CN104362594A - Secondary overvoltage protection circuit for lithium battery protection boards - Google Patents
Secondary overvoltage protection circuit for lithium battery protection boards Download PDFInfo
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- CN104362594A CN104362594A CN201410606825.8A CN201410606825A CN104362594A CN 104362594 A CN104362594 A CN 104362594A CN 201410606825 A CN201410606825 A CN 201410606825A CN 104362594 A CN104362594 A CN 104362594A
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Abstract
The invention discloses a secondary overvoltage protection circuit for lithium battery protection boards. The secondary overvoltage protection circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a control chip, a power supply and a field-effect transistor. The control chip is used with a three-end thermal fuse, when the voltage detected by the control chip is more than or equal to 4.45V, the OUT end outputs high level to enable a drain and a source of the field-effect transistor to be connected, the three-end thermal fuse is forced to be subjected to pull-down fusing at the moment, secondary overvoltage protection is achieved, and accidents are avoided.
Description
Technical field
The present invention relates to a kind of safe secondary protection circuit, particularly relate to a kind of for lithium battery protection board overvoltage safe secondary protection circuit.
Background technology
Under normal circumstances, the design of intelligent power management lithium battery protection board is made up of managing electric quantity chip and protect IC or both integrated chips, field effect transistor and peripheral capacitance resistance ware, fuse or PTC etc.; Wherein protect IC generally uses, as over-charge protective, Cross prevention, overheat protector, overcurrent protection, short-circuit protection etc. as first class of protection; Fuse or PTC use as second class protection; as overheat protector, overcurrent protection, short-circuit protection; main force's design in traditional lithium battery protection board does not all design overvoltage second-level protection function, makes it in the process used, and may the use of battery be made to occur because overvoltage protection lost efficacy dangerous.
Summary of the invention
Object of the present invention is just to provide a kind of for lithium battery protection board overvoltage safe secondary protection circuit to solve the problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of for lithium battery protection board overvoltage safe secondary protection circuit, comprise the first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, first electric capacity, second electric capacity, 3rd electric capacity, 4th electric capacity, 5th electric capacity, control chip, power supply and field effect transistor, the first end of described first resistance is connected with the first end of described second resistance and the positive pole of described power supply respectively, second end of described first resistance is connected with the vdd terminal of described control chip and the first end of described 4th electric capacity respectively, second end of described 4th electric capacity respectively with the first end of described 3rd electric capacity, the GND end of described control chip is connected with the first end of described second electric capacity and ground connection, second end of described second electric capacity respectively with the first end of described first electric capacity, the first end of described 3rd resistance is connected with the VC4 end of described control chip, second end of described first electric capacity respectively with the second end of described second resistance, the VC1 end of described control chip, the VC2 end of described control chip is connected with the VC3 end of described control chip, second end of described 3rd resistance is connected with the negative pole of described power supply, described second end of the 3rd electric capacity is held with the CD of described control chip and is connected, the OUT end of described control chip is connected with the first end of described 4th resistance, second end of described 4th resistance is connected with the described first end of the 5th electric capacity and the grid of described field effect transistor respectively, second end of described 5th electric capacity is connected with the first end of described 5th resistance and ground connection, second end of described 5th resistance is connected with the source electrode of described field effect transistor, the drain electrode of described field effect transistor is connected with the guard terminal of fuse.
Particularly, the model of described control chip is BQ29412, and the overvoltage protection value of described control chip is 4.45V, and the model of described field effect transistor is AO3406, and described fuse is three end Thermal Cutoffs, and its model is D6X.
Particularly, the resistance value of described first resistance is 1K Ω, and the resistance value of described second resistance is 1K Ω, and the resistance value of described 3rd resistance is 1K Ω, and the resistance value of described 4th resistance is 220K Ω, and the resistance value of described 5th resistance is 220K Ω.
Particularly, the capacitance of described first electric capacity is 1uF, and the capacitance of described second electric capacity is 1uF, the electric capacity most 1uF of described 3rd electric capacity, and the capacitance of described 4th electric capacity is 1uF, and the capacitance of described 5th electric capacity is 1uF.
Beneficial effect of the present invention is:
The present invention is used for lithium battery protection board overvoltage safe secondary protection circuit and adopts control chip to coordinate three end Thermal Cutoffs to use; when the detection voltage that control chip detects is more than or equal to 4.45V; then OUT end exports high level and touches the drain electrode and source conduction that make field effect transistor; now three end Thermal Cutoffs fuse drop-down fusing by force; reach secondary overvoltage protection, avoid accident to occur.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the present invention for lithium battery protection board overvoltage safe secondary protection circuit.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, the present invention is used for lithium battery protection board overvoltage safe secondary protection circuit, comprise the first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, 4th electric capacity C4, 5th electric capacity C5, control chip U, power supply E and field effect transistor M, the first end of the first resistance R1 is connected with the first end of the second resistance R2 and the positive pole of power supply E respectively, second end of the first resistance R1 is connected with the vdd terminal of control chip U and the first end of the 4th electric capacity C4 respectively, second end of the 4th electric capacity C4 respectively with the first end of the 3rd electric capacity C3, the GND end of control chip U is connected with the first end of the second electric capacity C2 and ground connection, second end of the second electric capacity C2 respectively with the first end of the first electric capacity C1, the first end of the 3rd resistance R3 is connected with the VC4 end of control chip U, second end of the first electric capacity C1 respectively with second end of the second resistance R2, the VC1 end of control chip U, the VC2 end of control chip U is connected with the VC3 end of control chip U, second end of the 3rd resistance R3 is connected with the negative pole of power supply E, second end of the 3rd electric capacity C3 is held with the CD of control chip U and is connected, the OUT end of control chip U is connected with the first end of the 4th resistance R4, second end of the 4th resistance R4 is connected with the first end of the 5th electric capacity C5 and the grid of field effect transistor M respectively, second end of the 5th electric capacity C5 is connected with the first end of the 5th resistance R5 and ground connection, second end of the 5th resistance R5 is connected with the source electrode of field effect transistor M, the drain electrode of field effect transistor M is connected with the guard terminal of fuse.
The model of control chip U is BQ29412, the model of field effect transistor M is AO3406, and the overvoltage protection value of control chip U is 4.45V, fuse is three end Thermal Cutoffs, and its model is D6X, the resistance value of the first resistance R1 is 1K Ω, the resistance value of the second resistance R2 is 1K Ω, the resistance value of the 3rd resistance R3 is 1K Ω, the resistance value of the 4th resistance R4 is 220K Ω, the resistance value of the 5th resistance R5 is 220K Ω, the capacitance of the first electric capacity C1 is 1uF, the capacitance of the second electric capacity C2 is 1uF, the electric capacity most 1uF of the 3rd electric capacity C3, the capacitance of the 4th electric capacity C4 is 1uF, the capacitance of the 5th electric capacity C5 is 1uF.
The operation principle that the present invention is used for lithium battery protection board overvoltage safe secondary protection circuit is as follows:
The voltage detecting and controling circuit of this protective circuit by the first resistance R1 to the 4th resistance R4, first electric capacity C1 forms to the 4th electric capacity C4 and control chip U, second resistance R2, 3rd resistance R3, first electric capacity C1, second electric capacity C2 and the 3rd electric capacity C3 is that each unit corresponding to battery core provides a filter and carry out filtering input, first resistance R1 and the 4th resistance R4 plays metering function, after first electric capacity C1 setup times postpones, activate the time (time of delay is calculated as td=1.2V*DelayCap (uF)/0.18uA) that any battery core exported exceedes threshold voltage, the VC1 end of control chip U, VC2 holds, the filter circuit that VC3 end and VC4 hold the capacitance resistance ware respectively by correspondence to form detects the voltage of corresponding battery core unit, and control chip U overvoltage protection value is 4.45V, VC1 end when if first class of protection lost efficacy, VC2 holds, VC3 holds corresponding GND to hold to detect voltage to be more than or equal to 8.90V or VC4 and holds corresponding GND to hold to detect voltage when being more than or equal to 4.45V, then OUT end exports high level and touches the drain electrode and source conduction that make field effect transistor M, now fuse drop-down fusing by force, reach secondary overvoltage protection, accident is avoided to occur, namely when there is overvoltage, disposablely by force melt disconnected Thermal Cutoffs, battery accident is avoided to occur.
Technical scheme of the present invention is not limited to the restriction of above-mentioned specific embodiment, the technology distortion that every technical scheme according to the present invention is made, and all falls within protection scope of the present invention.
Claims (4)
1. one kind for lithium battery protection board overvoltage safe secondary protection circuit, it is characterized in that: comprise the first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, first electric capacity, second electric capacity, 3rd electric capacity, 4th electric capacity, 5th electric capacity, control chip, power supply and field effect transistor, the first end of described first resistance is connected with the first end of described second resistance and the positive pole of described power supply respectively, second end of described first resistance is connected with the vdd terminal of described control chip and the first end of described 4th electric capacity respectively, second end of described 4th electric capacity respectively with the first end of described 3rd electric capacity, the GND end of described control chip is connected with the first end of described second electric capacity and ground connection, second end of described second electric capacity respectively with the first end of described first electric capacity, the first end of described 3rd resistance is connected with the VC4 end of described control chip, second end of described first electric capacity respectively with the second end of described second resistance, the VC1 end of described control chip, the VC2 end of described control chip is connected with the VC3 end of described control chip, second end of described 3rd resistance is connected with the negative pole of described power supply, described second end of the 3rd electric capacity is held with the CD of described control chip and is connected, the OUT end of described control chip is connected with the first end of described 4th resistance, second end of described 4th resistance is connected with the described first end of the 5th electric capacity and the grid of described field effect transistor respectively, second end of described 5th electric capacity is connected with the first end of described 5th resistance and ground connection, second end of described 5th resistance is connected with the source electrode of described field effect transistor, the drain electrode of described field effect transistor is connected with the guard terminal of fuse.
2. according to claim 1 for lithium battery protection board overvoltage safe secondary protection circuit; it is characterized in that: the model of described control chip is BQ29412; and the overvoltage protection value of described control chip is 4.45V; the model of described field effect transistor is AO3406; described fuse is three end Thermal Cutoffs, and its model is D6X.
3. according to according to claim 1 for lithium battery protection board overvoltage safe secondary protection circuit; it is characterized in that: the resistance value of described first resistance is 1K Ω; the resistance value of described second resistance is 1K Ω; the resistance value of described 3rd resistance is 1K Ω; the resistance value of described 4th resistance is 220K Ω, and the resistance value of described 5th resistance is 220K Ω.
4. according to according to claim 1 for lithium battery protection board overvoltage safe secondary protection circuit; it is characterized in that: the capacitance of described first electric capacity is 1uF; the capacitance of described second electric capacity is 1uF; the electric capacity most 1uF of described 3rd electric capacity; the capacitance of described 4th electric capacity is 1uF, and the capacitance of described 5th electric capacity is 1uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410606825.8A CN104362594A (en) | 2014-10-31 | 2014-10-31 | Secondary overvoltage protection circuit for lithium battery protection boards |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410606825.8A CN104362594A (en) | 2014-10-31 | 2014-10-31 | Secondary overvoltage protection circuit for lithium battery protection boards |
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| CN104362594A true CN104362594A (en) | 2015-02-18 |
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| CN201410606825.8A Pending CN104362594A (en) | 2014-10-31 | 2014-10-31 | Secondary overvoltage protection circuit for lithium battery protection boards |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882857A (en) * | 2015-06-18 | 2015-09-02 | 安徽朗越环境工程有限公司 | Protection circuit and protection method for safe charging of lithium battery by lithium-ion solar street lamp |
| CN106356494A (en) * | 2016-11-22 | 2017-01-25 | 宇龙计算机通信科技(深圳)有限公司 | Battery, battery explosion prevention method and related device |
| CN106405441A (en) * | 2016-11-13 | 2017-02-15 | 深圳市迅特通信技术有限公司 | Aging testing device for optical module |
| CN110971109A (en) * | 2019-04-30 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Drive control module, circuit detection and control method |
| CN113049970A (en) * | 2021-03-19 | 2021-06-29 | 东莞新能德科技有限公司 | Battery protection plate, battery and detection method |
-
2014
- 2014-10-31 CN CN201410606825.8A patent/CN104362594A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882857A (en) * | 2015-06-18 | 2015-09-02 | 安徽朗越环境工程有限公司 | Protection circuit and protection method for safe charging of lithium battery by lithium-ion solar street lamp |
| CN106405441A (en) * | 2016-11-13 | 2017-02-15 | 深圳市迅特通信技术有限公司 | Aging testing device for optical module |
| CN106405441B (en) * | 2016-11-13 | 2023-08-04 | 深圳市迅特通信技术股份有限公司 | Aging test device of optical module |
| CN106356494A (en) * | 2016-11-22 | 2017-01-25 | 宇龙计算机通信科技(深圳)有限公司 | Battery, battery explosion prevention method and related device |
| CN110971109A (en) * | 2019-04-30 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Drive control module, circuit detection and control method |
| CN110971109B (en) * | 2019-04-30 | 2021-02-19 | 宁德时代新能源科技股份有限公司 | Drive control module, circuit detection and control method |
| CN113049970A (en) * | 2021-03-19 | 2021-06-29 | 东莞新能德科技有限公司 | Battery protection plate, battery and detection method |
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