CN204156508U - Short-circuit protection circuit of lithium battery - Google Patents
Short-circuit protection circuit of lithium battery Download PDFInfo
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- CN204156508U CN204156508U CN201420476272.4U CN201420476272U CN204156508U CN 204156508 U CN204156508 U CN 204156508U CN 201420476272 U CN201420476272 U CN 201420476272U CN 204156508 U CN204156508 U CN 204156508U
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Abstract
The utility model discloses a kind of short-circuit protection circuit of lithium battery, comprising: sampling module, detection module, protection module, switch module and driver module.Sampling module and switch module are connected and are connected between cathode of lithium battery and load negative terminal; The control end of switch module is connected to the output of driver module; Detection module comprises first input end and the second input; Sampling module is parallel between the first input end of detection module and the second input; Second input is also connected with the first power input; Protection module comprises control unit, the first switch element, second switch unit and feedback unit.Above-mentioned short-circuit protection circuit of lithium battery, can cut off output without the need to the control through control unit, and feedback unit can stablize output simultaneously.After short-circuit conditions is removed, control unit can control the automatic recovery of the conducting realizing circuit of second switch unit, and whole short-circuit protection circuit of lithium battery structure is simple and power consumption is lower.
Description
Technical field
The utility model relates to protective circuit technical field, particularly relates to a kind of short-circuit protection circuit of lithium battery.
Background technology
Lithium battery has light, high-energy-density and the feature such as pollution-free, therefore be widely used in the mobile devices such as mobile phone, notebook computer, video camera, and start to be applied fast in the field such as electric bicycle and electric tool, and be progressively applied to electronic and motor vehicle driven by mixed power field.Along with the continuous popularization of lithium battery applications, people require also to improve gradually to the security performance of lithium battery.Protection for lithium battery mainly comprise overcharge, cross put, overcurrent and short-circuit protection.Lithium batteries a lot of at present all adopt special integrated protection chip to carry out overcharge, cross put, overcurrent and short-circuit protection, but when integrated protection chip cannot take correct instruction in time because of interference, short-circuit protection circuit can be caused to lose efficacy.For avoiding occurring that this situation also needs to add extra short-circuit protection circuit in circuit.Its structure of traditional short-circuit protection circuit is comparatively complicated, and power consumption is higher.
Utility model content
Based on this, be necessary for the problems referred to above, the short-circuit protection circuit of lithium battery that a kind of structure is simple and low in energy consumption is provided.
A kind of short-circuit protection circuit of lithium battery, comprising: sampling module, detection module, protection module, switch module and driver module; Described sampling module and described switch module are series between cathode of lithium battery and load negative terminal; The control end of described switch module is connected to the output of described driver module; Described detection module comprises first input end and the second input; Described sampling module is parallel between the first input end of described detection module and the second input; The first input end of described detection module and the second input distribute successively along the sense of current flowing through described sampling module; Described second input is also connected with the first power input; The output of described detection module is connected with described control unit; Described protection module comprises control unit, the first switch element, second switch unit and feedback unit; The control end of described first switch element is connected with the output of described detection module, and the input of described first switch element is connected with the control end of described driver module, the output head grounding of described first switch element; The control end of described driver module is also connected with described control unit; Described detection module is used for exporting corresponding control signal according to the magnitude of voltage of described first input end and described second input, control conducting or the cut-off of described first switch element, and then controlled cut-off or the conducting of described switch module by described driver module; The control end of described second switch unit is connected to described control unit, and the input of described second switch unit is connected with the output of described detection module, the output head grounding of described second switch unit; The conducting when receiving the control signal that described control unit exports of described second switch unit, and then control described first switch element cut-off; Described feedback unit one end is connected to the output of described detection module, and the other end is connected to the first input end of described detection module, for maintaining the output of described detection module.
Wherein in an embodiment, described feedback unit comprises the first resistance and the first diode; Described first resistance one end is connected to the output of described detection module, and the other end is connected with the positive pole of described first diode; The negative pole of described first diode is connected to the first input end of described detection module.
Wherein in an embodiment; described protection module also comprises the 3rd switch element; for in load short circuits and electric current is less time control described detection module export control signal, control described first switching means conductive, and then controlled the cut-off of described switch module by described driver module.
Wherein in an embodiment, described 3rd switch element comprises switching tube, the second diode, the second resistance and the 3rd resistance; The control end of described switching tube connects the positive pole of described second diode; The negative pole of described second diode is connected with load anode; The input of described switching tube connects the first power input; Second resistance in parallel between the input of described switching tube and control end, is connected to the first input end of described detection module after output series connection the 3rd resistance of described switching tube.
Wherein in an embodiment, described switching tube is PMOS or PNP type triode.
Wherein in an embodiment, described first switch element and described second switch unit are metal-oxide-semiconductor or triode, and described switch module is then NMOS tube.
Wherein in an embodiment, described control unit is single-chip microcomputer.
Wherein in an embodiment, described detection module comprises an integrated operational amplifier, and described first input end is the in-phase input end of described integrated operational amplifier, and described second input is the inverting input of described integrated operational amplifier.
Wherein in an embodiment, also comprise delay circuit module, comprise delay capacitor and time delay resistance, described delay capacitor one end is connected to the first input end of described detection module, other end ground connection; Described time delay resistance one end is connected to described first input end, and the other end is connected between described switch module and described sampling module.
Wherein in an embodiment, described detection module also comprises the first sectional pressure element and the second sectional pressure element; Described first sectional pressure element is connected between described second input and described sampling module; Described second sectional pressure element is connected between described second input and described first power input.
Above-mentioned short-circuit protection circuit of lithium battery, when circuit is short-circuited, short-circuit protection circuit of lithium battery is without the control of control unit, and detection module just can control the first switching means conductive, and then driver module control switch module disconnects thus cuts off output.During short circuit, the output feedack of detection module can stable to export to first input end by feedback unit, and holding circuit is off-state, realizes automatic dead-locking function.After short-circuit conditions does not exist, control unit can control the automatic recovery of the conducting realizing circuit of second switch unit simultaneously, and whole short-circuit protection circuit of lithium battery structure is simple and power consumption is lower.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the short-circuit protection circuit of lithium battery in an embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Figure 1 shows that the theory diagram of the short-circuit protection circuit of lithium battery 100 in an embodiment.As shown in Figure 1, short-circuit protection circuit of lithium battery 100 is connected between lithium battery 200 and load, for cutting off the output of lithium battery 200 when lithium battery 200 is short-circuited.Short-circuit protection circuit of lithium battery 100 comprises sampling module 110, detection module 120, protection module 130, driver module 140 and switch module 150.
Sampling module 110 and switch module 150 are series at the negative pole of lithium battery 200 and export between negative terminal 320.Export negative terminal 320 for being connected with load negative terminal.The control end of switch module 150 is connected with the output of driver module 140.In the present embodiment, sampling module 110 is a sampling resistor.
Detection module 120 comprises first input end IN1 and the second input IN2.Sampling module 110 is parallel between first input end IN1 and the second input IN2.First input end IN1 and the second input IN2 distributes successively along the sense of current flowing through sampling module 110, namely first input end IN1 is connected between sampling module 110 and switch module 150, and the second input IN2 is then connected between sampling module 110 and lithium battery 200.Second input IN2 is also connected with the first power input VCC1.By the control to the first power input VCC1 input voltage, can realize setting, namely to the setting of reference voltage the voltage of the second input IN2.Detection module 120 for detecting the voltage at sampling module 110 two ends, and exports corresponding control signal according to the magnitude of voltage of first input end IN1 and the second input IN2, controls conducting or the cut-off of the first switch element 134 be attached thereto.In the present embodiment, detection module 120 mainly comprises an integrated operational amplifier.First input end IN1 is the in-phase input end of integrated operational amplifier, and the second input IN2 is the inverting input of integrated operational amplifier, and the output of detection module 120 is then the output of integrated operational amplifier.Particularly, control signal is level signal.
Protection module 130 comprises control unit 132, first switch element 134, second switch unit 136 and feedback unit 138.Wherein, the control end of the first switch element 134 is connected to the output of detection module 120.The input of the first switch element 134 is connected with the control end of driver module 140.The control end of driver module 140 is also connected with control unit 132.The output head grounding of the first switch element 134.The control end of second switch unit 136 is connected with control unit 132; The input of second switch unit 136 is connected with the output of detection module 120; The output head grounding of second switch unit 136.In the present embodiment, conducting or cut-off under the control of the control signal that the first switch element 134 exports at detection module 120, thus impel cut-off or the conducting of driver module 140 control switch module 150 further, realize the shutoff to whole circuit or unlatching.Short-circuit protection circuit of lithium battery 100 is without the need to realizing the shutoff to circuit by the control of control unit 132; can avoid, owing to bringing infringement to lithium battery 200 when control unit 132 is interfered and cannot takes right instructions in time, can effectively protecting lithium battery 200 rapidly.Second switch unit 136 is conducting or cut-off under the control of control unit 132.When second switch unit 136 conducting when receiving the control signal that control unit 132 exports, and then control the first switch element cut-off, thus the output of restore circuit, automatically replying of realizing circuit.
One end of feedback unit 138 is connected to the output of detection module 120, and the other end is then connected to the first input end IN1 of detection module 120.Feedback unit 138 can by the first input end IN1 of the output feedack of detection module 120 to detection module 120; make the stable output of detection module 120; and then stablize whole short-circuit protection circuit of lithium battery 100; avoid unlatching back and forth or the closedown of short-circuit protection circuit of lithium battery 100, while reducing power consumption, improve the stability of system.In the present embodiment, feedback unit 138 comprises the first resistance and the first diode.Particularly, first resistance one end is connected to the output of detection module 120, and the other end is then connected to the positive pole of the first diode.The negative pole of the second diode is connected to first input end IN1.Feedback unit 138 can realize automatic dead-locking function.
In the present embodiment, the output of detection module 120 is also connected with control unit 132, and for short-circuit state is sent to control unit 132, notice control unit 132 system is short-circuited.In the present embodiment, control unit 132 is a single-chip microcomputer, and its model is MC9S12X.Be appreciated that control unit 132 also can adopt other can realize the device of identical function.First switch element 134 and second switch unit 136 can be all field-effect transistor (metal-oxide-semiconductor) or triode.The control signal that control unit 132 exports is level signal.
Driver module 140 ends for the control switch module 150 when the first switch element 134 conducting, closes the output of whole circuit.The drive circuit that driver module 140 can adopt art technology field known.In the present embodiment, switch module 150 is NMOS tube, and internal resistance is less, low in energy consumption.The control end of switch module 150 is then the grid of NMOS tube.
The specific works principle of above-mentioned short-circuit protection circuit of lithium battery 100 is: when circuit is short-circuited, and the electric current in circuit becomes large instantaneously, and the ER effect flowing through sampling module 110 is large.The voltage of the first input end IN1 of detection module 120 is higher than after voltage (i.e. reference voltage) preset value of the second input IN2, detection module 120 exports high level and controls the first switch element 134 conducting as control signal, and then driver module 140 control switch module 150 is disconnected.Feedback unit 138 can realize feedback, and stable detection module 120 exports high level always, makes the first switch element 134 keep conducting state.After short circuit is removed, control unit 132 can send high level signal and control the conducting of second switch unit 136.Control the first switch element 132 after second switch unit 136 conducting to end, the conducting of driver module 140 control switch module 150, the automatic recovery of realizing circuit.After circuit recovers, the voltage of the first input end IN1 of detection module 120 reduces, and detection module 120 output low level, controls the first switch element 134 and end, the output of stabilizing circuit.
Above-mentioned short-circuit protection circuit of lithium battery 100, when circuit is short-circuited, detection module 120 just directly can control the first switch element 134 conducting without control unit 132, and then makes driver module 140 control switch module 150 disconnect thus cut off output.During short circuit, the output feedack of detection module 120 can stable to export to first input end IN1 by feedback unit 138, and holding circuit is off-state., the stability of a system improves.When short-circuit conditions does not exist, control unit 132 can control the recovery of the conducting realizing circuit of second switch unit 136 simultaneously, and whole short-circuit protection circuit of lithium battery 100 structure is simple and power consumption is lower.
In the present embodiment, short-circuit protection circuit of lithium battery can also comprise the 3rd switch element 139.3rd switch element 139 in load short circuits and electric current is less time, control detection module 120 export control signal, control the first switch element 134 conducting, and then ended by driver module 140 control switch module 150, disconnect export.The control end of the 3rd switch element 139 is connected with load anode 310 as output plus terminal 310.The input of the 3rd switch element 139 connects the first power input VCC1.The output of the 3rd switch element 139 then with the first input end IN1 of detection module 120.In the course of work of lithium battery, when lithium battery energy shortage, even if load short circuits, namely export negative terminal 320 and be connected with output plus terminal 310, it produces pressure reduction and still may be not enough to make detection module 120 change output state.Therefore, by the 3rd switch element 139 is set can guarantees in load short circuits and electric current is less still available protecting is carried out to lithium battery.
In the present embodiment, the 3rd switch element 139 comprises switching tube, the second diode, the second resistance and the 3rd resistance.Wherein, the control end of switching tube is connected to the positive pole of the second diode, and the negative pole of the second diode is connected to output plus terminal 310, for being connected with load anode.The input of switching tube is connected with the first power input VCC1, the second resistance in parallel between the input of switching tube and output.The first input end IN1 of detection module 120 is connected to after output series connection the 3rd resistance of switching tube.In the present embodiment, switching tube can be PMOS, also can be PNP type triode.When load short circuits; output plus terminal 310 is connected with output negative terminal 320 and passes through to export negative terminal 320 ground connection; the voltage of switch controlled end is reduced; switching tube works; make detection module 120 export control signal, control the first switch element 134 conducting, and then ended by driver module 140 control switch module 150; disconnect and exporting, protection lithium battery is not by the destruction of short circuit.
As shown in Figure 1, in the present embodiment, short-circuit protection circuit of lithium battery also comprises delay circuit module 160.Delay circuit module 160 is arranged between the first input end IN1 of detection module 120 and sampling module 110.Delay circuit module 160 is for setting the protection voltage of lithium battery protection circuit and guard time or reconcile.In the present embodiment, delay circuit module 160 comprises delay capacitor and time delay resistance.Delay capacitor one end is connected to first input end IN1, other end ground connection.Time delay resistance then one end is connected to first input end IN1, and the other end is connected between switch module 150 and sampling module 110.
Detection module 110 also comprises the first sectional pressure element 124 and the second sectional pressure element 122.First sectional pressure element 124 is connected between the second input IN1 and sampling module 110, and the second sectional pressure element 122 is connected between the second input IN1 and the first power input VCC1.By the adjustment to the second sectional pressure element 122 and the first sectional pressure element 124, can regulate the input voltage of the second input, namely reference voltage be regulated.In the present embodiment by namely can realize the adjustment to short-circuit protection circuit of lithium battery parameter to the adjustment of sectional pressure element and delay circuit module 160, adjustment process is simple and easy to do, and practicality is stronger.In the present embodiment, the first sectional pressure element 124, second sectional pressure element 122 is divider resistance.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (10)
1. a short-circuit protection circuit of lithium battery, is characterized in that, comprising: sampling module, detection module, protection module, switch module and driver module;
Described sampling module and described switch module are series between cathode of lithium battery and load negative terminal; The control end of described switch module is connected to the output of described driver module;
Described detection module comprises first input end and the second input; Described sampling module is parallel between the first input end of described detection module and the second input; The first input end of described detection module and the second input distribute successively along the sense of current flowing through described sampling module; Described second input is also connected with the first power input; The output of described detection module is connected with described control unit;
Described protection module comprises control unit, the first switch element, second switch unit and feedback unit; The control end of described first switch element is connected with the output of described detection module, and the input of described first switch element is connected with the control end of described driver module, the output head grounding of described first switch element; The control end of described driver module is also connected with described control unit; Described detection module is used for exporting corresponding control signal according to the magnitude of voltage of described first input end and described second input, control conducting or the cut-off of described first switch element, and then controlled cut-off or the conducting of described switch module by described driver module; The control end of described second switch unit is connected to described control unit, and the input of described second switch unit is connected with the output of described detection module, the output head grounding of described second switch unit; The conducting when receiving the control signal that described control unit exports of described second switch unit, and then control described first switch element cut-off; Described feedback unit one end is connected to the output of described detection module, and the other end is connected to the first input end of described detection module, for maintaining the output of described detection module.
2. short-circuit protection circuit of lithium battery according to claim 1, is characterized in that, described feedback unit comprises the first resistance and the first diode; Described first resistance one end is connected to the output of described detection module, and the other end is connected with the positive pole of described first diode; The negative pole of described first diode is connected to the first input end of described detection module.
3. short-circuit protection circuit of lithium battery according to claim 1; it is characterized in that; described protection module also comprises the 3rd switch element; for in load short circuits and electric current is less time control described detection module export control signal; control described first switching means conductive, and then controlled the cut-off of described switch module by described driver module.
4. short-circuit protection circuit of lithium battery according to claim 3, is characterized in that, described 3rd switch element comprises switching tube, the second diode, the second resistance and the 3rd resistance; The control end of described switching tube connects the positive pole of described second diode; The negative pole of described second diode is connected with load anode; The input of described switching tube connects the first power input; Second resistance in parallel between the input of described switching tube and control end, is connected to the first input end of described detection module after output series connection the 3rd resistance of described switching tube.
5. short-circuit protection circuit of lithium battery according to claim 4, is characterized in that, described switching tube is PMOS or PNP type triode.
6. short-circuit protection circuit of lithium battery according to claim 1, is characterized in that, described first switch element and described second switch unit are metal-oxide-semiconductor or triode, and described switch module is then NMOS tube.
7. short-circuit protection circuit of lithium battery according to claim 1, is characterized in that, described control unit is single-chip microcomputer.
8. short-circuit protection circuit of lithium battery according to claim 1; it is characterized in that; described detection module comprises an integrated operational amplifier, and described first input end is the in-phase input end of described integrated operational amplifier, and described second input is the inverting input of described integrated operational amplifier.
9. short-circuit protection circuit of lithium battery according to claim 1, is characterized in that, also comprises delay circuit module, comprises delay capacitor and time delay resistance, and described delay capacitor one end is connected to the first input end of described detection module, other end ground connection; Described time delay resistance one end is connected to described first input end, and the other end is connected between described switch module and described sampling module.
10. short-circuit protection circuit of lithium battery according to claim 1, is characterized in that, described detection module also comprises the first sectional pressure element and the second sectional pressure element; Described first sectional pressure element is connected between described second input and described sampling module; Described second sectional pressure element is connected between described second input and described first power input.
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| CN201420476272.4U CN204156508U (en) | 2014-08-21 | 2014-08-21 | Short-circuit protection circuit of lithium battery |
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| CN201420476272.4U CN204156508U (en) | 2014-08-21 | 2014-08-21 | Short-circuit protection circuit of lithium battery |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113110019A (en) * | 2021-04-19 | 2021-07-13 | 珞石（北京）科技有限公司 | Universal multifunctional double-circuit redundant output circuit |
| CN113442847A (en) * | 2020-03-27 | 2021-09-28 | 比亚迪股份有限公司 | Fail-safe output circuit and vehicle-mounted controller |
| CN113984244A (en) * | 2021-10-22 | 2022-01-28 | 臻驱科技（上海）有限公司 | Protection circuit of motor temperature sampling interface, motor temperature sampling module and electric vehicle |
| CN114325418A (en) * | 2020-09-29 | 2022-04-12 | 三星Sdi株式会社 | Battery control device and short circuit detection method thereof |
| CN114523851A (en) * | 2022-02-25 | 2022-05-24 | 东莞市达锂电子有限公司 | Battery short-circuit protection device and electric vehicle battery management system |
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2014
- 2014-08-21 CN CN201420476272.4U patent/CN204156508U/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113442847A (en) * | 2020-03-27 | 2021-09-28 | 比亚迪股份有限公司 | Fail-safe output circuit and vehicle-mounted controller |
| CN113442847B (en) * | 2020-03-27 | 2023-11-14 | 比亚迪股份有限公司 | Fail-safe output circuit and vehicle-mounted controller |
| CN114325418A (en) * | 2020-09-29 | 2022-04-12 | 三星Sdi株式会社 | Battery control device and short circuit detection method thereof |
| CN113110019A (en) * | 2021-04-19 | 2021-07-13 | 珞石（北京）科技有限公司 | Universal multifunctional double-circuit redundant output circuit |
| CN113984244A (en) * | 2021-10-22 | 2022-01-28 | 臻驱科技（上海）有限公司 | Protection circuit of motor temperature sampling interface, motor temperature sampling module and electric vehicle |
| CN113984244B (en) * | 2021-10-22 | 2023-10-20 | 臻驱科技（上海）有限公司 | Protection circuit of motor temperature sampling interface, motor temperature sampling module and electric vehicle |
| CN114523851A (en) * | 2022-02-25 | 2022-05-24 | 东莞市达锂电子有限公司 | Battery short-circuit protection device and electric vehicle battery management system |
| CN114523851B (en) * | 2022-02-25 | 2024-03-12 | 东莞市达锂电子有限公司 | Battery short-circuit protection device and electric vehicle battery management system |
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Effective date of registration: 20151104 Address after: News 518034 Shenzhen Road, No. 1 Futian District, Guangdong Province in the information building 2 building building electric port Patentee after: SHENZHEN ZHONGDIAN INTERNATIONAL INFORMATION TECHNOLOGY CO., LTD. Address before: 518000, 8 floor, Yu Xiang building, Futian District overseas Chinese road, Shenzhen, Guangdong Patentee before: CHINA ELECTRONIC APPLIANCE (SHENZHEN) CO., LTD. |
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Address after: 518034 CLP port, 2nd floor, podium building, CLP information building, No.1 Xinwen Road, Futian District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Zhongdian Port Technology Co.,Ltd. Address before: 518034 CLP port, 2nd floor, podium building, CLP information building, No.1 Xinwen Road, Futian District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN CEC INTERNATIONAL INFORMATION TECHNOLOGY Co.,Ltd. |