CN211981480U - Short circuit is turn-off circuit and lithium electricity battery package with higher speed - Google Patents
Short circuit is turn-off circuit and lithium electricity battery package with higher speed Download PDFInfo
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- CN211981480U CN211981480U CN202020312797.XU CN202020312797U CN211981480U CN 211981480 U CN211981480 U CN 211981480U CN 202020312797 U CN202020312797 U CN 202020312797U CN 211981480 U CN211981480 U CN 211981480U
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Abstract
The utility model relates to the technical field of electronic circuit, specifically disclose a short circuit shutoff circuit and lithium electricity battery package with higher speed, shutoff control module includes field effect transistor Q1, the positive pole of lithium electricity battery package is connected to field effect transistor Q1 'S D end, field effect transistor Q1' S G end is connected with resistance R4, resistance R4 is connected with resistance R1 and resistance R2, resistance R1 is connected with the AFE chip, resistance R2 connects field effect transistor Q1 'S S end, field effect transistor Q1' S S end is connected the output positive end; the turn-off acceleration module comprises a voltage stabilizing diode Z1, a first switch unit and a second switch unit; the D end of the field effect transistor Q1 is connected with a voltage stabilizing diode Z1, a voltage stabilizing diode Z1 is connected with a first switch unit, the first switch unit is connected with a second switch unit and an output positive end, the second switch unit is connected with a resistor R2 in parallel, and the second switch unit is connected with GND; the negative electrode of the lithium battery pack is connected with a resistor R3 and a GND, and the resistor R3 is connected with the output negative terminal; the utility model discloses it is long when greatly shortening field effect transistor's closing, effectively avoided appearing the breakdown and burn out the scheduling problem.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a short circuit turns off circuit and lithium electricity battery package with higher speed.
Background
With the development of science and technology and the improvement of living standard, more and more electric motorcycles are favored by the market. In order to improve the endurance mileage, the maximum power and the like of the electric motorcycle, a large-capacity lithium battery pack is more and more widely applied to a power system of the electric motorcycle. Therefore, it is important to ensure the safety of the large-capacity lithium battery pack, especially the safety of the battery pack when the output end is short-circuited.
However, when the output end of most of large-capacity lithium battery packs is short-circuited, because the short-circuit current is very large, the closing time of the field effect tube is long, the resistance in the field effect tube is increased and the field effect tube generates heat in the closing process, so that the field effect tube is broken down and burnt, and the like, so that potential safety hazards exist in the large-capacity lithium battery packs, secondary use cannot be realized, and energy waste is caused.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model provides a short circuit is turn-off circuit and lithium electricity battery package with higher speed has greatly shortened when closing of field effect transistor, has effectively avoided appearing the breakdown and has burnt the scheduling problem, realizes the secondary of large capacity lithium electricity battery package and uses, effective energy saving.
In order to solve the technical problem, the utility model provides a concrete scheme as follows:
a short-circuit accelerated turn-off circuit is applied to a lithium battery pack and comprises a turn-off control module and a turn-off acceleration module;
the turn-off control module comprises a field effect transistor Q1, the D end of the field effect transistor Q1 is connected with the anode of the lithium battery pack, the G end of the field effect transistor Q1 is connected with a resistor R4, the resistor R4 is connected with a resistor R1 and a resistor R2, the resistor R1 is connected with an AFE chip, the resistor R2 is connected with the S end of the field effect transistor Q1, and the S end of the field effect transistor Q1 is connected with the positive output end;
the turn-off acceleration module comprises a voltage stabilizing diode Z1, a first switch unit and a second switch unit;
the D end of the field effect transistor Q1 is connected with a voltage stabilizing diode Z1, the voltage stabilizing diode Z1 is connected with a first switch unit, the first switch unit is connected with a second switch unit and an output positive end, the second switch unit is connected with a resistor R2 in parallel, and the second switch unit is connected with GND;
the negative pole of lithium electricity battery package is connected with resistance R3 and connects GND, output negative terminal is connected to resistance R3.
Optionally, the first switching unit includes a transistor Q2, a resistor R5, and a capacitor C1;
the E end of the triode Q2 is connected with a voltage stabilizing diode Z1, the C end of the triode Q2 is connected with the second switch unit, the B end of the triode Q2 is connected with a resistor R5, the resistor R5 is connected with a capacitor C1, and the capacitor C1 is connected with the positive output end; the parameters of the resistor R5 and the capacitor C1 are set to ensure that the charging time of the capacitor C1 lasts until the potential of the positive output terminal is changed from positive potential to negative potential.
Optionally, the first switch unit further includes a resistor R9, the resistor R9 is disposed between the B terminal of the transistor Q2 and the E terminal of the transistor Q2, and the resistor R9 can prevent the E terminal or the B terminal of the transistor Q2 from being interfered to cause the malfunction of the diode Q2.
Optionally, the second switching unit includes a transistor Q3 and a resistor R6;
the E end of the triode Q3 and the C end of the triode Q3 are respectively connected to two ends of the resistor R2, the B end of the triode Q3 is connected with the resistor R6, and the resistor R6 is connected with the first switch unit.
Optionally, the second switch unit further includes a resistor R8, the resistor R8 is disposed between the B terminal of the transistor Q3 and the E terminal of the transistor Q3, and the resistor R8 can prevent the E terminal or the B terminal of the transistor Q3 from being interfered to cause the malfunction of the diode Q3.
Optionally, the second switch unit further includes a resistor R7 and a diode D1, the terminal B of the transistor Q3 is connected to the resistor R7, the resistor R7 is connected to the diode D1, the diode D1 is connected to GND, and when the positive output terminal is at a positive potential, the diode D1 blocks the influence of GND on the potential at the terminal B of the transistor Q3 through the resistor R7, that is, the influence of GND on the conduction of the transistor Q3 when the positive output terminal is at a positive potential is eliminated.
The utility model also provides a lithium electricity battery package, turn-off circuit including above-mentioned short circuit with higher speed.
Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model provides a pair of short circuit turn-off circuit with higher speed has greatly shortened when closing of field effect transistor, has effectively avoided appearing the breakdown and has burnt the scheduling problem, realizes the secondary use of large capacity lithium electricity battery package, effective energy saving.
Drawings
Fig. 1 is a schematic diagram of a short circuit control circuit in the prior art.
Fig. 2 is a schematic diagram of a short-circuit accelerated turn-off circuit provided in an embodiment of the present invention.
Fig. 3 is a schematic block diagram of a lithium battery pack provided in an embodiment of the present invention.
Wherein, 1 is a short-circuit accelerated turn-off circuit; and 2, a lithium battery pack.
Detailed Description
In order to explain the technical solution of the present invention in detail, the following will combine the drawings of the embodiments of the present invention to perform clear and complete description on the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
For example, the short-circuit accelerated shutdown circuit is applied to a lithium battery pack and comprises a shutdown control module and a shutdown acceleration module; the turn-off control module comprises a field effect transistor Q1, the D end of the field effect transistor Q1 is connected with the anode of the lithium battery pack, the G end of the field effect transistor Q1 is connected with a resistor R4, the resistor R4 is connected with a resistor R1 and a resistor R2, the resistor R1 is connected with an AFE chip, the resistor R2 is connected with the S end of the field effect transistor Q1, and the S end of the field effect transistor Q1 is connected with the positive output end; the turn-off acceleration module comprises a voltage stabilizing diode Z1, a first switch unit and a second switch unit; the D end of the field effect transistor Q1 is connected with a voltage stabilizing diode Z1, the voltage stabilizing diode Z1 is connected with a first switch unit, the first switch unit is connected with a second switch unit and an output positive end, the second switch unit is connected with a resistor R2 in parallel, and the second switch unit is connected with GND; the negative pole of lithium electricity battery package is connected with resistance R3 and connects GND, output negative terminal is connected to resistance R3.
The short-circuit accelerated turn-off circuit provided by the embodiment greatly shortens the turn-off time of a field effect transistor, effectively avoids the problems of breakdown, burning and the like, realizes secondary use of a large-capacity lithium battery pack, and effectively saves energy.
Referring to fig. 1, in the prior art, the application principle of the AFE chip to the fet control is as follows: when the output positive end P + and the output negative end P-of the high-capacity lithium battery pack are short-circuited, the AFE chip starts a short-circuit protection function after detecting the short circuit, the potential of the control signal AFE _ G is gradually reduced, and the potential of the end Q1G is gradually reduced through a passage of the end AFE _ G- > R1- > Q1G, so that the voltage of the end Q1 GS is gradually reduced, and the end Q1 is gradually closed; however, the control signal AFE _ G needs about 200uS of time to reduce the potential of the Q1G terminal to be equal to the potential of the Q1S terminal, that is, about 200uS is needed in the Q1 closing process, in order to not affect the normal operation of the Q1 under normal conditions, the slow lowering effect of AFE _ G cannot be eliminated by adjusting the resistance value of R2, at this time, the short-circuit current of the large-capacity lithium battery pack is extremely large and can reach more than 3000A, the internal resistance increases and the heat rises greatly during the Q1 closing process, and the internal resistance greatly exceeds the Safe Area range of the Safe Operating Area of Q1, so that the Q1 is broken down and burnt.
In order to solve the problems in the prior art, the utility model provides a short-circuit accelerated shutdown circuit, which is applied to a large-capacity lithium battery pack, and comprises a shutdown control module and a shutdown acceleration module, as shown in fig. 2; the turn-off control module comprises a field effect transistor Q1, the D end of the field effect transistor Q1 is connected with the anode of the lithium battery pack, the G end of the field effect transistor Q1 is connected with a resistor R4, the resistor R4 is connected with a resistor R1 and a resistor R2, the resistor R1 is connected with an AFE chip, the resistor R2 is connected with the S end of the field effect transistor Q1, and the S end of the field effect transistor Q1 is connected with the positive output end; the turn-off acceleration module comprises a voltage stabilizing diode Z1, a first switch unit and a second switch unit; the D end of the field effect transistor Q1 is connected with a voltage stabilizing diode Z1, the voltage stabilizing diode Z1 is connected with a first switch unit, the first switch unit is connected with a second switch unit and an output positive end, the second switch unit is connected with a resistor R2 in parallel, and the second switch unit is connected with GND; the negative pole of lithium electricity battery package is connected with resistance R3 and connects GND, output negative terminal is connected to resistance R3.
Specifically, when the lithium battery pack has a short circuit between the output positive terminal P + and the output negative terminal P-, the AFE chip detects the short circuit and then starts the short circuit protection function, the potential of the control signal AFE _ G gradually decreases, and the potential of the Q1G terminal gradually decreases through the passage of the AFE _ G- > R1- > R4- > Q1G terminal, so that the voltage of the Q1 GS gradually decreases, and the Q1 is gradually turned off.
During the turn-off of the Q1, due to the gradual increase of the internal resistance of the Q1, the potential of the output positive end P +, namely the potential of the end of the Q1S, is lower than the potential of the end of the Q1D, and when the potential difference between the two is larger than the voltage drop of Z1, the first switching unit is conducted. The function of Z1 is to prevent the potential difference between the left end of Z1 and the first switch unit, which is generated when the short-circuit current is extremely large, from being large and thus the first switch unit is turned on in advance before the potential of the control signal AFE _ G does not start to fall due to the copper sheet impedance of the production line during the PCB layout and the DS internal resistance during the normal turn-on of Q1.
After the first switch unit is turned on, a path is formed among the first switch unit, the second switch unit and the terminal Q1S, so that the second switch unit is turned on.
When the output positive terminal P + potential, i.e. the potential of the terminal Q1S, changes from a positive potential to a negative potential, the GND-, the second switch unit and the terminal Q1S form a path, and the second switch unit is ensured to be continuously conducted.
When the second switch unit is turned on, a path is formed by the Q1G end-, the R4-, the second switch unit and the Q1S end, the lower end of the R4 and the Q1S end are in short circuit, so that the lower end of the R4 and the Q1S end are equal in potential, the original residual potential of the Q1G end is rapidly released through the R4, the falling speed of the residual potential can be adjusted by adjusting the resistance value of the R4, the Q1G end and the Q1S end are equal in potential, namely VGS of the Q1 is changed into 0V, the Q1 is turned off, the Q1 is guaranteed to be closed in a safety region of Safe Operating Area, and the Q1 is prevented from being broken down.
In some embodiments, the first switching unit includes a transistor Q2, a resistor R5, and a capacitor C1; the E end of the triode Q2 is connected with a voltage stabilizing diode Z1, the C end of the triode Q2 is connected with the second switch unit, the B end of the triode Q2 is connected with a resistor R5, the resistor R5 is connected with a capacitor C1, and the capacitor C1 is connected with the positive output end; the parameters of the resistor R5 and the capacitor C1 are set to ensure that the charging time of the capacitor C1 lasts until the potential of the positive output terminal is changed from positive potential to negative potential.
The first switch unit further comprises a resistor R9, the resistor R9 is arranged between the end B of the transistor Q2 and the end E of the transistor Q2, and the resistor R9 can prevent the end E or the end B of the transistor Q2 from being interfered to cause the malfunction of the diode Q2.
The second switch unit comprises a triode Q3, a resistor R6, a resistor R7 and a diode D1; the E end of the triode Q3 and the C end of the triode Q3 are respectively connected to two ends of a resistor R2, the B end of the triode Q3 is connected with a resistor R6 and a resistor R7, the resistor R6 is connected with a first switch unit, the resistor R7 is connected with a diode D1, the diode D1 is connected with GND, when the positive output end is positive potential, the diode D1 blocks the influence of the GND on the potential of the B end of the triode Q3 through the resistor R7, namely, the influence of the GND on the conduction of the triode Q3 is eliminated when the positive output end is positive potential.
The second switch unit further comprises a resistor R8, the resistor R8 is arranged between the end B of the transistor Q3 and the end E of the transistor Q3, and the resistor R8 can prevent the end E or the end B of the transistor Q3 from being interfered to cause the malfunction of the diode Q3.
Specifically, when the output positive terminal P + and the output negative terminal P-of the high-capacity lithium battery pack are short-circuited, the AFE chip detects the short circuit and starts the short circuit protection function, the potential of the control signal AFE _ G is gradually reduced, and the potential of the end Q1G is gradually reduced through the passage of the end AFE _ G- > R1- > R4- > Q1G, so that the voltage of the end Q1 GS is gradually reduced, and the end Q1 is gradually closed.
In the Q1 closing process, because the internal resistance of Q1 is gradually increased, the potential of the output positive end P +, namely the potential of the end Q1S is lower than the potential of the end Q1D, when the potential difference between the two ends is larger than the voltage drop of Z1, the end Q1D- > Z1- > Q2 EB- > R5- > C1- > P + forms a passage, C1 is continuously charged, and therefore current continuously flows through Q2 EB, and Q2 EC is conducted.
In this example, Z1 can prevent the total copper sheet impedance of the traces from the left end of Z1 to the PCB layout at the connection of the Q1D end and the Q1S end, i.e., the P + end at the right end of C1, and the DS internal resistance at the time of normal conduction of Q1 when the short-circuit current is extremely large, and the potential difference between the left end of Z1 and the right end of C1 is large, so that Q2 is turned on in advance before the potential of control signal AFE _ G does not start to fall.
When Q2 EC is turned on, the end of Q1D- > Z1- > Q2 EC- > R6- > Q3 BE- > Q1S forms a path, so that current continuously flows through Q3 BE, and Q3 CE is turned on. Wherein, the function of R8 is to prevent Q3 from malfunction caused by interference on the B terminal or E terminal of Q3, and the function of D1 is to block the influence of GND on the potential of Q3B terminal through R7 when P + is positive potential, namely to eliminate the influence of GND on the conduction of Q3 when P + is positive potential.
When the potential of the output positive terminal P +, namely the Q1S terminal is changed from the positive potential to the negative potential, GND- > D1- > R7- > Q3 BE- > Q1S terminal forms a path, so that the Q3 BE is ensured to continuously flow through current, the Q3 CE is ensured to BE continuously conducted, and the failure of the action of Q3 caused by the failure of the Q2 due to the influence of the charging time length of C1 is avoided, namely, after the output positive terminal P + is changed to the negative potential, the action of Q2 is failed after the C1 is fully charged for a period of time, and the path of GND- > D1- > R7- > Q3 BE- > Q1S terminal can continuously conduct the Q3 CE, so that the action of the Q3 is ensured not to fail. In this example, the resistor R5 and the capacitor C1 are set to ensure that the capacitor C1 is charged for a duration of time after the potential of the positive output terminal changes from a positive potential to a negative potential.
After Q3 CE is conducted, a Q1G end- > R4- > Q3 CE- > Q1S end forms a channel, the lower end of R4 and the Q3 end after the Q1S end is conducted are in short circuit, the lower end of R4 and the Q1S end are equal in potential, the original residual potential of the Q1G end is rapidly released through R4, the descending speed of the residual potential can be adjusted by adjusting the resistance value of R4, the Q1G end and the Q1S end are equal in potential, namely VGS of Q1 is changed into 0V, Q1 is turned off, Q1 is turned off completely through about 6uS, the Q1 is guaranteed to be turned off in a Safe region of Safe Operating Area, and Q1 breakdown and burning is avoided.
As shown in fig. 3, the utility model also provides a lithium battery package, turn-off circuit including above-mentioned short circuit with higher speed. The short-circuit acceleration turn-off circuit comprises a turn-off control module and a turn-off acceleration module; the turn-off control module comprises a field effect transistor Q1, the D end of the field effect transistor Q1 is connected with the anode of the lithium battery pack, the G end of the field effect transistor Q1 is connected with a resistor R4, the resistor R4 is connected with a resistor R1 and a resistor R2, the resistor R1 is connected with an AFE chip, the resistor R2 is connected with the S end of the field effect transistor Q1, and the S end of the field effect transistor Q1 is connected with the positive output end; the turn-off acceleration module comprises a voltage stabilizing diode Z1, a first switch unit and a second switch unit; the D end of the field effect transistor Q1 is connected with a voltage stabilizing diode Z1, the voltage stabilizing diode Z1 is connected with a first switch unit, the first switch unit is connected with a second switch unit and an output positive end, the second switch unit is connected with a resistor R2 in parallel, and the second switch unit is connected with GND; the negative pole of lithium electricity battery package is connected with resistance R3 and connects GND, output negative terminal is connected to resistance R3.
The lithium battery pack provided by the example has the advantages that the short circuit contained in the lithium battery pack is cut off in an accelerating mode, the closing time of the field effect transistor is effectively shortened greatly, the problems of breakdown, burning and the like are effectively avoided, the secondary use of the large-capacity lithium battery pack is realized, and the energy is effectively saved.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but the limitation of the patent scope of the present invention can not be understood thereby. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit and scope of the present invention, and therefore, the scope of the present invention should be determined by the appended claims.
Claims (7)
1. The short-circuit accelerated turn-off circuit is characterized by comprising a turn-off control module and a turn-off acceleration module;
the turn-off control module comprises a field effect transistor Q1, the D end of the field effect transistor Q1 is connected with the anode of the lithium battery pack, the G end of the field effect transistor Q1 is connected with a resistor R4, the resistor R4 is connected with a resistor R1 and a resistor R2, the resistor R1 is connected with an AFE chip, the resistor R2 is connected with the S end of the field effect transistor Q1, and the S end of the field effect transistor Q1 is connected with the positive output end;
the turn-off acceleration module comprises a voltage stabilizing diode Z1, a first switch unit and a second switch unit;
the D end of the field effect transistor Q1 is connected with a voltage stabilizing diode Z1, the voltage stabilizing diode Z1 is connected with a first switch unit, the first switch unit is connected with a second switch unit and an output positive end, the second switch unit is connected with a resistor R2 in parallel, and the second switch unit is connected with GND;
the negative pole of lithium electricity battery package is connected with resistance R3 and connects GND, output negative terminal is connected to resistance R3.
2. The short-circuit accelerated shutdown circuit of claim 1, wherein the first switching unit comprises a transistor Q2, a resistor R5, and a capacitor C1;
the E end of the triode Q2 is connected with a voltage stabilizing diode Z1, the C end of the triode Q2 is connected with the second switch unit, the B end of the triode Q2 is connected with a resistor R5, the resistor R5 is connected with a capacitor C1, and the capacitor C1 is connected with the positive output end.
3. The short-circuit accelerated shutdown circuit of claim 2, wherein the first switch unit further comprises a resistor R9, and the resistor R9 is disposed between the terminal B of the transistor Q2 and the terminal E of the transistor Q2.
4. The short-circuit accelerated shutdown circuit of claim 1, wherein the second switching unit comprises a transistor Q3 and a resistor R6;
the E end of the triode Q3 and the C end of the triode Q3 are respectively connected to two ends of the resistor R2, the B end of the triode Q3 is connected with the resistor R6, and the resistor R6 is connected with the first switch unit.
5. The short-circuit accelerated shutdown circuit of claim 4, wherein the second switch unit further comprises a resistor R8, and the resistor R8 is disposed between the terminal B of the transistor Q3 and the terminal E of the transistor Q3.
6. The short-circuit accelerated turn-off circuit of claim 4, wherein the second switch unit further comprises a resistor R7 and a diode D1, the B terminal of the transistor Q3 is connected with the resistor R7, the resistor R7 is connected with the diode D1, and the diode D1 is connected with GND.
7. A lithium battery pack comprising the short circuit accelerated shutdown circuit of any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020312797.XU CN211981480U (en) | 2020-03-13 | 2020-03-13 | Short circuit is turn-off circuit and lithium electricity battery package with higher speed |
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| CN202020312797.XU CN211981480U (en) | 2020-03-13 | 2020-03-13 | Short circuit is turn-off circuit and lithium electricity battery package with higher speed |
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| CN211981480U true CN211981480U (en) | 2020-11-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117134300A (en) * | 2023-09-06 | 2023-11-28 | 南京模砾半导体有限责任公司 | Circuit for preventing short-circuit current from damaging MOSFET |
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2020
- 2020-03-13 CN CN202020312797.XU patent/CN211981480U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117134300A (en) * | 2023-09-06 | 2023-11-28 | 南京模砾半导体有限责任公司 | Circuit for preventing short-circuit current from damaging MOSFET |
| CN117134300B (en) * | 2023-09-06 | 2024-03-15 | 南京模砾半导体有限责任公司 | Circuit for preventing short-circuit current from damaging MOSFET |
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