CN106921204A - Low-speed electronic car lithium ion battery charge-discharge protection circuit - Google Patents
Low-speed electronic car lithium ion battery charge-discharge protection circuit Download PDFInfo
- Publication number
- CN106921204A CN106921204A CN201710339941.1A CN201710339941A CN106921204A CN 106921204 A CN106921204 A CN 106921204A CN 201710339941 A CN201710339941 A CN 201710339941A CN 106921204 A CN106921204 A CN 106921204A
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- Prior art keywords
- module
- lithium ion
- ion battery
- discharge
- low
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The present invention relates to Management Technology of Lithium-ion Battery; it discloses a kind of low-speed electronic car lithium ion battery charge-discharge protection circuit; when charging and discharging currents meet or exceed the rotection thresholds of setting, charge closing and the power MOSFET of electric discharge play a protective role to lithium battery.Low-speed electronic car lithium ion battery charge-discharge protection circuit in the present invention, including：Sampling module, amplifier module, comparator module, selector module, comparator module；The sampled signal of the sampling module connects the input of amplifier module, and the output end of amplifier module connects an input of comparator module；The register module connects another input of comparator module by selector module；The control end of the output end connection lithium ion charge-discharge electric power MOSFET of the comparator module.The present invention is applied to low-speed electronic car lithium ion battery charge and discharge protecting.
Description
Technical field
The present invention relates to Management Technology of Lithium-ion Battery, and in particular to a kind of low-speed electronic car lithium ion battery discharge and recharge is protected
Protection circuit.
Background technology
In recent years, the energy and environmental protection has turned into the core subject of countries in the world sustainable development, and new-energy automobile is special
It is one of development strategy that pure electric automobile also rises to many countries in succession.With respect to bus, passenger car and Special type transportation vehicle
Etc. high speed electric motor car, low-speed electronic car is mainly used as short distance walking-replacing tool, there is extensive latent using colony and huge market
Power.
The battery that the power resources of low-speed electronic car are carried in it, including lead-acid battery and lithium ion battery.With plumbic acid electricity
Pond is compared, lithium ion battery is because its energy density is high, average output voltage is high, charge efficiency is high, output power, self discharge
Small, operating temperature range is wide, long service life the advantages of and progressively as low-speed electronic car major impetus battery.But, lithium
Ion battery must have special protection circuit in use, to prevent excessive, super-charge super-discharge of charging and discharging currents etc. from damaging battery
Situation occur.
The content of the invention
The technical problems to be solved by the invention are：Propose a kind of low-speed electronic car lithium ion battery charge and discharge protecting electricity
Road, when charging and discharging currents meet or exceed the rotection thresholds of setting, by charge closing and the power MOSFET of electric discharge, to lithium electricity
Pond plays a protective role.
The technical solution adopted for the present invention to solve the technical problems is：
Low-speed electronic car lithium ion battery charge-discharge protection circuit, including：Sampling module, amplifier module, comparator mould
Block, selector module, comparator module；The sampled signal of the sampling module connects the input of amplifier module, amplifier
The output end of module connects an input of comparator module；The register module connects comparator by selector module
Another input of module；The control end of the output end connection lithium ion charge-discharge electric power MOSFET of the comparator module；
The sampling module, for being sampled to lithium ion battery charging and discharging currents, extracts the electricity at sampling module two ends
Pressure is input into amplifier module as sampled signal；
The amplifier module, for completing to adjust the amplification of sampled signal and polarity of voltage, to meet late-class circuit
Input requirements；
The register module, for completing the preset of multiple protection voltage thresholds according to its address size；
The selector module, for the address value according to input, selects corresponding unique preset from register module
Threshold value, protection voltage threshold when being worked as current lithium ion battery；
The comparator module, for sampled voltage signal to be compared with current protection voltage threshold, and exports one
Individual high level or low level realize in charge and discharge process that electric current surpasses as one of the grid control signal of discharge and recharge MOSFET
To the closing of charging valve MOSFET or discharge tube MOSFET during overprotection threshold value.
Used as further optimization, the sampling module is one or is made up of multiple resistance in parallel.
Used as further optimization, the amplifier module is voltage follower.
The beneficial effects of the invention are as follows：
Charging, the discharge prevention to lithium ion battery are realized, prevents from causing battery-heating when charge or discharge electric current is excessive
And damage or cause security incident, extend battery.
Brief description of the drawings
Fig. 1 is the application schematic diagram of the lithium ion charge-discharge protection circuit in embodiment.
Specific embodiment
The present invention is directed to propose a kind of low-speed electronic car lithium ion battery charge-discharge protection circuit, when charging and discharging currents reach
Or during more than the rotection thresholds for setting, charge closing and the power MOSFET of electric discharge play a protective role to lithium battery.
The circuit includes five functional module：
1. sampling module, uses the high-power of one or more parallel connections, high accuracy, low resistance (milliohm level), low temperature system
Several resistance, completes the sampling to charging and discharging currents；
2. amplifier module, completes the amplification to sampled signal, polarity of voltage and adjusts；
3. register module, the preset of multiple protection voltage thresholds is completed according to its address size；
4. selector module, according to the address value of input, selects corresponding unique preset threshold value from register module, makees
Protection voltage threshold during for work at present；
5. comparator module, sampled voltage signal is compared with current protection voltage threshold, and by output level
One of grid control signal as discharge and recharge MOSFET, realizes in charge and discharge process, to filling when electric current is more than rotection thresholds
The closing of fulgurite or discharge tube, reaches the purpose of protection battery.
Below in conjunction with the accompanying drawings and embodiment the solution of the present invention is further described：As shown in figure 1, in the present embodiment
Low-speed electronic car lithium ion battery charge-discharge protection circuit, including：Sampling module, amplifier module, comparator module, selection
Device module, comparator module；The sampled signal of the sampling module connects the input of amplifier module, amplifier module it is defeated
Go out an input of end connection comparator module；The register module connects the another of comparator module by selector module
One input；The control end of the output end connection lithium ion charge-discharge electric power MOSFET of the comparator module；
When implementing, the realization of each functional module is as follows：
First, sampling module：
The acquisition of sampled signal is completed by sampling module.Sampling module includes the high-power, high-precision of one or more parallel connections
Degree, low resistance (milliohm level), the resistance of low-temperature coefficient, complete the current sample to charging and discharging lithium battery, and with voltage signal
Form present, i.e. the magnitude of voltage at sampling resistor two ends, usually millivolt level.In actual applications, it is necessary to according to sampling resistor
Power consumption size, it is considered to whether need to add heat abstractor.
Actual charging and discharging current threshold size, is calculated by " voltage threshold of setting/sampling resistor resistance ".
2nd, amplifier module：
Reason amplifier module is completed at sampled signal.Amplifier module completes the amplification and polarity of voltage to sampled signal
(the sampled voltage signal polarity of charging and discharging is conversely, i.e. for adjustment：Assuming that it is then negative when discharging just to be when charging), to meet
The input requirements of late-class circuit, generally using voltage follower, it is ensured that output voltage size is sampled voltage size.
3rd, register module：
Protection voltage threshold setting is completed by register module.The setting of rotection thresholds, can be according to its address of register
The multiple different voltage thresholds of size setting, such as：2 bit address have four states (00,01,10 and 11), can set as needed
Fixed 4 different voltage thresholds are (such as：40mV, 60mV, 80mV and 100mV).Similarly, if 3 bit address, then 8 can be set
Individual voltage threshold.
4th, selector module：
Protection voltage threshold selection is completed by selector module.The charging and discharging currents value protected as needed, with reference to sampling
Resistance, can calculate corresponding voltage protection threshold value.Address and voltage threshold corresponding table according to register, input are corresponding
Address, you can by the selected required voltage rotection thresholds of selector, and as the protection voltage threshold of work at present, change address
Also protection voltage threshold is changed immediately, in such as the 3rd step：01 corresponding 60mV.
5th, comparator module：
Protection control signal output is completed by comparator module.Comparator module by sampled voltage signal with setting work
It is compared as voltage threshold, and (setting voltage threshold value connects the "+" end of comparator, sampling to export a high level or low level
Voltage signal connects the "-" end of comparator, and low level is exported during protection triggering；Otherwise output high level), this level signal is used as filling
Discharge one of grid control signal of MOSFET, realizes in charge and discharge process, when electric current exceedes rotection thresholds to charging valve or
The closing of discharge tube, cuts off charge circuit or discharge loop, reaches the purpose of protection lithium ion battery.
Claims (3)
1. low-speed electronic car lithium ion battery charge-discharge protection circuit, it is characterised in that including：Sampling module, amplifier module,
Comparator module, selector module, comparator module；The sampled signal of the sampling module connects the input of amplifier module
End, the output end of amplifier module connects an input of comparator module；The register module passes through selector module
Connect another input of comparator module；The output end connection lithium ion charge-discharge electric power MOSFET of the comparator module
Control end；
The sampling module, for being sampled to lithium ion battery charging and discharging currents, the voltage for extracting sampling module two ends is made
For sampled signal is input into amplifier module；
The amplifier module, for completing to adjust the amplification of sampled signal and polarity of voltage, to meet the defeated of late-class circuit
Enter requirement；
The register module, for completing the preset of multiple protection voltage thresholds according to its address size；
The selector module, for the address value according to input, selects corresponding unique preset threshold value from register module,
Protection voltage threshold when being worked as current lithium ion battery；
The comparator module, for sampled voltage signal to be compared with current protection voltage threshold, and output one is high
Level or low level realize in charge and discharge process that electric current exceedes to be protected as one of the grid control signal of discharge and recharge MOSFET
Closing during shield threshold value to charging valve MOSFET or discharge tube MOSFET.
2. low-speed electronic car lithium ion battery charge-discharge protection circuit as claimed in claim 1, it is characterised in that the sampling
Module is one or is made up of multiple resistance in parallel.
3. low-speed electronic car lithium ion battery charge-discharge protection circuit as claimed in claim 1, it is characterised in that the amplification
Device module is voltage follower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710339941.1A CN106921204A (en) | 2017-05-15 | 2017-05-15 | Low-speed electronic car lithium ion battery charge-discharge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710339941.1A CN106921204A (en) | 2017-05-15 | 2017-05-15 | Low-speed electronic car lithium ion battery charge-discharge protection circuit |
Publications (1)
| Publication Number | Publication Date |
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| CN106921204A true CN106921204A (en) | 2017-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710339941.1A Pending CN106921204A (en) | 2017-05-15 | 2017-05-15 | Low-speed electronic car lithium ion battery charge-discharge protection circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082453A (en) * | 2009-11-30 | 2011-06-01 | 三洋电机株式会社 | Equalization device, battery system and electric vehicle including the same and equalization processing program |
| CN102082452A (en) * | 2009-11-30 | 2011-06-01 | 三洋电机株式会社 | Equalization device, equalization processing program, battery system and electric vehicle |
| CN102122832A (en) * | 2011-01-26 | 2011-07-13 | 陈冠豪 | Lithium ion battery management system |
| US20120253714A1 (en) * | 2011-04-01 | 2012-10-04 | Intel Corporation | Battery voltage measurement |
| CN202888895U (en) * | 2012-10-17 | 2013-04-17 | 北京川江源科技有限公司 | Battery pack balancing device and battery pack management system comprising the same |
-
2017
- 2017-05-15 CN CN201710339941.1A patent/CN106921204A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082453A (en) * | 2009-11-30 | 2011-06-01 | 三洋电机株式会社 | Equalization device, battery system and electric vehicle including the same and equalization processing program |
| CN102082452A (en) * | 2009-11-30 | 2011-06-01 | 三洋电机株式会社 | Equalization device, equalization processing program, battery system and electric vehicle |
| CN102122832A (en) * | 2011-01-26 | 2011-07-13 | 陈冠豪 | Lithium ion battery management system |
| US20120253714A1 (en) * | 2011-04-01 | 2012-10-04 | Intel Corporation | Battery voltage measurement |
| CN202888895U (en) * | 2012-10-17 | 2013-04-17 | 北京川江源科技有限公司 | Battery pack balancing device and battery pack management system comprising the same |
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Application publication date: 20170704 |