CN108562857A - A kind of battery pack heavy-current discharge circuit for detecting - Google Patents
A kind of battery pack heavy-current discharge circuit for detecting Download PDFInfo
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- CN108562857A CN108562857A CN201810277329.0A CN201810277329A CN108562857A CN 108562857 A CN108562857 A CN 108562857A CN 201810277329 A CN201810277329 A CN 201810277329A CN 108562857 A CN108562857 A CN 108562857A
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- sampling
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- 238000005070 sampling Methods 0.000 claims abstract description 77
- 230000005611 electricity Effects 0.000 claims description 15
- 230000003321 amplification Effects 0.000 claims description 8
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 8
- 230000008094 contradictory effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 102220007331 rs111033633 Human genes 0.000 description 1
- 102220012898 rs397516346 Human genes 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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- Tests Of Electric Status Of Batteries (AREA)
Abstract
The present invention provides a kind of battery pack heavy-current discharge circuit for detecting, including sampling resistor circuit, voltage differential amplifying circuit and microcontroller；Sampling resistor circuit is formed in parallel by several sampling resistors；Sampling resistor circuit is connected to anode and/or battery cathode；Sampling resistor circuit is connect by voltage differential amplifying circuit with microcontroller.Battery pack provided by the invention is large current discharge circuit for detecting, solves the problems, such as that high current down-sampling resistance consumption power is excessive by sampling resistor circuit made of several resistor coupled in parallel；Amplify sampled signal by voltage differential amplifying circuit, avoid sampling resistor circuit total resistance value reduce caused by microcontroller the problem of can not detecting sampled signal.Battery pack provided in an embodiment of the present invention is large current discharge circuit for detecting, it is simple and practical in structure, the sampling precision that ensure that microcontroller while reducing sampling consumption power, solves the problems, such as the contradiction for having between sampling consumption work(and sampling precision in existing sample circuit.
Description
Technical field
The present invention relates to battery power discharges to detect field, more particularly to a kind of battery pack is large current discharge circuit for detecting.
Background technology
Battery pack is a kind of battery pack for supporting heavy-current discharge, such as：The lithium ion power storage battery of 100AH, it is specified
Discharge current 100A.This kind of battery pack is required to carry out sampling monitoring, and existing sample circuit is as shown in Figure 1 and Figure 2.Above-mentioned electricity
Road has the following problems, on the one hand, larger sampled voltage or electric current is easy to be identified by microcontroller, but sampled voltage or electric current
Greatly, it will cause the problem that power consumption is big, the serious waste electricity of battery pack.With the lithium-ion-power cell group of 100AH
For, if sampling resistor 3m Ω, consumption power=I*I*R=100*100*0.003=30W of sampling resistor,
So big consumption power is a kind of unacceptable electricity waste.
On the other hand, when sampled voltage or smaller electric current, too small voltage or electric current convert accurately the A/D of microcontroller
It has been larger challenge for property；Such as with the 5V microcontrollers of 12 common A/D come when detecting, minimum input analog quantity=
5V/4096=0.00122V then to (0.003V/0.00122V should be had in such as sampling theory of 0.003V small voltages
=2.45) scale of a analog-converted number, but due to the error of microcontroller inherently 2-3 scale, so it is difficult to really
The validity of so small sampled voltage is protected, microcontroller cannot accurately identify sampled signal；I.e. existing sample circuit
The middle contradictory problems existed between consumption power and sampling precision.
Invention content
To solve to exist between consumption power and sampling precision in the existing sample circuit mentioned in above-mentioned background technology
The problem of contradiction, the present invention provide a kind of battery pack heavy-current discharge circuit for detecting, including sampling resistor circuit, voltage differential are put
Big circuit and microcontroller U1；Wherein：
The sampling resistor circuit is formed in parallel by several sampling resistors；
The sampling resistor circuit is connected to anode and/or battery cathode；
The voltage differential amplifying circuit include capacitance C1, resistance R11, resistance R12, resistance R13, operational amplifier IC1,
Resistance R14, resistance R15 and capacitance C2；
The capacitance C1 and the sampling resistor circuit in parallel；The one end the capacitance C1 passes sequentially through resistance R11 and resistance
R12 is grounded；The resistance R11 is connect with the connecting node of resistance R12 with the in-phase input end of operational amplifier IC1；The electricity
Hold the C1 other ends to connect with the one end resistance R13；The inverting input and electricity of the resistance R13 other ends and operational amplifier IC1
Hinder the connection of the one end R14；Output end, the resistance R14 other ends of the operational amplifier IC1 is connect with the one end resistance R15；It is described
The resistance R15 other ends are connect with microcontroller U1；The connecting node of the resistance R15 and microcontroller U1 is grounded by capacitance C2.
Further, the Chip-R of the model 1W/5m Ω of the sampling resistor.
Further, the sampling resistor is equipped with 10.
Further, the amplification factor of the voltage differential amplifying circuit 20 is 100 times.
Further, the model of the resistance R12 and resistance R14 is 470K ± 0.5%；The resistance R11 and resistance
Equal 4.7K ± 0.5% of model of R13.
Further, the capacitance of the capacitance C1 is 104K；The capacitance of the capacitance C2 is 102K；The resistance R15's
Resistance value is 1K Ω.
Further, the model LM324 of the operational amplifier IC1.
Further, the positive power source terminal connection+5V power supplys of the operational amplifier IC1.
Battery pack provided by the invention is large current discharge circuit for detecting, passes through sampling resistor electricity made of several resistor coupled in parallel
Road solves the problems, such as that high current down-sampling resistance consumption power is excessive；Amplify sampled signal by voltage differential amplifying circuit,
Avoid sampling resistor circuit total resistance value reduce caused by microcontroller the problem of can not detecting sampled signal.The present invention is implemented
The battery pack that example provides is large current discharge circuit for detecting, simple and practical in structure, ensure that while reducing sampling consumption power
The sampling precision of microcontroller solves and there is contradictory asking between sampling consumption power and sampling precision in existing sample circuit
Topic.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments for those of ordinary skill in the art without having to pay creative labor, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the sample circuit that existing sampling resistor is set to low level；
Fig. 2 is that existing sampling resistor is set to high-order sample circuit；
Fig. 3 is that battery pack provided by the invention is large current discharge one embodiment circuit diagram of circuit for detecting；
Fig. 4 is that battery pack provided by the invention is large current discharge another embodiment circuit diagram of circuit for detecting.
Reference numeral：
10 sampling resistor circuit, 20 voltage differential amplifying circuit
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the similar word such as term " connection " or " connected " is simultaneously non-limiting
But may include electrical connection, light connects etc. with the connection of physics or machinery, either directly or indirectly.
The embodiment of the present invention provides a kind of battery pack heavy-current discharge circuit for detecting, it is characterised in that：Including sampling resistor
Circuit 10, voltage differential amplifying circuit 20 and microcontroller U1；Wherein：
The sampling resistor circuit 10 is formed in parallel by several sampling resistors；
The sampling resistor circuit 10 is connected to anode and/or battery cathode；
The voltage differential amplifying circuit 20 includes capacitance C1, resistance R11, resistance R12, resistance R13, operational amplifier
IC1, resistance R14, resistance R15 and capacitance C2；
The capacitance C1 is in parallel with the sampling resistor circuit 10；The one end the capacitance C1 passes sequentially through resistance R11 and electricity
Hinder R12 ground connection；The resistance R11 is connect with the connecting node of resistance R12 with the in-phase input end of operational amplifier IC1；It is described
The capacitance C1 other ends are connect with the one end resistance R13；The inverting input of the resistance R13 other ends and operational amplifier IC1 and
The one end resistance R14 connects；Output end, the resistance R14 other ends of the operational amplifier IC1 is connect with the one end resistance R15；Institute
The resistance R15 other ends are stated to connect with microcontroller U1；The connecting node of the resistance R15 and microcontroller U1 is grounded by capacitance C2.
When it is implemented, as shown in Figure 3, Figure 4, sampling resistor circuit 10 by include but not limited to 10 sampling resistors simultaneously
Join；Sampling resistor circuit 10 is connected to anode and/or battery cathode；When sampling resistor circuit 10 is placed in low level
(as shown in Figure 3), 10 both ends of sampling resistor circuit are separately connected battery cathode and fuse；Fuse passes sequentially through electronic cutting
It closes, load is connect with anode.When sampling resistor circuit 10 is placed in a high position (as shown in Figure 4), 10 liang of sampling resistor circuit
End is connect with anode and fuse respectively；Fuse passes sequentially through electronic switch, load and battery cathode and connects；Peripheral electricity
Road is connected in load.
Voltage differential amplifying circuit 20 includes capacitance C1, resistance R11, resistance R12, resistance R13, operational amplifier IC1, electricity
Hinder R14, resistance R15 and capacitance C2；
Capacitance C1 is in parallel with sampling resistor circuit 10, sampling resistor be respectively resistance R1, resistance R2, resistance R3, resistance R4,
Resistance R5, resistance R6, resistance R7, resistance R8, resistance R9 and resistance R10；The one end capacitance C1 passes sequentially through resistance R11 and resistance
R12 is grounded；Resistance R11 is connect with the connecting node of resistance R12 with the in-phase input end of operational amplifier IC1；Capacitance C1 is another
End is connect with the one end resistance R13；The resistance R13 other ends connect with the inverting input of operational amplifier IC1 and the one end resistance R14
It connects；Output end, the resistance R14 other ends of operational amplifier IC1 is connect with the one end resistance R15；The resistance R15 other ends and monolithic
Machine U1 connections；The connecting node of resistance R15 and microcontroller U1 is grounded by capacitance C2.The positive power source terminal of operational amplifier IC1 connects
Connect+5V power supplys；The negative power end of operational amplifier IC1 is grounded；I.e. sampling resistor circuit passes through voltage differential amplifying circuit and list
The U1 connections of piece machine.
By include but not limited to 10 1W/5m Ω the sampling resistor circuit 10 that is formed in parallel of sampling resistor, it is in parallel
Resistance=5m Ω/10=0.5m Ω；Consume power=I*I*R=100A*100A*0.0005 Ω=5W；An average resistance disappears
Wasted work rate=5W/10=0.5W, each resistance select the Chip-R of 1W rated power to facilitate processing；It is reduced and is sampled by parallel connection
The total resistance value of resistance, to reduce the consumption power mistake of sampling resistor；Meanwhile it also avoiding since the consumption power of sampling resistor is excessive
Caused by huge problem of temperature rise, avoid the problem that change in resistance caused by high temperature make current sample error greatly even fail.
The voltage differential amplifying circuit 20 provided through the invention amplifies sampled signal, and voltage differential amplifying circuit 20 is put
Big multiple=R12/R11=R14/R13=470K/4.7K=100；Uout=100* (U1-U2)；In order to ensure differential amplification electricity
Road is operated in the linear area of amplification, is paid particular attention to using differential amplifier circuit：Differential amplification output voltage must be smaller than transporting
The supply voltage of amplifier is calculated, while being ensured that the input less than microcontroller allows voltage.Such as the sampling resistor band of 0.5m Ω
Sampled voltage=the I*R=1A*0.0005=0.0005V come, sampled voltage=0.0005*100=after 100 times of amplification
0.05V, with the 5V microcontrollers of general 12 A/D come when detecting, then the sampled voltage of 0.05V theoretically should just have
The scale of (0.05V/0.00122V=41) a analog-converted number, this is just substantially improved, and sampled input voltage is too low to be detectd
The problem of survey.
Battery pack provided in an embodiment of the present invention is large current discharge circuit for detecting, by being sampled made of several resistor coupled in parallel
Resistance circuit solves the problems, such as that high current down-sampling resistance consumption power is excessive；Amplified by voltage differential amplifying circuit and is sampled
Signal, avoid sampling resistor circuit total resistance value reduce caused by microcontroller the problem of can not detecting sampled signal.This hair
The battery pack that bright embodiment provides is large current discharge circuit for detecting, simple and practical in structure, while reducing sampling consumption power
The sampling precision that ensure that microcontroller solves the lance existed in existing sample circuit between sampling consumption power and sampling precision
The problem of shield.
Also, general sampling resistor is placed on low level, as shown in Figure 1, sampling resistor is disposed in proximity to battery cathode
Easily there is the electric current loaded not exclusively by sampling resistor to GND in one end (ends GND), this circuit, but by load and outside
Enclose the problem of circuit forms current loop, electric current is caused not sample.To solve the problems, such as this, occur in the market such as Fig. 2 institutes
Sampling resistor is placed on close to one end of anode, this circuit structure, is more than monolithic in the voltage of battery by the circuit shown
It can not just be used when the supply voltage 5V or more of machine, cause microcontroller that can not accurately read the sampled signal of input, or even can be because
Microcontroller is burnt out for input voltage is excessively high.Battery pack heavy-current discharge circuit for detecting provided by the invention can not only be connected to
Battery cathode, moreover it is possible to be connected to anode normal work, avoid above-mentioned since load and peripheral circuit form current loop
And cause that electric current can not acquire or sampling resistor is placed in that sampled signal caused by anode can not acquire or microcontroller is burnt
Problem.
Preferably, the Chip-R of the model 1W/5m Ω of the sampling resistor.Resistance R1, resistance R2, resistance R3, electricity
The model for hindering R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9 and resistance R10 is the Chip-R of 1W/5m Ω；
The Chip-R of 1W/5m Ω can facilitate industrial production, and sampling resistor is excessive or the too small production for being unfavorable for circuit board.Certainly,
Sampling resistor of the present invention is not limited to the Chip-R of above-mentioned 1W/5m Ω, further includes that other are functionally the same or similar
Resistance；The preferred embodiment that the Chip-R of 1W/5m Ω of the present invention only proposes for convenience of industrial production.
Preferably, the sampling resistor is equipped with 10.
Preferably, the amplification factor of the voltage differential amplifying circuit 20 is 100 times.
Preferably, the model of the resistance R12 and resistance R14 is 470K ± 0.5%；The resistance R11 and resistance R13
Equal 4.7K ± 0.5% of model.
Preferably, the capacitance of the capacitance C1 is 104K；The capacitance of the capacitance C2 is 102K；The resistance of the resistance R15
Value is 1K Ω.
Preferably, the model LM324 of the operational amplifier IC1.
Preferably, the positive power source terminal connection+5V power supplys of the operational amplifier IC1.
Although more herein used such as anode, battery cathode, load, electronic switch, fuse, electricity
The terms such as resistance, capacitance, operational amplifier, microcontroller, but it does not preclude the possibility of using other terms.Only using these terms
Merely to more easily describing and explaining the essence of the present invention；Being construed as any one of the additional limitations all is and this
What spirit was disagreed.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (8)
1. a kind of battery pack is large current discharge circuit for detecting, it is characterised in that：It is put including sampling resistor circuit (10), voltage differential
Big circuit (20) and microcontroller U1；Wherein：
The sampling resistor circuit (10) is formed in parallel by several sampling resistors；
The sampling resistor circuit (10) is connected to anode and/or battery cathode；
The voltage differential amplifying circuit (20) include capacitance C1, resistance R11, resistance R12, resistance R13, operational amplifier IC1,
Resistance R14, resistance R15 and capacitance C2；
The capacitance C1 is in parallel with sampling resistor circuit (10)；The one end the capacitance C1 passes sequentially through resistance R11 and resistance
R12 is grounded；The resistance R11 is connect with the connecting node of resistance R12 with the in-phase input end of operational amplifier IC1；The electricity
Hold the C1 other ends to connect with the one end resistance R13；The inverting input and electricity of the resistance R13 other ends and operational amplifier IC1
Hinder the connection of the one end R14；Output end, the resistance R14 other ends of the operational amplifier IC1 is connect with the one end resistance R15；It is described
The resistance R15 other ends are connect with microcontroller U1；The connecting node of the resistance R15 and microcontroller U1 is grounded by capacitance C2.
2. battery pack according to claim 1 is large current discharge circuit for detecting, it is characterised in that：The type of the sampling resistor
Number be 1W/5m Ω Chip-R.
3. battery pack according to claim 1 is large current discharge circuit for detecting, it is characterised in that：The sampling resistor is equipped with
10.
4. battery pack according to claim 1 is large current discharge circuit for detecting, it is characterised in that：The voltage differential amplification
The amplification factor of circuit (20) is 100 times.
5. battery pack according to claim 4 is large current discharge circuit for detecting, it is characterised in that：The resistance R12 and electricity
The model for hindering R14 is 470K ± 0.5%；Equal 4.7K ± 0.5% of model of the resistance R11 and resistance R13.
6. battery pack according to claim 4 is large current discharge circuit for detecting, it is characterised in that：The capacitance of the capacitance C1
For 104K；The capacitance of the capacitance C2 is 102K；The resistance value of the resistance R15 is 1K Ω.
7. battery pack according to claim 1 is large current discharge circuit for detecting, it is characterised in that：The operational amplifier
The model LM324 of IC1.
8. being large current discharge circuit for detecting according to claim 1-7 any one of them battery packs, it is characterised in that：The operation
Positive power source terminal connection+5V the power supplys of amplifier IC1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810277329.0A CN108562857A (en) | 2018-03-31 | 2018-03-31 | A kind of battery pack heavy-current discharge circuit for detecting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810277329.0A CN108562857A (en) | 2018-03-31 | 2018-03-31 | A kind of battery pack heavy-current discharge circuit for detecting |
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| Publication Number | Publication Date |
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| CN108562857A true CN108562857A (en) | 2018-09-21 |
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ID=63533710
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|---|---|---|---|
| CN201810277329.0A Pending CN108562857A (en) | 2018-03-31 | 2018-03-31 | A kind of battery pack heavy-current discharge circuit for detecting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112180269A (en) * | 2020-10-14 | 2021-01-05 | 普联技术有限公司 | Battery pack access identification method and system |
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| CN207924112U (en) * | 2018-03-31 | 2018-09-28 | 厦门芯阳科技股份有限公司 | A kind of battery pack heavy-current discharge circuit for detecting |
-
2018
- 2018-03-31 CN CN201810277329.0A patent/CN108562857A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016206048A1 (en) * | 2015-06-25 | 2016-12-29 | Abb 瑞士股份有限公司 | Single live wire electrical switch and method of detecting and controlling load property |
| CN106324332A (en) * | 2015-07-06 | 2017-01-11 | 深圳市沃特玛电池有限公司 | Current sampling circuit of battery management system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112180269A (en) * | 2020-10-14 | 2021-01-05 | 普联技术有限公司 | Battery pack access identification method and system |
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Application publication date: 20180921 |