CN217010378U - Multi-functional lithium electricity protection circuit with multistage protection - Google Patents
Multi-functional lithium electricity protection circuit with multistage protection Download PDFInfo
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- CN217010378U CN217010378U CN202123213801.0U CN202123213801U CN217010378U CN 217010378 U CN217010378 U CN 217010378U CN 202123213801 U CN202123213801 U CN 202123213801U CN 217010378 U CN217010378 U CN 217010378U
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Abstract
The utility model relates to a multi-functional lithium battery protection circuit with multi-stage protection, which comprises a charging connection terminal, a first-stage battery protection chip and a second-stage battery protection chip, wherein the first-stage battery protection chip is connected with a battery anode and used for detecting the voltage of a battery, the second-stage battery protection chip is connected with the battery anode and used for detecting the voltage of the battery, the charging connection terminal is connected with the anode of the battery through a first charging MOS (metal oxide semiconductor) tube, the anode of the charging connection terminal is connected with a source electrode of the first charging MOS tube, the battery anode is connected with a drain electrode of the first charging MOS tube, an output pin of the first-stage battery protection chip is connected with a grid electrode of the first charging MOS tube, an output pin of the second-stage battery protection chip is also connected with the grid electrode of the first charging MOS tube, and the battery supplies power to the first-stage battery protection chip and the second-stage battery protection chip.
Description
Technical Field
The utility model relates to a multi-functional lithium battery protection circuit with multi-stage protection.
Background
The battery charging and discharging protection is usually performed by a main control chip of the electric tool, but when the main control chip fails, the management and protection capabilities of the battery are lost, so how to effectively protect the battery when the main control chip fails is a technical problem to be solved at present.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the multifunctional lithium battery protection circuit with the multi-stage protection function can protect the overcharge and the overdischarge of the battery when a main control chip fails, and the service life of the battery is prolonged.
In order to solve the technical problems, the utility model adopts the technical scheme that: multi-functional lithium electricity protection circuit with multistage protection, including charging connection terminal, first order battery protection chip and second level battery protection chip, first order battery protection chip connects the battery anodal, detects battery voltage, and second level battery protection chip connects the battery anodal, detects battery voltage, and charging connection terminal is connected with the anodal of battery through first charging MOS pipe, and charging connection terminal's positive pole connects the source electrode of first charging MOS pipe, and the battery anodal drain electrode that connects first charging MOS pipe, an output pin of first order battery protection chip is connected with the grid of first charging MOS pipe, and an output pin of second battery protection chip also is connected with the grid of first charging MOS pipe, and the battery is for first order battery protection chip and second level battery protection chip power supply.
As a preferred scheme, a boosting module is connected in series between the charging connection terminal and the first charging MOS tube, the first charging MOS tube is a high-power MOS tube, the gate of the first charging MOS tube is connected to the drain of the second charging MOS tube, the output pin of the first-stage battery protection chip and the output pin of the second-stage battery protection chip are connected in parallel to the gate of the second charging MOS tube, and the source of the second charging MOS tube is grounded.
As a preferred scheme, the positive pole of the battery is connected with a positive pole output terminal, a discharging MOS tube is connected in series between the positive pole output terminal and the positive pole of the battery, the source electrode of the discharging MOS tube is connected with the positive pole of the power supply, the drain electrode of the discharging MOS tube is connected with the positive pole output terminal, the grid electrode of the discharging MOS tube is connected with one output pin of a main control chip, and the main control chip respectively detects the voltage and the temperature of the battery through a sampling resistor and a thermistor; the battery supplies power to the main control chip, and the other output pin of the main control chip is connected with the grid electrode of the second charging MOS tube.
As a preferred scheme, the second-stage battery protection chip is connected with the boost module, and the second-stage battery protection chip can control the start and stop of the boost module.
As a preferable scheme, a common diode is connected in series between the drain electrode of the first charging MOS transistor and the positive electrode of the battery, the positive electrode of the diode is connected with the drain electrode of the first charging MOS transistor, and the negative electrode of the diode is connected with the positive electrode of the battery.
The utility model has the beneficial effects that: according to the utility model, the first-stage battery protection chip and the second-stage battery protection chip are connected in parallel with the positive electrode of the battery, and both the first-stage battery protection chip and the second-stage battery protection chip can be controlled.
Drawings
Embodiments of the utility model will be described in further detail below with reference to the accompanying drawings, in which:
fig. 1 is a circuit diagram of a lithium battery protection circuit according to the present invention.
Detailed Description
Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the multifunctional lithium battery protection circuit with multi-stage protection comprises a charging connection terminal TYPE-C, a first-stage battery protection chip U1 and a second-stage battery protection chip U2, wherein an input pin VC1 of the first-stage battery protection chip U1 is connected with a battery anode, the battery voltage is detected, an input pin VC2 of the second-stage battery protection chip U2 is also connected with the battery anode, the battery voltage is detected, the charging connection terminal TYPE-C is connected with the anode of the battery through a first charging MOS transistor Q1, the anode of the charging connection terminal TYPE-C is connected with the source of the first charging MOS transistor Q1, the battery anode is connected with the drain of the first charging MOS transistor Q1, one output pin CO1 of the first-stage battery protection chip U1 is connected with the gate of the first charging MOS transistor Q1, one output pin CO2 of the second battery protection chip U2 is also connected with the gate of the first charging MOS transistor Q1, the battery supplies power to the first-stage battery protection chip U1 and the second-stage battery protection chip U2. The first charging MOS transistor Q1 in this embodiment is a P-type MOS transistor.
In order to improve the accuracy of detecting the battery voltage by the first-stage battery protection chip U1 and the second-stage battery protection chip U2, two filter resistors R1 are preferably connected in series between the input pin VC1 of the first-stage battery protection chip U1 and the positive electrode of the battery; two filter resistors R1 are also connected in series between the input pin VC2 of the second-stage battery protection chip U2 and the anode of the battery.
In this embodiment, a boosting module U3 is connected in series between the charging connection terminal TYPE-C and the first charging MOS transistor Q1, the first charging MOS transistor Q1 is a high-power MOS transistor, the gate of the first charging MOS transistor Q1 is connected to the drain of the second charging MOS transistor Q2, the output pin CO1 of the first-stage battery protection chip U1 and the output pin CO2 of the second-stage battery protection chip U2 are connected in parallel to the gate of the second charging MOS transistor Q2, and the source of the second charging MOS transistor Q2 is grounded. The second charging MOS transistor Q2 used herein is an N-type MOS transistor.
After having inserted boost module U3, the lithium electricity protection circuit of this embodiment can convert the 5V voltage of TYPE-C input into the high voltage that is fit for battery charging, for example 12V, 12.6V etc. can be applied to the charging to electric tool battery package like this.
In this embodiment, an output pin CO5 of the second-stage battery protection chip U2 is connected to an output pin P of the boost module U3 through a protection MOS transistor Q4, an output pin CO5 of the second-stage battery protection chip U2 is connected to a gate of the protection MOS transistor 4, an output pin P of the boost module U3 is connected to a source of the protection MOS transistor Q4, a drain of the protection MOS transistor Q4 is grounded, when the second-stage battery protection chip U2 detects that the battery voltage exceeds a preset value, the protection MOS transistor Q4 is controlled to be turned on through the output pin CO5, so that a level of the output pin P of the boost module U3 is lowered, when the level of the output pin P of the boost module U3 is lowered, the boost module U3 stops operating, when the battery temperature falls to a reasonable interval, the second-stage battery protection chip U2 controls the protection MOS transistor Q4 to be turned off, and the boost module U3 resumes operating.
The positive pole of the battery is connected with a positive pole output terminal V +, a negative pole terminal V-is matched with the positive pole output terminal V +, and the negative pole terminal V-is directly grounded. A P-type discharge MOS tube Q3 is connected in series between the positive output terminal V + and the battery positive electrode B +, the source electrode of the discharge MOS tube Q3 is connected with the battery positive electrode B +, the drain electrode is connected with the positive output terminal V +, and the grid electrode is connected with an output pin CO3 of the main control chip MCU, and the main control chip MCU respectively detects the voltage and the temperature of the battery through a sampling resistor RV and a thermistor NTC; the battery supplies power for main control chip MCU, the anodal B + of battery is connected through divider resistance R2 to the positive pole of sampling resistance RV, the negative pole ground connection of sampling resistance RV, on the anodal input pin VC3 that still is connected to main control chip MCU of sampling resistance RV, thermistor NTC's positive pole detects voltage through a divider resistance R3 and 5V and is connected, thermistor NTC's negative pole ground connection, thermistor NTC's positive pole is connected to on main control chip MCU's the input pin VC 4. The other output pin CO4 of the main control chip MCU is connected to the gate of the second charging MOS transistor Q2.
In this embodiment, a common diode D1 is connected in series between the drain of the first charging MOS transistor Q1 and the battery anode B +, the anode of the diode D1 is connected to the drain Q1 of the first charging MOS transistor, and the cathode of the diode is connected to the battery anode B +. This prevents damage to the boost module U3 from the battery voltage during the non-charging state.
The working process of the utility model is as follows: as shown in fig. 1, before the lithium battery protection circuit is used, a first protection voltage is preset for the first-stage battery protection chip U1, a second protection voltage is preset for the second-stage battery protection chip U2, and a third protection voltage, a low-voltage protection voltage and a high-temperature protection temperature are preset for the ground master chip MCU.
After the battery is connected, the battery supplies power to a first-level battery protection chip U1, a second-level battery protection chip U2 and a main control chip MCU, the first-level battery protection chip U1, the second-level battery protection chip U2 and the main control chip MCU detect the battery voltage respectively, when the battery voltage is lower than the first protection voltage, the first-level battery protection chip U1, the second-level battery protection chip U2 and the main control chip MCU all control the conduction of a second charging MOS tube Q2, and then the conduction of a first charging MOS tube Q1.
When the battery charges, TYPE-C connects the charger, when first MOS pipe Q1 switches on, the battery can charge smoothly, first order battery protection chip U1 in the charging process, second level battery protection chip U2 and main control chip MCU continue respectively to detect battery voltage, when the battery charges after the voltage exceedes first protection voltage, first order battery protection chip U1 will control second MOS pipe Q2 disconnection that charges, and then disconnect first MOS pipe Q1 that charges, charging circuit disconnection, the battery obtains charge protection.
When the first-stage battery protection chip U1 has a fault, when the battery voltage exceeds the first protection voltage, the first charging MOS tube Q1 cannot be disconnected, the battery is still charged, the battery voltage continues to rise, when the battery voltage exceeds the second protection voltage, the second-stage battery protection chip U2 controls the second charging MOS tube Q2 to be disconnected, the first charging MOS tube Q1 is further disconnected, the charging circuit is disconnected, and the battery is protected in a charging mode.
When the boost module U3 is connected to the charging circuit, the second-stage battery protection chip U2 can also turn on the protection MOS transistor Q4 to stop the operation of the boost module U3, thereby protecting the battery from being overcharged. Therefore, the problem that the first-stage battery protection chip U1 and the second-stage battery protection chip U2 are failed and failed when the first charging MOS tube Q1 is in a short circuit can be avoided.
Similarly, when the second battery protection chip U2 breaks down, when the battery voltage exceeded the second protection voltage, the second MOS transistor Q that charges could not be disconnected, and the battery was still charging, and the battery voltage continued to rise, and when the battery voltage exceeded the third protection voltage, main control chip MCU would control the disconnection of second MOS transistor Q2 that charges, and then breaks off first MOS transistor Q1 that charges, and charging circuit disconnection, the battery obtains charge protection.
When the temperature in the battery charging process exceeds the high-temperature protection temperature, the main control chip MCU also can control the disconnection of the second charging MOS tube Q2 and the discharging MOS tube Q3, and further disconnect the first charging MOS tube Q1, the charging circuit and the discharging circuit are both disconnected, the battery is protected by over-temperature, when the temperature of the battery is reduced to a safety value, the main control chip MCU controls the conduction of the second charging MOS tube Q2 and the discharging MOS tube Q3, and further conducts the first charging MOS tube Q1, and the battery charging circuit or the discharging circuit is switched on.
Through tertiary protection, can effectual protection battery safety of charging.
The battery can be discharged by connecting a load to the positive output terminal V + and the output terminal V-, the battery voltage and the temperature are still monitored by the main control chip MCU in the discharging process of the battery, and when the battery voltage is lower than the low-voltage protection voltage, the main control chip MUC controls the discharging MOS tube Q3 to be disconnected, so that a battery discharging circuit is disconnected, and the battery is subjected to low-voltage protection.
The foregoing embodiments are merely illustrative of the principles and effects of the present invention, as well as some embodiments, and are not intended to limit the utility model; it should be noted that various changes and modifications can be made by those skilled in the art without departing from the inventive concept, and these changes and modifications fall within the scope of the utility model.
Claims (5)
1. The multifunctional lithium battery protection circuit with the multistage protection function is characterized by comprising a charging connection terminal, a first-level battery protection chip and a second-level battery protection chip, wherein the first-level battery protection chip is connected with a battery anode and detects battery voltage, the second-level battery protection chip is connected with the battery anode and detects the battery voltage, the charging connection terminal is connected with the anode of a battery through a first charging MOS (metal oxide semiconductor) tube, the anode of the charging connection terminal is connected with a source electrode of the first charging MOS tube, the battery anode is connected with a drain electrode of the first charging MOS tube, an output pin of the first-level battery protection chip is connected with a grid electrode of the first charging MOS tube, an output pin of the second-level battery protection chip is also connected with a grid electrode of the first charging MOS tube, and the battery supplies power for the first-level battery protection chip and the second-level battery protection chip.
2. The multifunctional lithium ion battery protection circuit with multistage protection according to claim 1, wherein a boost module is connected in series between the charging connection terminal and the first charging MOS transistor, the first charging MOS transistor is a high-power MOS transistor, a gate of the first charging MOS transistor is connected to a drain of the second charging MOS transistor, an output pin of the first stage battery protection chip and an output pin of the second stage battery protection chip are connected in parallel to a gate of the second charging MOS transistor, and a source of the second charging MOS transistor is grounded.
3. The multifunctional lithium ion battery protection circuit with multi-stage protection according to claim 2, wherein the positive electrode of the battery is connected with a positive electrode output terminal, a discharge MOS transistor is connected in series between the positive electrode output terminal and the positive electrode of the battery, the source electrode of the discharge MOS transistor is connected with the positive electrode of the power supply, the drain electrode of the discharge MOS transistor is connected with the positive electrode output terminal, the gate electrode of the discharge MOS transistor is connected with an output pin of the main control chip, and the main control chip detects the voltage and the temperature of the battery through a sampling resistor and a thermistor respectively; the battery supplies power to the main control chip, and the other output pin of the main control chip is connected with the grid electrode of the second charging MOS tube.
4. The multi-functional lithium ion battery protection circuit with multi-level protection of claim 2, wherein the second battery protection chip is connected to the boost module, and the second battery protection chip is configured to control the boost module to be turned on or off.
5. The multifunctional lithium ion battery protection circuit with the multilevel protection according to claim 1, wherein a common diode is connected in series between the drain electrode of the first charging MOS transistor and the positive electrode of the battery, the positive electrode of the diode is connected to the drain electrode of the first charging MOS transistor, and the negative electrode of the diode is connected to the positive electrode of the battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123213801.0U CN217010378U (en) | 2021-12-20 | 2021-12-20 | Multi-functional lithium electricity protection circuit with multistage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123213801.0U CN217010378U (en) | 2021-12-20 | 2021-12-20 | Multi-functional lithium electricity protection circuit with multistage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217010378U true CN217010378U (en) | 2022-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123213801.0U Active CN217010378U (en) | 2021-12-20 | 2021-12-20 | Multi-functional lithium electricity protection circuit with multistage protection |
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| Country | Link |
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| CN (1) | CN217010378U (en) |
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2021
- 2021-12-20 CN CN202123213801.0U patent/CN217010378U/en active Active
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