CN112165076A - Lithium battery secondary overvoltage overcharge-prevention protection system and control method - Google Patents
Lithium battery secondary overvoltage overcharge-prevention protection system and control method Download PDFInfo
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- CN112165076A CN112165076A CN202011137482.7A CN202011137482A CN112165076A CN 112165076 A CN112165076 A CN 112165076A CN 202011137482 A CN202011137482 A CN 202011137482A CN 112165076 A CN112165076 A CN 112165076A
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- control
- resistor
- lithium battery
- tube
- terminal fuse
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00308—Overvoltage protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a lithium battery secondary overvoltage overcharge protection system and a control method thereof, wherein the system comprises: the control chip is used for receiving a voltage signal of the lithium battery, outputting a driving signal to the switching tube and outputting a control signal to the three-terminal fuse; the switch tube is connected with the negative electrode of the lithium battery, the switch tube is connected with the three-terminal fuse through the patch nut and is connected with the three-terminal fuse in a bolt mode, so that the switch tube is connected with the three-terminal fuse in series, the three-terminal fuse is connected with the negative electrode of the load or the charger, and the switch tube is directly output to the load or the charger. When the switch tube is not in failure, the control chip fails to monitor or the voltage of the lithium battery jumps, the three-terminal fuse cannot be triggered, normal work of the system is guaranteed, when the switch tube is in failure but the control chip monitors that the voltage of the battery reaches a limit set threshold value, the control chip sends a driving signal to control the three-terminal fuse to be fused so as to cut off a main negative circuit to be disconnected for charging, and therefore the effect of preventing overcharge due to secondary overvoltage is achieved.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, relates to a lithium battery protection control technology, and particularly relates to a lithium battery secondary overvoltage and overcharge protection system and a control method.
Background
The conventional lithium battery protection system generally comprises a control chip, a switching tube and a three-terminal fuse, and the switching tube is controlled to be opened and closed by monitoring the state of a lithium battery through the control chip, so that the charging opening and closing effects are achieved. When the switching tubes are completely damaged, the control chip directly controls the three-terminal fuse to be fused when monitoring that the lithium battery continues to be charged, so that the charging main loop is disconnected permanently. However, because many lithium battery protection systems output at the same port, the main circuit is cut off by controlling the positive electrode, which causes complexity of the main positive circuit, and meanwhile, the chip misjudgment is easily controlled to cause the false triggering of the three-terminal fuse, thereby easily causing system failure and difficult maintenance.
Disclosure of Invention
In order to solve the technical problems of complexity of the existing lithium battery secondary overvoltage overcharge protection system installed on a main positive circuit and maintenance after the system fails, the invention provides the lithium battery secondary overvoltage overcharge protection system.
In order to achieve the purpose, the invention provides the following technical scheme:
the lithium battery secondary overvoltage overcharge-prevention protection system comprises a control chip, a switching tube and a three-terminal fuse, wherein the control chip is used for receiving a voltage signal of a lithium battery, outputting a driving signal to the switching tube and outputting a control signal to the three-terminal fuse; the switching tube is further connected with the negative electrode of the lithium battery, the switching tube is in bolted connection with the three-terminal fuse through the patch nut, so that the switching tube is connected with the three-terminal fuse in series, and the three-terminal fuse is connected with the negative electrode of the load or the charger and directly output to the load or the charger; and the total positive electrode of the lithium battery is connected with the positive electrode of a load or a charger.
Further, the model of the control chip is SH 367309.
Further, lithium cell secondary overvoltage prevents overcharge protection system includes: the circuit comprises a switch leakage resistor, a first control resistor, a second control resistor, a third control resistor, a fourth control resistor, a fifth control resistor, a sixth control resistor, a first control MOS (metal oxide semiconductor), a second control MOS, a third control MOS, a first switch tube, a second switch tube, a current storage diode and a three-terminal fuse, wherein the switch leakage resistor is connected with the switch leakage resistor; the three-terminal fuse, the first switch tube and the second switch tube are connected with the lithium battery total negative electrode in series, the third control MOS tube is connected with the second control MOS tube in series, the first control MOS tube is connected with the lithium battery total positive electrode, the three-terminal fuse overflows 1 pin and 2 pins at two ends and is connected with the first switch tube and the second switch tube in series, and the 4 pins and the 5 pins are connected with an external load and a charger. The 3 pins of the three-terminal fuse are connected with the 5 pins, the 6 pins, the 7 pins and the 8 pins of the first control MOS tube through a current storage diode, and the current storage diode is used for inhibiting reverse voltage of the three-terminal fuse;
the leakage resistance, the fifth control resistor and the sixth control resistor form a voltage reduction control circuit which is used for driving the second control MOS tube to be opened and closed;
the third control resistor and the fourth control resistor form a driving circuit for driving the second control MOS tube to be opened and closed;
the first control resistor and the second control resistor form a total voltage drop circuit for driving the first control MOS tube to be switched on and switched off.
Furthermore, one end of the open drain resistor is connected to the lithium battery signal B + master, the other end of the open drain resistor is connected to one end of a fifth control resistor, and the other end of the fifth control resistor is respectively connected with one end of a sixth control resistor and the grid electrode of a third control MOS transistor; the other end of the sixth control resistor is grounded, the source electrode of the third control MOS tube is grounded, and the drain electrode of the third control MOS tube is connected to the grid electrode of the second control MOS tube.
Furthermore, one end of the third control resistor is connected to the external power supply and power supply pull-up signal B + of the lithium battery, and the other end of the third control resistor is connected to the grid electrode of the second control MOS tube. One end of the fourth control resistor is connected to the grid of the second control MOS tube, and the other end of the fourth control resistor is grounded.
Furthermore, one end of the first control resistor is connected to the pin 3 of the first control MOS transistor, the other end of the first control resistor is connected to one end of the second control resistor and the pin 4 of the first control MOS transistor, and the other end of the second control resistor is connected to the drain of the second control MOS transistor.
Further, the first control MOS transistor Q1 is a PMOS transistor.
The control method of the lithium battery secondary overvoltage overcharge-prevention protection system comprises the following steps:
when the switch tube is not failed, the three-terminal fuse is not triggered, and the system works normally; when the switching tube fails, the control chip monitors that the voltage of the lithium battery rises to reach a limit set threshold value, and sends a control signal to control the three-terminal fuse to be fused so as to cut off the main negative circuit to disconnect charging.
Compared with the prior art, the invention has the following advantages and beneficial effects:
when the switching tube is not failed or normally works, the control chip is in monitoring failure or the voltage of the lithium battery jumps, the three-terminal fuse cannot be triggered, the normal work of the system is ensured, when the switching tube fails but the control chip monitors that the voltage of the lithium battery still rises, when the voltage of the battery reaches a limit set threshold value, the control chip sends a driving signal to control the three-terminal fuse to be fused so as to cut off the main negative circuit to disconnect the charging, and therefore the effect of preventing the overcharge by secondary overvoltage is achieved. Because the three-terminal fuse carries out bolted connection through paster nut and switch tube, can directly dismantle through the bolt and change easy maintenance.
Drawings
Fig. 1 is a schematic block diagram of a secondary overvoltage overcharge protection system for a lithium battery provided by the invention.
Fig. 2 is a schematic diagram of a part of a circuit in the lithium battery secondary overvoltage overcharge protection system provided by the invention.
Detailed Description
The technical solutions provided by the present invention will be described in detail below with reference to specific examples, and it should be understood that the following specific embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention.
The overall block diagram of the secondary overvoltage overcharge-prevention protection system of the lithium battery is shown in fig. 1, and the secondary overvoltage overcharge-prevention protection system comprises a 309 control chip, a switching tube and a three-terminal fuse, wherein the control chip receives a voltage signal of the lithium battery, outputs a driving signal to the switching tube and outputs a control signal to the three-terminal fuse. The switch tube is connected with the lithium battery negative pole, and the switch tube carries out bolted connection through paster nut and three-terminal fuse, and the three-terminal fuse overflows the both ends and installs in the centre of switch tube and load or charger, and is specific, and the three-terminal fuse is connected with the negative pole of load or charger, directly exports for load or charger. And the total positive electrode of the lithium battery is connected with the positive electrode of the load or the charger and can be directly output to the load or the charger. The control chip adopts an SH367309 control chip.
The invention also provides a feasible circuit as shown in fig. 2, wherein a control chip is composed of a leakage resistor R6, a first control resistor R1, a second control resistor R2, a third control resistor R3, a fourth control resistor R4, a fifth control resistor R5 and a sixth control resistor R7. The three-terminal FUSE comprises a first control MOS tube Q1, a second control MOS tube Q2 and a third control MOS tube Q3, a first switch tube Q4, a second switch tube Q6, a current storage diode D1 and a three-terminal FUSE F1, and the first switch tube Q4 and the second switch tube Q6 form a switch tube in the figure 1 and are connected with the total negative electrode of the lithium battery in series. The third control MOS tube Q3 and the second control MOS tube Q2 are connected in series, the first control MOS tube Q1 is connected with the total anode of the lithium battery, the three-terminal fuse F1 overcurrent two ends, pin 1 and pin 2, are connected with the first switch tube Q4 and the second switch tube Q6 in series, and pin 4 and pin 5 are connected with an external load and a charger. The 3 feet of the three-terminal fuse are connected with the 5 feet, the 6 feet, the 7 feet and the 8 feet of the first control MOS tube Q1 through a current storage diode D1. The current storage diode D1 is used to suppress the reverse voltage of the three terminal fuse F1.
The open-drain resistor R6, the fifth control resistor R5 and the sixth control resistor R7 form a 12V step-down control circuit for driving the Q2MOS transistor to open and close. Specifically, one end of the open-drain resistor R6 is connected to the lithium battery voltage signal B + master, the other end is connected to one end of the fifth control resistor R5, and the other end of the fifth control resistor R5 is connected to one end of the sixth control resistor R7 and the gate of the third control MOS transistor Q3, respectively. The other end of the sixth control resistor R7 is grounded, the source of the third control MOS transistor Q3 is grounded, and the drain is connected to the gate of the second control MOS transistor Q2.
The third control resistor R3 and the fourth control resistor R4 form an 8V driving circuit for driving the Q2MOS tube to be switched on and off. One end of the third control resistor R3 is connected to the external power supply and power supply pull-up signal B + of the lithium battery, and the other end is connected to the grid of the second control MOS tube Q2. One end of the fourth control resistor R4 is connected to the gate of the second control MOS transistor Q2, and the other end is grounded. The gate of the second control MOS transistor Q2 is further connected to pin 1, the source is connected to pin 2, and the drain is connected to pin 3. When pin 1 of the MOS transistor Q2 has a signal, pin 2 and pin 3 of the MOS transistor Q2 are communicated.
The first control resistor R1 and the second control resistor R2 form a total voltage drop circuit for driving the first control MOS transistor Q1 to be turned on and off. The first control resistor R1 is connected in parallel with the capacitor C1, and one end of R1 is connected to pin 3 of the first control MOS transistor Q1, and the other end is connected to one end of the second control resistor R2 and pin 4 of the first control MOS transistor Q1. The other end of the second control resistor R2 is connected to the drain of pin 3 of the second control MOS transistor Q2, and the first control MOS transistor Q1 is a PMOS transistor, in this example, a packaged chip HY06p10s is used.
When the switch tube is not damaged or fails, the three-terminal fuse cannot be triggered by mistake easily after voltage jump or system fault change of the lithium battery occurs. And simultaneously the switch tube is invalid or damaged, when the lithium battery is still charged when the switch tube is invalid, the control chip monitors that the voltage of the lithium battery is still rising, and when the voltage of the battery reaches a limit set threshold value, the SH367309 control chip sends a driving signal to control the three-terminal fuse to be fused so as to cut off the main negative circuit to cut off the charging, thereby achieving the effect of preventing the overcharge by secondary overvoltage. After the three-terminal fuse is damaged, the three-terminal fuse can be directly disassembled and replaced through the bolt.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.
Claims (8)
1. Lithium cell secondary overvoltage prevents overcharge protection system, its characterized in that includes: the control chip is used for receiving a voltage signal of the lithium battery, outputting a driving signal to the switching tube and outputting a control signal to the three-terminal fuse; the switching tube is further connected with the negative electrode of the lithium battery, the switching tube is in bolted connection with the three-terminal fuse through the patch nut, so that the switching tube is connected with the three-terminal fuse in series, and the three-terminal fuse is connected with the negative electrode of the load or the charger and directly output to the load or the charger; and the total positive electrode of the lithium battery is connected with the positive electrode of a load or a charger.
2. The lithium battery secondary overvoltage overcharge protection system of claim 1, wherein: the model of the control chip is SH 367309.
3. The lithium battery secondary overvoltage overcharge protection system of claim 1, wherein: lithium cell secondary overvoltage prevents overcharge protection system includes: the circuit comprises a switch leakage resistor, a first control resistor, a second control resistor, a third control resistor, a fourth control resistor, a fifth control resistor, a sixth control resistor, a first control MOS (metal oxide semiconductor), a second control MOS, a third control MOS, a first switch tube, a second switch tube, a current storage diode and a three-terminal fuse, wherein the switch leakage resistor is connected with the switch leakage resistor; the three-terminal fuse, the first switch tube and the second switch tube are connected with the lithium battery total negative electrode in series, the third control MOS tube is connected with the second control MOS tube in series, the first control MOS tube is connected with the lithium battery total positive electrode, the three-terminal fuse overcurrent two ends are connected with the first switch tube and the second switch tube in series through pins 1 and 2, and the pins 4 and 5 are connected with an external load and a charger; the 3 pins of the three-terminal fuse are connected with the 5 pins, the 6 pins, the 7 pins and the 8 pins of the first control MOS tube through a current storage diode, and the current storage diode is used for inhibiting reverse voltage of the three-terminal fuse;
the leakage resistance, the fifth control resistor and the sixth control resistor form a voltage reduction control circuit which is used for driving the second control MOS tube to be opened and closed;
the third control resistor and the fourth control resistor form a driving circuit for driving the second control MOS tube to be opened and closed;
the first control resistor and the second control resistor form a total voltage drop circuit for driving the first control MOS tube to be switched on and switched off.
4. The lithium battery secondary overvoltage overcharge protection system of claim 1, wherein: one end of the open drain resistor is connected to the lithium battery signal B + master, the other end of the open drain resistor is connected to one end of a fifth control resistor, and the other end of the fifth control resistor is respectively connected with one end of a sixth control resistor and the grid electrode of a third control MOS transistor; the other end of the sixth control resistor is grounded, the source electrode of the third control MOS tube is grounded, and the drain electrode of the third control MOS tube is connected to the grid electrode of the second control MOS tube.
5. The lithium battery secondary overvoltage overcharge protection system of claim 1, wherein: one end of the third control resistor is connected to the external power supply and power supply pull-up signal B + of the lithium battery, the other end of the third control resistor is connected to the grid electrode of the second control MOS tube, one end of the fourth control resistor is connected to the grid electrode of the second control MOS tube, and the other end of the fourth control resistor is grounded.
6. The lithium battery secondary overvoltage overcharge protection system of claim 1, wherein: one end of the first control resistor is connected to a pin 3 of the first control MOS tube, the other end of the first control resistor is connected to one end of the second control resistor and a pin 4 of the first control MOS tube, and the other end of the second control resistor is connected with a drain electrode of the second control MOS tube.
7. The lithium battery secondary overvoltage overcharge protection system of claim 1, wherein: the first control MOS tube Q1 adopts a PMOS tube.
8. A control method of a lithium battery secondary overvoltage anti-overcharge protection system is realized based on the lithium battery secondary overvoltage anti-overcharge protection system of any one of claims 1 to 7, and comprises the following steps:
when the switch tube is not failed, the three-terminal fuse is not triggered, and the system works normally; when the switching tube fails, the control chip monitors that the voltage of the lithium battery rises to reach a limit set threshold value, and sends a control signal to control the three-terminal fuse to be fused so as to cut off the main negative circuit to disconnect charging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011137482.7A CN112165076A (en) | 2020-10-22 | 2020-10-22 | Lithium battery secondary overvoltage overcharge-prevention protection system and control method |
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| CN202011137482.7A CN112165076A (en) | 2020-10-22 | 2020-10-22 | Lithium battery secondary overvoltage overcharge-prevention protection system and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300333A (en) * | 2021-06-28 | 2021-08-24 | 吉林省睿强新能源科技有限公司 | Lithium battery secondary overvoltage overcharge-prevention protection system and control method thereof |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300333A (en) * | 2021-06-28 | 2021-08-24 | 吉林省睿强新能源科技有限公司 | Lithium battery secondary overvoltage overcharge-prevention protection system and control method thereof |
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