CN111952528A

CN111952528A - Hand-held electric tool and battery pack and charging seat thereof

Info

Publication number: CN111952528A
Application number: CN202010958078.XA
Authority: CN
Inventors: 刘自国
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2020-11-17

Abstract

The invention discloses a battery component of a handheld electric tool, which comprises at least two battery units and a plurality of first connecting ports, wherein the at least two battery units are sequentially connected; the positive electrode port and the negative electrode port are the head end and the tail end of the battery unit which are connected in sequence, the battery detection port is used for detecting the charge and discharge parameters of the battery unit by an electric tool or a charger, and the charge and discharge of the battery assembly are controlled according to the detected charge and discharge parameters. The invention also discloses a handheld electric tool and a charging seat. The invention structurally improves the battery assembly of the hand-held electric tool, and realizes that the charger and the hand-held electric tool realize the monitoring of the battery parameters in the working process of the battery assembly only through the plurality of connecting ports, thereby greatly reducing the cost of a charging and discharging system of the hand-held electric tool, ensuring the charging safety and prolonging the service life of the battery assembly.

Description

Hand-held electric tool and battery pack and charging seat thereof

Technical Field

The invention relates to the technical field of electric equipment, in particular to a handheld electric tool and a battery pack and a charging seat thereof.

Background

Hand-held power tools, as the name implies, are power tools that operate by being held or suspended by hand, and are commonly used in construction, such as electric drills, wrenches, electric saws, electric hammers, and the like. The rechargeable battery is arranged in the electric tool to provide power for the motor of the electric tool, so that the motor is controlled to rotate, and construction is carried out on a construction object.

Due to the portable characteristic of the electric tool, great convenience is brought to constructors. However, in order to meet the use requirements of the electric tool, the conventional electric tool needs to be provided with two battery packs and one charger, so that the cost is high, and the service life of the battery packs is short.

Disclosure of Invention

The invention mainly aims to provide a handheld electric tool, a battery assembly and a charging seat thereof, aiming at reducing the charging and discharging cost in the prior art and prolonging the service life of a battery pack.

In order to achieve the above object, the present invention provides a battery assembly of a handheld electric tool, including at least two battery units connected in sequence, and a plurality of first connection ports, where the first connection ports include a positive electrode port, a negative electrode port, and a battery detection port; the positive electrode port and the negative electrode port are the head end and the tail end of the battery unit which are connected in sequence, the battery detection port is used for detecting the charge and discharge parameters of the battery unit by an electric tool or a charger, and the charge and discharge of the battery assembly are controlled according to the detected charge and discharge parameters.

In an embodiment of the present invention, the battery detection port includes at least one voltage detection port, and the voltage detection port is led out from a connection node of an adjacent battery unit, and is used for detecting a voltage parameter of the battery unit.

In an embodiment of the present invention, the battery assembly further includes a temperature sensor disposed on the battery unit, for collecting a temperature parameter of the battery unit; the battery detection port further comprises a temperature detection port, and the temperature detection port is led out from the output end of the temperature sensor.

In addition, the embodiment of the invention also provides a charging seat of the battery component, which is used for charging the battery component of the hand-held electric tool; the charging seat comprises a third connecting port correspondingly connected with the first connecting port of the battery component and a charging control panel connected with the third connecting port; the first connection port comprises a positive electrode port, a negative electrode port and a battery detection port; and the charging control panel detects the battery parameters of the battery units in the battery assembly through the connected first connecting port and the third connecting port, and performs charging control on the battery assembly according to the detected battery parameters.

In an embodiment of the present invention, the charging control board includes:

the battery parameter detection circuit is correspondingly connected with the first connection port of the battery assembly through the third connection port and is used for detecting the battery parameters of the battery assembly in the charging process; the battery parameters include: a voltage parameter, a current parameter, and/or a temperature parameter;

and the charging control circuit is connected with the battery parameter detection circuit and is used for controlling the charging of the battery assembly according to the battery parameters detected by the battery parameter detection circuit.

In an embodiment of the present invention, the charging control circuit is configured to generate a conduction control signal after determining that the battery unit is fully charged according to the detected voltage parameter;

the charging control board further includes:

the equalizing charge unit corresponds to the battery unit of the battery assembly; and the two ends of each equalizing charge unit are connected with the two ends of the corresponding battery unit, and each equalizing charge unit carries out charging isolation on the fully charged battery unit according to the conduction control signal of the charging control circuit.

In addition, the embodiment of the invention also provides a charging seat, wherein the charging seat is connected with the charging head, and the charging head is used for providing a charging power supply required by the battery pack and charging the battery pack of the hand-held electric tool; the charging seat comprises a third connecting port correspondingly connected with the first connecting port of the battery component and a charging protection board connected with the third connecting port; the protection board charges includes:

the input end of the over-temperature protection circuit is connected with the power supply conversion circuit, the output end of the over-temperature protection circuit is connected with a connection port of the battery assembly, the control end of the over-temperature protection circuit is connected with a temperature sensor arranged on the battery assembly, and charging of the battery assembly is conducted or disconnected according to the temperature of the battery assembly in the charging process; and/or

And the two ends of the equalizing charge unit are correspondingly connected with the two ends of the battery unit of the battery assembly through the third connecting port, and when the full charge point of the battery unit is judged according to the voltages at the two ends of the battery unit, the fully charged battery unit is charged and isolated.

In addition, the embodiment of the invention also provides a handheld electric tool, which comprises a second connecting port connected with the first connecting port of the battery pack and a circuit control board, wherein the circuit control board detects battery parameters of a battery unit in the discharging process of the battery pack through the connected first connecting port and the second connecting port, and cuts off the power supply of the battery pack to the electric tool when the battery unit of the battery pack is abnormally discharged.

In an embodiment of the invention, the handheld electric tool further includes a fuse circuit, and the fuse circuit is disposed on a connection line between the negative electrode port of the electric tool and the negative electrode port of the battery pack.

In an embodiment of the present invention, the circuit control board includes:

the battery parameter detection circuit detects battery parameters of the battery unit in the discharging process of the battery assembly through the second connection port and the first connection port; the battery parameters include voltage parameters, current parameters, and/or temperature parameters;

and the discharge control circuit is connected with the battery parameter detection circuit, and is used for disconnecting the power supply of the battery assembly to the electric tool when the abnormal discharge of the battery unit is determined according to the detected battery parameters.

Compared with the prior art, the handheld electric tool, the battery component and the charging seat thereof provided by the embodiment of the invention have the following technical effects:

(1) the battery component capable of circularly charging and discharging directly cancels a charging and discharging protection plate, and replaces a PCB or a plastic structural member which only comprises an interface conductive structural member with the charging and discharging function and a temperature detection port structural member. Because the original charge and discharge protection plate is cancelled, the manufacturing cost of the product is directly reduced. In addition, the manufacturability of the product is increased, the potential adverse risk caused by the existence of electronic devices is reduced, and meanwhile, the inspection is convenient even if the battery pack has abnormal operation.

(2) For the handheld electric tool, a temperature detection port and a voltage detection port corresponding to a battery unit of the battery pack are added under the existing condition, so that the discharge control of the battery pack is realized according to the collected temperature parameters and/or voltage parameters, and the possibility that the battery in the recyclable charge-discharge battery pack is damaged due to over-discharge or overheating is avoided.

(3) For the charger of the battery pack, a temperature detection port and a voltage detection port corresponding to the battery unit of the battery pack are added under the existing condition, so that the charging control of the charger on the battery pack is realized according to the collected temperature parameters and/or voltage parameters, the adverse risk caused by battery overcharge or battery overheating in the charging process is avoided, and the charging safety is ensured.

(4) For the charger of the battery pack, the charging circuit is arranged, so that not only can the battery units in the battery pack be uniformly charged, but also the charging voltage of the battery can be monitored in real time, after a certain battery unit is fully charged, the battery unit is isolated, other battery units which are not fully charged are continuously charged, and the effective charging of the battery pack is ensured.

(5) To battery pack's charger, still through setting up current detection circuit, through the monitoring to the charging and discharging current, produce PWM control signal, realize that the large capacity of battery charges, promote charge efficiency.

Drawings

FIG. 1 is a schematic diagram of a charging/discharging system of a hand-held power tool according to an exemplary embodiment of the present invention;

FIG. 2 is a diagram illustrating an exemplary configuration of the hand-held power tool of FIG. 1;

FIG. 3 is a diagram illustrating exemplary connection lines of the battery pack, the charger, and the connection port of the power tool according to the embodiment of the present invention;

FIG. 4 is a diagram illustrating a connection circuit of each battery unit in the battery assembly according to the embodiment of the present invention;

fig. 5 is a view showing a structural example of a battery pack according to an embodiment of the present invention;

fig. 6 is an exemplary view of the internal structure of the battery pack of fig. 5;

FIG. 7 is a diagram illustrating a structure of a charging dock according to an embodiment of the present invention;

fig. 8 is a diagram illustrating a structure of functional modules of a charging system in a charging cradle according to an embodiment of the present invention;

FIG. 9 is a circuit diagram of an embodiment of a portion of functional blocks of the charging system of FIG. 8;

FIG. 10 is a circuit diagram of an embodiment of a portion of functional blocks of the charging system of FIG. 8;

FIG. 11 is a diagram illustrating a circuit structure of a charging cradle according to another embodiment of the present invention;

fig. 12 is a circuit configuration example diagram of a charging head according to an embodiment of the present invention;

fig. 13 is a diagram showing a structural example of a functional module of the discharge control board in the electric power tool according to the embodiment of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, the hand-held power tool charging and discharging system includes a power tool 100 for performing a construction operation on a construction object, a rechargeable and dischargeable battery pack 200, and a charger 300. The charger 300 provides a charging power source for the battery assembly, after the battery assembly 200 is fully charged, the battery assembly 200 is placed in the electric tool 100, and the battery assembly 200 provides power sources for elements such as a motor in the electric tool 100 according to control of a power switch on the electric tool 100, so that normal operation of the electric tool 100 is realized.

Referring to fig. 2, taking an electric drill as an example, the electric power tool 100 includes a main body 101 and a hand-held portion 102, wherein the main body 101 may be provided with a motor 103 for driving the drill to rotate and a control circuit board 104 for controlling the motor 103, the hand-held portion 102 is provided with a battery cavity (not shown) for accommodating the battery assembly 200, and when the battery assembly 200 is placed in the battery cavity according to a correct placement manner, the battery assembly 200 will be electrically connected to the control circuit board 104, so as to provide power for various components in the electric power tool 100. For example, the control circuit board 104 controls the operation of the motor 103 by the power supplied from the battery assembly 200.

The battery assembly 200 includes, for example, a plurality of batteries, which may be independently disposed, or may form a battery pack, for example, 3, 4, 5 or more batteries are combined together through a connection structure, and the plurality of batteries may be electrically connected in series or in parallel. If the battery pack is in the form of a battery pack, a charge/discharge management circuit board is further provided at an end of the battery pack, and the charge/discharge management circuit board is provided with detection circuits such as a voltage detection circuit and a current detection circuit, and a charge/discharge control circuit, and the charge/discharge voltage and the current of each battery in the battery pack 200 are acquired by the detection circuits such as the voltage detection circuit and the current detection circuit, and the use state of each battery is analyzed based on the charge/discharge voltage and the current, and the charge/discharge control circuit controls the charge/discharge of the battery in the battery pack 200 based on the use state of each battery. In the above-mentioned electric tool charge and discharge system, since the battery pack 200 needs to be provided with the charge and discharge management circuit board to control the charge and discharge of the battery, and the charge and discharge management circuit board needs to be provided with the charge and discharge transistor MOSFET, the control chip and some peripheral circuits, the cost of the battery pack 200 is greatly increased. In addition, when the charging and discharging management circuit board is abnormal in work and even damaged, the overhauling difficulty is high, and the battery assembly 200 cannot be recycled.

In contrast, in the embodiment of the present invention, the battery assembly 200 is improved, and the charging and discharging management circuit board is not required to be disposed, but the plurality of electrical connection structures disposed on the battery assembly 200 are electrically connected to the corresponding electrical connection structures in the charger 300 or the electric tool 100, so that the charger 300 or the electric tool 100 can detect the charging and discharging parameters of the battery unit in the battery assembly through the electrical connection with the battery assembly 200, and implement charging and discharging control according to the detected charging and discharging parameters of the battery.

Referring to fig. 3 and 4 in combination, the battery assembly 200 includes a plurality of battery cells, which are connected in series in sequence. Each battery unit may include at least one battery, and if a plurality of batteries are included, the batteries in the battery unit are connected in parallel. The battery assembly 200 further includes a plurality of electrical connection ports 21, such as a battery detection port (e.g., a voltage detection port 21b, a temperature detection port 21d, etc.), a positive port 21a, and a negative port 21 c. The positive electrode port 21a and the negative electrode port 21c are the head and tail ends of the battery units connected in sequence, and are used for input/output of charging and discharging. The battery detection port is electrically connected to the detection port of the charger 300 or the electric tool 100, so that the charger 300 or the electric tool 100 detects the charging and discharging parameters of the battery unit in the battery assembly 200 according to the battery detection port, and controls the charging and discharging of the battery assembly 200 according to the detected charging and discharging parameters.

In one embodiment, the battery detection port includes at least one voltage detection port 21b, and the voltage detection port 21b is led out from a connection node between adjacent battery units and is used for detecting a voltage parameter of the battery unit. Therefore, the number of the voltage detection ports 21b is 1 smaller than the number of the battery cells in the battery assembly 200, for example, the number of the battery cells in the battery assembly 200 is 5, and the number of the corresponding voltage detection ports 21b is 4.

Further, the battery assembly 200 further includes a temperature sensor 22 disposed on the battery unit for collecting temperature parameters of the battery unit in the battery assembly 200. The battery detection port further includes a temperature detection port 21d, which is led out from an output end of the temperature sensor 22. The charger or the electric tool obtains the battery temperature parameter of the battery unit through the detection of the temperature detection port 21d, and controls the charging and discharging according to the detected battery temperature parameter. The battery voltage parameter and the battery temperature parameter may be used for control of charge and discharge, respectively, or may be used for control of charge and discharge in combination.

Correspondingly, the electric power tool 100 and the charger 300 are also provided with connection ports corresponding to the electrical connection ports 21 of the battery pack 200. For convenience of description, the electrical connection port of the battery pack 200 is referred to as a first connection port 21, the connection port of the electric power tool 100 is referred to as a second connection port 11, and the connection port of the charger 300 is referred to as a third connection port 31. When the battery pack 200 is placed on the charger 300 for charging, the first connection port 21 of the battery pack 200 and the third connection port 31 of the charger 300 are electrically connected in a one-to-one correspondence manner, so that the charger 300 charges the battery pack 200. When the battery pack 200 is mounted on the electric tool 100, the first connection port 21 of the battery pack 200 and the second connection port 11 of the electric tool 100 are electrically connected in a one-to-one correspondence manner, so that the battery pack 200 provides power for the electric tool 100. Meanwhile, the charger 300 and the electric tool 100 also detect the charging and discharging parameters of the battery unit in the battery assembly 200 through the connection port, and control charging and discharging according to the detected charging and discharging parameters, so as to ensure the charging and discharging safety and performance.

Further, with reference to fig. 4, taking the number of the battery units as 5 as an example, in the connection lines of the battery units of the battery assembly 200, the positive electrode of the battery unit 1 and the negative electrode of the battery unit 2 are connected together to serve as the first voltage detection port of the battery assembly 200; the positive electrode of the battery unit 2 and the negative electrode of the battery unit 3 are connected together as a second voltage detection port of the battery assembly 200; the positive electrode of the battery unit 3 and the negative electrode of the battery unit 4 are connected together as a third voltage detection port of the battery assembly 200; the positive electrode of the battery unit 4 and the negative electrode of the battery unit 5 are connected together as a fourth voltage detection port of the battery assembly 200; the positive electrode of the battery cell 5 serves as the positive electrode port 21a, and the negative electrode of the battery cell 1 serves as the negative electrode port 21c of the battery assembly 200. The positive output terminal of the two output terminals of the temperature sensor 22 serves as the temperature detection port 21d of the battery assembly 200, and the negative output terminal is connected to the negative electrode of the battery unit 1 to serve as the negative electrode port 21 c. In one embodiment, the temperature sensor 22 is, for example, an NTC temperature sensor, and the output of the temperature sensor is a resistance value corresponding to the detected temperature value.

Referring to fig. 5 and 6 in combination, the battery assembly 200 further includes an outer case 23, an inner frame 24, and a plurality of battery cells 25 housed side by side in the inner frame 24. Wherein the inner frame 24 is provided inside the outer case 23, and includes end portions 241 wrapping both ends of the battery, and a connection portion 242 connecting the end portions 241. A plurality of conductive connectors 26 are disposed on the outer side of the battery end 241 for electrically connecting the corresponding batteries and then electrically connecting the corresponding batteries to the data port through a wire. The connecting portion 242 is used to connect at least a part of the end portion 241, and a plurality of first connecting terminals 27 are further provided on the connecting portion 242. The first connecting terminal comprises a positive terminal, a negative terminal and a battery detection terminal, wherein the battery detection terminal comprises a voltage detection terminal and a temperature detection terminal.

Further, the first connection terminal 27 is used as a connection structure of the battery pack 200 and the electric power tool 100 and the charger 300, one end of the first connection terminal 27 is electrically connected to the connection port 21, and the other end of the first connection terminal 27 is exposed out of the outer casing 23 for electrically contacting with the charger 300 or the electric power tool 100. The first connection terminal 27 may include a contact structure or a structure of an elastic clip. For example, the end of the first connection terminal 27 of the voltage detection port 21b is a contact structure, and the ends of the first connection terminal 27 corresponding to the temperature detection port 21d, the positive electrode port 21a, and the negative electrode port 21c are elastic clips.

Further, the above-described electrical connection sheets between the batteries are routed according to the battery connection lines shown in fig. 6. Since the battery pack shown in fig. 5 includes 5 battery cells, and each battery cell includes 2 batteries arranged side by side, the batteries in the upper and lower rows are connected in parallel by the vertical electrical connection sheet 261, and then the battery cells adjacent to each other on the left and right sides are connected in series by the horizontal electrical connection sheet 262.

It should be noted that the structure of the battery pack 200 in the embodiment of the present invention is not limited to the above-exemplified battery pack structure, and in practical use, a different number of battery cells may be provided as needed, and reasonable changes and modifications may be made with reference to the above-exemplified battery pack structure.

Further, the outer housing 22 is further provided with a protrusion 28 for accommodating the first connection terminal 27, and the protrusion 28 is provided with an avoiding opening for exposing the first connection terminal 27, so that the battery assembly 200 is placed on the charger 300, and the first connection terminal 27 of the battery assembly 200 is electrically contacted with a corresponding contact component on the charger 300; alternatively, when mounted in the power tool 100, the first connection terminal 27 of the battery pack 200 is electrically contacted with a corresponding contact member on the power tool 100.

Further, referring to fig. 7, the charging cradle of the charger 300 may be configured to receive DC power and provide the necessary charging power to the battery pack. The charging stand may include a charging stand body 301 and a battery slot 302 formed on the charging stand body 301. A third connection terminal is disposed in the charging base 301, and one end of the third connection terminal is exposed to the battery container 302 to form a charging contact 303, so that when the battery assembly is placed in the battery container 302, the third connection terminal is electrically contacted with the first connection terminal on the battery assembly 200, and thus the first connection port of the battery assembly 200 is correspondingly connected with the third connection port on the charger 300. The charging contact 303 as the third connection port includes a plurality of voltage detection ports, a positive electrode port, a negative electrode port, and a temperature detection port.

Referring to fig. 8, a charging system of the battery assembly is further disposed in the charging base 301, and the charging system includes a battery parameter detection circuit, a power conversion circuit 37, a charging circuit 35, and a charging control circuit 36. One end of the battery parameter detection circuit is connected with the third connection terminal, and the other end of the battery parameter detection circuit is connected with the charging control circuit 36, so as to detect the battery parameters of the battery assembly in the charging process, and transmit the detected battery parameters to the charging control circuit 36. The charging control circuit 36 controls the power conversion circuit 37 according to the detected battery parameter, so as to perform charging control on the battery assembly 200. The input end of the power conversion circuit 37 is used for connecting the commercial power, and the output end of the power conversion circuit 37 is connected with the charging circuit 35, and is used for converting the received direct current DC power into the charging power required by the battery assembly. The input end of the charging circuit 35 is connected to the output end of the power conversion circuit 37, the control end of the charging circuit 35 is connected to the charging control circuit 36, and the charging voltage required by the battery pack is provided according to the control of the charging control circuit 36.

Further, the battery parameter detecting circuit includes a voltage detecting circuit 32, one end of the voltage detecting circuit 32 is used as a voltage detecting port of the charger 300, and is electrically connected to the voltage detecting port 21b, the positive port 21a and the negative port 21c of the battery pack 200, and the other end of the voltage detecting circuit 32 is electrically connected to the charging control circuit 36, and is configured to detect and obtain a voltage parameter of each battery cell during the charging process of the battery pack, and transmit the detected voltage parameter to the charging control circuit 36.

Further, the battery parameter detection circuit further includes: and a current detection circuit 34, one end of the current detection circuit 34 serving as a current detection port of the charger 300 is connected with the positive electrode port 21a of the battery pack 200, and the other end is connected with the charging control circuit 36, and is used for detecting and obtaining the charging current of the battery unit in the charging process of the battery pack and transmitting the detected current parameter to the charging control circuit 36.

Further, the battery parameter detection circuit further includes: and one end of the temperature detection circuit 33, serving as a temperature detection port of the charger 300, is electrically connected to the temperature detection port 21d of the battery pack 200, and the other end of the temperature detection circuit 33 is electrically connected to the charging control circuit 36, and is configured to detect and obtain a temperature parameter of the battery cell during the charging process of the battery pack, and transmit the detected temperature parameter to the charging control circuit 36.

The charging control circuit 36 performs comparison and determination based on the detected voltage parameter, current parameter and temperature parameter, and generates a corresponding control signal based on the processing result, so as to perform charging control on the charging circuit 35, such as on/off of charging, magnitude of charging voltage, charging time in different stages, and the like. The charging circuit 35 includes, for example, an electromagnetic switch and a switching transistor such as a MOSFET.

In this embodiment, when the battery cells of the battery assembly 200 are charged, the charging condition of each battery cell can be obtained through the detected voltage parameter, for example, whether the battery cell is fully charged or not, and if the battery cell is fully charged, the battery cell is isolated from the fully charged battery cell, so that the battery cell is stopped being charged. Meanwhile, the current condition of the battery unit can be monitored through the detected current parameters, and the current is controlled, so that large-current charging is realized, and the damage to the battery caused by overlarge current is avoided. Through the detected temperature parameter, the temperature condition of the battery unit during the charging process can be monitored, for example, if the temperature is greater than or equal to a preset temperature value, the charging of the battery assembly 200 is stopped. Therefore, the embodiment of the invention not only realizes the safe charging of the battery pack, but also greatly reduces the cost of the battery pack.

Further, as shown in fig. 9, the charging circuit 35 includes a voltage conversion unit 351 and a plurality of equalizing charge units. The voltage converting unit 351 includes an input terminal as the DC input terminal DC _ IN connected to the output terminal of the power converting circuit 37, and an output terminal connected to the positive terminal 21a of the battery pack. The voltage conversion unit 351 receives a DC power through an input terminal, converts a voltage of the DC power into a charging voltage required by a battery cell of the battery pack 200, and outputs the charging voltage to the battery pack 200 through an output terminal; the plurality of equalizing charge units are used for controlling equalizing charge of each battery unit in the battery assembly 200, for example, when the battery unit is fully charged, the fully charged battery unit is isolated, so that overcharge of the battery can be prevented, and the service life of the battery can be prolonged.

Specifically, the voltage conversion unit 351 includes a first voltage converter U1, a first voltage regulator tube D1, a first inductor L1, a second voltage regulator tube D2, a first capacitor C1, a second capacitor C2 and a third capacitor C3, a third pin 3 of the first voltage converter U1 is connected to the DC input terminal DC _ IN, a second pin 2 is connected to one end of the first inductor L1 and a negative electrode of the first voltage regulator tube D1, the other end of the first inductor L2 is connected to a positive electrode of the second voltage regulator tube D2 and a positive electrode of the first capacitor C1, a negative electrode of the second voltage regulator tube D2 is connected to one end of the second capacitor C2 and the third capacitor C3, and the positive electrode of the first voltage regulator tube D1, the negative electrode of the first capacitor C1, the other end of the second capacitor C2 and the other end of the third capacitor C3 are all grounded. The negative electrode of the second regulator tube D2 is connected to the equalizing charge unit and the positive electrode port 21a of the battery pack 200 as the output terminal of the voltage conversion unit 351.

The plurality of equalizing charge units are sequentially connected, and the first equalizing charge unit is connected to the output end of the voltage converting unit 351. And the two ends of each equalizing charge unit are correspondingly connected with the two ends of the battery unit. Taking the two battery cells shown in fig. 8 as an example, the two equalizing charge cells, i.e., the first equalizing charge cell 352a and the second equalizing charge cell 352b, correspond to each other.

Taking the first equalizing charge unit 352a as an example, the equalizing charge unit includes a third resistor R3, a first switch Q1, a fourth resistor R4, a first diode D3, and a first light emitting diode D4, emitters of the third resistor R3 and the first switch Q1 are connected to an anode of the first battery unit BT1, the other end of the third resistor R3 is connected to a base of the first switch Q1, a collector of the first switch Q1 is connected to an anode of the first diode D3 and one end of the fourth resistor R4, respectively, the other end of the fourth resistor R4 is connected to an anode of the first light emitting diode D4, and a cathode of the first diode D3 and a cathode of the first light emitting diode D4 are connected to an anode of the first battery unit 2. When the base of the first switch Q1 in the equalizing charge unit receives the turn-on control signal output by the charge control circuit 36, the first switch Q1 is turned on, and at this time, the first battery BT1 will be isolated, and the first battery BT1 will not be charged any more. In addition, since the first switch Q1 is turned on, the first light emitting diode D4 will be lit, indicating that the first battery cell BT1 is fully charged.

Further, referring to fig. 8 and 9 in combination, the voltage detection circuit 32 includes a first voltage detection unit 321 and a plurality of second voltage detection units 322, wherein the first voltage detection unit 321 is used for detecting the output voltage of the voltage conversion unit 351, i.e. detecting the total voltage of all the battery cells in the battery assembly 200. The second voltage detection unit 322 is used to detect the voltage of other battery cells except the first battery cell. The voltages detected by the first voltage detection unit 321 and the second voltage detection unit 322 can determine the voltages of all the battery units, so as to control the equalizing charge unit to perform charging isolation on the fully charged battery units, and then stop charging the fully charged battery units, thereby preventing the battery from being overcharged, and further prolonging the service life of the battery assembly.

Specifically, the first voltage detecting unit 321 includes a first resistor R1, a second resistor R2, and a fourth capacitor C4. After the first resistor R1 and the second resistor R2 are connected in series, one end of the first resistor R1 is connected with the negative electrode of the second voltage regulator tube D2, and the other end of the first resistor R2 is grounded; a connection node of the first resistor R1 and the second resistor R2 serves as an output terminal of the first voltage detection unit 321 for connection to the charge control circuit 36. The output voltage of the voltage conversion unit 351 is divided by the first resistor R1 and the second resistor R2 and then output to the charge control circuit 36. In addition, the connection node of the first resistor R1 and the second resistor R2 is further connected with one end of a fourth capacitor C4, the other end of the fourth capacitor C4 is grounded, and the fourth capacitor C4 plays a role in filtering and resisting interference. The total voltage of all the battery cells is detected by the first voltage detecting unit 321.

The second voltage detecting unit 322 includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a fifth capacitor C5. After the sixth resistor R6 and the seventh resistor R7 are connected in series, one end of the sixth resistor R6 is connected with the anode of the second battery unit BT2, and the other end of the sixth resistor R7 is grounded; a connection node of the sixth resistor R6 and the seventh resistor R7 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is used as an output end of the second voltage detection unit 322 and is connected to the charge control circuit 36. The voltage of the second battery cell BT2 is divided by the sixth resistor R6 and the seventh resistor R7, and then output to the charge control circuit through the eighth resistor R8. In addition, the connection node of the sixth resistor R6 and the seventh resistor R7 is also connected with one end of a fifth capacitor C5, the other end of the fifth capacitor C5 is grounded, and the fifth capacitor C5 plays a role in filtering and resisting interference. The voltage of the corresponding second battery cell is detected by the second voltage detecting unit 322, thereby determining whether the battery cell is fully charged.

After receiving the voltage signals detected by the first voltage detection unit 321 and the second voltage detection unit 322, the charging control circuit 36 may determine the voltage of the first battery cell and the voltage of each of the remaining second battery cells in the battery assembly 200, so that after the battery cells are fully charged, a conduction control signal is generated, so that the equalizing charging unit corresponding to the battery cell performs charging isolation on the battery cell, thereby stopping charging the battery cell, thereby preventing overcharge of the battery, and further prolonging the service life of the battery assembly.

It is understood that the first voltage detection unit 321 may also be configured with the same circuit structure as the second voltage detection unit 322, and two ends of the first voltage detection unit 321 are connected to two ends of the first battery unit BT1 for detecting the voltage of the first battery unit BT1, so as to realize the charging control of the first battery unit BT 1. By adding the detected voltages of all the battery cells, the total voltage of all the battery cells can be obtained.

In addition, since fig. 9 illustrates a circuit configuration of two battery cells, when the number of battery cells increases, the circuit configuration of the equalizing charge unit 352b and the second voltage detecting unit 322 may be added to the battery cells at both ends of the increased battery cells.

Further, with continued reference to fig. 9, the current detection circuit 34 includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R2, and a sixth capacitor C6. One end of a ninth resistor R9 is connected with the cathode of the second battery unit BT2, after the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12 are connected in parallel, one end of the ninth resistor R9 is connected with the cathode of the second battery unit BT2, the other end of the ninth resistor R11 is grounded, and the other end of the ninth resistor R9 is used as the output end of the current detection circuit 34 and is connected with the charging control circuit 36 to output the current in the charging process of the battery pack 200 to the charging control circuit 36. In addition, the other end of the ninth resistor R9 is also connected with one end of a sixth capacitor C6, the other end of the sixth capacitor C6 is grounded, and the sixth capacitor C6 plays a role in filtering and resisting disturbance. The charging control circuit 36 monitors the current of the battery assembly 200 during charging, thereby ensuring safe charging of the battery assembly 200.

Further, with reference to fig. 9, the charging circuit 35 further includes a voltage adjusting circuit 353, and the voltage adjusting circuit 353 includes a third switching tube Q3, a fourth switching tube Q4, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, and a third voltage regulator D7. The base of the third switch tube Q3 is connected to one end of a thirteenth resistor R13 and one end of a fourteenth resistor R14, respectively, the other end of the fourteenth resistor R14 is connected to ground and the emitter of the third switch tube Q3, respectively, and the other end of the thirteenth resistor R13 is used as an input end of a control signal and is connected to the charge control circuit 36.

The base electrode of the fourth switching tube Q4 is connected with one end of a fifteenth resistor R15 and the collector electrode of the third switching tube Q3 respectively, and the other end of the fifteenth resistor R15 is connected with the DC input terminal DC _ IN; the collector of the fourth switching tube Q4 is connected with the anode of the third voltage-regulator tube D7, and the cathode of the third voltage-regulator tube D7 is connected with the collector of the third switching tube Q3. The collector of the fourth switching transistor Q4 is connected to pin 3 of the first voltage converter U1, and the emitter of the fourth switching transistor Q4 is also connected to pin 1 of the first voltage converter U1.

The first voltage converter U1 is a switching circuit including a switching tube, and the PWM control signal (i.e. a square wave signal) provided by the charge control circuit 36 controls the on-time of the switching circuit via the third switching tube Q3 and the fourth switching tube Q4, thereby affecting the magnitude of the voltage and current output by the first voltage converter U1. Therefore, when the battery pack 200 is charged, the large-capacity charging of the battery can be realized by the PWM control signal provided by the charging control circuit 36, and the charging efficiency is improved.

Further, referring to fig. 10, the charging control circuit 36 includes a control chip U2, the control chip U2 includes a plurality of input/output ports, and a plurality of electronic components and circuits or programmable logic devices are integrated inside the control chip U2, so that the charging control of the battery pack is realized and the safe charging of the battery pack is ensured through the layout or program setting of the circuit components.

The power conversion circuit 37 includes a power connector J1, a fourth voltage regulator D8, an eighteenth resistor R18, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, and a second voltage converter U3. One end of a power supply connector J1 is connected with a Direct Current (DC) power supply, the other end of the power supply connector J1 is respectively connected with the negative electrode of a fourth voltage regulator tube D8, one end of a seventh capacitor C7, one end of an eighth capacitor C8 and a first pin 1 of a second voltage converter U3, and the positive electrode of the fourth voltage regulator tube D8, the other end of the seventh capacitor C7, the other end of the eighth capacitor C8 and a second pin 2 of the second voltage converter U3 are all grounded; a third pin 3 of the second voltage converter U3 is connected to one end of a ninth capacitor C9, one end of a tenth capacitor C10, one end of an eleventh capacitor C11, one end of a twelfth capacitor C12, and one end of an eighteenth resistor R18, respectively, and the other end of the ninth capacitor C9, the other end of the tenth capacitor C10, the other end of the eleventh capacitor C11, and the other end of the twelfth capacitor C12 are all grounded; the other end of the eighteenth resistor R18 is connected to the power supply terminal VCC of the control chip U2, while the other end of the eighteenth resistor R18 is also connected to one end of the thirteenth capacitor C13, and the other end of the thirteenth capacitor C13 is grounded.

The power supply required by the control chip U2 is generated by converting the direct current DC power supply through the power supply conversion circuit 37, meanwhile, the stability of the input power supply is ensured through the voltage stabilizing effect of the fourth voltage stabilizing tube D8, a plurality of capacitors are additionally arranged to play a role in filtering and interference prevention, the eighteenth resistor R18 plays a role in current limiting, and the phenomenon that the chip is damaged due to overlarge current input to the control chip U2 is avoided.

It is to be understood that the circuit configurations of the components of the charging system are only for illustration, and those skilled in the art can make reasonable changes according to actual situations, such as addition, subtraction, replacement, and the like of electronic components.

Further, with reference to fig. 10, one end of the temperature detection circuit 33 is connected to the temperature detection port of the battery assembly 200 through a port, the other end of the temperature detection circuit 33 is connected to the charging control circuit 36, that is, one port of the control chip U2, the control chip U2 determines whether the collected temperature is greater than or equal to a preset temperature threshold, and when the collected temperature is greater than or equal to the preset temperature threshold, the battery assembly is stopped to be charged, that is, the control signal is output at the pin 13 of the control chip U2, and the voltage output to the battery assembly 200 is stopped.

The temperature detecting circuit 33 is, for example, a sixteenth resistor R16 as a sampling resistor, and the temperature sensor in the battery pack 200 is an NTC resistor R17 as a seventeenth resistor. One end of the sixteenth resistor R16 is connected to the pin 3 of the second voltage converter U3, the other end is connected to one end of the seventeenth resistor R17, and the other end of the seventeenth resistor R17 is grounded. Meanwhile, a connection node of the sixteenth resistor R16 and the seventeenth resistor R17 is connected to the pin 12 of the control chip U2 as the temperature detection port 21d of the battery pack 200.

Further, with reference to fig. 10, the power conversion circuit 37 further includes a power voltage collecting circuit, where the power voltage collecting circuit includes a nineteenth resistor R19 and a twentieth resistor R20, one end of the nineteenth resistor R19 is connected to the output end of the power connector J1, the other end of the nineteenth resistor R19 is connected to one end of the twentieth resistor R20, and the other end of the twentieth resistor R20 is grounded. Meanwhile, the connection node of the nineteenth resistor R19 and the twentieth resistor R20 is connected to the charge control circuit 36, i.e., to the pin 5 of the control chip U2. The power supply input voltage is collected through the voltage division effect of the tenth resistor R19 and the twentieth resistor R20, and the collected power supply input voltage is transmitted to a charging control circuit, namely a control chip U2. The control chip U2 determines whether the collected power input voltage is abnormal, for example, when the power input voltage suddenly increases due to an external power abnormality, a control signal is output at the pin 13 of the control chip U2, and the voltage output to the battery pack 200 is stopped.

Further, another embodiment of the charging cradle is provided in the embodiments of the present invention. The difference from the above embodiment is that, in the charging system in the charging stand of this embodiment, compared with the charging system shown in fig. 7, only the equalizing charging unit and/or the over-temperature protection circuit needs to be arranged to implement the equalizing charging and the over-temperature protection functions of the battery unit, and the rest of the circuits are arranged on the charging head, so that the charging head with the existing structure can be used to implement the charging of the battery assembly of this embodiment as long as the charging system has the overvoltage protection and the over-current protection functions.

Specifically, referring to fig. 11, a charging circuit structure provided on a charging stand is shown. The charging circuit 35' disposed on the charging stand includes an over-temperature protection circuit 354 and an equalizing charging unit. The over-temperature protection circuit 354 includes two input terminals and an output terminal, wherein one input terminal of the over-temperature protection circuit 354 is connected to the DC input terminal (i.e., the DC output terminal of the charging head), the other input terminal is connected to the output terminal of the temperature sensor, and the output terminal of the over-temperature protection circuit 354 is connected to the negative terminal port 21c of the battery assembly 200.

The equalizing charge unit corresponds battery pack's battery cell setting, includes a plurality ofly promptly, and these a plurality of equalizing charge units connect gradually, and the both ends of every equalizing charge unit still correspond and be connected with battery cell's both ends. Taking the two battery cells shown in fig. 11 as an example, there are two equalizing charge cells, i.e., the first equalizing charge cell 352a 'and the second equalizing charge cell 352 b'. The first equalizing charge unit 352a' is used to explain the structure and operation principle thereof.

The equalizing charge unit 352a' includes a twenty-first resistor R21, a fifth voltage regulator D9, a twenty-second resistor R22, a fifth switch Q5, and a third diode D10.

Specifically, the twenty-first resistor R21 is a voltage dividing resistor, and the fifth regulator D9 is a regulator. The twenty-first resistor R21 is connected with the positive and negative ends of the first battery unit BT1 in parallel, and the voltage-dividing end of the twenty-first resistor R21 is connected with the voltage-stabilizing end of the fifth voltage-stabilizing tube D9. One end of a twenty-second resistor R22 is connected with the negative electrode of the first battery unit BT1, the other end of the twenty-second resistor R22 is connected with the negative electrode of a fifth voltage-regulator tube D9, and the positive electrode of the fifth voltage-regulator tube D9 is connected with the positive electrode of the first battery unit BT 1. The base electrode of the fifth switching tube Q5 is connected with the negative electrode of the fifth voltage-regulator tube D9, the emitter electrode of the fifth switching tube Q5 is connected with the negative electrode of the first battery unit BT1, the collector electrode of the fifth switching tube Q5 is connected with the positive electrode of the third diode D10, the negative electrode of the third diode D10 is connected with the positive electrode of the first battery unit BT1, unidirectional conduction is achieved through the third diode D10, and current of the first battery unit BT1 is prevented from entering the fifth switching tube Q5.

The fifth voltage regulator tube D9 is a controllable precise voltage regulator structure, and the current charging voltage of the first battery cell BT1 is collected through the twenty-first resistor R21, and through the arrangement of the fifth voltage regulator tube D9 and the twenty-second resistor R22, when the voltage at the two ends of the first battery cell BT1 reaches a preset voltage threshold (i.e., full charge), the fifth switch tube Q5 is turned on, so as to isolate the first battery cell BT1, the charging power supply does not charge the first battery cell BT1 any more, and the rest of the battery cells are continuously charged, so that the battery overcharge can be prevented, and the service life of the battery pack price is further prolonged.

Furthermore, the equalizing charge unit 352a' further includes a twenty-third resistor R23, a third led D11, and a twenty-third resistor R23 connected in series with the third led D11 and then connected in parallel with the third diode D10. Through the arrangement of the third light emitting diode D11, when the first battery cell BT1 is fully charged, the fifth switching tube Q5 is turned on, and at this time, the third light emitting diode D11 is turned on due to the voltage across the two terminals reaching the requirement, which indicates that the first battery cell BT1 is fully charged.

Further, the over-temperature protection circuit 354 includes a seventh switch tube Q7, a seventh voltage regulator tube D15, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a drain of the seventh switch tube Q7 is connected to the DC input terminal (i.e., the DC output terminal of the charging head), a source of the seventh switch tube Q7 is connected to the negative port 21c of the battery assembly 200, a gate of the seventh switch tube Q7 is connected to the negative electrode of the seventh voltage regulator tube D15, and a positive electrode of the seventh voltage regulator tube D15 is grounded. Moreover, two ends of the twenty-eighth resistor R28 are connected to the drain and the gate of the seventh switching tube Q7, so as to protect the seventh switching tube Q7; and after the twenty-seventh resistor R27 and the twenty-ninth resistor R29 are connected in series, one end of the resistor is connected with the DC input end, the other end of the resistor is grounded, and a connecting node between the second seventh resistor R27 and the twenty-ninth resistor R29 is connected with the voltage stabilizing end of the seventh voltage stabilizing tube D15.

In the over-temperature protection circuit 354, the twenty-ninth resistor R29 is an NTC temperature-sensing resistor, and is located in the battery assembly 200 for detecting the temperature of the battery cells during the charging process. Due to the characteristics of the NTC temperature-sensing resistor, the higher the temperature is, the smaller the resistance value thereof is, so when the resistance value of the twenty-ninth resistor R29 is less than or equal to a certain value, the reverse voltage loaded on the seventh voltage-regulator tube D15 makes the seventh voltage-regulator tube D15 break down in the reverse direction, and at this time, the voltage of the seventh switch tube Q7 is reduced, so that the seventh switch tube Q7 is in a cut-off state, the connection between the DC input and the battery assembly 200 is cut off, and the charging of the battery assembly 200 is stopped. On the contrary, when the resistance of the twenty-ninth resistor R29 is smaller than a certain value, the seventh regulator D15 is not broken down, and the seventh switch Q7 is in a conducting state, so as to continuously charge the battery pack 200.

In this embodiment, the seventh voltage regulator tube D15 is a controllable precision voltage regulator structure, and the parameters of the twenty-seventh resistor R27, the twenty-ninth resistor R29, and the seventh voltage regulator tube D15 are selected so that when the temperature of the battery unit in the charging process is greater than or equal to a preset temperature threshold value, the seventh voltage regulator tube D15 is turned off, the charging of the battery assembly 200 is stopped, and the charging protection of the battery assembly 200 in an over-temperature state is realized.

As shown in fig. 12, a circuit structure of a charging head in the prior art is shown, in which a power conversion circuit, a charging control circuit, a voltage detection circuit, and a current detection circuit are disposed on the charging head to implement a function of converting AC power to DC power, and an overvoltage protection function and an overcurrent protection function. So, charging seat cooperation in this embodiment is current the head that charges (the head that charges of selecting matching voltage according to battery pack's demand), can realize charging battery pack, has realized the reuse of the head that charges, has saved the cost of charging.

The power tool 100 according to an embodiment of the present invention may include a battery chamber for receiving the battery pack, and a plurality of second connection terminals connected to the connection ports of the battery pack are disposed in the battery chamber. Referring to fig. 13, the circuit control board of the electric power tool includes a battery parameter detection circuit connected to the second connection terminal of the battery chamber, a power supply circuit 15, and a discharge control circuit 16. One end of the battery parameter detection circuit is connected with the second connecting terminal, and the other end of the battery parameter detection circuit is connected with the discharge control circuit 16 and used for detecting the battery parameters of the battery assembly in the discharge process and transmitting the detected battery parameters to the discharge control circuit 16. The discharge control circuit 16 controls the power supply circuit 15 to perform discharge control of the battery assembly 200, that is, to control the power supply circuit to turn on/off the output to the electric power tool, based on the detected battery parameter. The input end of the power circuit 15 is used as the positive terminal of the electric tool 100 and is electrically connected to the positive terminal of the battery assembly 200, and the output end of the power circuit 15 is electrically connected to the motor 103 of the electric tool 100 and is used for generating the working power required by the electric tool. In addition, the control terminal of the power circuit 15 is electrically connected to the discharge control circuit 16.

Further, the battery parameter detecting circuit includes a voltage detecting circuit 12, one end of the voltage detecting circuit 12 is used as a voltage detecting port of the power tool 100, and is electrically connected to the voltage detecting port of the battery pack 200 and the positive electrode port 21a, and the other end of the voltage detecting circuit 12 is electrically connected to the discharge control circuit 16, and is configured to detect and obtain a voltage parameter of each battery cell during the discharge process of the battery pack, and transmit the detected voltage parameter to the discharge control circuit 16.

Further, the battery parameter detection circuit includes a current detection circuit 14, one end of the current detection circuit 14 is connected to the negative terminal 21c of the battery assembly 200, and the other end is connected to the discharge control circuit 16, and is configured to detect and obtain a discharge current of the battery cell during the discharge process of the battery assembly 200, and transmit the detected current parameter to the discharge control circuit 16.

Further, the battery parameter detection circuit includes a temperature detection circuit 13, one end of the temperature detection circuit 13 is used as a temperature detection port of the power tool 100 and is electrically connected to the temperature detection port 21d of the battery pack 200, and the other end of the temperature detection circuit 13 is electrically connected to the discharge control circuit 16, and is used for detecting and obtaining a temperature parameter of the battery unit during the discharge process of the battery pack and transmitting the detected temperature parameter to the discharge control circuit 16.

The discharge control circuit 16 performs a judgment based on the detected battery voltage, discharge current and/or temperature, and generates a corresponding control signal based on the judgment result, which is transmitted to the power supply circuit 15 to control on/off of the power supply circuit 15. The on/off control of the power supply circuit 15 described above may be realized by an electromagnetic switch or a switching transistor, such as a MOSFET.

Further, the voltage detection circuit 12 is connected to, for example, the positive terminal of the battery assembly 200 to acquire the total voltage of all the battery cells in the battery assembly 200; the voltage detection port of the battery assembly can be connected to correspondingly acquire the voltage of each battery unit. The discharging control circuit 16 compares the detected voltage with a preset voltage threshold, and when the detected voltage is lower than the preset voltage threshold, it indicates that the battery assembly 200 is low in power, and may generate a low power indication, and generate a "turn-off" control signal to the power circuit 15 to control the power circuit 15 to turn off. The configuration of the battery voltage detection circuit 12 described above may be such as the circuit configuration of the voltage detection unit in the charger 300.

The current detection circuit 14 is connected to, for example, a negative terminal of the battery pack 200 to collect a discharge current of the battery pack 200 during operation, and the discharge control circuit 16 compares the detected discharge current with a preset current threshold, and when the detected discharge current exceeds the preset current threshold, indicating that the battery pack 200 is in an abnormal operation, generates a "shutdown" control signal to the power supply circuit 15 to disconnect the electric power tool 100 from the battery pack 200. The structure of the current detection circuit 14 may be the circuit structure of the current detection circuit 34 in the charger 300.

The temperature detection circuit 13 is connected to a temperature detection port of the battery assembly 200, for example, to obtain a current temperature value collected by the temperature sensor 22 in the battery assembly 200. The discharge control circuit 16 compares the current temperature value with a preset temperature value, and if the current temperature value is greater than or equal to the preset temperature value, generates a turn-off control signal to the power circuit 15 to turn off the power circuit 15. In one embodiment, the temperature sensor 22 is an NTC temperature sensor, and the output of the temperature sensor is a resistance value corresponding to the detected temperature value.

Further, referring to fig. 3, the hand-held electric tool further includes a fuse circuit, and the fuse circuit is disposed between the negative electrode port of the electric tool and the negative electrode port of the battery pack, so as to protect the electric tool when the battery pack is abnormally discharged. Specifically, the fuse circuit is arranged on a connecting line between the negative terminal of the battery pack and the negative terminal of the electric tool, namely, one end of the fuse circuit is connected with the negative port of the electric tool, and the other end of the fuse circuit is connected with the grounding end of the circuit control board.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes several instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, a controlled terminal, or a network device) to execute the method according to the embodiments of the present invention.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A battery pack of a handheld electric tool is characterized by comprising at least two battery units which are sequentially connected and a plurality of first connection ports, wherein the first connection ports comprise a positive electrode port, a negative electrode port and a battery detection port; the positive electrode port and the negative electrode port are the head end and the tail end of the battery unit which are connected in sequence, the battery detection port is used for detecting the charge and discharge parameters of the battery unit by an electric tool or a charger, and the charge and discharge of the battery assembly are controlled according to the detected charge and discharge parameters.

2. The battery pack of claim 1, wherein the battery test ports comprise at least one voltage test port leading from a connection node of an adjacent battery cell for performing a test of a voltage parameter of the battery cell.

3. The battery assembly of claim 1, further comprising a temperature sensor disposed on the battery cell for collecting temperature parameters of the battery cell; the battery detection port further comprises a temperature detection port, and the temperature detection port is led out from the output end of the temperature sensor.

4. A charging seat of a battery pack is characterized by being used for charging the battery pack of a hand-held electric tool; the charging seat comprises a third connecting port correspondingly connected with the first connecting port of the battery component and a charging control panel connected with the third connecting port; the first connection port comprises a positive electrode port, a negative electrode port and a battery detection port; and the charging control panel detects the battery parameters of the battery units in the battery assembly through the connected first connecting port and the third connecting port, and performs charging control on the battery assembly according to the detected battery parameters.

5. The charging cradle of claim 4, wherein the charging control board comprises:

6. The charging dock of claim 5, wherein the charging control circuit is configured to generate the conduction control signal after determining that the battery cell is fully charged according to the detected voltage parameter;

the charging control board further includes:

7. A charging seat of a battery pack is characterized in that the charging seat is connected with a charging head, and the charging head is used for providing a charging power supply required by a battery pack and charging the battery pack of a hand-held electric tool; the charging seat comprises a third connecting port correspondingly connected with the first connecting port of the battery component and a charging protection board connected with the third connecting port; the protection board charges includes:

8. A handheld electric tool is characterized by comprising a second connecting port connected with a first connecting port of a battery pack and a circuit control board, wherein the circuit control board detects battery parameters of a battery unit in the discharging process of the battery pack through the connected first connecting port and the second connecting port and cuts off power supply of the battery pack to the electric tool when the battery unit of the battery pack is abnormally discharged.

9. The hand-held power tool of claim 8, further comprising a fuse circuit disposed on a connection line between the negative port of the power tool and the negative port of the battery pack.

10. The hand-held power tool of claim 8, wherein the circuit control board comprises: