodiment, the second isolation circuit 627 further includes the 4th capacitor C4 and the 5th capacitor C5, the second transformer T2
The both ends of the first side pass through the 4th capacitor C4 and the 5th capacitor C5 respectively and be coupled to battery module 640, more specifically its end
Battery unit 641.
In one embodiment, the first isolation circuit 625 can in a part physically as battery module 620, second
Isolation circuit 627 can be in a part physically as battery module 640.In another embodiment, the first isolation circuit 625
A connection component can be integrated into the second isolation circuit 627, for connecting adjacent battery module.
Embodiments described above provides various advantages.The degradation (such as corrode or loosen) of contact point can be by battery list
First monitor detects.It can be electricity by simply monitoring the voltage difference between power connection wire and corresponding communication conductor
The increase of every individual power connection wire detection contact point resistance in the group of pond.Institute's adjunct circuit in need can be by easily
It is integrated into battery unit monitor.Such detection is beneficial to improve the performance of battery pack, and the battery extended between recharging is continuous
ETS estimated time of sailing, and avoid the potential damage to battery pack.In addition, contact point detection can with other measurement (such as voltage, temperature,
Pressure etc.) it is combined, without adding external module or wiring.Furthermore embodiment can mutually isolated battery module it
Between transmit DC voltage, thus be suitable for including multiple battery modules large-sized battery pack.
It is believed that each aspect of the present invention is applicable to battery and/or battery-operated various types of equipment, is
System and device, including those of be related to automobile application equipment, system and device.Although the present invention need not be limited so, this
The various aspects of invention can be understood by using the example discussion of the context.
Although the present invention is disclosed as above with preferred embodiment, however, it is not to limit the invention, any this field skill
Art personnel, without departing from the spirit and scope of the present invention, when can make a little modification and perfect therefore of the invention protection model
It encloses to work as and subject to the definition of the claims.
Claims (10)
1. a kind of battery pack, comprising:
At least the first battery module and the second battery module, each battery module include:
At least the first battery unit and the second battery unit；
Power for coupling the first electrode of first battery unit to the second electrode of second battery unit connects
Wiring；Wherein first battery unit includes monitor；
First isolation circuit, is coupled to first battery module, and first isolation circuit includes the first transformer, the first electricity
Resistance and second resistance, the both ends of the first side of first transformer are coupled to first battery module, the first resistor
And second resistance is serially connected between the both ends of second side of the transformer, the tie point warp of the first resistor and second resistance
The monitor of a wherein battery unit for first battery module is connected to by a voltage conductor；
Second isolation circuit, is coupled to second battery module, and second isolation circuit includes the second transformer, third electricity
Resistance and the 4th resistance, the both ends of the first side of second transformer are coupled to second battery module, second transformation
Second side of device connects second side of first transformer, and the 3rd resistor and the 4th resistance are serially connected in second transformation
Between the both ends of second side of device, and the tie point of the 3rd resistor and the 4th resistance is connected to second battery module
The wherein second electrode of a battery unit；
Wherein the monitor includes:
Emitter/receiver, for carrying out signal communication via communication conductor and second battery unit；And
Be coupled to the difference voltage detector of the power connection wire and the voltage conductor, for detect the power connection wire with
Voltage difference between the communication conductor, wherein the monitor exceeds the feelings of predetermined threshold range in detected voltage difference
Indicate that the contact point of the power connection wire degrades under condition.
2. battery pack as described in claim 1, which is characterized in that first isolation circuit further includes first capacitor, described
One end of first capacitor is connected to the tie point between the first resistor and second resistance, and the other end of the first capacitor connects
Connect the first electrode of a wherein battery unit for first battery module.
3. battery pack as described in claim 1, which is characterized in that first isolation circuit further includes the second capacitor and third
Capacitor, the both ends of the first side of first transformer are capacitively coupled to described first by second capacitor and third respectively
Battery module.
4. battery pack as described in claim 1, which is characterized in that first isolation circuit further includes the 4th capacitor and the 5th
Capacitor, the both ends of the first side of second transformer pass through the 4th capacitor and the 5th respectively and are capacitively coupled to described second
Battery module.
5. battery pack as described in claim 1, which is characterized in that the difference voltage detector is configured in the transmitting
Device/receiver detects the voltage difference when just receiving signal communication via the communication conductor.
6. battery pack as described in claim 1, which is characterized in that occur via the signal communication of the communication conductor
In current field or voltage domain, and the difference voltage detector detects the DC between the power connection wire and the voltage conductor
Voltage difference.
7. battery pack as described in claim 1, which is characterized in that it includes contact spot corrosion or contact point that the contact point, which degrades,
At least one of loosen.
8. battery pack as described in claim 1, it is characterised in that:
The monitor is integrated in first battery unit, wherein the difference voltage detector is coupled to first battery
The first electrode of unit；Or
The monitor is outside first battery unit, wherein the difference voltage detector is coupled to the power connection
Line.
9. a kind of battery module, comprising:
At least the first battery unit and the second battery unit；
Power for coupling the first electrode of first battery unit to the second electrode of second battery unit connects
Wiring；Wherein first battery unit includes monitor；
Isolation circuit, the isolation circuit include transformer, first capacitor, first resistor and second resistance, the transformer
The both ends of first side are coupled to first battery unit, and second side of the transformer is adapted to another battery module, institute
Between the both ends for stating second side that first resistor and second resistance are serially connected in the transformer, the first resistor and second resistance
Tie point the monitor of first battery unit is connected to via a voltage conductor；
Wherein the monitor includes:
Emitter/receiver, for carrying out signal communication via communication conductor and second battery unit；And
Be coupled to the difference voltage detector of the power connection wire and the voltage conductor, for detect the power connection wire with
Voltage difference between the communication conductor, wherein the monitor exceeds the feelings of predetermined threshold range in detected voltage difference
Indicate that the contact point of the power connection wire degrades under condition.
10. a kind of connection component, is adapted to two adjacent battery modules of battery pack, the connection component includes:
First isolation circuit, is coupled to the first battery module, first isolation circuit include the first transformer, first resistor and
Second resistance, the both ends of the first side of first transformer are coupled to first battery module, the first resistor and
Two resistance are serially connected between the both ends of second side of the transformer, and the tie point of the first resistor and second resistance is connected to
The monitor of a wherein battery unit for first battery module；
Second isolation circuit, is coupled to the second battery module, second isolation circuit include the second transformer, 3rd resistor and
4th resistance, the both ends of the first side of second transformer are coupled to second battery module, second transformer
Second side connects second side of first transformer, and the 3rd resistor and the 4th resistance are serially connected in second transformer
Between the both ends of second side, and the tie point of the 3rd resistor and the 4th resistance is connected to second battery module wherein
The second electrode of one battery unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710479912.5A CN109119706B (en) | 2017-06-22 | 2017-06-22 | Battery pack and battery module capable of detecting contact point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710479912.5A CN109119706B (en) | 2017-06-22 | 2017-06-22 | Battery pack and battery module capable of detecting contact point |
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| CN109119706A true CN109119706A (en) | 2019-01-01 |
| CN109119706B CN109119706B (en) | 2021-03-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112014628A (en) * | 2019-05-31 | 2020-12-01 | 亚德诺半导体国际无限责任公司 | High-precision switch capacitor MOSFET current measuring technology |
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| CN109119706B (en) | 2021-03-26 |
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