CN202218007U - Power lithium ion battery protective circuit - Google Patents

Power lithium ion battery protective circuit Download PDF

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Publication number
CN202218007U
CN202218007U CN2011203323707U CN201120332370U CN202218007U CN 202218007 U CN202218007 U CN 202218007U CN 2011203323707 U CN2011203323707 U CN 2011203323707U CN 201120332370 U CN201120332370 U CN 201120332370U CN 202218007 U CN202218007 U CN 202218007U
Authority
CN
China
Prior art keywords
oxide
metal
semiconductor
microprocessor
battery pack
Prior art date
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.)
Expired - Fee Related
Application number
CN2011203323707U
Other languages
Chinese (zh)
Inventor
曾金生
曾振辉
范晓阳
齐界明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fenghuang New Energy (Huizhou) Co., Ltd.
Original Assignee
HUIZHOU HANDPACK BATTERY TECHNOLOGY Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HUIZHOU HANDPACK BATTERY TECHNOLOGY Co Ltd filed Critical HUIZHOU HANDPACK BATTERY TECHNOLOGY Co Ltd
Priority to CN2011203323707U priority Critical patent/CN202218007U/en
Application granted granted Critical
Publication of CN202218007U publication Critical patent/CN202218007U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses a power lithium ion battery protective circuit which includes a microprocessor, a battery pack which is formed by serially connecting five lithium ion batteries, and two MOS tubes. The battery pack is connected with two positive and negative input ports EB+ and EB- via source and drain electrodes of the two MOS tubes. Input ports of the microprocessor are connected with the anodes and cathodes of the batteries in the battery pack via capacitance-resistance elements, i.e. R1 to R5 and C1 to C5. Grids of the two MOS tubes are connected with the microprocessor. One MOS tube is provided with a body diode VD1 and the other MOS tube is provided with a body diode VD2. A resistor R is connected between the microprocessor and the negative input port EB-. A time delay capacitor C is connected between the microprocessor and the cathode of the battery pack. The power lithium ion battery protective circuit can carry out the overcharge, overdischarge, overcurrent, and short circuit protection to each battery at the same time when a plurality of lithium ion batteries in series are in use, thus reducing the production cost and improving the production efficiency.

Description

A kind of protective circuit of power lithium-ion battery
Technical field
The utility model belongs to the electric components technical field, relates to a kind of protective circuit of power lithium-ion battery.
Background technology
When lithium ion battery uses as electrokinetic cell, often need the above lithium ion battery series connection of 5 joints be used, to reach the required voltage of motor.When it being charged with charger, because the quality of every batteries can not be just the same,, just possibly cause inter-electrode short-circuit in case there is a batteries to be in overcharge condition, influence battery capacity, in the life-span, cause battery explosion, peril generation such as on fire.Simultaneously, battery is in to the external loading power supply process, and its voltage can reduce along with power supply process gradually, crosses low even capacity when being given out light fully when cell voltage, possibly cause the permanent damage of battery.In addition, the powered battery electric current is excessive also safety problem can occur.
At present, for the protective circuit of the above lithium ion battery group of 5 joints, all be to adopt a cover to detect decision circuitry to every batteries, adopt a plurality of battery protection chips to be in series, cost is high, poor reliability.Therefore when studying the series connection of multi-section lithium ion battery and using, can be simultaneously to every batteries overcharge, the circuit of overdischarge, overcurrent, short-circuit protection is extremely important.
The utility model content
The utility model technical problem to be solved provides a kind of protective circuit of power lithium-ion battery; When the series connection of multi-section lithium ion battery is used; Can be simultaneously to every batteries overcharge, overdischarge, overcurrent, short-circuit protection, reduce production costs, enhance productivity.
The technical solution of utility model is following:
A kind of protective circuit of power lithium-ion battery comprises battery pack, first metal-oxide-semiconductor and second metal-oxide-semiconductor that microprocessor, 5 joint lithium ion batteries are in series; The positive pole of said battery pack connects the positive output end of power lithium-ion battery, and the negative pole of battery pack connects the source electrode of first metal-oxide-semiconductor, and the drain electrode of first metal-oxide-semiconductor connects the drain electrode of second metal-oxide-semiconductor, and the source electrode of second metal-oxide-semiconductor connects the negative output terminal of power lithium-ion battery; 10 IO ports of said microprocessor in twos one group through 5 cover capacitance-resistance filter branch roads respectively with battery pack in 5 single batteries be connected; The grid of first metal-oxide-semiconductor and second metal-oxide-semiconductor all is connected with microprocessor; First metal-oxide-semiconductor has first body diode, and second metal-oxide-semiconductor has second body diode; The positive pole of first body diode and negative pole connect the source electrode and the drain electrode of first metal-oxide-semiconductor respectively, and the positive pole of second body diode and negative pole connect the source electrode and the drain electrode of second metal-oxide-semiconductor respectively; The negative pole end of microprocessor and battery pack is connected with delay capacitor.
The span of resistance is 300~470 ohm in the said capacitance-resistance filter branch road.
Beneficial effect:
The protective circuit of the utility model power lithium-ion battery, when multi-section lithium ion battery series connection is used, can be simultaneously to every batteries overcharge, overdischarge, overcurrent, short-circuit protection, reduce production costs, enhance productivity.
Below in conjunction with accompanying drawing the utility model is done further to describe in detail.
Description of drawings
Fig. 1 is the protective circuit structured flowchart figure of the utility model power lithium-ion battery.
Embodiment
Below will combine accompanying drawing and specific embodiment that the utility model is explained further details:
As shown in Figure 1, a kind of protective circuit of power lithium-ion battery comprises battery pack, first metal-oxide-semiconductor and second metal-oxide-semiconductor that microprocessor, 5 joint lithium ion batteries are in series; The positive pole of said battery pack connects the positive output end of power lithium-ion battery, and the negative pole of battery pack connects the source electrode of first metal-oxide-semiconductor, and the drain electrode of first metal-oxide-semiconductor connects the drain electrode of second metal-oxide-semiconductor, and the source electrode of second metal-oxide-semiconductor connects the negative output terminal of power lithium-ion battery; 10 IO ports of said microprocessor in twos one group through 5 cover capacitance-resistance filter branch roads respectively with battery pack in 5 single batteries be connected; The grid of first metal-oxide-semiconductor and second metal-oxide-semiconductor all is connected with microprocessor; First metal-oxide-semiconductor has first body diode, and second metal-oxide-semiconductor has second body diode; The positive pole of first body diode and negative pole connect the source electrode and the drain electrode of first metal-oxide-semiconductor respectively, and the positive pole of second body diode and negative pole connect the source electrode and the drain electrode of second metal-oxide-semiconductor respectively; The negative pole end of microprocessor and battery pack is connected with delay capacitor C.
Microprocessor is set and is saved in the internal storage unit battery parameter according to the specifications and models of the battery pack that adopts.When battery was in normal operating conditions, two metal-oxide-semiconductors all were in conducting state, and each batteries in the battery pack can freely be charged and discharge.
Microprocessor uninterruptedly detects each monomer battery voltage; Data in detected data and the memory cell are compared; When microprocessor detects among VCC1~VCC5 one of them voltage and surpasses 4.25V~4.30V is overcharge condition, and 2 pin output low levels of microprocessor are closed second metal-oxide-semiconductor; Cut-out is to the charging of battery pack; Guaranteed that arbitrary joint cell can not damage because of overcharging, because the existence of the body diode VD2 that second metal-oxide-semiconductor carries, battery can discharge through this diode pair external loading.
Detect cell voltage at microprocessor and surpass 4.28V to sending between the shutoff second metal-oxide-semiconductor signal, also have one section delay time, the length of this delay time is determined by C, is made as usually about 1 second, to avoid causing erroneous judgement disconnected because of interference.
In battery discharge procedure; When microprocessor detects that one of them voltage is lower than 2.3V among VCC1~VCC5; Its 1 pin will change no-voltage into by high voltage, make first metal-oxide-semiconductor transfer shutoff to by conducting, thereby cut off discharge loop; Battery can't be discharged to load again, play the over effect.And this moment because the existence of the body diode VD1 that carries of first metal-oxide-semiconductor, charger can charge through this diode pair battery.Detect cell voltage at microprocessor and be lower than 2.3V to sending between the shutoff first metal-oxide-semiconductor signal, one section delay time is also arranged, the length of this delay time is determined by C, is made as usually about 100 milliseconds, to avoid causing erroneous judgement disconnected because of interference.
In addition microprocessor can detect battery pack to the load discharge process in, the loop current that each batteries is corresponding judges whether to take place overcurrent and protection phenomenon; In case take place; Can close end first metal-oxide-semiconductor rapidly, thereby cut off discharge loop, play overcurrent and protective effect.
This protective circuit also is suitable for the battery pack use that the above lithium ion battery of 5 joints is in series.
If require charge protection voltage to surpass 4.30V, the size of adjustable resistor R1~R5 reaches desired condition, and the span of resistance R 1~R5 is 300~470 ohm.

Claims (2)

1. the protective circuit of a power lithium-ion battery is characterized in that, comprises battery pack, first metal-oxide-semiconductor and second metal-oxide-semiconductor that microprocessor, 5 joint lithium ion batteries are in series; The positive pole of said battery pack connects the positive output end of power lithium-ion battery, and the negative pole of battery pack connects the source electrode of first metal-oxide-semiconductor, and the drain electrode of first metal-oxide-semiconductor connects the drain electrode of second metal-oxide-semiconductor, and the source electrode of second metal-oxide-semiconductor connects the negative output terminal of power lithium-ion battery; 10 IO ports of said microprocessor in twos one group through 5 cover capacitance-resistance filter branch roads respectively with battery pack in 5 single batteries be connected; The grid of first metal-oxide-semiconductor and second metal-oxide-semiconductor all is connected with microprocessor; First metal-oxide-semiconductor has first body diode, and second metal-oxide-semiconductor has second body diode; The positive pole of first body diode and negative pole connect the source electrode and the drain electrode of first metal-oxide-semiconductor respectively, and the positive pole of second body diode and negative pole connect the source electrode and the drain electrode of second metal-oxide-semiconductor respectively; The negative pole end of microprocessor and battery pack is connected with delay capacitor.
2. the protective circuit of power lithium-ion battery as claimed in claim 1 is characterized in that, the span of resistance is 300~470 ohm in the said capacitance-resistance filter branch road.
CN2011203323707U 2011-09-05 2011-09-05 Power lithium ion battery protective circuit Expired - Fee Related CN202218007U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011203323707U CN202218007U (en) 2011-09-05 2011-09-05 Power lithium ion battery protective circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011203323707U CN202218007U (en) 2011-09-05 2011-09-05 Power lithium ion battery protective circuit

Publications (1)

Publication Number Publication Date
CN202218007U true CN202218007U (en) 2012-05-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011203323707U Expired - Fee Related CN202218007U (en) 2011-09-05 2011-09-05 Power lithium ion battery protective circuit

Country Status (1)

Country Link
CN (1) CN202218007U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103022981A (en) * 2012-12-28 2013-04-03 中颖电子股份有限公司 Protective circuit for cascade of multiple battery strings
CN106877434A (en) * 2017-03-13 2017-06-20 四川力垦锂动力科技有限公司 A kind of battery charging plant

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103022981A (en) * 2012-12-28 2013-04-03 中颖电子股份有限公司 Protective circuit for cascade of multiple battery strings
CN103022981B (en) * 2012-12-28 2014-09-03 中颖电子股份有限公司 Protective circuit for cascade of multiple battery strings
CN106877434A (en) * 2017-03-13 2017-06-20 四川力垦锂动力科技有限公司 A kind of battery charging plant

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C56 Change in the name or address of the patentee

Owner name: FENGHUANG NEW ENERGY (HUIZHOU) CO., LTD.

Free format text: FORMER NAME: HUIZHOU HANPAI BATTERY TECHNOLOGY CO., LTD.

CP01 Change in the name or title of a patent holder

Address after: 516211 Guangdong District of Huiyang city in Huizhou province long autumn street gurabardha Tang Jing group ZILONG Industrial Park

Patentee after: Fenghuang New Energy (Huizhou) Co., Ltd.

Address before: 516211 Guangdong District of Huiyang city in Huizhou province long autumn street gurabardha Tang Jing group ZILONG Industrial Park

Patentee before: HUIZHOU HANDPACK BATTERY TECHNOLOGY CO., LTD.

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120509

Termination date: 20160905