CN201877809U - Battery core protection circuit for lithium battery - Google Patents
Battery core protection circuit for lithium battery Download PDFInfo
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- CN201877809U CN201877809U CN2010206696150U CN201020669615U CN201877809U CN 201877809 U CN201877809 U CN 201877809U CN 2010206696150 U CN2010206696150 U CN 2010206696150U CN 201020669615 U CN201020669615 U CN 201020669615U CN 201877809 U CN201877809 U CN 201877809U
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Abstract
The utility model relates to a battery core protection circuit for a lithium battery, which comprises a charging protection unit and a discharging protection unit, wherein the charging protection unit comprises an overcharging protection circuit, a charging inhibition discharging circuit and a charging switch tube, the discharging protection unit comprises a discharging overcurrent protection circuit, a short circuit protection circuit and a discharging switch tube, the charging switch tube is connected between a positive electrode of a charging terminal and a positive electrode of a battery core circuit, the discharging switch tube is connected between a negative electrode of the battery core circuit and a negative electrode discharging terminal, the input end of the overcharging protection circuit is connected with the positive electrode of the charging terminal, the output end of the overcharging protection circuit is connected with the control end of the charging switch tube, the negative electrode of the battery core circuit is connected with a negative electrode of the charging terminal, both the input end of the discharging overcurrent protection circuit and the input end of the short circuit protection circuit are connected with the negative electrode of the discharging terminal, and the output end of the discharging overcurrent protection circuit and the output end of the short circuit protection circuit are connected with the control end of the discharging switch tube. The battery core protection circuit disclosed by the utility model realizes the overall protection of the battery core of the battery and adapts to high requirements of electric products on battery performance, in addition, various functions are realized through the repeated use for many times of each element in the circuit, the structure is simple and compact, the reliability is high, and the cost is low.
Description
Technical field
The utility model relates to a kind of protective circuit that is applied to the lithium battery electric core of electronic product.
Background technology
Electronic product is operation for convenience, fail safe is had many requirements with portable, especially aspect battery.Lithium battery has characteristics such as volume is little, capacity is big, memoryless property, discharge-rate height, is widely used in the electronic product.
Electronic product has operating current and the bigger characteristics of immediate current of boot-strap, needs circuit can adjust the size of current and the time-delay thereof of discharge overcurrent protection and short-circuit protection, can recover discharge condition rapidly again after the protection simultaneously.In order to adapt to the above characteristic of electronic product; the charging fail safe of electronic product battery is also extremely important, need provide the overcharged voltage protection to it, forbids discharge when charging simultaneously; in particular cases also require to have the charge protection of forbidding, therefore the utility model circuit designs.
Summary of the invention
The purpose of this utility model provides and a kind ofly is suitable for electronic product and uses, have the protective circuit of the lithium battery electric core that improves defencive function.
For achieving the above object, the technical scheme that the utility model is taked is: a kind of lithium battery electric core protective circuit is provided, comprise charge protection unit and discharge prevention unit, described charge protection unit comprises overcharge protection circuit, charges and forbid discharge circuit and charge switch pipe, and described discharge prevention unit comprises overcurrent protection circuit for discharging electricity, short-circuit protection circuit and discharge switch pipe; It is characterized in that: described charge switch pipe is connected between charging terminal positive pole and the electric core circuit anode; The discharge switch pipe is connected between electric core circuit negative pole and the negative discharge terminal; Described overcharge protection circuit input is connected with charging terminal is anodal, and output is connected with charge switch pipe control end; Electricity core circuit negative pole is connected with the charging terminal negative pole; Overcurrent protection circuit for discharging electricity, short-circuit protection circuit input all are connected with discharge terminal negative pole, and output is connected with discharge switch pipe control end.
Compared with prior art, the beneficial effects of the utility model are: it has utilized one two batteries to protect IC to reach the general protection of the metal-oxide-semiconductor realization battery battery core of diode, triode and the Resistor-Capacitor Unit that is associated with this IC, a N raceway groove dexterously, has adapted to the high request of electronic product to battery performance; And the multiple function of the repeatedly multiplexing realization of each element in the described circuit, simple for structure, reliability is high, cost is low.
Description of drawings
Fig. 1 is an electric core protective circuit embodiment schematic diagram described in the utility model.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
The lithium battery electric core protective circuit that the utility model disclosed comprises charge protection unit and discharge prevention unit, also comprises forbidding charging/forbid discharge circuit.Wherein, the charge protection unit comprises overcharge protection circuit, charges and forbid that discharge circuit and charge switch pipe, charge switch pipe are connected between charging terminal positive pole and the electric core circuit anode; The discharge prevention unit comprises overcurrent protection circuit for discharging electricity, short-circuit protection circuit and discharge switch pipe, and the discharge switch pipe is connected between electric core circuit negative pole and the negative discharge terminal.
The specific embodiment circuit as shown in Figure 1, this circuit has overcharged voltage protection, protection, discharge overcurrent protection and short-circuit protection function are pressed in overdischarge, and forbids discharge when having charging, in case situation is removed quick-recovery discharging function soon behind the discharge prevention.Its concrete operation principle is as follows:
1, overcharged voltage defencive function
Overcharge protection circuit comprises integrated chip U1, switch triode Q7, driving resistor R5 and capacitor C 8.During charging, terminal C+ connects the charge power supply positive pole in the circuit, terminal C-connects the charge power supply negative pole, integrated chip U1 CO end output high level, through resistance R 5, capacitor C 8 control triode Q7 conductings, and then charge switch pipe Q1 conducting, power supply charges normal lithium-ion electric core through charge switch pipe Q1, charging diode D1.When the charging of lithium ion battery voltage reached the over-charge protective threshold values, integrated chip U1 CO held output low level, ended through resistance R 5, capacitor C 8 control triode Q7, and then made charge switch pipe Q1 by the cut-out charge circuit, thereby realize the overcharged voltage defencive function.
2. then forbid discharging function when charging
Charging forbids that discharge circuit comprises driving resistor R20, diode D5 and triode Q9, and charging voltage makes triode Q9 conducting through driving resistor R20, diode D5, and then makes discharge switch pipe Q11 by cutting off discharge loop, realizes charging and forbids discharging function.
3. discharge overcurrent protection function
Overcurrent protection circuit for discharging electricity comprises integrated chip U1, field effect transistor Q10 and capacitor C 4, C5.During discharge,, can cause damage, need protect it to electric coring circuit because extraneous load-reason may produce bigger discharging current.When discharge allows switch S 1 to connect, triode Q3, Q4 conducting, big electric current is through discharge switch pipe Q11, can on Q11, produce pressure drop, this voltage is charged through resistance R 16, field effect transistor Q10,13 pairs of capacitor C 4 of resistance R, C5 by P-simultaneously, when capacitor C 4, C5 both end voltage reach the over-current detection voltage of over-current detection end VM of chip U1 when above, chip U1 is through the internal circuit function, by discharge control end DO output low level.Because the grid of discharge switch pipe Q11 links by the DO end of resistance R 12, triode Q3 and U1, then Q11 ends, and closes discharge loop, has realized the discharge overcurrent protection function.
Wherein, the size of discharge overcurrent protection threshold value can realize that with the ratio of R13 the length of discharge overcurrent protection delay time can realize by the appearance value of adjusting capacitor C 4, C5 by adjusting resistance R 11.
4. short-circuit protection function
Short-circuit protection circuit comprises triode Q9, Q10 and capacitor C 7.During discharge,, circuit is caused very big damage, need protect it if discharge terminal both positive and negative polarity P+ and the careless short circuit of P-will form a short circuit current.When P+ and P-short circuit; P-reaches short circuit current protection to the electric current of B-; the voltage drop that produces on discharge switch pipe Q11 is charged to capacitor C 7 through resistance R 16, field effect transistor Q10, diode D4 by P-; the C7 both end voltage reaches definite value; then triode Q9 conducting; drag down the grid voltage of switching tube Q11, Q11 has realized short-circuit protection function by cutting off discharge loop.The length of the delay time of short-circuit protection can realize by the appearance value of adjusting C7.
5. defencive function is pressed in overdischarge
During discharge, the anodal P+ of discharge terminal connects the load positive pole, P-connects the load negative pole, when discharge allows switch S 1 to connect, triode Q3, Q4 conducting, integrated chip U1 DO end output high level, through resistance R 12, triode Q3 control discharge switch pipe Q11 conducting, B-carries out regular picture through discharge discharge switch pipe Q11 to P-to lithium-ion electric core.Put the protective valve threshold voltage when following when any single-unit lithium ion battery cell voltage drops to, integrated chip U1 DO holds output low level, and Q11 ends through resistance Q3, R12 control, cuts off discharge loop.Thereby realize overdischarge pressure defencive function.
6. the quick restore funcitons behind overcurrent and the short-circuit protection
Described taibiter comprises capacitor C 7, triode Q5, Q9.When circuit behind overcurrent or short-circuit protection; if load or circuit do not disconnect; the terminal both positive and negative polarity P+ that discharges so is identical with the voltage of P-; then the over-current detection end VM of integrated chip U1 can be in high level state at this moment; diode D4 is because P-voltage at this moment is identical with P+; also can be in unidirectional conducting state; then NPN triode Q5 continues conducting; Q5 collector electrode and U1 over-current detection end VM link; grounded emitter, then this moment, Q5 worked in the amplification region, so the voltage of over-current detection VM end can be dragged down; then chip U1 controls by internal wiring; at discharge control DO end meeting output HIGH voltage, triode Q9 also works in the amplification region simultaneously, drags down the grid voltage of discharge switch pipe Q11; field effect transistor Q11 still is in cut-off state, and discharge loop can't discharge.
When load is removed, the current potential of P-is dragged down, resistance R 16 can't reach the unidirectional conducting voltage of diode D4 to the pressure drop on ground, then the voltage of capacitor C 7 also can and then descend, triode Q5, Q9 recover to end, because the DO end has been exported high level, discharge switch pipe Q11 can be in open mode, and discharge loop can discharge.In the past in the design, when discharge will wait the voltage at capacitor C 4, C5 two ends to drop to U1 over-current detection end VM to allow voltage following recovery time, just can discharge again, can't realize fast quick-recovery.
7. charging disable circuit, discharge inhibit circuit function
Describedly forbid charging/forbid that discharge circuit comprises triode Q6, Q7, Q8 and switch S 2.When switch S 2 was connected, triode Q6, Q7 conducting made charge switch pipe Q1 be in cut-off state, realized forbidding charging; Triode Q8 conducting makes discharge discharge switch pipe Q11 be in cut-off state, realizes forbidding discharge;
The utility model circuit has been realized two joint power lithium cell electric cores various defencive functions, but this working method not only is confined to two batteries electricity core, the protection philosophy of more piece electricity core also from then on thinking set out and design realization.
The foregoing description only is a preferred implementation of the present utility model, and in addition, the utility model can also have other implementations.That is to say that under the prerequisite that does not break away from the utility model design, any conspicuous replacement also should fall within the protection range of the present utility model.
Claims (9)
1. lithium battery electric core protective circuit, comprise charge protection unit and discharge prevention unit, described charge protection unit comprises overcharge protection circuit, charges and forbid discharge circuit and charge switch pipe, and described discharge prevention unit comprises overcurrent protection circuit for discharging electricity, short-circuit protection circuit and discharge switch pipe; It is characterized in that: described charge switch pipe is connected between charging terminal positive pole and the electric core circuit anode; The discharge switch pipe is connected between electric core circuit negative pole and the negative discharge terminal; Described overcharge protection circuit input is connected with charging terminal is anodal, and output is connected with charge switch pipe control end; Electricity core circuit negative pole is connected with the charging terminal negative pole; Overcurrent protection circuit for discharging electricity, short-circuit protection circuit input all are connected with discharge terminal negative pole, and output is connected with discharge switch pipe control end.
2. lithium battery electric core protective circuit according to claim 1 is characterized in that: further comprise the taibiter of realizing fast quick-recovery discharging function behind overcurrent when being used to discharge or the short-circuit protection.
3. lithium battery electric core protective circuit according to claim 2 is characterized in that: described taibiter comprises capacitor C 7, triode Q5, Q9; After the load releasing of overcurrent or short circuit takes place, the current potential of discharge terminal negative pole P-is dragged down, resistance R 16 can't reach the unidirectional conducting voltage of diode D4 to the pressure drop on ground, then the voltage of capacitor C 7 descends, triode Q5, Q9 recover to end, integrated chip U1 DO end output this moment high level, discharge switch pipe Q11 is in open mode, and discharge loop recovers discharge.
4. lithium battery electric core protective circuit according to claim 3 is characterized in that: further comprise forbidding charging/forbid discharge circuit.
5. lithium battery electric core protective circuit according to claim 4 is characterized in that: describedly forbid charging/forbid that discharge circuit comprises triode Q6, Q7, Q8 and switch S 2; Switch S 2 closures in the charge/discharge inhibit circuit, triode Q6, Q7 conducting in succession, then charge switch pipe Q1 forbids by realizing charging; Triode Q8 conducting simultaneously, then discharge switch pipe Q11 forbids by realizing discharging.
6. according to any described lithium battery electric core protective circuit among the claim 1-5, it is characterized in that: described overcharge protection circuit comprises integrated chip U1, switch triode Q7, driving resistor R5 and capacitor C 8; During charging, integrated chip U1 is by driving resistor R5, capacitor C 8 control switch triode Q7 conductings, and then charge switch pipe Q1 conducting; When the cell voltage charging reached the over-charge protective threshold values, integrated chip U1 control switch triode Q7 ended, and then charge switch pipe Q1 realizes over-charge protective by cutting off charge circuit.
7. lithium battery electric core protective circuit according to claim 6; it is characterized in that: described charging forbids that discharge circuit comprises driving resistor R20, diode D5 and triode Q9; charging voltage makes triode Q9 conducting through driving resistor R20, diode D5; and then make discharge switch pipe Q11 by cutting off discharge loop, realize charging and forbid discharging function.
8. lithium battery electric core protective circuit according to claim 7 is characterized in that: described overcurrent protection circuit for discharging electricity comprises integrated chip U1, field effect transistor Q10 and capacitor C 4, C5; When allowing switch S 1, discharge connects, triode Q4, Q3 is conducting in succession, integrated chip U1 DO pin output high level makes discharge switch pipe Q11 conducting carry out regular picture, big discharging current passes through discharge switch pipe Q11 successively to the terminal negative pole P-that discharges, and by resistance R 16, field effect transistor Q10, resistance R 13 is to capacitor C 4, the C5 charging, when capacitor C 4, after the C5 both end voltage reaches the detection voltage of over-current detection end VM of integrated chip U1, integrated chip U1 discharge control end DO output low level, then triode Q3 ends, cut off the driving high level of discharge discharge switch pipe Q11, then the load terminal negative pole P-end level that will discharge is drawn high to the anodal P+ of discharge terminal identical, high level is by resistance R 16, field effect transistor Q10, diode D4 makes triode Q9 conducting, discharge switch pipe Q11 drive level is pulled to low level cuts off discharge loop.
9. lithium battery electric core protective circuit according to claim 8; it is characterized in that: described short-circuit protection circuit comprises triode Q9, Q10 and capacitor C 7; when anodal P+ of discharge terminal and negative pole P-short circuit; the voltage drop that produces on discharge switch pipe Q11 is charged to capacitor C 7 by discharge terminal negative pole P-, resistance R 16, field effect transistor Q10, diode D4; the C7 both end voltage reaches definite value; then triode Q9 conducting; the grid voltage Q11 that drags down discharge switch pipe Q11 ends, and cuts off discharge loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206696150U CN201877809U (en) | 2010-12-20 | 2010-12-20 | Battery core protection circuit for lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206696150U CN201877809U (en) | 2010-12-20 | 2010-12-20 | Battery core protection circuit for lithium battery |
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| CN201877809U true CN201877809U (en) | 2011-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206696150U Expired - Fee Related CN201877809U (en) | 2010-12-20 | 2010-12-20 | Battery core protection circuit for lithium battery |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701101A (en) * | 2013-12-14 | 2014-04-02 | 苏州市博得立电源科技有限公司 | Circuit structure for improving short-circuit protection performance of large-sized battery pack by using capacitor |
| CN105375444A (en) * | 2015-10-28 | 2016-03-02 | 邹小辉 | Lithium battery protection circuit |
| CN108323315A (en) * | 2018-01-15 | 2018-07-27 | 宁波大叶园林设备股份有限公司 | Cut the gardens grass trimmer for stopping knife power-saving circuit system in a kind of tool intelligence side |
| CN109560584A (en) * | 2018-12-07 | 2019-04-02 | 浙江千喜新能源有限公司 | Lithium battery group charge-discharge protection circuit and power module |
| CN110365074A (en) * | 2016-09-20 | 2019-10-22 | 华为技术有限公司 | A kind of battery, terminal and charging system |
-
2010
- 2010-12-20 CN CN2010206696150U patent/CN201877809U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701101A (en) * | 2013-12-14 | 2014-04-02 | 苏州市博得立电源科技有限公司 | Circuit structure for improving short-circuit protection performance of large-sized battery pack by using capacitor |
| CN105375444A (en) * | 2015-10-28 | 2016-03-02 | 邹小辉 | Lithium battery protection circuit |
| CN110365074A (en) * | 2016-09-20 | 2019-10-22 | 华为技术有限公司 | A kind of battery, terminal and charging system |
| US11444470B2 (en) | 2016-09-20 | 2022-09-13 | Huawei Technologies Co., Ltd. | Battery, terminal, and charging system |
| US11962176B2 (en) | 2016-09-20 | 2024-04-16 | Huawei Technologies Co., Ltd. | Battery, terminal, and charging system |
| CN108323315A (en) * | 2018-01-15 | 2018-07-27 | 宁波大叶园林设备股份有限公司 | Cut the gardens grass trimmer for stopping knife power-saving circuit system in a kind of tool intelligence side |
| CN109560584A (en) * | 2018-12-07 | 2019-04-02 | 浙江千喜新能源有限公司 | Lithium battery group charge-discharge protection circuit and power module |
| CN109560584B (en) * | 2018-12-07 | 2022-04-15 | 浙江千喜新能源有限公司 | Lithium battery pack charging and discharging protection circuit and power module |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20191220 |
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| CF01 | Termination of patent right due to non-payment of annual fee |