CN211263692U - Short circuit test circuit and tester of negative pole protection type lithium cell protection shield - Google Patents
Short circuit test circuit and tester of negative pole protection type lithium cell protection shield Download PDFInfo
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Abstract
The utility model is suitable for a lithium cell product test technical field provides a short circuit test circuit, tester and method of negative pole protection type lithium battery protection shield. The short circuit test circuit includes: the short circuit starting switch tube assembly, the capacitor assembly, the air switch group, the indicating unit capable of being manually switched, the controller and the level conversion circuit. Because the capacitor assembly comprises a plurality of high-capacity capacitors which can be independently controlled to be connected, and the pulse width of the pulse driving signal output by the controller can also be set, different short circuit test thresholds are realized by controlling the specific capacity of the connected high-capacity capacitors or the pulse width of the pulse driving signal, and whether the short circuit protection function of the battery protection board is effective or not is judged by combining the state indication of the prompt unit.
Description
Technical Field
The utility model belongs to the technical field of lithium cell product test, especially, relate to a short circuit test circuit and tester of negative pole protection type lithium battery protection shield.
Background
Lithium battery products with protection circuit all have overcharge, overdischarge, overflow, overtemperature and short circuit protection function, when testing its basic function, these several items of overcharge, overdischarge, overflow and overtemperature can use electronic load appearance, DC power supply and thermostated container to test, and the short circuit test generally has these several kinds of modes: firstly, the output is directly short-circuited, secondly, the short-circuit function of a load instrument is used, and thirdly, an air switch is used. The first and the second methods are basically the same, and the product development needs to test whether the short circuit parameters of the battery protection board are adjusted for a plurality of times, if the short circuit parameters are not adjusted correctly, the short circuit function of the protection board is invalid or the protection threshold of the protection board is not reached during the test, so that the protection board and the battery are burnt if the three methods are used for testing, and the safety of personnel is endangered if the three methods are used for testing.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a brand-new negative pole type lithium cell protection shield's short mode is aimed at providing, no matter whether the short circuit parameter of protection shield has transferred, all can accomplish the short circuit test safely, successfully.
In order to solve the above technical problem, in a first aspect, the present invention provides a short circuit test circuit for a negative electrode protection type lithium battery protection board, the negative electrode protection type lithium battery protection board has a protection circuit, a battery board anode B + for connecting with a lithium battery anode, a battery board cathode B-, a discharge anode P +, a discharge cathode P-, a discharge switch tube is arranged between the battery board cathode B-and the discharge cathode P-, and the on-off state of the discharge switch tube is controlled by the protection circuit;
the short circuit test circuit includes:
the short circuit starting switch tube assembly is provided with a first end, a second end and a switch control end, and the first end of the short circuit starting switch tube assembly is connected with the discharge cathode P < - >;
the capacitor assembly is formed by connecting a plurality of large-capacity capacitors in parallel, and the first end of each large-capacity capacitor is connected to the second end of the short circuit starting switch tube assembly;
the air switch assembly is formed by connecting a plurality of air switches in parallel, the first ends of the air switches are correspondingly connected with the second ends of the high-capacity capacitors one by one, the second ends of the air switches are connected to the discharging anode P +, and each air switch is used for controlling the on-off between the corresponding high-capacity capacitor and the discharging anode P +;
an indicating unit which can be manually switched and is positioned on a power supply loop formed by the battery panel cathode B-and the discharging cathode P-, when the indicating unit is manually switched on, the battery panel cathode B-and the discharging cathode P-are switched on to have a state indication, the state indication disappears when the short-circuit protection is carried out on the protection circuit, and the state indication is kept when the short-circuit protection is not carried out on the protection circuit;
the controller is connected with the cathode B-of the battery panel and used for outputting a pulse driving signal with preset pulse width when the indicating unit is detected to indicate the state;
and the input end of the level conversion circuit receives the pulse driving signal, and the output end of the level conversion circuit is connected with the switch control end of the short-circuit starting switch tube assembly and is used for controlling the short-circuit starting switch tube assembly to be opened after the pulse driving signal is subjected to level conversion.
In a second aspect, the present invention further provides a tester for testing the negative electrode protection type lithium battery protection board, the tester includes at least the first aspect the short circuit test circuit.
The utility model discloses the short circuit test circuit that each aspect relates can be used to test negative pole protection type lithium battery protection shield's short circuit function, but contain a plurality of independent control switch-on's large capacity electric capacity among the capacitor assembly in this short circuit test circuit, and the pulse width of the pulse drive signal that the controller exported also can set up, the specific capacity of large capacity electric capacity through the control switch-on or the pulse width of pulse drive signal realize different short circuit test thresholds, it is effective whether the state instruction that reunites the suggestion unit judges battery protection shield short circuit protection function, because short circuit test threshold can be from low to high regulation, thereby the risk that leads to battery protection shield and group battery to burn out when having avoided direct high threshold test short circuit, no matter whether the short circuit function of battery protection shield is effective, all can test with this circuit. The whole circuit components of the short-circuit test circuit are universal and easy to obtain, the circuit structure is simple, stable and reliable, and the short-circuit test circuit can be used for verification test and batch test of lithium battery product experiments and product test of a client side.
Drawings
Fig. 1 is a structural diagram of a lithium battery product according to a first embodiment of the present invention;
fig. 2 is a specific structural diagram of a short circuit test circuit of a negative electrode protection type lithium battery protection plate according to a first embodiment of the present invention;
fig. 3 is a flowchart of a short circuit test according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment of the present invention provides a short circuit test circuit for a negative electrode protection type lithium battery protection plate, which belongs to a part of a lithium battery product, referring to fig. 1, the lithium battery product comprises a lithium battery pack 11 and a negative electrode protection type lithium battery protection plate 12 connected with each other, the negative electrode protection type lithium battery protection plate 12 has a protection circuit 121, a battery plate positive electrode B + for connecting with a positive electrode of the lithium battery pack 11, a battery plate negative electrode B-, a discharge positive electrode P +, a discharge negative electrode P-, a discharge switching tube 122 and a charge switching tube 123 are provided between the battery plate negative electrode B-and the discharge negative electrode P-, the on-off states of the discharge switching tube 122 and the charge switching tube 123 are controlled by the protection circuit 121, and when charging, the discharge switching tube 122 itself is turned on, during discharging, the charging switch 123 is turned on.
The specific structure of the short circuit test circuit of the negative electrode protection type lithium battery protection board is specifically shown in fig. 2, and comprises: a short circuit starting switch tube component 21, a capacitor component 22, an air switch group 23, a manual switching indicating unit and controller 24 and a level conversion circuit 25. The concrete connection relation and the working principle of each part are as follows:
the short start switch tube assembly 21 has a first end (referring to the pin labeled "3" of each MOS transistor in fig. 2), a second end (referring to the pin labeled "2" of each MOS transistor in fig. 2), and a switch control end (referring to the pin labeled "1" of each MOS transistor in fig. 2), and the first end is connected to the discharge cathode P-. Specifically, considering that the current generated in the short circuit moment can reach the maximum current of hundreds of thousands of amperes, a single MOS transistor cannot meet the requirement, it is ensured that the short circuit protection circuit can be applied to most of negative protection type lithium battery protection boards, and the whole tester cannot be burned out, so that the mode that a plurality of MOS transistors are adopted in the middle short circuit starting switch tube assembly 21 is implemented, as shown in fig. 2, the short circuit starting switch tube assembly 21 includes: and the source electrode of each MOS tube is used as the first end, the drain electrode of each MOS tube is used as the second end, and the grid electrode of each MOS tube is used as the switch control end.
The capacitor assembly 22 is formed by connecting a plurality of large-capacity capacitors in parallel, and a first end of each large-capacity capacitor is connected to a second end of the short-circuit starting switch tube assembly 21, and generally, the capacity is thousands of uF. As an example, as identified in fig. 2, the capacity of each large-capacity capacitor has a plurality of specifications, for example, 3300uF, 4700uF, 10000uF, and the like.
The air switch assembly 23 is formed by connecting a plurality of air switches in parallel, the first ends of the air switches are connected with the second ends of the high-capacity capacitors in a one-to-one correspondence manner, the second ends of the air switches are connected to the discharging anode P +, and each air switch is used for controlling the on-off between the corresponding high-capacity capacitor and the discharging anode P +. During operation, a certain large-capacity capacitor in the capacitor assembly 22 can be controlled to be switched on through a single air switch, or a plurality of large-capacity capacitors in the capacitor assembly 22 can be controlled to be switched on through a plurality of air switches simultaneously, so that different short circuit test thresholds are realized.
In the manual-switchable indicating unit and controller 24, the manual-switchable indicating unit is located on a power supply circuit formed by the battery panel cathode B-and the discharging cathode P-, and when manually turned on, the battery panel cathode B-and the discharging cathode P-are turned on to indicate a status, and the status indication disappears when the protection circuit 121 is short-circuited, and the status indication is maintained when the protection circuit 121 is not short-circuited. And the power supply cathode of the controller is connected with the cathode B-of the battery panel and is used for outputting a pulse driving signal with preset pulse width when the indicating unit is detected to have state indication.
Wherein, but manual switch's indicating unit includes: the LED lamp comprises a key S1 and a first LED1, wherein one end of the key S1 is connected with a 5V power circuit, the anode of the first LED1 is connected with the other end of the key S1 through a resistor R16, and the cathode of the first LED1 is connected with the negative discharge electrode P-after passing through a first diode D1 and a second diode D2. The purpose of using the cascade connection of the first diode D1 and the second diode D2 in the manually switchable indicating unit is to ensure that the voltage of the lithium battery pack 11 can be isolated in the reverse direction, when a short circuit is tested, in a period of sending a pulse driving signal, if the short circuit protection occurs in the lithium battery protection board 12 with the protection of the negative electrode protection type in advance, and the pulse is not finished, the negative electrode P-and the positive electrode P + of the discharge are connected together, and the voltage of the positive electrode P + of the discharge cannot flow back to the relevant pin of the controller, but the short circuit testing circuit needs to be suitable for most of the lithium battery protection boards with the protection of the negative electrode protection type, the total voltage of the lithium battery pack 11 with high string number commonly used can exceed 100V, so the reverse isolation in the position must be greater than 100V, a single diode above 100V is rarely used, and therefore two diodes of 100V are used here.
The controller is provided with a power supply positive port, a power supply negative port, a state indication detection port, a pulse driving signal output port and a setting port. The controller can be implemented by a single chip microcomputer, generally, MCUs with more than 8 bits are available, as an example, the controller in fig. 2 shows specific connections by taking a modern MC97F1204S as an example, a power supply positive electrode port is a1 st port VDD, a power supply negative electrode port is a 16 th port VSS, a state indication detection port is a 5 th port, a pulse driving signal output port is a 6 th port, and ports are set to be 14 th and 15 th ports. Specifically, the 1 st port VDD is connected to the 5V power supply circuit, the 2 nd, 3 rd, and 4 th ports are interfaces of MCU emulation and burning programs, and are connected to external emulation and burning equipment through the lower connector J7, the 5 th port is a state indication detection port, and is connected to the other end of the key S1, the 6 th port is an output port of the pulse driving signal, and is connected to the input end of the level shift circuit 25, the 7 th to 13 th ports are idle, the 14 th port is connected to the single-pole double-throw switch S3 through the resistor R17, the 15 th port is connected to the single-pole double-throw switch S2 through the resistor R12, the 16 th port VSS is connected to GND, wherein the single-pole double-throw switches S2 and S3 are used as setting ports for setting pulse widths of the pulse driving signal, and the single-pole double-throw switches S2 and S3 have two states, respectively, so that four kinds of pulse widths can be set. The 1 st port VDD as the power supply positive port and the 16 th port VSS as the power supply negative port are connected to each other through a capacitor C6.
In fig. 2, J4 is a power supply access port for externally connecting a 12V power adapter to supply power to the whole short circuit test circuit, a port 2 of the power adapter outputs a 12V voltage signal, and a port 1 of the power adapter is connected to GND.
The 5V power supply circuit described above includes: the three-terminal programmable voltage-stabilizing reference chip comprises a three-terminal programmable voltage-stabilizing reference chip U1, a triode Q5, a resistor R1, a resistor R6, a resistor R7 and a capacitor C3. The anode terminal (marked as 2 in figure 2) of the three-terminal programmable regulated voltage reference chip U1 is connected with GND, the cathode terminal (marked as 3 in figure 2) is connected with the base of a triode Q5, and the reference terminal (marked as 1 in figure 2) is connected with the base of a triode Q5 through a capacitor C3. An emitter of the triode Q5 is used as a 5V voltage output end and is connected with one end of the key S1 and a power supply positive electrode port of the controller, the emitter is sequentially connected to GND through a resistor R1 and a resistor R6, a serial connection position of the resistor R1 and a resistor R6 is connected with a reference end of the three-terminal programmable voltage-stabilizing reference chip U1, a collector of the triode Q5 is connected with an external 12V power supply, and a resistor R7 is further connected between a grid electrode and a collector electrode of the triode Q5.
The input end of the level shift circuit 25 receives the pulse driving signal, and the output end thereof is connected to the switch control end of the short-circuit starting switch tube assembly 21, and is used for performing level shift on the pulse driving signal and then controlling the short-circuit starting switch tube assembly 21 to be turned on. As shown in fig. 2, the level conversion circuit 25 includes: an NPN transistor Q11, an NPN transistor Q12, and a PNP transistor Q13. The base electrode of the triode Q11 is connected with the pulse driving signal output port of the controller through a resistor R27, the collector electrode is connected with an external 12V power supply through a resistor R23, and the emitter electrode is connected with GND. The base electrode of the triode Q12 is connected with the collector electrode of the triode Q11, the collector electrode is connected with an external 12V power supply, the emitter electrode is connected with the emitter electrode of the triode Q13, the base electrode of the triode Q13 is connected with the collector electrode of the triode Q11, and the collector electrode is connected with GND. The node between the emitter of transistor Q12 and the emitter of transistor Q13 is connected as an output terminal to the switch control terminal of short start switch tube assembly 21. In fig. 2, the base of each transistor of the level shifter circuit 25 is labeled "1", the collector is labeled "2", and the emitter is labeled "3".
In addition, as shown in fig. 2, GND is connected to the cathode B of the panel through a resistor R20, a resistor R28 and a resistor R29 are connected in parallel between the discharge anode P + and the discharge cathode P-, the resistor R28 and the resistor R29 are similar to a small load and used for stabilizing a circuit, and an external 12V power supply is connected to GND through a resistor R24 and a second light emitting diode LED2 in sequence.
By pressing a key S1 in the indicating unit capable of being manually switched, the anode of the first light emitting diode LED1 is switched into a 5V power supply, the first light emitting diode LED1 lights up, meanwhile, the 5 th port of the MCU also detects a high level, the 6 th port of the MCU is temporarily switched from a default high level to a low level through MCU software, after the conversion of the level conversion circuit 25, the driving voltage of the short-circuit starting switch tube component 21 is switched from 0V to 12V, each MOS tube is temporarily switched on, the switching-on time is regulated by the single-pole double-throw switch S2/S3, the switching-on time is generally between 100uS and 1mS, and the P + and the P-charge a large-capacity capacitor switched into by the air switch component 23. If the negative electrode protection type lithium battery protection plate 12 detects short circuit protection, the discharge switch tube 122 is closed, the negative electrode P-of the first light emitting diode LED1 is disconnected from the negative electrode B-of the MCU, the power supply of the first light emitting diode LED1 cannot form a loop, the first light emitting diode LED1 is turned off, and the overall result is that the first light emitting diode LED1 blinks and then turns off after the key S1 is pressed, which indicates that the negative electrode protection type lithium battery protection plate 12 has short circuit protection. If the negative electrode protection type lithium battery protection plate 12 does not detect short circuit protection, the P-and B-are always connected together, and the first light emitting diode LED1 is normally on after the key S1 is pressed, which means that the negative electrode protection type lithium battery protection plate 12 does not generate short circuit protection.
The occurrence of short-circuit protection of the negative electrode protection type lithium battery protection plate 12 requires two conditions: the instantaneous current should reach the value set by the protection circuit 121, and the current duration should reach the set value. Aiming at the lithium battery pack 11 which is not protected, air switches corresponding to a high-capacity capacitor in the capacitor assembly 22 can be gradually closed to adjust current gears, the total capacitor connected into a loop is increased, and the instant discharge current of the lithium battery pack 11 is increased so as to reach a short-circuit protection threshold; the MCU can be adjusted through the single-pole double-throw switch S2/S3 to increase the on-time adjustment time step of the MOS tube of the short-circuit starting switch tube component 21. The air switch of the air switch group 23 and the single-pole double-throw switch S2/S3 are used for adjusting the short-circuit current and the short-circuit time together, and the current or time gear of the lithium battery pack 11 is tested to be protected, so that whether the short-circuit protection exists in the negative electrode protection type lithium battery protection board 12 or not and whether the gear of the short-circuit protection is reasonable or not are judged, and the short-circuit parameters of the short-circuit protection circuit of the negative electrode protection type lithium battery protection board 12 are adjusted and optimized.
The utility model discloses the second embodiment provides a tester for test negative pole protection type lithium battery protection shield 12, this tester includes the first embodiment at least short circuit test circuit.
The tester can be a comprehensive tester besides the short circuit test circuit, and also has other functions such as overcharge test, overdischarge test, overcurrent test and the like.
The utility model discloses the third embodiment provides a method for carrying out short circuit test to negative pole protection type lithium battery protection board, adopt first embodiment short circuit test, as shown in fig. 3, this test method includes:
step a1, the capacitor with the smallest capacity in the capacitor assembly 22 is switched into the test loop by controlling the corresponding air switch.
Considering that different specifications of different battery protection boards are different, if the capacity of the accessed capacitor is too high, the battery protection board and the battery pack may be burnt, so that in the step, the capacitor with the minimum capacity is accessed, the threshold of the short circuit test is gradually increased, the short circuit test is adjusted from low to high, and the different capacities of the capacitors accessed in the test loop represent different current gears of the test loop.
Step A2, starting the indicating unit under the current gear of the current test loop, and if the state indication disappears, indicating that the current gear has short-circuit protection, and completing the test; if the state indication is kept, the current gear is indicated to have no short-circuit protection, and the next step is carried out.
Step A3, under the current gear of the current test loop, adjusting the pulse width of the pulse driving signal in a preset range to change the time gear, and after each adjustment, if the state indication disappears, indicating that the current time gear has short-circuit protection, and completing the test; and if the state indication is kept under all the time gears, indicating that short-circuit protection does not occur in all the time gears, and entering the next step.
The pulse width can be adjusted by combining the states of the single-pole double-throw switches S2 and S3 to realize different pulse widths, for example, in FIG. 2, the pulse widths can be switched on between 2-3 of S2, between 2-3 of S3, between 2-1 of S2, between 2-3 of S3, between 2-1 of S2, between 2-1 of S3, between 2-3 of S2 and between 2-1 of S3, and the MCU outputs pulse driving signals corresponding to the pulse widths according to different settings of the 14 th port and the 15 th port, so that different short-circuit time lengths can be realized.
And step A4, increasing the capacity of the capacitor connected into the test circuit by controlling the corresponding air switch to change the current gear, and returning to execute the step A2.
When the capacity of the capacitor is increased, a larger large-capacity capacitor in the capacitor assembly 22 can be controlled to be switched on through a single air switch, or a plurality of large-capacity capacitors in the capacitor assembly 22 can be controlled to be switched on through a plurality of air switches simultaneously, so that the short circuit test threshold is improved on the whole.
It can be seen that the whole test procedure involves two adjustment procedures: the method comprises the steps of adjusting current gears and time gears, adjusting the current gears by controlling a large-capacity capacitor connected into a test loop, adjusting the time gears by slowly increasing pulse time at each current gear, if protection is not detected, repeating the step of increasing the pulse width after the large-capacity capacitor of the test loop is increased until protection is available, and if all capacitors are connected and the pulse width is adjusted to the maximum value, the protection is still not protected, so that the negative electrode protection type lithium battery protection plate has no short-circuit protection function.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A short circuit test circuit of a negative electrode protection type lithium battery protection board is characterized in that the negative electrode protection type lithium battery protection board is provided with a protection circuit, a battery board anode B + used for being connected with a lithium battery anode, a battery board cathode B-, a discharge anode P + used for being connected with a lithium battery cathode, and a discharge cathode P-, a discharge switch tube is arranged between the battery board cathode B-and the discharge cathode P-, and the on-off state of the discharge switch tube is controlled by the protection circuit;
the short circuit test circuit includes:
the short circuit starting switch tube assembly is provided with a first end, a second end and a switch control end, and the first end of the short circuit starting switch tube assembly is connected with the discharge cathode P < - >;
the capacitor assembly is formed by connecting a plurality of large-capacity capacitors in parallel, and the first end of each large-capacity capacitor is connected to the second end of the short circuit starting switch tube assembly;
the air switch assembly is formed by connecting a plurality of air switches in parallel, the first ends of the air switches are correspondingly connected with the second ends of the high-capacity capacitors one by one, the second ends of the air switches are connected to the discharging anode P +, and each air switch is used for controlling the on-off between the corresponding high-capacity capacitor and the discharging anode P +;
an indicating unit which can be manually switched and is positioned on a power supply loop formed by the battery panel cathode B-and the discharging cathode P-, when the indicating unit is manually switched on, the battery panel cathode B-and the discharging cathode P-are switched on to have a state indication, the state indication disappears when the short-circuit protection is carried out on the protection circuit, and the state indication is kept when the short-circuit protection is not carried out on the protection circuit;
the controller is connected with the cathode B-of the battery panel and used for outputting a pulse driving signal with preset pulse width when the indicating unit is detected to indicate the state;
and the input end of the level conversion circuit receives the pulse driving signal, and the output end of the level conversion circuit is connected with the switch control end of the short-circuit starting switch tube assembly and is used for controlling the short-circuit starting switch tube assembly to be opened after the pulse driving signal is subjected to level conversion.
2. The short circuit test circuit of claim 1, wherein the short circuit enabled switching tube assembly comprises:
and the source electrode of each MOS tube is used as the first end, the drain electrode of each MOS tube is used as the second end, and the grid electrode of each MOS tube is used as the switch control end.
3. The short circuit test circuit of claim 1, wherein the manually switchable indication unit comprises:
a key S1, one end of which is connected with a 5V power circuit;
the anode of the first light emitting diode is connected to the other end of the key S1 through a resistor R16, and the cathode of the first light emitting diode is connected to the discharging cathode P-after passing through a first diode D1 and a second diode D2.
4. The short circuit test circuit of claim 3, wherein the controller has a power positive port, a power negative port, a status indication detection port, a pulse drive signal output port, a setup port;
the power supply positive electrode port is connected with the 5V power supply circuit; the power supply negative electrode port is connected with GND; the state indication detection port is connected with the other end of the key S1; the pulse driving signal output port is connected with the input end of the level conversion circuit; the setting port is connected with a single-pole double-throw switch for setting the pulse width of the pulse driving signal.
5. The short circuit test circuit of claim 4, wherein the positive power supply port and the negative power supply port of the controller are connected by a capacitor C6.
6. The short circuit test circuit of claim 4, wherein the 5V power supply circuit comprises: the three-terminal programmable voltage-stabilizing reference chip U1, a triode Q5, a resistor R1, a resistor R6, a resistor R7 and a capacitor C3;
the anode end of the three-terminal programmable voltage-stabilizing reference chip U1 is connected with GND, the cathode end of the three-terminal programmable voltage-stabilizing reference chip U1 is connected with the base electrode of the triode Q5, and the reference end of the three-terminal programmable voltage-stabilizing reference chip U1 is connected with the base electrode of the triode Q5 through the capacitor C3;
an emitter of the triode Q5 is used as a 5V voltage output end and is connected with one end of the key S1 and a power supply positive electrode port of the controller, the emitter is connected to GND through the resistor R1 and the resistor R6 in sequence, a serial connection position of the resistor R1 and the resistor R6 is connected with a reference end of the three-terminal programmable voltage-stabilizing reference chip U1, a collector of the triode Q5 is connected with an external 12V power supply, and the resistor R7 is connected between a grid electrode and a collector of the triode Q5.
7. The short circuit test circuit of claim 4, wherein the level shift circuit comprises: an NPN type triode Q11, an NPN type triode Q12 and a PNP type triode Q13;
the base electrode of the triode Q11 is connected with the pulse driving signal output port of the controller through a resistor, the collector electrode is connected with an external 12V power supply through a resistor, and the emitter electrode is connected with GND;
the base electrode of the triode Q12 is connected with the collector electrode of the triode Q11, the collector electrode of the triode Q12 is connected with an external 12V power supply, and the emitter electrode of the triode Q13 is connected;
the base electrode of the triode Q13 is connected with the collector electrode of the triode Q11, and the collector electrode is connected with GND;
and a node between the emitter of the transistor Q12 and the emitter of the transistor Q13 is used as an output end to be connected with the switch control end of the short circuit starting switch tube component.
8. The short circuit test circuit according to any one of claims 6 to 7, wherein the GND is connected to the panel negative B-through a resistor R20; a resistor R28 and a resistor R29 are connected in parallel between the discharge anode P + and the discharge cathode P-; the external 12V power supply is connected to GND through a resistor R24 and a second light emitting diode in sequence.
9. A tester for testing a negative electrode protection type lithium battery protection board, characterized in that the tester comprises at least the short circuit test circuit of any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922033378.2U CN211263692U (en) | 2019-11-22 | 2019-11-22 | Short circuit test circuit and tester of negative pole protection type lithium cell protection shield |
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| CN201922033378.2U CN211263692U (en) | 2019-11-22 | 2019-11-22 | Short circuit test circuit and tester of negative pole protection type lithium cell protection shield |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110736917A (en) * | 2019-11-22 | 2020-01-31 | 深圳市电将军科技有限公司 | Short circuit test circuit, tester and method for negative electrode protection type lithium battery protection board |
| CN117175723A (en) * | 2023-04-04 | 2023-12-05 | 扬州工业职业技术学院 | Multifunctional protection system of solid-state battery and control method thereof |
-
2019
- 2019-11-22 CN CN201922033378.2U patent/CN211263692U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110736917A (en) * | 2019-11-22 | 2020-01-31 | 深圳市电将军科技有限公司 | Short circuit test circuit, tester and method for negative electrode protection type lithium battery protection board |
| CN110736917B (en) * | 2019-11-22 | 2024-05-28 | 深圳市电将军科技有限公司 | Short circuit test circuit, tester and method for negative electrode protection type lithium battery protection board |
| CN117175723A (en) * | 2023-04-04 | 2023-12-05 | 扬州工业职业技术学院 | Multifunctional protection system of solid-state battery and control method thereof |
| CN117175723B (en) * | 2023-04-04 | 2024-03-01 | 扬州工业职业技术学院 | Multifunctional protection system of solid-state battery and control method thereof |
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