CN220896317U - Explosion-proof circuit for battery - Google Patents
Explosion-proof circuit for battery Download PDFInfo
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- CN220896317U CN220896317U CN202322110588.3U CN202322110588U CN220896317U CN 220896317 U CN220896317 U CN 220896317U CN 202322110588 U CN202322110588 U CN 202322110588U CN 220896317 U CN220896317 U CN 220896317U
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 47
- 239000003990 capacitor Substances 0.000 claims description 63
- 238000001514 detection method Methods 0.000 claims description 29
- 239000003381 stabilizer Substances 0.000 claims description 16
- 230000001276 controlling effect Effects 0.000 claims description 9
- 230000009977 dual effect Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000006641 stabilisation Effects 0.000 claims 1
- 238000011105 stabilization Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model discloses an explosion-proof circuit for a battery, which comprises: the battery protection device comprises a double protection circuit for overcurrent and overvoltage protection of a battery and a protection board for adjusting current flow, wherein a charging end of the protection board is connected with an external power supply, the protection board comprises a first protection circuit for overcurrent protection of current in the protection board and a voltage stabilizing circuit for stabilizing the voltage of the protection board input double protection circuit, the safety of the double protection circuit in the battery charging and discharging process is improved, and the reliability of the circuit is also ensured. And when the second protection circuit or the third protection circuit fails, the current output by the voltage stabilizing circuit can continue to charge and discharge the battery through the second protection circuit or the third protection circuit in a normal state, so that the reliability of the product is improved.
Description
Technical Field
The utility model relates to the technical field of battery protection, in particular to an explosion-proof circuit for a battery.
Background
The battery is an indispensable part of our daily life, but in the process of charging the battery, the battery can be overcharged to cause the conditions of overcurrent and overvoltage, and when the voltage in the battery exceeds the voltage carried by the battery, the danger of explosion of the battery is very easy to occur, so that the safety of people is influenced. The traditional battery explosion-proof circuit is a group of protection circuits connected with the battery, and comprises a protection IC and two switch modules, wherein the protection IC can adjust the on-off of the two switch modules, and when the battery is overcharged, the two switch modules can disconnect a charging loop of the battery through the on-off regulation of the protection IC, so that the phenomenon of overcharging of the battery is prevented. However, when the protection circuit fails, the battery cannot be continuously charged and protected, or the battery cannot be continuously charged, so that the safety of the battery is affected, and the reliability of the equipment is also affected.
Disclosure of utility model
The present utility model addresses the deficiencies in the prior art by providing an explosion-proof circuit for a battery comprising: the battery protection device comprises a double protection circuit for carrying out overcurrent and overvoltage protection on a battery and a protection plate for regulating the current flow direction, wherein the charging end of the protection plate is connected with an external power supply, the protection plate comprises a first protection circuit for carrying out overcurrent protection on the current in the protection plate and a voltage stabilizing circuit for stabilizing the voltage of the protection plate input double protection circuit, the input end of the first protection circuit is connected with the external power supply entering the protection plate, the output end of the first protection circuit is connected with the input end of the voltage stabilizing circuit, the double protection circuit comprises a second protection circuit and a third protection circuit, the output end of the voltage stabilizing circuit is respectively connected with the power end of the second protection circuit and the power end of the third protection circuit, the detection end of the second protection circuit is respectively connected with the detection end of the third protection circuit and the detection end of the battery, the output end of the second protection circuit is respectively connected with the anode and the cathode of the battery, and the first output end of the third protection circuit is connected with the input end of the second protection circuit and the second output end of the third protection circuit is connected with the cathode of the protection plate.
Preferably, the second protection circuit comprises a first switch module for controlling the connection of the battery and the protection board, and a first protection module for regulating the connection and disconnection of the first switch module, wherein the output end of the voltage stabilizing circuit and the anode of the battery are connected with the power end of the first protection module, the detection end of the first protection module is connected with the detection end of the battery, the first output end of the first protection module is connected with the first input end of the first switch module, the second output end of the first protection module is connected with the second input end of the first switch module, the first output end of the first switch module is connected with the cathode of the battery, and the second output end of the first switch module is connected with the input end of the first protection circuit.
Preferably, the third protection circuit comprises a second switch module for controlling the connection of the battery and the protection board, and a second protection module for regulating the connection and disconnection of the second switch module, wherein the output end of the voltage stabilizing circuit and the anode of the battery are connected with the power end of the second protection module, the detection end of the second protection module is connected with the detection end of the battery, the first output end of the second protection module is connected with the first input end of the second switch module, the second output end of the second protection module is connected with the second input end of the second switch module, and the first output end of the second switch module is connected with the input end of the first protection module and the second output end of the second protection module is connected with the cathode of the protection board.
Preferably, the first protection module includes a first IC chip, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1 and a resistor R2, where the model DW01, a pin 3 of the first IC chip is connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to a pin 6 of the first chip, one end of the capacitor C1 and one end of the capacitor C2, a pin 4 of the first chip is connected to the other end of the capacitor C1, the other end of the capacitor C2 and one end of the resistor R2, the other end of the resistor R1 is connected to the positive electrode of the battery cell and the output end of the voltage stabilizing circuit, and the other end of the resistor R3 is connected to the detection end of the battery.
Preferably, the first switch module includes a first N-type MOS tube and a second N-type MOS tube, the pin 1 of the first IC chip is connected to the gate G1 of the first N-type MOS tube and the gate G1 of the second N-type MOS tube respectively, the pin 2 of the first IC chip is connected to the gate G2 of the first N-type MOS tube and the gate G2 of the second N-type MOS tube respectively, the first source S1 of the first N-type MOS tube is connected to the fourth source S4 of the first N-type MOS tube, the first source S1 of the second N-type MOS tube, the fourth source S4 of the second N-type MOS tube, the cell negative electrode of the battery, and the other end of the capacitor C3 are connected to the pin 3 of the first IC chip and one end of the capacitor C3 respectively, the other end of the resistor R3 is connected to the second source S2 of the first N-type MOS tube, the third source S3 of the first N-type MOS tube, the fourth source S2 of the second N-type MOS tube, and the drain D1 of the second N-type MOS tube are connected to the first drain of the first N-type MOS tube and the second source S2 of the first N-type MOS tube respectively.
Preferably, the second protection module includes a second IC chip with a model DW01, a capacitor C11, a capacitor C21, a capacitor C31, a resistor R11, and a resistor R21, where the pin 3 of the second IC chip is connected to one end of the capacitor C31, the other end of the capacitor C31 is connected to the pin 6 of the second IC chip, one end of the capacitor C11, one end of the capacitor C21, a negative electrode of a battery cell, and a fourth source S4 of the second N-type MOS transistor, the other end of the capacitor C11 is connected to the pin 5 of the second IC chip and one end of the resistor R11, the other end of the resistor R11 is connected to the positive electrode of the battery cell and the output end of the voltage stabilizing circuit, and the other end of the capacitor C21 is connected to the pin 4 of the second IC chip and one end of the resistor R21, and the other end of the resistor R21 is connected to the detection end of the battery cell.
Preferably, the second switch module includes a third N-type MOS tube and a fourth N-type MOS tube, the leg 1 of the second IC chip is connected to the gate G1 of the third N-type MOS tube and the gate G1 of the fourth N-type MOS tube, the leg 2 of the second IC chip is connected to the gate G2 of the third N-type MOS tube and the gate G2 of the third N-type MOS tube, the first source S1 of the third N-type MOS tube is connected to the fourth source S4 of the third N-type MOS tube, the first source S1 of the fourth N-type MOS tube, the fourth source S4 of the fourth N-type MOS tube, and the other end of the resistor R3, the second protection module further includes a resistor R31, one end of the resistor R31 is connected to the leg 3 of the second IC chip and one end of the capacitor C31, and the other end of the resistor R31 is connected to the second source S2 of the third N-type MOS tube, the third source S3 of the third N-type MOS tube, the third source S2 of the fourth N-type MOS tube, the fourth source S2 of the fourth N-type MOS tube, the drain D2 of the fourth N-type MOS tube, and the drain D1 of the fourth N-type MOS tube.
Preferably, the first protection circuit includes a resistor R4 for limiting the output overcurrent of the protection board, and a fuse F1 for overcurrent protection, one end of the resistor R4 is connected with an external power supply in the protection board, the other end is connected with the input end of the fuse F1, and the output end of the fuse F1 is connected with the voltage stabilizing circuit.
Preferably, the voltage stabilizing circuit comprises at least one linear voltage stabilizer and voltage stabilizing diodes with the number corresponding to that of the linear voltage stabilizers, wherein the input end of the linear voltage stabilizer is connected with the output end of the fuse F1, the output end of the linear voltage stabilizer is connected with the input end of the voltage stabilizing diode, and the output end of the voltage stabilizing diode is respectively connected with the positive electrode of a battery core, the other end of the resistor R1 and the other end of the resistor R11.
Preferably, the first N-type MOS transistor, the second N-type MOS transistor, the third N-type MOS transistor, and the fourth N-type MOS transistor are all 8205A in type.
The double protection circuit in explosion protection comprises a second protection circuit and a third protection circuit which are used for carrying out overcurrent and overvoltage protection on the battery, when the second protection circuit or the third protection circuit fails, the second protection circuit or the third protection circuit which is still in a normal state can continuously provide overcurrent and overvoltage protection for the battery, and compared with a single protection circuit in the traditional battery protection circuit, the double protection circuit has double protection on the battery, increases the safety in the charging and discharging processes of the battery, and ensures the reliability of the circuit. And when the second protection circuit or the third protection circuit fails, the current output by the voltage stabilizing circuit can continue to charge and discharge the battery through the second protection circuit or the third protection circuit in a normal state, so that the reliability of the product is improved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:
Fig. 1 is a schematic block diagram of a battery explosion-proof circuit according to an embodiment of the present utility model.
Fig. 2 is a schematic circuit diagram of a dual protection circuit according to an embodiment of the utility model.
Fig. 3 is a schematic circuit diagram of a protection board according to an embodiment of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present utility model fall within the protection scope of the present utility model.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.
In this embodiment, as shown in fig. 1 or 2, in an explosion-proof circuit for a battery, it includes: the battery protection device comprises a double protection circuit for overcurrent and overvoltage protection of a battery and a protection plate for regulating the current flow direction, wherein the charging end of the protection plate is connected with an external power supply, the protection plate comprises a first protection circuit for overcurrent protection of the current in the protection plate and a voltage stabilizing circuit for stabilizing the voltage of the protection plate input double protection circuit, the input end of the first protection circuit is connected with the external power supply entering the protection plate, the output end of the first protection circuit is connected with the input end of the voltage stabilizing circuit, the double protection circuit comprises a second protection circuit and a third protection circuit, the output end of the voltage stabilizing circuit is respectively connected with the power end of the second protection circuit and the power end of the third protection circuit, the detection end of the second protection circuit is respectively connected with the detection end of the third protection circuit and the detection end of the battery, the output end of the second protection circuit is respectively connected with the anode and the cathode of the battery, and the first output end of the third protection circuit is connected with the input end of the second protection circuit and the second output end of the third protection circuit is connected with the cathode of the protection plate. When the lithium battery is charged, the double protection circuit can provide double overcurrent and overvoltage protection for the lithium battery, and when the second protection circuit or the third protection circuit has circuit faults, the other circuit of the double protection circuit can continuously provide overcurrent and overvoltage protection for the battery, so that the explosion-proof performance of the circuit can be improved, and the reliability and safety of the circuit are improved. And the dual protection circuit can realize the real-time acquisition of the data of the battery through the cooperation of the first protection circuit and the second protection circuit, and the on-off adjustment of a charge-discharge current loop of the battery is carried out through the voltage and current change of the battery, so that the safety of the battery during charging is ensured.
In this embodiment, the second protection circuit includes a first switch module for controlling the connection between the battery and the protection board, and a first protection module for controlling the connection and disconnection of the first switch module, the output end of the voltage stabilizing circuit and the positive electrode of the battery are both connected with the power end of the first protection module, the detection end of the first protection module is connected with the detection end of the battery, the first output end of the first protection module is connected with the first input end of the first switch module, the second output end is connected with the second input end of the first switch module, the first output end of the first switch module is connected with the negative electrode of the battery, and the second output end is connected with the input end of the first protection circuit. The first protection module can collect the voltage and the charge-discharge current of the battery cell in real time, and when the voltage and the charge-discharge current of the battery cell exceed the threshold values of the first protection module, the first protection module can carry out on-off adjustment on the first switch module, and the first switch module changes the current loop of the battery through on-off change, so that the battery protection module can be used for charging and discharging adjustment of the battery.
In this embodiment, the third protection circuit includes a second switch module for controlling the connection between the battery and the protection board, and a second protection module for controlling the connection and disconnection of the second switch module, the output end of the voltage stabilizing circuit and the positive electrode of the battery are both connected with the power end of the second protection module, the detection end of the second protection module is connected with the detection end of the battery, the first output end of the second protection module is connected with the first input end of the second switch module, the second output end is connected with the second input end of the second switch module, the first output end of the second switch module is connected with the input end of the first protection module, and the second output end is connected with the negative electrode of the protection board. The second protection module can collect the voltage and the charge-discharge current of the battery cell in real time, and when the voltage and the charge-discharge current of the battery cell exceed the threshold values of the second protection module, the second protection module can carry out on-off adjustment on the second switch module, and the second switch module changes the current loop of the battery through on-off change, so that the battery protection module can be used for charging and discharging adjustment of the battery.
In this embodiment, the first protection module includes a first IC chip with a model DW01, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1 and a resistor R2, where the first IC chip is U1 in fig. 2, a pin 3 of the first IC chip is connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to a pin 6 of the first chip, one end of the capacitor C1 and one end of the capacitor C2, a pin 4 of the first chip is connected to the other end of the capacitor C1, the other end of the capacitor C2 and one end of the resistor R2, the other end of the resistor R1 is connected to the positive electrode of the battery cell and the output end of the voltage stabilizing circuit, and the other end of the resistor R3 is connected to the detection end of the battery cell. The first switch module comprises a first N-type MOS tube and a second N-type MOS tube, the first N-type MOS tube is U2 in FIG. 2, the second N-type MOS tube is U3 in FIG. 2, a pin 1 of the first IC chip is respectively connected with a grid G1 of the first N-type MOS tube and a grid G1 of the second N-type MOS tube, a pin 2 of the first IC chip is respectively connected with the grid G2 of the first N-type MOS tube and the grid G2 of the second N-type MOS tube, a first source S1 of the first N-type MOS tube is respectively connected with a fourth source S4 of the first N-type MOS tube, a fourth source S4 of the second N-type MOS tube, a cell cathode of a battery and the other end of a capacitor C3, the other end of the resistor R3 is respectively connected with one end of the pin 3 of the first IC chip and one end of the capacitor C3, and the other end of the resistor R3 is respectively connected with a drain electrode S1 of the first N-type MOS tube, a drain electrode S2 of the second N-type MOS tube and a drain electrode S2 of the second N-type MOS tube are respectively connected with a drain electrode S1 of the first N-type MOS tube and a drain electrode S2 of the second N-type MOS tube.
In this embodiment, the current output by the voltage stabilizing circuit can charge the battery through the first N-type MOS transistor and the second N-type MOS transistor, at this time, the pin 5 and the pin 6 of the first IC chip are both power supply terminals and battery cell voltage detection terminals, the first IC chip can detect the voltage of the battery cell through R1, along with the progress of the charging process, the voltage of the battery cell is continuously increased, when the voltage of the battery cell is increased to the overcharge protection voltage of the battery cell, that is, when the voltage of the battery cell reaches the threshold value of the overcharge protection voltage of the first IC chip, the pin 2 of the first IC chip outputs a high level to cut off the corresponding N-type MOS transistor, thereby realizing the turn-off of the battery charging circuit and the overcharge protection of the battery. When the voltage of the battery cell is reduced to the overcharge protection voltage threshold of the first IC chip, the pin 2 of the first IC chip can be restored to a low-level state to conduct the corresponding N-type MOS tube, so that the battery can be recharged, and the battery can be overcharged and protected.
In this embodiment, when the battery is discharged, the pins 5 and 6 of the first IC chip also detect the voltage of the battery cell, when the voltage of the battery cell drops by the protection voltage threshold of the first IC chip, the pin 1 of the first IC chip randomly outputs a high level to turn off the corresponding N-type MOS transistor, and the discharging operation on the battery is stopped by turning off the discharging loop, at this time, the voltage of the battery cell will rise, and when the voltage of the battery cell rises to the over-discharge protection voltage, the pin 1 of the first IC chip resumes a low level to turn on the corresponding N-type MOS transistor, thereby realizing the discharging protection on the battery cell.
In this embodiment, when the battery is in a discharging process, the loop current is too large, the first N-type MOS transistor and the second N-type MOS transistor are saturated and conducted to have internal resistance, when the current flows through the current loop between the protection board and the battery core, voltage drops are generated at two ends of the first N-type MOS transistor and the second N-type MOS transistor, the pin 3 and the pin 6 of the first IC chip detect the voltage at two ends of the first N-type MOS transistor and the second N-type MOS transistor in real time through R3, and when the voltage rises to the detection threshold of the first IC chip, the pin 1 of the first IC chip outputs a high level to turn off the corresponding N-type MOS transistor, so that the discharging loop is disconnected, and the occurrence of overcurrent or short circuit of the discharging loop can be prevented.
In this embodiment, the second protection module includes a second IC chip with a model DW01, a capacitor C11, a capacitor C21, a capacitor C31, a resistor R11, and a resistor R21, where the second IC chip is U11 in fig. 2, a pin 3 of the second IC chip is connected to one end of the capacitor C31, the other end of the capacitor C31 is connected to a pin 6 of the second IC chip, one end of the capacitor C11, one end of the capacitor C21, a negative electrode of a battery cell, and a fourth source S4 of a second N-type MOS transistor, the other end of the capacitor C11 is connected to a pin 5 of the second IC chip and one end of the resistor R11, the other end of the resistor R11 is connected to an anode of the battery cell and an output end of the voltage stabilizing circuit, the other end of the capacitor C21 is connected to a pin 4 of the second IC chip and one end of the resistor R21, and the other end of the resistor R21 is connected to a detection end of the battery cell. The second switch module comprises a third N-type MOS tube and a fourth N-type MOS tube, the third N-type MOS tube is U21 in fig. 2, the fourth N-type MOS tube is U31 in fig. 2, the pin 1 of the second IC chip is connected with the gate G1 of the third N-type MOS tube and the gate G1 of the fourth N-type MOS tube respectively, the pin 2 of the second IC chip is connected with the gate G2 of the third N-type MOS tube and the gate G2 of the third N-type MOS tube respectively, the first source S1 of the third N-type MOS tube is connected with the fourth source S4 of the third N-type MOS tube, the fourth source S4 of the fourth N-type MOS tube and the other end of the resistor R3, the second protection module further comprises a resistor R31, one end of the resistor R31 is connected with the pin 3 of the second IC chip and one end of the capacitor C31 respectively, and the other end of the resistor R31 is connected with the second source S2 of the third N-type MOS tube, the fourth source S4 of the fourth N-type MOS tube and the drain 2 of the fourth N-type MOS tube are connected with the drain 2 of the third N-type MOS tube, the fourth N-type MOS tube and the fourth N-type MOS tube, the drain 2 of the fourth N-type MOS tube is connected with the fourth source S2 of the fourth N-type MOS tube, and the fourth N-type MOS tube is connected with the drain 2 of the fourth N-type MOS tube, and the fourth MOS tube is. The protection principle of the second protection module and the second switching module for charging, discharging, overcurrent and short-circuit of the battery is the same as that of the first protection module and the first switching module, and will not be repeated here.
In this embodiment, the first N-type MOS transistor, the second N-type MOS transistor, the third N-type MOS transistor, and the fourth N-type MOS transistor are all 8205A in type, and the dual protection circuit may provide dual protection functions for the charging loop of the battery, and charge the battery through the first N-type MOS transistor, the second N-type MOS transistor, the third N-type MOS transistor, and the fourth N-type MOS transistor, where the dual protection circuit may realize dual protection for the battery, and improve the explosion-proof performance of the product.
In this embodiment, the first protection circuit includes a resistor R4 for limiting the output overcurrent of the protection board, and a fuse F1 for overcurrent protection, where one end of the resistor R4 is connected to an external power supply in the protection board, the other end is connected to an input end of the fuse F1, and an output end of the fuse F1 is connected to the voltage stabilizing circuit. The fuse F1 is a fast-fusing fuse, and when the current in the protection plate flows, the current can be cut off in a fast-fusing mode, so that other components can be prevented from being damaged. The resistor R4 is a current limiting power resistor, and can limit the current in the circuit to prevent other components from being damaged.
In this embodiment, the voltage stabilizing circuit includes at least one linear voltage stabilizer and a number of voltage stabilizing diodes corresponding to the linear voltage stabilizer, where an input end of the linear voltage stabilizer is connected to an output end of the fuse F1, an output end of the linear voltage stabilizer is connected to an input end of the voltage stabilizing diode, and an output end of the voltage stabilizing diode is connected to a positive electrode of a battery cell, another end of the resistor R1, and another end of the resistor R11, respectively. The linear voltage stabilizer and the voltage stabilizing diode can be used for stabilizing the output voltage, the voltage stabilizing diode can be arranged to continuously finish the voltage stabilizing work when the linear voltage stabilizer is damaged or breaks down, the voltage of the voltage small residual input end of the output end of the linear voltage stabilizer is ensured or is similar to the voltage output by the normal limit voltage stabilizer, and the reliability of products is ensured.
In another embodiment, as shown in fig. 3, where fig. 3 is a circuit of a protection board, a resistor R4 is connected to the protection board, and a fuse F1 is connected to the protection board.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
In summary, the foregoing description is only of the preferred embodiments of the present utility model, and all equivalent changes and modifications made in accordance with the claims should be construed to fall within the scope of the utility model.
Claims (10)
1. An explosion-proof circuit for a battery, comprising: the battery protection device comprises a double protection circuit for overcurrent and overvoltage protection of a battery and a protection board for regulating the current flow direction, wherein a charging end of the protection board is connected with an external power supply, and the protection board comprises a first protection circuit for overcurrent protection of the current in the protection board and a voltage stabilizing circuit for voltage stabilization treatment of the voltage input into the double protection circuit by the protection board;
The input end of the first protection circuit is connected with an external power supply entering the protection board, the output end of the first protection circuit is connected with the input end of the voltage stabilizing circuit, the dual protection circuit comprises a second protection circuit and a third protection circuit, the output end of the voltage stabilizing circuit is respectively connected with the power end of the second protection circuit and the power end of the third protection circuit, the detection end of the second protection circuit is respectively connected with the detection end of the third protection circuit and the detection end of the battery, the output end of the second protection circuit is respectively connected with the anode and the cathode of the battery, and the first output end of the third protection circuit is connected with the input end of the second protection circuit and the second output end of the third protection circuit is connected with the cathode of the protection board.
2. The explosion-proof circuit for a battery according to claim 1, wherein: the second protection circuit comprises a first switch module used for controlling the battery to be conducted with the protection board and a first protection module used for regulating the on-off of the first switch module, the output end of the voltage stabilizing circuit and the anode of the battery are connected with the power end of the first protection module, the detection end of the first protection module is connected with the detection end of the battery, the first output end of the first protection module is connected with the first input end of the first switch module, the second output end of the first protection module is connected with the second input end of the first switch module, the first output end of the first switch module is connected with the cathode of the battery, and the second output end of the first switch module is connected with the input end of the first protection circuit.
3. The explosion-proof circuit for a battery according to claim 2, wherein: the third protection circuit comprises a second switch module used for controlling the battery to be conducted with the protection board and a second protection module used for regulating and controlling the on-off of the second switch module, the output end of the voltage stabilizing circuit and the anode of the battery are connected with the power end of the second protection module, the detection end of the second protection module is connected with the detection end of the battery, the first output end of the second protection module is connected with the first input end of the second switch module, the second output end of the second protection module is connected with the second input end of the second switch module, and the first output end of the second switch module is connected with the input end of the first protection module and the second output end of the second protection module is connected with the cathode of the protection board.
4. An explosion-proof circuit for a battery according to claim 3, wherein: the first protection module comprises a first IC chip with the model of DW01, a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1 and a resistor R2, wherein a pin 3 of the first IC chip is connected with one end of the capacitor C3, the other end of the capacitor C3 is respectively connected with a pin 6 of the first chip, one end of the capacitor C1 and one end of the capacitor C2, a pin 4 of the first chip is respectively connected with the other end of the capacitor C1, the other end of the capacitor C2 and one end of the resistor R2, the other end of the resistor R1 is respectively connected with the positive electrode of a battery core and the output end of a voltage stabilizing circuit, and the other end of the resistor R3 is connected with the detection end of the battery.
5. The explosion-proof circuit for a battery according to claim 4, wherein: the first switch module comprises a first N-type MOS tube and a second N-type MOS tube, a pin 1 of the first IC chip is respectively connected with a grid G1 of the first N-type MOS tube and a grid G1 of the second N-type MOS tube, a pin 2 of the first IC chip is respectively connected with a grid G2 of the first N-type MOS tube and a grid G2 of the second N-type MOS tube, a first source S1 of the first N-type MOS tube is respectively connected with a fourth source S4 of the first N-type MOS tube, a first source S1 of the second N-type MOS tube, a fourth source S4 of the second N-type MOS tube, a battery cell cathode and the other end of a capacitor C3, the first protection module further comprises a resistor R3, one end of the resistor R3 is respectively connected with the pin 3 of the first IC chip and one end of the capacitor C3, and the other end of the resistor R3 is respectively connected with a second source S2 of the first N-type MOS tube, a third source S3 of the first N-type MOS tube, a second source S2 of the second N-type MOS tube and a drain electrode S2 of the second N-type MOS tube, and a drain electrode D of the first N-type MOS tube are respectively connected with the first source S2 of the second N-type MOS tube and the drain electrode of the first N-type MOS tube.
6. The explosion-proof circuit for a battery according to claim 5, wherein: the second protection module comprises a second IC chip with the model of DW01, a capacitor C11, a capacitor C21, a capacitor C31, a resistor R11 and a resistor R21, wherein a pin 3 of the second IC chip is connected with one end of the capacitor C31, the other end of the capacitor C31 is respectively connected with a pin 6 of the second IC chip, one end of the capacitor C11, one end of the capacitor C21, a battery cell cathode of a battery and a fourth source S4 of a second N-type MOS tube, the other end of the capacitor C11 is respectively connected with a pin 5 of the second IC chip and one end of the resistor R11, the other end of the resistor R11 is respectively connected with a battery cell anode and an output end of a voltage stabilizing circuit, the other end of the capacitor C21 is respectively connected with one end of the pin 4 of the second IC chip and one end of the resistor R21, and the other end of the resistor R21 is connected with a detection end of the battery.
7. The explosion-proof circuit for a battery according to claim 6, wherein: the second switch module comprises a third N-type MOS tube and a fourth N-type MOS tube, a pin 1 of the second IC chip is respectively connected with a grid G1 of the third N-type MOS tube and a grid G1 of the fourth N-type MOS tube, a pin 2 of the second IC chip is respectively connected with a grid G2 of the third N-type MOS tube and a grid G2 of the third N-type MOS tube, a first source S1 of the third N-type MOS tube is respectively connected with a fourth source S4 of the third N-type MOS tube, a first source S1 of the fourth N-type MOS tube, a fourth source S4 of the fourth N-type MOS tube and the other end of a resistor R3, one end of the resistor R31 is respectively connected with one end of a pin 3 of the second IC chip and one end of a capacitor C31, and the other end of the resistor R31 is respectively connected with a second source S2 of the third N-type MOS tube, a third source S3 of the third N-type MOS tube, a fourth source S2 of the fourth N-type MOS tube and a drain electrode D1 of the fourth N-type MOS tube, and a drain D1 of the fourth N-type MOS tube.
8. The explosion-proof circuit for a battery according to claim 7, wherein: the first protection circuit comprises a resistor R4 for limiting the output overcurrent of the protection plate and a fuse F1 for overcurrent protection, one end of the resistor R4 is connected with an external power supply in the protection plate, the other end of the resistor R4 is connected with the input end of the fuse F1, and the output end of the fuse F1 is connected with the voltage stabilizing circuit.
9. The explosion-proof circuit for a battery according to claim 8, wherein: the voltage stabilizing circuit comprises at least one linear voltage stabilizer and voltage stabilizing diodes with the quantity corresponding to that of the linear voltage stabilizer, wherein the input end of the linear voltage stabilizer is connected with the output end of the fuse F1, the output end of the linear voltage stabilizer is connected with the input end of the voltage stabilizing diode, and the output end of the voltage stabilizing diode is respectively connected with the positive electrode of a battery cell, the other end of the resistor R1 and the other end of the resistor R11.
10. The explosion-proof circuit for a battery according to claim 9, wherein: the first N-type MOS tube, the second N-type MOS tube, the third N-type MOS tube and the fourth N-type MOS tube are 8205A in model.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322110588.3U CN220896317U (en) | 2023-08-07 | 2023-08-07 | Explosion-proof circuit for battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322110588.3U CN220896317U (en) | 2023-08-07 | 2023-08-07 | Explosion-proof circuit for battery |
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| CN220896317U true CN220896317U (en) | 2024-05-03 |
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| CN202322110588.3U Active CN220896317U (en) | 2023-08-07 | 2023-08-07 | Explosion-proof circuit for battery |
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