CN202121027U - Battery with high-accuracy current protection circuit - Google Patents
Battery with high-accuracy current protection circuit Download PDFInfo
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- CN202121027U CN202121027U CN2011202449958U CN201120244995U CN202121027U CN 202121027 U CN202121027 U CN 202121027U CN 2011202449958 U CN2011202449958 U CN 2011202449958U CN 201120244995 U CN201120244995 U CN 201120244995U CN 202121027 U CN202121027 U CN 202121027U
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- battery
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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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model relates to a battery with a high-accuracy current protection circuit, which mainly comprises a battery cell and a battery protection IC (Integrated Circuit). The battery cell and the battery protection IC are respectively connected between a positive electrode output terminal and a negative electrode output terminal; the battery cell is connected in series with a secondary protection element, a current detection resistor R3, a field effect tube Q1 and a field effect tube Q2; a VDD (Voltage Drain) pin of the battery protection IC is connected with a positive electrode of the battery cell through the resistor R1; and the VDD pin of the battery protection IC is connected between the secondary protection element and the current detection resistor R3; a VSS (Voltage Sources) pin and a CS (Chip Selection) pin of the battery protection IC are respectively connected with the two ends of the current detection resistor R3; the CS pin is connected with the source electrode of the field effect tube Q1; and a capacitor C2 is connected between the positive electrode output terminal and the negative electrode output terminal. The battery with the high-accuracy current protection circuit has the advantages of capability that the accuracy of the overcurrent protection is increased by 30%, and the practicability and expandability of the circuit are higher.
Description
Technical field
The utility model relates to a kind of battery, particularly relates to a kind of battery that has the high-precision current protective circuit.
Background technology
Along with scientific and technological progress and social development; It is more and more universal to resemble portable sets such as mobile phone, notebook computer, MP3 player, PDA, handheld device, DV; Having many in this series products is to adopt the lithium ion battery power supply, and because the characteristic of lithium ion battery is different with other rechargeable battery, inside all has a circuit board usually; Many people do not understand the effect of this circuit, and this paper will set forth the characteristics and the protective circuit operation principle thereof of lithium ion battery.
Lithium battery is divided into two types of primary cell and secondary cells; In the lower portable type electronic product of part power consumption, mainly use non-rechargeabel disposable lithium-battery at present; In the bigger electronic product of power consumption such as notebook computer, mobile phone, PDA, digital camera, then use chargeable secondary cell, i.e. lithium ion battery.
Compare with Ni-MH battery with NI-G, lithium ion battery possesses following advantage:
1. voltage is high, and the voltage of single-unit lithium ion battery can reach 3.6V, far above the 1.2V voltage of NI-G and Ni-MH battery;
2. capacity density is big, and its capacity density is Ni-MH battery or nickel-cadmium cell 1.5-2.5 a times;
3. retention of charge strong (being that self discharge is little) is also very little at back for a long time its capacitance loss of placement;
Life-span long, normally use its cycle life can reach more than 500 times;
5. there is not memory effect, will dump energy emptying before charging, easy to use;
Because the chemical characteristic of lithium ion battery, in normal use, the chemical positive reaction that electric energy and chemical energy transform is each other carried out in its inside; But under certain conditions, as it is overcharged, overdischarge and overcurrent will cause inside battery generation chemical side reactions, after this side reaction aggravation; Can have a strong impact on the performance and the useful life of battery; And possibly produce a large amount of gases, make cell internal pressure increase after-explosion rapidly and cause safety problem, so all lithium ion batteries all need a protective circuit; Be used for the charge and discharge state of battery is effectively monitored, and turn-off the charge and discharge loop under certain conditions and battery is damaged preventing.
At present, the scheme of the current protecting circuit of reason battery commonly used generally is under big current conditions, and protection IC gathers the voltage signal that produces because of the Mosfet internal resistance, and protection IC makes and judges whether to cut off circuit, thereby realizes the overcurrent protection of battery circuit.Because the Mosfet internal resistance is unstable; And individual difference is big, and receives the external environment influence easily, so very poor with the overcurrent protection value consistency that this current protecting circuit drew; Wide ranges; Over-current protection point is unstable. and be prone to cause the battery overcurrent protection in advance or postpone, influence the use of battery, even can cause electric core possible permanent damage.
In addition, at the lithium battery of above-mentioned mode current protective circuit, if protection IC and Mosfet fix, then overcurrent protection value scope also will be fixed, and be unfavorable for the expansion of circuit.Be not easy to product and carry out the autgmentability improvement.
Prior art has following shortcoming:
1. the overcurrent protection value consistency of current foldback circuit is poor;
2. protection range is wide, and over-current protection point is unstable;
3. be unfavorable for the circuit expansion;
Lacking a kind of lithium battery that can solve in the market descends because of the over-current protection point instability causes properties of product; And can utilize identical protection IC; The logical value of revising the inspection leakage resistance; Can realize different overcurrent protection functions, circuit practical, the lithium battery of the high-precision current protective circuit that autgmentability is superior.
The utility model content
The utility model technical problem to be solved is that the overcurrent protection value consistency of present employed lithium battery current foldback circuit is poor; Protection range is wide; Over-current protection point is unstable, and is unfavorable for shortcoming such as circuit expansion, designs a kind of battery that has the high-precision current protective circuit again; Its primary structure comprises electric core Cell, battery protection ic, is connected in the sub-Pack+ of cathode output end and the sub-Pack-of cathode output end of the positive and negative electrode of electric core Cell in addition respectively.Be in series with second class protection original paper, inspection flow resistor R between described electric core Cell negative pole and the sub-Pack-of cathode output end successively
3With FET Q
1, FET Q
2Said inspection flow resistor R
3With FET Q
1Source electrode connect FET Q
1Drain electrode and FET Q
2Drain electrode link FET Q
1With FET Q
2Form the grid of a MOSFET circuit respectively, MOSFET plays on-off action in circuit, is controlling the conducting and the shutoff of charge circuit and discharge loop respectively.The CS pin of control IC is the current monitoring pin.The VDD pin of described battery protection ic passes through resistor R
1Connect with the positive level of electric core Cell, the VDD pin of battery protection ic passes through capacitor C simultaneously
1Be connected in second class protection original paper and inspection flow resistor R
3Between; The VSS of battery protection ic, CS pin are connected in inspection flow resistor R respectively
3Two ends, the CS pin of battery protection ic and FET Q
1Source electrode connect; The CO of battery protection ic, DO pin respectively with FET Q
1, Q
2Grid connect; The V-pin of battery protection ic passes through resistor R
2With FET Q
2Source electrode connect; Be connected with capacitor C between sub-Pack+ of cathode output end and the sub-Pack-of cathode output end
2
Described second class protection original paper is for recover fuse PTC certainly.
This circuit has additives for overcharge protection, over, overcurrent protection and short-circuit protection function, and its principle Analysis is following:
1, normal condition
" CO " of battery protection ic and " DO " pin output HIGH voltage all in the circuit under normal condition; Two MOSFET are in conducting state; Battery can freely charge and discharge; Because the conduction impedance of MOSFET is very little, usually less than 30 milliohms, so its conducting resistance is very little to the performance impact of circuit.
The current sinking of protective circuit is a μ A level under this state, usually less than 7 μ A.
2, additives for overcharge protection
The charging modes that lithium ion battery requires is a constant current/constant voltage, at the charging initial stage, is constant current charge; Along with charging process, voltage can rise to 4.2V (different according to positive electrode, the battery request constant voltage value that has is 4.1V); Transfer constant voltage charge to, more and more littler until electric current.
Battery is in being recharged process; If charger circuit is out of hand; Can make cell voltage surpass 4.2V continued constant current charge, this moment, cell voltage still can continue to rise, when cell voltage is recharged when surpassing 4.3V; The chemical side reactions of battery will be aggravated, and can cause the battery damage or safety problem occur.
In having the battery of protective circuit; When the control battery protection ic detects cell voltage and reaches 4.28V (this value determines that by the control battery protection ic different battery protection ics has different values), its " CO " pin will change no-voltage into by high voltage; Make Q2 transfer shutoff to by conducting; Thereby cut off charge circuit, charger can't be charged to battery again, played the additives for overcharge protection effect.And this moment because the existence of the body diode VD2 that carries of Q2, battery can discharge through this diode pair external loading.
Detect cell voltage at the control battery protection ic and surpass 4.28V and turn-off between the Q2 signal to sending, also have one section delay time, this delay time is usually by the decision of control battery protection ic, to avoid causing erroneous judgement disconnected because of interference.
3, over
Battery is in to the external loading discharge process, and its voltage can reduce along with discharge process gradually, and when cell voltage was reduced to 2.5V, its capacity was given out light fully, if let this moment battery continue to load discharge, with the permanent damage that causes battery.
In battery discharge procedure, when the control battery protection ic detects cell voltage and is lower than 2.3V (this value determines that by control IC different battery protection ics has different values), its " DO " pin will change no-voltage into by high voltage, make Q
1Transfer shutoff to by conducting, thereby cut off discharge loop, battery can't be discharged to load again, play the over effect.And this moment is because Q
1The existence of the body diode that carries, charger can charge through this diode pair battery.
Because cell voltage can not reduce again under the over state, therefore require the current sinking of protective circuit minimum, control battery protection ic and can get into low power consumpting state this moment, and whole protecting circuit power consumption meeting is less than 0.1 μ A.
Detect cell voltage in control IC and be lower than 2.3V to sending shutoff Q
1Between the signal, one section delay time is arranged also, this delay time is usually by the control IC decision, to avoid causing erroneous judgement disconnected because of interference.
4, overcurrent protection
Because the chemical characteristic of lithium ion battery, battery production producer has stipulated that its discharging current maximum can not surpass 2C (C=battery capacity/hour), when battery during above the 2C current discharge, will cause the permanent damage of battery or safety problem occur.
Battery is in to load regular picture process, and discharging current is at process inspection leakage resistance R
3The time, can produce a voltage, this magnitude of voltage U=I*R3 at its two ends; " V-" pin on the control IC detects this magnitude of voltage, if load because of certain reason causes unusually, makes loop current increase; (this value is determined by control IC to making U＞0.1V when loop current is big; Different IC has different values) time, its " DO " pin will change no-voltage into by high voltage, make Q
1Transfer shutoff to by conducting, thereby cut off discharge loop, making in the loop electric current is zero, plays the overcurrent protection effect.
Detecting overcurrent at the control battery protection ic takes place to turn-off Q to sending
1Between the signal, one section delay time is arranged also, this delay time is usually by the decision of control battery protection ic, to avoid causing erroneous judgement disconnected because of interference.
Part is controlled battery protection ic and is also had charging overcurrent guarantor function, and the principle above is similar, and wherein the value of U is a negative value, and " CO " pin will change no-voltage into by high voltage during protection, make Q
2Transfer shutoff to by conducting, thereby cut off discharge loop.
Can know that in above-mentioned control procedure its overcurrent detected value size not only depends on the controlling value of controlling battery protection ic, also depends on R
3Resistance, work as R
3Resistance when big more, to same control battery protection ic, its overcurrent protection value is more little.
5, short-circuit protection
Battery is in to the load discharge process; If loop current greatly when making U＞0.9V (this value determines that by the control battery protection ic different battery protection ics has different values), is controlled battery protection ic and then is judged as load short circuits; Its " DO " pin will change no-voltage into by high voltage rapidly, makes Q
1Transfer shutoff to by conducting, thereby cut off discharge loop, play the short-circuit protection effect.The delay time of short-circuit protection is extremely short, usually less than 1000 microseconds.Its operation principle and overcurrent protection are similar, and just determination methods is different, and the protection delay time is also different.
The utility model compared with prior art, the precision of overcurrent protection can improve 30%, the practicality of circuit, autgmentability is stronger.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model embodiment one.
Embodiment
Embodiment one: as shown in Figure 1, the structure of present embodiment comprises electric core Cell, battery protection ic, is connected in the sub-Pack+ of cathode output end and the sub-Pack-of cathode output end of the positive and negative electrode of electric core Cell in addition respectively.Be in series with second class protection original paper, inspection flow resistor R between described electric core Cell negative pole and the sub-Pack-of cathode output end successively
3With FET Q
1, FET Q
2Said inspection flow resistor R
3With FET Q
1Source electrode connect FET Q
1Drain electrode and FET Q
2Drain electrode link FET Q
1With FET Q
2Form the grid of a MOSFET circuit respectively, MOSFET plays on-off action in circuit, is controlling the conducting and the shutoff of charge circuit and discharge loop respectively.The CS pin of control IC is the current monitoring pin.The VDD pin of described battery protection ic passes through resistor R
1Connect with the positive level of electric core Cell, the VDD pin of battery protection ic passes through capacitor C simultaneously
1Be connected in second class protection original paper and inspection flow resistor R
3Between; The VSS of battery protection ic, CS pin are connected in inspection flow resistor R respectively
3Two ends, the CS pin of battery protection ic and FET Q
1Source electrode connect; The CO of battery protection ic, DO pin respectively with FET Q
1, Q
2Grid connect; The V-pin of battery protection ic passes through resistor R
2With FET Q
2Source electrode connect; Be connected with capacitor C between sub-Pack+ of cathode output end and the sub-Pack-of cathode output end
2
Described second class protection original paper is for recover fuse PTC certainly.
Claims (2)
1. battery that has the high-precision current protective circuit; Its primary structure comprises electric core Cell, battery protection ic and is connected in the sub-Pack+ of cathode output end and the sub-Pack-of cathode output end of the positive and negative electrode of electric core Cell respectively, it is characterized in that being in series with successively between described electric core Cell negative pole and the sub-Pack-of cathode output end second class protection original paper, inspection flow resistor R
3With FET Q
1, Q
2Said inspection flow resistor R
3With FET Q
1Source electrode connect FET Q
1Drain electrode and FET Q
2Drain electrode link; The VDD pin of described battery protection ic passes through resistor R
1Connect with the positive level of electric core Cell, the VDD pin of battery protection ic passes through capacitor C simultaneously
1Be connected in second class protection original paper and inspection flow resistor R
3Between; The VSS of battery protection ic, CS pin are connected in inspection flow resistor R respectively
3Two ends, the CS pin of battery protection ic and FET Q
1Source electrode connect; The CO of battery protection ic, DO pin respectively with FET Q
1, Q
2Grid connect; The V-pin of battery protection ic passes through resistor R
1With FET Q
2Source electrode connect; Be connected with capacitor C between sub-Pack+ of cathode output end and the sub-Pack-of cathode output end
2
2. the battery that has the high-precision current protective circuit according to claim 1 is characterized in that described second class protection original paper is for recover fuse PTC certainly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202449958U CN202121027U (en) | 2011-07-12 | 2011-07-12 | Battery with high-accuracy current protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202449958U CN202121027U (en) | 2011-07-12 | 2011-07-12 | Battery with high-accuracy current protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202121027U true CN202121027U (en) | 2012-01-18 |
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ID=45462066
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202449958U Expired - Lifetime CN202121027U (en) | 2011-07-12 | 2011-07-12 | Battery with high-accuracy current protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202121027U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104170120A (en) * | 2013-03-11 | 2014-11-26 | 日立麦克赛尔株式会社 | Lithium secondary cell pack, as well as electronic device, charging system, and charging method using said pack |
| CN104218633A (en) * | 2013-06-01 | 2014-12-17 | 快捷半导体(苏州)有限公司 | System for Battery Management and Protection |
| CN105048416A (en) * | 2015-07-20 | 2015-11-11 | 惠州Tcl移动通信有限公司 | Self-protection circuit and method of battery |
| CN106711957A (en) * | 2015-07-27 | 2017-05-24 | 长城汽车股份有限公司 | Lithium battery monomer protection circuit, vehicle-mounted power supply and automobile |
| CN108153185A (en) * | 2017-12-06 | 2018-06-12 | 欣旺达电子股份有限公司 | Programmable Li battery protection IC |
| CN109546626A (en) * | 2018-12-27 | 2019-03-29 | 北斗天地股份有限公司山东分公司 | A kind of battery and its protection circuit, mine anti-explosion smart phone |
| CN110571487A (en) * | 2019-09-30 | 2019-12-13 | 深圳市道通科技股份有限公司 | battery and automobile diagnosis panel |
-
2011
- 2011-07-12 CN CN2011202449958U patent/CN202121027U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104170120A (en) * | 2013-03-11 | 2014-11-26 | 日立麦克赛尔株式会社 | Lithium secondary cell pack, as well as electronic device, charging system, and charging method using said pack |
| CN104170120B (en) * | 2013-03-11 | 2016-08-24 | 日立麦克赛尔株式会社 | Lithium secondary battery and employ its electronic equipment, charging system and charging method |
| CN104218633A (en) * | 2013-06-01 | 2014-12-17 | 快捷半导体(苏州)有限公司 | System for Battery Management and Protection |
| CN104218633B (en) * | 2013-06-01 | 2017-01-04 | 快捷半导体(苏州)有限公司 | Battery management and protection system |
| CN105048416A (en) * | 2015-07-20 | 2015-11-11 | 惠州Tcl移动通信有限公司 | Self-protection circuit and method of battery |
| CN106711957A (en) * | 2015-07-27 | 2017-05-24 | 长城汽车股份有限公司 | Lithium battery monomer protection circuit, vehicle-mounted power supply and automobile |
| CN106711957B (en) * | 2015-07-27 | 2019-02-19 | 长城汽车股份有限公司 | A kind of protection circuit, vehicle power supply and the automobile of lithium battery monomer |
| CN108153185A (en) * | 2017-12-06 | 2018-06-12 | 欣旺达电子股份有限公司 | Programmable Li battery protection IC |
| CN109546626A (en) * | 2018-12-27 | 2019-03-29 | 北斗天地股份有限公司山东分公司 | A kind of battery and its protection circuit, mine anti-explosion smart phone |
| CN110571487A (en) * | 2019-09-30 | 2019-12-13 | 深圳市道通科技股份有限公司 | battery and automobile diagnosis panel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151130 Address after: 510663, Guangdong, Guangzhou hi tech Industrial Development Zone, science, South Road, No. 39 cloud three (1), the first floor, two, three Patentee after: GUANGZHOU LIANGSHI COMMUNICATION APPLIANCE CO., LTD. Address before: 510663, science and Technology Industrial Development Zone, Guangzhou, Guangdong Province, No. three, No. 39, Cloud Road, South City, Guangzhou Patentee before: Guangzhou Mingmei Electronics Co., Ltd. |
|
| CP03 | Change of name, title or address |
Address after: 510670 Guangzhou High-tech Industrial Development Zone Science City, Guangdong Province, South Yun Road 39 (1) Building, the first, second and third floors Patentee after: Guangzhou new energy Co. Ltd. Address before: 510663 First, Second and Third Floors of Building 39 (1) Nanyun Third Road, Guangzhou High-tech Industrial Development Zone, Guangdong Province Patentee before: GUANGZHOU LIANGSHI COMMUNICATION APPLIANCE CO., LTD. |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 510000 the first floor, second floor and third floor of Building 1, No.39, Yunsan Road, Science City, Guangzhou high tech Industrial Development Zone, Guangdong Province Patentee after: Guangzhou Mingmei new energy Co., Ltd Address before: 510670 Guangzhou High-tech Industrial Development Zone Science City, Guangdong Province, South Yun Road 39 (1) Building, the first, second and third floors Patentee before: GUANGZHOU TWS NEW ENERGY Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120118 |
|
| CX01 | Expiry of patent term |