CN104079042B - Voltage and current scanning circuit used for rechargeable battery - Google Patents
Voltage and current scanning circuit used for rechargeable battery Download PDFInfo
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- CN104079042B CN104079042B CN201410349871.4A CN201410349871A CN104079042B CN 104079042 B CN104079042 B CN 104079042B CN 201410349871 A CN201410349871 A CN 201410349871A CN 104079042 B CN104079042 B CN 104079042B
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Abstract
The invention relates to a voltage and current scanning circuit used for a rechargeable battery. The scanning circuit comprises a control module, an amplification rectifier module, a scanning module and a detection module, wherein multi-way PWM signals and a plurality of switching commands can be generated by the control module and transmitted to the amplification rectifier module and the scanning module respectively; a plurality of PWM signals can be amplified and rectified by the amplification rectifier module and the amplified and rectified signals can be transmitted to the two ends of the rechargeable battery corresponding to the amplification rectifier module; a plurality of switching groups of the scanning circuit can be switched on and off through corresponding switching commands, so that the voltage and current of the battery accessed to the switching groups can be scanned in turns, and the scanning and sampling information can be transmitted to the detection module; the scanning and sampling information can be fed back to the control module by the detection module; so that the value of the PWM signals corresponding to the scanned and sampled battery can be adjusted by the control module according to the feedback information. Compared with the prior art, the voltage and current scanning circuit used for the rechargeable battery prolongs the service life of the battery, prevents battery charging explosion, and improves the battery charging safety.
Description
Technical field
The present invention relates to a kind of scanning circuit, more particularly to a kind of voltage x current scanning circuit for rechargeable battery.
Background technology
At present, new-energy automobile has been widely used in live and work.Existing new-energy automobile is mostly with lithium battery
Group is power resources, especially pure electric automobile and plug-in hybrid-power automobile.During new-energy automobile routine use,
Battery pack is in high frequency time, large current density electricity condition.Due to production technology, the difference of working environment, deposit between battery cell
In certain difference, use with the multiple discharge and recharge of lithium battery group, lithium battery group terminal voltage disequilibrium effect constantly adds up, end
Easily there is overdischarge phenomenon in the minimum cell of voltage, cause its internal resistance to increase, and then affect the normal of whole battery pack
Use.For example：The too high or too low entirety that can all damage lithium battery of electric current and terminal voltage of lithium battery, may result in battery quick-fried
Fried or other failures and jeopardize the safety of user, therefore, in order to ensure safely and reliably using battery and to ensure that battery is filling
It is without damage when electricity and electric discharge, it is necessary to which that the magnitude of voltage and current value of every batteries are accurately measured and monitored.
The content of the invention
In order to solve because the charging voltage of lithium battery is excessive and lithium battery overdischarge etc. and the battery that causes integrally are damaged,
The problems such as blast, it is necessary to which a kind of voltage x current scanning circuit for rechargeable battery is provided.
The present invention is achieved by the following technical solutions：A kind of voltage x current scanning circuit for rechargeable battery, bag
Include control module, amplify rectification module, scan module and detection module；
The control module produces multi-channel PWM signal and several switch orders, and is delivered to amplification rectification module respectively
And scan module；
The amplification rectification module amplifies multiple pwm signals, rectification, and is delivered to corresponding rechargeable battery respectively
Two ends, are that battery charges；
The scan module includes several switches sets, and several switches sets are corresponded respectively with several switch orders
Electrical connection, and its break-make is controlled by switch order with realize in turn to accessing each switches set in battery electric current and voltage enter
Row scanning, and scanning sample intelligence is delivered to into detection module；
The detection module will scan sample intelligence and feed back to control module, and be adjusted according to feedback information by control module
The value of pwm signal corresponding with the battery of scanned sampling.
Further, the scan module include at least 5 separate switches sets, respectively first switch group, second
Switches set, the 3rd switches set, the 4th switches set and the 5th switches set.One is accessed between the second switch group and the 3rd switches set
First battery, to export the information of voltage of the first battery in detection module, and between the second switch group and the first battery
One first sample resistance is provided with, the first sample resistance two ends concatenate respectively with first switch group and second switch group, to export
The sample intelligence of the first sample resistance is in detection module.One second is accessed between 4th switches set and the 5th switches set electric
Pond, to export the information of voltage of the second battery in detection module, and is provided with one between the 4th switches set and the second battery
Second sample resistance, the second sample resistance two ends concatenate respectively with the 3rd switches set and the 4th switches set, are taken with exporting second
The sample intelligence of sample resistance is in detection module.
First cell parallel has one first load resistance, for the excessive product of input impedance after preventing battery from disconnecting
Raw interference voltage.Second cell parallel has one second load resistance, for the input impedance after preventing lithium battery from disconnecting
Excessive generation interference voltage.
Further, the amplification rectification module includes at least two separate amplification rectification circuits；Described two amplify
Rectification circuit includes respectively amplifying circuit and rectification circuit.The amplifying circuit is used to amplify corresponding in control module
Pwm signal, and it is delivered to rectification circuit；Rectification circuit the pwm signal after amplification is carried out being exported after rectification and filtering process to
Corresponding battery two ends, think that battery charges.
Further, the detection module includes：
--- Current amplifier detects circuit, and the Current amplifier detection circuit is used for the Current amplifier in sample intelligence simultaneously
Sampling voltage drop value is converted to, and feeds back to control module；
--- voltage follow detects circuit, and the voltage follow detects circuit for following information of voltage and being converted to battery
Voltage drop value, and feed back to control module.First light coupling relay and the light that the second light coupling relay is KAQW214S models
Coupling relay.
Described each switches set is optoelectronic switch group, or for electromagnetic switch group, or be by opening that metal-oxide-semiconductor on-off circuit is constituted
Pass group, or for light coupling relay.
By above-mentioned technical proposal, the present invention is realized to lithium battery for the voltage x current scanning circuit of rechargeable battery
Charging terminal voltage and its charging current are monitored and detect, and adjust the charging terminal voltage of lithium battery by testing result and fill
Electric current, there is charge protection to act on lithium battery, extend the life-span of lithium battery, prevent lithium cell charging from exploding, and carry
Security during high lithium cell charging.
In order to more fully understand and implement, the present invention is described in detail below in conjunction with the accompanying drawings.
Description of the drawings
Fig. 1 is electrical block diagram of the present invention for the voltage x current scanning circuit of rechargeable battery；
Fig. 2 is circuit theory diagrams of the present invention for the voltage x current scanning circuit of rechargeable battery；
Fig. 3 is circuit theory diagrams of the present invention for the scan module of the voltage x current scanning circuit of rechargeable battery.
Specific embodiment
Fig. 1 is referred to, the present invention includes control module 1, amplifies rectification for the voltage x current scanning circuit of rechargeable battery
Module 2, scan module 3 and detection module 4.The control module 1 produces multi-channel PWM signal, and is delivered to amplification rectification module
2；Multiple pwm signals amplify, are delivered to respectively and its one-to-one rechargeable battery after rectification respectively through rectification module 2 is amplified
Two ends, are that battery charges；Simultaneously control module 1 sends several switch orders and is delivered to some of scan module 3 respectively and opens
Guan Zuzhong, with control respectively with the break-make of one-to-one several switches sets of several switch orders；It is each in scan module 3
Individual switches set is respectively connected to corresponding battery；The break-make that control module 1 passes through each switches set of switch order wheel flow control,
To realize respectively being scanned the electric current and voltage of each battery, and scanning sample intelligence is delivered to into detection module 4, is detected
Module 4 will scan and control module 1 fed back to after sample intelligence is processed, and control module 1 is adjusted according to feedback information and is just scanned
The value of the corresponding pwm signal of battery of sampling.When the current value that battery is obtained from feedback information is more than setting value, control module
1 dutycycle for reducing pwm signal corresponding with the battery for being just scanned sampling；When current value that battery is obtained from feedback information etc.
When setting value, control module 1 causes the dutycycle of pwm signal corresponding with the battery for being just scanned sampling constant；When from anti-
When feedforward information obtains the current value of battery less than setting value, control module 1 increases PWM corresponding with the battery for being just scanned sampling
The dutycycle of signal.When the voltage that battery is obtained from feedback information is less than preset value, battery underfill, control module 1 are represented
Output pwm signal corresponding with the battery for being just scanned sampling is kept, to continue as battery charging；When obtaining electricity from feedback information
When the voltage in pond is equal to or more than preset value, represent that battery has been filled with, control module 1 is controlled and the battery pair for being just scanned sampling
The pwm signal answered is 0, is stopped as battery charging.
Refer to Fig. 2, specifically, the control module 1 include a cpu chip 11, the cpu chip be singlechip chip or
Dsp chip or PLC chip.The cpu chip 11 exports at least two pwm signals and at least 5 switch orders.In the present embodiment
In, the CPU exports 3 pwm signals, respectively PWM1 signals, PWM2 signals and PWM3 signals, while 7 switch orders are exported,
Respectively switch order K0, switch order K1, switch order K2, switch order K3, switch order K4, switch order K5, switch
Instruction K6.
The amplification rectification module 2 includes at least two separate amplification rectification circuits.In the present embodiment, this is put
Big rectification module 2 include 3 it is separate and with 3 pwm signals amplify rectification circuit correspondingly respectively.Described 3
Individual amplification rectification circuit includes respectively an amplifying circuit and a rectification circuit.The amplifying circuit is used to amplify corresponding
Pwm signal, and it is delivered to rectification circuit；Rectification circuit the pwm signal after amplification is carried out being exported after rectification and filtering process to
Corresponding battery two ends, think that battery charges.
Fig. 3 is referred to, the scan module 3 includes at least 5 separate switches sets, and in the present embodiment, this is swept
Module 3 is retouched including 7 separate switches sets for being controlled by 7 switch orders respectively, respectively first switch group, the
Two switches sets, the 3rd switches set, the 4th switches set, the 5th switches set, the 6th switches set and the 7th switches set.
Because the present embodiment of the present invention has 3 pwm signal outputs, 7 switch order outputs and 7 switches sets, therefore
The present invention can access 3 separate rechargeable batteries, respectively the first battery Bat1, the second battery Bat2 and the 3rd battery
Bat3.One first battery Bat1 is then accessed between the second switch group and the 3rd switches set, to export the first battery Bat1
Information of voltage in detection module 4, and one first sample resistance is provided between the second switch group and the first battery Bat1
R10；The first sample resistance R10 two ends concatenate respectively with first switch group and second switch group, to export the first sample resistance
The sample intelligence of R10 is in detection module 4.One second battery Bat2 is accessed between 4th switches set and the 5th switches set,
With the information of voltage of the second battery Bat2 of output in detection module 4, and between the 4th switches set and the second battery Bat2
It is provided with one second sample resistance R14；The second sample resistance R14 two ends concatenate respectively with the 3rd switches set and the 4th switches set,
With the sample intelligence of the second sample resistance R14 of output in detection module 4.6th switches set and the 7th switches set are indirectly
Enter one the 3rd battery Bat3, to export the information of voltage of the second battery Bat2 in detection module 4, and the 6th switches set with
One the 3rd sample resistance R17 is provided between 3rd battery Bat3；3rd sample resistance R17 two ends respectively with the 5th switches set and
6th switches set is concatenated, to export the sample intelligence of the 3rd sample resistance R17 in detection module 4.Due to above-mentioned each battery
Internal resistance resistance it is less, about 10m Ω, therefore the resistance of above-mentioned each sample resistance is set to into 0.01 Ω.
The detection module 4 includes that Current amplifier detects circuit and voltage follow detection circuit.The Current amplifier detection
Circuit is used for the Current amplifier in sample intelligence and is converted to sampling voltage drop value, and feeds back to control module 1；The voltage with
It is used to follow information of voltage and be converted to battery voltage drop value with detection circuit, and feeds back to control module 1.In the present embodiment,
Current amplifier detects that circuit and voltage follow detection circuit share a feedback channel.
Further, the first battery Bat1 is parallel with one first load resistance R13, after preventing battery from disconnecting
The excessive generation interference voltage of input impedance；The second battery Bat2 is parallel with one second load resistance R15, for preventing lithium
The excessive generation interference voltage of input impedance after battery disconnection；The 3rd battery Bat3 is parallel with one the 3rd load resistance R16,
For the excessive generation interference voltage of input impedance after preventing lithium battery from disconnecting.
Further, described each switches set is optoelectronic switch group, or for electromagnetic switch group, or be by metal-oxide-semiconductor on-off circuit
The switches set of composition, or for light coupling relay.In the present embodiment, each switches set is light coupling relay, wherein, first opens
Pass group is light coupling relay U3 of one 4 pin packages, and second switch group and the 3rd switches set encapsulate to form one 8 pin packages jointly
Light coupling relay U5, the 4th switches set and the 5th switches set encapsulate light coupling relay U6 to form one 8 pin packages jointly,
Six switches sets and Qi switches sets encapsulate light coupling relay U7 to form one 8 pin packages jointly.
When needing to scan more batteries, can in the manner described above correspond to the number of the pwm signal for increasing output, open
Close the number of instruction, amplify the number of rectification circuit and the number of switches set to realize the scanning to more batteries and monitoring inspection
Survey.
The operation principle of the present invention is as follows：
When being scanned to battery, circuit start, cpu chip 11 produces the signals such as PWM1, PWM2 and PWM3, and conveys
To respectively with the one-to-one 3 amplification rectification circuits of 3 pwm signals in, 3 amplification rectification circuits respectively will
Export to battery two ends corresponding respectively after the driving of PWM1, PWM2 and PWM3 signal, amplification, rectification, it is respectively right with it
Battery is answered to charge；Meanwhile, cpu chip 11 is by the break-make of switch order each switches set of repetitive control in turn realizing to each
The scan round of battery.Cpu chip 11 is as follows to the scanning process of each battery：Battery current is scanned first, from the first battery
Bat1 starts scanning, and the now controlling switch of cpu chip 11 instruction K0, switch order K1 are high level, and other switch orders are low
Level, then only first switch group and the conducting of second switch group, switch are closed, then the sample intelligence of the first sample resistance R10,
That is the terminal voltage of first resistor will pass through first switch group and second switch group is delivered in Current amplifier detection circuit, and electric current is put
After big detection circuit amplifies its current component and a sampling voltage drop value is translated into, and feeds back to cpu chip 11, CPU cores
Piece 11 is just processed the sampling voltage drop value, will the sampling voltage drop value just draw divided by the resistance of the first sample resistance R10
The current value of the first sample resistance R10, because the first sample resistance R10 connects with the first battery Bat1, therefore the current value
Also for the first battery Bat1 current value (because the resistance 100K Ω of the first load resistance R13 is far longer than the first battery Bat1
Internal resistance value 10m Ω, therefore it is negligible to flow through the electric current of the first load resistance R13).When the current value is more than setting value
When, control module 1 reduces the dutycycle of PWM1 signals corresponding with the first battery Bat1；When the current value is equal to setting value,
Control module 1 causes the dutycycle of PWM1 signals constant；When the current value is less than setting value, the increase PWM1 letters of control module 1
Number dutycycle.After finishing to the current scanning of the first battery Bat1, cpu chip 11 is turned to carries out electric current to the second battery Bat2
Scanning, now the controlling switch of cpu chip 11 instruction K2 and switch order K3 are high level, and other switch orders are low level, this
When the present invention to the current scanning principle of the second battery Bat2 and the process to PWM2 signals and its electricity to the first battery Bat1
Scan flow principle is as the process to PWM1 signals, therefore here is not repeated.The current scanning of the second battery Bat2 is finished
Afterwards, cpu chip 11 is turned to carries out current scanning to the 3rd battery Bat3, now the controlling switch of cpu chip 11 instruction K4 and switch
Instruction K5 is high level, and other switch orders are low level, now the present invention to the current scanning principle of the 3rd battery Bat3 and
Processing as its current scanning principle to the first battery Bat1 and the process to PWM1 signals to PWM3 signals, therefore here
It is not repeated.
When needing the terminal voltage to battery to be scanned, the terminal voltage of the first battery Bat1 is scanned first, this
When PWM1 signals continue to output, while the controlling switch of cpu chip 11 instruction K1 and switch order K2 are high level, other switches refer to
Make as low level, then only second switch group and the conducting of the 3rd switches set, switch closure, then the voltage at the first battery Bat1 two ends
Information is just delivered to voltage follow detection circuit by second switch group and the 3rd switches set, and voltage follow detection circuit follows the electricity
Pressure information is simultaneously translated into battery voltage drop value, and feed back to cpu chip 11.When the battery voltage drop value is less than preset value, table
Show battery underfill, cpu chip 11 keeps output PWM1 signals, to continue as battery charging；When the battery voltage drop value be equal to or
During more than preset value, represent that battery has been filled with, it is 0 that cpu chip 11 controls PWM1 signals, stop as battery charging.It is electric to first
After the voltage scanning of pond Bat1 is finished, cpu chip 11 is turned to carries out voltage scanning to the second battery Bat2, now cpu chip 11
Controlling switch instructs K3 and switch order K4 is high level, and other switch orders are low level, and now the present invention is to the second battery
The voltage scanning principle of Bat2 and the process and the process of its voltage scanning principle and PWM1 signals to voltage to PWM2 signals
Equally, thus here is not repeated.After finishing to the voltage scanning of the second battery Bat2, cpu chip 11 is turned to next section the 3rd
Battery Bat3 carries out voltage scanning, and the now controlling switch of cpu chip 11 instruction K5 and K6 is high level, and other switch orders are low
Level, now the present invention to the process of the voltage scanning principle of the 3rd battery Bat3 and PWM3 signals with it to the first battery Bat1
Voltage scanning principle as the process of PWM1 signals, therefore here is not repeated.
The present invention finishes circulating current scanning work and voltage scanning work until all batteries charge.
In addition, the present invention also has other variant embodiments, for example：
(1) the first load resistance R13, the second load resistance R15, the 3rd load resistance R16 are removed, other circuit knots
Structure is constant.
(2) feedback channel of the Current amplifier detection circuit and voltage follow detection circuit is separate, that is, electric
Feedback of the information is returned cpu chip 11 by stream amplification detection circuit and voltage follow detection circuit by a feedback channel respectively, other
Circuit structure is constant.
Relative to prior art, present invention achieves being monitored simultaneously to the charging terminal voltage and its charging current of lithium battery
Detection, and the charging terminal voltage and charging current of lithium battery are adjusted by testing result, there is charge protection to act on lithium battery,
The life-span of lithium battery is extended, prevents lithium cell charging from exploding, improve security during lithium cell charging.
Above-mentioned embodiment is the invention is not limited in, if the various changes or deformation to the present invention are without departing from the present invention
Spirit and scope, if these change and deformation belong to the present invention claim and equivalent technologies within the scope of, then this
It is bright to be also intended to comprising these changes and deform.
Claims (6)
1. a kind of voltage x current scanning circuit for rechargeable battery, it is characterised in that：Including control module, amplify rectification mould
Block, scan module and detection module；
The control module produces multi-channel PWM signal and several switch orders, and is delivered to amplification rectification module respectively and sweeps
Retouch module；
The amplification rectification module is amplified to the multiple pwm signals produced by the control module, rectification, and conveys respectively
To rechargeable battery two ends corresponding with the plurality of pwm signal, realize that the multiple pwm signals produced by the control module are electricity
Charge in pond；
The scan module includes several switches sets, and several switches sets correspond with several switch orders be electrically connected respectively
Connect, and its break-make is controlled by switch order with realize in turn to accessing each switches set in battery electric current and voltage sweep
Retouch, and scanning sample intelligence is delivered to into detection module；
The detection module will scan sample intelligence and feed back to control module, and be adjusted according to feedback information by control module and quilt
The value of the corresponding pwm signal of battery of scanning sampling.
2. the voltage x current scanning circuit for rechargeable battery according to claim 1, it is characterised in that：The scanning mould
Block includes at least 5 separate switches sets, respectively first switch group, second switch group, the 3rd switches set, the 4th switch
Group and the 5th switches set；
One first battery is accessed between the second switch group and the 3rd switches set, to export the information of voltage of the first battery to inspection
In surveying module, and one first sample resistance is provided between the second switch group and the first battery；The first sample resistance two ends
Concatenate with first switch group and second switch group respectively, to export the sample intelligence of the first sample resistance in detection module；
One second battery is accessed between 4th switches set and the 5th switches set, to export the information of voltage of the second battery to inspection
In surveying module, and one second sample resistance is provided between the 4th switches set and the second battery；The second sample resistance two ends
Concatenate with the 3rd switches set and the 4th switches set respectively, to export the sample intelligence of the second sample resistance in detection module.
3. the voltage x current scanning circuit for rechargeable battery according to claim 2, it is characterised in that：Described first is electric
Pond is parallel with one first load resistance, for the excessive generation interference voltage of input impedance after preventing battery from disconnecting；
Second cell parallel has one second load resistance, for the excessive generation of input impedance after preventing lithium battery from disconnecting
Interference voltage.
4. the voltage x current scanning circuit for rechargeable battery according to claim 1, it is characterised in that：It is described to amplify whole
Flow module includes at least two separate amplification rectification circuits；It is described two amplify rectification circuit respectively include amplifying circuit and
Rectification circuit；
The amplifying circuit is used to amplify pwm signal corresponding in control module, and is delivered to rectification circuit；Rectification circuit
Pwm signal after amplification is carried out to export after rectification and filtering process to battery two ends corresponding with pwm signal, to realize by controlling
The pwm signal that molding block is produced is battery charging.
5. the voltage x current scanning circuit for rechargeable battery according to claim 2, it is characterised in that：The detection mould
Block includes：
--- Current amplifier detects circuit, and the Current amplifier detection circuit is used for the Current amplifier in sample intelligence and changes
To sample voltage drop value, and feed back to control module；
--- voltage follow detects circuit, and the voltage follow detects circuit for following information of voltage and being converted to battery pressure drop
Value, and feed back to control module.
6. the voltage x current scanning circuit for rechargeable battery according to claim 2, it is characterised in that：Described each is opened
Pass group is optoelectronic switch group, or for electromagnetic switch group, or is the switches set being made up of metal-oxide-semiconductor on-off circuit, or for optocoupler relay
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410349871.4A CN104079042B (en) | 2014-07-22 | 2014-07-22 | Voltage and current scanning circuit used for rechargeable battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410349871.4A CN104079042B (en) | 2014-07-22 | 2014-07-22 | Voltage and current scanning circuit used for rechargeable battery |
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| Publication Number | Publication Date |
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| CN104079042A CN104079042A (en) | 2014-10-01 |
| CN104079042B true CN104079042B (en) | 2017-04-19 |
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| CN201410349871.4A Active CN104079042B (en) | 2014-07-22 | 2014-07-22 | Voltage and current scanning circuit used for rechargeable battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7145391B2 (en) * | 2018-11-28 | 2022-10-03 | トヨタ自動車株式会社 | power system |
| JP7129008B2 (en) * | 2018-11-29 | 2022-09-01 | トヨタ自動車株式会社 | power system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2507152Y (en) * | 2000-12-05 | 2002-08-21 | 哈尔滨九洲电气股份有限公司 | Intelligent accumulator tester |
| CN201853780U (en) * | 2010-06-02 | 2011-06-01 | 长沙三海电子科技有限公司 | Interface device for installation and detection/repair for batteries of electric vehicle |
| CN201860149U (en) * | 2010-11-26 | 2011-06-08 | 西安欧瑞特电气有限责任公司 | Controller integrating functions of battery inspection and equalizing charge |
| CN201928059U (en) * | 2011-03-22 | 2011-08-10 | 山东电科四维电气股份有限公司 | Storage battery discharging device |
-
2014
- 2014-07-22 CN CN201410349871.4A patent/CN104079042B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2507152Y (en) * | 2000-12-05 | 2002-08-21 | 哈尔滨九洲电气股份有限公司 | Intelligent accumulator tester |
| CN201853780U (en) * | 2010-06-02 | 2011-06-01 | 长沙三海电子科技有限公司 | Interface device for installation and detection/repair for batteries of electric vehicle |
| CN201860149U (en) * | 2010-11-26 | 2011-06-08 | 西安欧瑞特电气有限责任公司 | Controller integrating functions of battery inspection and equalizing charge |
| CN201928059U (en) * | 2011-03-22 | 2011-08-10 | 山东电科四维电气股份有限公司 | Storage battery discharging device |
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