CN204258279U - A kind of lithium battery low voltage protection circuit - Google Patents

A kind of lithium battery low voltage protection circuit Download PDF

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Publication number
CN204258279U
CN204258279U CN201420798607.4U CN201420798607U CN204258279U CN 204258279 U CN204258279 U CN 204258279U CN 201420798607 U CN201420798607 U CN 201420798607U CN 204258279 U CN204258279 U CN 204258279U
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China
Prior art keywords
storage battery
oxide
metal
effect transistor
control
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Expired - Fee Related
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CN201420798607.4U
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Chinese (zh)
Inventor
朱碧芳
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Shenzhen Elite Electronic Co Ltd
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Wenzhou Kaitang Electronic Technology Co Ltd
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Priority to CN201420798607.4U priority Critical patent/CN204258279U/en
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Abstract

The utility model discloses a kind of lithium battery low voltage protection circuit, comprises storage battery BT, electric capacity C1, electric capacity C2, electric capacity C3, metal-oxide half field effect transistor V1, metal-oxide half field effect transistor V2, diode D1, diode D2 and control IC; Electric capacity C1 meets storage battery BT, and control IC pin VDD is connected between C1 and storage battery BT; Electric capacity C2 mono-termination storage battery BT, another termination control IC pin V-; Electric capacity C3 mono-termination storage battery BT, another termination control IC pin Ct; Metal-oxide half field effect transistor V1 meets storage battery BT, control IC pin Do and metal-oxide half field effect transistor V2 simultaneously; Metal-oxide half field effect transistor V2 meets control IC pin Co; Diode D1 is in parallel with metal-oxide half field effect transistor V1; Diode D2 is in parallel with metal-oxide half field effect transistor V2; Control IC pin VSS meets storage battery BT.The utility model can prevent from causing damage to lithium battery because of overdischarge.

Description

A kind of lithium battery low voltage protection circuit
Technical field
The utility model relates to a kind of lithium battery low voltage protection circuit.
Background technology
Lithium battery is a class is negative material, the battery using non-aqueous electrolytic solution by lithium metal or lithium alloy.Due to the chemical characteristic of lithium ion battery, in normal use procedure, the chemical positive reaction that electric energy and chemical energy transform mutually is carried out in its inside, but under certain conditions, as inside battery generation chemical side reactions will be caused to its overdischarge, after this side reaction aggravation, meeting grievous injury battery, affects its performance and useful life.Therefore, need lithium battery design under-voltage protection.
Utility model content
For above-mentioned technical deficiency, the utility model provides a kind of lithium battery low voltage protection circuit, can prevent lithium battery overdischarge, protects when its low-voltage.
To achieve these goals, the technical solution adopted in the utility model is as follows:
A kind of lithium battery low voltage protection circuit, comprises the control IC that storage battery BT, electric capacity C1, electric capacity C2, electric capacity C3, metal-oxide half field effect transistor V1, metal-oxide half field effect transistor V2, diode D1, diode D2 and model are R5421, wherein:
Electric capacity C1 connects storage battery BT, and control IC pin VDD is connected between C1 and storage battery BT;
Electric capacity C2 mono-termination storage battery BT, another termination control IC pin V-;
Electric capacity C3 mono-termination storage battery BT, another termination control IC pin Ct;
Metal-oxide half field effect transistor V1 meets storage battery BT, control IC pin Do and metal-oxide half field effect transistor V2 simultaneously;
Metal-oxide half field effect transistor V2 meets control IC pin Co;
Diode D1 is in parallel with metal-oxide half field effect transistor V1;
Diode D2 is in parallel with metal-oxide half field effect transistor V2;
Control IC pin VSS meets storage battery BT.
As preferably, the model of described metal-oxide half field effect transistor V1, V2 is SI9926.
Further, the utility model also comprises the resistance R1 of a termination storage battery BT, another termination capacitor C1.
Again further, the utility model also comprises the resistance R2 of a termination control IC pin V-, another termination storage battery BT.
Further, the utility model also comprises the fuse FUSE be connected with storage battery BT.
Compared with prior art, the utility model has following beneficial effect:
The utility model provides a kind of low voltage protection circuit of lithium battery, effectively can protect in lithium battery overdischarge process to it, guarantees that lithium battery does not cause because voltage is low battery to suffer damage, and then extends its useful life.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail, and execution mode of the present utility model includes but not limited to the following example.
Embodiment
As shown in Figure 1; the utility model is mainly used in protecting lithium battery overdischarge; it comprises the control IC that storage battery BT, electric capacity C1, electric capacity C2, electric capacity C3, metal-oxide half field effect transistor V1, metal-oxide half field effect transistor V2, diode D1, diode D2 and model are R5421, wherein:
Electric capacity C1 connects storage battery BT, and control IC pin VDD is connected between C1 and storage battery BT;
Electric capacity C2 mono-termination storage battery BT, another termination control IC pin V-;
Electric capacity C3 mono-termination storage battery BT, another termination control IC pin Ct;
Metal-oxide half field effect transistor V1 meets storage battery BT, control IC pin Do and metal-oxide half field effect transistor V2 simultaneously;
Metal-oxide half field effect transistor V2 meets control IC pin Co;
Diode D1 is in parallel with metal-oxide half field effect transistor V1;
Diode D2 is in parallel with metal-oxide half field effect transistor V2;
Control IC pin VSS meets storage battery BT.
In above-mentioned components and parts, the model of metal-oxide half field effect transistor V1, V2 is SI9926, and the utility model is also provided with resistance R1 and resistance R2 respectively, wherein, and resistance R1 mono-termination storage battery BT, another termination capacitor C1; Resistance R2 mono-termination control IC pin V-, another termination storage battery BT.
In addition, for protecting storage battery BT further, storage battery BT is also connected with fuse FUSE.
The operation principle of the utility model under-voltage protection is:
" Co " and " Do " pin all output HIGH voltages of IC controller in circuit in normal state, two metal-oxide half field effect transistors are all in conducting state, storage battery BT freely can carry out charging and discharging, because the conduction impedance of metal-oxide half field effect transistor is very little, usually be less than 30 milliohms, therefore its conducting resistance is very little to the performance impact of circuit.
At storage battery BT in external loading discharge process, its voltage can reduce gradually along with discharge process, and when cell voltage is down to certain low pressure, its capacity is given out light completely, if now allow battery continue load discharge, will cause the permanent damage of battery.
In battery discharge procedure; when control IC detects that cell voltage is determined by control IC lower than this value of 2.3V(; different IC has different values) time; its " Do " pin will change no-voltage into by high voltage; metal-oxide half field effect transistor V1 is made to transfer shutoff to by conducting; thus cut off discharge loop, storage battery BT cannot be discharged to load again, serve over effect.And now due to the existence of diode D1, charger can be charged to storage battery BT by this diode D1.
Because under over state, storage battery BT voltage can not reduce again, therefore the current sinking of claimed circuit is minimum, and now control IC can enter low power consumpting state, and whole protective circuit power consumption can be less than 0.1 μ A.Detect that cell voltage turns off between metal-oxide half field effect transistor V1 signal lower than 2.3V to sending at control IC, also one section of delay time is had, the length of this delay time is determined by electric capacity C3, is usually set to about 100 milliseconds, to avoid causing erroneous judgement because of interference.
Except above-mentioned battery overdischarge protection, the utility model also can realize additives for overcharge protection and overcurrent protection, and operation principle is as follows respectively:
Additives for overcharge protection
The charging modes that lithium ion battery requires is constant current/constant voltage, at the charging initial stage, is constant current charge, along with charging process, it is different according to positive electrode that voltage can rise to 4.2V(, and some battery request constant voltage values are 4.1V), transfer constant voltage charge to, until electric current is more and more less.
Storage battery BT is by charging process, if charger circuit is out of hand, cell voltage can be made to continue constant current charge more than after 4.2V, now cell voltage still can continue to rise, when cell voltage is charged to more than 4.3V, the chemical side reactions of battery will be aggravated, and can cause cell damage or occur safety problem.
With in the battery of protective circuit; when control IC detects that cell voltage reaches this value of 4.28V(and determined by control IC; different IC has different values) time; its " Co " pin will change no-voltage into by high voltage; metal-oxide half field effect transistor V2 is made to transfer shutoff to by conducting; thus cut off charge circuit, charger cannot be charged to storage battery BT again, play additives for overcharge protection effect.And now due to the existence of diode D2, storage battery BT can be discharged by this diode pair external loading.
Detect that cell voltage turns off between metal-oxide half field effect transistor V2 signal to sending more than 4.28V at control IC, also have one section of delay time, the length of this delay time is determined by electric capacity C3, is usually set to about 1 second, to avoid causing erroneous judgement because of interference.
Overcurrent protection
Due to the chemical characteristic of lithium ion battery, cell production companies define its discharging current maximum can not more than 2C(C=battery capacity/hour), when battery is more than 2C current discharge, the permanent damage of battery will be caused or occur safety problem.
Storage battery BT is in load normal discharge, discharging current is at 2 metal-oxide half field effect transistors through series connection, due to the conduction impedance of metal-oxide half field effect transistor, a voltage can be produced at its two ends, this magnitude of voltage U=I*RDS * 2RDS is single metal-oxide half field effect transistor conduction impedance, " V-" pin on control IC detects this magnitude of voltage, if load causes exception because of certain reason, loop current is increased, when loop current is greatly to making this value of U>0.1V(be determined by control IC, different IC has different values) time, its " Do " pin will change no-voltage into by high voltage, metal-oxide half field effect transistor V1 is made to transfer shutoff to by conducting, thus cut off discharge loop, electric current in loop is made to be zero, play overcurrent protection effect.
Detect that overcurrent occurs to turn off between metal-oxide half field effect transistor V1 signal to sending at control IC, also have one section of delay time, the length of this delay time is determined by electric capacity C3, is generally about 13 milliseconds, to avoid causing erroneous judgement because of interference.

Claims (5)

1. a lithium battery low voltage protection circuit; it is characterized in that: comprise the control IC that storage battery BT, electric capacity C1, electric capacity C2, electric capacity C3, metal-oxide half field effect transistor V1, metal-oxide half field effect transistor V2, diode D1, diode D2 and model are R5421, wherein:
Electric capacity C1 connects storage battery BT, and control IC pin VDD is connected between C1 and storage battery BT;
Electric capacity C2 mono-termination storage battery BT, another termination control IC pin V-;
Electric capacity C3 mono-termination storage battery BT, another termination control IC pin Ct;
Metal-oxide half field effect transistor V1 meets storage battery BT, control IC pin Do and metal-oxide half field effect transistor V2 simultaneously;
Metal-oxide half field effect transistor V2 meets control IC pin Co;
Diode D1 is in parallel with metal-oxide half field effect transistor V1;
Diode D2 is in parallel with metal-oxide half field effect transistor V2;
Control IC pin VSS meets storage battery BT.
2. a kind of lithium battery low voltage protection circuit according to claim 1, is characterized in that: the model of described metal-oxide half field effect transistor V1, V2 is SI9926.
3. a kind of lithium battery low voltage protection circuit according to claim 1 and 2, is characterized in that: the resistance R1 also comprising a termination storage battery BT, another termination capacitor C1.
4. a kind of lithium battery low voltage protection circuit according to claim 3, is characterized in that: the resistance R2 also comprising a termination control IC pin V-, another termination storage battery BT.
5. a kind of lithium battery low voltage protection circuit according to claim 4, is characterized in that: also comprise the fuse FUSE be connected with storage battery BT.
CN201420798607.4U 2014-12-17 2014-12-17 A kind of lithium battery low voltage protection circuit Expired - Fee Related CN204258279U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420798607.4U CN204258279U (en) 2014-12-17 2014-12-17 A kind of lithium battery low voltage protection circuit

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Application Number Priority Date Filing Date Title
CN201420798607.4U CN204258279U (en) 2014-12-17 2014-12-17 A kind of lithium battery low voltage protection circuit

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Publication Number Publication Date
CN204258279U true CN204258279U (en) 2015-04-08

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105610131A (en) * 2015-09-23 2016-05-25 宇龙计算机通信科技(深圳)有限公司 Cell protection circuit and cut-off prevented terminal charging method
CN106374437A (en) * 2015-07-20 2017-02-01 江苏爱福特科技开发有限公司 Battery protection circuit
CN108426519A (en) * 2018-04-04 2018-08-21 成都众宜天成科技有限公司 A kind of paint coating thickness based on temperature-compensation circuit accurately measures instrument
CN108730873A (en) * 2018-03-21 2018-11-02 成都申川节能环保工程有限公司 A kind of energy-saving LED road lamp with defencive function
CN108759757A (en) * 2018-04-04 2018-11-06 成都众宜天成科技有限公司 A kind of paint coating thickness measuring instrument
CN108889052A (en) * 2018-07-11 2018-11-27 成都新能互联科技有限公司 Haze device is efficiently removed based on anion generator
CN108905464A (en) * 2018-07-11 2018-11-30 成都新能互联科技有限公司 Can mobile phone charging park haze remove device
CN110712299A (en) * 2018-07-11 2020-01-21 成都众恒智合信息技术有限公司 Two-stage driving type cement mixing station for building

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106374437A (en) * 2015-07-20 2017-02-01 江苏爱福特科技开发有限公司 Battery protection circuit
CN105610131A (en) * 2015-09-23 2016-05-25 宇龙计算机通信科技(深圳)有限公司 Cell protection circuit and cut-off prevented terminal charging method
CN105610131B (en) * 2015-09-23 2019-01-25 宇龙计算机通信科技(深圳)有限公司 Battery protecting circuit and the terminal charging method of anti-cut-off
CN108730873A (en) * 2018-03-21 2018-11-02 成都申川节能环保工程有限公司 A kind of energy-saving LED road lamp with defencive function
CN108426519A (en) * 2018-04-04 2018-08-21 成都众宜天成科技有限公司 A kind of paint coating thickness based on temperature-compensation circuit accurately measures instrument
CN108759757A (en) * 2018-04-04 2018-11-06 成都众宜天成科技有限公司 A kind of paint coating thickness measuring instrument
CN108889052A (en) * 2018-07-11 2018-11-27 成都新能互联科技有限公司 Haze device is efficiently removed based on anion generator
CN108905464A (en) * 2018-07-11 2018-11-30 成都新能互联科技有限公司 Can mobile phone charging park haze remove device
CN110712299A (en) * 2018-07-11 2020-01-21 成都众恒智合信息技术有限公司 Two-stage driving type cement mixing station for building

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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: 20151225

Address after: 518132 Guangdong province Shenzhen Guangming New District Office of Gongming Tong community tourism industry science and Technology Parks Road Building 2, building 2, A District second floor B District second floor

Patentee after: Shenzhen Elite Electronic Co., Ltd.

Address before: 325014 Zhejiang city of Wenzhou province Ouhai three Yang Huang Yu Cun Si Qian Lian Jian building 6, No. 1 (third)

Patentee before: WENZHOU KAITANG ELECTRONIC TECHNOLOGY CO., LTD.

COR Change of bibliographic data
CB03 Change of inventor or designer information

Inventor after: Liu Jialong

Inventor before: Zhu Bifang

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: 20150408

Termination date: 20171217