CN202840490U - Lithium battery protective circuit and device - Google Patents
Lithium battery protective circuit and device Download PDFInfo
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- CN202840490U CN202840490U CN 201220384740 CN201220384740U CN202840490U CN 202840490 U CN202840490 U CN 202840490U CN 201220384740 CN201220384740 CN 201220384740 CN 201220384740 U CN201220384740 U CN 201220384740U CN 202840490 U CN202840490 U CN 202840490U
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- lithium battery
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- ion cell
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Abstract
The utility model provides a lithium battery protective circuit and a device. The lithium battery protective circuit comprises a first switch tube, a second switch tube, a miner light and at least a lithium battery which are mutually connected in series. In addition, each lithium battery is connected in parallel with a lithium battery protection IC. The lithium battery protective circuit also comprises an equalizing circuit which is connected in parallel to two ends of each lithium battery. The equalizing circuit comprises a comparator, a resistor and a switch tube. A first input end of the comparator is connected with one end of a corresponding lithium battery, and a second input end of the compactor is respectively connected with the other end of the corresponding lithium battery and one end of the resistor. An output end of the compactor is connected with a control end of the switch tube in the equalizing circuit. A drain electrode of the switch tube in the equalizing circuit is connected with the other end of the resistor, and a source electrode of the switch tube is connected with a first input end of the corresponding lithium battery protection IC. By the utilization of the scheme provided by the utility model, protection of lithium batteries can be realized, and further safety performance of the lithium battery miner light is raised.
Description
Technical field
The utility model relates to electricity field, relates in particular a kind of lithium battery protection circuit and device.
Background technology
Along with the arrival in electronic information epoch, people are also increasing fast to the demand of portable power source.Such as lead-acid battery, the advantage such as lithium battery has high voltage, high power capacity, has extended cycle life, security performance is good is widely used in a plurality of fields such as portable electric appts, electric automobile, national defense industry.
Wherein, in the mining industry field, because lithium battery has and exceeds 2 ~ 4 times of plumbic acid mine lamps useful life, capacity is higher than the capacity of the lead-acid battery of equal quality, and the more high advantage of light intensity, so that lithium cell mine lamp progressively replaces the plumbic acid mine lamp.
Usually; the lithium cell mine lamp of available technology adopting is to realize control to lithium battery by the mode with li-ion cell protection IC cascade; as shown in Figure 1; wherein; lithium battery string (B1-B10) and the first switching tube Q01; second switch pipe Q02 and mine lamp L connect mutually; and each lithium battery all and be connected to a lithium battery Management IC; each li-ion cell protection IC(integrated circuit; integrated circuit) charging control output end (Charge Out; CO) all link to each other with the control end of the first switching tube Q01; the control of discharge output of each li-ion cell protection IC (Discharge Out, DO) all links to each other with the control end of second switch pipe Q02.
But; because lithium battery is more active; lithium cell mine lamp of the prior art does not possess excess temperature and owes the safety guards such as temperature protection, electric weight demonstration, so the poor safety performance of lithium cell mine lamp, and the fail safe that how to improve lithium cell mine lamp becomes industry and demands improved target urgently.
The utility model content
In view of this, the utility model provides a kind of lithium battery protection circuit and device, has effectively solved lithium cell mine lamp in the prior art owing to the problem that does not possess safety guard and cause poor safety performance.
For achieving the above object, the utility model provides following technical scheme:
A kind of lithium battery protection circuit comprises the first switching tube, second switch pipe, mine lamp and at least one lithium battery of mutual series connection, and each lithium battery is all and be connected to a li-ion cell protection IC, and described lithium battery protection circuit also comprises:
Be connected in parallel on the equalizing circuit at the two ends of each described lithium battery, described equalizing circuit comprises: comparator, resistance and switching tube;
Wherein, the first input end of described comparator links to each other with an end of corresponding lithium battery, the second input of described comparator links to each other with the other end of corresponding lithium battery and an end of resistance respectively, and the output of described comparator links to each other with the control end of switching tube in the described equalizing circuit;
The drain electrode of switching tube links to each other with the other end of described resistance in the described equalizing circuit, and the source electrode of switching tube links to each other with the first input end of corresponding described li-ion cell protection IC in the described equalizing circuit.
Wherein, described lithium battery protection circuit also comprises:
Be serially connected between the control end of the common port of CO end of each described li-ion cell protection IC and described the first switching tube, under charged state, when the temperature that detects the place branch road disconnects during greater than the first preset temperature, when the first temperature switch of the temperature that detects place branch road closure during less than the second preset temperature;
Be serially connected between the control end of the common port of DO end of each described li-ion cell protection IC and described second switch pipe; under discharge condition; when the temperature that detects the place branch road disconnects during greater than the 3rd preset temperature, when the second temperature switch of the temperature that detects place branch road closure during less than the 4th preset temperature.
Wherein, described lithium battery protection circuit also comprises:
Be serially connected between described lithium battery and the described mine lamp, show the electric quantity display device of the electric weight of described lithium battery.
Wherein, the described li-ion cell protection IC li-ion cell protection IC that is S-8241, S-8211 or S-8261.
Wherein, described switching tube is N-shaped mos pipe.
Accordingly, the utility model also provides a kind of lithium cell protecting device, comprises shell and any one lithium battery protection circuit provided by the utility model.
Via above-mentioned technical scheme as can be known, lithium battery protection circuit provided by the utility model and device are planted, and are parallel with the equalizing circuit that comprises comparator, resistance and switching tube at the two ends of each lithium battery; Under charged state, the voltage at comparator sampling lithium battery two ends, and voltage and the predeterminated voltage that collects compared, when the voltage that collects during greater than predeterminated voltage, export a high level, at this moment, switching tube is opened in the equalizing circuit, and CO end output one low level of control li-ion cell protection IC is controlled the first switching tube and closed, the over-charge protective function is played in the charge circuit cut-off; Under discharge condition; the voltage at comparator sampling lithium battery two ends; and voltage and the predeterminated voltage that collects compared, when the voltage that collects during greater than predeterminated voltage, export a high level; at this moment; switching tube is opened in the equalizing circuit, DO end output one low level of control li-ion cell protection IC, and control second switch pipe is closed; the Cross prevention function is played in the discharge loop cut-off.As seen, can realize protection to lithium battery by utilizing scheme that the utility model provides, and then improve the security performance of lithium cell mine lamp.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to the accompanying drawing that provides other accompanying drawing.
Fig. 1 is the circuit diagram of lithium cell mine lamp in the prior art;
The electrical block diagram of a kind of lithium battery protection circuit that Fig. 2 provides for the utility model;
Another electrical block diagram of a kind of lithium battery protection circuit that Fig. 3 provides for the utility model.
Embodiment
In order effectively to solve lithium cell mine lamp in the prior art owing to the problem that does not possess safety guard and cause poor safety performance, the utility model provides a kind of lithium battery protection circuit and device.
The below at first is introduced a kind of lithium battery protection circuit provided by the utility model.
A kind of lithium battery protection circuit comprises the first switching tube, second switch pipe, mine lamp and at least one lithium battery of mutual series connection, and each lithium battery is all and be connected to a li-ion cell protection IC, and described lithium battery protection circuit also comprises:
Be connected in parallel on the equalizing circuit at the two ends of each described lithium battery, described equalizing circuit comprises: comparator, resistance and switching tube;
Wherein, the first input end of described comparator links to each other with an end of corresponding lithium battery, the second input of described comparator links to each other with the other end of corresponding lithium battery and an end of resistance respectively, and the output of described comparator links to each other with the control end of switching tube in the described equalizing circuit;
The drain electrode of switching tube links to each other with the other end of described resistance in the described equalizing circuit, and the source electrode of switching tube links to each other with the first input end of corresponding described li-ion cell protection IC in the described equalizing circuit.
In lithium battery protection circuit provided by the utility model and the device, be parallel with the equalizing circuit that comprises comparator, resistance and switching tube at the two ends of each lithium battery; Under charged state, the voltage at comparator sampling lithium battery two ends, and voltage and the predeterminated voltage that collects compared, when the voltage that collects during greater than predeterminated voltage, export a high level, at this moment, switching tube is opened in the equalizing circuit, and CO end output one low level of control li-ion cell protection IC is controlled the first switching tube and closed, the over-charge protective function is played in the charge circuit cut-off; Under discharge condition; the voltage at comparator sampling lithium battery two ends; and voltage and the predeterminated voltage that collects compared, when the voltage that collects during greater than predeterminated voltage, export a high level; at this moment; switching tube is opened in the equalizing circuit, DO end output one low level of control li-ion cell protection IC, and control second switch pipe is closed; the Cross prevention function is played in the discharge loop cut-off.As seen, can realize protection to lithium battery by utilizing scheme that the utility model provides, and then improve the security performance of lithium cell mine lamp.
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
The electrical block diagram of a kind of lithium battery protection circuit that Fig. 2 provides for the utility model embodiment.Wherein, this lithium battery protection circuit comprise the first switching tube Q01, second switch pipe Q02, mine lamp L of mutual series connection and ten lithium batteries (B1 ~ B10), and each lithium battery is all and be connected to a li-ion cell protection IC, this lithium battery protection circuit also comprises:
Be connected in parallel on the equalizing circuit at the two ends of each described lithium battery, described equalizing circuit comprises: comparator, resistance and switching tube;
Wherein, the first input end of described comparator links to each other with an end of corresponding lithium battery, the second input of described comparator links to each other with the other end of corresponding lithium battery and an end of resistance respectively, and the output of described comparator links to each other with the control end of switching tube in the described equalizing circuit;
The drain electrode of switching tube links to each other with the other end of described resistance in the described equalizing circuit, and the source electrode of switching tube links to each other with the first input end of corresponding described li-ion cell protection IC in the described equalizing circuit.
10 li-ion cell protection IC(IC1-IC10) and 10 equalizing circuits as shown in Figure 2, lithium battery protection circuit provided by the utility model includes:; Wherein, 10 equalizing circuits comprise altogether: 10 resistance (R1-R10), 10 comparators (U1-U10) and 10 switching tubes (Q1-Q10).And because the structure of each equalizing circuit is identical; and each lithium battery, equalizing circuit and li-ion cell protection IC are one-to-one relationship; now in conjunction with Fig. 2, take an equalizing circuit corresponding to lithium battery B1 as example, the equalizing circuit in this lithium battery protection circuit is described in detail.
Concrete, equalizing circuit can comprise in this lithium battery protection circuit: comparator U1, resistance R 1 and switching tube Q1; Wherein, the annexation of each device is:
The first input end of comparator U1 links to each other with the end of lithium battery B1; the second input of comparator U1 links to each other with the other end of lithium battery B1 and an end of resistance R 1 respectively; the output of comparator U1 links to each other with the control end of switching tube Q1; the drain electrode of switching tube Q1 links to each other with the other end of resistance R 1, and the source electrode of switching tube Q1 links to each other with the first input end of corresponding li-ion cell protection IC1.
Its operation principle is: under charged state; the voltage at comparator U1 sampling lithium battery B1 two ends; and voltage and the predeterminated voltage that collects compared, when the voltage that collects during greater than predeterminated voltage, export a high level; at this moment; switching tube Q1 opens, and CO end output one low level of control li-ion cell protection IC1 is controlled the first switching tube Q01 and closed; the over-charge protective function is played in the charge circuit cut-off.
In like manner; under discharge condition, the voltage at comparator U1 sampling lithium battery B 1 two ends, and voltage and the predeterminated voltage that collects compared; when the voltage that collects during greater than predeterminated voltage; export a high level, at this moment, switching tube Q1 opens; DO end output one low level of control li-ion cell protection IC1; control second switch pipe Q02 closes, and the Cross prevention function is played in the discharge loop cut-off.
As seen, can realize protection to lithium battery by utilizing lithium battery protection circuit provided by the utility model, and then improve the security performance of lithium cell mine lamp.
Preferably, as shown in Figure 3, the lithium battery protection circuit that the utility model provides can also comprise the first temperature switch K1 and the second temperature switch K2;
Wherein, the first temperature switch K1 is serially connected between the control end of the common port of CO end of each described li-ion cell protection IC and described the first switching tube Q01, under charged state, when the temperature that detects the place branch road disconnects during greater than the first preset temperature, when the temperature that detects the place branch road closed during less than the second preset temperature;
The second temperature switch K2 is serially connected between the control end of the common port of DO end of each described li-ion cell protection IC and described second switch pipe Q02; under discharge condition; when the temperature that detects the place branch road disconnects during greater than the 3rd preset temperature, when the temperature that detects the place branch road closed during less than the 4th preset temperature.
Its operation principle is:
In charging process, after battery temperature reaches the first preset temperature, the first temperature switch K1 disconnects, the first switching tube Q01 charging control valve is closed, and the charge circuit cut-off is after temperature is reduced to the second preset temperature, the first temperature switch K1 is closed, the first switching tube Q01 charging control valve is opened, and charge circuit is connected, and starts like this charging temperature defencive function;
In discharge process; after battery temperature reaches the 3rd preset temperature; the second temperature switch K2 disconnects; second switch pipe Q02 control of discharge pipe is closed, and the discharge loop cut-off is after temperature is reduced to the 4th preset temperature; the second temperature switch K2 is closed; second switch pipe Q02 control of discharge pipe is opened, and discharge loop is connected, and starts like this discharge temp defencive function.
Those skilled in the art are understandable that, described the first preset temperature can be 50 °, and described the second preset temperature can be 45 °, and described the 3rd preset temperature can be 70 °, and described the 4th preset temperature can be 65 °.Obviously, according to without actual demand, preset temperature is the value that can regulate, is not described in detail in this.
Preferably, described li-ion cell protection IC can be the li-ion cell protection IC of S-8241, S-8211 or S-8261.
Further, lithium battery protection circuit provided by the utility model can also comprise electric quantity display device, and it is serially connected in lithium battery, and (B1 ~ B10) and between the mine lamp L is used for showing the electric weight of described lithium battery.
Need to prove, electric quantity display device of a great variety do not enumerated one by one at this, now enumerates a specific implementation: use the voltage power supply mode; Wherein, this electric quantity display device can comprise 3 LED light, is respectively red LED lamp, yellow LED lamp and green LED lamp, indicates the electric weight residue by the light on and off of LED lamp; Wherein, full explanation dump energy 〉=85% when bright of definition red LED lamp, yellow LED lamp, green LED lamp; Red LED lamp, yellow LED lamp are bright, when green LED lamp is gone out, dump energy 〉=50% are described; Red LED lamp is bright, and yellow LED lamp is gone out, and when green LED lamp is gone out, dump energy 〉=25% is described; When red LED lamp, yellow LED lamp, green LED lamp are gone out entirely, dump energy≤25% is described.Need to prove, above-mentioned electric weight display mode should not consist of restriction of the present utility model as just a kind of example.
Further, lithium battery protection circuit provided by the utility model also provides short-circuit protection function, when regular picture, when VM detect discharging current greater than set point after, the DO output low level of IC1, overcurrent protection function is played in the discharge loop cut-off like this; Fail safe and lithium battery life-span for lithium battery applications improve a lot.
As seen, lithium battery protection circuit provided by the utility model can effectively solve lithium cell mine lamp in the prior art owing to the problem that does not possess safety guard and cause poor safety performance.
Accordingly, the utility model also provides a kind of lithium cell protecting device, comprises any lithium battery protection circuit in shell and above-described embodiment.By utilizing lithium cell protecting device provided by the utility model, can effectively solve lithium cell mine lamp in the prior art owing to the problem that does not possess safety guard and cause poor safety performance.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the device that embodiment provides, because it is corresponding with the method that embodiment provides, so description is fairly simple, relevant part partly illustrates referring to method and gets final product.
Above-mentioned explanation to the embodiment that provides makes this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from spirit or scope of the present utility model, in other embodiments realization.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but principle and the features of novelty the widest consistent scope that provides with this paper will be provided.
Claims (6)
1. lithium battery protection circuit comprises the first switching tube, second switch pipe, mine lamp and at least one lithium battery of mutual series connection, and each lithium battery is all and be connected to a li-ion cell protection IC, it is characterized in that, also comprises:
Be connected in parallel on the equalizing circuit at the two ends of each described lithium battery, described equalizing circuit comprises: comparator, resistance and switching tube;
Wherein, the first input end of described comparator links to each other with an end of corresponding lithium battery, the second input of described comparator links to each other with the other end of corresponding lithium battery and an end of resistance respectively, and the output of described comparator links to each other with the control end of switching tube in the described equalizing circuit;
The drain electrode of switching tube links to each other with the other end of described resistance in the described equalizing circuit, and the source electrode of switching tube links to each other with the first input end of corresponding described li-ion cell protection IC in the described equalizing circuit.
2. lithium battery protection circuit according to claim 1 is characterized in that, also comprises:
Be serially connected between the control end of the common port of CO end of each described li-ion cell protection IC and described the first switching tube, under charged state, when the temperature that detects the place branch road disconnects during greater than the first preset temperature, when the first temperature switch of the temperature that detects place branch road closure during less than the second preset temperature;
Be serially connected between the control end of the common port of DO end of each described li-ion cell protection IC and described second switch pipe; under discharge condition; when the temperature that detects the place branch road disconnects during greater than the 3rd preset temperature, when the second temperature switch of the temperature that detects place branch road closure during less than the 4th preset temperature.
3. lithium battery protection circuit according to claim 1 is characterized in that, also comprises:
Be serially connected between described lithium battery and the described mine lamp, show the electric quantity display device of the electric weight of described lithium battery.
4. lithium battery protection circuit according to claim 1 is characterized in that, the li-ion cell protection IC that described li-ion cell protection IC is S-8241, S-8211 or S-8261.
5. lithium battery protection circuit according to claim 1 is characterized in that, described switching tube is N-shaped mos pipe.
6. a lithium cell protecting device is characterized in that, comprising:
Shell and such as each described lithium battery protection circuit among the claim 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220384740 CN202840490U (en) | 2012-08-03 | 2012-08-03 | Lithium battery protective circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220384740 CN202840490U (en) | 2012-08-03 | 2012-08-03 | Lithium battery protective circuit and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202840490U true CN202840490U (en) | 2013-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220384740 Expired - Lifetime CN202840490U (en) | 2012-08-03 | 2012-08-03 | Lithium battery protective circuit and device |
Country Status (1)
| Country | Link |
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| CN (1) | CN202840490U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591574A (en) * | 2016-07-08 | 2018-01-16 | 朱建浩 | The protection device of lithium battery |
| CN109546235A (en) * | 2018-10-09 | 2019-03-29 | 深圳欣旺达智能科技有限公司 | Control method, device, electronic equipment and the storage medium of lithium battery |
| CN113741284A (en) * | 2021-09-06 | 2021-12-03 | 深圳市蓝丝腾科技有限公司 | Household intelligent supervision system |
-
2012
- 2012-08-03 CN CN 201220384740 patent/CN202840490U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591574A (en) * | 2016-07-08 | 2018-01-16 | 朱建浩 | The protection device of lithium battery |
| CN109546235A (en) * | 2018-10-09 | 2019-03-29 | 深圳欣旺达智能科技有限公司 | Control method, device, electronic equipment and the storage medium of lithium battery |
| CN113741284A (en) * | 2021-09-06 | 2021-12-03 | 深圳市蓝丝腾科技有限公司 | Household intelligent supervision system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
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Granted publication date: 20130327 |