CN213341634U - Overvoltage protection circuit of multi-string lithium battery pack - Google Patents
Overvoltage protection circuit of multi-string lithium battery pack Download PDFInfo
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- CN213341634U CN213341634U CN202022459425.2U CN202022459425U CN213341634U CN 213341634 U CN213341634 U CN 213341634U CN 202022459425 U CN202022459425 U CN 202022459425U CN 213341634 U CN213341634 U CN 213341634U
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Abstract
The utility model discloses an overvoltage crowbar of many strings of lithium cell group relates to battery technical field, and this overvoltage crowbar includes: many strings of lithium cell group, steady voltage boost circuit, overvoltage protection driver, MOS pipe and three-terminal fuse, three-terminal fuse establishes ties in the series circuit of lithium cell, the both ends of every lithium cell are connected to the overvoltage protection driver through the steady voltage boost circuit who corresponds respectively, the grid of MOS pipe is connected to the overvoltage protection driver, the control end of three-terminal fuse is connected to the drain electrode of MOS pipe, many strings of lithium cell group are connected to the source electrode, this circuit increases three-terminal fuse, can avoid the problem that the trouble can not in time cut off circuit that leads to reliably steadily, and can be in the disconnection charging circuit, discharge circuit has also been broken off. And the voltage-stabilizing booster circuit improves the overvoltage protection value of the lithium battery, and can protect under the more ideal voltage value of experimental fitting, thereby further improving the reliability.
Description
Technical Field
The utility model belongs to the technical field of the battery technique and specifically relates to an overvoltage crowbar of many strings of lithium cell group.
Background
The key of ensuring circuit safety is to cut off a loop in time when any one string of electric core in a multi-string lithium battery pack exceeds the highest safe charging voltage or exceeds the set maximum current, therefore, an MOS tube is usually added in the existing multi-string lithium battery pack, when any one string of electric core in the battery pack exceeds the highest safe charging voltage or exceeds the set maximum current, overcharge and overcurrent power-off are executed through the MOS tube, however, the MOS tube or a circuit breaker is used as an electrical appliance element and has certain fault probability, when the MOS tube or the circuit breaker fails to cut off the circuit once, the multi-string lithium battery pack is extremely easy to cause vicious accidents such as fire, explosion and the like during overvoltage charging or overcurrent charging and discharging, and the existing method can cut off the multi-string lithium battery pack charging circuit to ensure that the multi-string lithium battery pack cannot be charged, but the circuit can still discharge.
SUMMERY OF THE UTILITY MODEL
The inventor of the present invention provides an overvoltage protection circuit of many strings of lithium cell group to above-mentioned problem and technical demand, the technical scheme of the utility model as follows:
an overvoltage protection circuit for a multi-string lithium battery pack, the overvoltage protection circuit comprising: the device comprises a plurality of lithium battery packs, a voltage stabilizing and boosting circuit, an overvoltage protection driver, an MOS (metal oxide semiconductor) tube and a three-terminal fuse;
the multi-string lithium battery pack comprises a plurality of lithium batteries connected in series, three-terminal fuses are connected in series in a series circuit of the lithium batteries, two ends of each lithium battery are respectively connected to an overvoltage protection driver through corresponding voltage stabilizing and boosting circuits, the overvoltage protection driver is connected with a grid electrode of an MOS (metal oxide semiconductor) tube, a drain electrode of the MOS tube is connected with a control end of the three-terminal fuses, and a source electrode of the MOS tube is connected with the multi-string lithium battery pack;
the voltage stabilizing and boosting circuit comprises a voltage stabilizing chip, the anode of the lithium battery is connected with a VCC chip of the voltage stabilizing chip through a first resistor, the cathode of the lithium battery is connected with a GND pin of the voltage stabilizing chip, and a second resistor, a third resistor and a first capacitor are sequentially connected in parallel between the VCC pin and the GND pin of the voltage stabilizing chip; the CS pin of the voltage stabilizing chip is in short circuit with the GND pin, the OC pin of the voltage stabilizing chip is connected with the anode of the diode, the cathode of the diode is connected with the base of the triode through a fourth resistor, the emitting electrode of the triode is connected with the anode of the lithium battery, and the collecting electrode of the triode is connected with the input end of the overvoltage protection driver through a fifth resistor.
The further technical scheme is that the resistance values of the first resistor, the second resistor and the third resistor are all 100 omega, the first capacitor is 0.1uF, the resistance value of the fourth resistor is 20 kOmega, the resistance value of the fifth resistor is 1 kOmega, the diode adopts IN4148, and the voltage stabilizing and boosting circuit converts the 4.25V overvoltage protection value of the lithium battery into 5V and provides the 5V to the overvoltage protection driver.
The further technical scheme is that a temperature sensor and an electrolyte gas sensor are further arranged on each lithium battery, and the temperature sensor and the electrolyte gas sensor are connected to the overvoltage protection driver.
The utility model has the beneficial technical effects that:
the application discloses overvoltage crowbar of many strings of lithium cell group, this circuit increases three-terminal fuse, can avoid MOS pipe or circuit breaker to break down and the problem that can not in time cut off circuit steadily reliably, can break off charging circuit in addition, also broken off discharge circuit. And the voltage-stabilizing booster circuit improves the overvoltage protection value of the lithium battery, and can protect under the more ideal voltage value of experimental fitting, thereby further improving the reliability.
Drawings
Fig. 1 is a circuit diagram of an overvoltage protection circuit of a multi-string lithium battery pack disclosed in the present application.
Detailed Description
The following describes the embodiments of the present invention with reference to the accompanying drawings.
The application discloses overvoltage crowbar lithium cell group's overvoltage crowbar please refer to fig. 1, this overvoltage crowbar includes: the device comprises a multi-string lithium battery pack, a voltage stabilizing and boosting circuit, an overvoltage protection driver, a MOS (metal oxide semiconductor) tube M1 and a three-terminal fuse F1. The multi-string lithium battery pack comprises a plurality of lithium batteries (B1 and B2 … … Bn in the figure) which are connected in series, and a three-terminal fuse F1 is connected in series in a series circuit of the lithium batteries. Two ends of each lithium battery are respectively connected to an overvoltage protection driver (Voltage Sensing and OVP Drive) through corresponding Voltage stabilizing and boosting circuits, the overvoltage protection driver is connected with a grid electrode of the MOS tube M1, a drain electrode of the MOS tube M1 is connected with a control end of the three-terminal fuse F1, and a source electrode of the MOS tube M1 is connected with the multi-string lithium battery pack.
The structures of the voltage stabilizing and boosting circuits connected with the lithium batteries are the same, and fig. 1 only shows one of the voltage stabilizing and boosting circuits. Every steady voltage boost circuit includes the steady voltage chip, and the positive pole of lithium cell connects the VCC chip of steady voltage chip, the GND pin of steady voltage chip through first resistance R1, and it has second resistance R2, third resistance R3 and first electric capacity C1 still to have parallelly connected in proper order between the VCC pin of steady voltage chip and the GND pin. And the CS pin of the voltage stabilizing chip is in short circuit with the GND pin. The OC pin of the voltage-stabilizing chip is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the base of the triode Q1 through the fourth resistor R4, the emitting electrode of the triode Q1 is connected with the anode of the lithium battery, and the collecting electrode of the triode Q1 is connected with the input end of the overvoltage protection driver through the fifth resistor R5.
IN the present application, the resistances of the first resistor R1, the second resistor R2 and the third resistor R3 are all 100 Ω, the first capacitor C1 is 0.1uF, the resistance of the fourth resistor R4 is 20k Ω, the resistance of the fifth resistor R5 is 1k Ω, and the diode D1 is IN 4148. The overvoltage protection value of the primary protection of the standard lithium battery is 4.25V, the overvoltage protection value of the 4.25V of the lithium battery can be converted into 5V serving as the overvoltage voltage value of the secondary protection through the voltage stabilizing and boosting circuit and is supplied to the overvoltage protection driver, and the overvoltage voltage value of the 5V of the secondary protection is obtained by continuous test fitting of an applicant and has a better protection effect.
In addition, this application still is provided with temperature sensor and electrolyte gas sensor on every lithium cell, and temperature sensor and electrolyte gas sensor all are connected to the overvoltage protection driver to can also carry out secondary protection when temperature sensor detects temperature anomaly and/or electrolyte gas sensor detects electrolyte and leaks.
What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiments. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and scope of the present invention are to be considered as included within the scope of the present invention.
Claims (3)
1. An overvoltage protection circuit for a multi-string lithium battery pack, the overvoltage protection circuit comprising: the device comprises a plurality of lithium battery packs, a voltage stabilizing and boosting circuit, an overvoltage protection driver, an MOS (metal oxide semiconductor) tube and a three-terminal fuse;
the multi-string lithium battery pack comprises a plurality of lithium batteries connected in series, the three-terminal fuse is connected in series in a series circuit of the lithium batteries, two ends of each lithium battery are respectively connected to the overvoltage protection driver through corresponding voltage stabilizing and boosting circuits, the overvoltage protection driver is connected with a grid electrode of the MOS tube, a drain electrode of the MOS tube is connected with a control terminal of the three-terminal fuse, and a source electrode of the MOS tube is connected with the multi-string lithium battery pack;
the voltage stabilization booster circuit comprises a voltage stabilization chip, the anode of the lithium battery is connected with a VCC chip of the voltage stabilization chip through a first resistor, the cathode of the lithium battery is connected with a GND pin of the voltage stabilization chip, and a second resistor, a third resistor and a first capacitor are sequentially connected in parallel between the VCC pin and the GND pin of the voltage stabilization chip; the CS pin and the GND pin of steady voltage chip short circuit, the positive pole of diode is connected to the OC pin of steady voltage chip, the base of triode is passed through fourth ohmic connection to the negative pole of diode, the projecting pole of triode is connected the positive pole of lithium cell, the collecting electrode of triode passes through fifth ohmic connection the input of overvoltage protection driver.
2. The overvoltage protection circuit according to claim 1, wherein the first resistor, the second resistor and the third resistor are all 100 Ω, the first capacitor is 0.1uF, the fourth resistor is 20k Ω, the fifth resistor is 1k Ω, the diode is IN4148, and the voltage stabilizing and boosting circuit converts the 4.25V overvoltage protection value of the lithium battery into 5V and provides the 5V to the overvoltage protection driver.
3. Overvoltage protection circuit according to claim 1 or 2, characterized in that a temperature sensor and an electrolyte gas sensor are also provided on each lithium battery, both connected to the overvoltage protection driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022459425.2U CN213341634U (en) | 2020-10-29 | 2020-10-29 | Overvoltage protection circuit of multi-string lithium battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022459425.2U CN213341634U (en) | 2020-10-29 | 2020-10-29 | Overvoltage protection circuit of multi-string lithium battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213341634U true CN213341634U (en) | 2021-06-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022459425.2U Active CN213341634U (en) | 2020-10-29 | 2020-10-29 | Overvoltage protection circuit of multi-string lithium battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213341634U (en) |
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2020
- 2020-10-29 CN CN202022459425.2U patent/CN213341634U/en active Active
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