CN206557354U - Battery management system - Google Patents
Battery management system Download PDFInfo
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- CN206557354U CN206557354U CN201720118592.6U CN201720118592U CN206557354U CN 206557354 U CN206557354 U CN 206557354U CN 201720118592 U CN201720118592 U CN 201720118592U CN 206557354 U CN206557354 U CN 206557354U
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- battery management
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Abstract
The utility model provides a kind of battery management system, including collecting unit, amplifier unit and control unit；Collecting unit is exported to amplifier unit for gathering the current signal of electrokinetic cell, and being translated into voltage signal；Amplifier unit is connected between collecting unit and control unit, for receiving the voltage signal of collecting unit output and exporting to control unit after being amplified to voltage signal；Control unit is used to receive the voltage signal amplified through amplifier unit, and judges whether collecting unit contacts well with amplifier unit according to the voltage signal received；When battery management system is in running order, if the voltage signal that control unit is received is equal to the first preset value, judge that collecting unit is contacted well with amplifier unit；If the voltage signal that control unit is received is equal to the second preset value, collecting unit and amplifier unit loose contact are judged.The battery management system maintenance efficiency that the utility model is provided is high, while reducing human cost.
Description
【Technical field】
The utility model relates to electric vehicle engineering field, more particularly to a kind of battery management system.
【Background technology】
When electric automobile works, battery management system needs to adopt the charging and discharging currents of the electrokinetic cell of electric automobile
Collection.At present, mostly current signal is acquired by current diverter or Hall current sensor, will then collected again
Current signal by given after signal condition MCU (Micro Control Unit, central processing unit) processing.
Because Hall current sensor has obvious advantage in performance, battery management system is all adopted mostly at present
Current signal collection is carried out with Hall current sensor.It will be reported when current sampling circuit can not collect normal current signal
Mistake, and then cause electric automobile cisco unity malfunction.However, having a variety of due to causing current sample abnormal, it is difficult to soon
Where speed finds problem, while need to tear open car investigation problem, and then cause that workload is larger, human cost is high and less efficient.
In consideration of it, real be necessary to provide a kind of new battery management system to overcome drawbacks described above.
【Utility model content】
The purpose of this utility model is to provide a kind of battery management system, and the battery management system maintenance efficiency is high, drop
Low human cost.
To achieve these goals, the utility model provides a kind of battery management system, and it is applied in electric automobile, institute
Stating electric automobile includes electrokinetic cell；The battery management system includes collecting unit, amplifier unit and control unit；It is described
Collecting unit is used for the current signal for gathering the electrokinetic cell, and the current signal collected is converted into voltage signal output
To the amplifier unit；The amplifier unit is connected between the collecting unit and described control unit, the amplifier unit
Export single to the control for receiving the voltage signal of collecting unit output, and after being amplified to the voltage signal
Member；Described control unit is used to receive the voltage signal amplified through the amplifier unit, and according to the electricity received
Pressure signal judges whether the collecting unit contacts well with the amplifier unit；When the battery management system is in work shape
During state, if the voltage signal that described control unit is received is equal to the first preset value, the collecting unit and institute are judged
State the contact of amplifier unit good；If the voltage signal that described control unit is received is equal to the second preset value, institute is judged
State collecting unit and the amplifier unit loose contact.
In a preferred embodiment, first preset value is more than second preset value.
In a preferred embodiment, preset if the voltage signal that described control unit is received is more than first
Value, then judge that the electrokinetic cell is in charged state；If the voltage signal that described control unit is received is less than first
Preset value, then judge that the electrokinetic cell is in discharge condition.
In a preferred embodiment, the amplifier unit includes operational amplifier, first resistor, second resistance, the
Three resistance, the 4th resistance, the 5th resistance and the 6th resistance；One end of the first resistor is connected with the first power supply, and described
The other end of first resistor passes sequentially through the second resistance, the 3rd resistor and the 4th resistance and second source phase
Even；The collecting unit includes lead-out terminal, and the input terminal is connected between the second resistance and the 3rd resistor；
The input in the same direction of the operational amplifier is connected between the first resistor and the second resistance；The operational amplifier
Reverse input end pass through the 5th resistance eutral grounding；The output end of the operational amplifier is connected with described control unit；Institute
The one end for stating the 6th resistance is connected with the reverse input end of the operational amplifier, and the other end of the 6th resistance with it is described
The output end of operational amplifier is connected；The voltage of the first power supply output is more than the second voltage that the second source is exported.
In a preferred embodiment, the amplifier unit also includes the first electric capacity；One end of first electric capacity with
First power supply is connected, and the other end of first electric capacity is connected with the in-phase input end of the operational amplifier.
In a preferred embodiment, the amplifier unit also includes the second electric capacity；One end of second electric capacity with
The reverse input end of the operational amplifier is connected, and the output end of the other end and the operational amplifier of second electric capacity
It is connected.
In a preferred embodiment, the battery management system also bag filter unit；The filter unit be used for pair
The voltage signal after the amplifier unit amplification is filtered rear and exported to described control unit.
In a preferred embodiment, the filter unit includes the 7th resistance and the 3rd electric capacity；7th electricity
One end of resistance is connected with the amplifier unit, and the other end of the 7th resistance passes through the 3rd capacity earth.
In a preferred embodiment, the battery management system also includes clamping unit；The clamping unit connection
Between the amplifier unit and described control unit；The clamping unit is used for the institute after amplifier unit amplification
Voltage signal is stated to be clamped in preset range and export to described control unit.
In a preferred embodiment, the clamping unit includes the first diode and the second diode；Described
The negative electrode of the plus earth of one diode and first diode is connected with second diode anode；Two or two pole
The negative electrode of pipe is connected with tertiary voltage source；The anode of the negative electrode of first diode and second diode also respectively with institute
Amplifier unit is stated to be connected.
The battery management system that the utility model is provided, the voltage that described control unit can be received according to it judges institute
State whether collecting unit contacts well with the amplifier unit, can be where quick positioning question, without tearing car investigation, Jin Erti open
High maintenance efficiency and reduce human cost.
【Brief description of the drawings】
The functional block diagram for the battery management system that Fig. 1 provides for the utility model.
The circuit theory diagrams for the battery management system that Fig. 2 provides for the utility model.
【Embodiment】
In order that the purpose of this utility model, technical scheme and advantageous effects become apparent from understanding, below in conjunction with attached
Figure and embodiment, the utility model is further elaborated.It should be appreciated that described in this specification
Embodiment is not intended to limit the utility model just for the sake of explaining the utility model.
Referring to Fig. 1, the functional block diagram of its battery management system 100 provided for the utility model.The cell tube
Reason system 100 is applied in electric automobile, and the electric automobile includes providing the electrokinetic cell (not shown) of power for it.Enter one
Step ground, the battery management system 100 includes collecting unit 10, amplifier unit 20, filter unit 30, clamping unit 40 and control
Unit 50 processed.
The collecting unit 10 is used to be acquired the charging and discharging currents of the electrokinetic cell, and by the electric current collected
Signal is converted into voltage signal and exported to the amplifier unit 20.In the present embodiment, the collecting unit 10 is Hall electricity
Flow sensor.
The amplifier unit 20 is connected between the collecting unit 10 and the filter unit 30.The amplifier unit 20
Exported for receiving the voltage signal that the collecting unit 10 is exported, and after being amplified to the voltage signal.
The filter unit 30 is used to receive the voltage signal that the amplifier unit 20 is exported, and the voltage signal is entered
Exported after row filtering to the clamping unit 40.
The clamping unit 40 is connected between the filter unit 30 and described control unit 50.The clamping unit 40
Exported for the filtered voltage signal to be clamped in preset range to described control unit 50.In present embodiment
In, the preset range is 0V~3.3V.Because the voltage signal after after filtering is clamped to by the clamping unit 40
Between 0V~3.3V, so cause no matter the magnitude of voltage that the amplifier unit 20 is exported why, will not be by described control unit
50 damage.
Described control unit 50 is used to receive the voltage signal Jing Guo clamper, and sentences according to the voltage signal received
Whether the collecting unit 10 that breaks contacts well with the amplifier unit 20.Specifically, when the battery management system 100 is in
During working condition, if the voltage signal for the process clamper that described control unit 50 is received is equal to the first preset value, sentence
The collecting unit 10 that breaks is contacted well with the amplifier unit 20.If the institute for the process clamper that described control unit 50 is received
Voltage signal is stated equal to the second preset value, then judges the collecting unit 10 and the loose contact of amplifier unit 20.For example, institute
Stating collecting unit (Hall current sensor) 10 may contact because of reasons such as vibrations, oxidation and corrosion with the distant place unit 20
It is bad.In the present embodiment, first preset value is more than second preset value.It is appreciated that in the first preset value or
Voltage signal described in person in the positive and negative 0.1V of the second preset value error range, may determine that for first preset value or
The second preset value is equal described in person.In the present embodiment, described control unit is MCU (Micro Control Unit, micro-control
Unit processed).
Further, preset if the voltage signal for the process clamper that described control unit 50 is received is more than first
Value, then judge that the electrokinetic cell is in charged state.If the voltage for the process clamper that described control unit 50 is received
Signal is less than the first preset value, then judges that the electrokinetic cell is in discharge condition.Therefore, the electricity of offer described in the utility model
Pond management system 100 can also collect the charge and discharge that the current signal judges the electrokinetic cell according to the collecting unit 10
Electricity condition.
In addition, before being come into operation after the battery management system 100 production, if the warp that described control unit 50 is received
The voltage signal for crossing clamper is equal to the second preset value, then judges the amplifier unit 20, filter unit 30 and the pincers
Bit location 40 is in normal condition.It is to be appreciated that it is described when the battery management system 100 production after come into operation before simultaneously
It is not connected with the collecting unit 10.Therefore, the battery management system 100 of offer described in the utility model produce electricity when without
The amplifier unit 20, filter unit 30 and the clamper can be tested by needing to put into substantial amounts of tooling device and human cost
Whether unit 50 is normal.
Referring again to Fig. 2, it is the circuit theory diagrams of battery management system 100 provided by the utility model.The fortune
Putting unit 20 includes operational amplifier U1, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance
R5 and the 6th resistance R6.One end of the first resistor R1 is connected with the first power supply VCC1, and the first resistor R1's is another
One end passes sequentially through the second resistance R2, the 3rd resistor R3 and the 4th resistance R4 and second source VCC2 phases
Connect, that is, the first resistor R1, the second resistance R2, the 3rd resistor R3 and the 4th resistance R4 are series at
Between the first power supply VCC1 and the second source VCC2.The collecting unit 10 includes lead-out terminal 11, the input
Terminal 11 is connected between the second resistance R2 and the 3rd resistor R3.The input in the same direction of the operational amplifier U1 connects
It is connected between the first resistor R1 and the second resistance R2；The reverse input end of the operational amplifier U1 passes through described
Five resistance eutral groundings；The output end of the operational amplifier U1 is connected with the filter unit.One end of the 6th resistance R6 with
The reverse input end of the operational amplifier U1 is connected, and the other end of the 6th resistance R6 is with the operational amplifier U1's
Output end is connected.In the present embodiment, the resistance of the first resistor R1 is equal to the 4th resistance R4 resistance；Second electricity
The resistance for hindering R2 is equal to the resistance of the 3rd resistor R3.The resistance of the 5th resistance R5 is more than the resistance of the 6th resistance R6
Value.The first voltage of the first power supply VCC1 outputs is more than the second voltage that the second source VCC2 is exported.Specifically, institute
First voltage is stated for 1.65V, the second voltage is -15V.
Further, the amplifier unit 20 also includes the first electric capacity C1.One end of the first electric capacity C1 and described the
One power supply VCC1 is connected, and the other end of the first electric capacity C1 is connected with the in-phase input end of the operational amplifier U1.
Further, the amplifier unit 20 also includes the second electric capacity C2.One end of the second electric capacity C2 and the fortune
The reverse input end for calculating amplifier U1 is connected, and the output end of the other end and the operational amplifier U1 of the second electric capacity C2
It is connected.
The filter unit 30 includes the 7th resistance R7 and the 3rd electric capacity C3.One end of the 7th resistance R7 with it is described
Operational amplifier U1 output end is connected, and the other end of the 7th resistance R7 is grounded by the 3rd electric capacity C3.
The clamping unit 40 includes the first diode D1 and the second diode D2.The anode of the first diode D1
It is grounded and the negative electrode of the first diode D1 is connected with the second diode D2 anodes.The negative electrode of the second diode D2
It is connected with tertiary voltage source VCC3.The output end of the operational amplifier U1 is also connected to described by the 7th resistance R7
Between one diode D1 negative electrode and the second diode D2 anode.In the present embodiment, the 3rd power supply VCC3
For exporting tertiary voltage, the tertiary voltage is 3.3V.
Described control unit 50 includes input terminal 51.The input terminal 51 is connected to the moon of the first diode D1
Between pole and the second diode D2 anode.
The operation principle of the battery management system 100 is as follows：
When the collecting unit 10 and 20 loose contact of amplifier unit, the output end institute of the operational amplifier U1
The voltage Uo of output calculation is as follows：
The first power supply VCC1 is considered as ground connection first, now, the electricity of the output end output of the operational amplifier U1
Press U1=[VCC2*R1/ (R1+R2+R3+R4)] * (1+R6/R5)；Then the second source VCC2 is considered as ground connection, now,
Voltage U2=[VCC1-VCC1*R1/ (R1+R2+R3+R4)] * (1+R6/R5) of the output end output of the operational amplifier U1.
Uo1=U1+U2 can be drawn by superposition theorem, due to the first resistor R1~the 6th resistance R6 value, it is known that because
This, Uo1 now is the second preset value.
When the collecting unit 10 contacts good with the amplifier unit 20, the output end of the operational amplifier U1 is defeated
The voltage Uo gone out calculation is as follows：
The lead-out terminal 11 of the collecting unit 10 is considered as ground connection first, now, the output of the operational amplifier U1
Hold voltage U3=VCC1*R2/ (R1+R2) * (1+R6/R5) of output；Then the first power supply VCC1 is considered as ground connection, now, institute
State voltage U4=Ui*R1/ (R1+R2) * (1+R6/R5) of operational amplifier U1 output end output.It can be obtained by superposition theorem
Go out Uo2=U3+U4, because the first resistor R1~the 6th resistance R6 value is, it is known that therefore, Uo2 now is
First preset value.Further, when the electrokinetic cell is in charged state, the collecting unit 10 exports positive voltage；When
When the electrokinetic cell is in discharge condition, the collecting unit 10 exports negative voltage.
The battery management system 100 that the utility model is provided, the voltage that described control unit 50 can be received according to it
Judge whether the collecting unit 10 contacts well with the amplifier unit 20, can be where quick positioning question, without tearing car open
Investigation, and then improve maintenance efficiency and reduce human cost.
The utility model is not restricted to described in specification and embodiment, therefore for the personnel of familiar field
For additional advantage and modification is easily achieved, therefore in the universal limited without departing substantially from claim and equivalency range
Spirit and scope in the case of, the utility model is not limited to specific details, representational equipment and shown here as with retouching
The examples shown stated.
Claims (10)
1. a kind of battery management system, it is applied in electric automobile, and the electric automobile includes electrokinetic cell；Its feature exists
In：The battery management system includes collecting unit, amplifier unit and control unit；The collecting unit is used to gather described
The current signal of electrokinetic cell, and the current signal collected is converted into voltage signal exported to the amplifier unit；It is described
Amplifier unit is connected between the collecting unit and described control unit, and the amplifier unit is used to receive the collecting unit
The voltage signal of output, and export to described control unit after being amplified to the voltage signal；Described control unit is used for
The voltage signal amplified through the amplifier unit is received, and judges that the collection is single according to the voltage signal received
It is first whether to be contacted well with the amplifier unit；When the battery management system is in running order, if described control unit
The voltage signal received is equal to the first preset value, then judges that the collecting unit is contacted well with the amplifier unit；
If the voltage signal that described control unit is received is equal to the second preset value, the collecting unit and the amplifier are judged
Unit loose contact.
2. battery management system as claimed in claim 1, it is characterised in that：First preset value, which is more than described second, to be preset
Value.
3. battery management system as claimed in claim 1, it is characterised in that：If the voltage that described control unit is received
Signal is more than the first preset value, then judges that the electrokinetic cell is in charged state；If it is described that described control unit is received
Voltage signal is less than the first preset value, then judges that the electrokinetic cell is in discharge condition.
4. battery management system as claimed in claim 1, it is characterised in that：The amplifier unit includes operational amplifier, the
One resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance；One end of the first resistor and the
One power supply is connected, and the other end of the first resistor passes sequentially through the second resistance, the 3rd resistor and described the
Four resistance are connected with second source；The collecting unit includes lead-out terminal, and the lead-out terminal is connected to the second resistance
Between the 3rd resistor；The input in the same direction of the operational amplifier is connected to the first resistor and the second resistance
Between；The reverse input end of the operational amplifier passes through the 5th resistance eutral grounding；The output end of the operational amplifier with
Described control unit is connected；One end of 6th resistance is connected with the reverse input end of the operational amplifier, and described
The other end of six resistance is connected with the output end of the operational amplifier；The voltage of the first power supply output is more than described second
The second voltage of power supply output.
5. battery management system as claimed in claim 4, it is characterised in that：The amplifier unit also includes the first electric capacity；Institute
The one end for stating the first electric capacity is connected with first power supply, and the other end and the operational amplifier of first electric capacity is same
Phase input is connected.
6. battery management system as claimed in claim 4, it is characterised in that：The amplifier unit also includes the second electric capacity；Institute
The one end for stating the second electric capacity is connected with the reverse input end of the operational amplifier, and the other end of second electric capacity with it is described
The output end of operational amplifier is connected.
7. battery management system as claimed in claim 1, it is characterised in that：The battery management system also bag filter unit；
The filter unit is used for after the voltage signal after amplifying to the amplifier unit is filtered and exported to the control
Unit.
8. battery management system as claimed in claim 7, it is characterised in that：The filter unit includes the 7th resistance and the
Three electric capacity；One end of 7th resistance is connected with the amplifier unit, and the other end of the 7th resistance passes through described
Three capacity earths.
9. battery management system as claimed in claim 1, it is characterised in that：The battery management system also includes clamper list
Member；The clamping unit is connected between the amplifier unit and described control unit；The clamping unit is used to that institute will to be passed through
The voltage signal after the amplification of amplifier unit is stated to be clamped in preset range and export to described control unit.
10. battery management system as claimed in claim 9, it is characterised in that：The clamping unit include the first diode with
And second diode；The negative electrode of the plus earth of first diode and first diode and second diode sun
Extremely it is connected；The negative electrode of second diode is connected with tertiary voltage source；The negative electrode of first diode and the described 2nd 2
The anode of pole pipe is also connected with the amplifier unit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720118592.6U CN206557354U (en) | 2017-02-08 | 2017-02-08 | Battery management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720118592.6U CN206557354U (en) | 2017-02-08 | 2017-02-08 | Battery management system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206557354U true CN206557354U (en) | 2017-10-13 |
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ID=60011049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720118592.6U Active CN206557354U (en) | 2017-02-08 | 2017-02-08 | Battery management system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206557354U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842052A (en) * | 2017-02-08 | 2017-06-13 | 深圳市沃特玛电池有限公司 | Battery management system |
-
2017
- 2017-02-08 CN CN201720118592.6U patent/CN206557354U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842052A (en) * | 2017-02-08 | 2017-06-13 | 深圳市沃特玛电池有限公司 | Battery management system |
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