CN205231808U - Mobile phone lithium battery protection circuit - Google Patents
Mobile phone lithium battery protection circuit Download PDFInfo
- Publication number
- CN205231808U CN205231808U CN201521089677.3U CN201521089677U CN205231808U CN 205231808 U CN205231808 U CN 205231808U CN 201521089677 U CN201521089677 U CN 201521089677U CN 205231808 U CN205231808 U CN 205231808U
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- battery
- pin
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- protection
- charge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model discloses a mobile phone lithium battery protection circuit, a serial communication port, include: positive input terminal P+, negative pole input P -, lithium battery protection chip U1, control of charge and discharge chip U2, battery positive electrode connecting end B+, battery negative -pole connecting terminal B -, identification port ID and temperature resistive port T. Adopting special control chip, effectively carrying out filling, crossing the protection of putting, overflowing to the lithium cell, working sensitivity is high, major loop on -state resistance is low and internal loss is low, through increasing identification resistance, the intelligent charging equipment of being convenient for provides optimalizing charging voltage and charging current, increase NTC in the protection circuit, in the not happening trouble and under the condition that generating temperature rises, provide the protection to the battery, guarantee that the battery does not take place the security problem.
Description
Technical field
The utility model relates to lithium battery technology, is specifically related to a kind of cellular li-ion battery protective circuit.
Background technology
Along with the development of the communication technology, mobile phone has become a part indispensable in a lot of people's daily life, and in order to obtain longer cruising time, mobile phone generally adopts rechargeable lithium battary as power supply.
Although rechargeable lithium battary has the advantages such as power supply capacity is high, power quality is light, but the chemical property of lithium battery is enlivened, reach the object of safe handling lithium battery, then need to monitor the operating state of lithium battery, prevent the situations such as lithium battery generation overcharge, overdischarge, excess temperature, short circuit, otherwise by the useful life of serious curtailment lithium battery, even cause security incident.
Utility model content
In view of problem existing in above-mentioned prior art; the purpose of this utility model is to provide a kind of cellular li-ion battery protective circuit; automatically lithium battery can be identified; to the electric current of lithium battery, voltage and temperature control and protection in addition; ensure the trouble free service of lithium battery, extend the useful life of lithium battery.
For achieving the above object, the utility model will be achieved through the following technical solutions:
Cellular li-ion battery protective circuit, it is characterized in that, comprise: electrode input end P+, negative input P-, Li battery protection IC U1, charge and discharge control chip U2, anode link B+, battery cathode link B-, identification port id and temperature and resistance port T, anode link B+ is connected with electrode input end P+, the VDD pin of described Li battery protection IC U1 is connected with anode link B+ by resistance R1, the VDD pin of Li battery protection IC U1 is connected with cathode of lithium battery link B-by electric capacity C1, the VSS pin of Li battery protection IC U1 is connected with battery cathode link B-, the V-pin of Li battery protection IC U1 is connected with negative input P-by resistance R2, the DO pin of Li battery protection IC U1 is connected with the G1 pin of charge and discharge control chip U2, the CO pin of Li battery protection IC U1 is connected with the G2 pin of charge and discharge control chip U2, the S1 pin of described charge and discharge control chip U2 is connected with battery cathode link B-, the S2 pin of charge and discharge control chip U2 is connected with negative input P-, D1 pin and the D2 pin of described charge and discharge control chip U2 are interconnected, electric capacity C2 is connected with between described electrode input end P+ and negative input P-, electric capacity C3 is connected with between the S1 pin of described charge and discharge control chip U2 and S2 pin, described identification port id is connected to negative input P-by resistance R3, described resistance R3 is also connected to electric capacity C4, described temperature and resistance port T is connected to negative input P-by NTC resistance, shown NTC resistance is also connected to electric capacity C5.
As preferably, described Li battery protection IC U1 is S-8261AAMMD-G2MT2U.
As preferably, described charge and discharge control chip U2 is AO6804AL.
The utility model has the following advantages and beneficial effect compared to existing technology:
Cellular li-ion battery protective circuit of the present utility model, adopt special integrated circuit, can effectively overcharge lithium battery, cross put, the protection of overcurrent, working sensitivity is high, major loop on state resistance is low and internal loss is low; By increasing identification resistance, being convenient to intelligent charge equipment provides optimum charging voltage and charging current; Increasing NTC in protective circuit, occurrence temperature rises when not breaking down, providing protection to battery, ensure that battery safety issue does not occur.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model cellular li-ion battery protective circuit.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment as shown in Figure 1, cellular li-ion battery protective circuit, it is characterized in that, comprise: electrode input end P+, negative input P-, Li battery protection IC U1, charge and discharge control chip U2, anode link B+, battery cathode link B-, identification port id and temperature and resistance port T, anode link B+ is connected with electrode input end P+, the VDD pin of described Li battery protection IC U1 is connected with anode link B+ by resistance R1, the VDD pin of Li battery protection IC U1 is connected with cathode of lithium battery link B-by electric capacity C1, the VSS pin of Li battery protection IC U1 is connected with battery cathode link B-, the V-pin of Li battery protection IC U1 is connected with negative input P-by resistance R2, the DO pin of Li battery protection IC U1 is connected with the G1 pin of charge and discharge control chip U2, the CO pin of Li battery protection IC U1 is connected with the G2 pin of charge and discharge control chip U2, the S1 pin of described charge and discharge control chip U2 is connected with battery cathode link B-, the S2 pin of charge and discharge control chip U2 is connected with negative input P-, D1 pin and the D2 pin of described charge and discharge control chip U2 are interconnected, electric capacity C2 is connected with between described electrode input end P+ and negative input P-, electric capacity C3 is connected with between the S1 pin of described charge and discharge control chip U2 and S2 pin, described identification port id is connected to negative input P-by resistance R3, described resistance R3 is also connected to electric capacity C4, described temperature and resistance port T is connected to negative input P-by NTC resistance, shown NTC resistance is also connected to electric capacity C5.
As preferably, described Li battery protection IC U1 is S-8261AAMMD-G2MT2U.
As preferably, described charge and discharge control chip U2 is AO6804AL.
Positive source, power cathode, discharge prevention actuating station, charge protection actuating station that pin VDD, VSS, DO, CO of Li battery protection IC U1 are respectively; single lithium battery is connected between B+ and B-; lithium battery realizes charging input and electric discharge output between P+ and P-; during charging; charger output voltage is connected between P+ and P-; B+ and B-of electric current from P+ to cell, then through control of discharge chip U2 to P-.In charging process, VDD and the VSS pin of Li battery protection IC U1 detects lithium battery voltage by R1, when the voltage of single lithium battery is more than 4.3V, the CO pin output signal of Li battery protection IC U1 makes pin G2 and S2 of charge and discharge control chip U2 turn off, lithium battery stops charging immediately, thus prevents lithium battery from damaging because of overcharge; In discharge process, VDD and the VSS pin of Li battery protection IC U1 detects lithium battery voltage by R1, when the voltage of single lithium battery drops to 2.3V, the DO pin output signal of Li battery protection IC U1 makes pin G1 and S1 of charge and discharge control chip U2 turn off, lithium battery stops electric discharge immediately, thus prevents lithium battery from damaging because of overdischarge; The V-pin of Li battery protection IC U1 is current detecting pin; V-and VSS pin detects the voltage at charge and discharge control chip U2 two ends by resistance R2; during output short-circuit; the conduction voltage drop of charge and discharge control chip U2 increases severely; V-pin voltage raises rapidly; the output signal of Li battery protection IC U1 makes pin G1 and S1 of charge and discharge control chip U2 turn off rapidly, thus realizes overcurrent or short-circuit protection.
Identification port id is connected to negative input P-by resistance R3; utilize the resistance of fixed resistance R3; control processor can distinguish whether lithium battery is the battery of specifying, and being convenient to intelligent charge equipment provides optimum charging voltage and charging current, reaches the object of protection battery.
Temperature and resistance port T is connected to negative input P-by NTC resistance, when battery operated, does not have to overcharge, crosses and put or the situation such as overcurrent, short circuit, but due to the operating time oversize, cause battery core temperature to rise very fast.NTC resistance is close to battery core monitoring battery core temperature, along with temperature rising NTC resistance declines, gradually when resistance drops to control processor set point; namely control processor sends shutdown command; battery is allowed to stop, to its power supply, only maintaining very little standby current, reaching the object of protection battery.
Above-described embodiment is the utility model preferably execution mode; but execution mode of the present utility model is not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.
Claims (3)
1. cellular li-ion battery protective circuit, it is characterized in that, comprise: electrode input end P+, negative input P-, Li battery protection IC U1, charge and discharge control chip U2, anode link B+, battery cathode link B-, identification port id and temperature and resistance port T, anode link B+ is connected with electrode input end P+, the VDD pin of described Li battery protection IC U1 is connected with anode link B+ by resistance R1, the VDD pin of Li battery protection IC U1 is connected with cathode of lithium battery link B-by electric capacity C1, the VSS pin of Li battery protection IC U1 is connected with battery cathode link B-, the V-pin of Li battery protection IC U1 is connected with negative input P-by resistance R2, the DO pin of Li battery protection IC U1 is connected with the G1 pin of charge and discharge control chip U2, the CO pin of Li battery protection IC U1 is connected with the G2 pin of charge and discharge control chip U2, the S1 pin of described charge and discharge control chip U2 is connected with battery cathode link B-, the S2 pin of charge and discharge control chip U2 is connected with negative input P-, D1 pin and the D2 pin of described charge and discharge control chip U2 are interconnected, electric capacity C2 is connected with between described electrode input end P+ and negative input P-, electric capacity C3 is connected with between the S1 pin of described charge and discharge control chip U2 and S2 pin, described identification port id is connected to negative input P-by resistance R3, described resistance R3 is also connected to electric capacity C4, described temperature and resistance port T is connected to negative input P-by NTC resistance, shown NTC resistance is also connected to electric capacity C5.
2. cellular li-ion battery protective circuit according to claim 1, is characterized in that: described Li battery protection IC U1 is S-8261AAMMD-G2MT2U.
3. cellular li-ion battery protective circuit according to claim 1, is characterized in that: described charge and discharge control chip U2 is AO6804AL.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521089677.3U CN205231808U (en) | 2015-12-24 | 2015-12-24 | Mobile phone lithium battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521089677.3U CN205231808U (en) | 2015-12-24 | 2015-12-24 | Mobile phone lithium battery protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205231808U true CN205231808U (en) | 2016-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521089677.3U Expired - Fee Related CN205231808U (en) | 2015-12-24 | 2015-12-24 | Mobile phone lithium battery protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205231808U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834670A (en) * | 2017-12-14 | 2018-03-23 | 惠州市盛微电子有限公司 | A kind of lithium battery protection circuit applied to mobile phone |
| CN109638903A (en) * | 2018-11-29 | 2019-04-16 | 北斗天地股份有限公司山东分公司 | A kind of battery and its protection circuit, intrinsic safety type smart phone |
| US11527883B2 (en) | 2017-09-23 | 2022-12-13 | Huawei Technologies Co., Ltd. | Power protection apparatus and terminal using the apparatus |
-
2015
- 2015-12-24 CN CN201521089677.3U patent/CN205231808U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11527883B2 (en) | 2017-09-23 | 2022-12-13 | Huawei Technologies Co., Ltd. | Power protection apparatus and terminal using the apparatus |
| CN107834670A (en) * | 2017-12-14 | 2018-03-23 | 惠州市盛微电子有限公司 | A kind of lithium battery protection circuit applied to mobile phone |
| CN109638903A (en) * | 2018-11-29 | 2019-04-16 | 北斗天地股份有限公司山东分公司 | A kind of battery and its protection circuit, intrinsic safety type smart phone |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20181224 |