CN111745598B - Electric tool, battery pack and electric tool combination - Google Patents
Electric tool, battery pack and electric tool combination Download PDFInfo
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- CN111745598B CN111745598B CN201910245095.6A CN201910245095A CN111745598B CN 111745598 B CN111745598 B CN 111745598B CN 201910245095 A CN201910245095 A CN 201910245095A CN 111745598 B CN111745598 B CN 111745598B
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- energy storage
- electrically connected
- tool
- storage element
- battery pack
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses an electric tool, which is powered by a battery pack, wherein the battery pack is detachably mounted to the electric tool, and the electric tool comprises: the device comprises a tool positive terminal, a tool negative terminal, a functional piece, a motor driving circuit, an energy storage element and a delay control circuit; the delay control circuit is electrically connected with the energy storage element and is used for switching on the conductive path of the energy storage element within a preset time. The invention also discloses a combination comprising the battery pack and the electric tool. The electric tool can greatly reduce electric spark generated at the connecting terminal of the electric tool and the battery pack at the initial stage of mounting the battery pack to the electric tool.
Description
Technical Field
The present invention relates to a power tool, a battery pack, and a power tool assembly, and more particularly, to a power tool, a battery pack, and a power tool assembly capable of avoiding electric spark.
Background
The motor control system of the electric tool generally includes a capacitor with a large capacity, and when the battery pack is mounted to the electric tool, the battery pack charges the capacitor when the voltage of the capacitor terminal is low, and a large current is generated at the moment of charging, so that an electric spark is generated between the connection terminal of the electric tool and the connection terminal of the battery pack. Similarly, if a main switch of the power supply is provided in the tool, the capacitor is connected to the rear of the main switch of the power supply, and when the main switch of the power supply is turned off, the same problem as above is also existed, and the contact of the main switch of the power supply is also greatly damaged.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide an electric tool which is powered by a battery pack and can greatly reduce electric sparks generated at a connecting terminal of the battery pack when the battery pack is mounted to the electric tool. The invention also provides a battery pack and an electric tool combination, which can greatly reduce electric sparks generated at a connecting terminal of the battery pack when the battery pack is mounted to the electric tool.
In order to achieve the above object, the present invention adopts the following technical scheme:
a power tool powered using a battery pack detachably mounted to the power tool, the power tool comprising: the tool positive electrode terminal is used for connecting a positive electrode power supply terminal of the battery pack; a tool negative terminal for connection with a negative power terminal of the battery pack; a function member for realizing a function of the electric tool; a motor operatively connected to the function to drive the function to operate; the motor driving circuit is electrically connected with the motor and is used for driving the motor to output power; an energy storage element connected in parallel with the motor drive circuit; and the delay control circuit is electrically connected with the energy storage element and is used for switching on the conductive path of the energy storage element within a preset time.
Optionally, the delay control circuit includes: the switching element is electrically connected with the energy storage element and is used for switching on or switching off a conductive path of the energy storage element; the energy storage circuit is electrically connected with the switching element and is used for controlling the switching element to be conducted within a preset time; the switching element is connected in series between the tank circuit and the tank element.
Optionally, the switching element includes: a first switch end electrically connected with the tool negative terminal; the second switch end is electrically connected with the low-voltage end of the energy storage element and is electrically connected with the motor driving circuit;
optionally, the switching element includes: the first switch end is electrically connected with the low-voltage end of the energy storage element; the second switch end is electrically connected with the tool negative terminal and the motor driving circuit; and the control end is electrically connected with the energy storage circuit.
Optionally, the switching element includes: the first switch end is electrically connected with the positive electrode terminal of the tool; the second switch end is electrically connected with the high-voltage end of the energy storage element and is electrically connected with the motor driving circuit; and the control end is electrically connected with the energy storage circuit.
Optionally, the switching element includes: the first switch end is electrically connected with the positive electrode terminal of the tool and is electrically connected with the motor driving circuit; the second switch end is electrically connected with the high-voltage end of the energy storage element; and the control end is electrically connected with the energy storage circuit.
Optionally, the tank circuit includes: the high-voltage end of the first resistor is electrically connected with the positive electrode terminal of the tool; the high-voltage end of the second energy storage element is electrically connected with the low-voltage end of the first resistor, and the low-voltage end of the second energy storage element is electrically connected with the tool negative terminal.
Optionally, the tank circuit further comprises: and the discharge diode is connected with the first resistor in parallel.
Optionally, the tank circuit further comprises: and the negative electrode end of the voltage stabilizing diode is electrically connected with the low-voltage end of the first resistor, and the positive electrode end of the voltage stabilizing diode is electrically connected with the high-voltage end of the second energy storage element.
Optionally, the energy storage element is an electrolytic capacitor, and the capacitance value of the electrolytic capacitor is greater than or equal to 200uF.
Optionally, the voltage of the battery pack is greater than or equal to 18V.
A battery pack in combination with a power tool, the battery pack being removably mounted to the power tool, the battery pack comprising: the battery cell group comprises a plurality of battery cells which are electrically connected; a positive power terminal electrically connected to a positive electrode of the battery cell group; a negative power terminal electrically connected to a negative electrode of the battery cell group; the electric tool includes: a tool positive terminal for connection with a positive power terminal of the battery pack; a tool negative terminal for connection with a negative power terminal of the battery pack; a function member for realizing a function of the electric tool; a motor operatively connected to the function to drive the function to operate; the motor driving circuit is electrically connected with the motor and is used for driving the motor to output power; an energy storage element connected in parallel with the motor drive circuit; and the delay control circuit is electrically connected with the energy storage element and is used for switching on the conductive path of the energy storage element within a preset time.
Optionally, the energy storage element is an electrolytic capacitor, and the capacitance value of the electrolytic capacitor is greater than or equal to 200uF.
Optionally, the voltage of the battery pack is greater than or equal to 18V.
The invention has the advantages that: in the initial stage of the battery pack being mounted to the electric tool, the generation of electric sparks at the connection terminals of the electric tool and the battery pack can be greatly reduced.
Drawings
Fig. 1 is an external configuration view of an electric power tool as an embodiment;
fig. 2 is a circuit system diagram of the electric power tool of the first embodiment;
fig. 3 is a circuit system diagram of the electric power tool of the second embodiment;
fig. 4 is a circuit system diagram of the electric power tool of the third embodiment;
fig. 5 is a circuit system diagram of the electric power tool of the fourth embodiment.
Detailed Description
The invention is described in detail below with reference to the drawings and the specific embodiments.
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The power tool of the present invention includes, but is not limited to, the following: electric tools requiring speed regulation such as screw driver, electric drill, wrench, angle grinder, etc., electric tools which may be used for polishing workpieces such as sander, etc., and reciprocating saw, circular saw, curved saw, etc., may be used for cutting workpieces; electric hammers and the like may be used as power tools for impact use. These tools may also be garden-type tools such as lawnmowers, snowploughs, suction blowers, pruners and chain saws; in addition, these tools may also be used for other purposes, such as blenders. It is within the scope of the present invention to provide such power tools that can employ the following disclosed embodiments, particularly those having relatively high power that are powered by a battery pack having a voltage greater than or equal to 18V.
The electric tool includes: the tool positive electrode terminal is used for connecting a positive electrode power supply terminal of the battery pack; a tool negative terminal for connection with a negative power terminal of the battery pack; a function member for realizing a function of the electric tool; and the motor is operably connected with the functional piece to drive the functional piece to work.
Referring to fig. 1, as an example of an electric power tool 10 of an embodiment, the electric power tool 10 includes: a motor 11 (fig. 2), a chassis 12, a handle 13, wheels 14 and blades (not shown). Of course, the power tool 10 may also be a riding mower, or a power tool that performs other functions.
The blade, which is a functional part of the mower, is provided in the floor 12 for performing a mowing function of the mower.
The motor is used for driving the blade to rotate. The motor 11 is operatively connected to the tool accessory to drive the tool accessory in operation. For a mower, the functional element is a blade, and the motor 11 is operatively connected to the blade to drive the blade in rotation, thereby achieving a mowing function. The motor 11 may be directly connected to the blade or may be connected to the blade via a transmission or reduction mechanism to drive the blade.
The chassis 12 is used for carrying and mounting the motor 11. The chassis 12 is formed with a cutting cavity (not shown). The blade rotates within the cutting chamber. The motor 11 may be an electric motor or an internal combustion engine powered by fuel combustion. In some embodiments, the motor 11 is a brushless motor. The power tool 10 is powered by a battery pack 20, and the mower is provided with a battery compartment 17 for accommodating the battery pack 20, and the battery compartment 17 is provided at an upper portion of the chassis 12.
The handle 13 is to be held by a user to operate the power tool 10. For a lawnmower, the handle 13 is used to push the lawnmower. The handle 13 is connected to the chassis 12. For a push mower, the connecting rod 19 is also included. The link 19 connects the handle 13 and the chassis 12. As an alternative embodiment, the handle 13 may be provided as one piece with the connecting rod 19. The mower further comprises a trigger 15 and a switch box 16, the trigger 15 being used for controlling the motor. The trigger 15 is rotatably connected to a switch box 16, and the switch box 16 is fixed to the handle 13 or a link 19.
The wheels 14 rotate relative to the chassis 12 to enable movement of the mower over the ground. As an alternative embodiment, the mower includes a self-propelled motor that drives the wheels 14 in rotation.
As described above, the electric power tool 10 is not limited to the mower, and may be another electric power tool, such as a riding mower, a snowplow, a suction blower, a pruner, a garden-type electric power tool of a chain saw, a hand-held electric power tool such as a reciprocating saw, a circular saw, a jig saw, a circular saw, an angle grinder, an electric drill, a screwdriver, an electric drill, a wrench, or a bench-type tool.
Referring to fig. 2, the operation of the power tool 10 described above also relies on circuitry that includes circuit components, at least a portion of which are disposed on a circuit board (not shown) that is disposed in the housing 18 of the power tool 10.
The circuitry of the power tool 10 mainly includes: motor drive circuit 110, energy storage element 120, motor 11, and battery pack 20.
The battery pack 20 includes a housing 21 (fig. 1) and a plurality of battery cells 22 accommodated in the housing 21, wherein the battery cells 22 can be repeatedly charged, and the plurality of battery cells 22 are electrically connected to form a battery cell group 23. The battery pack 20 further includes a connection terminal for connection with the connection terminal of the power tool 10. The connection terminals of the battery pack 20 include a positive power terminal 23a and a negative power terminal 23b, and the positive power terminal 23a and the negative power terminal 23b are electrically connected to the positive and negative electrodes of the cell group 23, respectively.
The connection terminals of the power tool 10 include a tool positive terminal 10a and a tool negative terminal 10b for connection with a positive power terminal 23a and a negative power terminal 23b of the battery pack 20, respectively, to transmit electric power. When the battery pack 20 is mounted to the power tool 10, the positive power supply terminal 23a and the negative power supply terminal 23b of the battery pack 20 are electrically connected to the tool positive terminal 10a and the tool negative connection terminal 10b of the power tool 10, respectively.
The motor driving circuit 110 is used to drive the motor to output power. The motor driving circuit 110 is electrically connected to the motor 11 for driving the motor 11 to output power. As one embodiment, the motor 11 employs a brushless motor. The motor driving circuit 11 may employ a technology including a control chip, a driving chip, a switching circuit, etc., which are well known to those skilled in the art, and will not be described in detail herein.
The energy storage element 120 is connected in parallel with the motor drive circuit 110 for filtering and absorbing ripple effects. The energy storage element 120 is a capacitor with a relatively high capacitance, wherein the capacitance is greater than 200uF. In some embodiments, the capacitance is one of an electrolytic capacitance, a double layer capacitance, a thin film capacitance. Specifically, the energy storage element 120 includes at least one electrolytic capacitor C.
The electric tool 10 further includes a signal switch K electrically connected to the motor driving circuit 110, and the motor driving circuit 110 is capable of driving or stopping driving the motor 11 according to the on-off state of the signal switch K.
The signal switch K is connected with the trigger 15 in an associated way, and the signal switch K is triggered by the trigger 15 to change the on-off state. The signal switch K is electrically connected to the motor driving circuit 110, and the motor driving circuit 110 can detect the on-off state of the signal switch K, thereby driving the motor 11 or stopping driving the motor 11 according to the output signal corresponding to the state of the signal switch K.
In a conventional power tool, a main power switch is provided in series on an energizing circuit of the power tool, and is provided between the motor driving circuit 110 and the positive electrode terminal 10a of the tool, and is located at the front end of the energy storage element 110. When the battery pack 20 is mounted to the electric power tool, the motor driving circuit 110 is not powered if the main power switch is not triggered to the on state.
The energy storage element 110 is specifically a capacitor, and if the voltage difference between the initial voltage and the charging voltage on the capacitor is large, a large instantaneous current will be generated by the current formula i=c×dv/dt of the capacitor. Therefore, in an initial stage of mounting the battery pack 20 to the power tool 10, the voltage across the capacitor (the energy storage element 110) is low, the battery pack 20 charges the energy storage element 110, and a large current is generated at the moment of charging the energy storage element 110, and if the air gap does not exist stably at the connection terminal of the power tool 10 and the connection terminal of the battery pack 20, the large current breaks through the air gap, resulting in the generation of an electric spark between the connection terminal of the power tool 10 and the connection terminal of the battery pack 20.
Moreover, since the conventional power tool is provided with a power switch (fig. 1) connected to the positive terminal of the power tool, the energy storage element 110 is connected behind the power switch, and when the power switch is not yet fully closed, the contact of the power switch is ablated or stuck due to the large current, which can reduce the life of the power switch.
In this embodiment, the signal switch K is used instead of the conventional main power switch, and thus, a large current is not passed, so that the lifetime of the switch is not reduced, but due to the energy storage element 110, an electric spark is still generated between the connection terminal of the electric tool 10 and the connection terminal of the battery pack 20.
In order to solve the above-described problem, the electric power tool 10 of the present embodiment is provided with a delay control circuit 130. The delay control circuit 130 is electrically connected to the energy storage element 120, and is configured to switch on the conductive path of the energy storage element 120 within a preset time. In this way, the energy storage element 120 is turned on with a delay, and after the switching element VT1 is turned on with a delay, the battery pack 20 charges the energy storage element 120 again, and at this time, the battery pack 20 is in stable contact with the connection terminal of the electric tool 10, so that no spark is generated at the connection between the electric tool 10 and the battery pack 20.
The delay control circuit 130 includes: a switching element VT1 and an energy storage circuit, wherein the switching element VT1 is electrically connected to the energy storage element 120, for switching on or off a conductive path of the energy storage element 120; the energy storage circuit is electrically connected with the switching element VT1 and is used for controlling the switching element VT1 to be conducted in a preset time. The switching element VT1 may be a semiconductor switch, for example, a field effect transistor, a bipolar transistor, or the like.
The circuit tool 10 shown in fig. 2, the switching element VT1 of the delay control circuit 130, which is disposed between the tool negative terminal 10b and the energy storage element 120, is located on the main circuit of the power tool 10.
The switching element VT1 includes a first switching terminal a1, a second switching terminal b1, and a control terminal c1. Wherein the first switch end a1 is electrically connected with the tool negative terminal 10 b; the second switch terminal b1 is electrically connected to the low voltage terminal of the energy storage element 120 and is electrically connected to the motor driving circuit 110; the control terminal c1 is electrically connected with the tank circuit. The switching element VT1 can switch on or off the electrical connection of the energy storage element 120 to the tool negative terminal 10 b. The switching element VT1 can connect the energy storage element 120 to the tool negative terminal 10b and can connect the motor drive circuit 110 to the tool negative terminal 10 b.
As an alternative, the tank circuit includes: the high-voltage end of the first resistor R11 is electrically connected with the positive electrode terminal 10a of the tool, the high-voltage end of the second energy storage element C1 is electrically connected with the low-voltage end of the first resistor R11, and the low-voltage end of the second energy storage element C1 is electrically connected with the negative electrode terminal 10b of the tool. The high voltage end of the second energy storage element C1 is also electrically connected to the control end C1 of the switching element VT 1. The second energy storage element C1 is specifically a capacitor.
When the battery pack 20 is mounted to the power tool 10, the connection terminal of the battery pack 20 is connected to the connection terminal of the power tool 10, and then the battery pack 20 charges the second energy storage element C1 through the first resistor R11. After a preset period of time, the second energy storage element C1 is fully charged, which can provide the voltage for the switching element VT1 to turn on, so that the conductive path of the energy storage element 120 is turned on, and the battery pack 20 can charge the energy storage element 120, at which time the battery pack 20 is in stable contact with the connection terminal of the power tool 10, and no spark is generated at the connection between the power tool 10 and the battery pack 20. After this, the energy storage element 120 functions normally for filtering and absorbing ripple effects.
In order to ensure that the second energy storage element C1 is capable of providing a stable voltage to the switching element VT1 for conducting after being fully charged, the energy storage circuit further comprises a second resistor R12 as a pull-up resistor for providing a stable conducting voltage to the control terminal of the switching element VT 1.
Alternatively, the tank circuit further comprises a discharge diode D1. After the battery pack 20 is removed from the electric power tool 10, the second energy storage element C1 can be discharged through the discharge diode D1 without being discharged through the first resistor R11, so that the problem of slow discharge speed of the second energy storage element C1 through the first resistor R11 can be avoided. The second energy storage element C1 can be rapidly discharged by arranging the discharge diode D1.
Alternatively, the tank circuit includes a zener diode DZ1 for preventing overdischarge of the battery pack 10. The negative terminal of the zener diode DZ1 is electrically connected to the low voltage terminal of the first resistor R11, and the positive terminal of the zener diode DZ1 is electrically connected to the high voltage terminal of the second energy storage element C1. The breakdown voltage of the zener diode DZ1 is smaller than the voltage of the battery pack 20.
As an alternative, the electric tool further includes a third resistor R13 connected in parallel with the switching element VT1 for powering up the control chip or the like in the motor driving circuit 110 by a small current when the switching element VT1 is not turned on, so that the electric tool 10 cannot be turned on immediately due to the delayed turn-on of the switching element VT 1.
Specifically, both ends of the third resistor R13 are electrically connected to the first switching terminal a1 and the second switching terminal b1 of the switching element VT1, respectively.
After the battery pack 20 is mounted to the power tool 10, the positive power terminal 23a and the negative power terminal 23b of the battery pack 20 are respectively connected in contact with the tool positive terminal 10a and the tool negative terminal 10b of the power tool 10, the zener diode DZ1 operates in a reverse breakdown region, and the battery pack 20 charges the second energy storage element C1 through the first resistor R11 via the zener diode DZ 1.
When the voltage of the battery pack 20 is smaller than the breakdown voltage of the zener diode DZ1, the zener diode DZ1 cannot break down, the reverse resistance is large, the battery pack 20 cannot charge the second energy storage element C1 through the first resistor R11, the battery pack cannot supply power to the energy storage circuit, and overdischarge of the battery pack 20 can be avoided. Therefore, by providing the zener diode DZ1, the breakdown voltage of the zener diode DZ1 can be appropriately selected, and the overdischarge of the battery pack 20 can be avoided.
The electric power tool 30 of the second embodiment shown in fig. 3 has a tool positive electrode terminal 30a and a tool negative electrode terminal 30b for electrically connecting with the positive electrode power supply terminal 23a and the negative electrode power supply terminal 23b of the battery pack 20, respectively, and the electric power tool 30 circuit system includes: the motor 31, the motor driving circuit 310, the energy storage element 320, the delay control circuit 330, the signal switch K, the third resistor R33, and the like. The above-described circuit components of the circuit system of the power tool 30 are identical or similar to the component structures and functions of the circuit system of the power tool 10 shown in fig. 2, and will not be described again here.
The main difference between the power tool 30 shown in fig. 3 and the power tool 10 shown in fig. 2 is that the delay control circuits (130, 330) are different.
Specifically, the delay control circuit 330 of the electric tool 30 includes a switching element VT3 and a tank circuit including a first resistor R31 and a second tank element C3, and the tank circuit optionally includes a second resistor R32, a zener diode DZ3, and a discharge diode D3. The functions and the components of the energy storage circuit of the electric tool 30 are the same as or similar to those of the energy storage circuit of the electric tool 10, and will not be described herein. The difference is that the position, connection relation, and function of the switching element VT3 of the delay control circuit 330 are different from those of the electric power tool 10 shown in fig. 2.
The switching element VT3 of the delay control circuit 330 of the electric tool 30 shown in fig. 3 is disposed between the tool positive terminal 30a and the energy storage element 320. The switching element VT3 has a first terminal a3, a second terminal b3, and a control terminal c3. Wherein the first end a3 of the switching element VT3 is electrically connected to the tool positive terminal 30 a; the second switch terminal b3 of the switching element VT3 is electrically connected to the high voltage terminal of the energy storage element 320 and to the motor driving circuit 310; the control terminal c3 of the switching element VT3 is electrically connected to the tank circuit. Specifically, the control terminal of the switching element VT3 is electrically connected to the high voltage terminal of the second energy storage element C3. The switching element VT3 can make electrical connection of the energy storage element 320 and the tool positive terminal 30a, and can make electrical connection of the motor drive circuit 310 and the tool positive terminal 30 a.
Referring to fig. 4, as a third embodiment of the electric power tool 40, which has a tool positive electrode terminal 40a and a tool negative electrode terminal 40b for electrically connecting with the positive electrode power supply terminal 23a and the negative electrode power supply terminal 23b of the battery pack 20, respectively, the electric power tool 40 circuit system includes: a motor 41, a motor driving circuit 410, an energy storage element 420, a delay control circuit 430, a signal switch K, and the like. The above-described circuit components of the circuit system of the power tool 40 are identical or similar to the component structures and functions of the circuit system of the power tool 10 shown in fig. 2, and are not described here again.
The main difference between the power tool 40 shown in fig. 4 and the power tool 10 shown in fig. 2 is that the delay control circuits (130, 430) are different.
Specifically, the delay control circuit 430 of the electric tool 40 includes a switching element VT4 and a tank circuit including a first resistor R41 and a second tank element C4, and the tank circuit optionally includes a second resistor R42, a zener diode DZ4, and a discharge diode D4. The functions and the components of the energy storage circuit of the electric tool 40 are the same as or similar to those of the energy storage circuit of the electric tool 40, and will not be described herein. The difference is that the position, connection relation, and function of the switching element VT4 of the delay control circuit 430 are different from those of the electric power tool 10 shown in fig. 2.
The switching element VT4 of the delay control circuit 430 of the power tool 40 shown in fig. 4 is disposed between the tool negative terminal 40b and the energy storage element 420, and is located on a branch of the energy storage element 420. While the switching element VT1 of the delay control circuit 130 of the power tool 10 shown in fig. 2 is disposed between the tool negative terminal 10b and the energy storage element 120, but is located on the main circuit of the circuitry of the power tool 10.
In the electric power tool 40 shown in fig. 4, the switching element VT4 has a first end a4, a second end b4, and a control end c4. The first end a4 of the switching element VT4 is electrically connected to the low voltage end of the energy storage element 420, and the second end b4 of the switching element VT4 is electrically connected to the tool negative terminal 40b and the motor driving circuit 410. The switching element VT4 can switch on the electrical connection of the energy storage element 410 to the tool negative terminal 40b and can switch on the electrical connection of the motor drive circuit 410 to the energy storage element 420.
Referring to fig. 5, as a fourth embodiment of the electric power tool 50, which has a tool positive electrode terminal 50a and a tool negative electrode terminal 50b for electrically connecting with the positive electrode power supply terminal 23a and the negative electrode power supply terminal 23b of the battery pack 20, respectively, the electric power tool 50 circuit system includes: a motor 51, a motor driving circuit 510, an energy storage element 520, a delay control circuit 530, a signal switch K, and the like. The above-described circuit components of the circuit system of the power tool 50 are identical or similar to the component structures and functions of the circuit system of the power tool 40 shown in fig. 4, and will not be described again here.
The main difference between the electric power tool 50 shown in fig. 5 and the electric power tool 40 shown in fig. 4 is the delay control circuit.
Specifically, the delay control circuit 530 of the electric tool 50 includes a switching element VT5 and a tank circuit including a first resistor R51 and a second tank element C5, and the tank circuit optionally includes a second resistor R52, a zener diode DZ5, and a discharge diode D5. The functions and the components of the energy storage circuit of the electric tool 50 are the same as or similar to those of the energy storage circuit of the electric tool 50, and will not be described herein. The difference is that the position, connection relation, and function of the switching element VT5 of the delay control circuit 530 are different from those of the electric power tool 40 shown in fig. 4.
The switching element VT5 of the delay control circuit 530 of the electric tool 50 shown in fig. 5 is disposed between the positive electrode terminal 50a of the tool and the energy storage element 520, and is disposed on a branch of the energy storage element 520. The switching element VT5 has a first terminal a5, a second terminal b5, and a control terminal c5. Wherein, the first end a5 of the switching element VT5 is electrically connected to the tool positive terminal 30a and to the motor driving circuit 510; the second switch terminal b5 of the switching element VT5 is electrically connected to the high voltage terminal of the energy storage element 520; the control terminal c5 of the switching element VT5 is electrically connected to the tank circuit. Specifically, the control terminal C5 of the switching element VT5 is electrically connected to the high voltage of the second energy storage element C5. The switching element VT5 is capable of making an electrical connection between the energy storage element 520 and the tool positive terminal 50a, and of making an electrical connection between the energy storage element 520 and the motor drive circuit 510.
The electric tool shown in fig. 2 to 5 is provided with the delay control circuit, so that the energy storage element (120, 320, 420, 520) is not charged immediately after the battery pack is connected to the electric tool, but the electric conduction path of the energy storage element (120, 320, 420, 520) is connected after the preset time by the delay control circuit, so that the battery pack delays charging the energy storage element (120, 320, 420, 520), and the battery pack is in stable contact with the connecting terminal of the electric tool at the moment, so that sparks are not generated at the connecting position of the electric tool 10 and the battery pack 20. Therefore, the electric tool can solve the problem that electric sparks are generated at the connecting terminal at the moment when the battery pack is inserted into the electric tool, and has very important significance especially for the electric tools with larger power and larger voltage of the used power supply battery pack. In the electric tools (10, 30) shown in fig. 2 and 3, the switching elements (VT 1, VT 4) of the delay control circuits (130, 330) are disposed on the main circuit of the circuit system, so that the system and the energy storage elements (120, 320) have good working synchronism and are stable. In the electric tools (40, 50) shown in fig. 4 and 5, switching elements (VT 4, VT 5) of the delay control circuits (430, 530) are provided on the energy storage element (420, 520) branch, and the switching elements (VT 4, VT 5) pass only the current on the energy storage element (420, 520) branch, so that the heat generation amount is small and the power loss is small.
The invention also provides a battery pack and power tool combination, the battery pack being detachably mounted to the power tool.
The battery pack includes: the battery cell group comprises a plurality of battery cells which are electrically connected; a positive power terminal electrically connected to a positive electrode of the battery cell group; and the negative electrode power supply terminal is electrically connected to the negative electrode of the battery cell group.
The electric tool includes: the tool positive terminal is used for connecting a positive power terminal of the battery pack; a tool negative terminal for connection with a negative power terminal of the battery pack; a function member for realizing a function of the electric tool; a motor operatively connected to the function to drive the function to operate; the motor driving circuit is electrically connected with the motor and is used for driving the motor to output power; an energy storage element connected in parallel with the motor drive circuit; and the delay control circuit is electrically connected with the energy storage element and is used for switching on the conductive path of the energy storage element within a preset time. The electric tool and the battery pack may be any of the above embodiments, and will not be described herein.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the invention in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the invention.
Claims (13)
1. A power tool powered using a battery pack detachably mounted to the power tool, the power tool comprising:
the tool positive electrode terminal is used for connecting a positive electrode power supply terminal of the battery pack;
a tool negative terminal for connection with a negative power terminal of the battery pack;
a function member for realizing a function of the electric tool;
a motor operatively connected to the function to drive the function to operate;
the motor driving circuit is electrically connected with the motor and is used for driving the motor to output power;
an energy storage element connected in parallel with the motor drive circuit;
the delay control circuit is electrically connected with the energy storage element and is used for switching on a conductive path of the energy storage element within a preset time;
the delay control circuit includes:
the switching element is electrically connected with the energy storage element and is used for switching on or switching off a conductive path of the energy storage element;
the energy storage circuit is electrically connected with the switching element and is used for controlling the switching element to be conducted within a preset time;
the switching element is connected in series between the energy storage circuit and the energy storage element;
the power tool further includes: and a third resistor connected in parallel with the switching element for powering up the motor driving circuit when the switching element is not turned on.
2. The power tool of claim 1, wherein:
the switching element includes:
a first switch end electrically connected with the tool negative terminal;
the second switch end is electrically connected with the low-voltage end of the energy storage element and is electrically connected with the motor driving circuit;
and the control end is electrically connected with the energy storage circuit.
3. The power tool of claim 1, wherein:
the switching element includes:
the first switch end is electrically connected with the low-voltage end of the energy storage element;
the second switch end is electrically connected with the tool negative terminal and the motor driving circuit;
and the control end is electrically connected with the energy storage circuit.
4. The power tool of claim 1, wherein:
the switching element includes:
the first switch end is electrically connected with the positive electrode terminal of the tool;
the second switch end is electrically connected with the high-voltage end of the energy storage element and is electrically connected with the motor driving circuit;
and the control end is electrically connected with the energy storage circuit.
5. The power tool of claim 1, wherein:
the switching element includes:
the first switch end is electrically connected with the positive electrode terminal of the tool and is electrically connected with the motor driving circuit;
the second switch end is electrically connected with the high-voltage end of the energy storage element;
and the control end is electrically connected with the energy storage circuit.
6. The power tool of claim 1, wherein:
the tank circuit includes:
the high-voltage end of the first resistor is electrically connected with the positive electrode terminal of the tool;
the high-voltage end of the second energy storage element is electrically connected with the low-voltage end of the first resistor, and the low-voltage end of the second energy storage element is electrically connected with the tool negative terminal.
7. The power tool of claim 6, wherein:
the tank circuit further includes:
and the discharge diode is connected with the first resistor in parallel.
8. The power tool of claim 6, wherein:
the tank circuit further includes:
and the negative electrode end of the voltage stabilizing diode is electrically connected with the low-voltage end of the first resistor, and the positive electrode end of the voltage stabilizing diode is electrically connected with the high-voltage end of the second energy storage element.
9. The power tool of claim 1, wherein: the energy storage element is an electrolytic capacitor, and the capacitance value of the electrolytic capacitor is greater than or equal to 200uF.
10. The power tool of claim 1, wherein: the voltage of the battery pack is greater than or equal to 18V.
11. A battery pack in combination with a power tool, the battery pack being removably mounted to the power tool, the battery pack comprising:
the battery cell group comprises a plurality of battery cells which are electrically connected;
a positive power terminal electrically connected to a positive electrode of the battery cell group;
a negative power terminal electrically connected to a negative electrode of the battery cell group;
the electric tool includes:
a tool positive terminal for connection with a positive power terminal of the battery pack;
a tool negative terminal for connection with a negative power terminal of the battery pack;
a function member for realizing a function of the electric tool;
a motor operatively connected to the function to drive the function to operate;
the motor driving circuit is electrically connected with the motor and is used for driving the motor to output power;
an energy storage element connected in parallel with the motor drive circuit;
the delay control circuit is electrically connected with the energy storage element and is used for switching on a conductive path of the energy storage element within a preset time;
the delay control circuit includes:
the switching element is electrically connected with the energy storage element and is used for switching on or switching off a conductive path of the energy storage element;
the energy storage circuit is electrically connected with the switching element and is used for controlling the switching element to be conducted within a preset time;
the switching element is connected in series between the energy storage circuit and the energy storage element;
the power tool further includes: and a third resistor connected in parallel with the switching element for powering up the motor driving circuit when the switching element is not turned on.
12. The battery pack and power tool combination of claim 11, wherein: the energy storage element is an electrolytic capacitor, and the capacitance value of the electrolytic capacitor is greater than or equal to 200uF.
13. The battery pack and power tool combination of claim 11, wherein: the voltage of the battery pack is greater than or equal to 18V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910245095.6A CN111745598B (en) | 2019-03-28 | 2019-03-28 | Electric tool, battery pack and electric tool combination |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910245095.6A CN111745598B (en) | 2019-03-28 | 2019-03-28 | Electric tool, battery pack and electric tool combination |
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| CN111745598B true CN111745598B (en) | 2023-06-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115224455B (en) * | 2021-04-15 | 2024-08-02 | 南京泉峰科技有限公司 | Battery pack and electric tool |
| CN117584088A (en) * | 2022-08-11 | 2024-02-23 | 南京泉峰科技有限公司 | Electric tool |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2577504Y (en) * | 2002-10-09 | 2003-10-01 | 全捷 | Electronic soft-start module for electric tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6603221B1 (en) * | 1999-04-22 | 2003-08-05 | Zhongdu Liu | Solid state electrical switch |
| TWI420813B (en) * | 2009-10-27 | 2013-12-21 | Pegatron Corp | Power connecting management device |
| CN102055304B (en) * | 2009-10-28 | 2013-01-30 | 和硕联合科技股份有限公司 | Power connection management device |
| CN201928250U (en) * | 2010-12-20 | 2011-08-10 | 惠州三华工业有限公司 | Power-up time delay circuit |
| CN206564463U (en) * | 2017-03-08 | 2017-10-17 | 厦门汉印电子技术有限公司 | A kind of arc-suppression circuit and the small household appliances equipment containing the circuit |
| CN207676244U (en) * | 2018-01-22 | 2018-07-31 | 上海派笙电子科技有限公司 | Anti- battery for electric tool accesses ignition device and electric tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2577504Y (en) * | 2002-10-09 | 2003-10-01 | 全捷 | Electronic soft-start module for electric tool |
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