CN115799669A

CN115799669A - Battery pack and electric tool

Info

Publication number: CN115799669A
Application number: CN202210689468.0A
Authority: CN
Inventors: 许乃前
Original assignee: Zhejiang Qixiang Technology Co Ltd
Current assignee: Zhejiang Qixiang Technology Co Ltd
Priority date: 2021-09-10
Filing date: 2022-06-16
Publication date: 2023-03-14
Also published as: CN218568949U; CN219086045U; CN115799668A

Abstract

The present disclosure provides a battery pack and a power tool, the battery pack including a battery pack, a second circuit board assembly, and a first circuit board assembly. The second circuit board assembly comprises a second circuit board and a second device which are electrically connected, and the second circuit board at least partially covers the battery pack; the first circuit board assembly is used for realizing conversion between alternating current and direct current, the first circuit board assembly comprises a first circuit board and a first device which are electrically connected, the first circuit board is electrically connected with a second circuit board, the working voltage of the first device is larger than that of the second device, and the first circuit board and the second circuit board are arranged at intervals in the thickness direction to form an accommodating space. Wherein the at least one second component and/or the at least one first component are located in the receiving space. The battery pack disclosed by the invention has the advantages that the structure is more compact, and the space utilization rate is high; meanwhile, the second device and the first device are arranged at intervals to increase the creepage distance between the second device and the first device, so that the electromagnetic interference of the first device with high voltage to the second device with low voltage is reduced.

Description

Battery pack and electric tool

Technical Field

The present disclosure relates to the field of battery technologies, and in particular, to a battery pack and an electric tool.

Background

Since the battery pack charged by the charger is relatively poor in convenience, the battery pack cannot be charged without the charger. Thus, a battery pack, which is itself equipped with a charging plug that can be plugged into a mains outlet, and which does not need to be charged with a charger, reenters the public's field of view. The battery pack mainly comprises a shell, a battery pack and a circuit board assembly, wherein the shell is used for wrapping the battery pack and the circuit board assembly, so that the overall volume and the electric capacity of the battery pack are greatly influenced by the layout design of the battery pack and the circuit board assembly. Since the volume of the battery pack cannot be made too large, it is not easy to carry. Therefore, how to improve the structural compactness and the space utilization rate of the battery pack so as to improve the volume energy density of the battery pack is the key point of the design of the battery pack.

Meanwhile, charging directly by using the commercial power means that the circuit board assembly needs to be equipped with a second device (e.g., a chip, etc.) for managing charging and discharging of the battery cell and a first device (e.g., a transformer, a rectifier, etc.) for converting high-voltage alternating current into low-voltage direct current. However, the first device may generate a large electromagnetic interference to the second device during the charging and discharging processes, which is not beneficial to improving the service life of the battery pack. Therefore, in the design work of such battery packs, how to reduce electromagnetic interference while improving the space utilization rate becomes a research and development focus.

Disclosure of Invention

The present disclosure provides a battery pack and an electric tool, which can reduce electromagnetic interference while improving the effective space utilization.

The technical scheme is as follows:

according to a first aspect of embodiments of the present disclosure, there is provided a battery pack,

a battery pack;

the second circuit board assembly comprises a second circuit board and a second device electrically connected to the second circuit board, and the second circuit board at least partially covers the battery pack; and

the first circuit board assembly is used for realizing conversion between alternating current and direct current, and comprises a first circuit board and a first device electrically connected to the first circuit board, the first circuit board is electrically connected with the second circuit board, the working voltage of the first device is larger than that of the second device, and the first circuit board and the second circuit board are arranged at intervals in the thickness direction of the second circuit board.

Optionally, the area of the second circuit board is larger than that of the first circuit board, the second circuit board includes a first region and a second region that are connected to each other, the first region and the first circuit board are disposed opposite to each other to form the accommodating space, at least one first device and/or at least one second device is located in the accommodating space, the second region covers the battery pack, the first circuit board is electrically connected to the first region, and the first circuit board and the battery pack are arranged in a direction from the first region to the second region.

Optionally, at least part of the second device is mounted in the second area.

Optionally, the battery pack is spaced apart from at least part of the second device and/or the first device.

Optionally, the battery pack further includes a housing, a first charging portion and a first discharging portion, the battery pack, the second circuit board assembly and the first circuit board assembly are mounted inside the housing, the first charging portion is electrically connected to the first circuit board and at least partially exposed, and the first discharging portion is electrically connected to the second circuit board and at least partially exposed.

Optionally, the housing includes a first housing, a second housing and a middle frame having a receiving portion; the first shell and the second shell are detachably connected to the middle frame; the first charging part and the first discharging part are disposed in the middle frame, and the battery pack, the second circuit board assembly and the first circuit board assembly are mounted in the accommodating part of the middle frame.

Optionally, the battery pack further comprises a first clamping structure, the first clamping structure comprises a first clamping protrusion and a first clamping groove, one of the first clamping protrusion and the first clamping groove is arranged on the side wall of the first shell, the other one of the first clamping protrusion and the first clamping groove is arranged on the side wall of the second shell, and the first clamping protrusion and the first clamping groove are clamped and matched.

Optionally, the first clamping protrusion and the first clamping groove are both located in the accommodating portion of the middle frame; after the first clamping protrusion is in clamping fit with the first clamping groove, the middle frame is clamped between the first shell and the second shell.

Optionally, the inner side wall of the middle frame is provided with a limit groove matched with the first clamping protrusion.

Optionally, the middle frame is provided with a first opening, the first charging portion is movably connected to the middle frame and has a first state and a second state, the first charging portion is accommodated in the first opening when in the first state, and at least part of the first charging portion protrudes out of the first opening when in the second state.

Optionally, the battery pack further includes a second clamping structure, the second clamping structure includes a second clamping protrusion and a second clamping groove, one of the second clamping protrusion and the second clamping groove is disposed on the first housing, the other is disposed on the second housing, and the second housing are in clamping fit through the second clamping protrusion and the second clamping groove;

the second clamping structure is arranged between the first opening and the accommodating space.

Optionally, a first limiting portion is arranged on the first shell, a second limiting portion is arranged on the middle frame, and the first limiting portion and the second limiting portion are matched with each other to enable the first shell to be in limited fit with the middle frame.

Optionally, a third positioning portion is arranged on the middle frame, a fourth positioning portion is arranged on the second shell, and the third positioning portion and the fourth positioning portion are matched with each other to enable the middle frame to be installed on the second shell in a positioning mode.

Optionally, the battery pack includes a mounting bracket and a battery cell, the battery cell is mounted on the mounting bracket, and the second circuit board and/or the first circuit board is mounted on the mounting bracket; the mounting bracket is assembled to the middle frame.

Optionally, the mounting bracket includes a first mounting bracket and a second mounting bracket that are disposed opposite to each other, the second circuit board is mounted on the first mounting bracket and the second mounting bracket, the battery cell includes a positive terminal and a negative terminal, one of the positive terminal and the negative terminal is mounted on the first mounting bracket, and the other is mounted on the second mounting bracket.

Optionally, the battery pack further includes a display device, the display device is connected to the housing and is exposed, the display device is electrically connected to the second circuit board and/or the first circuit board, and the display device is configured to display operating parameters of the battery pack; and/or the battery pack further comprises a switch, the switch is electrically connected to the second circuit board and/or the first circuit board, and the switch is used for triggering the switching of the battery pack between an on state and an off state.

Optionally, the switch is mounted on the housing and exposed, the display device is mounted on the switch, and the display device and the accommodating space are arranged at intervals.

Optionally, the battery pack further includes a shielding member mounted to the housing or the first discharge portion, the shielding member being configured to shield the first discharge portion.

Optionally, the first discharge portion includes a discharge channel, the protection member is fixedly disposed in the discharge channel, and a deformation portion is disposed on the protection member and is used for automatically opening and closing the discharge channel.

Optionally, the battery pack further includes a second charging portion electrically connected to the second circuit board and at least partially exposed from the housing.

Optionally, the battery pack further includes a second discharge portion and/or a third discharge portion, and the second discharge portion and/or the third discharge portion are electrically connected to the second circuit board and at least partially exposed to the outside and disposed on the housing.

Optionally, the second device further includes a cell manager, where the cell manager is configured to convert an input voltage of the battery pack into a first target current and a second target current, where current values of the first target current and the second target current are different, the first target current is output from the first discharge portion, and the second target current is output from the second discharge portion and/or the third discharge portion.

Optionally, the outer side of the middle frame includes a first side, a second side, and a third side, the first side and the third side are disposed opposite to each other, the second side is connected to the first side and the third side, the first charging portion is located on the first side, the first discharging portion is located on the second side, at least a portion of the second discharging portion is located on the second side, and the second charging portion and the third discharging portion are located on the second side or the third side.

Optionally, the second device includes a temperature monitor electrically connected to the second circuit board and facing the battery pack, and the temperature monitor is configured to monitor a temperature of the battery pack.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

the second circuit board at least partially covers the battery pack and at least one second device and/or one first device is placed in an accommodating space formed by the second circuit board and the first circuit board in an interval mode, and a gap between the second circuit board and the first circuit board enables the structure of the battery pack to be more compact, waste of space is avoided, and space utilization rate can be improved; meanwhile, the second device and the first device are respectively arranged on the second circuit board and the first circuit board which are arranged at intervals and electrically connected, the second device and the first device with different working voltages are not integrated on one circuit board any more, so that the creepage distance between the second device and the first device is increased, and the electromagnetic interference of the first device with high voltage on the second device with low voltage is reduced. Therefore, the technical scheme of the disclosure can reduce electromagnetic interference while improving the utilization rate of the effective space.

According to a second aspect of an embodiment of the present disclosure, there is also provided an electric tool including the battery pack in any one of the embodiments.

because the space utilization rate of the battery pack applied to the electric tool is improved, the electromagnetic interference in the battery pack is weakened, and the energy density and the service life of the battery pack are improved, the electric tool using the battery pack can have longer working time and longer service life.

According to a third aspect of the embodiments of the present disclosure, there is also provided an assembling method of a battery pack, including the battery pack in any one of the embodiments; the assembly method comprises at least the following steps:

s1: mounting the second circuit board assembly to the battery pack;

s2: mounting a first circuit board and a first charging part on a middle frame having an accommodating part in which the first circuit board is mounted, and electrically connecting the first circuit board and the first charging part mounted on an outer surface of the accommodating part;

s3: mounting the battery pack into the receiving portion of the middle frame and electrically connecting the second circuit board assembly and the first circuit board assembly;

s4: providing a first housing and a second housing, connecting the first housing and the second housing together to secure the middle frame; wherein the middle frame is positioned between the first shell and the second shell.

Optionally, the step S1 further includes: providing a mounting bracket and a battery cell, and mounting the battery cell on the mounting bracket; providing a first nickel sheet and a second nickel sheet, welding one end of the first nickel sheet to the positive end of the battery cell and the other end of the first nickel sheet to the second circuit board assembly, and welding one end of the second nickel sheet to the negative end of the battery cell and the other end of the second nickel sheet to the second circuit board assembly;

and/or a light bar is injection-molded on the middle frame, and before the step S4, the assembling method further comprises the step S31: providing at least one of a switch, a second discharge part and a lamp strip circuit board, installing the switch and the second discharge part on the middle frame and exposing the switch and the second discharge part, and installing the lamp strip circuit board in the accommodating part of the middle frame and electrically connecting the lamp strip circuit board to the lamp strip.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

Description of the drawingsthe accompanying drawings, which form a part hereof, are provided to provide a further understanding of the disclosure, and are included to explain by way of illustration the disclosure and not to limit the disclosure.

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a battery pack according to an embodiment.

Fig. 2 is a circuit schematic of a battery pack according to some embodiments of the present disclosure.

Fig. 3 is a view taken along direction a in fig. 1.

Fig. 4 is a partial exploded view of fig. 1.

Fig. 5 is a schematic structural diagram of a battery pack according to another embodiment of the disclosure.

Fig. 6 is a partial exploded view of the battery pack shown in fig. 5.

Fig. 7 is a schematic structural diagram of a middle frame according to an embodiment of the present disclosure.

Fig. 8 is a schematic structural diagram of a second housing according to an embodiment of the disclosure.

Fig. 9 is a schematic structural diagram of a first housing according to an embodiment of the disclosure.

Fig. 10 is a schematic view of the connection of the first housing and the second housing.

Fig. 11 is a sectional view B-B of the housing shown in fig. 5.

Fig. 12 is an enlarged view of the area C in fig. 5.

Fig. 13 is a schematic cross-sectional view of a power tool according to an embodiment of the disclosure.

Fig. 14 is a schematic diagram illustrating charging of a battery pack according to an embodiment.

Fig. 15 is a schematic diagram illustrating charging of a battery pack according to another embodiment.

Fig. 16 is a schematic diagram illustrating charging of a battery pack according to another embodiment.

Fig. 17 is a schematic diagram illustrating charging of a battery pack according to yet another embodiment.

Description of the reference numerals:

1 battery pack, 1a accommodating space, 10 battery pack, 10a mounting bracket, 11 first mounting bracket, 111 first mounting groove, 12 second mounting bracket, 121 second mounting groove, 10b battery cell, 101 first mounting hole, 102 second mounting hole, 103 first positioning part, 13 first conductive part, 14 second conductive part, 20 second circuit board assembly, 21 second circuit board, 21a first region, 21b second region, 22 second device, 221 temperature monitor, 222 battery cell manager, 20a battery cell management module, 200a management chip, 200bMCU master control, 23PD template, 23a buck-boost integrated chip, 30 first circuit board assembly, 31 first circuit board, 32 first device, 31a rectifying-buck module, 40 shell, 41 first shell, 411 first limiting part, 42 second shell, 421 fourth positioners, 43 middle frames, 431 accommodating parts, 432 second positioners, 433 third positioners, 434 second limiting parts, 435 first side surfaces, 436 second side surfaces, 437 third side surfaces, 438 third mounting holes, 439 limiting grooves, 401 first openings, 402 second accommodating grooves, 51 first charging parts, 52 first discharging parts, 521 discharging channels, 53 second charging parts, 54 second discharging parts, 541 conducting wires, 542 connectors, 55 third discharging parts, 60 clamping structures, 61 first clamping protrusions, 62 first clamping grooves, 60a first clamping structures, 60b second clamping structures, 63 second clamping protrusions, 64 second clamping grooves, 71 display devices, 72 switches, 73 protection parts, 731 deformation parts, 2 electric tools, 200 clamping grooves, 3 data lines, 4 direct current chargers, and 5 direct current power supplies.

Detailed Description

For the purpose of making the purpose, technical solutions and advantages of the present disclosure more apparent, the present disclosure will be described in further detail below with reference to the accompanying drawings and detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the disclosure, are intended for purposes of illustration only and are not intended to limit the scope of the disclosure.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein in the description of the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.

In recent years, with the increasing dependence on electric tools and electronic devices, battery packs have become popular that can free normal operation of electric tools and electronic devices from positional restrictions of power plugs. The electric tool includes, but is not limited to, a garden tool, a vacuum cleaner, a hand-held electric saw, a hand-held electric drill, a dc air compressor, and other power equipment using a secondary battery as a power source. Therefore, a battery pack, which is provided with an electronic device capable of converting ac power into dc power and can be charged directly using an ac power outlet, has started to come into the field of vision of people.

However, because electronic devices capable of converting ac power into dc power are arranged inside the battery pack, the electronic devices include second devices that perform charging and discharging management on a battery cell (a primary battery or a current collector inside the primary battery) inside the battery pack and operate using dc power, such as a resistor, MCU master control, and the like; the device also comprises a transformer, a rectifier, a capacitor and other first devices for converting alternating current into direct current. The volume and operating voltage of the first device tends to be greater than the volume and voltage of the second device. In the process of charging the battery pack, the first device installed on the circuit board can generate stronger electromagnetic interference on the second device, so that the charging and discharging management functions of the second device on the battery cell are influenced, even the second device can be directly punctured under the severe condition, and the service life of the battery pack is further influenced. Meanwhile, because the volume of the battery pack is limited, the space utilization rate of the battery pack by the battery core needs to be improved as much as possible so as to improve the energy density of the battery pack. Paradoxically, improving the space utilization ratio of the battery pack by the battery cell means that the space for accommodating the second device and the first device becomes narrower, and the distance between the second device and the first device mounted on the circuit board is smaller, so that the creepage distance and the electrical gap between the second device and the first device become smaller, which will cause the conductive electromagnetic interference and the radiation electromagnetic interference of the first device to the second device to become more serious. Therefore, in the design work of such battery packs, how to reduce the electromagnetic interference while improving the effective space utilization rate becomes a research and development focus.

Based on this, the present disclosure provides a battery pack, which can reduce electromagnetic interference while improving the utilization rate of the effective space, that is, can reduce electromagnetic interference existing in the battery pack while improving the utilization rate of the battery cell to the internal space of the battery pack.

It should be noted that, the battery pack 1 provided by some embodiments of the present disclosure may be a battery pack 1 in which the battery pack 10 is wrapped inside the housing 40, and is convenient to carry or plug and unplug; instead of providing the housing 40, the battery pack 1 may be used by being mounted in a battery compartment of an electric device, such as the battery pack 1 shown in fig. 1.

Referring to fig. 1 to 2, a battery pack 1 according to an embodiment of the present disclosure includes a battery pack 10, a second circuit board assembly 20, and a first circuit board assembly 30; the second circuit board assembly 20 includes a second circuit board 21 and a second device 22 electrically connected to the second circuit board 21, and the second circuit board 21 at least partially covers the battery pack 10; the first circuit board assembly 30 is used for converting between alternating current and direct current, the first circuit board assembly 30 includes a first circuit board 31 and a first device 32 electrically connected to the first circuit board 31, the first circuit board 31 is electrically connected to the second circuit board 21, the operating voltage of the first device 32 is greater than the operating voltage of the second device 22, and the first circuit board 31 and the second circuit board 21 are arranged at intervals along the thickness direction of the second circuit board 21 to form a containing space 1a; wherein at least one second component 22 and/or at least one first component 32 is located in the receiving space 1a. Because the second circuit board 21 at least partially covers the battery pack 10 and the accommodating space 1a formed by arranging the at least one second device 22 and/or one first device 32 at intervals between the second circuit board 21 and the first circuit board 31, the gap between the second circuit board 21 and the first circuit board 31 is fully utilized, the structure of the battery pack 1 can be more compact, the waste of space is avoided, and the space utilization rate of the battery pack 10 can be improved; meanwhile, the second device 22 and the first device 32 are respectively installed on the second circuit board 21 and the first circuit board 31 which are arranged at intervals and electrically connected, the second device 22 and the first device 32 with different working voltages are not installed on one circuit board any more, the creepage distance between the second device 22 and the first device 32 is increased, and the electromagnetic interference of the first device 32 with high voltage on the second device 22 with low voltage is favorably reduced. Therefore, the technical scheme of the disclosure can reduce electromagnetic interference while improving the utilization rate of the effective space, thereby being beneficial to improving the electric capacity and the service life of the battery pack 1.

Specifically, referring to fig. 1 and 2, the first circuit board assembly 30 includes a rectifying buck module 31a configured to convert an external alternating current (the AC port in fig. 2) into a direct current adapted to recharge the battery pack 10.

In one embodiment, the rectifying and dropping module 31a includes a voltage detection circuit, which is adapted to detect whether there is ac power access during charging of the battery pack 1 with ac power, and if so, activate a charging circuit to charge the battery pack 10.

In another embodiment, the step-down rectifier module 31a may further include another voltage detection circuit, and when the another voltage detection circuit detects that the rectified and stepped-down input voltage is higher than a preset threshold, the charging circuit is turned off to stop charging, so that the first circuit board assembly 30 has a charging protection function.

The second circuit board assembly 20 includes a cell management module 20a, which is configured to monitor at least the voltage of the battery pack 10, and has protection functions such as overcurrent, short circuit, overdischarge, overcharge, overvoltage output, high/low temperature charge/discharge, and signal interference. Specifically, the cell management module 20a includes a management chip 200a electrically connected to the battery pack 10, and an MCU master 200b connected to the management chip, wherein the MCU master 200b is connected to the rectifying and voltage-reducing module 31 a.

In one embodiment, to reduce power consumption, the MCU master 200b has a sleep function, and when the battery pack 1 is connected to the ac power source, the MCU master is woken up by a high signal and starts to operate.

In another embodiment, the second circuit board assembly further includes a PD module 23 configured to share the second circuit board with the first discharging portion 52, the PD module 23 having a PD protocol and a buck-boost integrated chip 23a, as shown in fig. 2.

It is understood that the rectifying and voltage-reducing module 31a is a functional module formed by some first devices 32 and the conductive lines in the first circuit board 31; the cell management module 20a is a functional module formed by the second device 22 and the conductive lines in the second circuit board 21, for example, the management chip 200a and the MCU master 200b both belong to the second device 22.

Further, with reference to fig. 1, in another embodiment, the area of the second circuit board 21 is larger than the area of the first circuit board 31, the second circuit board 21 includes a first region 21a and a second region 21b connected to each other, the first region 21a and the first circuit board 31 are disposed opposite to each other to form an accommodating space 1a, the second region 21b covers the battery pack 10, and the first circuit board 31 is electrically connected to the first region 21 a. That is, the second circuit board 21 is divided into a first region 21a and a second region 21b along the length direction or the width direction thereof, the area of the first circuit board 31 is smaller than or equal to the area of the first region 21a, and at least one second device 22 and/or at least one first device 32 is located in the first region 21a and is opposite to the first circuit board 31 to form the accommodating space 1a. Because the circuit board has certain flexibility and can play a certain role in buffering, the second region 21b of the second circuit board 21 covers the battery pack 10, so that the second region 21b of the second circuit board 21 can prevent the battery pack 10 from being directly stressed when the battery pack 1 falls or is impacted. Meanwhile, due to the fact that the areas of the second circuit board 21 and the first circuit board 31 are different, the first circuit board 31 can form a sufficient accommodating space 1a with the first area 21a of the second circuit board 21 for mounting the second device 22 and/or the first device 32, and the space occupation of the first circuit board 31 is reduced while the design requirements are met.

Of course, in order to better protect the battery pack 10 and prevent the battery pack 10 from being damaged when dropped or impacted by an external force, the area of the second circuit board 21 may be the same as the area of the first circuit board 31, and at least portions of the second circuit board 21 and the first circuit board 31 simultaneously cover the battery pack 10 with the battery pack 10 between the second circuit board 21 and the first circuit board 31. Thus, since the battery pack 10 is covered by at least portions of the second circuit board 21 and the first circuit board 31, the possibility of the battery pack 10 being directly subjected to force when the battery pack 1 is dropped or struck by an external force can be reduced.

It is understood that the second circuit board 21 and the first circuit board 31 generally have two relatively flat mounting surfaces, and at least a portion of the second circuit board 21 and/or the first circuit board 31 faces the battery pack 10 when covering the battery pack 10, and the other faces away from the battery pack 10. Since the second circuit board 21 and the first circuit board 31 can play a certain role in buffering, in some embodiments of the present disclosure, at least part of the second component 22 may also be mounted on a side of the second circuit board 21 facing the battery pack 10, that is, at least part of the second component 22 is located between the second circuit board 21 and the battery pack 10; and/or at least part of the first component 32 is mounted on the side of the first circuit board 31 facing the battery pack 10, i.e. at least part of the first component 32 is located between the first circuit board 31 and the battery pack 10. In this way, the second circuit board 21 and/or the first circuit board 31 can protect the second device 22 or the first device 32 to a certain extent, and prevent the second device 22 and/or the first device 32 from being damaged by direct impact of external force when the battery pack 1 falls or is impacted by external force.

In order to further reduce the electromagnetic interference of the first device 32 with the second device 22, on the basis that the area of the first circuit board 31 is smaller than or equal to the area of the second circuit board 21, in another embodiment, at least a part of the second device 22 is mounted in the second area 21b, as shown in fig. 1. Thus, the distance between the second device 22 and the first device 32 will be larger, and the creepage distance and the electrical clearance between the second device 22 and the first device 32 are increased, which means that both the conductive type electromagnetic interference and the radiation type electromagnetic interference of the first device 32 to the second device 22 are reduced to some extent, thereby further reducing the electromagnetic interference of the first device 32 to the second device 22.

Specifically, the second device 22 mounted to the second region 21b may face the battery pack 10 to protect the second device 22 using the flexibility of the second circuit board 21; or the second device 22 installed in the second region 21b is away from the battery pack 10 to prevent heat generated from the second device 22 from adversely affecting the battery pack 10; alternatively, the second device 22 mounted in the second region 21b may partially face the battery pack 10 and partially face away from the battery pack 10, and for example, the second device 22 may be faced toward the battery pack 10, which generates a small amount of heat but is not resistant to falling, and the second device 22 may be faced away from the battery pack 10, which generates a relatively large amount of heat but is relatively resistant to falling, to improve the withstand voltage of the battery pack 1.

Referring to fig. 3, since the second circuit board assembly 20, the first circuit board assembly 30, and the battery pack 10 operate for a long time or operate with high power for a short time, a large amount of heat is generated. If the second circuit board assembly 20 and/or the first circuit board assembly 30 covering the battery pack 10 are tightly attached to the surface of the battery pack 10, the heat generated by the second circuit board assembly 20 and the first circuit board assembly 30 is not directly transferred to the surface of the battery pack 10, which is not favorable for the normal operation of the battery pack 10 at high temperature. Thus, to facilitate heat dissipation from the battery pack 1, in one embodiment, the battery pack 10 is spaced apart from at least a portion of the second device 22 and/or the first device 32. That is, a certain gap space exists between the battery pack 10 and the second device 22 and/or the first device 32, and the gap space can be used not only as a buffer space when the second circuit board assembly 20 and/or the first circuit board assembly 30 is impacted by an external force, but also as a heat dissipation space of the battery pack 10, the second circuit board assembly 20 and/or the first circuit board assembly 30, so that heat can be prevented from being accumulated in the battery pack 10 or the second circuit board assembly 20 or the first circuit board assembly 30, and the service life of the battery pack 1 can be prolonged.

Specifically, in order to allow a certain gap between the battery pack 10 and at least a portion of the second device 22 and/or the first device 32 to reduce the influence of heat generated by the second circuit board assembly 20 and/or the first circuit board assembly 30 on the battery pack 10, referring to fig. 3, in an embodiment, the battery pack 10 includes a mounting bracket 10a and a battery cell 10b, the battery cell 10b is mounted on the mounting bracket 10a, and the second circuit board 21 and/or the first circuit board 31 is mounted on the mounting bracket 10 a. That is, the battery cell 10b is disposed at a distance from at least some of the second device 22 and/or the first device 32, and a gap exists between the battery cell 10b and at least some of the second device 22 and/or the first device 32. On one hand, the mounting bracket 10a can fix the battery cell 10b, so that the stability of the battery pack 10 is improved; on the other hand, after the second circuit board 21 and/or the first circuit board 31 are mounted on the mounting bracket 10a, in addition to the gap existing between the battery cell 10b and at least a part of the second device 22 and/or the first device 32 being beneficial to heat dissipation, the mounting bracket 10a may also reduce to some extent that heat generated by the second circuit board 21 and/or the first circuit board 31 is directly transferred to the battery cell 10b.

It will be appreciated that "mounting the second circuit board 21 and/or the first circuit board 31 to the mounting bracket 10a" may include three specific mounting schemes: the second circuit board 21 is mounted on the mounting bracket 10a, and the first circuit board 31 is not mounted on the mounting bracket 10 a; the first circuit board 31 is mounted on the mounting bracket 10a, and the second circuit board 21 is not mounted on the mounting bracket 10 a; the second circuit board 21 and the first circuit board 31 are both mounted on the mounting bracket 10 a. And are not particularly limited herein.

Alternatively, on the basis of the above-described technical solution in which only one of the second circuit board 21 and the first circuit board 31 is mounted on the mounting bracket 10a and the other is not mounted on the mounting bracket 10a, the structure of the battery pack 1 is simplified to be more preferable. In an embodiment of the present disclosure, the second circuit board 21 and the first circuit board 31 may be connected and fixed by a metal support having a conductive property. That is, the second circuit board 21 is mounted on the mounting bracket 10a, and the first circuit board 31 is fixed to the second circuit board 21 in a suspended manner; alternatively, the first circuit board 31 is mounted on the mounting bracket 10a, and the second circuit board 21 is suspended and fixed to the first circuit board 31, as shown in fig. 1. Therefore, the second circuit board 21 and the first circuit board 31 are mounted, the second circuit board 21 and the first circuit board 31 are electrically connected, the mounting and connecting structure of parts in the battery pack 1 can be simplified, and the effective space utilization rate of the battery pack 1 is improved.

Since the level of the effective space utilization rate has an important influence on the overall volume energy density of the battery pack 1, the volume of other parts is reduced as much as possible to increase the effective space utilization rate of the battery cell 10b on the premise of meeting the design requirements, which is an effective way to improve the volume energy density of the battery pack 1. For this reason, referring to fig. 3 to fig. 4, on the basis of the embodiment that the battery pack 1 includes the mounting bracket 10a and the battery cell 10b, the present disclosure further provides a technical solution, in which the mounting bracket 10a includes a first mounting bracket 11 and a second mounting bracket 12 that are oppositely disposed, the second circuit board 21 is mounted on the first mounting bracket 11 and the second mounting bracket 12, the battery cell 10b includes a positive terminal and a negative terminal, one of the positive terminal and the negative terminal is mounted on the first mounting bracket 11, and the other is mounted on the second mounting bracket 12. In this technical solution, since the mounting bracket 10a includes the first mounting bracket 11 and the second mounting bracket 12 that are disposed opposite to each other, one of the positive terminal end and the negative terminal end of the battery cell 10b is mounted on the first mounting bracket 11, and the other is mounted on the second mounting bracket 12, that is, at least a partial region of the outer surface between the positive terminal end and the negative terminal end of the battery cell 10b is not directly supported by the mounting bracket 10 a. Therefore, the size of the mounting bracket 10a is reduced on the premise of ensuring the mounting stability of the battery cell 10b, and the reduced size can be directly used as the heat dissipation space of the battery cell 10b, so that the battery pack 1 does not need to additionally occupy other spaces for heat dissipation, and the space utilization rate can be improved.

Further, in order to make the connection between the battery cells 10b and the first and second mounting brackets 11 and 12 more reliable, the structural stability of the battery pack 10 is improved. Referring to fig. 4, in an embodiment of the present disclosure, a first mounting groove 111 is formed on the first mounting frame 11, a second mounting groove 121 is formed on the second mounting frame 12, and the structural shapes of the first mounting groove 111 and the second mounting groove 121 are respectively matched with the shapes of the positive end and the negative end of the battery cell 10b.

For example, when the battery cell 10b is a cylindrical battery, since the positive electrode terminal and the negative electrode terminal of the cylindrical battery are both cylindrical, in order to make the connection between the battery cell 10b and the first and second mounting frames 11 and 12 more tight and firm, the first and second mounting

grooves

111 and 121 are circular holes, and the diameter of the circular holes matches with the diameter of the cylindrical battery. After the battery cell 10b is mounted on the first mounting frame 11 and the second mounting frame 12, since the shapes of the first mounting groove 111 and the second mounting groove 121 are respectively matched with the shapes of the positive terminal and the negative terminal of the battery cell 10b, the battery cell 10b is not loosened on the first mounting frame 11 and the second mounting frame 12, and the structural stability of the whole battery pack 10 can be improved.

Meanwhile, since the second circuit board 21 is mounted on the first mounting frame 11 and the second mounting frame 12, the electric core can be limited between the first mounting frame 11 and the second mounting frame 12, and the electric core cannot move along the axial direction, so that the structural stability of the battery pack 10 is further improved. When the battery pack 1 is used, people do not need to worry that the battery cell 10b can fall off, and also do not need to worry about falling off between the first mounting frame 11 and the second mounting frame 12 and the battery cell 10b, so that the battery pack 1 is more convenient and faster to mount and use.

According to the current technology level, the voltage of the single battery cell 10b has certain limitation and is difficult to be arbitrarily increased. For example, the voltage of a single lithium ion battery is generally around 3.7V, and even if the volume of the single lithium ion is made larger, the voltage is maintained substantially in the range of around 3.7V. That is, the voltage of the unit cell does not increase as its volume increases. However, the rated voltage of the power tool 2 required in most daily life is usually greater than 3.7V, so in order to make the battery pack 1 better fit various power tools 2, in some embodiments of the present disclosure, the number of the battery cells 10b is at least two or at least three, so that the output parameters of the voltage of the battery pack 1 can be enriched to fit different power tools 2.

As an example, the number of the battery cells 10b is at least two, and the electrical connection relationship between at least two battery cells 10b is parallel connection or series connection. In this way, when at least two battery cells 10b are connected in parallel, the battery pack 1 may output a larger current; when at least two battery cells are connected in series, the battery pack 1 can output a larger voltage. Thereby meeting the use requirements of the electric tool 2 with different performance parameters.

As another example, the number of the battery cells 10b is at least three, and the electrical connection relationship between the at least three battery cells 10b is parallel and/or series. That is, the electrical connection relationship between the at least three battery cells 10b may be parallel connection, so as to output a larger current to meet the requirement of the electric tool 2 on the voltage parameter; alternatively, the at least three battery cells 10b may be connected in series, so as to output a larger voltage to meet the current parameter requirement of the electric tool 2; alternatively, at least three battery cells 10b may be electrically connected in series or in parallel. When all the battery cells 10b are electrically connected in series, once a certain battery cell 10b cannot normally operate, it means that the entire battery pack 1 cannot output current. Although the parallel use of all the battery cells 10b can avoid the situation that the whole battery pack 1 cannot work normally due to the damage of a single battery cell 10b, the parallel connection of all the battery cells 10b also results in that the output voltage of the battery pack 10 is equivalent to the voltage of the single battery cell 10b (without using a transformer), and the output voltage of the battery pack 1 cannot meet the requirement of the electric power tool 2. The electrical connection relationship among the at least three battery cells 10b is a technical scheme of series connection and parallel connection, which not only has the advantages of series connection and parallel connection, but also can better avoid the disadvantages of series connection and parallel connection, so that the output stability of the battery pack 1 is better.

Please refer to fig. 4, which refers to fig. 1 if necessary. In order to achieve the above-mentioned electrical connection relationship between the different battery cells 10b, in an embodiment of the present disclosure, the battery pack 10 further includes a first conductive member 13 and a second conductive member 14, and the first conductive member 13 and the second conductive member 14 are respectively mounted on the first mounting frame 11 and the second mounting frame 12. The first conductive member 13 electrically connects the second circuit board 21 to the positive terminal (or negative terminal) of the cell 10b, and the second conductive member 14 electrically connects the second circuit board 21 to the negative terminal (or positive terminal) of the cell 10b. Corresponding circuitry and switch 72 devices are provided on the second circuit board 21. The positive and negative terminals of at least two battery cells 10b or at least three battery cells 10b may be connected to the second circuit board 21 in series and/or in parallel. So, the first electrically conductive piece 13 and the electrically conductive piece 14 of second have not only realized the electricity between electric core 10b and the second circuit board 21 and are connected, moreover because the first electrically conductive piece 13 is installed on first mounting bracket 11, the electrically conductive piece 14 of second is installed on second mounting bracket 12, the first electrically conductive piece 13 and the electrically conductive piece 14 of second can not occupy the space between first mounting bracket 11 and the second mounting bracket 12 (also the installation space of electric core 10 b), consequently be favorable to improving the effective space utilization of battery package 1.

Specifically, the material of the first conductive member 13 and the second conductive member 14 may be nickel. Since nickel has good electrical conductivity, relatively low density, and good solderability. Therefore, not only the overall weight of the battery pack 10 can be reduced; moreover, since nickel has good welding performance, it is beneficial to welding and fixing the first conductive piece 13, the second conductive piece 14 and the battery cell 10b, and welding and fixing the first conductive piece 13, the second conductive piece 14 and the second circuit board 21, and further beneficial to improving the connection reliability between the battery cell 10b and the second circuit board 21.

Further, in order to reduce the number of soldering positions of the first and second

conductive members

13 and 14 to the second circuit board 21, the circuit on the second circuit board 21 is simplified and the risk of poor contact is reduced. Referring to fig. 1, in another embodiment of the present disclosure, a first conductive member 13 is connected to the positive terminals (or the negative terminals) of at least two battery cells 10b, and another second conductive member 14 is connected to the negative terminals (or the positive terminals) of the at least two battery cells 10b. Therefore, compared with the technical scheme that each battery cell 10b is connected with the second circuit board 21 through one first conductive piece 13 and one second conductive piece 14, the welding points between the first conductive piece 13 and the second conductive piece 14 and the second circuit board 21 are reduced, which is beneficial to reducing the probability of insufficient welding or poor contact, thereby improving the reliability of the electrical connection between the battery cell 10b and the second circuit board 21.

Further, in other embodiments, the second device 22 further includes an adjustable switch, and the adjustable switch is used for switching between series connection and parallel connection between at least two battery cores 10b, so that the battery pack 1 can selectively output different current or voltage parameters according to the operation requirement of the electric power tool 2, thereby facilitating the improvement of the applicability of the electric power tool 2. Specifically, the adjustable switch may be a common switch button, or may be a single chip with a high degree of automation, and the like, and is not limited herein.

In some embodiments of the battery pack 1 without an outer casing for protection (such as the battery pack shown in fig. 1), in order to ensure the operation safety of the battery pack 1 during use, a relatively sealed battery compartment is required to be provided on the electric device, and the battery pack 1 without the outer casing is fixedly installed in the battery compartment. Although the relatively sealed battery compartment can protect the battery pack 1, the application range of the battery pack 1 is limited, and the connection, installation and detachment processes of the battery pack 1 and the electric equipment are complicated.

To facilitate the carrying and use of the battery pack 1 while preventing foreign materials such as external dust from damaging the battery pack 10, the second circuit board assembly 20, and the first circuit board assembly 30. Referring to fig. 5 to 6, and as needed to fig. 1, based on any of the above embodiments, the battery pack 1 provided by the present disclosure further includes a housing 40, a first charging portion 51 and a first discharging portion 52, the battery pack 10, the second circuit board assembly 20 and the first circuit board assembly 30 are disposed inside the housing 40, the battery pack 10 is fixed to the housing 40 through a mounting bracket 10a, the first circuit board 31 is fixed to the housing 40 or the mounting bracket 10a, the first charging portion 51 is electrically connected to the first circuit board 31 and at least partially exposed, and the first discharging portion 52 is electrically connected to the second circuit board 21 and at least partially exposed. Thus, the battery pack 10, the second circuit board assembly 20 and the first circuit board assembly 30 are arranged inside the casing 40, so that the casing 40 can protect the battery pack 10, the second circuit board assembly 20 and the first circuit board assembly 30, not only can damage of sundries to the battery pack 1 be effectively prevented, but also the battery pack 1 is convenient to carry; meanwhile, the first charging part 51 and the first discharging part 52 are at least partially exposed, so that the charging operation of the battery pack 1 or the connection operation with the electric equipment is simpler and more convenient.

Specifically, the first charging portion 51 is an alternating current plug, also known as an AC plug. In this way, when the electric energy stored in the battery pack 1 is exhausted, the battery pack 1 can be directly plugged into an ac power outlet through the first charging unit 51 to be charged without using the dc charger 4.

It is understood that the type of the AC plug may include, but is not limited to, chinese standard, european standard, or U.S. standard, thereby satisfying electrical standards of different countries and improving market adaptability of the battery pack 1.

Further, referring to fig. 5 to 6, in one embodiment, the housing 40 includes a first housing 41, a second housing 42, and a middle frame 43 having an accommodating portion 431, the first charging portion 51 and the first discharging portion 52 are disposed on the middle frame 43, the battery pack 10 is mounted in the accommodating portion 431 of the middle frame 43 through a mounting bracket 10a, and the first housing 41 and the second housing 42 are detachably connected to the middle frame 43. On one hand, the battery pack 10 is mounted in the accommodating portion 431 of the middle frame 43, so that the battery pack 10 can be limited, and the battery pack 1 is prevented from shaking in the carrying process or vibrating along with the vibration of the electric tool 2 after being connected to the electric tool 2; moreover, the middle frame 43 can play a certain role in buffering and protecting the battery pack 10. On the other hand, the battery pack 10 is mounted in the accommodating portion 431 of the middle frame 43, while the first case 41 and the second case 42 are detachably attached to the middle frame 43 to close the accommodating portion 431, and the first case 41 and the second case 42 function to cover the middle frame 43 to enclose the battery pack 10 without specially providing a space for accommodating the battery pack 10, which is advantageous to reduce the processing cost of the first case 41 and the second case 42. Meanwhile, the first case 41 and the second case 42 are detachably attached to the middle frame 43, which also facilitates the detachment and assembly of the battery pack 1.

It should be noted that, after the first casing 41 and the second casing 42 are detachably connected to the middle frame 43, the middle frame 43 is located between the first casing 41 and the second casing 42, the first casing 41 and the second casing 42 are covered on the middle frame 43, and at least a portion of the middle frame 43 is exposed, as shown in fig. 5.

Further, referring to fig. 7, in order to reduce the weight of the battery pack 1, in some embodiments, the bottom surface of the accommodating portion 431 is hollowed, that is, at least one through hole is formed in the bottom surface of the accommodating portion 431, so as to achieve the effect of reducing the weight of the battery pack 1, which is beneficial to the carrying of the battery pack 1 and the use of the electric tool 2; on the other hand, the hollow-out arrangement enables the bottom of the middle frame to be provided with certain elasticity, and a certain buffering and damping function can be achieved for the battery pack 10.

Referring to fig. 4, the mounting bracket 10a is provided with a first mounting hole 101 and a second mounting hole 102 which are coaxially arranged, the second circuit board 21 is mounted on the mounting bracket 10a through the first mounting hole 101, and the mounting bracket 10a is mounted on the middle frame 43 through the second mounting hole 102. On one hand, since the first mounting hole 101 and the second mounting hole 102 are coaxial, when the mounting bracket 10a is manufactured, the first mounting hole 101 and the second mounting hole 102 can be simultaneously manufactured at one time, so that the manufacturing process and cost of the mounting bracket 10a can be reduced, and the manufacturing accuracy of the mounting bracket 10a can be improved. For example, when the first mounting hole 101 and the second mounting hole 102 are cast, the first mounting hole 101 and the second mounting hole 102 are coaxially designed, so that the structure of the mold for manufacturing the mounting bracket 10a can be simplified. Or, if the first mounting hole 101 and the second mounting hole 102 are formed by a drilling process, the first mounting hole 101 and the second mounting hole 102 are coaxially designed, and the first mounting hole 101 and the second mounting hole 102 which are coaxially designed can be directly drilled through the mounting bracket 10a, so that the machining efficiency of the mounting bracket 10a can be improved, the machining cost can be reduced, and the machining error caused by multiple times of machining can be avoided.

Further, referring to fig. 6 and 7, as necessary, referring to fig. 1, the mounting bracket 10a is provided with a first positioning portion 103, the middle frame 43 is provided with a second positioning portion 432, and the first positioning portion 103 and the second positioning portion 432 cooperate to position and fit the battery pack 10 in the accommodating portion 431 of the middle frame 43. By the cooperation of the first positioning portions 103 and the second positioning portions 432, the positioning of the battery pack 10 and the middle frame 43 can be quickly achieved, so that the assembly accuracy and the assembly efficiency of the battery pack 1 can be improved.

Specifically, the first positioning portion 103 may include, but is not limited to, a groove (e.g., a positioning hole, a V-shaped groove), and a step surface, and correspondingly, the second positioning portion 432 may include, but is not limited to, a protrusion (e.g., a positioning post, a V-shaped block), and a step surface, which are not illustrated herein.

For example, in one embodiment, the first positioning portion 103 includes a groove, the second positioning portion 432 includes a protrusion, the height of the protrusion is greater than the depth of the groove, and the protrusion and the groove cooperate to space the battery pack 10 from the bottom surface of the receiving portion 431. Since the height of the protrusion is greater than the depth of the groove, after the battery pack 10 is mounted on the middle frame 43, a space may exist between the battery pack 10 and the middle frame 43, and the space may be present to facilitate heat dissipation of the battery pack 10.

It is understood that in the embodiment where the mounting bracket 10a includes the first mounting frame 11 and the second mounting frame 12, the first mounting frame 11 and/or the second mounting frame 12 are provided with a first mounting hole 101 and a second mounting hole 102 which are coaxially arranged. Correspondingly, the middle frame 43 is also provided with a third mounting hole 438 corresponding to the second mounting hole 102, as shown in fig. 7. The mounting bracket 10a is screwed and fixed through the second mounting hole 102 and the third mounting hole 438, which is convenient for assembly and disassembly. Similarly, the first positioning portion 103 is disposed on the first mounting frame 11 and/or the second mounting frame 12, and will not be described in detail here.

Referring to fig. 7 and 8, in an embodiment, the middle frame 43 is provided with a third positioning portion 433, the second casing 42 is provided with a fourth positioning portion 421, and the third positioning portion 433 and the fourth positioning portion 421 are matched with each other to fix the middle frame 43 to the second casing 42. Through the cooperation of the third positioning portion 433 and the fourth positioning portion 421, the positioning of the middle frame 43 and the second case 42 can be quickly achieved, so that the assembly accuracy and the assembly efficiency of the battery pack 1 can be improved.

Specifically, third location portion 433 is the quad slit, and fourth location portion 421 is the quad block, through the cooperation of quad slit and quad block, not only can realize the location of center 43 and second casing 42, but also can carry out spacing restriction center 43 to center 43 and produce the displacement for second casing 42, improve center 43 and second casing 42's installation stability.

Of course, the specific structures of the third positioning portion 433 and the fourth positioning portion 421 may also refer to the specific structures of the first positioning portion 103 and the second positioning portion 432, which is not illustrated here.

It should be noted that there are various technical solutions for "the first housing 41 and the second housing 42 are detachably connected to the middle frame 43".

For example, referring to fig. 8 to 11, in an embodiment, the first housing 41 and the second housing 42 are connected by a clamping structure 60, the clamping structure 60 includes a first clamping protrusion 61 and a first clamping groove 62, one of the first clamping protrusion 61 and the first clamping groove 62 is disposed on the first housing 41, the other is disposed on the second housing 42, the middle frame 43 is located between the first housing 41 and the second housing 42, and the first housing 41 and the second housing 42 are clamped and matched by the first clamping protrusion 61 and the first clamping groove 62 to fix the middle frame 43. Therefore, on one hand, the first housing 41 and the second housing 42 are detachably connected through the first locking protrusion 61 and the first locking groove 62, so that the battery pack 1 is conveniently assembled and disassembled, and on the other hand, the middle frame 43 is located between the first housing 41 and the second housing 42, so that the compressive strength of the housing 40 can also be improved.

Or, referring to fig. 10 to 11, based on the above-mentioned embodiment that "the first housing 41 and the second housing 42 are connected through the locking structure 60" and/or "the second housing 42 and the middle frame 43 are positioned through the cooperation of the third positioning portion 433 and the fourth positioning portion 421", the second housing 42 is further provided with one of the second locking protrusion 63 and the second locking groove 64, the other is provided on the middle frame 43, the second housing 42 and the middle frame 43 are detachably connected through the second locking protrusion 63 and the second locking groove 64, and the first housing 41 and the second housing 42 are detachably connected through the first locking protrusion 61 and the first locking groove 62 and fix the middle frame 43. Therefore, on one hand, the second shell 42 is clamped with the middle frame 43, the second shell 42 is clamped with the first shell 41 and clamps and fixes the middle frame 43, the connection tightness among the first shell 41, the second shell 42 and the middle frame 43 is increased, and the difficulty of falling of the clamping fit of the first shell 41 and the second shell 42 is increased; on the other hand, even if the snap fit between the first case 41 and the second case 42 falls, other parts do not fall off, and the structural reliability of the battery pack 1 can be improved.

Alternatively, one of the first locking protrusion 61 and the first locking groove 62 is provided on the first casing 41 and the second casing 42, the other is provided on the middle frame 43, and the first casing 41 and the second casing 42 are locked and fixed to the middle frame 43 by the first locking protrusion 61 and the first locking groove 62. In this way, the first housing 41 and the second housing 42 can be more easily attached and detached.

In the above embodiment, the first locking protrusion 61 and the first locking groove 62 are both located in the accommodating portion of the middle frame 43; after the first locking protrusion 61 and the first locking groove 62 are locked and matched, the middle frame 43 is clamped between the first housing 41 and the second housing 42. As an optional implementation manner, the inner side wall of the middle frame is provided with a limiting groove 439 matched with the first clamping protrusion. This makes it easier to assemble the first case 41, the second case 42, and the center frame 43.

Referring to fig. 6 to 9, when the first housing 41 is assembled with the middle frame 43 and the second housing 42, since the connection and fixation of the first housing 41 and the second housing 42 is achieved by the elastic fit between the first locking protrusion 61 and the first slot, if excessive force is applied when the first housing 41 is connected to the second housing 42 and/or the middle frame 43, the first locking protrusion 61 and the first slot which are already fitted together may be separated, and thus the first housing 41 may be installed insecurely. In order to avoid this situation, on the basis of any of the above embodiments, the first housing 41 is provided with the first limiting portion 411, the middle frame 43 is provided with the second limiting portion 434, and the first limiting portion 411 and the second limiting portion 434 are matched to make the first housing 41 be in limiting fit with the middle frame 43. During the installation process of the first housing 41, when the first limiting portion 411 and the second limiting portion 434 are in limiting fit, the first housing 41 can no longer move continuously in the direction close to the middle frame 43, so that the first locking protrusion 61 and the first locking groove 62 which are already fitted together can be prevented from falling off. Meanwhile, when the first limiting portion 411 and the second limiting portion 434 are in limiting fit, the first housing 41 can no longer move continuously in the direction close to the middle frame 43, which means that even if the battery pack 1 is impacted by external force, the second limiting portion 434 can support the first housing 41, and the first housing 41 can not move in the direction close to the middle frame 43, so that the structural strength of the housing 40 is enhanced.

Specifically, the first stopper 411 is a projection extending in the thickness direction of the first housing 41, and the second stopper 434 is a surface of a certain area of the accommodating part 431, which is disposed opposite to the bottom surface of the accommodating part 431.

Of course, in other embodiments, the first limiting portion 411 may also be disposed on the second casing 42 to further enhance the structural strength of the casing 40, which is not described herein again.

It is understood that, in other embodiments, the middle frame 43 may also be located inside the space surrounded by the first casing 41 and the second casing 42 to further improve the sealing performance of the battery pack 1. For example, the first case 41 has a box structure with an opening, the second case 42 is a cover plate, the assembled battery pack 10, the second circuit board assembly 20, and the first circuit board assembly 30 are integrally mounted on the middle frame 43, the middle frame 43 is placed inside the first case 41, and the second case 42 is finally covered on the opening of the first case 41, thereby assembling the battery pack 1. This technical scheme can reduce the connection gap length of first casing 41 and second casing 42, is favorable to improving the sealed reliability of battery package 1.

Referring to fig. 3, since the battery pack 10 is located in a relatively closed space during use, heat in the space is difficult to dissipate, and a large heat accumulation easily causes a certain influence on the battery pack 10. In order to prevent the battery pack 10 from being damaged by heat, referring to fig. 3, in some embodiments, the second device 22 includes a temperature monitor 221, the temperature monitor 221 is electrically connected to the second circuit board 21 and faces the battery pack 10, and the temperature monitor 221 is used for monitoring the temperature of the battery pack 10, so as to prevent the battery pack 10 from being damaged or self-ignited due to over-high temperature.

Illustratively, the temperature monitor 221 abuts the surface of the battery cell 10b to better monitor the surface temperature of the battery cell 10b. Alternatively, the temperature monitor 221 may be close to but not in contact with the surface of the battery cell 10b, and a certain gap may be provided between the temperature monitor 221 and the surface of the battery cell 10b. Due to the existence of the gap, a certain buffer space can be prevented from being formed between the temperature monitor 221 and the battery cell 10b when the battery pack 1 is impacted by external force, and the temperature monitor 221 is prevented from being directly collided with the battery cell 10b to be damaged.

Referring to fig. 5, in order to reduce the occupied space of the battery pack 1 in the non-charging state, in an embodiment, the housing 40 is provided with a first opening 401, the first charging portion 51 is movably connected to the housing 40, the first charging portion 51 has a first state (51 indicated by a dotted line in fig. 5) and a second state (51 indicated by a solid line in fig. 5), the first charging portion 51 is accommodated in the first opening 401 in the first state, and at least a portion of the first charging portion 51 protrudes from the first opening 401 in the second state. In this way, when the battery pack 1 needs to be charged by the ac power plug, the first charging unit 51 may be at least partially separated from the first opening 401, and the first charging unit 51 may be inserted into the ac power plug to start charging the battery pack 1. After the battery pack 1 is charged or when the battery pack 1 does not need to be charged any more, the first charging portion 51 can be accommodated in the first opening 401, so that the first charging portion 51 is prevented from occupying too large space due to protruding out of the surface of the housing 40, and the storage, carrying and use of the battery pack 1 are facilitated.

However, in the above-described technical solution, the first charging section 51 needs to be switched between the first state and the second state a plurality of times throughout the life cycle of the battery pack 1; and if the battery pack 1 is in the vertical state during charging, the connection between the first charging portion 51 and the housing 40 is subject to a large torque, which may easily cause the first housing 41 and the second housing 42 to be detachably connected to be loosened. Therefore, in order to reinforce the structural strength of the housing 40, the risk of the first housing 41 and the second housing 42 coming loose is reduced. Referring to fig. 8 to 11, referring to fig. 1 and 5 as necessary, in an embodiment of the present disclosure, the clamping structure 60 includes a first clamping structure 60a and a second clamping structure 60b, each of the first clamping structure 60a and the second clamping structure 60b includes a first clamping protrusion 61 and a first clamping groove 62, the first clamping structure 60a is disposed around the first housing 41 and the second housing 42, and the second clamping structure 60b is disposed between the first opening 401 and the receiving space 1a. The first clamping structure 60a arranged around the first shell 41 and the second shell 42 realizes the clamping fit of the first shell 41 and the second shell 42; and because second joint structure 60b sets up again between first opening 401 and accommodation space 1a, the distance between second joint structure 60b and the first portion 51 that charges is less, has reduced the moment of action of first portion 51 to casing 40 equivalently to the structural strength of casing 40 that can strengthen.

Referring to fig. 6, based on any of the above embodiments, the battery pack 1 may further include a display device 71, the display device 71 is connected to the housing 40 and is exposed, the display device 71 is electrically connected to the second circuit board 21 and/or the first circuit board 31, and the display device 71 is configured to display operating parameters of the battery pack 1. The working parameters of the battery pack 1 are displayed in real time through the display device 71, so that people can know the working condition of the battery pack 1 in time.

It will be appreciated that the display device 71 may be a display screen or a human-computer interaction screen capable of displaying more parameters; or an indicator light that can only display a single performance parameter, such as an indicator light for displaying the power of the battery pack 1, which is not limited herein.

Further, with continued reference to fig. 6, the battery pack 1 may further include a switch 72, the switch 72 is electrically connected to the second circuit board 21 and/or the first circuit board 31, and the switch 72 is used to trigger the switching of the battery pack 1 between the on state and the off state. Thus, when the battery pack 1 needs to work, the working state of the battery pack 1 can be switched from the off state to the on state through the switch 72; when the battery pack 1 does not need to output current or voltage, the switch 72 can switch the operating state of the battery pack 1 from the on state to the off state, so as to avoid the electric quantity of the battery pack 1 from being wasted, and therefore, the battery pack 1 can be prevented from being frequently charged, and the service life of the battery pack 1 can be prolonged.

In particular, the switch 72 may be an exposed physical switch 72 so that a person can manually switch the operating state of the battery pack 1 as desired. Alternatively, the switch 72 may be another component (e.g., MCU) integrated on the second circuit board 21 and/or the first circuit board 31, and can automatically sense the connection state between the battery pack 1 and the electric device and automatically switch the operating state of the battery pack 1 accordingly, for example, when the battery pack 1 is connected to the electric device, the switch 72 automatically switches the battery pack 1 from the off state to the on state, and when the battery pack 1 is disconnected from the electric device, the switch 72 automatically switches the battery pack 1 from the on state to the off state, without manual operation of a human.

Further, with reference to fig. 6, when the battery pack 1 is provided with the switch 72 and the display device 71 at the same time, the switch 72 is mounted on the housing 40 and exposed, the display device 71 is mounted on the switch 72, and the display device 71 is spaced from the accommodating space 1a. The display device 71 is arranged on the switch 72, so that the space occupation of the battery pack 1 is reduced; meanwhile, the display device 71 and the accommodating space 1a are arranged at an interval, which is beneficial to reducing the electromagnetic interference of the second device 22 and/or the first device 32 installed in the accommodating space 1a to the display device 71 and improving the working accuracy of the display device 71.

Referring to fig. 3, in the embodiment having the first discharging portion 52, the battery pack 1 may further include a shielding member 73, the shielding member 73 is mounted on the housing 40 or the first discharging portion 52, and the shielding member 73 is used for shielding the first discharging portion 52. So that foreign matters such as dust from the outside can be prevented from affecting the normal operation of the first discharging portion 52.

Further, with reference to fig. 12, in an example, the first discharging portion 52 includes a discharging channel 521, the protection member 73 is fixedly disposed in the discharging channel 521, and a deformation portion 731 is disposed on the protection member 73, and the deformation portion 731 is used for automatically opening and closing the discharging channel 521. In this way, when the battery pack 1 is inserted into the electric device so that the battery pack 1 supplies power to the electric device through the first discharging portion 52, the deformation portion 731 automatically opens the discharging channel 521; when the battery pack 1 is pulled out from the electric equipment, the deformation part 731 can automatically close the discharge channel 521, so that dust and the like can be effectively prevented from entering the battery pack 1.

Specifically, the protection member 73 may be a silicon gel having relatively strong deformability and self-recovery capability, and the deformation portion 731 may be a "cross" scribe line formed on the surface of the silicon gel and penetrating through the silicon gel, and the "cross" scribe line is automatically opened when the battery pack 1 is connected to the electric equipment through the first discharge portion 52, that is, when a connector on the electric equipment is inserted into the discharge channel 521. When the electric equipment is separated from the battery pack 1, the cross-shaped marking line automatically returns to the closed state.

Since the battery pack 1 needs to be frequently replaced to support a long-time work, the shorter the charging time of the battery pack 1, the better. In addition, the current direct current quick charging technology is greatly improved compared with the prior art. Therefore, in order to make the charging speed of the battery pack 1 faster, referring to fig. 5, in some embodiments, the battery pack 1 further includes a second charging portion 53 in addition to the first charging portion 51 capable of converting an alternating current into a direct current, and the second charging portion 53 is electrically connected to the second circuit board 21 and at least partially exposed. Since the first circuit board 31 is electrically connected to the second circuit board 21, the first circuit board assembly 30 converts the alternating current into the direct current and inputs the direct current to the second circuit board assembly 20, and thus the operating current of the second circuit board assembly 20 is the direct current. The second charging section 53 connected to the second circuit board 21 can be allowed to connect the dc charger 4 (particularly, the dc charger 4 having a quick charging function), and not only can the selectivity of the charging mode of the battery pack 1 be improved, but also the charging speed of the battery pack 1 can be improved.

Further, with reference to fig. 5 and fig. 6, as necessary, referring to fig. 11, in some embodiments, the housing 40 further includes a second receiving groove 402, the battery pack 1 further includes a second discharging portion 54, the second discharging portion 54 includes a wire 541 and a connector 542 connected to each other, the wire 541 is electrically connected to the second circuit board assembly 20, and the second discharging portion 54 can be received in the second receiving groove 402. In this way, the discharge port of the battery pack 1 can be increased, so that the battery pack 1 can provide electric energy for more electric devices at the same time. Meanwhile, the second discharging portion 54 can be accommodated in the second accommodating groove 402, which also makes the use, carrying and accommodating of the battery more convenient.

Specifically, the connector 542 of the second discharging portion 54 may include, but is not limited to, one or a combination of a Type a USB plug, a Type B USB plug, a Mini Type B USB plug, a Type C plug, and a lighting plug, so that the battery pack 1 may provide power for various mainstream electronic devices, thereby improving market applicability of the battery pack 1.

Alternatively, with reference to fig. 5, in other embodiments, the battery pack 1 further includes a third discharging portion 55, and the third discharging portion 55 is electrically connected to the second circuit board 21 and at least partially exposed. Thus, the discharge port of the battery pack 1 is further increased, so that the battery pack 1 can provide electric energy for more electric devices at the same time.

Specifically, the third discharging portion 55 may be a standard USB port, so that the battery pack 1 can accommodate more data lines 3, thereby supplying power to different electronic devices.

Since the rated operating currents of different electric devices may be different, if the battery pack 1 can only supply one current, the use range of the battery pack 1 is limited. To this end, in order to make the battery pack 1 adaptable to more electric devices, referring to fig. 1 and 5, in some embodiments, the second device 22 further includes a cell manager 222, and the cell manager 222 is configured to convert the input voltage of the battery pack 10 into a first target current or a second target current, the first target current and the second target current having different current values, the first target current being output from the first discharging part 52, and the second target current being output from the second discharging part 54 and/or the third discharging part 55. In this way, when the rated current of the electric device is the first target current, the battery pack 1 can be connected to the electric device through the first discharging part 52; when the rated current of the electric device is the second target current, the battery pack 1 may be connected to the electric device through the second discharge portion 54 or the third discharge portion 55, thereby improving the adaptation range of the battery pack 1.

With continued reference to fig. 5, in some embodiments, to facilitate the operation and use of the battery pack 1, the outer side of the middle frame 43 includes a first side 435, a second side 436, and a third side 437, the first side 435 and the third side 437 are disposed opposite to each other, the second side 436 connects the first side 435 and the third side 437, the first charging portion 51 is located on the first side 435, the first discharging portion 52 is located on the second side 436, the second discharging portion 54 is at least partially located on the second side 436, and the second charging portion 53 and the third discharging portion 55 are located on the second side 436. Since the first charging portion 51 and the first discharging portion 52, the second charging portion 53, the second discharging portion 54, and the third discharging portion 55 are not on the same surface, when the battery pack 1 is inserted into an ac power outlet through the first charging portion 51 for charging, the first discharging portion 52, the second charging portion 53, the second discharging portion 54, and the third discharging portion 55 are not blocked and can be used normally.

It is understood that "the second discharging portion 54 is at least partially located on the second side surface 436" includes, but is not limited to, "the second discharging portion 54 is entirely located on the second side surface 436", so that the second receiving groove 402 is located on one surface, the processing difficulty of the second receiving groove 402 is reduced, and the processing and manufacturing of the battery pack 1 are facilitated; and "the second discharging portion 54 is partially located at the second side 436 and partially located at the third side 437", since the second receiving groove 402 spans the second side 436 and the third side 437, the second discharging portion 54 is partially bent to span the second side 436 and the third side 437 when being received in the second receiving groove 402, and the second charging portion 53 can be more closely fitted to the second receiving groove 402.

Specifically, the length direction (Y direction in fig. 5) of the first side 435 and the third side 437 is the same as the length direction of the battery pack 1, so that when the battery pack 1 is vertically inserted into an ac power outlet (as shown in fig. 16), the overturning moment of the battery pack 1 to the ac power outlet is small, which is beneficial to avoiding that the ac power outlet is damaged or the battery pack 1 falls off during the charging process.

Alternatively, in other embodiments, the second charging portion 53 and the third discharging portion 55 are located on the second side 436, so that the second charging portion 53 and the third discharging portion 55 can face people even when the battery pack 1 is inserted into an ac power outlet in a vertical direction, thereby facilitating the use of the battery pack 1.

Referring to fig. 13, in still other embodiments, the present disclosure further provides an electric tool 2, and the electric tool 2 can use the battery pack 1 provided in any of the above embodiments as a power source. Since the space utilization rate of the battery pack 1 applied to the power tool 2 is improved and the electromagnetic interference inside the battery pack 1 is reduced, the energy density and the service life of the battery pack 1 are improved, and thus the power tool 2 using the battery pack 1 can have a longer working time and a longer service life.

Further, in some embodiments, the power tool 2 further includes a slot 200 for mounting the battery pack 1, the first charging part 51 has a first state of being received in the housing 40 and a second state of being protruded from the housing 40, and the battery pack 1 has a discharging state and a charging state; when the battery pack 1 is in a discharging state, at least a part of the battery pack 1 is positioned in the slot 200 and provides electric energy for the electric tool 2 through the first discharging part 52, and the first charging part 51 is accommodated in the shell 40; when the battery pack 1 is in a charging state, the battery pack 1 is separated from the slot 200, and the first charging portion 51 protrudes from the housing 40 and can be directly connected to an external ac power source to charge the battery pack 10.

Referring to fig. 5, when the battery pack 1 is inserted into the slot 200 of the power tool 2, the second side surface 436 is inserted in a direction facing the slot 200, so that when the battery pack is at least partially located in the slot 200, the first charging portion 51 and the second discharging portion 54 are at least partially shielded by the inner surface of the slot 200, thereby effectively preventing the first charging portion 51 and the second discharging portion 54 from being misused when the battery pack 1 is in a discharging state.

Referring to fig. 14 to 17, the battery pack 1 according to some embodiments of the present disclosure has at least one of the following charging states:

in the first state, the battery pack 1 is connected to an external power source, and the battery pack 10 is recharged through the second charging section 53, as shown in fig. 14. Specifically, the second charging portion 53 is plugged into an ac power outlet for charging by a data line 3 in cooperation with a dc charger 4. Alternatively, referring to fig. 15, the second charging unit 53 is cooperatively connected to the dc power supply 5 via a data line 3 for charging (e.g., a USB charging port provided on a socket).

In the second state, the battery pack 1 is connected to an ac power source, and the battery pack 10 is recharged by the first charging section 51, as shown in fig. 16.

The present disclosure provides a battery pack 1, which is equipped with a first charging unit 51 capable of being directly connected to an external ac power source, and when the battery pack 1 runs out of power and needs to be charged, the battery pack 1 is directly connected to the external ac power source through the first charging unit 51 to recharge the battery pack 10 without configuring a dedicated charger. On the other hand, the battery pack 10 can be recharged through the second charging portion 53, for example, the external power source is connected to the data line 3 by adopting a bidirectional type-c interface, so as to recharge the battery pack 10.

In some embodiments, the first and

second charging sections

51 and 53 inhibit simultaneous recharging of the battery pack 10 to avoid excessive heating of the battery pack 1.

In other embodiments, referring to fig. 17, the first charging unit 51 and the second charging unit 53 have different charging powers, and when they are connected to the power source at the same time, the battery pack 10 is preferably recharged by using the one with the higher charging power.

For example, when the charging power 45W of the second charging unit 53 and the charging power 20W of the first charging unit 51 are connected to the power source at the same time, the second charging unit 53 of 45W having a larger charging power is preferentially used to recharge the battery pack 10, and the first charging unit 51 is not allowed to recharge the battery pack 10 even though it is inserted into the ac power outlet, because it is still prohibited.

Furthermore, when the recharging of the battery pack 10 is disconnected from the one with the higher charging power, the other with the lower charging power is automatically turned on to continue the recharging of the battery pack 10.

For example, when the 45W second charging unit 53 with a larger charging power is cut off due to some reason, such as the power of the dc power supply 5 is exhausted or the ac power supply is disconnected, the 20W first charging unit 51 will automatically turn on to continue recharging the battery pack 10.

Still alternatively, referring to fig. 17, the first charging unit 51 and the second charging unit 53 have the same charging specification and charging power, such as the same charging voltage and charging current, and both can simultaneously recharge the battery pack 10, so as to increase the charging power and reduce the charging time.

On the other hand, the present disclosure also provides an assembling method of a battery pack, where the battery pack may be the battery pack 1 in any of the above embodiments of the present disclosure, and the assembling method is not specifically limited herein, and the assembling method at least includes the following steps:

s1: mounting the second circuit board assembly to the battery pack;

s2: mounting a first circuit board and a first charging portion on a middle frame, and electrically connecting the first circuit board and the first charging portion, wherein the middle frame has an accommodating portion in which the first circuit board is mounted, and the first charging portion is mounted on an outer surface of the accommodating portion;

s3: mounting the battery pack into the receiving portion of the middle frame, and electrically connecting the second circuit board assembly and the first circuit board assembly;

s4: providing a first shell and a second shell, and connecting the first shell and the second shell together to fix a middle frame; wherein, the center is located between first casing and second casing.

As an alternative embodiment; the step S1 further includes: providing a mounting bracket and a battery cell, and mounting the battery cell on the mounting bracket; providing a first nickel sheet and a second nickel sheet, welding one end of the first nickel sheet to the positive end of the battery cell, welding the other end of the first nickel sheet to the second circuit board assembly, and welding one end of the second nickel sheet to the negative end of the battery cell, and welding the other end of the second nickel sheet to the second circuit board assembly;

It should be noted that the "first latch structure 60a" may be a part of the first housing 41, that is, the "first latch structure 60a" and the "other part of the first housing 41" are integrally formed; or it may be a separate component that is separable from the "other parts of the first housing 41", i.e., the "first latch structure 60a" may be manufactured separately and then combined with the "other parts of the first housing 41" into a whole.

Equivalently, the "body" and the "certain part" can be parts of the corresponding "component", i.e., the "body" and the "certain part" are integrally manufactured with other parts of the "component"; the "part" can be manufactured separately from the "other part" and then combined with the "other part" into a whole. The expressions "a certain part" and "a certain part" in the present disclosure are only one embodiment, and are not intended to limit the scope of the present disclosure for convenience of reading, and should be construed as equivalents of the present disclosure as long as the features are included and the effects are the same.

Equivalently, the components included in the "unit", "assembly", "mechanism" and "device" of the present disclosure can also be flexibly combined, i.e., can be produced in a modularized manner according to the actual situation, and can be assembled in a modularized manner as an independent module; the modules may be assembled separately, and one module may be configured in the present apparatus. The division of the above components in the present disclosure is only one of the embodiments, which is convenient for reading, and is not a limitation to the scope of protection of the present disclosure, as long as the above components are included and the function is the same, it should be understood that the technical solutions of the present disclosure are equivalent.

In the description of the present disclosure, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present disclosure and to simplify the description, but are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present disclosure.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include at least one of the feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.

In the present disclosure, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, releasably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship unless expressly stated otherwise. The specific meanings of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

In the present disclosure, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature in direct contact with the first or second feature, or the first and second features may be in indirect contact via intermediate media. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or may simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to," "disposed on," "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when one element is regarded as being fixedly connected with another element in a transmission manner, the two elements can be fixed in a detachable connection manner or in a non-detachable connection manner, and power transmission can be realized by the conventional technology, such as sleeving, clamping, integral forming and fixing, welding and the like, so that the problem is not complicated. When an element is perpendicular or nearly perpendicular to another element, it is desirable that the two elements are perpendicular, but certain vertical errors may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, however, as long as there is no such combination, the scope of the present description should be considered as being described in the present specification.

The above examples only express several embodiments of the present disclosure, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the inventive concept of the present disclosure, which falls within the scope of the present disclosure.

Claims

1. A battery pack, comprising:

a battery pack;

the first circuit board assembly is used for converting alternating current and direct current, and comprises a first circuit board and a first device electrically connected to the first circuit board, the first circuit board is electrically connected with the second circuit board, the working voltage of the first device is larger than that of the second device, and the first circuit board and the second circuit board are arranged at intervals along the thickness direction of the second circuit board.

2. The battery pack according to claim 1, wherein the second circuit board has an area larger than that of the first circuit board, the second circuit board includes a first region and a second region connected to each other, the first region is disposed opposite to the first circuit board to form a receiving space, at least one of the first devices and/or at least one of the second devices is located in the receiving space, the second region covers the battery pack, the first circuit board is electrically connected to the first region, and the first circuit board and the battery pack are arranged in a direction from the first region to the second region.

3. The battery pack of claim 2, wherein at least a portion of the second device is mounted to the second region.

4. The battery pack of claim 1, wherein the battery pack is spaced from at least some of the second device and/or the first device.

5. The battery pack of claim 1, further comprising a housing, a first charging portion and a first discharging portion, wherein the battery pack, the second circuit board assembly and the first circuit board assembly are mounted inside the housing, the first charging portion is electrically connected to the first circuit board and is at least partially exposed, and the first discharging portion is electrically connected to the second circuit board and is at least partially exposed.

6. The battery pack according to claim 5, wherein the case includes a first case, a second case, and a middle frame having a receiving portion; the first shell and the second shell are detachably connected to the middle frame; the first charging part and the first discharging part are disposed in the middle frame, and the battery pack, the second circuit board assembly and the first circuit board assembly are mounted in the accommodating part of the middle frame.

7. The battery pack of claim 6, further comprising a first clamping structure, wherein the first clamping structure comprises a first clamping protrusion and a first clamping groove, one of the first clamping protrusion and the first clamping groove is arranged on the side wall of the first shell, the other of the first clamping protrusion and the first clamping groove is arranged on the side wall of the second shell, and the first clamping protrusion and the first clamping groove are clamped and matched.

8. The battery pack of claim 7, wherein the first snap protrusion and the first snap groove are both located in the receiving portion of the middle frame; after the first clamping protrusion and the first clamping groove are clamped and matched, the middle frame is clamped and arranged between the first shell and the second shell.

9. The battery pack according to claim 8, wherein the inner side wall of the middle frame is provided with a limiting groove matched with the first clamping protrusion.

10. The battery pack of claim 6, wherein the middle frame has a first opening, the first charging portion is movably connected to the middle frame and has a first state and a second state, the first charging portion is received in the first opening when the first charging portion is in the first state, and at least a portion of the first charging portion protrudes out of the first opening when the first charging portion is in the second state.

11. The battery pack according to claim 10, further comprising a second clamping structure, wherein the second clamping structure comprises a second clamping protrusion and a second clamping groove, one of the second clamping protrusion and the second clamping groove is disposed on the first housing, the other of the second clamping protrusion and the second clamping groove is disposed on the second housing, and the second housing are clamped and matched through the second clamping protrusion and the second clamping groove;

12. The battery pack according to claim 6, wherein the first case has a first position-limiting portion, the middle frame has a second position-limiting portion, and the first position-limiting portion and the second position-limiting portion cooperate with each other to limit the first case to fit to the middle frame.

13. The battery pack according to claim 6, wherein a third positioning portion is provided on the middle frame, a fourth positioning portion is provided on the second casing, and the third positioning portion and the fourth positioning portion are matched with each other to fix the middle frame to the second casing.

14. The battery pack of claim 6, wherein the battery pack comprises a mounting bracket and a cell, the cell is mounted to the mounting bracket, and the second circuit board and/or the first circuit board is mounted to the mounting bracket; the mounting bracket is assembled to the middle frame.

15. The battery pack of claim 14, wherein the mounting bracket comprises first and second oppositely disposed mounting brackets, the second circuit board is mounted to the first and second mounting brackets, the cell comprises a positive terminal and a negative terminal, one of the positive terminal and the negative terminal is mounted to the first mounting bracket, and the other of the positive terminal and the negative terminal is mounted to the second mounting bracket.

16. The battery pack according to claim 5, further comprising a display device, wherein the display device is connected to the housing and exposed, the display device is electrically connected to the second circuit board and/or the first circuit board, and the display device is used for displaying operating parameters of the battery pack; and/or the battery pack further comprises a switch, the switch is electrically connected with the second circuit board and/or the first circuit board, and the switch is used for triggering the switching of the battery pack between an on state and an off state.

17. The battery pack of claim 16, wherein the switch is mounted to the housing and exposed, and the display device is mounted to the switch, the display device being spaced from the first circuit board assembly.

18. The battery pack of claim 6, further comprising a shielding member mounted to the housing or the first discharge portion, the shielding member shielding the first discharge portion.

19. The battery pack according to claim 18, wherein the first discharge portion includes a discharge channel, the shielding member is fixedly disposed in the discharge channel, and a deformation portion is disposed on the shielding member and is configured to automatically open and close the discharge channel.

20. The battery pack of claim 6, further comprising a second charging portion electrically connected to the second circuit board and at least partially exposed from the housing.

21. The battery pack of claim 20, further comprising a second and/or third discharge portion electrically connected to the second circuit board and at least partially exposed from the housing.

22. The battery pack of claim 21, wherein the second device further comprises a cell manager, and the cell manager is configured to convert an input voltage of the battery pack into a first target current and a second target current, the first target current and the second target current having different current values, the first target current being output from the first discharge portion, and the second target current being output from the second discharge portion and/or the third discharge portion.

23. The battery pack of claim 21, wherein the outer side of the middle frame comprises a first side, a second side, and a third side, the first side and the third side are opposite, the second side connects the first side and the third side, the first charging portion is located on the first side, the first discharging portion is located on the second side, the second discharging portion is at least partially located on the second side, and the second charging portion and the third discharging portion are located on the second side or the third side.

24. The battery pack of claim 1, wherein the second device comprises a temperature monitor electrically connected to the second circuit board and facing the battery pack, the temperature monitor for monitoring a temperature of the battery pack.

25. A power tool comprising the battery pack according to any one of claims 1 to 24.

26. A method of assembling a battery pack according to any one of claims 1 to 24, the method comprising at least the steps of:

s1: mounting the second circuit board assembly to the battery pack;

27. The assembling method according to claim 26, wherein said step S1 further includes: providing a mounting bracket and a battery cell, and mounting the battery cell on the mounting bracket; providing a first nickel sheet and a second nickel sheet, welding one end of the first nickel sheet to the positive end of the battery cell and the other end of the first nickel sheet to the second circuit board assembly, and welding one end of the second nickel sheet to the negative end of the battery cell and the other end of the second nickel sheet to the second circuit board assembly;