CN215733463U - Lithium battery protection circuit for impact screwdriver - Google Patents
Lithium battery protection circuit for impact screwdriver Download PDFInfo
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- CN215733463U CN215733463U CN202122382050.9U CN202122382050U CN215733463U CN 215733463 U CN215733463 U CN 215733463U CN 202122382050 U CN202122382050 U CN 202122382050U CN 215733463 U CN215733463 U CN 215733463U
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- lithium battery
- sampling circuit
- protection circuit
- transistor
- circuit
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 134
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 134
- 238000005070 sampling Methods 0.000 claims abstract description 109
- 238000007599 discharging Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 19
- 230000005669 field effect Effects 0.000 claims description 31
- 230000005611 electricity Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000005856 abnormality Effects 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003571 electronic cigarette Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The utility model relates to the technical field of lithium battery protection, and discloses a lithium battery protection circuit for an impact screwdriver, which comprises a lithium battery pack, a voltage sampling circuit, a current sampling circuit, a temperature sampling circuit and an MCU module; the voltage sampling circuit and the current sampling circuit are electrically connected with the lithium battery pack and are respectively used for sampling voltage and current in the charging and discharging process of the lithium battery pack, the voltage sampling circuit, the current sampling circuit and the temperature sampling circuit are electrically connected with the MCU module, the temperature sampling circuit is used for sampling the working temperature of the lithium battery, and the MCU module is electrically connected with the charging protection circuit and the discharging protection circuit. The device can sample voltage and current and temperature in the charge-discharge process of the lithium battery pack in real time, and can cut off a charge-discharge circuit in time when abnormality occurs, so that the influence on the battery is prevented.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a lithium battery protection circuit for an impact screwdriver.
Background
With the progress of science and technology, electronic products such as mobile phones, electronic cigarettes, mobile power sources, TWS (true wireless stereo) earphones, smart wristbands and watches, which use lithium batteries as power supply devices, have become popular.
The prior art lithium battery protection circuit generally has four protection functions of controlling normal use of the lithium battery and overcharge/overdischarge/overcurrent/short circuit of the lithium battery. Specifically, the prior art lithium battery protection circuit generally includes: the device comprises a sampling circuit, a logic control circuit, an overcharge protection circuit, an overdischarge protection circuit and a charge detection circuit. The lithium battery protection circuit cannot prevent the danger caused by overhigh temperature in the process of charging or using the lithium battery. Therefore, the lithium battery can be damaged at different operating temperatures, so that the service life of the lithium battery is influenced, and the lithium battery can be damaged in severe cases.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a lithium battery protection circuit for an impact screwdriver, which can sample the voltage, the current and the temperature of a lithium battery pack in the charging and discharging process in real time, and can cut off the charging and discharging circuit in time when an abnormality occurs so as to prevent the battery from being influenced.
In order to achieve the above purpose, the utility model provides the following technical scheme:
a lithium battery protection circuit for an impact screwdriver comprises a lithium battery pack, a voltage sampling circuit, a current sampling circuit, a temperature sampling circuit and an MCU module;
voltage sampling circuit, current sampling circuit all with lithium cell group electricity is connected, is used for respectively to the lithium cell group charge and discharge process's voltage, electric current sample, voltage sampling circuit, current sampling circuit, temperature sampling circuit all with MCU module electricity is connected, temperature sampling circuit is used for sampling the operating temperature of lithium cell, the MCU module with charge protection circuit, discharge protection circuit electricity are connected, the MCU module is used for receiving above-mentioned voltage, electric current and temperature sampling signal.
In the utility model, the lithium battery pack further comprises a charging protection circuit and a discharging protection circuit, one end of the charging protection circuit and one end of the discharging protection circuit are connected with the lithium battery pack and used for protecting the charging and discharging processes of the lithium battery, the other end of the charging protection circuit and the other end of the discharging protection circuit are both connected with the MCU module, and the MCU module is used for controlling the charging protection circuit and the discharging protection circuit to be switched on or off.
In the utility model, further, the lithium battery pack comprises a lithium battery BT1, a lithium battery BT2 and a lithium battery BT3, wherein the lithium battery BT1, the lithium battery BT2 and the lithium battery BT3 are sequentially connected in series.
In the present invention, the MCU module includes a main control chip U1, the temperature sampling circuit includes a resistor RT1, the resistor RT1 is grounded in parallel with a capacitor C9, and the resistor RT1 is connected to a P1.2 port of the main control chip U1, and is configured to transmit the acquired temperature signal to the main control chip U1.
In the present invention, the charging protection circuit further includes a MOS transistor Q14 and a MOS transistor Q15, a drain of the MOS transistor Q14 is connected to the lithium battery pack, a gate of the MOS transistor Q14 is connected to a resistor R27 and a resistor R28, the resistor R27 is connected to a triode Q12, the triode Q12 is connected to a field effect transistor Q11, and the field effect transistor Q11 is connected to the main control chip U1.
In the present invention, the discharge protection circuit further includes a MOS transistor Q9, a gate of the MOS transistor Q9 is connected to a triode Q8, the triode Q8 is connected to a triode Q7, and a base of the triode Q7 is connected to a P3.6 port of the main control chip U1.
In the present invention, the current sampling circuit further includes a field effect transistor Q6, the pins 4 and 5 of the field effect transistor Q6 are correspondingly connected to the pins 7 and 14 of the main control chip U1, respectively, and the pin 2 of the field effect transistor Q6 is connected to the MOS transistor Q15 through a resistor R29, a resistor R37, and a resistor R38.
In the present invention, further, the voltage sampling circuit includes a BT1 sampling circuit, a BT2 sampling circuit, and a BT3 sampling circuit, where input ends of the BT1 sampling circuit, the BT2 sampling circuit, and the BT3 sampling circuit are respectively connected to the lithium battery BT1, the lithium battery BT2, and the lithium battery BT3, and output ends of the BT1 sampling circuit, the BT2 sampling circuit, and the BT3 sampling circuit are respectively connected to the MCU module, and are respectively used for sampling voltages of the lithium battery BT1, the lithium battery BT2, and the lithium battery BT3 and transmitting the voltages to the MCU module.
In the present invention, the BT1 sampling circuit further includes a transistor Q1 and a transistor Q5, an emitter of the transistor Q1 is connected to the lithium battery BT1, a base of the transistor Q1 is connected to a base of the transistor Q5, and a collector of the transistor Q2 is connected to a P1.6 port of the main control chip U1 through a resistor R2.
The BT2 sampling circuit comprises a field effect transistor Q2, wherein 3 pins of the field effect transistor Q2 are connected with the lithium battery BT2, and 4 pins of the field effect transistor Q2 are connected with a P1.4 port of the main control chip U1;
the BT3 sampling circuit comprises a resistor R7, the resistor R7 is connected with the lithium battery BT3, the resistor R7 is connected with a field-effect tube Q11, and 4 pins of the field-effect tube Q11 are connected with a P1.5 port of the main control chip U1.
Compared with the prior art, the utility model has the beneficial effects that:
according to the technical scheme provided by the utility model, the voltage sampling circuit is used for detecting the voltage of the lithium battery pack in the charging and discharging process, the current sampling circuit is used for detecting the current in the charging and discharging process, the temperature sampling circuit is used for detecting the working temperature of the lithium battery pack, and when the MCU module detects that the voltage exceeds the preset value and the danger exists, the charging protection circuit or the discharging protection circuit can be controlled to be disconnected with the lithium battery pack, so that the working stability and the safety and reliability of the lithium battery pack are ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:
FIG. 1 is an overall structural view of a lithium battery protection circuit for impact screwdriver according to the present invention;
FIG. 2 is a circuit diagram of a lithium battery protection circuit for impact screwdriver according to the present invention;
in the figure: 1. a voltage sampling circuit; 2. a current sampling circuit; 3. an MCU module; 4. a temperature sampling circuit; 5. a charging protection circuit; 6. a discharge protection circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 2, a preferred embodiment of the present invention provides a lithium battery protection circuit for impact screwdriver, including a lithium battery pack, a voltage sampling circuit 1, a current sampling circuit 2, a temperature sampling circuit 4, and an MCU module 3;
voltage sampling circuit 1, current sampling circuit 2 all with lithium cell group electricity is connected, is used for respectively to lithium cell group charging and discharging process's voltage, electric current sample, voltage sampling circuit 1, current sampling circuit 2, temperature sampling circuit 4 all with MCU module 3 electricity is connected, temperature sampling circuit 4 is used for sampling the operating temperature of lithium cell, MCU module 3 with charging protection circuit 5, discharge protection circuit 6 electricity are connected, MCU module 3 is used for receiving above-mentioned voltage, electric current and temperature sampling signal.
Specifically, in this scheme, detect the voltage of lithium cell group charge-discharge process through voltage sampling circuit 1, detect the electric current of charge-discharge process through current sampling circuit 2, detect the operating temperature of lithium cell group through temperature sampling circuit 4, when MCU module 3 detects above-mentioned to exceeding and predetermineeing when having danger, through the charge-discharge process of steerable cutting off lithium cell group, guarantee the stability and the fail safe nature of lithium cell group work.
In the utility model, the lithium battery pack further comprises a charge protection circuit 5 and a discharge protection circuit 6, one end of the charge protection circuit 5 and one end of the discharge protection circuit 6 are connected with the lithium battery pack and used for protecting the charge and discharge process of the lithium battery, the other end of the charge protection circuit 5 and the other end of the discharge protection circuit 6 are both connected with the MCU module 3, and the MCU module 3 controls the charge protection circuit 5 or the discharge protection circuit 6 to be switched on or off. When one or more of the voltage signal, the current signal or the temperature signal is detected to be abnormal, the MCU module 3 controls the charging and discharging loop of the lithium battery pack to be switched off by controlling the charging protection circuit 5 or the discharging protection circuit 6, so that the safety of the lithium battery is ensured.
In the utility model, further, the lithium battery pack comprises a lithium battery BT1, a lithium battery BT2 and a lithium battery BT3, wherein the lithium battery BT1, the lithium battery BT2 and the lithium battery BT3 are sequentially connected in series. The scheme is suitable for series connection of multiple lithium batteries, the protection board scheme is designed for 12V impact screwdriver protection boards, and the protection board scheme is suitable for lithium batteries with different chemical properties, such as lithium ions, ternary lithium and the like.
In the utility model, further, the MCU module 3 includes a main control chip U1, the main control chip U1 is SC92F7321, the chip has low cost and wide application range, and the requirement of the present solution is met. The MCU module 3 is the control core of this scheme, can carry out the abnormal judgement to the charging and discharging in-process according to the voltage, electric current and the temperature sampling signal of lithium cell group feedback, when the detected signal surpassed the default, will in time send control signal to cut off the return circuit, protect the safety of lithium cell group.
Specifically, in this embodiment, the temperature sampling circuit 4 includes a resistor RT1, the resistor RT1 is connected to a VDD power supply through a resistor R24, the resistor RT1 is connected to a capacitor C9 in parallel and grounded, the resistor RT1 is connected to a P1.2 port of the main control chip U1, and the resistor RT1 is configured to transmit the acquired temperature signal around the lithium battery pack to the main control chip U1.
In the present invention, the voltage sampling circuit 1 further includes a BT1 sampling circuit, a BT2 sampling circuit and a BT3 sampling circuit, input ends of the BT1 sampling circuit, the BT2 sampling circuit and the BT3 sampling circuit are respectively connected to the lithium battery BT1, the lithium battery BT2 and the lithium battery BT3, output ends of the BT1 sampling circuit, the BT2 sampling circuit and the BT3 sampling circuit are respectively connected to the MCU module 3, and the BT1 sampling circuit, the BT2 sampling circuit and the BT3 sampling circuit are respectively used for sampling voltages of the lithium battery BT1, the lithium battery BT2 and the lithium battery BT3 and transmitting the voltages to the MCU module 3.
In the present invention, the BT1 sampling circuit further includes a transistor Q1 and a transistor Q5, an emitter of the transistor Q1 is connected to the lithium battery BT1, a base of the transistor Q1 is connected to a base of the transistor Q5, and a collector of the transistor Q2 is connected to a P1.6 port of the main control chip U1 through a resistor R2.
The BT2 sampling circuit comprises a field effect transistor Q2, wherein 3 pins of the field effect transistor Q2 are connected with the lithium battery BT2, and 4 pins of the field effect transistor Q2 are connected with a P1.4 port of the main control chip U1;
the BT3 sampling circuit comprises a resistor R7, the resistor R7 is connected with the lithium battery BT3, the resistor R7 is connected with a field-effect tube Q11, and 4 pins of the field-effect tube Q11 are connected with a P1.5 port of the main control chip U1.
Therefore, the voltage of the lithium battery BT1, the voltage of the lithium battery BT2 and the voltage of the lithium battery BT3 are sampled respectively, the MCU module 3 can monitor the charging and discharging voltage of each lithium battery in real time, and when one or more of the lithium batteries are subjected to overvoltage, a charging or discharging loop can be cut off in time.
In the present invention, the current sampling circuit 2 further includes a field effect transistor Q6, the pins 4 and 5 of the field effect transistor Q6 are respectively connected to the pins 7 and 14 of the main control chip U1, and the pin 2 of the field effect transistor Q6 is connected to the MOS transistor Q15 through a resistor R29, a resistor R37, and a resistor R38. Specifically, a pin 3 of the field-effect transistor Q6 is connected with the lithium battery pack through a resistor R20, and is used for detecting the current in the charging and discharging process and feeding back a current signal to the MCU module 3.
In the present invention, the charging protection circuit 5 further includes a MOS transistor Q14 and a MOS transistor Q15, a drain of the MOS transistor Q14 is connected to the lithium battery pack, a gate of the MOS transistor Q14 is connected to a resistor R27 and a resistor R28, the resistor R27 is connected to a triode Q12, the triode Q12 is connected to a field effect transistor Q11, and the field effect transistor Q11 is connected to the main control chip U1. Specifically, in this embodiment, the main control chip U1 controls the MOS transistor Q14 and the MOS transistor Q15 to turn on or off the charging circuit by controlling the cooperation of the fet Q11, the fet Q11, and the transistor Q12.
In the present invention, the discharge protection circuit 6 further includes an MOS transistor Q9, a gate of the MOS transistor Q9 is connected to a triode Q8, the triode Q8 is connected to a triode Q7, and a base of the triode Q7 is connected to a P3.6 port of the main control chip U1. Specifically, during discharging, the main control chip U1 controls the transistor Q7 to be turned on or off, and the transistor Q8 and the MOS transistor Q9 are matched to turn on or off the discharging loop.
In the present embodiment, it is preferred that,
the working principle is as follows:
according to the technical scheme provided by the utility model, the voltage sampling circuit 1 is used for detecting the voltage of the lithium battery pack in the charging and discharging process, the current sampling circuit 2 is used for detecting the current in the charging and discharging process, the temperature sampling circuit 4 is used for detecting the working temperature of the lithium battery pack, and when the MCU module 3 detects that the voltage exceeds the preset value and the working temperature is dangerous, the charging protection circuit 5 or the discharging protection circuit 6 can be controlled to be disconnected with the lithium battery pack, so that the working stability and the safety reliability of the lithium battery pack are ensured.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (10)
1. A lithium battery protection circuit for an impact screwdriver is characterized by comprising a lithium battery pack, a voltage sampling circuit, a current sampling circuit, a temperature sampling circuit and an MCU module;
voltage sampling circuit, current sampling circuit all with lithium cell group electricity is connected, is used for respectively to the lithium cell group charge and discharge process's voltage, electric current sample, voltage sampling circuit, current sampling circuit, temperature sampling circuit all with MCU module electricity is connected, temperature sampling circuit is used for sampling the operating temperature of lithium cell, the MCU module with charge protection circuit, discharge protection circuit electricity are connected, the MCU module is used for receiving above-mentioned voltage, electric current and temperature sampling signal.
2. The lithium battery protection circuit for impact screwdriver according to claim 1, further comprising a charge protection circuit and a discharge protection circuit, wherein one end of the charge protection circuit and one end of the discharge protection circuit are connected to the lithium battery pack for protecting the charging and discharging processes of the lithium battery, and the other end of the charge protection circuit and the other end of the discharge protection circuit are connected to the MCU module, and the MCU module is used for controlling the charge protection circuit and the discharge protection circuit to be turned on or off.
3. The lithium battery protection circuit for the impact screwdriver as recited in claim 2, wherein the lithium battery pack comprises a lithium battery BT1, a lithium battery BT2 and a lithium battery BT3, and the lithium battery BT1, the lithium battery BT2 and the lithium battery BT3 are sequentially connected in series.
4. The lithium battery protection circuit for the impact screwdriver as recited in claim 3, wherein the MCU module comprises a main control chip U1, the temperature sampling circuit comprises a resistor RT1, the resistor RT1 is grounded in parallel with a capacitor C9, and the resistor RT1 is connected with a P1.2 port of the main control chip U1 and used for transmitting the collected temperature signal to the main control chip U1.
5. The lithium battery protection circuit for the impact screwdriver as recited in claim 4, wherein the charging protection circuit comprises a MOS transistor Q14 and a MOS transistor Q15, the drain of the MOS transistor Q14 is connected with the lithium battery pack, the gate of the MOS transistor Q14 is connected with a resistor R27 and a resistor R28, the resistor R27 is connected with a triode Q12, the triode Q12 is connected with a field effect transistor Q11, and the field effect transistor Q11 is connected with the main control chip U1.
6. The lithium battery protection circuit for the impact screwdriver as recited in claim 4, wherein the discharge protection circuit comprises a MOS transistor Q9, a transistor Q8 is connected to the gate of the MOS transistor Q9, a transistor Q7 is connected to the transistor Q8, and the base of the transistor Q7 is connected to the P3.6 port of the main control chip U1.
7. The lithium battery protection circuit for impact screwdriver as recited in claim 5, wherein the current sampling circuit comprises a field effect transistor Q6, pins 4 and 5 of the field effect transistor Q6 are respectively connected with pins 7 and 14 of the main control chip U1, and pin 2 of the field effect transistor Q6 is connected with the MOS transistor Q15 through a resistor R29, a resistor R37 and a resistor R38.
8. The lithium battery protection circuit for the impact screwdriver as recited in claim 4, wherein the voltage sampling circuit comprises a BT1 sampling circuit, a BT2 sampling circuit and a BT3 sampling circuit, input ends of the BT1 sampling circuit, the BT2 sampling circuit and the BT3 sampling circuit are respectively connected with a lithium battery BT1, a lithium battery BT2 and a lithium battery BT3, and output ends of the BT1 sampling circuit, the BT2 sampling circuit and the BT3 sampling circuit are respectively connected with the MCU module and are respectively used for sampling voltages of a lithium battery BT1, a lithium battery BT2 and a lithium battery BT3 and transmitting the voltages to the MCU module.
9. The lithium battery protection circuit for the impact screwdriver as recited in claim 8, wherein the BT1 sampling circuit comprises a transistor Q1 and a transistor Q5, an emitter of the transistor Q1 is connected to the lithium battery BT1, a base of the transistor Q1 is connected to a base of a transistor Q5, and a collector of the transistor Q2 is connected to the P1.6 port of the main control chip U1 through a resistor R2.
10. The lithium battery protection circuit for the impact screwdriver as recited in claim 9, wherein the BT2 sampling circuit comprises a field effect transistor Q2, pin 3 of the field effect transistor Q2 is connected to the lithium battery BT2, pin 4 of the field effect transistor Q2 is connected to port P1.4 of the main control chip U1;
the BT3 sampling circuit comprises a resistor R7, the resistor R7 is connected with the lithium battery BT3, the resistor R7 is connected with a field-effect tube Q11, and 4 pins of the field-effect tube Q11 are connected with a P1.5 port of the main control chip U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122382050.9U CN215733463U (en) | 2021-09-28 | 2021-09-28 | Lithium battery protection circuit for impact screwdriver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122382050.9U CN215733463U (en) | 2021-09-28 | 2021-09-28 | Lithium battery protection circuit for impact screwdriver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215733463U true CN215733463U (en) | 2022-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122382050.9U Expired - Fee Related CN215733463U (en) | 2021-09-28 | 2021-09-28 | Lithium battery protection circuit for impact screwdriver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215733463U (en) |
-
2021
- 2021-09-28 CN CN202122382050.9U patent/CN215733463U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220201 |