CN208986655U - A kind of lithium battery protection circuit for protecting device using excess temperature, overcurrent protection - Google Patents
A kind of lithium battery protection circuit for protecting device using excess temperature, overcurrent protection Download PDFInfo
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- CN208986655U CN208986655U CN201822000301.0U CN201822000301U CN208986655U CN 208986655 U CN208986655 U CN 208986655U CN 201822000301 U CN201822000301 U CN 201822000301U CN 208986655 U CN208986655 U CN 208986655U
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Abstract
Excess temperature is used the utility model discloses a kind of, the lithium battery protection circuit of overcurrent protection protection device, including thermal-shutdown circuit, back-up protection circuit and control circuit, thermal-shutdown circuit is electrical connected with control circuit, the thermal-shutdown circuit includes thermistor R29, the control circuit includes main control chip, the main control chip includes the 13rd pin (TS pin) and the 7th pin (CHG pin), one end of the thermistor R29 is connected with the 13rd pin (TS pin) of main control chip, for collected temperature signal to be sent to main control chip, 7th pin (CHG pin) is for controlling the switch mosfet Q15 in charging circuit；The back-up protection circuit includes temperature fuse.The utility model can carry out dual reliably protecting to the charging process of lithium battery, avoid lithium battery from leading to overcharge since charger damages, cause charging current excessive, and then burn the risk of lithium battery.
Description
Technical field
It is especially a kind of that device is protected using excess temperature, overcurrent protection the utility model relates to battery technology field
Lithium battery protection circuit.
Background technique
Lithium battery has many advantages, such as that power supply capacity is high, power quality is light, to also be answered extensively as a kind of conventional batteries
With in various industries, still, the quality of lithium battery is full of uncertain factor, during the charging process there may be overcharge, fill
Situations such as electric overcurrent, not only influences whether the service life of lithium battery, it is also possible to cause damage base to instrument, or even overheat
And the phenomenon that exploding, jeopardize personal safety.
In conclusion providing a kind of reliable, the lithium battery that can adequately protect charging safety circuit, become this field skill
Art personnel's urgent problem to be solved.
Utility model content
In view of the deficiencies of the prior art, the utility model provides a kind of using excess temperature, overcurrent protection protection device
Lithium battery protection circuit, dual reliably protecting can be carried out to the charging process of lithium battery, avoid lithium battery due to charging
Device damages and leads to overcharge, causes charging current excessive, and then burn the risk of lithium battery.
The utility model solves its technical problem and adopts the following technical solutions to achieve:
A kind of lithium battery protection circuit for protecting device using excess temperature, overcurrent protection, charging end and discharge end are public
Same terminal, including thermal-shutdown circuit, back-up protection circuit and control circuit, thermal-shutdown circuit and control circuit electrical property phase
Even, the thermal-shutdown circuit includes thermistor R29, for carrying out charging overheat protector and the overheat protector that discharges, the control
Circuit processed includes main control chip, and the main control chip includes the 13rd pin (TS pin) and the 7th pin (CHG pin), described
One end of thermistor R29 is connected with the 13rd pin (TS pin) of main control chip, and the other end is connected with common, uses
In collected temperature signal is sent to main control chip, the MOSFET in the 7th pin (CHG pin) and charging circuit
The grid of switch Q15 is connected, and for controlling switch mosfet Q15, the switch mosfet Q15 is N-channel type MOS
Pipe；The back-up protection circuit includes temperature fuse, and the charging end of lithium battery charging circuit is arranged in the temperature fuse；
The control circuit includes timing module, and the timing module is electrical connected with main control chip, for being higher than charging pole to temperature
The duration for limiting temperature carries out timing.
Preferably, the temperature fuse is connected on the charging end of lithium battery charging circuit.
Preferably, the thermistor R29 uses NTC negative tempperature coefficient thermistor R29 device.
Preferably, the temperature fuse uses the Thermal Cutoffs of model E2F.
Preferably, described charging circuit one end is connected with control circuit, and the other end is connected with back-up protection circuit.
Compared with prior art, the utility model embodiment bring it is following the utility model has the advantages that
1, thermal-shutdown circuit includes thermistor R29, and thermistor R29 acquires the temperature of lithium battery, thermistor R29
One end be connected with the 13rd pin (TS pin) of main control chip, collected temperature signal can be sent to master control core
Piece, main control chip judge whether temperature reaches charging limit temperature, if temperature up to or over limiting temperature, and
Timing module carries out timing to the duration that temperature is higher than charging limit temperature, and the timing and continuous time is delayed more than temperature protection
Ts, then the 7th pin (CHG pin) of main control chip can control the switch mosfet Q15 in charging circuit, make
Seven pins (CHG pin) export high-impedance state, the power supply of charge circuit can be cut off, to ensure that the safety of charging.
2, back-up protection circuit includes temperature fuse, wherein temperature fuse is connected on filling for lithium battery charging circuit
Electric end, temperature fuse use the Thermal Cutoffs of model E2F, and when temperature meets or exceeds 102 DEG C, temperature fuse will
Fusing contacts with external circuit to cut off lithium battery, influences lithium battery (such as charger damage) by outside cause, right
Lithium battery protection circuit has carried out back-up protection physically, even if can also play guarantor in the case where light source of charger damage
Shield effect avoids lithium battery and leads since charger damages to carry out dual reliably protecting to lithium battery charging process
Overcharge is caused, causes charging current excessive, and then burn the risk of lithium battery.
3, due to charging end and the public same terminal of discharge end, and temperature fuse is connected on filling for lithium battery charging circuit
Electric end, thus when lithium battery discharge current it is excessive, cause temperature to increase, more than temperature fuse bearing temperature when, temperature fusing
Device will fuse, and contact to cut off lithium battery with external circuit, play the function of electric discharge overcurrent protection.
Detailed description of the invention
Fig. 1 is a kind of electricity for the lithium battery protection circuit that device is protected using excess temperature, overcurrent protection of the utility model
Road connects block diagram；
Fig. 2 is a kind of electricity for the lithium battery protection circuit that device is protected using excess temperature, overcurrent protection of the utility model
Road schematic diagram；
Fig. 3 is a kind of circuit that thermal-shutdown circuit in device is protected using excess temperature, overcurrent protection of the utility model
Schematic diagram；
Fig. 4, which is that the utility model is a kind of, protects master in the lithium battery protection circuit of device using excess temperature, overcurrent protection
Control the external pin schematic diagram of chip.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Fig. 1-4 is please referred to, a kind of embodiment provided by the utility model: a kind of to protect using excess temperature, overcurrent protection
The lithium battery protection circuit of device, charging end and the public same terminal of discharge end, including thermal-shutdown circuit, back-up protection circuit
And control circuit, thermal-shutdown circuit are electrical connected with control circuit, the thermal-shutdown circuit includes thermistor R29, is used
In carrying out charging overheat protector and the overheat protector that discharges, the control circuit includes main control chip, and the main control chip includes the
13 pins (TS pin) and the 7th pin (CHG pin), one end of the thermistor R29 and the 13rd of main control chip are drawn
Foot (TS pin) is connected, and the other end is connected with common, for collected temperature signal to be sent to main control chip, institute
It states the 7th pin (CHG pin) to be connected with the grid of the switch mosfet Q15 in charging circuit, for switch mosfet Q15
It is controlled, the switch mosfet Q15 is N-channel type metal-oxide-semiconductor；The back-up protection circuit includes temperature fuse, described
The charging end of lithium battery charging circuit is arranged in temperature fuse；The control circuit includes timing module, the timing module
It is electrical connected with main control chip, the duration for being higher than charging limit temperature to temperature carries out timing；The temperature fusing
Device is connected on the charging end of lithium battery charging circuit, and the thermistor R29 uses NTC negative tempperature coefficient thermistor R29 device,
The temperature fuse uses the Thermal Cutoffs of model E2F, the model SH367107 of the main control chip, the charging
Circuit on one side is connected with control circuit, and the other end is connected with back-up protection circuit.
Working principle: thermal-shutdown circuit includes thermistor R29, and thermistor R29 acquires the temperature of lithium battery, temperature-sensitive
One end of resistance R29 is connected with the 13rd pin (TS pin) of main control chip, can be sent to collected temperature signal
Main control chip, main control chip judges whether temperature reaches charging limit temperature, if temperature is up to or over the limit
Temperature (limiting temperature is less than 102 DEG C), and the duration that timing module is higher than charging limit temperature to temperature carries out timing,
The timing and continuous time is more than temperature protection delay Ts, then the 7th pin (CHG pin) of main control chip can be in charging circuit
Switch mosfet Q15 controlled, make the 7th pin (CHG pin) export high-impedance state, the power supply of charge circuit can be cut off,
To ensure that the safety of charging, wherein temperature protection is delayed Ts can be by carrying out programming progress to timing module
Setting；Back-up protection circuit includes temperature fuse, wherein and temperature fuse is connected on the charging end of lithium battery charging circuit,
Temperature fuse uses the Thermal Cutoffs of model E2F, and when temperature meets or exceeds 102 DEG C, temperature fuse will fuse,
It is contacted to cut off lithium battery with external circuit, back-up protection physically has been carried out to lithium battery protection circuit, even if
In the case that light source of charger damages, protective effect can be also played, lithium battery is made not influenced (such as charger damage by outside cause
It is bad), to carry out dual reliably protecting to lithium battery charging process, avoid lithium battery caused since charger damages
Charging, causes charging current excessive, and then burn the risk of lithium battery；Due to charging end and the public same terminal of discharge end, and
Temperature fuse is connected on the charging end of lithium battery charging circuit, therefore when lithium battery discharge current is excessive, cause temperature to increase, surpasses
When the bearing temperature of excess temperature fuse, temperature fuse will fuse, and contact, rise with external circuit to cut off lithium battery
The function of electric discharge overcurrent protection is arrived.
Thermistor R29 uses NTC negative tempperature coefficient thermistor R29 device, and thermal resistor belongs to a kind of semiconductor device
Part, typical feature be it is temperature sensitive, different resistance values, negative temperature coefficient thermistor are shown at a temperature of different
(NTC) when temperature is higher, resistance value is lower, thus converts resistance signal for temperature signal；Wherein, NTC negative temperature coefficient heat
Quick resistance R29 device is to be fabricated using metal oxides such as manganese, cobalt, nickel and copper as main material using ceramic process, these
Metal oxide materials all have semiconductor property, and the semiconductor materials such as all fours germanium, silicon, temperature are low on electrically conducting manner
When, carrier (electronics and hole) number of these oxide materials is few, so its resistance value is higher, as the temperature rises,
Carrier number will gradually increase, so resistance value can reduce, NTC negative tempperature coefficient thermistor R29 device is at room temperature
For variation range in 10O~1000000 ohm, temperature coefficient is -2%~-6.5%.
Finally, it should be noted that embodiment described above, only specific embodiment of the present utility model, to illustrate this
The technical solution of utility model, rather than its limitations, the protection scope of the utility model is not limited thereto, although referring to aforementioned
The utility model is described in detail in embodiment, those skilled in the art should understand that: it is any to be familiar with this skill
The technical staff in art field within the technical scope disclosed by the utility model, still can be to skill documented by previous embodiment
Art scheme modify or can readily occur in variation or equivalent replacement of some of the technical features；And these modifications,
Variation or replacement, the spirit and model of the utility model embodiment technical solution that it does not separate the essence of the corresponding technical solution
It encloses, should be covered within the scope of the utility model.Therefore, the protection scope of the utility model should be wanted with the right
Subject to the protection scope asked.
Claims (5)
1. a kind of using excess temperature, the lithium battery protection circuit of overcurrent protection protection device, charging end and discharge end are public same
One terminal, which is characterized in that including thermal-shutdown circuit, back-up protection circuit and control circuit, thermal-shutdown circuit and control
Circuit is electrical connected, and the thermal-shutdown circuit includes thermistor R29, for carrying out charging overheat protector and the excess temperature guarantor that discharges
Shield, the control circuit includes main control chip, and the main control chip includes the 13rd pin (TS pin) and the 7th pin (CHG
Pin), one end of the thermistor R29 is connected with the 13rd pin (TS pin) of main control chip, the other end with it is public
Ground terminal is connected, for collected temperature signal to be sent to main control chip, the 7th pin (CHG pin) and charging circuit
In switch mosfet Q15 grid be connected, for controlling switch mosfet Q15, the switch mosfet Q15 be N
Channel-type metal-oxide-semiconductor；The back-up protection circuit includes temperature fuse, and the temperature fuse is arranged in lithium battery charging circuit
Charging end；The control circuit includes timing module, and the timing module is electrical connected with main control chip, for temperature height
Timing is carried out in the duration of charging limit temperature.
2. a kind of lithium battery protection circuit that device is protected using excess temperature, overcurrent protection according to claim 1,
It is characterized in that, the temperature fuse is connected on the charging end of lithium battery charging circuit.
3. a kind of lithium battery protection circuit that device is protected using excess temperature, overcurrent protection according to claim 1,
It is characterized in that, the thermistor R29 uses NTC negative tempperature coefficient thermistor R29 device.
4. a kind of lithium battery protection circuit that device is protected using excess temperature, overcurrent protection according to claim 1,
It is characterized in that, the temperature fuse uses the Thermal Cutoffs of model E2F.
5. a kind of lithium battery protection circuit that device is protected using excess temperature, overcurrent protection according to claim 1,
It is characterized in that, described charging circuit one end is connected with control circuit, and the other end is connected with back-up protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822000301.0U CN208986655U (en) | 2018-11-30 | 2018-11-30 | A kind of lithium battery protection circuit for protecting device using excess temperature, overcurrent protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822000301.0U CN208986655U (en) | 2018-11-30 | 2018-11-30 | A kind of lithium battery protection circuit for protecting device using excess temperature, overcurrent protection |
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| CN208986655U true CN208986655U (en) | 2019-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822000301.0U Active CN208986655U (en) | 2018-11-30 | 2018-11-30 | A kind of lithium battery protection circuit for protecting device using excess temperature, overcurrent protection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600471A (en) * | 2020-06-10 | 2020-08-28 | 杰华特微电子（杭州）有限公司 | Over-temperature protection circuit and over-temperature protection method for switching power supply |
-
2018
- 2018-11-30 CN CN201822000301.0U patent/CN208986655U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600471A (en) * | 2020-06-10 | 2020-08-28 | 杰华特微电子（杭州）有限公司 | Over-temperature protection circuit and over-temperature protection method for switching power supply |
| CN111600471B (en) * | 2020-06-10 | 2023-07-18 | 杰华特微电子股份有限公司 | Over-temperature protection circuit and over-temperature protection method for switching power supply |
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