A power tool and discharge system

Abstract

The application discloses an electric tool and a discharging system. A battery pack comprises a first positive terminal, a first negative terminal, a first controller and a first state detection terminal. The electric tool comprises a second positive terminal, a second negative terminal, a second controller, a power supply module for supplying power to the second controller and a power-on module connected to the power supply module. The power-on module is connected to the first state detection terminal when the battery pack is plugged into the electric tool. The first state detection terminal controls the on-off of the power-on module according to the state of the battery pack, so as to control whether the electric tool is powered on. According to the application, the state detection terminal of the battery pack is directly connected to the power-on module of the electric tool. When the battery pack is abnormal, the power-on module cannot be powered on, i.e. the electric tool cannot be powered on. Therefore, the abnormal protection can be performed in time, and no loss is caused after the battery pack is abnormal.

Description

[Technical Field]

[0001] This invention relates to an electric tool and a discharge system. [Background Technology]

[0002] As the power demands of power tools increase, the requirements for battery pack status monitoring, which serves as the energy source for DC power tools, are also becoming more stringent in order to prevent serious damage to the battery pack. Existing power tools send the abnormal status of the battery pack to the power tool via status detection terminals. The power tool's controller input receives this status and performs protection. Typically, the protection is performed within the power tool itself. However, when the battery pack experiences an undervoltage abnormality, since the battery pack needs to provide power to the power tool to enable the controller's protection operation, the battery pack continues to consume power under undervoltage conditions, failing to provide timely protection, resulting in wasted or damaged battery pack energy.

[0003] Please refer to Chinese Invention Patent No. CN101662048B, published on October 5, 2011. It discloses that the power module of the battery pack control unit is set in the tool, and the power module also provides power to the tool control unit. The battery pack needs to be plugged into the tool and the trigger switch is closed. That is to say, when the battery pack is not plugged in or the trigger switch is not closed, the electronic components in the battery pack do not work, thereby effectively avoiding unnecessary power consumption in the battery pack. However, the status indicator terminal indicating the battery's working status is connected to the tool control unit. In case of abnormality, the tool control unit still needs to protect it, and it cannot provide timely protection.

[0004] Therefore, it is necessary to design a power tool and discharge system that provides timely and energy-saving protection to solve the above problems. [Summary of the Invention]

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a power tool and discharge system that provides timely and energy-saving protection, so as to solve the above-mentioned problems.

[0006] The present invention addresses the problems of the prior art by employing the following technical solution: a discharge system comprising a battery pack and a power tool, wherein the battery pack comprises: a first positive terminal, a first negative terminal, a first controller, and a first state detection terminal connected to the first controller; the power tool comprises a second positive terminal and a second negative terminal; the second positive terminal and the second negative terminal are electrically in contact with the first positive terminal and the first negative terminal of the battery pack, respectively; the power tool further comprises a second controller, a power supply module for supplying power to the second controller, and a power-on module connected to the power supply module; the power-on module is connected to the first state detection terminal when the battery pack is plugged into the power tool, and the first state detection terminal controls the on / off state of the power-on module according to the state of the battery pack, thereby controlling whether the power tool is powered on.

[0007] A further improvement is as follows: the power-on module includes a second state detection terminal connected to the first state detection terminal, the second state detection terminal is connected to a first switch, the first switch is connected to a second switch, and the second switch is connected to the second positive terminal and the power module.

[0008] A further improvement is as follows: the power module includes a switching circuit and a voltage regulator circuit connected to the switching circuit.

[0009] A further improvement is as follows: the switching circuit includes a third switch and a fourth switch, the base of the third switch is connected to the second switch, the collector of the third switch is connected to the emitter of the fourth switch, the base of the fourth switch is connected to the second positive terminal, and the collector of the fourth switch is connected to the voltage regulator circuit.

[0010] A further improvement is as follows: the power tool includes a trigger, which is disposed on the second positive terminal and located between the power module and the power-on module.

[0011] A further improvement is as follows: the first state detection terminal is connected to the first positive terminal, and the first state detection terminal includes a protection switch connected to the first controller.

[0012] A further improvement is to connect the first state detection terminal to the output port of the first controller.

[0013] The present invention can also solve the problems of the prior art by adopting the following technical solution: an electric tool, the electric tool being detachably connected to a battery pack, the electric tool including: a second positive terminal electrically connected to a first positive terminal of the battery pack, a second negative terminal electrically connected to a first negative terminal of the battery pack, the electric tool further including a second controller, a power supply module for supplying power to the second controller, and a power-on module connected to the power supply module, the power-on module controlling the on / off state of the power supply module according to the state of the battery pack, so as to control whether the electric tool is powered on.

[0014] A further improvement is as follows: the power-on module includes a second state detection terminal, the second state detection terminal is connected to a first switch, the first switch is connected to a second switch, and the second switch is connected to the second positive terminal and the power module.

[0015] A further improvement is as follows: the power module includes a switching circuit and a voltage regulator circuit connected to the switching circuit.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The power tool is equipped with a second controller, a power supply module for supplying power to the second controller, and a power-on module connected to the power supply module. When the battery pack is plugged into the power tool, the power-on module is connected to the first state detection terminal of the battery pack. The first state detection terminal controls the on / off state of the power-on module according to the state of the battery pack, so as to control whether the power tool is powered on. The state detection terminal of the battery pack is directly connected to the power-on module of the power tool, which can control the power-on module to not be powered when the battery pack is abnormal, that is, the tool is not powered on. It can provide timely abnormal protection and will not cause damage after the battery pack is abnormal. [Attached Image Description]

[0017] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings:

[0018] Figure 1 This is a perspective view of the battery pack and power tool of the present invention;

[0019] Figure 2 This is a circuit diagram of the battery pack and power tool according to the first embodiment of the present invention;

[0020] Figure 3 This is a circuit diagram of the battery pack and power tool according to the second embodiment of the present invention.

[0021] Meaning of the reference numerals in the diagram:

[0022] 100, 100', Battery Pack 101, 101', First Positive Terminal 102, 102', First Negative Terminal 103, 103', First Controller 104, 104', First Status Detection Terminal 105, 105', Temperature Sensor 106, Protection Switch 200, Power Tool 201, Second Positive Terminal 202, Second Negative Terminal 203, Second Controller 204, Drive Module 205, Sampling Circuit 206, Trigger 1, Power Module 2, Power-On Module 21, Second Status Detection Terminal 22, First Switch 23, Second Switch 24, Third Switch 25, Fourth Switch 26, Second Voltage Regulator Circuit

Detailed Implementation Methods

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0024] Please see Figure 1 As shown, this invention relates to a discharge system including a battery pack 100 and a power tool 200, wherein the battery pack 100 is detachably mounted to the power tool 200.

[0025] Please see Figure 2 The diagram shown is a circuit diagram of a discharge system according to a first embodiment of the present invention. The battery pack 100 includes: a battery cell, a first positive terminal 101, a first negative terminal 102, a first controller 103, a first state detection terminal 104 connected to the first controller 103, and a temperature sensor 105. The first controller 103 detects data such as the voltage of each battery cell and the temperature of the temperature sensor 105. The first state detection terminal 104 is connected to the first positive terminal 101, and the first state detection terminal 104 includes a protection switch 106 connected to the first controller 103. The protection switch 106 is a MOSFET; in other embodiments, it can also be a transistor. The source of the protection switch 106 is connected to the first positive terminal 101, the gate of the protection switch 106 is connected to the input terminal of the first controller 103 through a transistor Q1, and the drain of the protection switch 106 is connected to the first state detection terminal 102. 04. The first controller 103 detects the status of the battery pack 100. If the battery pack 100 is determined to be normal based on the voltage of each cell and the temperature of the battery pack, the first controller 103 controls the transistor Q1 to conduct so that the protection switch 106 is turned on. Therefore, the first status detection terminal 104 is connected to the first positive terminal 101. If the battery pack 100 is abnormal, the first controller 103 controls the transistor Q1 to turn off so that the protection switch 106 is turned off. Therefore, the first status detection terminal 104 is disconnected from the first positive terminal 101.

[0026] The power tool 200 includes a second positive terminal 201 and a second negative terminal 202, which are electrically connected to the first positive terminal and the first negative terminal of the battery pack, respectively. The power tool 200 also includes a second controller 203, a drive module 204 connected to the second controller 203, a power module 1 for supplying power to the second controller 203, and a power-on module 2 connected to the power module 1. When the battery pack 100 is plugged into the power tool 200, the power-on module 2 is connected to the first status detection terminal 104. The first status detection terminal 104 controls the on / off state of the power-on module 2 according to the state of the battery pack 100 to control whether the power tool 200 is powered on.

[0027] The power-on module 2 includes a second state detection terminal 21 connected to the first state detection terminal 104. The second state detection terminal 21 is connected to a first switch 22, the first switch 22 is connected to a second switch 23, and the second switch 23 is connected to the second positive terminal 201 and the power module 1. Specifically, the first switch 22 is a MOSFET, the second switch 23 is a transistor, the second state detection terminal 21 is connected to the first switch 22 through a resistor R1 and a resistor R2 connected in series, the second state detection terminal 21 is connected to one end of the resistor R1, the connection point of the resistor R1 and the resistor R2 is connected to the gate of the first switch 22, the source of the first switch 22 is connected to the other end of the resistor R2 and grounded, a Zener diode ZD1 is connected in parallel across the resistor R2, the drain of the first switch 22 is connected to the base of the second switch 23, the emitter of the second switch 23 is connected to the second positive terminal 201, and the collector of the second switch 23 is connected to the power module 1.

[0028] The power module 1 includes a switching circuit and a voltage regulator circuit connected to the switching circuit. The switching circuit includes a third switch 24 and a fourth switch 25, both of which are transistors. The base of the third switch 24 is connected to the collector of the second switch 23. The collector of the third switch 24 is connected to the emitter of the fourth switch 25, and the base of the fourth switch 25 is connected to the second positive terminal 201. The collector of the fourth switch 25 is connected to the voltage regulator circuit. The voltage regulator circuit includes a first voltage regulator circuit and a second voltage regulator circuit 26. The first voltage regulator circuit includes a transistor Q2 and a Zener diode ZD2. The collector of the transistor Q2 is connected to the collector of the fourth switch 25, and the base of the transistor Q2 is connected to the Zener diode ZD2. The emitter of the transistor Q2 is connected to the second voltage regulator circuit 26, which is a voltage regulator chip. The power tool 200 also includes a sampling circuit 205, which includes a motor back-electricity detection circuit, a temperature detection circuit, etc. The first voltage regulator circuit and the second voltage regulator circuit 26 can step down the battery voltage to two different voltages, such as 15V and 5V, to power the second controller 203 and the sampling circuit 205. In other embodiments, the first voltage regulator circuit can also be replaced by a voltage regulator chip, and the output voltage of the voltage regulator circuit is determined by the specific circuit. The power tool 200 also includes a trigger 206, which is disposed on the second positive terminal 201 and located between the power module 1 and the power-on module 2.

[0029] The specific discharge process includes: plugging the battery pack 100 into the power tool 200, connecting the first positive terminal 101 to the second positive terminal 201, connecting the first negative terminal 102 to the second negative terminal 202, powering on the battery pack 100, and determining whether the voltage of each cell of the battery pack 100 is overcharged or over-discharged by the first controller 103, and detecting whether the battery pack 100 is overheated by the temperature sensor 105. If an abnormality occurs, the first controller 103 controls the transistor Q1 to turn off so that the protection switch 106 is turned off. Therefore, the first state detection terminal 104 is disconnected from the first positive terminal 101, that is, the second state detection terminal 21 is not energized. The first switch 22 and the second switch 23 are not conducting. Therefore, the third switch 24 and the fourth switch 25 are not conducting. The power module 1 is not energized, that is, the second controller 203 and the sampling circuit 205 are not energized. The power tool 200 cannot be started. When the power-on module 2 malfunctions in the battery pack 100, it can directly relay the information to the power tool 200, which will immediately lose power. This achieves protection without requiring the power tool 200 to detect the status of the battery pack 100, thus preventing additional power loss from the battery pack 100 and preventing unnecessary discharge or even damage to the battery pack 100.

[0030] If the first controller 103 detects that the battery pack 100 is not abnormal, the first controller 103 controls the transistor Q1 to conduct, thereby turning on the protection switch 106. Therefore, the first state detection terminal 104 is connected to the first positive terminal 101, and the second state detection terminal 21 can obtain the battery pack voltage through the first state detection terminal 104. The second state detection terminal 21, resistor R1, resistor R2, and ground form a circuit. The voltage is regulated across resistor R2 by the Zener diode ZD1, creating a voltage difference between the source and gate of the first switch 22, turning on the first switch 22. Furthermore, if the trigger 206 is pressed, the battery pack is activated. When the second switch 23 is turned on, the second positive terminal 201 and the second switch 23 are energized. The base of the third switch 24 is connected to the second positive terminal 201, and the third switch 24 is turned on. Subsequently, the fourth switch 25 is turned on, and the emitter of the fourth switch 25 is connected to the second positive terminal 201. The transistor Q2 and the voltage regulator chip are turned on. At this time, the first voltage regulator circuit regulates the battery pack voltage to 15V output, and the second voltage regulator circuit 26 regulates the voltage of the first voltage regulator circuit to 5V output. The second controller 203 detects that the trigger 206 is closed and controls the drive module 204 to drive the motor. The trigger 206 is located between the power module 1 and the power-on module 2. The power tool 200 will only be powered on when the battery pack 100 is normal and the trigger 206 is pressed, avoiding unnecessary battery pack 100 wear and saving energy.

[0031] Please see Figure 3 The diagram shown is a circuit diagram of a discharge system according to a second embodiment of the present invention. The battery pack 100' includes: a battery cell, a first positive terminal 101', a first negative terminal 102', a first controller 103', a first state detection terminal 104' connected to the first controller 103', and a temperature sensor 105'. The first controller 103' detects data such as the voltage of each battery cell and the temperature of the temperature sensor 105'. The first state detection terminal 104' is connected to the output port of the first controller 103'. The first controller 103' detects the state of the battery pack 100'. If the battery pack 100' is determined to be normal based on the voltage of each battery cell and the temperature of the battery pack 100', the first controller 103' outputs a high level through the first state detection terminal 104', which is 5V in this embodiment; if the battery pack 100' is abnormal, the first controller 103' outputs a low level through the first state detection terminal 104', which is 0V in this embodiment.

[0032] The power tool 200 has the same structure as the first embodiment. The specific discharge process includes: plugging the battery pack 100' into the power tool 200, connecting the first positive terminal 101' to the second positive terminal 201, connecting the first negative terminal 102' to the second negative terminal 202, powering on the battery pack 100', and determining whether the voltage of each cell of the battery pack 100' is overcharged or over-discharged through the first controller 103', and detecting whether the battery pack 100' is overheated through the temperature sensor 105'. If an abnormality occurs, the first controller 103' outputs a low level through the first state detection terminal 104', that is, the second state detection terminal 21 is not powered, the first switch 22 and the second switch 23 are not conducting, therefore, the third switch 24 and the fourth switch 25 are not conducting, the power module 1 is not powered, that is, the second controller 203 and the sampling circuit 205 are not powered, and the power tool 200 cannot be started. When the power-on module 2 malfunctions in the battery pack 100', it can directly trigger a response to the power tool 200, which will immediately lose power. This eliminates the need for the power tool 200 to detect the status of the battery pack 100', thus protecting the battery pack 100' from additional power loss and preventing unnecessary discharge or even damage.

[0033] If the first controller 103' detects that the battery pack 100' is not abnormal, the first controller 103' outputs a high level through the first state detection terminal 104', that is, there is voltage at the second state detection terminal 21. The second state detection terminal 21, resistor R1, resistor R2, and ground form a circuit. The voltage is regulated across resistor R2 by Zener diode ZD1, so that a voltage difference is formed between the source and gate of the first switch 22, and the first switch 22 is turned on. If the trigger 206 is pressed, the second switch 23 is turned on, and the second positive terminal 201, the... When the second switch 23 is energized, the base of the third switch 24 is connected to the second positive terminal 201, and the third switch 24 conducts. Subsequently, the fourth switch 25 conducts, and the emitter of the fourth switch 25 is connected to the second positive terminal 201. The transistor Q2 and the voltage regulator chip are also turned on. At this time, the first voltage regulator circuit regulates the battery pack voltage to a 15V output, and the second voltage regulator circuit 26 regulates the voltage of the first voltage regulator circuit to a 5V output. The second controller 203 detects that the trigger 206 is closed and controls the drive module 204 to drive the motor. The trigger 206 is located between the power module 1 and the power-on module 2. The power tool 200 will only be powered on when the battery pack 100 is functioning normally and the trigger 206 is pressed, avoiding unnecessary battery pack 100 wear and saving energy.

[0034] The power tool 200 of the present invention includes a second controller 203, a power module 1 for supplying power to the second controller 203, and a power-on module 2 connected to the power module 1. When the battery pack 100 is plugged into the power tool 200, the power-on module 2 is connected to the first state detection terminal 104 of the battery pack 100. The first state detection terminal 104 controls the on / off state of the power-on module 2 according to the state of the battery pack 100, so as to control whether the power tool 200 is powered on. The state detection terminal of the battery pack 100 is directly connected to the power-on module 2 of the power tool 200, so that when the battery pack 100 is abnormal, the power-on module 2 can be controlled to not be powered, that is, the tool is not powered, which can provide timely abnormal protection and the battery pack 100 will not be damaged after the abnormality.

[0035] This invention is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many other alternatives to the power tools and discharge system of this invention can be found without departing from the principles and scope of the invention. The scope of protection of this invention is defined by the claims.

Claims

1. A discharge system comprising a battery pack and a power tool, wherein, The battery pack includes: a first positive terminal, a first negative terminal, a first controller, and a first state detection terminal connected to the first controller; the power tool includes a second positive terminal and a second negative terminal; the second positive terminal and the second negative terminal are electrically in contact with the first positive terminal and the first negative terminal of the battery pack, respectively; characterized in that: The power tool further includes: a second controller, a power module for supplying power to the second controller, and a power-on module connected to the power module. The power-on module is connected to the first status detection terminal when the battery pack is plugged into the power tool. The first status detection terminal controls the on / off state of the power-on module according to the status of the battery pack, so as to control whether the power tool is powered on. The power-on module includes a second state detection terminal connected to the first state detection terminal, the second state detection terminal connected to a first switch, the first switch connected to a second switch, and the second switch connected to the second positive terminal and the power module. The power module includes a switching circuit and a voltage regulator circuit connected to the switching circuit. The switching circuit includes a third switch and a fourth switch, and the third switch is connected to the second switch and the fourth switch. When the battery pack is in an abnormal state, the first controller outputs a signal to the second state detection terminal through the first state detection terminal, so that the second state detection terminal is de-energized, thereby controlling the first switch and the second switch to turn off, and also turning off the third switch and the fourth switch, so that the power tool stops being powered on.

2. The discharge system according to claim 1, characterized in that: The switching circuit includes a third switch and a fourth switch. The base of the third switch is connected to the second switch. The collector of the third switch is connected to the emitter of the fourth switch. The base of the fourth switch is also connected to the second positive terminal. The collector of the fourth switch is connected to the voltage regulator circuit.

3. The discharge system according to claim 1, characterized in that: The power tool includes a trigger, which is disposed on the second positive terminal and located between the power module and the power-on module.

4. The discharge system according to claim 1, characterized in that: The first state detection terminal is connected to the first positive terminal, and the first state detection terminal includes a protection switch connected to the first controller.

5. The discharge system according to claim 1, characterized in that: The first state detection terminal is connected to the output port of the first controller.

6. A power tool detachably connected to a battery pack, the power tool comprising: A second positive terminal electrically connected to the first positive terminal of the battery pack, and a second negative terminal electrically connected to the first negative terminal of the battery pack; Its features are: The power tool further includes a second controller, a power module for supplying power to the second controller, and a power-on module connected to the power module. The power-on module controls the on / off state of the power pack to control whether the power tool is powered on. The power-on module includes a second state detection terminal connected to the first state detection terminal, the second state detection terminal connected to the first switch, the first switch connected to the second switch, and the second switch connected to the second positive terminal and the power module. The power module includes a switching circuit, which includes a third switch and a fourth switch, with the third switch connected to the second and fourth switches. When the battery pack is in an abnormal state, the second state detection terminal receives a signal output by the first controller of the battery pack through the first state detection terminal, and responds to the signal by not energizing the power supply, thereby controlling the first and second switches to open, the third and fourth switches to open, so that the power tool is not powered.

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