CN105515096A - Battery protection circuit and system thereof - Google Patents

Battery protection circuit and system thereof Download PDF

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Publication number
CN105515096A
CN105515096A CN201510901845.2A CN201510901845A CN105515096A CN 105515096 A CN105515096 A CN 105515096A CN 201510901845 A CN201510901845 A CN 201510901845A CN 105515096 A CN105515096 A CN 105515096A
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CN
China
Prior art keywords
resistance
battery
chip
protection
overcurrent
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.)
Pending
Application number
CN201510901845.2A
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Chinese (zh)
Inventor
尹航
张勇
王钊
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.)
Wuxi Zhonggan Microelectronics Co Ltd
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Wuxi Zhonggan Microelectronics 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 Wuxi Zhonggan Microelectronics Co Ltd filed Critical Wuxi Zhonggan Microelectronics Co Ltd
Priority to CN201510901845.2A priority Critical patent/CN105515096A/en
Publication of CN105515096A publication Critical patent/CN105515096A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • 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)
  • Protection Of Static Devices (AREA)

Abstract

The present invention provides a battery protection circuit and a system thereof. The circuit comprises a battery protection chip and a chip peripheral circuit. The chip is provided with an overcurrent detection pin CS. The chip peripheral circuit is provided with a switch tube and comprises a first resistor (Ra), a second resistor (Rb), and a third resistor (RSENSE). One end of the first resistor (Ra) is connected to one end of the second resistor (Rb) and is connected to the overcurrent detection pin CS of the chip. The other end of the first resistor (Ra) is connected to one end of the third resistor (RSENSE), and the other end of the second resistor (Rb) is connected to the other end of the third resistor (RSENSE). The internal overcurrent protection threshold of the battery protection chip is VEDI. When the voltage of the overcurrent detection pin CS is higher than the overcurrent protection threshold VEDI, the battery protection chip triggers a protection action. Through the mediation of a battery protection threshold, while the safety is ensured, the potential of the battery is further explored.

Description

A kind of battery protecting circuit and system thereof
Technical field
The present invention relates to the integrated circuit (IC) design technical field in microelectronic, particularly a kind of battery protecting circuit and system thereof.
Background technology
In battery protection field, along with battery capacity improves, battery core series connection number is increasing, and safety problem receives much attention; Associated, require day by day to improve to battery current overcurrent protection precision and defencive function.Be the power resistor of high accuracy low resistance of connecting on battery charging and discharging path for the high-precision implementation method of current detecting in current protection field.Implement protection act when protect IC detects when this ohmically pressure drop exceedes corresponding protection threshold value, reach the switch preventing from controlling discharge and recharge and burn out the object with extending battery life.
But, because the threshold value and used chip threshold value that may occur needs in practical application is inconsistent, cause appearing as guarantee fail safe, and the situation of sacrificing protection plate and battery potentiality.
In addition, for the switching device controlling battery charging and discharging electric current, excess temperature burn out be its electric current excessive time the major reason damaged; And be difficult to the temperature information closely obtaining switching tube due to protect IC, be difficult to suitably regulate current protection threshold value according to the actual temperature of switching tube.In order to safety, during baffle design, need again overcurrent protection threshold value enough low, to ensure that battery charging and discharging switching tube is not burned under most high workload environment, so, equals the ability sacrificing cell output current under usual working temperature.
Summary of the invention
The object of the invention is the defect for prior art, a kind of battery protecting circuit and system thereof are provided.By with power resistor parallel resistance, and the resistance of regulating resistance, makes battery current protect threshold value to change in rational scope, thus excavate battery potentiality further while guarantee battery security; And resistance is set to the resistance of temperature coefficient, make battery current protect threshold value can make useful change along with the temperature of cell switch pipe, excavate battery potentiality further.
First aspect present invention provides a kind of battery protecting circuit, comprises battery protection chip and chip periphery circuit; Chip is provided with overcurrent and detects pin CS; Described chip periphery circuit comprises the first resistance Ra, the second resistance Rb and the 3rd resistance R sENSE; Wherein, one end of described first resistance Ra is connected with one end of described second resistance Rb, and the overcurrent accessing described chip detects pin CS; The other end of described first resistance Ra and described 3rd resistance R sENSEone end connect, and the other end of described second resistance Rb and described 3rd resistance R sENSEthe other end connect; The built-in overcurrent protection threshold value of described battery protection chip is V eDI; The voltage of pin CS is detected higher than overcurrent protection threshold value V in overcurrent eDItime, the action of described battery protection chip trigger protection.
Preferably, described battery protection chip is according to overcurrent protection threshold value V eDIcalculate and flow through described 3rd resistance R sENSEcurrent threshold when flowing through described 3rd resistance R sENSEelectric current exceed current threshold I eDItime, the action of described battery protection chip trigger protection.
Preferably, described first resistance Ra is the resistance of negative temperature coefficient, and is arranged on by described first resistance Ra on the position of described switching tube, makes coefficient decline with the rising of temperature.
Preferably, described second resistance Rb is the resistance of positive temperature coefficient, and is arranged on by described second resistance Rb on the position of described switching tube, makes coefficient decline with the rising of temperature.
Preferably, described first resistance Ra is the resistance of negative temperature coefficient, and the second resistance Rb is the resistance of positive temperature coefficient, and is arranged on by described first resistance Ra and the second resistance Rb on the position of described switching tube, makes coefficient decline with the rising of temperature.
Preferably, according to the different requirements in practical application, battery current being protected to threshold value, regulate the resistance of described first resistance Ra and the second resistance Rb, and then adjustment factor
Second aspect present invention provides a kind of battery protection system, comprises battery and above-mentioned battery protecting circuit.
The present invention by with power resistor parallel resistance, and the resistance of regulating resistance, can realize protecting threshold value more accurately; And resistance is set to the resistance of temperature coefficient, make overcurrent protection threshold value have feature with battery charging and discharging switching tube variations in temperature, while guarantee fail safe, excavate battery potentiality further.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the battery protecting circuit schematic diagram do not optimized of prior art;
The battery protecting circuit schematic diagram of the adjustment containing battery current protection threshold value that Fig. 2 provides for the embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.
The embodiment of the present invention by with power resistor parallel resistance, and the resistance of regulating resistance, makes battery current protect threshold value to change in rational scope, thus excavate battery potentiality further while guarantee battery security; And resistance is set to the resistance of temperature coefficient, make battery current protect threshold value can make useful change along with the temperature of cell switch pipe, excavate battery potentiality further.
Fig. 1 is the battery protecting circuit schematic diagram do not optimized of prior art.As shown in the figure, for Mitsumi product MM3474 realizes carrying out battery protection to the lithium battery of battery core V1, V2, V3, V4, V5 being example.Battery protecting circuit is divided into battery protection chip and chip periphery circuit.
Battery protection chip is provided with the pins such as charging controls output pin OV, control of discharge output pin DCHG, charging detects pin V-, overcurrent detection pin CS, additives for overcharge protection signal input tube pin SOC, over signal input tube pin SDC, voltage detecting pin V1, V2, V3, V4, V5 and ground pin VSS (VSS1 and VSS2 in Fig. 1).
In chip periphery circuit, be provided with power resistor R sENSE, charging controlling filed effect transistor (ChargecontrolFieldeffecttransistor) M1 and control of discharge field-effect transistor (DischargecontrolFieldeffecttransistor) M2.Charging controlling filed effect transistor M1 and control of discharge field effect transistor M 2 are switching tube, power resistor R sENSEresistance is 5m Ω.Overcurrent protection threshold voltage V eDIfor the voltage at power resistor two ends, V in a battery core protect IC eDIfor definite value, the protection threshold value of switching current is protect IC is according to the voltage V of CS pin cScarry out electric current judgement, work as V cSexceed the overcurrent protection threshold value V that protect IC is built-in eDI, the action of chip trigger protection.
The battery protecting circuit schematic diagram of the adjustment containing battery current protection threshold value that Fig. 2 provides for the embodiment of the present invention.This circuit comprises battery protection chip MM3474 (1) and chip periphery circuit; Chip is provided with overcurrent and detects pin CS.
Particularly, chip periphery circuit comprises the first resistance Ra, the second resistance Rb and the 3rd resistance R sENSE; Wherein, one end of described first resistance Ra is connected with one end of described second resistance Rb, and the overcurrent accessing described chip detects pin CS; The other end of described first resistance Ra and described 3rd resistance R sENSEone end connect, and the other end of described second resistance Rb and described 3rd resistance R sENSEthe other end connect; The built-in overcurrent protection threshold value of described battery protection chip is V eDI; The voltage of pin CS is detected higher than overcurrent protection threshold value V in overcurrent eDItime, the action of described battery protection chip trigger protection.
The built-in overcurrent protection threshold value of battery protection chip is V eDI; Battery protection chip is according to overcurrent protection threshold value V eDIcalculate and flow through described 3rd resistance R sENSEcurrent threshold I eDI, when flowing through described 3rd resistance R sENSEelectric current exceed current threshold I eDItime, the action of described battery protection chip trigger protection.
As Fig. 2, Ra, Rb resistance are easy to choose the order of magnitude and exceed R far away sENSEresistance, its parallel shunt affect in actual applications can accomplish that protection precision allows standard in.Citing Ra, Rb series resistance is 1K Ω, R sENSEresistance 5m Ω, so increases the electric current that Ra, Rb bypass resistance string flows through and only accounts for R sENSEresistor current 200,000/.Thus in the calculation Ra, Rb resistance crosstalk stream is ignored, it is feasible for only counting its partial pressure properties.
In Fig. 2, in circuit, CS port voltage is for flowing through R sENSEthe dividing potential drop of voltage on Ra, Rb resistance string of the electric current generation of resistance.When CS port voltage reaches V eDItime, corresponding flows through R sENSEthe electric current of resistance is exactly the current protection threshold value I of Fig. 2 circuit eDI.If V sENCEfor R sENSEohmically pressure drop, because the electric current flowing through Rb equals to flow through Ra+Rb resistance string obtain electric current; So have V R S E N C E R a + R b = V E D I R b , Namely V R S E N C E = ( R a + R b ) · V E D I R b .
Now flow through R sENCEthe electric current of resistance is because flow through R sENCEthe amount of current level of resistance far exceedes the electric current flowing through Ra+Rb resistance string, so protection threshold value engineering can being recognized the electric current of Fig. 2 is I E D I = R a + R b R b · V E D I R S E N S E .
In the application of reality, according to the requirement of user to the protection threshold value of electric current, Ra, Rb resistance can be regulated, can by coefficient adjust flexibly in scope more than 1.Therefore, as long as the protective current that the protect IC protection threshold value chosen is converted out is less than the protective current of protect IC needs, just can by increasing bypass divider resistance string Ra, Rb carries out the accurate setting of current protection threshold value.
Particularly, the first resistance Ra can be set to the resistance of negative temperature coefficient, and place near switching tube; Make coefficient decline with the rising of temperature.Now, battery current protection threshold value also will make useful change according to switch temperature.That is, switch temperature is higher, and current protection threshold value is lower.
Particularly, as another execution mode of the embodiment of the present invention, also the second resistance Rb can be set to the resistance of positive temperature coefficient, and place near switching tube; Make coefficient decline with the rising of temperature.
Particularly, as another execution mode of the embodiment of the present invention, the first resistance Ra can be set to the resistance of negative temperature coefficient and the second resistance Rb be set to the resistance of positive temperature coefficient, and the first resistance Ra and the second resistance Rb is placed near switching tube; Make coefficient decline with the rising of temperature.
The present invention by with power resistor parallel resistance, and the resistance of respectively regulating resistance, can realize protecting threshold value more accurately; And resistance is set to the resistance of temperature coefficient, make overcurrent protection threshold value have feature with battery charging and discharging switching tube variations in temperature, while guarantee fail safe, excavate battery potentiality further.
Professional should recognize further, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with electronic hardware, computer software or the combination of the two, in order to the interchangeability of hardware and software is clearly described, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (7)

1. a battery protecting circuit, comprises battery protection chip and chip periphery circuit; Battery protection chip is provided with overcurrent and detects pin CS; Chip periphery circuit is provided with switching tube; It is characterized in that, described chip periphery circuit comprises the first resistance (Ra), the second resistance (Rb) and the 3rd resistance (R sENSE); Wherein, one end of described first resistance (Ra) is connected with one end of described second resistance (Rb), and the overcurrent accessing described chip detects pin CS; The other end of described first resistance (Ra) and described 3rd resistance (R sENSE) one end connect, and the other end of described second resistance (Rb) and described 3rd resistance (R sENSE) the other end connect;
The built-in overcurrent protection threshold value of described battery protection chip is V eDI; The voltage of pin CS is detected higher than overcurrent protection threshold value V in overcurrent eDItime, the action of described battery protection chip trigger protection.
2. circuit according to claim 1, is characterized in that, described battery protection chip is according to overcurrent protection threshold value V eDIcalculate and flow through described 3rd resistance (R sENSE) current threshold when flowing through described 3rd resistance (R sENSE) electric current exceed current threshold I eDItime, the action of described battery protection chip trigger protection.
3. circuit according to claim 1, is characterized in that, the resistance that described first resistance (Ra) is negative temperature coefficient, and described first resistance (Ra) is arranged on the position of described switching tube, makes coefficient decline with the rising of temperature.
4. circuit according to claim 1, is characterized in that, the resistance that described second resistance (Rb) is positive temperature coefficient, and described second resistance (Rb) is arranged on the position of described switching tube, makes coefficient decline with the rising of temperature.
5. circuit according to claim 1, it is characterized in that, the resistance that described first resistance (Ra) is negative temperature coefficient, the resistance that second resistance (Rb) is positive temperature coefficient, and described first resistance (Ra) and the second resistance (Rb) are arranged on the position of described switching tube, make coefficient decline with the rising of temperature.
6. circuit according to claim 2, is characterized in that, according to the different requirements in practical application, battery current being protected to threshold value, regulates the resistance of described first resistance (Ra) and the second resistance (Rb), and then adjustment factor
7. a battery protection system, is characterized in that, comprise battery and as arbitrary in claim 1-6 as described in battery protecting circuit.
CN201510901845.2A 2015-12-08 2015-12-08 Battery protection circuit and system thereof Pending CN105515096A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510901845.2A CN105515096A (en) 2015-12-08 2015-12-08 Battery protection circuit and system thereof

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Application Number Priority Date Filing Date Title
CN201510901845.2A CN105515096A (en) 2015-12-08 2015-12-08 Battery protection circuit and system thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107803349A (en) * 2017-11-27 2018-03-16 安徽文尧智能光电科技有限公司 A kind of PWM adjusting control circuits of corn color selector
CN110380474A (en) * 2019-07-16 2019-10-25 深圳市菱奇半导体有限公司 Battery protection controller and battery charge/discharge protection circuit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002528022A (en) * 1998-10-05 2002-08-27 クゥアルコム・インコーポレイテッド Battery protection circuit
CN2768266Y (en) * 2004-11-15 2006-03-29 比亚迪股份有限公司 Overcurrent protection circuit
CN201629868U (en) * 2010-03-04 2010-11-10 李志成 Energy-saving electromagnetic heating device
CN201877808U (en) * 2010-09-13 2011-06-22 惠州市蓝微电子有限公司 Battery cell protective circuit of multi-power lithium battery
CN103647258A (en) * 2013-11-27 2014-03-19 无锡中星微电子有限公司 Battery protection-used chip cascade structure
CN205319690U (en) * 2015-12-08 2016-06-15 无锡中感微电子股份有限公司 Battery protection circuit and system thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002528022A (en) * 1998-10-05 2002-08-27 クゥアルコム・インコーポレイテッド Battery protection circuit
CN2768266Y (en) * 2004-11-15 2006-03-29 比亚迪股份有限公司 Overcurrent protection circuit
CN201629868U (en) * 2010-03-04 2010-11-10 李志成 Energy-saving electromagnetic heating device
CN201877808U (en) * 2010-09-13 2011-06-22 惠州市蓝微电子有限公司 Battery cell protective circuit of multi-power lithium battery
CN103647258A (en) * 2013-11-27 2014-03-19 无锡中星微电子有限公司 Battery protection-used chip cascade structure
CN205319690U (en) * 2015-12-08 2016-06-15 无锡中感微电子股份有限公司 Battery protection circuit and system thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107803349A (en) * 2017-11-27 2018-03-16 安徽文尧智能光电科技有限公司 A kind of PWM adjusting control circuits of corn color selector
CN110380474A (en) * 2019-07-16 2019-10-25 深圳市菱奇半导体有限公司 Battery protection controller and battery charge/discharge protection circuit
WO2021008357A1 (en) * 2019-07-16 2021-01-21 深圳市菱奇半导体有限公司 Battery protection controller and battery charging and discharging protection circuit

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Application publication date: 20160420