PD battery pack assembly of electric tool

Abstract

The utility model discloses a PD battery pack assembly of an electric tool, which comprises a PD battery pack and a replaceable interface module, the PD battery pack comprises a casing, a main circuit board and a battery cell, the main circuit board comprises two battery pack contacts, an upper casing of the casing comprises a connecting groove corresponding to the battery pack contacts, and the battery pack contacts are arranged right below the connecting groove; the replaceable interface module comprises a switching box and a switching circuit board, the upper shell comprises two sliding grooves arranged in the longitudinal direction, the switching box comprises two sliding edges, and the two sliding edges of the switching box are inserted into the two sliding grooves; the switching circuit board comprises two knife-shaped connectors, and the lower portions of the knife-shaped connectors penetrate through a bottom plate of the switching box to be inserted into the machine shell from a connecting groove of the upper shell and connected with a battery pack contact. The top plate of the switching box comprises a plurality of slots, the switching circuit board comprises switching contacts corresponding to the slots, and the switching contacts are arranged on the inner sides of the corresponding slots. According to the utility model, different electric tools or chargers can be compatible by replacing the interface module, so that the use cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a PD battery pack, especially an electric tool's PD battery pack assembly. BACKGROUND

[0002] The PD battery pack in the electric tool usually refers to the ternary lithium battery pack, and the PD battery pack usually comprises the following components: battery cell: ternary lithium battery unit; battery management system (BMS): monitoring the battery state, preventing overcharge, overdischarge and short circuit; shell: protecting the internal components from external damage; connector: ensuring the reliable connection of the electric tool.

[0003] The utility model discloses an electric tool battery pack, including upper shell, bottom shell, electric core support no. 1, electric core support no. 2, end cover, BMS board, electric core and busbar, electric core support no. 1, electric core support no. 2 are respectively sleeved in the both ends of electric core, and two end covers are sleeved in electric core support no. 1, electric core support no. 2 respectively, and the busbar is electrically connected to the electrode of electric core and is arranged between electric core support no. 1, electric core support no. 2 and end cover, and the BMS board is electrically connected to the busbar and is provided with contact, and the upper shell and bottom shell are relatively clamped and are arranged on the outer surface of two end covers. The utility model discloses the protection shell of electric core from inside to outside is electric core support no. 1, electric core support no. 2, end cover, upper shell and bottom shell in proper order, and multiple electric cores are fixed from different directions. The electric core, electric core support and busbar constitute an integral whole, avoiding the falling of busbar and electric core during use. The utility model charges and discharges through the contact and the PD battery pack connecting groove 21 of electric tool, and the structure and size of connecting groove 21 are determined, so that charging and discharging can only be one-to-one. The charger must be matched with the type of battery pack connecting groove 21 to charge the battery pack, and the electric tool must be matched with the type of battery pack connecting groove 21 to use electricity. The utilization rate of charger and battery pack is not high. SUMMARY

[0004] The utility model provides a kind of PD battery pack assembly that can adapt to multiple chargers or electric tools.

[0005] In order to solve the above technical problems, the utility model adopts the technical scheme, a PD battery pack assembly of electric tool, including PD battery pack and replaceable interface module, PD battery pack includes casing, main circuit board and electric core, main circuit board and electric core are arranged in casing, the top surface of main circuit board includes two battery pack contacts, the casing includes upper shell, the upper shell includes the interface slot corresponding with the battery pack contact, and the battery pack contact is arranged directly below the corresponding interface slot, the replaceable interface module includes adapter box and adapter circuit board, and the adapter circuit board is arranged in the adapter box, the upper shell of casing includes two longitudinal and one end opening sliding grooves, the bottom surface of adapter box includes two longitudinal sliding edges, and the two sliding edges of adapter box are inserted into the two sliding grooves of upper shell respectively, the adapter circuit board includes two longitudinal and corresponding with the battery pack contact knife-shaped connectors, the lower part of knife-shaped connector passes through the bottom plate of adapter box, and the lower part of knife-shaped connector is inserted into casing from the interface slot of upper shell and is connected with the corresponding battery pack contact, the top plate of adapter box includes multiple insertion slots, and the adapter circuit board includes adapter contacts corresponding with the insertion slot, and the adapter contact is arranged on the inner side of corresponding insertion slot.

[0006] The PD battery pack assembly described above, the sliding groove is an L-shaped sliding groove, and the sliding edge is an L-shaped sliding edge; the replaceable interface module includes a circuit board support, the adapter circuit board is fixed in the adapter box through the circuit board support, and the battery pack contact is a U-shaped contact.

[0007] The PD battery pack assembly described above, the adapter circuit board includes an identification circuit, the identification circuit includes a first voltage dividing resistor, a second voltage dividing resistor, a first filter capacitor and a second filter capacitor, the multiple adapter contacts include a positive power supply contact, a negative power supply contact, a battery pack battery state detection contact and a voltage dividing contact; the battery pack battery state detection contact is grounded through the first voltage dividing resistor, and the voltage dividing contact is grounded through the second voltage dividing resistor; the first filter capacitor is connected with the first voltage dividing resistor, and the second filter capacitor is connected with the second voltage dividing resistor; the two battery pack contacts are a battery positive contact and a battery negative contact respectively; the positive power supply contact is connected with the battery positive contact through the first knife-shaped connector, and the negative power supply contact is connected with the battery negative contact through the second knife-shaped connector.

[0008] The PD battery pack assembly described above, the PD battery pack includes a main circuit, the main circuit includes a battery management system module and an output interface, and the battery management system module and the output interface are arranged on the main circuit board; a first input and output end of the battery management system module is connected with the electric core, and a second input and output end of the battery management system module is connected with the output interface; the output interface includes the multiple battery pack contacts.

[0009] The PD battery pack assembly described above, the main circuit includes MCU, USB battery charging management module and USB hub module, USB output interface and USB input / output interface, the MCU, USB battery charging management module and USB hub module are arranged on the main circuit board, and the USB output interface and the USB input / output interface are arranged on the side surface of the shell; the USB battery charging management module and the USB hub module are in communication connection with the MCU, the first input / output end of the USB battery charging management module is connected with the third input / output end of the battery management system module, and the second input / output end of the USB battery charging management module is connected with the USB input / output interface; the input end of the USB hub module is connected with the output end of the battery management system module, and the output end of the USB hub module is connected with the USB output interface.

[0010] The PD battery pack assembly described above, the main circuit includes power viewing button and power indication circuit, the power indication circuit includes input end and a plurality of LED indicator lights, the power viewing button and the plurality of LED indicator lights are arranged on the side surface of the shell, and the output end of the power viewing button and the input end of the power indication circuit are connected with the MCU respectively.

[0011] The PD battery pack assembly described above, the top of the replaceable interface module adapter box includes a buckle and a button for opening the buckle.

[0012] The PD battery pack of the electric tool can realize compatibility with different electric tools or chargers by replacing the interface module, and the use cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0013] The utility model will be further explained in detail in combination with the drawings and specific embodiment.

[0014] Figure 1 It is the perspective view of the PD battery pack assembly of the utility model embodiment.

[0015] Figure 2 It is the perspective view of the PD battery pack of the utility model embodiment.

[0016] Figure 3 It is the perspective view of the replaceable interface module of the utility model embodiment.

[0017] Figure 4 It is the front view of the PD battery pack assembly of the utility model embodiment.

[0018] Figure 5 It is the plan view of the PD battery pack assembly of the utility model embodiment.

[0019] Figure 6 It is the front view of the replaceable interface module of the utility model embodiment.

[0020] Figure 7 is Figure 4 an A-A sectional view in

[0021] Figure 8 is Figure 4 a B-B sectional view in

[0022] Figure 9 is a circuit block diagram of the PD battery pack main circuit of the embodiment of the utility model.

[0023] Figure 10 is a circuit diagram of the identification circuit of the embodiment of the utility model.

[0024] Figure 11 is a circuit diagram of the PD battery pack electric quantity indication circuit of the embodiment of the utility model. DETAILED DESCRIPTION

[0025] The structure and principle of the PD battery pack assembly of the embodiment of the utility model electric tool are as shown in Figures 1 to 11 , comprising a PD battery pack 100 and a replaceable interface module 200.

[0026] The PD battery pack 100 comprises a casing 10, a main circuit board 20 and an electric core 30, and the main circuit board 20 and the electric core 30 are arranged in the casing 10. The electric core model adopts high energy density 21700, and the top surface of the main circuit board 20 comprises two U-shaped battery pack contacts 21. The casing 10 comprises an upper shell 10A, and the upper shell 10A is provided with an open-ended interface groove 11 corresponding to the battery pack contacts 21 and arranged along the longitudinal direction (X direction), and the two battery pack contacts 21 are arranged immediately below the corresponding interface groove 11.

[0027] The replaceable interface module 200 comprises a switching box 40 and a switching circuit board 50, and the switching circuit board 50 is arranged in the switching box 40 and supported by a circuit board support 41. The upper shell 10A comprises two L-shaped sliding grooves 12 arranged along the longitudinal direction (X direction) and having one end open, and the bottom surface of the switching box 40 comprises two L-shaped sliding edges 41 arranged along the longitudinal direction. The two L-shaped sliding edges 41 of the switching box 40 are respectively inserted into the two L-shaped sliding grooves 12 of the upper shell 10A.

[0028] The switching circuit board 50 comprises two knife-shaped connectors 52 (hardware connectors J1 in Figure 10 ) arranged along the longitudinal direction and corresponding to the battery pack contacts 21. The lower part of the knife-shaped connector 52 penetrates the bottom plate 42 of the switching box 40, and the lower part of the knife-shaped connector 52 is inserted into the casing 10 from the interface groove 11 of the upper shell 10A and connected with the corresponding battery pack contact 21. The top part 43 of the switching box 40 comprises four insertion grooves 44, and the switching circuit board 50 comprises four switching contacts (not marked in the figure) corresponding to the insertion grooves 44, and the four switching contacts are arranged on the inner side of the corresponding insertion grooves 44.

[0029] As Figure 10 shown, the adapter circuit board 50 includes an identification circuit, which includes a first voltage dividing resistor R14, a second voltage dividing resistor R13, a first filter capacitor C8 and a second filter capacitor C7. The resistance values of the first voltage dividing resistor R14 and the second voltage dividing resistor R13 correspond to the type of battery pack. The four adapter contacts include a power positive contact BAT+, a power negative contact P-, a battery pack battery status detection contact BS, and a voltage dividing contact TV. The battery pack battery status detection contact BS is grounded through the first voltage dividing resistor R14, and the voltage dividing contact TV is grounded through the second voltage dividing resistor R13. The first filter capacitor C8 is connected in parallel with the first voltage dividing resistor R14, and the second filter capacitor C7 is connected in parallel with the second voltage dividing resistor R13. The four battery pack contacts 21 include a battery positive contact, a battery negative contact, a battery pack battery status contact, and a temperature contact. The power positive contact BAT+ is connected to the battery positive contact through the first blade contact 52, and the power negative contact P- is connected to the battery negative contact through the second blade contact 52.

[0030] The interface of the power tool has three terminals, which are the power positive terminal, the negative terminal, and the TV terminal. When the power tool is inserted, the power is connected, and after the switch button of the power tool is pressed, the power is turned on. The internal circuit of the power tool is divided by the second voltage dividing resistor R13. A detection voltage of about 4.2V is formed on the voltage dividing contact TV. The power tool will only work within the set range. If the voltage is higher or lower than the preset value, the MCU inside the power tool detects that the voltage is not normal. The power tool will stop working, and the power tool will enter the protection state. If the temperature of the power tool is normal, the switch button is always on, and the power tool will always work until the battery power is low, and the power tool detects the (BAT+, P-) low voltage protection shutdown.

[0031] The interface of the charger has four terminals, which are the power positive terminal, the negative terminal, the TV terminal, and the BS terminal. When the charger is connected to the battery pack through the replaceable interface module 200, the internal circuit of the charger is divided by the second voltage dividing resistor R13. A detection voltage of about 2.6V is formed on the detection contact TV, and the charger is divided by the first voltage dividing resistor R14. A detection voltage of about 3.5V is formed on the detection contact BS. The charger will only work within the set range of these two voltages. If the voltage is higher or lower than the preset value, the MCU inside the charger detects that the two voltages are not normal. The charger will stop working, indicating that the battery pack model is incorrect and cannot be normally charged. If the MCU inside the charger detects that the two voltages are normal, the charger can normally charge until the charging is complete.

[0032] The top of the replaceable interface module 200 adapter box 40 has two charger or power tool mounting slots 45. The top of the replaceable interface module 200 adapter box 40 includes buckles 46 for securing the charger or power tool and a buckle opening button 47. The mounting slots 45, buckles 46 and buckle opening button 47 facilitate the mounting and dismounting of the charger or power tool. As Figure 7 As shown in FIG. 1, the PD battery pack 100 includes a main circuit including a battery management system module (CM1351-DTA), an MCU (FT61F145-TRB), a USB battery charging management module (TYPE-CSW6301), a USB hub module (USB-AMG3905SP6812), an output interface, a USB (USB-A) output interface, a USB (TYPE-C) input / output interface, a power checking button and a power indication circuit.

[0033] The battery management system module, the output interface, the USB battery charging management module and the USB hub module are arranged on the main circuit board 20. The USB output interface 15 and the USB input / output interface 16 are arranged on the side of the casing 10.

[0034] The first input / output end of the battery management system module is connected with the battery cell 30, and the second input / output end of the battery management system module is connected with the output interface. The output interface includes four battery pack contacts 21.

[0035] The USB battery charging management module and the USB hub module are in communication connection with the MCU, the first input / output end of the USB battery charging management module is connected with the third input / output end of the battery management system module, and the second input / output end of the USB battery charging management module is connected with the USB input / output interface. The input end of the USB hub module is connected with the output end of the battery management system module, and the output end of the USB hub module is connected with the USB output interface.

[0036] As shown in FIG. 1, the power indication circuit includes four input ends and four LED indicator lights, as shown in FIG. 1. Figure 10 Figure 2 The power checking button 17 and the four LED indicator lights 18 are arranged on the side of the casing 10, for displaying the charging / discharging state of the battery pack and the power information. The output end of the power checking button 17 is connected with the MCU. As shown in FIG. 1, the four input ends of the power indication circuit are respectively connected with the four power indication signal output ends of the MCU. Figure 10

[0037] The FT61F145-TRB chip of the MCU control circuit is responsible for receiving data from various sensors and communication of various chips, and making decisions according to preset algorithms and strategies to control other circuits to work.

[0038] ​​Lithium battery management system module (BMS) is used for monitoring battery state, protecting battery from overcharge, overdischarge, short circuit damage. USBPD protocol fast charging chip is responsible for negotiating charging parameters with charging equipment, realizing fast charging; it can also charge USBPD equipment such as mobile phones and computers, realizing one machine with multiple functions.

[0039] The lithium battery management system module (BMS) is composed of CM1351-DTA and peripheral components, and has a built-in high-precision voltage detection circuit and current detection circuit. Through detecting the voltage, charging and discharging current and temperature of each battery, the functions of overcharge, overdischarge, broken line, low voltage prohibition, discharge overcurrent, short circuit, charging overcurrent and overtemperature protection are realized. At the same time, it is responsible for monitoring and managing the battery state, ensuring the safe operation of the battery cell. By continuously monitoring the key parameters of each single battery in the battery pack, the service life of the battery is prolonged.

[0040] The USB hub module (USBA power supply circuit) is composed of integrated high-efficiency synchronous step-down converter MT3905 and SP6812 protocol chip group USBA power supply; when the USB interface has a power device inserted, the signal is sent to the MCU; the MCU sends instructions to the MT3905 chip, and the MT3905 starts to work and outputs corresponding voltage and current.

[0041] The USB battery charging management module is a PD power control circuit, and the chip SW6301 is a high-integration multi-protocol step-up / down mobile power SOC, which supports UFCS / PPS / PD / SCP / FCP / QC / AFC / BC1.2 and various input / output fast charging protocols; integrated high-precision power meter; the circuit includes input filtering and output protection parts, which ensures the safety and stability of the charging and discharging process; the USB battery charging management module is provided with an LDO voltage stabilizing circuit for the MCU to provide stable power supply voltage; when a device is inserted into the TYPE-C port, SW6301 is awakened through data, and communicates with the charging equipment to negotiate voltage, current and power supply direction. It can dynamically adjust the charging / discharging power according to the equipment demand, realize fast and efficient charging / discharging.

[0042] The electric tool PD battery pack of the above embodiments of the utility model realizes compatibility with different electric tools by replacing the interface module, so that users do not need to purchase multiple battery packs for different brands of electric tools, and the use cost is reduced. At the same time, the fast charging technology also reduces the waiting time and improves the user experience. Since the battery pack can be compatible with electric tools of multiple brands and models, the problem that batteries of different brands of electric tools are not mutually used is solved, and more choices and convenience are provided for users.

Claims

1. A PD battery pack assembly of a power tool, comprising a PD battery pack, the PD battery pack comprising a housing, a main circuit board and a cell, the main circuit board and the cell being arranged in the housing; a top surface of the main circuit board comprising two battery pack contacts, the housing comprising an upper shell, the upper shell comprising two corresponding contact slots corresponding to the battery pack contacts, the battery pack contacts being arranged directly below the corresponding contact slots; characterized in that, The replaceable interface module comprises an adapter box and an adapter circuit board, and the adapter circuit board is arranged in the adapter box; The upper shell of the shell comprises two longitudinal open grooves, the bottom surface of the adapter box comprises two longitudinal slide edges, and the two slide edges of the adapter box are respectively inserted into the two grooves of the upper shell; the adapter circuit board comprises two longitudinal blade contacts corresponding to the battery pack contacts, the lower part of the blade contact passes through the bottom plate of the adapter box, and the lower part of the blade contact is inserted into the shell from the slot of the upper shell and connected with the corresponding battery pack contact; the top plate of the adapter box comprises a plurality of insertion slots, and the adapter circuit board comprises adapter contacts corresponding to the insertion slots, and the adapter contacts are arranged on the inner side of the corresponding insertion slots.

2. The PD battery pack assembly of claim 1, wherein, The grooves are L-shaped grooves, and the slide edges are L-shaped slide edges; the replaceable interface module comprises a circuit board support, the adapter circuit board is fixed in the adapter box through the circuit board support, and the battery pack contact is a U-shaped contact.

3. The PD battery pack assembly of claim 1, wherein, The adapter circuit board comprises an identification circuit, the identification circuit comprises a first voltage dividing resistor, a second voltage dividing resistor, a first filter capacitor and a second filter capacitor, the plurality of adapter contacts comprise a power positive contact, a power negative contact, a battery pack battery state detection contact and a voltage dividing contact; the battery pack battery state detection contact is grounded through the first voltage dividing resistor, and the voltage dividing contact is grounded through the second voltage dividing resistor; the first filter capacitor is connected with the first voltage dividing resistor, and the second filter capacitor is connected with the second voltage dividing resistor; the two battery pack contacts are a battery positive contact and a battery negative contact; the power positive contact is connected with the battery positive contact through the first blade contact, and the power negative contact is connected with the battery negative contact through the second blade contact.

4. The PD battery pack assembly of claim 1, wherein, The PD battery pack comprises a main circuit, the main circuit comprises a battery management system module and an output interface, and the battery management system module and the output interface are arranged on a main circuit board; a first input and output end of the battery management system module is connected with the battery cell, and a second input and output end of the battery management system module is connected with the output interface; the output interface comprises the two battery pack contacts.

5. The PD battery pack assembly of claim 4, wherein, The main circuit comprises an MCU, a USB battery charging management module and a USB hub module, a USB output interface and a USB input and output interface, the MCU, the USB battery charging management module and the USB hub module are arranged on the main circuit board, and the USB output interface and the USB input and output interface are arranged on the side surface of the shell; The USB battery charging management module and the USB hub module are respectively connected with the MCU in communication, a first input and output end of the USB battery charging management module is connected with a third input and output end of the battery management system module, and a second input and output end of the USB battery charging management module is connected with the USB input and output interface; An input end of the USB hub module is connected with an output end of the battery management system module, and an output end of the USB hub module is connected with the USB output interface.

6. The PD battery pack assembly of claim 5, wherein, The main circuit comprises a power checking button and a power indicating circuit, the power indicating circuit comprises an input end and a plurality of LED indicating lamps, the power checking button and the plurality of LED indicating lamps are arranged on the side of the shell, and the output end of the power checking button and the input end of the power indicating circuit are connected with the MCU respectively.

7. The PD battery pack assembly of claim 1, wherein, The top of the replaceable interface module adapter box comprises a buckle and a button for opening the buckle.

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