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CN217036786U - BMS protection board circuit of electric tool - Google Patents

BMS protection board circuit of electric tool Download PDF

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Publication number
CN217036786U
CN217036786U CN202123426091.XU CN202123426091U CN217036786U CN 217036786 U CN217036786 U CN 217036786U CN 202123426091 U CN202123426091 U CN 202123426091U CN 217036786 U CN217036786 U CN 217036786U
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China
Prior art keywords
electrically connected
circuit
resistor
main control
mos tube
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CN202123426091.XU
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Chinese (zh)
Inventor
余翔
余建华
涂仲华
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Huizhou Saiwang Electronics Co ltd
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Huizhou Saiwang Electronics Co ltd
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Abstract

The utility model discloses a BMS protection board circuit of an electric tool, which comprises: one end of the charge-discharge switch circuit is electrically connected with the battery pack, the other end of the charge-discharge switch circuit is electrically connected with the positive electrode of the load/charger, and the control end of the charge-discharge switch circuit is electrically connected with the main control circuit; it should be noted that the charge and discharge switch circuit is used for realizing charge and discharge control of the battery pack; the main control circuit is used for realizing the control of the whole circuit. According to the utility model, the MOS tube Q1 and the MOS tube Q2 are arranged in the charge-discharge switch circuit, compared with the existing protection circuit, the MOS tube can be effectively combined on the same circuit board, so that the use of an MCU (microprogrammed control unit) of a charging control board and the use of the charging MOS tube are reduced, the circuit cost is saved, the whole circuit is more compact by controlling the two MOS tubes through one main control circuit, the control efficiency can be improved, the charge-discharge performance of the lithium battery is improved, and the cost and the power consumption are reduced.

Description

BMS protection board circuit of electric tool
Technical Field
The utility model relates to the field of BMS protection circuits, in particular to a BMS protection board circuit of an electric tool.
Background
At present, a charging circuit and a lithium battery protection circuit of most electric tools are separated and produced by different manufacturers (a charger manufacturer and a lithium battery Pack manufacturer). In the two control boards, the charging control board comprises a charging MosFET, and the lithium battery protection board also comprises a protection board and a discharging protection board. In the same loop, 2 charging tube control units appear, which causes the increase of cost, and the MosFET has internal resistance, which causes the increase of main loop impedance, the decrease of discharge performance, the heat generation of products in use and the like, so that the overall performance is decreased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provides the BMS protection board circuit of the electric tool, which can improve the charge and discharge performance of a lithium battery and reduce the cost and power consumption of the circuit.
The purpose of the utility model is realized by the following technical scheme:
a power tool BMS protection board circuit for connecting a battery pack, comprising: the charging and discharging control circuit comprises a charging and discharging switch circuit and a main control circuit, wherein one end of the charging and discharging switch circuit is electrically connected with a battery pack, the other end of the charging and discharging switch circuit is electrically connected with a positive electrode of a load/charger, and a control end of the charging and discharging switch circuit is electrically connected with the main control circuit;
the charge-discharge switch circuit comprises a MOS tube Q1 and a MOS tube Q2, the S pole of the MOS tube Q1 is used for being electrically connected with the positive pole of the battery pack, the D pole of the MOS tube Q1 is electrically connected with the D pole of the MOS tube Q2, the S pole of the MOS tube Q2 is used for being electrically connected with an external load/charger, the MOS tube Q1 and the G pole of the MOS tube Q2 are respectively electrically connected with the control end of the main control circuit.
Preferably, the main control circuit includes a main control chip, a voltage detection unit, a current detection unit and a temperature detection unit, the control end of the main control chip is electrically connected to the G pole of the MOS transistor Q1 and the MOS transistor Q2, and the main control chip is further electrically connected to the voltage detection unit, the current detection unit and the temperature detection unit respectively.
Preferably, the voltage detection unit includes a diode D1 and a resistor R6, an anode of the diode D1 is electrically connected to an anode of the battery pack, and a cathode of the diode D1 is electrically connected to the pin 43 of the main control chip via the resistor R6.
Preferably, the current detection unit includes a resistor R31, a resistor R32, a resistor R33, and a capacitor C14, a first end of the resistor R32 is electrically connected to the negative electrode of the battery pack, a second end of the resistor R32 is electrically connected to a load/charger, one end of the resistor R31 is electrically connected to the first end of the resistor R32, the other end of the resistor R31 is electrically connected to the main control chip, one end of the resistor R33 is electrically connected to the second end of the resistor R32, the other end of the resistor R33 is electrically connected to the main control chip, and two ends of the capacitor C14 are electrically connected to the resistor R31 and the resistor R33, respectively.
Preferably, the temperature detection unit includes a thermistor NTC and a capacitor C1, one end of the thermistor NTC is electrically connected to the main control chip, the other end of the thermistor NTC is grounded, and the capacitor C1 is connected in parallel to the thermistor NTC.
Preferably, the electric tool BMS protection board circuit further includes a power supply unit electrically connected to the battery pack and the main control circuit, respectively.
Preferably, the power supply unit includes a diode D2 and a resistor R7, an anode of the diode D2 is electrically connected to the charge and discharge switching circuit, and a cathode of the diode D2 is electrically connected to the battery pack and the resistor R7, respectively.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
the utility model relates to a BMS protection board circuit of an electric tool, wherein an MOS tube Q1 and an MOS tube Q2 are arranged on a charge-discharge switch circuit, compared with the existing protection circuit, the MOS tube can be effectively combined on the same circuit board, so that the use of an MCU (microprogrammed control unit) of a charging control board and the use of the charging MOS tube are reduced, the circuit cost is saved, and two MOS tubes are controlled by a main control circuit, so that the whole circuit is more compact, the control efficiency can also be improved, the charge-discharge performance of a lithium battery is improved, and the cost and the power consumption are reduced.
Drawings
Fig. 1 is a circuit diagram of a BMS protection board circuit of an electric tool BMS according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the utility model, the utility model will now be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, a BMS protection board circuit of a power tool for connecting a battery pack includes: the charging and discharging control circuit comprises a charging and discharging switch circuit and a main control circuit, wherein one end of the charging and discharging switch circuit is used for being electrically connected with a battery pack, the other end of the charging and discharging switch circuit is used for being electrically connected with a positive electrode of a load/charger, and a control end of the charging and discharging switch circuit is electrically connected with the main control circuit; the charging and discharging switch circuit is used for realizing charging and discharging control on the battery pack; the main control circuit is used for realizing the control of the whole circuit.
Referring to fig. 1, the charge and discharge switching circuit includes a MOS transistor Q1 and a MOS transistor Q2, an S-electrode of the MOS transistor Q1 is used for being electrically connected to an anode of the battery pack, a D-electrode of the MOS transistor Q1 is connected to a D-electrode of the MOS transistor Q2, an S-electrode of the MOS transistor Q2 is used for being electrically connected to an external load/charger, and G-electrodes of the MOS transistor Q1 and the MOS transistor Q2 are respectively electrically connected to a control terminal of the main control circuit.
So, through set up MOS pipe Q1 and MOS pipe Q2 at charge-discharge switch circuit, compare in current protection circuit, can close the MOS pipe on same circuit board effectively, thereby the MCU of the control panel that charges and the use of the MOS pipe that charges have been reduced, thereby save the circuit cost, and through two MOS pipes of a master control circuit control, make whole circuit compacter, also can improve control efficiency, improve lithium cell charge-discharge performance, the cost is reduced and the consumption.
It should be noted that the main control circuit includes a main control chip, a voltage detection unit, a current detection unit and a temperature detection unit, the control end of the main control chip is electrically connected to the G pole of the MOS transistor Q1 and the MOS transistor Q2, and the main control chip is further electrically connected to the voltage detection unit, the current detection unit and the temperature detection unit, respectively. The main control chip is used for controlling the charge-discharge switching circuit, the voltage detection unit, the current detection unit and the temperature detection unit, so that the control efficiency is improved, and the stability of the circuit is further improved.
Referring to fig. 1, the voltage detection unit includes a diode D1 and a resistor R6, an anode of the diode D1 is electrically connected to an anode of the battery pack, and a cathode of the diode D1 is electrically connected to a pin 43 of the main control chip through the resistor R6. In this way, by providing the diode D1 and the resistor R6, the voltage sampling for charging or discharging the battery pack can be performed, and further, the voltage can be detected and controlled.
The current detection unit includes resistance R31, resistance R32, resistance R33 and electric capacity C14, resistance R32's first end with the negative pole electricity of group battery is connected, resistance R32's second end is used for being connected with load/charger electricity, resistance R31's one end with resistance R32's first end electricity is connected, resistance R31's the other end with the main control chip electricity is connected, resistance R33's one end with resistance R32's second end electricity is connected, resistance R33's the other end with the main control chip electricity is connected, electric capacity C14's both ends respectively with resistance R31 with resistance R33 electricity is connected. In this way, by setting the sampling resistor R32, the current can be sampled, and the current detection function can be realized.
Referring to fig. 1, the temperature detecting unit includes a thermistor NTC and a capacitor C1, one end of the thermistor NTC is electrically connected to the main control chip, the other end of the thermistor NTC is grounded, and the capacitor C1 is connected to the thermistor NTC in parallel. Thus, by arranging the thermistor NTC and the capacitor C1, the temperature of the protection board can be detected, and the safety is improved.
Referring to fig. 1, the BMS protection board circuit of the electric tool further includes a power supply unit electrically connected to the battery pack and the main control circuit, respectively. Specifically, the power supply unit comprises a diode D2 and a resistor R7, an anode of the diode D2 is electrically connected with the charge and discharge switching circuit, and a cathode of the diode D2 is electrically connected with the battery pack and the resistor R7 respectively. In this manner, the diode D2 and the resistor R7 are provided, so that power can be supplied to the main control chip.
In addition, the master control circuit further comprises a signal sending unit, a signal receiving unit and a secondary protection unit, wherein the signal sending unit comprises two triodes, and a resistor R26, a resistor R27, a resistor R28, a voltage stabilizing tube ZD2, a diode D4 and the like which are arranged around the triodes; the signal receiving unit comprises a triode Q5, an MOS tube Q4, a diode D3 and surrounding electronic components; the secondary protection unit comprises a MOS transistor Q3, a resistor R20, a resistor R21 and the like. Therefore, the sending and receiving of signals can be realized, and the secondary protection of the circuit can be realized, wherein the secondary protection unit is mainly connected with a fuse with three ends, and the fuse with three ends is used on the main line to realize the secondary protection function.
The above embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (7)

1. A power tool BMS protection board circuit for connecting a battery pack, comprising: the charging and discharging control circuit comprises a charging and discharging switch circuit and a main control circuit, wherein one end of the charging and discharging switch circuit is used for being electrically connected with a battery pack, the other end of the charging and discharging switch circuit is used for being electrically connected with a positive electrode of a load/charger, and a control end of the charging and discharging switch circuit is electrically connected with the main control circuit;
the charge and discharge switch circuit comprises a MOS tube Q1 and a MOS tube Q2, the S pole of the MOS tube Q1 is used for being electrically connected with the positive pole of the battery pack, the D pole of the MOS tube Q1 is electrically connected with the D pole of the MOS tube Q2, the S pole of the MOS tube Q2 is used for being electrically connected with an external load/charger, and the G pole of the MOS tube Q1 and the G pole of the MOS tube Q2 are respectively electrically connected with the control end of the main control circuit.
2. The BMS protection board circuit according to claim 1, wherein the main control circuit comprises a main control chip, a voltage detection unit, a current detection unit and a temperature detection unit, wherein a control terminal of the main control chip is electrically connected to the G poles of the MOS transistor Q1 and the MOS transistor Q2, and the main control chip is further electrically connected to the voltage detection unit, the current detection unit and the temperature detection unit respectively.
3. The BMS protection board circuit according to claim 2, wherein the voltage detection unit comprises a diode D1 and a resistor R6, the anode of the diode D1 is electrically connected to the positive electrode of the battery pack, and the cathode of the diode D1 is electrically connected to the 43 th pin of the main control chip via the resistor R6.
4. The BMS protection board circuit of claim 2, wherein the current detection unit comprises a resistor R31, a resistor R32, a resistor R33 and a capacitor C14, wherein a first end of the resistor R32 is electrically connected to the negative electrode of the battery pack, a second end of the resistor R32 is electrically connected to a load/charger, one end of the resistor R31 is electrically connected to a first end of the resistor R32, the other end of the resistor R31 is electrically connected to the main control chip, one end of the resistor R33 is electrically connected to a second end of the resistor R32, the other end of the resistor R33 is electrically connected to the main control chip, and two ends of the capacitor C14 are electrically connected to the resistor R31 and the resistor R33, respectively.
5. The BMS protection board circuit of claim 2, wherein the temperature sensing unit comprises a thermistor NTC of which one end is electrically connected to the main control chip and the other end is grounded, and a capacitor C1 connected in parallel to the thermistor NTC.
6. The power tool BMS protection board circuit according to claim 1, characterized in that it further comprises a power supply unit electrically connected to the battery pack and the main control circuit, respectively.
7. The BMS protection board circuit of the power tool as claimed in claim 6, wherein the power supply unit comprises a diode D2 and a resistor R7, the anode of the diode D2 is electrically connected to the charge and discharge switching circuit, and the cathode of the diode D2 is electrically connected to the battery pack and the resistor R7, respectively.
CN202123426091.XU 2021-12-31 2021-12-31 BMS protection board circuit of electric tool Active CN217036786U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202123426091.XU CN217036786U (en) 2021-12-31 2021-12-31 BMS protection board circuit of electric tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202123426091.XU CN217036786U (en) 2021-12-31 2021-12-31 BMS protection board circuit of electric tool

Publications (1)

Publication Number Publication Date
CN217036786U true CN217036786U (en) 2022-07-22

Family

ID=82444923

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202123426091.XU Active CN217036786U (en) 2021-12-31 2021-12-31 BMS protection board circuit of electric tool

Country Status (1)

Country Link
CN (1) CN217036786U (en)

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