CN212031664U - Over-current protection current and delay time detection device for lithium battery protection circuit board - Google Patents
Over-current protection current and delay time detection device for lithium battery protection circuit board Download PDFInfo
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- CN212031664U CN212031664U CN202020607488.5U CN202020607488U CN212031664U CN 212031664 U CN212031664 U CN 212031664U CN 202020607488 U CN202020607488 U CN 202020607488U CN 212031664 U CN212031664 U CN 212031664U
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Abstract
The utility model discloses a device for detecting overcurrent protection current and delay time of a lithium battery protection circuit board, which comprises an adjustable direct current stabilized power supply, the output end of the adjustable direct current stabilized power supply is connected with a digital voltmeter in parallel, the positive electrode of the output end of the adjustable direct current stabilized power supply is connected with the positive electrode of the input end of the protection circuit board to be detected through a KM1-1 normally open contact, the negative electrode of the input end of the protection circuit board to be detected is connected with the negative electrode of the input end of the protection circuit board to be detected, the positive electrode of the output end of the protection circuit board to be detected passes through the digital ammeter and then passes through the Hall current sensor, then is connected with the load resistor through a KM2-2 normally open contact and then is connected with the negative electrode of the output end of the protection circuit board to be detected, the Hall current sensor is connected with a digital oscilloscope, a working power supply AC 220V/50; the utility model has the advantages that: the overcurrent protection current and the delay time of the protection circuit board are conveniently and accurately tested.
Description
Technical Field
The utility model belongs to the technical field of electric power, concretely relates to lithium battery protection circuit board overcurrent protection electric current and delay time detection device.
Background
The lithium battery is widely applied to the direct current electric tool, the protection function of the lithium battery pack discharge protection circuit board directly influences the use safety and the service life of the battery, when the discharge current of the lithium battery pack reaches the overcurrent protection current value of the protection circuit board, overcurrent protection of the protection circuit board is started, the output circuit is cut off after output is kept for a certain time, and the battery pack is stopped to discharge to a load. The time is about 1-3 s, which is the overdischarge protection delay time of the protection circuit board. At present, the overcurrent protection delay time of a large-current discharge protection circuit board of a lithium battery pack is tested more complexly, and the working efficiency is lower.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned limitation, for detecting protection circuit board overcurrent protection electric current and overcurrent protection delay time, disclose a protection circuit board overcurrent protection electric current and delay time detection device, can make things convenient for, accurately test protection circuit board's overcurrent protection electric current and delay time through this device.
The purpose of the utility model is realized through the following technical scheme: the overcurrent protection current and delay time detection device for the lithium battery protection circuit board comprises an adjustable direct-current stabilized power supply, wherein the output end of the adjustable direct-current stabilized power supply is connected with a digital voltmeter in parallel, the anode of the adjustable direct-current stabilized power supply is connected with the anode of the input end of the protection circuit board to be detected through a KM1-1 normally open contact, the cathode of the adjustable direct-current stabilized power supply is connected with the cathode of the input end of the protection circuit board to be detected, the anode of the output end of the protection circuit board to be detected passes through a Hall current sensor after passing through a digital ammeter, and is connected with the cathode of the output end of the protection circuit board to be detected after being connected with a load resistor through a KM2-2 normally open contact, the Hall current sensor is connected with a digital oscilloscope, a working power supply AC220V/50Hz is connected with a normally closed button switch without lock, the normally closed button switch without lock and an alternating current contactor KM The contactor KM2 forms a self-locking circuit, the Hall current sensor is externally connected with a DC +/-12V power supply, the digital ammeter is used for rapidly and accurately reading the overcurrent protection current value, the digital oscilloscope is used for capturing current pulses acquired by the Hall current sensor, and the read pulse width is the overcurrent protection delay time of the protection circuit board to be tested.
Preferably, the KM1-1 normally open contact and the KM2-2 normally open contact are normally open contacts or manual switches of the AC contactors KM1 and KM2, respectively.
Preferably, the KM1-1 normally open contact is a switch formed by connecting three groups of main contacts of an alternating current contactor KM1 in parallel, the KM2-1 normally open contact is a normally open contact of an auxiliary contact of an alternating current contactor KM2, and the KM2-2 normally open contact is a switch formed by connecting three groups of main contacts of an alternating current contactor KM2 in parallel.
To sum up, the utility model has the advantages of it is following: the overcurrent protection current and the delay time of the protection circuit board can be conveniently and accurately tested, whether the protection function of the protection circuit board is normal or not is judged, and unqualified protection circuit boards are avoided, so that the use safety and the service life of the lithium battery are guaranteed.
Drawings
FIG. 1 is a circuit diagram of the present invention;
reference numbers in the figures: the device comprises 1-an adjustable direct current stabilized power supply, 2-a digital voltmeter, 3-KM1-1 normally open contacts, 4-a tested protection circuit board, 5-a digital ammeter, 6-a Hall current sensor, 7-KM2-2 normally open contacts, 8-a load resistor, 9-a digital oscilloscope, 10-a lock-free normally closed button switch, 11-a lock-free normally open button switch, 12-KM2-1 normally open contacts, 13-DC +/-12V power supply, 14-an alternating current contactor KM1 and 15-an alternating current contactor KM 2.
Detailed Description
In order to deepen the understanding of the present invention, the present invention will be further described in detail with reference to the following embodiments and the attached drawings, and the embodiments are only used for explaining the present invention, and do not constitute the limitation to the protection scope of the present invention.
Example (b): the utility model provides a lithium battery protection circuit board overcurrent protection current and delay time detection device, including adjustable direct current constant voltage power supply 1, adjustable direct current constant voltage power supply 1 output connects in parallel a digital voltmeter 2, adjustable direct current constant voltage power supply 1 positive pole is through KM1-1 normally open contact 3 connection measured protection circuit board 4 input positive pole, adjustable direct current constant voltage power supply 1 negative pole is connected the protection circuit board 4 input negative pole of being measured, measured protection circuit board 4 output positive pole passes hall current sensor 6 behind digital ampere meter 5, and inserts measured protection circuit board 4 output negative pole after being connected with load resistance 8 through KM2-2 normally open contact 7, load resistance 8 adopts the combination of fixed resistance and high-power rheostat, hall current sensor 6 connects digital oscilloscope 9, detection device working power supply AC220V/50Hz with do not take lock normally closed button switch 10 and be connected, the normally closed button switch 10 without lock and the alternating current contactor KM 114 form a circuit for stopping operation and protecting a circuit board, the normally closed button switch 10 without lock, the normally open button switch 11 without lock, the KM2-1 normally open contact 12 and the alternating current contactor KM 215 form a self-locking circuit, and the Hall current sensor 6 is externally connected with a DC +/-12V power supply 13.
The KM1-1 normally open contact 3 and the KM2-2 normally open contact 7 are normally open contacts or manual switches of an alternating current contactor KM 114 and an alternating current contactor KM 215 respectively, and when the manual switches are adopted, the normally closed push-button switch 10 without a lock, the normally open push-button switch 11 without a lock, the alternating current contactor KM 114 and the alternating current contactor KM 215 do not need to be installed.
The KM1-1 normally open contact 3 is a switch formed by connecting three groups of main contacts of an alternating current contactor KM 114 in parallel, the KM2-1 normally open contact 12 is a normally open contact of an auxiliary contact of the alternating current contactor KM 215, and the KM2-2 normally open contact 7 is a switch formed by connecting three groups of main contacts of the alternating current contactor KM 215 in parallel.
In operation, the power supply is switched on, and the adjustable direct current stabilized power supply 1 is adjusted to the rated working voltage of the protection circuit board 4 to be tested, such as 20.5V.
Overcurrent protection current detection: and (3) adjusting the load resistor 8 to the maximum, firstly pressing the normally closed button switch 10 without the lock, then pressing the normally open button switch 11 without the lock to close the KM2-2 normally open contact 7, slowly reducing the load resistor 8 until the reading of the digital ammeter 5 jumps from n to 0, and recording the current value n before jumping, namely the overcurrent protection current value of the protection circuit board 4 to be tested.
Overcurrent protection delay time detection: the load resistance 8 is adjusted to be minimum, the protection circuit board 4 to be tested is enabled to work in an overcurrent protection state, the normally closed button switch 10 without the lock is pressed, then the normally open button switch 11 without the lock is pressed, the KM2-2 normally open contact 7 is closed, the digital oscilloscope 9 is used for capturing the current pulse which is collected by the Hall current sensor 5 at the moment when the KM2-2 normally open contact 7 is switched on, and the read current pulse width is the overcurrent protection delay time of the protection circuit board 4 to be tested.
Claims (3)
1. The utility model provides a lithium battery protection circuit board overcurrent protection electric current and delay time detection device which characterized in that: the device comprises an adjustable direct current stabilized power supply (1), wherein the output end of the adjustable direct current stabilized power supply (1) is connected with a digital voltmeter (2) in parallel, the anode of the adjustable direct current stabilized power supply (1) is connected with the anode of the input end of a tested protection circuit board (4) through a KM1-1 normally-open contact (3), the cathode of the adjustable direct current stabilized power supply (1) is connected with the cathode of the input end of the tested protection circuit board (4), the anode of the output end of the tested protection circuit board (4) passes through a Hall current sensor (6) after passing through a digital ammeter (5), and then is connected with a load resistor (8) through a KM2-2 normally-open contact (7) and then is connected with the cathode of the output end of the tested protection circuit board (4), the Hall current sensor (6) is connected with a digital oscilloscope (9), and a detection device working power supply AC220V, the normally closed button switch (10) without the lock, the alternating current contactor KM1(14) form a circuit for stopping operation and protecting a circuit board, the normally closed button switch (10) without the lock, the normally open button switch (11) without the lock, the KM2-1 normally open contact (12) and the alternating current contactor KM2(15) form a self-locking circuit, and the Hall current sensor (6) is externally connected with a DC +/-12V power supply (13).
2. The device for detecting the overcurrent protection current and the delay time of the lithium battery protection circuit board according to claim 1, wherein: the KM1-1 normally open contact (3) and the KM2-2 normally open contact (7) are normally open contacts or manual switches of an alternating current contactor KM1(14) and an alternating current contactor KM2(15), respectively.
3. The device for detecting the overcurrent protection current and the delay time of the lithium battery protection circuit board according to claim 1, wherein: the KM1-1 normally open contact (3) is a switch formed by connecting three groups of main contacts of an alternating current contactor KM1(14) in parallel, the KM2-1 normally open contact (12) is a normally open contact of an auxiliary contact of an alternating current contactor KM2(15), and the KM2-2 normally open contact (7) is a switch formed by connecting three groups of main contacts of an alternating current contactor KM2(15) in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020607488.5U CN212031664U (en) | 2020-04-21 | 2020-04-21 | Over-current protection current and delay time detection device for lithium battery protection circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020607488.5U CN212031664U (en) | 2020-04-21 | 2020-04-21 | Over-current protection current and delay time detection device for lithium battery protection circuit board |
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| CN212031664U true CN212031664U (en) | 2020-11-27 |
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| CN202020607488.5U Active CN212031664U (en) | 2020-04-21 | 2020-04-21 | Over-current protection current and delay time detection device for lithium battery protection circuit board |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986800A (en) * | 2021-02-19 | 2021-06-18 | 合肥宏晶微电子科技股份有限公司 | POR circuit testing method and device |
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2020
- 2020-04-21 CN CN202020607488.5U patent/CN212031664U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986800A (en) * | 2021-02-19 | 2021-06-18 | 合肥宏晶微电子科技股份有限公司 | POR circuit testing method and device |
| CN112986800B (en) * | 2021-02-19 | 2024-04-09 | 宏晶微电子科技股份有限公司 | POR circuit testing method and device |
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