CN211786045U - Lithium cell group protection shield secondary overvoltage detection device - Google Patents
Lithium cell group protection shield secondary overvoltage detection device Download PDFInfo
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- CN211786045U CN211786045U CN201921954757.9U CN201921954757U CN211786045U CN 211786045 U CN211786045 U CN 211786045U CN 201921954757 U CN201921954757 U CN 201921954757U CN 211786045 U CN211786045 U CN 211786045U
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Abstract
The utility model provides a secondary overvoltage detection device for a lithium battery pack protection plate, which belongs to the technical field of lithium battery detection, and comprises a MCU, a high-speed ADC acquisition chip, an analog battery output circuit, a switch control circuit and a voltage and current acquisition circuit; one end of the MCU is connected with the switch control circuit, and the other end of the MCU is connected with the high-speed ADC acquisition chip; one end of the high-speed ADC acquisition chip is connected with the voltage and current acquisition circuit, and the other end of the high-speed ADC acquisition chip is connected with the analog battery output circuit; one end of the analog battery output circuit is connected with the MCU, and the other end of the analog battery output circuit is connected with the switch control circuit. The utility model has the advantages that: when the realization detects lithium cell group protection shield secondary overvoltage, detect the fuse and avoid the fuse to be fused, and need not additionally to increase auxiliary circuit.
Description
Technical Field
The utility model relates to a lithium cell detects technical field, indicates a lithium cell group protection shield secondary overvoltage detection device very much.
Background
The secondary overvoltage protection and recovery process of the lithium battery pack protection plate comprises the following steps: when the input voltage of the lithium battery pack reaches the secondary protection voltage, the protection board monitoring system enables the output level to drive the fuse, further the grounded MOSFET (metal oxide semiconductor field effect transistor) is conducted to form a loop, the voltage input to the lithium battery pack is instantly reduced, the overcharge of the lithium battery pack is prevented, and the fuse is prevented from being fused by large current; when the input voltage of the lithium battery pack is smaller than the secondary protection voltage, the MOSFET tube is disconnected, and the fuse restores to normal work.
Conventionally, the following method is adopted for secondary overvoltage detection of a lithium battery pack protection board: the method comprises the steps that 1, a fuse and an MOSFET tube are shielded, secondary overvoltage protection is triggered, and whether the secondary overvoltage protection function of a lithium battery pack protection plate is normal or not is indirectly judged by detecting the level which is enabled to be output by a protection plate monitoring system; and 2, directly triggering secondary overvoltage protection to conduct the MOSFET, enabling the fuse to flow current, and detecting whether the secondary overvoltage protection function of the lithium battery pack protection plate is normal or not by adding an auxiliary circuit.
However, method 1 has the following disadvantages: the voltage input into the lithium battery pack is not really reduced by the fuse, namely whether the fuse is normal or not is not detected, so that products with abnormal fuses can easily flow into the market; method 2 has the following disadvantages: because the constant voltage source of the front-section analog lithium battery pack for outputting the secondary protection voltage has no current-limiting resistor, the fuse is easy to be damaged by large-current impact, and the system is complicated due to the fact that the auxiliary circuit is added for detection.
Disclosure of Invention
The to-be-solved technical problem of the utility model lies in providing a lithium cell group protection shield secondary overvoltage detection device, when realizing that the protection shield secondary overvoltage of lithium cell group detects, detect and avoid the fuse to be fused to the fuse, and need not additionally to increase auxiliary circuit.
The utility model discloses a realize like this: a secondary overvoltage detection device for a lithium battery pack protection plate comprises an MCU, a high-speed ADC acquisition chip, an analog battery output circuit, a switch control circuit and a voltage and current acquisition circuit;
one end of the MCU is connected with the switch control circuit, and the other end of the MCU is connected with the high-speed ADC acquisition chip; one end of the high-speed ADC acquisition chip is connected with the voltage and current acquisition circuit, and the other end of the high-speed ADC acquisition chip is connected with the analog battery output circuit; one end of the analog battery output circuit is connected with the MCU, and the other end of the analog battery output circuit is connected with the switch control circuit.
Further, the analog battery output circuit comprises an operational amplifier N2A, an operational amplifier N2B, an operational amplifier N3A, an operational amplifier N3B, a MOSFET U1, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, and a resistor R33;
pin 1 of the operational amplifier N3A is connected with a resistor R14, pin 2 is connected with the resistor R4 and a high-speed ADC acquisition chip, and pin 3 is connected with the resistor R13; the resistor R14 is connected with the resistor R15 and the resistor R16; the gate of the MOSFET U1 is connected with a resistor R16, and the source is connected with the resistor R6, the resistor R33 and a switch control circuit; the resistor R33 is grounded; the resistor R13 is connected with the MCU;
a pin 5 of the operational amplifier N3B is connected with a resistor R12, a pin 6 is connected with the resistor R3 and a high-speed ADC acquisition chip, and a pin 7 is connected with the resistor R15; the resistor R12 is connected with the MCU;
pin 1 of the operational amplifier N2A is connected with a resistor R4 and a resistor R8, pin 2 is connected with the resistor R7 and the resistor R8, and pin 3 is connected with the resistor R6; the resistor R7 is grounded;
a pin 5 of the operational amplifier N2B is connected with a resistor R9, a pin 6 is connected with the resistor R10 and the resistor R11, and a pin 7 is connected with the resistor R3 and the resistor R11; the resistor R9 is connected with the resistor R5; the resistor R10 is connected to the resistor R5 and grounded.
Further, the switch control circuit comprises a MOSFET tube U2, a photocoupler U3, a resistor R1, a resistor R2 and a resistor R22;
a pin 1 of the photoelectric coupler U3 is connected with a resistor R1, a pin 2 is connected with a drain electrode of the MOSFET tube U2, a pin 3 is connected with the resistor R22 and an analog battery output circuit, and a pin 4 is connected with the resistor R22; the grid electrode of the MOSFET U2 is connected with the resistor R2, and the source electrode is grounded; the resistor R2 is connected with the MCU.
Further, the voltage and current acquisition circuit comprises an operational amplifier N1A, an operational amplifier N1B, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31 and a resistor R32;
pin 1 of the operational amplifier N1A is connected with a resistor R26 and a resistor R27, pin 2 is connected with a resistor R25 and a resistor R26, and pin 3 is connected with a resistor R23 and a resistor R24; the resistor R24 and the resistor R25 are both grounded; the resistor R27 is connected with the high-speed ADC acquisition chip;
a pin 7 of the operational amplifier N1B is connected with a resistor R31 and a resistor R32, a pin 6 is connected with the resistor R30 and the resistor R31, and a pin 5 is connected with the resistor R28 and the resistor R29; the resistor R28 is grounded; the resistor R32 is connected with the high-speed ADC acquisition chip.
Further, the model of the high-speed ADC acquisition chip is TMS320F 28377S.
The utility model has the advantages that:
the MCU is used for controlling an analog battery output circuit, voltage output of an analog lithium battery pack is performed on a protection board through the switch control circuit, secondary overvoltage protection of the protection board is triggered to enable a driving fuse to be conducted with the MOSFET to form a loop, current flows through the fuse, and detection of the fuse is achieved; meanwhile, the high-speed ADC acquisition chip quickly acquires the voltage and current change loaded on the protection board through a voltage and current acquisition circuit and feeds the voltage and current change back to the MCU to judge whether the secondary overvoltage protection function of the protection board is normal; the switch control circuit is arranged to effectively prevent the impact of the large current output by the analog battery output circuit on the fuse; when realizing that the protection shield secondary overvoltage of lithium cell group detects promptly, detect and avoid the fuse to be fused the fuse, and need not additionally to increase auxiliary circuit.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic circuit diagram of the secondary overvoltage detection device for the lithium battery pack protection board of the present invention.
Fig. 2 is a circuit diagram of the lithium battery pack protection board secondary overvoltage detection device of the utility model.
Fig. 3 is a circuit diagram of the switch control circuit of the present invention.
Fig. 4 is a circuit diagram of the battery output circuit according to the present invention.
Fig. 5 is a circuit diagram of the voltage current collecting circuit of the present invention.
Fig. 6 is a circuit diagram of the test protection board of the present invention.
Detailed Description
Referring to fig. 1 to 6, a preferred embodiment of a secondary overvoltage detection device for a lithium battery pack protection plate of the present invention includes an MCU, a high-speed ADC acquisition chip, an analog battery output circuit, a switch control circuit, and a voltage and current acquisition circuit; the MCU is used for controlling the on-off of the switch control circuit, controlling the analog battery output circuit to simulate the lithium battery pack to output voltage and monitoring the voltage and current change data acquired by the high-speed ADC acquisition chip, and in the specific implementation, the MCU capable of realizing the function is selected from the prior art and is not limited to any type, such as the type of the MCU ADuCM361, which can be obtained by technicians in the field without creative work; the high-speed ADC acquisition chip is used for quickly reading voltage and current change data acquired by the voltage and current acquisition circuit; the analog battery output circuit is used for simulating a lithium battery pack to output voltage; the switch control circuit is used for limiting the large current output by the analog battery output circuit so as to prevent the protection board from being impacted to further fuse the fuse and play a role of an isolation circuit; the voltage and current acquisition circuit is used for acquiring voltage and current data loaded on the protection plate;
one end of the MCU is connected with the switch control circuit, and the other end of the MCU is connected with the high-speed ADC acquisition chip; one end of the high-speed ADC acquisition chip is connected with the voltage and current acquisition circuit, and the other end of the high-speed ADC acquisition chip is connected with the analog battery output circuit; one end of the analog battery output circuit is connected with the MCU, and the other end of the analog battery output circuit is connected with the switch control circuit.
The analog battery output circuit comprises an operational amplifier N2A, an operational amplifier N2B, an operational amplifier N3A, an operational amplifier N3B, a MOSFET U1, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16 and a resistor R33;
pin 1 of the operational amplifier N3A is connected with a resistor R14, pin 2 is connected with the resistor R4 and a high-speed ADC acquisition chip, and pin 3 is connected with the resistor R13; the resistor R14 is connected with the resistor R15 and the resistor R16; the gate of the MOSFET U1 is connected with a resistor R16, and the source is connected with the resistor R6, the resistor R33 and a switch control circuit; the resistor R33 is grounded; the resistor R13 is connected with the MCU;
a pin 5 of the operational amplifier N3B is connected with a resistor R12, a pin 6 is connected with the resistor R3 and a high-speed ADC acquisition chip, and a pin 7 is connected with the resistor R15; the resistor R12 is connected with the MCU;
pin 1 of the operational amplifier N2A is connected with a resistor R4 and a resistor R8, pin 2 is connected with the resistor R7 and the resistor R8, and pin 3 is connected with the resistor R6; the resistor R7 is grounded;
a pin 5 of the operational amplifier N2B is connected with a resistor R9, a pin 6 is connected with the resistor R10 and the resistor R11, and a pin 7 is connected with the resistor R3 and the resistor R11; the resistor R9 is connected with the resistor R5; the resistor R10 is connected to the resistor R5 and grounded.
The switch control circuit comprises a MOSFET (metal oxide semiconductor field effect transistor) U2, a photoelectric coupler U3, a resistor R1, a resistor R2 and a resistor R22; the resistor R22 is a current-limiting resistor and is used for preventing the large current output by the analog battery output circuit from impacting the fuse of the protection board; the photoelectric coupler U3 enables the input and the output of the switch circuit to be completely isolated electrically, and the influence of the large current output by the analog battery output circuit on the MCU is avoided;
a pin 1 of the photoelectric coupler U3 is connected with a resistor R1, a pin 2 is connected with a drain electrode of the MOSFET tube U2, a pin 3 is connected with the resistor R22 and an analog battery output circuit, and a pin 4 is connected with the resistor R22; the grid electrode of the MOSFET U2 is connected with the resistor R2, and the source electrode is grounded; the resistor R2 is connected with the MCU; the resistor R22 is connected to the protection board.
The voltage and current acquisition circuit comprises an operational amplifier N1A, an operational amplifier N1B, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31 and a resistor R32; the models of the operational amplifier N1A, the operational amplifier N1B, the operational amplifier N2A, the operational amplifier N2B, the operational amplifier N3A and the operational amplifier N3B are all OPA2188 and are used for amplifying signals;
pin 1 of the operational amplifier N1A is connected with a resistor R26 and a resistor R27, pin 2 is connected with a resistor R25 and a resistor R26, and pin 3 is connected with a resistor R23 and a resistor R24; the resistor R24 and the resistor R25 are both grounded; the resistor R27 is connected with the high-speed ADC acquisition chip;
a pin 7 of the operational amplifier N1B is connected with a resistor R31 and a resistor R32, a pin 6 is connected with the resistor R30 and the resistor R31, and a pin 5 is connected with the resistor R28 and the resistor R29; the resistor R28 is grounded; the resistor R32 is connected with the high-speed ADC acquisition chip; the resistor R23, the resistor R29 and the resistor R30 are all connected with the protection board.
The model of the high-speed ADC acquisition chip is TMS320F 28377S.
The utility model discloses the theory of operation:
referring to fig. 6, the conventional protection board includes a fuse F1, a MOSFET Q1, a MOSFET Q2, and a MOSFET Q3, a B +/B-terminal voltage triggering the MOSFET Q1 and the MOSFET Q2 to turn off is a primary protection voltage, a voltage triggering the MOSFET Q3 to turn on and pull down the fuse F1 is a secondary protection voltage, and a time T from the start of voltage loading to the secondary protection voltage is a secondary overvoltage protection delay.
The MCU enables the control switch control circuit to be conducted, controls the analog battery output circuit to output voltage to the protection board, and starts an internal timer to time, wherein the starting time is T1; after a period of time, the input voltage of the protection board reaches the secondary protection voltage, the B +/B-terminal voltage of the protection board is pulled down, and a loop output current is formed by the B +/B-terminal voltage and the front-terminal voltage; the high-speed ADC acquisition chip acquires the variation of the voltage of the B +/B-end of the protection board which is pulled down through a voltage and current acquisition circuit, acquires the variation of the instantaneous pull-up of the current value in the analog battery output circuit, and feeds data back to the MCU; the MCU receives the voltage current variation fed back by the high-speed ADC acquisition chip at the time T2, the secondary overvoltage protection function of the protection board is normal, and the time T2-T1 is secondary overvoltage protection delay; and if the MCU does not receive the voltage current variation fed back by the ADC acquisition chip, the secondary overvoltage protection function of the protection plate is abnormal.
To sum up, the utility model has the advantages that:
the MCU is used for controlling an analog battery output circuit, voltage output of an analog lithium battery pack is performed on a protection board through the switch control circuit, secondary overvoltage protection of the protection board is triggered to enable a driving fuse to be conducted with the MOSFET to form a loop, current flows through the fuse, and detection of the fuse is achieved; meanwhile, the high-speed ADC acquisition chip quickly acquires the voltage and current change loaded on the protection board through a voltage and current acquisition circuit and feeds the voltage and current change back to the MCU to judge whether the secondary overvoltage protection function of the protection board is normal; the switch control circuit is arranged to effectively prevent the impact of the large current output by the analog battery output circuit on the fuse; when realizing that the protection shield secondary overvoltage of lithium cell group detects promptly, detect and avoid the fuse to be fused the fuse, and need not additionally to increase auxiliary circuit.
Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.
Claims (5)
1. The utility model provides a lithium cell group protection shield secondary overvoltage detection device which characterized in that: the device comprises an MCU, a high-speed ADC acquisition chip, an analog battery output circuit, a switch control circuit and a voltage and current acquisition circuit;
one end of the MCU is connected with the switch control circuit, and the other end of the MCU is connected with the high-speed ADC acquisition chip; one end of the high-speed ADC acquisition chip is connected with the voltage and current acquisition circuit, and the other end of the high-speed ADC acquisition chip is connected with the analog battery output circuit; one end of the analog battery output circuit is connected with the MCU, and the other end of the analog battery output circuit is connected with the switch control circuit.
2. The lithium battery pack protection board secondary overvoltage detection device as claimed in claim 1, wherein: the analog battery output circuit comprises an operational amplifier N2A, an operational amplifier N2B, an operational amplifier N3A, an operational amplifier N3B, a MOSFET U1, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16 and a resistor R33;
pin 1 of the operational amplifier N3A is connected with a resistor R14, pin 2 is connected with the resistor R4 and a high-speed ADC acquisition chip, and pin 3 is connected with the resistor R13; the resistor R14 is connected with the resistor R15 and the resistor R16; the gate of the MOSFET U1 is connected with a resistor R16, and the source is connected with the resistor R6, the resistor R33 and a switch control circuit; the resistor R33 is grounded; the resistor R13 is connected with the MCU;
a pin 5 of the operational amplifier N3B is connected with a resistor R12, a pin 6 is connected with the resistor R3 and a high-speed ADC acquisition chip, and a pin 7 is connected with the resistor R15; the resistor R12 is connected with the MCU;
pin 1 of the operational amplifier N2A is connected with a resistor R4 and a resistor R8, pin 2 is connected with the resistor R7 and the resistor R8, and pin 3 is connected with the resistor R6; the resistor R7 is grounded;
a pin 5 of the operational amplifier N2B is connected with a resistor R9, a pin 6 is connected with the resistor R10 and the resistor R11, and a pin 7 is connected with the resistor R3 and the resistor R11; the resistor R9 is connected with the resistor R5; the resistor R10 is connected to the resistor R5 and grounded.
3. The lithium battery pack protection board secondary overvoltage detection device as claimed in claim 1, wherein: the switch control circuit comprises a MOSFET (metal oxide semiconductor field effect transistor) U2, a photoelectric coupler U3, a resistor R1, a resistor R2 and a resistor R22;
a pin 1 of the photoelectric coupler U3 is connected with a resistor R1, a pin 2 is connected with a drain electrode of the MOSFET tube U2, a pin 3 is connected with the resistor R22 and an analog battery output circuit, and a pin 4 is connected with the resistor R22; the grid electrode of the MOSFET U2 is connected with the resistor R2, and the source electrode is grounded; the resistor R2 is connected with the MCU.
4. The lithium battery pack protection board secondary overvoltage detection device as claimed in claim 1, wherein: the voltage and current acquisition circuit comprises an operational amplifier N1A, an operational amplifier N1B, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31 and a resistor R32;
pin 1 of the operational amplifier N1A is connected with a resistor R26 and a resistor R27, pin 2 is connected with a resistor R25 and a resistor R26, and pin 3 is connected with a resistor R23 and a resistor R24; the resistor R24 and the resistor R25 are both grounded; the resistor R27 is connected with the high-speed ADC acquisition chip;
a pin 7 of the operational amplifier N1B is connected with a resistor R31 and a resistor R32, a pin 6 is connected with the resistor R30 and the resistor R31, and a pin 5 is connected with the resistor R28 and the resistor R29; the resistor R28 is grounded; the resistor R32 is connected with the high-speed ADC acquisition chip.
5. The lithium battery pack protection board secondary overvoltage detection device as claimed in claim 1, wherein: the model of the high-speed ADC acquisition chip is TMS320F 28377S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921954757.9U CN211786045U (en) | 2019-11-13 | 2019-11-13 | Lithium cell group protection shield secondary overvoltage detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921954757.9U CN211786045U (en) | 2019-11-13 | 2019-11-13 | Lithium cell group protection shield secondary overvoltage detection device |
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| CN211786045U true CN211786045U (en) | 2020-10-27 |
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| CN201921954757.9U Active CN211786045U (en) | 2019-11-13 | 2019-11-13 | Lithium cell group protection shield secondary overvoltage detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113049970A (en) * | 2021-03-19 | 2021-06-29 | 东莞新能德科技有限公司 | Battery protection plate, battery and detection method |
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2019
- 2019-11-13 CN CN201921954757.9U patent/CN211786045U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113049970A (en) * | 2021-03-19 | 2021-06-29 | 东莞新能德科技有限公司 | Battery protection plate, battery and detection method |
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