CN207039230U - A kind of current detection circuit - Google Patents
A kind of current detection circuit Download PDFInfo
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- CN207039230U CN207039230U CN201720730641.1U CN201720730641U CN207039230U CN 207039230 U CN207039230 U CN 207039230U CN 201720730641 U CN201720730641 U CN 201720730641U CN 207039230 U CN207039230 U CN 207039230U
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- switch module
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- 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
The utility model is applied to field of battery management, there is provided a kind of current detection circuit, applied to battery management system, the system includes battery pack；It is characterised by, the circuit includes：First switch module, second switch module, sampling resistor；Control module, for controlling the first switch module, second switch module break-make, and the voltage on the sampling resistor is detected, to obtain the battery set charge/discharge electric current；The first switch module, battery pack, sampling resistor and the charging device of outside access are controlled the first switch module, the break-make of second switch module by the control module, may make up charge circuit；The battery pack, second switch module, sampling resistor and the load of outside access are controlled the first switch module, the break-make of second switch module by the control module, may make up discharge loop.Current detection circuit provided by the utility model, circuit space is not only significantly reduced, and greatly reduce circuit cost.
Description
Technical field
The utility model belongs to field of battery management, more particularly to a kind of current detection circuit.
Background technology
Lithium battery turns into the main flow that today's society may move product power supply, according to the characteristic of lithium battery itself, needs
It is monitored in real time in charging and discharging process.Wherein, electric current is exactly whether a measurement system is in abnormality
Important parameter.If charging current is excessive, more than lithium battery itself maximum charging current, prolonged charging can cause lithium battery
Leakage, cause fire；Discharge current is excessive, and more than lithium battery itself maximum discharge current, prolonged electric discharge can cause battery
Accelerated ageing, capacity attenuation.In battery management system application, charging and discharging overcurrent protection turns into indispensable one
Basic function.
The current detection circuit in battery management system is applied at present, mainly includes operational amplifier and multiple resistance,
The detection to electric current during battery set charge/discharge is realized by the working characteristics of operational amplifier.Above-mentioned current detection circuit,
Because employing operational amplifier, cost is higher；And need to use operational amplifier and multiple resistance simultaneously, occupy larger sky
Between.
Utility model content
The utility model embodiment provides a kind of current detection circuit, it is intended to solves the electric current of existing battery management system
Detect the problem of circuit cost is higher and space-consuming is larger.
The utility model embodiment is achieved in that a kind of current detection circuit, described applied to battery management system
Battery management system includes battery pack；Characterized in that, the current detection circuit includes：
First switch module, second switch module, sampling resistor；And control module,
The control module can control the first switch module, second switch module break-make, and to the sampling resistor
On voltage detected, to obtain the battery set charge/discharge electric current；
The first switch module, battery pack, sampling resistor and the charging device of outside access pass through the control module
To the first switch module, the control of the break-make of second switch module, charge circuit may make up；
The battery pack, second switch module, sampling resistor and the load of outside access are by the control module to institute
First switch module, the control of the break-make of second switch module are stated, may make up discharge loop.
Current detection circuit provided by the utility model, charging device, first switch module, battery pack and sampling resistor phase
Mutually series connection may make up charge circuit；Battery pack, second switch module, load and sampling resistor, which are serially connected may make up, to discharge back
Road；By the innovation connection method of control module and above-mentioned charge circuit and discharge loop, complete to battery pack in discharge and recharge
The monitoring of electric current in journey, due to taking full advantage of the working characteristics of control module, reduce the use of component in circuit, not only
Circuit space is significantly reduced, and greatly reduces circuit cost, solves the electric current inspection of existing battery management system
Slowdown monitoring circuit cost is higher and the problem of space-consuming is larger.
Brief description of the drawings
Fig. 1 is a kind of current detection circuit that the utility model embodiment one provides；
Fig. 2 is a kind of current detection circuit that the utility model embodiment two provides.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
The term used in the utility model embodiment is only merely for the purpose of description specific embodiment, and is not intended to
Limit the utility model." one kind " of singulative used in the utility model embodiment and appended claims,
" described " and "the" are also intended to including most forms, unless context clearly shows that other implications.It is also understood that herein
The term "and/or" used refers to and any or all may be combined comprising the associated list items purpose of one or more.
It will be appreciated that though it may be described in the utility model embodiment using term first, second, third, etc. each
Kind information, but these information should not necessarily be limited by these terms.These terms are only used for same type of information being distinguished from each other out.Take
Certainly in linguistic context, word as used in this " if " can be construed to " ... when " or " when ... " or " response
In it is determined that ".Moreover, term " comprising ", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that
Process, method, article or the equipment of a series of elements, which must be included, not only includes those key elements, but also including not arranging clearly
The other element gone out, or also include for this process, method, article or the intrinsic key element of equipment.
Current detection circuit provided by the utility model, charging device, first switch module, battery pack and sampling resistor phase
Mutually series connection may make up charge circuit；Battery pack, second switch module, load and sampling resistor, which are serially connected may make up, to discharge back
Road；By the innovation connection method of control module and above-mentioned charge circuit and discharge loop, complete to battery pack in discharge and recharge
The monitoring of electric current in journey, due to taking full advantage of the working characteristics of control module, reduce the use of component in circuit, not only
Circuit space is significantly reduced, and greatly reduces circuit cost, solves the electric current inspection of existing battery management system
Slowdown monitoring circuit cost is higher and the problem of space-consuming is larger.
A kind of current detection circuit provided by the utility model will be described in detail below.
Embodiment one
Fig. 1 shows the circuit diagram that the utility model embodiment one provides, a kind of current detection circuit, applied to cell tube
Reason system, the battery management system include battery pack；Characterized in that, the current detection circuit includes：
First switch module, second switch module, sampling resistor；And control module,
The control module can control the first switch module, second switch module break-make, and to the sampling resistor
On voltage detected, to obtain the battery set charge/discharge electric current；
The first switch module, battery pack, sampling resistor and the charging device of outside access pass through the control module
To the first switch module, the control of the break-make of second switch module, charge circuit may make up；
The battery pack, second switch module, sampling resistor and the load of outside access are by the control module to institute
First switch module, the control of the break-make of second switch module are stated, may make up discharge loop.
In the utility model embodiment, as shown in figure 1, charging device is charger, the negative pole ground connection of battery pack, sampling
Resistance is R0, and R0 first end and battery electrode couple, one end of the negative pole and second switch module of the second end and charger
Coupling.
In the utility model embodiment, control module includes the first detection port, for detecting sampling resistor R0 voltages；
First division module is connected between charger negative pole and the first detection port.
In the utility model embodiment, control module also includes the first control port and the second control port；First control
Port processed connects first switch module, the second control port connection second switch module.Control module passes through the first control port
Different magnitude of voltage control first switch module break-makes are exported, exporting different magnitudes of voltage by the second control port controls second switch
Module break-make, specifically, first switch module and second switch module are by default, in this reality to the response mode of voltage
With in new embodiment, as an example, we can set first switch module in response to high level, i.e., when the second control port
When exporting high level, first switch module closure, conversely, when the second control port exports low level, first switch module is broken
Open.It should be appreciated that first switch module and second switch module are not necessarily identical to the response mode of voltage signal, according to specific
Need to be set.
In the utility model embodiment, as an example, we set first switch module and second switch module
For in response to high level.When the first control port exports high level, and the second control port exports low level, first switch module
Closure, second switch module disconnect, and now charger, first switch module, battery pack and sampling resistor R0 form charge circuit；
When the first control port exports low level, and the second control port exports high level, first switch module closure, second switch mould
Block disconnects, and now battery pack, second switch module, load and sampling resistor R0 form discharge loop.
In the utility model embodiment, control module also includes the second detection port and output port, the second test side
Mouth the second division module of connection, the second division module are connected to charger positive pole, and output port connects the first division module.It is above-mentioned
The voltage signal that output port detects in response to the second detection port, specifically：When second detection port detect high level,
Output port exports high level, and when the second detection port detects low level, then output port exports low level.
In the utility model preferably one embodiment, above-mentioned current detection circuit also includes being connected to the first partial pressure mould
Filtration module between block and the first detection port.
Current detection circuit provided by the utility model, charging device, first switch module, battery pack and sampling resistor phase
Mutually series connection may make up charge circuit；Battery pack, second switch module, load and sampling resistor, which are serially connected may make up, to discharge back
Road；By the innovation connection method of control module and above-mentioned charge circuit and discharge loop, complete to battery pack in discharge and recharge
The monitoring of electric current in journey, due to taking full advantage of the working characteristics of control module, reduce the use of component in circuit, not only
Circuit space is significantly reduced, and greatly reduces circuit cost, solves the electric current inspection of existing battery management system
Slowdown monitoring circuit cost is higher and the problem of space-consuming is larger.
Embodiment two
Fig. 2 shows the circuit diagram that the utility model embodiment two provides.In the utility model embodiment, a kind of electric current
Circuit is detected, applied to battery management system, the battery management system includes battery pack；Characterized in that, the electric current inspection
Slowdown monitoring circuit includes：
First switch module, second switch module, sampling resistor, load；And control module,
The control module can control the first switch module, second switch module break-make, and to the sampling resistor
On voltage detected, to obtain the battery set charge/discharge electric current；
The first switch module, battery pack, sampling resistor and the charging device of outside access pass through the control module
To the first switch module, the control of the break-make of second switch module, charge circuit may make up；
The battery pack, second switch module, sampling resistor and the load of outside access are by the control module to institute
First switch module, the control of the break-make of second switch module are stated, may make up discharge loop.
In the utility model embodiment, first switch module, second switch module are all ON/OFF switches, such as Fig. 2 institutes
Show, first switch module is to switch ON/OFF-1, and second switch module is to switch ON/OFF-2.
First division module includes resistance R1 and R2, and the second division module includes resistance R3 and R4.Charging device is charging
Device, R0 are sampling resistor.
In the utility model embodiment, control module is MCU controllers, including output port IO-1, the first test side
Mouth IO-2, the second control port IO-3, the detections of the first control port IO-4 and second port IO-5.MCU controllers pass through above-mentioned
The cooperation of each port, control first switch module, second switch module break-make, and the voltage on sampling resistor R0 is examined
Survey, then electric current of the battery pack in charge and discharge process is obtained by logic of propositions computing.
As shown in Fig. 2 in the utility model embodiment, charger, switch ON/OFF-1, battery pack and sampling resistor R0
It is serially connected and may make up charge circuit, battery pack, switch ON/OFF-2, load and sampling resistor R0 is serially connected and may make up electric discharge
Loop.Output port IO-1 connection R2 one end, the R2 other ends access battery electrode by R1 and sampling resistor R0.First detection
Node between port IO-2 access resistance R1 and R2；Second control port IO-3 connecting valves ON/OFF-2；First control terminal
Mouth IO-4 connecting valves ON/OFF-1；Resistance R4 one end is grounded, and the other end connects the detection port IO-5 of resistance R3 and second respectively,
The resistance R3 other ends access charger positive pole；Charger negative pole connects sampling resistor R0 and R1 connected nodes, battery electrode ground connection.
The operation principle of Fig. 2 circuit diagrams described further below.
In the utility model embodiment, the first control port IO-4 of control module is controlled by exporting different magnitudes of voltage
ON/OFF-1 break-makes are switched, the second control port IO-3 is by exporting different magnitude of voltage controlling switch ON/OFF-2 break-makes.Specifically
, switch ON/OFF-1 and switch ON/OFF-2 are by default, in the utility model embodiment to the response mode of voltage
In, as an example, we can set switch ON/OFF-1 in response to high level, i.e., when the second control port IO-4 exports high electricity
Usually, ON/OFF-1 closures are switched, conversely, when the second control port IO-4 exports low level, switch ON/OFF-1 disconnects.
It should be appreciated that switch ON/OFF-1 and switch ON/OFF-2 are not necessarily identical to the response mode of voltage signal, root
Needed according to specific to be set.In the utility model embodiment, as an example, we will switch ON/OFF-1 and switch
ON/OFF-2 is both configured in response to high level.
When the first control port IO-4 exports high level, and the second control port IO-3 exports low level, ON/OFF- is switched
1 closure, switch ON/OFF-2 are disconnected, and now charger, switch ON/OFF-1, battery pack and sampling resistor R0 are formed and charged back
Road, charger access battery pack, starts to charge for battery pack.Charging current now is-I, and sampling resistor R0 one end is grounded,
Therefore the node voltage U between resistance R1 and sampling resistor R0Fill=-I*R0, it is a negative value, it is impossible to directly controlled by MCU
Device is detected.Therefore the utility model provides a kind of circuit connecting mode of innovation, by voltage UFillRegulation on the occasion of, for
MCU controllers detect, and details are as follows：
Charger access circuit after, second detection port IO-5 detects high level, then output port IO-1 in response to
After the high level that second detection port IO-5 is detected, it will output high level, export the concrete numerical value of high level according to whole
The component parameter of individual circuit is set.Now, the node voltage U between resistance R1 and sampling resistor R0FillFor negative value, output
Port IO-1 exports high level, then after resistance R1 and R2 partial pressures, the node voltage U between resistance R1 and resistance R2Fill'
For on the occasion of.In order to ensure UFill' it is on the occasion of the parameter that resistance R1 and R2 resistance need to consider other components in circuit is had
Body is set.
First detection port IO-2 of MCU controllers is used to detect voltage UFill', then using MCU controllers sampling and
Logical operation function, mode, operation method corresponding to setting are built according to the parameter value of each component in circuit and circuit
Then, then can be by the U that measuresFill' be worth to current value of the battery pack in charging process.
In the utility model embodiment, as an example, resistance R0=1.32 Ω, R1=100K Ω, R2=100K Ω, if
First detection port IO-2 detects U'FillThe high level of=2.665V, output port IO-1 output is 5V, then according to formula U'Fill
=(5-UFill) * R1/ (R1+R2), U can be obtained by bringing data intoFill=-0.33V, finally according to formula UFill=-IFill* R0 extrapolates charging electricity
Stream-IFillFor -0.250A.
When the first control port IO-4 exports low level, and the second control port IO-3 exports high level, ON/OFF- is switched
2 closures, switch ON/OFF-1 disconnect, and now battery pack, switch ON/OFF-2, load and sampling resistor R0 form discharge loop,
Discharge current is IPut, the node voltage U between resistance R1 and sampling resistor R0Put=IPut* R0, be on the occasion of.
Now, switch ON/OFF-1 to disconnect, charger disconnects with battery pack, switch ON/OFF-2 closures, the second test side
Mouth IO-5 detects low level, then after the low level that port IO-1 detects in response to the second detection port IO-5, it will defeated
Go out low level, export low level concrete numerical value and set according to the component parameter of whole circuit, usually, output 0V is
Can.After resistance R1 and R2 partial pressures, the node voltage U' between resistance R1 and R2PutFor on the occasion of the first detection of MCU controllers
Port IO-2 is used to detect voltage U'Put, the then sampling using MCU controllers and logical operation function, according to each in circuit
The parameter value of component and circuit build mode, algorithm corresponding to setting, then can be by the U that measuresFill' be worth to
Current value of the battery pack in discharge process.
In the utility model embodiment, as an example, resistance R0=1.32 Ω, R1=100K Ω, R2=100K Ω, if
Measure UPutThe low level value of=0.66V, output port IO-1 output is 0V, then according to UPut=IPut* R0*R2/ (R1+R2) can be in the hope of
Go out IPut=1A.
In the utility model preferably one embodiment, above-mentioned current detection circuit also includes being connected to resistance R1 and R2
Filtration module between node and the first detection port IO-2, in the utility model embodiment, filtration module is RC filtered electricals
Road, including resistance R5 and electric capacity C1；Electric capacity C1 one end is grounded, and the other end connects the detection port IO-2 of resistance R5 and first respectively,
Node between the resistance R5 other ends connection resistance R1 and R2.
Current detection circuit provided by the utility model, charging device, first switch module, battery pack and sampling resistor phase
Mutually series connection may make up charge circuit；Battery pack, second switch module, load and sampling resistor, which are serially connected may make up, to discharge back
Road；By the innovation connection method of control module and above-mentioned charge circuit and discharge loop, complete to battery pack in discharge and recharge
The monitoring of electric current in journey, due to taking full advantage of the working characteristics of control module, reduce the use of component in circuit, not only
Circuit space is significantly reduced, and greatly reduces circuit cost, solves the electric current inspection of existing battery management system
Slowdown monitoring circuit cost is higher and the problem of space-consuming is larger.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (9)
1. a kind of current detection circuit, applied to battery management system, the battery management system includes battery pack；Its feature exists
In the current detection circuit includes：
First switch module, second switch module, sampling resistor and control module,
The control module can control the first switch module, second switch module break-make, and on the sampling resistor
Voltage is detected, to obtain the battery set charge/discharge electric current；
The first switch module, battery pack, sampling resistor and the charging device of outside access are by the control module to institute
First switch module, the control of the break-make of second switch module are stated, may make up charge circuit；
The battery pack, second switch module, sampling resistor and the load of outside access are by the control module to described the
The break-make control of one switch module, second switch module, may make up discharge loop.
2. current detection circuit as claimed in claim 1, it is characterised in that the negative pole ground connection of the battery pack；
The first end of the sampling resistor couples with the battery electrode, and the second end of the sampling resistor fills with the charging
The negative pole put and one end coupling of the second switch module.
3. current detection circuit as claimed in claim 2, it is characterised in that the circuit also includes the first division module；
First division module is connected between the second end of the sampling resistor and the control module.
4. current detection circuit as claimed in claim 3, it is characterised in that the control module includes the first detection port,
The first detection port is used to detect sampling resistor voltage, obtains charging and discharging currents；
First division module is connected between the second end of the sampling resistor and the first detection port.
5. current detection circuit as claimed in claim 4, it is characterised in that the control module also includes an output port；
First division module is also connected with the output port.
6. current detection circuit as claimed in claim 4, it is characterised in that the first detection port and first partial pressure
A filtration module has been also coupled between module.
7. current detection circuit as claimed in claim 1, it is characterised in that the control module include the first control port and
Second control port；
First control port connects the first switch module, and second control port connects the second switch mould
Block.
8. current detection circuit as claimed in claim 1, it is characterised in that the control module also includes being used to pass through detection
The magnitude of voltage of the current detection circuit judges the second the test side whether charging device access for the control module
Mouthful；
The second detection port is coupled between the charging device positive pole and the first switch module.
9. current detection circuit as claimed in claim 8, it is characterised in that be coupled with second point before the second detection port
Die block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720730641.1U CN207039230U (en) | 2017-06-22 | 2017-06-22 | A kind of current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720730641.1U CN207039230U (en) | 2017-06-22 | 2017-06-22 | A kind of current detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207039230U true CN207039230U (en) | 2018-02-23 |
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ID=61468868
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720730641.1U Active CN207039230U (en) | 2017-06-22 | 2017-06-22 | A kind of current detection circuit |
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| CN (1) | CN207039230U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276158A (en) * | 2017-06-22 | 2017-10-20 | 深圳拓邦股份有限公司 | A kind of current detection circuit |
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2017
- 2017-06-22 CN CN201720730641.1U patent/CN207039230U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276158A (en) * | 2017-06-22 | 2017-10-20 | 深圳拓邦股份有限公司 | A kind of current detection circuit |
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