CN207504601U - Lithium battery multiple protective circuit - Google Patents

Lithium battery multiple protective circuit Download PDF

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Publication number
CN207504601U
CN207504601U CN201721349965.7U CN201721349965U CN207504601U CN 207504601 U CN207504601 U CN 207504601U CN 201721349965 U CN201721349965 U CN 201721349965U CN 207504601 U CN207504601 U CN 207504601U
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CN
China
Prior art keywords
unit
lithium battery
electrically
protection circuit
oxide
Prior art date
Application number
CN201721349965.7U
Other languages
Chinese (zh)
Inventor
谢略
Original Assignee
东莞启益电器机械有限公司
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Publication date
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Priority to CN201721349965.7U priority Critical patent/CN207504601U/en
Application granted granted Critical
Publication of CN207504601U publication Critical patent/CN207504601U/en

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Abstract

The utility model discloses a kind of lithium battery multiple protective circuits; it includes power supply unit, rectifier diode unit, first class of protection circuit unit and safe secondary protection circuit unit; the anode tap of the rectifier diode unit is electrically connected power supply unit positive terminal; an input terminal at lithium battery anode end, an input terminal of first class of protection circuit unit and safe secondary protection circuit unit, another input terminal of the first class of protection circuit unit and another input end grounding of safe secondary protection circuit unit is electrically connected in the cathode terminal of the rectifier diode unit;The test side of the power supply unit negative pole end and first class of protection circuit unit is electrically connected; the output terminal of the first class of protection circuit unit is electrically connected the test side of safe secondary protection circuit unit, and the output terminal of the safe secondary protection circuit unit is electrically connected cathode of lithium battery end.The duplicate protection that the utility model realization overcharges lithium battery, it is simple in structure, improve lithium battery service life.

Description

Lithium battery multiple protective circuit
Technical field
The utility model is related to consumer electronics field, more particularly, to a kind of lithium battery multiple protective circuit.
Background technology
Substance protection circuit is fairly simple, and defencive function power is limited, if substance shielding failure cannot effective protection lithium Battery has larger impact to service life of lithium battery, and What is more can generate safety problem, and consumer is damaged.
Utility model content
Based on this, it is necessary to for above-mentioned background technology there are the problem of, a kind of lithium battery multiple protective circuit is provided, is changed Become existing separately protected charging modes, it is simple in structure, it can charge to single lithium battery and carry out multiple protective.
To achieve the above object, the utility model discloses a kind of lithium battery multiple protective circuit, including power supply unit, Rectifier diode unit, first class of protection circuit unit and safe secondary protection circuit unit, the anode tap of the rectifier diode unit Power supply unit positive terminal is electrically connected, lithium battery anode end, one is electrically connected in the cathode terminal of the rectifier diode unit Grade protection circuit unit an input terminal and safe secondary protection circuit unit an input terminal, the first class of protection circuit unit it is another Another input end grounding of one input terminal and safe secondary protection circuit unit;The power supply unit negative pole end and first class of protection circuit list The test side of member is electrically connected, and the output terminal of the first class of protection circuit unit is electrically connected the detection of safe secondary protection circuit unit End, the output terminal of the safe secondary protection circuit unit are electrically connected cathode of lithium battery end.
The first class of protection circuit unit includes the first chip unit, first resistor and the in one of the embodiments, One metal-oxide-semiconductor, the power supply unit negative pole end is electrically connected by the voltage detecting end of first resistor and the first chip unit, described The voltage output end of first chip unit is electrically connected the grid of the first metal-oxide-semiconductor, and the source electrode of first metal-oxide-semiconductor is electrically connected electricity The negative pole end of source unit, the drain electrode of first metal-oxide-semiconductor are electrically connected the test side of safe secondary protection circuit unit;The lithium battery Positive terminal is electrically connected by the positive terminal of second resistance and the first chip unit, the cathode of lithium battery end and the first chip list The negative pole end of member is electrically connected.
The first electricity is provided between the positive terminal and negative pole end of first chip unit in one of the embodiments, Hold.
The safe secondary protection circuit unit includes the second chip unit, 3rd resistor and the in one of the embodiments, Two metal-oxide-semiconductors, the drain electrode of a metal-oxide-semiconductor is electrically connected by 3rd resistor and the voltage detecting end of the second chip unit, described The voltage output end of second chip unit is electrically connected the grid of the second metal-oxide-semiconductor, and the source electrode of second metal-oxide-semiconductor is electrically connected the The drain electrode of one metal-oxide-semiconductor, the drain electrode of second metal-oxide-semiconductor are electrically connected cathode of lithium battery end, for by the electricity of the second chip unit The voltage output of pressure output terminal charges to lithium battery;The lithium battery anode end passes through the 4th resistance and the second chip unit Positive terminal be electrically connected, the negative pole end of the cathode of lithium battery end and the second chip unit is electrically connected.
The second electricity is provided between the positive terminal and negative pole end of second chip unit in one of the embodiments, Hold.
It is single that decompression is provided between the drain electrode of second metal-oxide-semiconductor and cathode of lithium battery end in one of the embodiments, Member.
The pressure unit includes the 5th resistance and the 6th resistance in parallel in one of the embodiments,.
In conclusion the utility model lithium battery multiple protective circuit is by setting the first chip unit, the second chip list Member, the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, by inside the first chip unit and the second chip unit to lithium battery charging voltage into Row detects and sends the break-make that high level or low level come control circuit circuit to the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, realizes to lithium The duplicate protection of over-charging of battery, it is simple in structure, improve lithium battery service life.
Description of the drawings
Fig. 1 is the schematic block circuit diagram of one embodiment of the utility model lithium battery multiple protective circuit;
Fig. 2 is the circuit diagram of the utility model lithium battery multiple protective circuit.
Specific embodiment
As depicted in figs. 1 and 2, the utility model lithium battery multiple protective circuit includes power supply unit 100, rectifier diode Unit 200, first class of protection circuit unit 300 and safe secondary protection circuit unit 400, the power supply unit 100 are electric to provide lithium Voltage needed for the charging of pond, the anode tap of the rectifier diode unit 200 is electrically connected 100 positive terminal of power supply unit, described whole Stream diode 200 cathode terminal be electrically connected lithium battery anode end, first class of protection circuit unit 300 an input terminal And an input terminal of safe secondary protection circuit unit 400, another input terminal and second class protection of the first class of protection circuit unit 300 Another input end grounding of circuit unit 400.
The test side of 100 negative pole end of power supply unit and first class of protection circuit unit 300 is electrically connected, and the level-one is protected The output terminal of protection circuit unit 300 is electrically connected the test side of safe secondary protection circuit unit 400, the safe secondary protection circuit unit 400 output terminal is electrically connected cathode of lithium battery end.
Specifically, the first class of protection circuit unit 300 includes the first chip unit U1, first resistor R1 and the first MOS Pipe Q1,100 negative pole end of power supply unit are electrically connected by the voltage detecting end of first resistor R1 and the first chip unit U1, The voltage output end of the first chip unit U1 is electrically connected the grid of the first metal-oxide-semiconductor Q1, the source electrode of the first metal-oxide-semiconductor Q1 The negative pole end of power supply unit 100 is electrically connected, the drain electrode of the first metal-oxide-semiconductor Q1 is electrically connected safe secondary protection circuit unit 400 Test side;The lithium battery anode end is electrically connected by the positive terminal of second resistance R2 and the first chip unit U1, described Cathode of lithium battery end and the negative pole end of the first chip unit U1 are electrically connected.
The first electricity is provided between the positive terminal and negative pole end of the first chip unit U1 in one of the embodiments, Hold C1, for filtering out the interference function in the first chip unit U1 power supply circuits, play filter action.
The safe secondary protection circuit unit 400 includes the second chip unit U2,3rd resistor R3 and the second metal-oxide-semiconductor Q2, institute The drain electrode of the first metal-oxide-semiconductor Q1 is stated by the electric connection of the voltage detecting end of 3rd resistor R3 and the second chip unit U2, described the The voltage output end of two chip unit U2 is electrically connected the grid of the second metal-oxide-semiconductor Q2, and the source electrode of the second metal-oxide-semiconductor Q2 electrically connects Connect the drain electrode of the first metal-oxide-semiconductor Q1, the drain electrode of the second metal-oxide-semiconductor Q2 is electrically connected cathode of lithium battery end, for by the second chip The voltage output of the voltage output end of unit U2 charges to lithium battery;The lithium battery anode end by the 4th resistance R4 with The positive terminal of second chip unit U2 is electrically connected, and the cathode of lithium battery end and the negative pole end of the second chip unit U2 electrically connect It connects.
The second electricity is provided between the positive terminal and negative pole end of the second chip unit U2 in one of the embodiments, Hold C2, for filtering out the interference function in the second chip unit U2 power supply circuits, play filter action.
In one of the embodiments, decompression is provided between the drain electrode of the second metal-oxide-semiconductor Q2 and cathode of lithium battery end Unit 500, the pressure unit 500 include the 5th resistance R5 and the 6th resistance R6 in parallel, with to avoid lithium battery both ends electricity It presses and bigger than normal service life of lithium battery is damaged.
During the utility model specific works, the voltage output end output high level of the first chip unit U1, the first metal-oxide-semiconductor Q1 Conducting, wherein, the output voltage values of the voltage output end of the first chip unit U1 are the threshold voltages using the first metal-oxide-semiconductor Q1 as base Standard, by detecting the positive terminal of the first chip unit U1 and the negative pole end of the first chip unit U1 inside the first chip unit U1 Lithium battery voltage, when lithium battery both end voltage difference is slowly promoted to the voltage output terminal voltage of the first chip unit U1, the The voltage output end output low level signal of one chip unit U1, the first metal-oxide-semiconductor Q1 cut-offs, and then realize what lithium battery was overcharged One protects again.
Similarly, the voltage output end of the second chip unit U2 exports high level first, and the second metal-oxide-semiconductor Q2 is connected, wherein, the The output voltage values of the voltage output end of two chip unit U2 are the second chips on the basis of the threshold voltage of the second metal-oxide-semiconductor Q2 By detecting the lithium battery voltage of the positive terminal of the second chip unit U2 and the negative pole end of the second chip unit U2 inside unit U2, When lithium battery both end voltage difference is slowly promoted to the voltage output terminal voltage of the second chip unit U2, the second chip unit U2 Voltage output end output low level signal, the second metal-oxide-semiconductor Q2 cut-offs, and then realize the double protection that is overcharged to lithium battery, when First chip unit U1 circuits lose overcharge protective capability after, the second chip unit U2 then plays secondary protection function, structure letter It is single, it charges to lithium battery and carries out effective protection, improve lithium battery service life.
Wherein, the first chip unit U1 and the second chip unit U2 passes through its internal detection comparator detection chip list The positive terminal lithium battery voltage corresponding with negative pole end of member, the positive terminal lithium corresponding with negative pole end of the second chip unit U2 detections Corresponding with the negative pole end lithium battery voltage of positive terminal that cell voltage can be detected than the first chip unit U1 is high 0.07V;Described The chip model of one chip unit U1 is S-8200AAY-M6T1U, and the chip model of the second chip unit U2 is S- 8211CCV-M5T1U。
In conclusion the utility model lithium battery multiple protective circuit is by setting the first chip unit U1, the second chip Unit U2, the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2, by electric to lithium inside the first chip unit U1 and the second chip unit U2 Pond charging voltage be detected and send high level or low level to the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 come control circuit return The break-make on road realizes the duplicate protection overcharged to lithium battery, simple in structure, improves lithium battery service life.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed, But it should not be interpreted as limiting the scope of the present invention.It should be pointed out that for the common of this field For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.

Claims (7)

1. a kind of lithium battery multiple protective circuit, it is characterised in that:Including power supply unit, rectifier diode unit, first class of protection Circuit unit and safe secondary protection circuit unit, the anode tap of the rectifier diode unit are electrically connected power supply unit positive terminal, The cathode terminal of the rectifier diode unit be electrically connected lithium battery anode end, first class of protection circuit unit an input terminal And an input terminal of safe secondary protection circuit unit, another input terminal of the first class of protection circuit unit and safe secondary protection circuit list Another input end grounding of member;The test side of the power supply unit negative pole end and first class of protection circuit unit is electrically connected, described The output terminal of first class of protection circuit unit is electrically connected the test side of safe secondary protection circuit unit, the safe secondary protection circuit unit Output terminal be electrically connected cathode of lithium battery end.
2. lithium battery multiple protective circuit according to claim 1, it is characterised in that:The first class of protection circuit unit packet The first chip unit, first resistor and the first metal-oxide-semiconductor are included, the power supply unit negative pole end passes through first resistor and the first chip list The voltage detecting end of member is electrically connected, and the voltage output end of first chip unit is electrically connected the grid of the first metal-oxide-semiconductor, institute The source electrode for stating the first metal-oxide-semiconductor is electrically connected the negative pole end of power supply unit, and the drain electrode of first metal-oxide-semiconductor is electrically connected second class protection The test side of circuit unit;The lithium battery anode end is electrically connected by the positive terminal of second resistance and the first chip unit, The cathode of lithium battery end and the negative pole end of the first chip unit are electrically connected.
3. lithium battery multiple protective circuit according to claim 2, it is characterised in that:The anode of first chip unit The first capacitance is provided between end and negative pole end.
4. lithium battery multiple protective circuit according to claim 2, it is characterised in that:The safe secondary protection circuit unit packet The second chip unit, 3rd resistor and the second metal-oxide-semiconductor are included, the drain electrode of a metal-oxide-semiconductor passes through 3rd resistor and the second chip list The voltage detecting end of member is electrically connected, and the voltage output end of second chip unit is electrically connected the grid of the second metal-oxide-semiconductor, institute The source electrode for stating the second metal-oxide-semiconductor is electrically connected the drain electrode of the first metal-oxide-semiconductor, and the drain electrode of second metal-oxide-semiconductor is electrically connected lithium battery and bears Extremely, for the voltage output of the voltage output end of the second chip unit to be charged to lithium battery;The lithium battery anode End is electrically connected by the positive terminal of the 4th resistance and the second chip unit, the cathode of lithium battery end and the second chip unit Negative pole end is electrically connected.
5. lithium battery multiple protective circuit according to claim 4, it is characterised in that:The anode of second chip unit The second capacitance is provided between end and negative pole end.
6. lithium battery multiple protective circuit according to claim 4, it is characterised in that:The drain electrode of second metal-oxide-semiconductor with Cathode of lithium battery is provided with pressure unit between end.
7. lithium battery multiple protective circuit according to claim 6, it is characterised in that:The pressure unit includes in parallel 5th resistance and the 6th resistance.
CN201721349965.7U 2017-10-18 2017-10-18 Lithium battery multiple protective circuit CN207504601U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721349965.7U CN207504601U (en) 2017-10-18 2017-10-18 Lithium battery multiple protective circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721349965.7U CN207504601U (en) 2017-10-18 2017-10-18 Lithium battery multiple protective circuit

Publications (1)

Publication Number Publication Date
CN207504601U true CN207504601U (en) 2018-06-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201721349965.7U CN207504601U (en) 2017-10-18 2017-10-18 Lithium battery multiple protective circuit

Country Status (1)

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CN (1) CN207504601U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108767927A (en) * 2018-06-27 2018-11-06 杭州极速电子有限公司 A kind of lithium battery management system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108767927A (en) * 2018-06-27 2018-11-06 杭州极速电子有限公司 A kind of lithium battery management system

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